Publications by authors named "Kuanjun Fang"

18 Publications

  • Page 1 of 1

Hierarchical BiMoO microsphere photocatalysts modified with polypyrrole conjugated polymer for efficient decontamination of organic pollutants.

Chemosphere 2021 Jul 15;286(Pt 1):131541. Epub 2021 Jul 15.

College of Textiles & Clothing, Qingdao University, Qingdao, 266071, PR China; Collaborative Innovation Center for Eco-Textiles of Shandong Province, Qingdao, 266071, PR China.

To effectively degrade organic pollutants in wastewater, visible-light-driven BiMoO/PPy hierarchical heterogeneous photocatalysts were prepared through a solvothermal method and the following in-situ chemical oxidation polymerization. Compared with pristine BiMoO photocatalyst, the composite photocatalysts exhibited dramatically improved photocatalytic activity and photostability towards the degradation of methylene blue dye and tetracycline antibiotic. BiMoO/PPy-80 sample achieved the highest photocatalytic degradation rates for methylene blue dye (93.6%) and tetracycline antibiotic (88.3%) under visible light irradiation. These two organic pollutants could be completely degraded into nontoxic small molecules according to in-depth HPLC-MS analysis of degradation products. The transient photocurrent responses, electrochemical impedance spectra, and photoluminescence spectra demonstrated that the introduction of PPy nanoparticles on the surface of BiMoO nanosheets could effectively accelerate the separation of photo-generated electron-hole pairs. Furthermore, a possible synergetic photocatalytic mechanism was put forward based on the electron spin resonance and XPS valence-band spectra. This work indicated that construction of hierarchical composite photocatalysts combining polypyrrole conductive polymer and BiMoO semiconductor in nanoscale is an efficient approach to improve photocatalytic activity for environmental remediation.
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http://dx.doi.org/10.1016/j.chemosphere.2021.131541DOI Listing
July 2021

Effect of Diethylene Glycol on the Inkjet Printability of Reactive Dye Solution for Cotton Fabrics.

Langmuir 2021 Feb 19;37(4):1493-1500. Epub 2021 Jan 19.

College of Textiles & Clothing, State Key Laboratory for Bio-fibers and Eco-textiles, Collaborative Innovation Center for Eco-textiles of Shandong Province, 308 Ningxia Road, Qingdao 266071, China.

Digital inkjet printing technology plays an increasingly important role in textile printing. The printing printability of reactive dye inks is the key to improving the quality of printed fabrics. In this study, an eco-friendly and simple method to improve the inkjet printability of reactive dye solutions was proposed. The influence of diethylene glycol on the surface tension, rheology, and dye molecule aggregation properties for three reactive dye solutions was investigated. The jetting performance of dye solutions was explored by observing droplet formation. Moreover, the color performance of printed cotton fabrics, including reactive dye solution penetration, colorimetric values, and color strength, was evaluated. Addition of diethylene glycol could change the aggregation of dye molecules by hydrophobic forces and hydrogen bonds. Diethylene glycol could inhibit formation of satellite droplets by changing the viscosity and surface tension of solutions, which made the pattern printed on cotton fabrics show regular edge sharpness. Furthermore, the dye solutions containing 10% DEG not only satisfied various properties of reactive dye inks but also had the highest color strength and the deepest and brightest colors.
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http://dx.doi.org/10.1021/acs.langmuir.0c03016DOI Listing
February 2021

Synergistic Effects of Alpha Olefin Sulfonate and Sodium Alginate on Inkjet Printing of Cotton/Polyamide Fabrics.

Langmuir 2021 Jan 6;37(2):683-692. Epub 2021 Jan 6.

School of Textile Science and Engineering, Tiangong University, 399 Binshui West Road, Tianjin 300387, China.

