Publications by authors named "Hossein Molavi"

14 Publications

  • Page 1 of 1

FeO@PAA@UiO-66-NH magnetic nanocomposite for selective adsorption of Quercetin.

Chemosphere 2021 Feb 23;275:130087. Epub 2021 Feb 23.

Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada. Electronic address:

In the present study, a magnetic core-shell metal-organic framework (FeO@PAA@UiO-66-NH) nanocomposite was synthesized by a facile step-by-step self-assembly technique and used for selective adsorption of the anti-cancer Quercetin (QCT) drug. The synthesized nanocomposite was well characterized using FTIR, XRD, BET, FESEM, and TEM techniques. The adsorption kinetics and isotherms of the magnetic nanocomposites for QCT were investigated in detail at different initial concentrations and temperatures. It was found that the experimental adsorption kinetic and isotherm data were precisely explained by the pseudo-second-order kinetic and Langmuir isotherm models. Moreover, the selective adsorption ability of the synthesized nanocomposite against various drugs in the single, binary, and ternary solutions containing QCT, Curcumin (CUR), and Methotrexate (MTX) drugs was also studied. The synthesized adsorbent showed good adsorption selectivity for QCT against CUR and MTX. The adsorption mechanism of QCT on the nanocomposite might be related to the hydrogen bonding and hydrophobic-hydrophobic interactions via π-π stacking interactions between the benzene ring skeleton of QCT and the aromatic structure of the adsorbent nanoparticles. The regeneration and reusability studies demonstrated that the developed adsorbent sustained good structural stability and adequate adsorption capacity for QCT after ten consecutive adsorption-desorption cycles.
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http://dx.doi.org/10.1016/j.chemosphere.2021.130087DOI Listing
February 2021

Aluminum-based metal-organic frameworks for adsorptive removal of anti-cancer (methotrexate) drug from aqueous solutions.

J Environ Manage 2021 Jan 3;277:111448. Epub 2020 Nov 3.

School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada. Electronic address:

A series of metal-organic frameworks (MOFs) based on aluminum-benzene dicarboxylates (MIL-53, NH-MIL-53, and NH-MIL-101) at different ratios have been synthesized, and their adsorption performances for methotrexate (MTX), an anti-cancer drug, have been investigated in terms of adsorption kinetics, isotherms, solution pH, thermodynamics, mechanism, and recyclability. Maximum adsorption values of 374.97, 387.82, and 457.69 mg/g were observed for MIL-53, NH-MIL-53, and NH-MIL-101 , respectively. Our study shows that adsorption capacity of MTX depends not only on surface area and pore volume but also on the zeta potential and the presence of suitable functional groups. Higher adsorption of NH-MIL-101 observed for MTX than the other synthesized MOFs may be attributed to its large surface area, large total pore volume, high positive zeta potential, and polar amino functional groups located on its surface, which are responsible for its increased interactions with MTX molecules. Adsorption isotherms and kinetics of MTX onto NH-MIL-101 followed the Langmuir and pseudo-second-order kinetic equations. Thermodynamic data suggest that adsorption of MTX onto NH-MIL-101 is spontaneous and exothermic, while the adsorption mechanism is governed by electrostatic interactions, π-π stacking interactions, and H-bonding. Regeneration and recyclability of NH-MIL-101 were also investigated by washing with ethanol to observe its decreased adsorption performance towards MTX. It was slightly decreased after seven adsorption-desorption cycles, indicating excellent regeneration and good structural stability under the chosen experimental conditions.
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http://dx.doi.org/10.1016/j.jenvman.2020.111448DOI Listing
January 2021

Ethylenediamine-functionalized Zr-based MOF for efficient removal of heavy metal ions from water.

Chemosphere 2021 Feb 5;264(Pt 2):128466. Epub 2020 Oct 5.

School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada. Electronic address:

Ethylenediamine-functionalized Zr-based metal-organic framework (MOF, UiO-66-EDA) was prepared via Michael addition reaction to investigate its potential for adsorption of heavy metal ions from water. Specifically, the influence of agitation time, solution pH, the dosage of the adsorbent, initial metal ion concentration, temperature, and coexistence of other metal ions was investigated on the removal efficiency of UiO-66-EDA towards Pb(II), Cd(II), and Cu(II) metal ions. The pseudo-second-order kinetic model governed the adsorption of these ions onto the UiO-66-EDA. Langmuir isotherm model matched the experimental isotherm of adsorption with a maximum adsorption capacity of 243.90, 217.39, and 208.33 mg/g for Pb, Cd, and Cu ions, respectively. The adsorption of Pb, Cd, and Cu ions onto UiO-66-