Bicomponent or multicomponent fiber fabrics are important materials for manufacturing high-performance textiles. However, the printing and dyeing of these fabrics are very difficult because the dyeability of different fibers varies greatly. The present study investigated the inkjet printing performance of interwoven fabrics of cotton and polyamide 6. The surfactant alpha olefin sulfonate (AOS) was incorporated into the sodium alginate (SA) solution to pretreat the fabrics to improve the color effects of printed fabrics. The results indicate that fabric pretreatment using 5% alpha olefin sulfonate and 2% sodium alginate significantly enhanced the image colors through increasing the hydrophilicity of the film formed on polyamide fibers and changing the surface morphology of both the fibers. The molecules of AOS interacted with the macromolecules of SA to form the composite films, where the AOS concentration gradient increased outward and SA concentration gradient increased inward. The synergistic pretreatment of alpha olefin sulfonate and sodium alginate endowed the fabrics with high inkjet printing performance, satisfactory color fastnesses, and durability.
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http://dx.doi.org/10.1021/acs.langmuir.0c02723DOI Listing
January 2021

Green and Efficient Inkjet Printing of Cotton Fabrics Using Reactive [email protected] Nanospheres.

ACS Appl Mater Interfaces 2020 Oct 23;12(40):45281-45295. Epub 2020 Sep 23.

State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.

Digital inkjet printing of textiles possesses great advantages like high efficiency and flexible production, but the challenges like the risk of causing serious environmental problems due to the large usage of dyes and chemicals still remain a matter of concern. In response to this problem, herein, a novel kind of reactive [email protected] nanosphere was prepared through the adsorption of C. I. Reactive Red 218 dyes (RR218) onto cationic poly(styrene-butyl acrylate-vinylbenzyl trimethylammonium chloride) (PSBV) nanospheres and applied in inkjet printing on woven cotton fabric. Results show that the prepared [email protected] nanospheres possessed homogeneous size and good stability for ink preparation. In comparison with the original RR218 solution, the color depth of [email protected] fabric increased by 1.4 times and the dye residues in the printing effluent were reduced by about 45%. Meanwhile, the consumptions of sodium carbonate and urea in conventional inkjet printing were reduced by about 3.3 and 22.8 mg/cm, respectively, and the printing process was simplified with 30% energy saving. Furthermore, the mechanism of the color enhancement by nanospheres was revealed by the calculation of absorption and scattering coefficients based on the Kubelka-Munk function. This work provides a potential application of [email protected] nanospheres to promote the optimization of the textile inkjet printing technique and alleviates the environmental impact of conventional textile coloration.
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http://dx.doi.org/10.1021/acsami.0c12899DOI Listing
October 2020

Rheological properties of carboxymethyl hydroxypropyl cellulose and its application in high quality reactive dye inkjet printing on wool fabrics.

Int J Biol Macromol 2020 Dec 1;164:4173-4182. Epub 2020 Sep 1.

School of Textile Science and Engineering, Tiangong University, 399 Binshui West Road, Tianjin 300387, China.

In this paper, the effect of rheological properties of pretreatment solutions, using carboxymethyl hydroxypropyl cellulose (CMHPC), sodium carboxymethyl cellulose (CMC), and sodium alginate (SA) as thickeners, on inkjet printing performance of wool with reactive dye inks was examined. Rheological, FESEM, and thickness results showed that fabrics treated with CMHPC solution, which exhibited superior fluidity, dominant elasticity property, and the largest zero-shear viscosity, produced the most continuous films and the lowest fabric thickness. Optical microscopy and XPS analyses confirmed that when compared with SA and CMC treated fabrics, CMHPC treated fabric controlled the excessive spread and penetration of ink droplets at higher effectiveness and produced the highest color strength (K/S value) and sharpest edge. In contrast to this, SA solution exhibited the worst fluidity, the most obvious viscous behavior, and lowest zero-shear viscosity. This resulted in the most discontinuous film, highest fabric thickness, and worst printing performance. Furthermore, wettability analysis demonstrated that the film structure dependent on the rheological property was the main factor that affected the inkjet printing performance of wool fabrics. CMHPC treatment of wool fabric provides an environment-friendly method with lower CMHPC concentration, less urea consumption, and shorter steaming time for higher K/S value.
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http://dx.doi.org/10.1016/j.ijbiomac.2020.08.216DOI Listing
December 2020

Effects of Viscosity and Surface Tension of a Reactive Dye Ink on Droplet Formation.

Langmuir 2020 Aug 4;36(32):9481-9488. Epub 2020 Aug 4.

College of Textiles & Clothing, Qingdao University, 308 Ningxia Road Qingdao 266071, China.

In textile inkjet printing, understanding the effect of viscosity and surface tension of a reactive dye ink on droplet formation is of great significance. As an organic ecofriendly solvent, polyethylene glycol with a molecular weight of -400 g/mol (PEG400) was used to prepare reactive dye inks with or without Surfynol 465 (S465) to explain separately how viscosity and surface tension affect the droplet formation of a reactive dye ink. The intermolecular interactions in the ink and physical properties of the ink were investigated by measuring the visible absorption spectra, hydrodynamic radius, viscosity, and surface tension. Droplet formation under a single variable influence of viscosity or surface tension was observed by taking photographs using a high-speed camera. Results show that a high ink viscosity condition generates no satellite droplet formation and a slower droplet velocity, and a higher surface tension tends to cause ligament rupture from the nozzle tip and the droplet. Moreover, a twill cotton fabric printed using the PEG-S465-dye ink at a 30% PEG400 concentration showed higher ink penetration, dye fixation rate, ideal color strength, and rubbing fastness.
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http://dx.doi.org/10.1021/acs.langmuir.0c01392DOI Listing
August 2020

Interaction of Reactive-Dye Chromophores and DEG on Ink-Jet Printing Performance.

Molecules 2020 May 28;25(11). Epub 2020 May 28.

College of Textiles & Clothing, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.

Digital inkjet printing has been widely used in textile industry. The quality of dye solutions and ink-jet droplets limits the ink-jet printing performance, which is very important for obtaining high-quality ink-jet printing images on fabrics. In this paper, we introduced diethylene glycol (DEG) into the dye solutions of Reactive Blue 49 and Reactive Orange 13, respectively, and investigated the interaction between dye chromophores and DEG molecules. Results indicated that the dye chromophores were featured in the aggregation. Adding DEG into the dye solution could effectively disaggregate clusters of reactive dyes, and eliminate satellite ink droplets, thus improving the resolution of the ink-jet printing image on fabrics. Under the same DEG concentration, the disaggregation effect was more obvious in Orange 13 than in Reactive Blue 49. Higher DEG concentration was required in Reactive Orange 13 solution for creating complete and stable ink drops. The surface tension and viscosity of the dye solutions were measured, and printing performance on cotton fabrics was evaluated. The interaction mechanism between dye chromophores and DEG molecules was also investigated. Results from this work are useful for high-quality ink-jet printing images on fabrics.
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http://dx.doi.org/10.3390/molecules25112507DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321201PMC
May 2020

Systematically Exploring Molecular Aggregation and Its Impact on Surface Tension and Viscosity in High Concentration Solutions.

Molecules 2020 Mar 30;25(7). Epub 2020 Mar 30.

College of Textiles & Clothing, State Key Laboratory for Biofibers and Eco-textiles, Collaborative Innovation Center for Eco-textiles of Shandong Province, Qingdao University, Qingdao 266071, China.

The aggregation structure of dye molecules has a great influence on the properties of dye solutions, especially in high concentration. Here, the dye molecular aggregation structures were investigated systemically in aqueous solutions with high concentration using three reactive dyes (O-13, R-24:1 and R-218). O-13 showed stronger aggregation than R-24:1 and R-218. This is because of the small non-conjugate side chain and its β-linked position on the naphthalene of O-13. Compared with R-218, R-24:1 showed relatively weaker aggregation due to the good solution of R-24:1. The change of different aggregate distributions in the solutions were also investigated by splitting the absorption curves. Moreover, it is found that the surface tension of solutions can be modified by the combined effect of both aggregation and the position of the hydrophilic group, which, however, also have an effect on viscosity. This exploration will provide guidance for the study of high concentration solutions.
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http://dx.doi.org/10.3390/molecules25071588DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7180489PMC
March 2020

Protease and sodium alginate combined treatment of wool fabric for enhancing inkjet printing performance of reactive dyes.

Int J Biol Macromol 2020 Mar 11;146:959-964. Epub 2019 Nov 11.

College of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.

Usually, it is difficult to achieve high performance images on original wool fabrics due to the presence of scales on the fiber surfaces. Herein, we developed a novel and environmental combined process with a protease enzyme and sodium alginate for wool fabric inkjet printing using reactive dyes. The results indicate that the protease and SA combined treatment of wool fabrics produced high color performance of printed fabrics with the deepest, brightest and finest color effect. FESEM, XPS and wettability analysis reveal that most of the wool scales were eliminated by the protease and the SA formed uniform and compact films on the newly created fiber surfaces with more hydrophilicity of 70.1° contact angle and 3.5 s wetting time. The protease-SA treated wool fabrics exhibit satisfactory washing and rubbing fastness and acceptable strengths. This process has the advantages of zero AOX emission, low strength loss and satisfactory color fastness.
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http://dx.doi.org/10.1016/j.ijbiomac.2019.09.220DOI Listing
March 2020

Investigating the synergetic dispersing effect of hydrolyzed biomacromolecule Cellulase and SDS on CuPc pigment.

Colloids Surf B Biointerfaces 2019 Dec 10;184:110568. Epub 2019 Oct 10.

Textile and Garment College, Chemical Engineering College of Qingdao University, Qingdao 266071, China; Collaborative Innovation Center for Eco-Textiles of Shandong Province, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao 266071, China. Electronic address:

In this paper, the dispersion performance of biomacromolecule hydrolyzed cellulase from Trichoderma reesei on copper phthalocyanine (CuPc) pigment was first studied. The effect of hydrolysis time, cellulase concentration and environmental pH on the dispersion performance was investigated by particle size distribution and suspension transmittance measurement. The hydrolysis degree of cellulase was determined by FTIR, XRD, UV-vis and fluorescence spectra, potential and particle size analysis, respectively. Subsequently, the hydrolyzed cellulase was combined with sodium dodecyl sulfate (SDS) for acquiring better CuPc suspension based on their synergetic effects on dispersion. The optimal mass ratio of hydrolyzed cellulase to SDS was found to be 1:9. The resulting CuPc dispersion by this hydrolyzed cellulase/SDS composite was characterized by FTIR, TG, TEM, XRD analysis, respectively. This study demonstrated that there were strong interactions between hydrolyzed cellulase and SDS to result in synergistic dispersing effect on CuPc for better stability.
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http://dx.doi.org/10.1016/j.colsurfb.2019.110568DOI Listing
December 2019

High-Quality Images Inkjetted on Different Woven Cotton Fabrics Cationized with P(St-BA-VBT) Copolymer Nanospheres.

ACS Appl Mater Interfaces 2019 Aug 31;11(32):29218-29230. Epub 2019 Jul 31.

School of Textiles Science and Engineering , Tianjin Polytechnic University , No. 399 Binshui Xi Road , Xiqing District, Tianjin 300387 , P. R. China.

The porosity, roughness, and thickness of woven fabrics limit inkjet printing quality, which is extremely important for obtaining high-quality inkjet printing images on fabrics. This study reveals the application of poly[styrene-butyl acrylate-(P-vinylbenzyl trimethyl ammonium chloride)] nanospheres prepared via a soap-free emulsion polymerization approach as a novel kind of the cationization modifier for the inkjet printing of different woven cotton fabrics by the pad-cure process. It was found that the nanospheres exhibited an average diameter of 65.5 nm, a zeta potential of +57.8 mV, and a glass transition temperature of 94.7 °C. The nanospheres deposited on three cotton fabrics through the dip-rolling process, resulting in the increase of zeta potential, hydrophobicity and thickness of the fabric, and the decrease of porosity and roughness. The high-quality inkjet printing images can be obtained on fabrics with different structures owing to the differences in zeta potential, hydrophobicity, porosity, roughness, and thickness of fabrics. The plain, twill, and honeycomb weave fabrics obtained high-quality inkjet printing images for portraits, oil paintings, and landscape paintings, respectively. The nanospheres could strongly adsorb on the fiber by electrostatic attraction. The reactive dye molecules in the inks could react with the cationized fibers by electrostatic attractive force, resulting in the increase of the color strength, fixation rates, and outline sharpness. The nanosphere cationization of different woven fabrics offers a new potential method for obtaining high-quality patterns without significantly affecting the fabric handle.
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http://dx.doi.org/10.1021/acsami.9b07848DOI Listing
August 2019

Jetting Performance of Polyethylene Glycol and Reactive Dye Solutions.

Polymers (Basel) 2019 Apr 24;11(4). Epub 2019 Apr 24.

Fiber Materials and Modern Textiles of the Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.

The jetting performance of dye inks determines the image quality, production efficiency, and lifetime of the print head. In the present study, we explored the jetting performance of mixed solutions of polyethylene glycol (PEG) and reactive dye by testing the visible absorption spectra, rheological properties, and surface tension, in addition to the observation of droplet formation. The results indicate that PEG macromolecules could change the aggregate groups of Red 218 molecules into smaller ones through hydrophobic interactions and separation effect. The addition of PEG into the dye solution increased the viscosity and decreased the surface tension. In the whole shear rate range tested, the 10% and 20% PEG400, as well as the 30% PEG200 dye solutions, showed good Newtonian fluid behavior. PEG macromolecules improved the droplet formation of the dye solutions. Increasing the PEG400 concentration to 30% and 40% resulted in elimination of the formation of satellites and the formation of ideal droplets at 10,000 Hz jetting frequency. A 30% PEG600-dye solution with the value of 4.6 formed the best spherical droplets at 10,000 Hz and produced perfect color images on cotton fabrics.
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http://dx.doi.org/10.3390/polym11040739DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6523127PMC
April 2019

Reactive Pad-Steam Dyeing of Cotton Fabric Modified with Cationic P(St-BA-VBT) Nanospheres.

Polymers (Basel) 2018 May 23;10(6). Epub 2018 May 23.

School of Textiles, Tianjin Polytechnic University, No. 399 Binshui Xi Road, Xiqing District, Tianjin 300387, China.

The Poly[Styrene-Butyl acrylate-(P-vinylbenzyl trimethyl ammonium chloride)] P(St-BA-VBT) nanospheres with N⁺(CH₃)₃ functional groups were successfully prepared and applied to modify cotton fabrics using a pad-dry process. The obtained cationic cotton fabrics were dyed with pad-steam dyeing with reactive dye. The results show that the appropriate concentration of nanospheres was 4 g/L. The sodium carbonate of 25 g/L and steaming time of 3 min were suitable for dyeing cationic cotton with 25 g/L of C.I. Reactive Blue 222. The color strength and dye fixation rates of dyed cationic cotton fabrics increased by 39.4% and 14.3% compared with untreated fabrics. Moreover, sodium carbonate and steaming time were reduced by 37.5% and 40%, respectively. The rubbing and washing fastness of dyed fabrics were equal or higher 3 and 4⁻5 grades, respectively. Scanning electron microscopy (SEM) images revealed that the P(St-BA-VBT) nanospheres randomly distributed and did not form a continuous film on the cationic cotton fiber surfaces. The X-ray photoelectron spectroscopy (XPS) analysis further demonstrated the presence of cationic nanospheres on the fiber surfaces. The cationic modification did not affect the breaking strength of cotton fabrics.
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http://dx.doi.org/10.3390/polym10060564DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6404073PMC
May 2018

Inkjet Printable and Self-Curable Disperse Dyes/P(St-BA-MAA) Nanosphere Inks for Both Hydrophilic and Hydrophobic Fabrics.

Polymers (Basel) 2018 Dec 18;10(12). Epub 2018 Dec 18.

Fiber Materials and Modern Textiles of the Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.

Low-water-soluble disperse dyes possess a broad color gamut and good durability, but they need chemical or physical modification before being used in inks and can only be applied to several kinds of hydrophobic fabrics. In this work, disperse dyes/P(St-BA-MAA) nanospheres (known as DPN) absorbed by sodium nitrilotriacetate (known as [email protected]) were prepared and applied into ink formulations, which exhibited high dye fixation, long-term stability and self-curable ability without addition of any binder. Transmission electron microscopy (TEM) images showed the nanospheres have homogeneous core-shell spherical shape and the average diameter increased by 20.6 nm after coloration. X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), and differential scanning calorimetry (DSC) measurements illustrated the interaction between dyes and nanospheres and indicated that the colored nanospheres contained both dye molecules and crystalline dyes. The Zeta potential and particle size measurements demonstrated that the dispersion stability was improved when sodium nitrilotriacetate (NTA) was absorbed onto DPN. The rheological behavior of the [email protected] inks was Newtonian and desired droplet formation was achieved at the viscosity of 4.23 mPa·s. Both hydrophilic cotton and hydrophobic polyester fabrics were cationic modified before used, which had an excellent image quality and desired rubbing fastness after inkjet printing. Scanning electron microscope (SEM) images showed [email protected] formed stable deposits on the surface of modified fibers and could self-cure to form continuous film coating on the fiber surface after being baked at 150 °C without addition of any binder.
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http://dx.doi.org/10.3390/polym10121402DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401999PMC
December 2018

Effect of Cotton Cationization Using Copolymer Nanospheres on Ink-Jet Printing of Different Fabrics.

Polymers (Basel) 2018 Nov 2;10(11). Epub 2018 Nov 2.

School of Textiles, Tianjin Polytechnic University, No. 399 Binshui Xi Road, Xiqing District, Tianjin 300387, China.

In this study, the cationic Poly[Styrene-Butyl acrylate-(P-vinylbenzyl trimethyl ammonium chloride)] P(St-BA-VBT) nanospheres with N⁺(CH₃)₃ functional groups were successfully synthesized by soap-free emulsion polymerization and applied to different fabrics by pad-cure process. After the pad-cure process, the nanospheres were deposited on the surface of the modified cotton fibers successfully without forming a continuous film structure. The X-ray Photoelectron Spectroscopy (XPS) and the Fourier transform infrared (FTIR) results demonstrated that P(St-BA-VBT) nanospheres were adsorbed on the surface of cotton fibers successfully. The excellent color strength value and outline sharpness of the plain, twill, and honeycomb fabrics can be achieved when the nanosphere concentration, sodium bicarbonate, and steaming time were 1 g/L, 10 g/L, and 6 min, respectively. The plain fabrics exhibited the smallest color strength (/) values and the best outline sharpness, followed by twill and honeycomb fabrics, which displayed the largest / values and the worst outline sharpness after the same treatment. Besides, all the three fabrics showed excellent rubbing fastness and washing fastness. The cationic P(St-BA-VBT) nanospheres modification of the cotton fabrics provides a novel potential approach to obtain good printing efficiency without affecting the tensile breaking strength of cotton fabrics significantly.
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http://dx.doi.org/10.3390/polym10111219DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6290600PMC
November 2018

Removing the residual cellulase by graphene oxide to recycle the bio-polishing effluent for dyeing cotton fabrics.

J Environ Manage 2018 Feb 28;207:423-431. Epub 2017 Nov 28.

Textile and Chemical Engineering College of Qingdao University, Qingdao 266071, China; The Growing Base for State Key Laboratory of Fiber Materials and Modern Textiles, Collaborative Innovation Center for Ecological Textile of Shandong Province, Qingdao 266071, China. Electronic address:

In this research, a stable graphene oxide (GO) suspension was prepared by chemical reduction method from graphite powder. By TEM, the irregular GO sheets with single-atom-layered structure could be observed. The zeta potentials measurement indicated the surface charges of GO were strongly related to pH. BET analysis showed the GO had a specific surface area of 30.7 m/g and pore volume of 0.10 cm/g. When the GO was used to remove the residual cellulase in bio-polishing effluent, it was found the removal capacity reached its maximum value at the pH 4-5. The kinetics studies showed that the removal process of cellulase followed a pseudo-second-order kinetic model with a rate constant (k) of 0.276 × 10 g/mg min and equilibrium adsorption capacity of 278.55 mg/g, respectively. By plotting the adsorption isotherms, it was found the Langmuir model fitted the experimental data well with a cellulase adsorption capacity of 574.71 mg/g, indicating the adsorption of cellulase by GO in a monolayer manner. When dyeing the cotton fabrics with reactive dyes, it was found that the cotton fabrics could acquire similar color properties in the recycled bio-polishing effluent as in fresh water, meaning the effectiveness of removing cellulase by GO and the feasibility of recycling the bio-polishing effluent.
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http://dx.doi.org/10.1016/j.jenvman.2017.11.056DOI Listing
February 2018

The synchronized wash-off of reactive-dyed cotton fabrics and decolorization of resultant wastewater using titanium dioxide nano-fibers.

Carbohydr Polym 2015 Jul 7;125:367-75. Epub 2015 Mar 7.

Sunvim Group Co., Ltd., Gaomi 261500, China.

In this research, titanium dioxide (TiO2) nano-fibers with a well-organized anatase structure were synthesized by a hydrothermal method. Their structural properties were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and transmission electron microscope (TEM) analysis, respectively. Subsequently, the TiO2 nano-fibers were optically excited under the ultraviolet (UV) irradiation to decolorize the reactive dye solution. The influences of initial pH, concentrations of reactive dye and TiO2 nano-fibers as well as irradiation time on rate of photocatalytic decolorization were investigated. Based on their excellent photocatalytic performance, a novel method for achieving the synchronized wash-off of reactive-dyed cotton and decolorization of resultant wastewater was developed. It was found that the wash fastness of reactive-dyed cotton after TiO2-based wash-off was equal to that after standard way. The influences of TiO2-based wash-off on the properties of cotton substrates were determined by Fourier transform infrared spectroscopy (FTIR), XRD, and scanning electron microscope (SEM) analysis, respectively, which indicated that this new synchronized method would exert few damages to the cotton substrate.
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http://dx.doi.org/10.1016/j.carbpol.2015.02.065DOI Listing
July 2015

Ultrasonic effect on the desizing efficiency of α-amylase on starch-sized cotton fabrics.

Carbohydr Polym 2013 Jul 12;96(2):474-80. Epub 2013 Apr 12.

Chemistry and Environment College of Qingdao University, Qingdao 266071, China.

Enzymatic desizing by α-amylase and ultrasound irradiation are the two important clean technologies in the textile industry. In the present work, with the aim of giving a further insight to the influence of ultrasound on α-amylase activity and its desizing efficiency, the ultrasound-based experiments were afforded in two ways: (i) step-wise treatment of α-amylase by ultrasound and then enzymatic desizing, as well as; (ii) simultaneous utilization of ultrasound and α-amylase for the desizing. By the step-wise strategy, it is found that the ultrasound has negative impact on the α-amylase activity using soluble starch as substrate. However, the sonicated α-amylase possesses higher desizing efficiency because there are higher hydrophobic interactions between sonicated α-amylase protein and starch-sized cotton and thus intensifies its catalytic activity. By the simultaneous procedure, the enhancement to desizing efficiency is more pronounced than that by the step-wise procedure. This can be attributed to comprehensive actions of several reasons such as more effective stirring/mixing mechanism, damages or changes to substrate, more effective catalysis to hydrolytic reactions and faster removal of loosened products from the fabric bulk.
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http://dx.doi.org/10.1016/j.carbpol.2013.04.003DOI Listing
July 2013
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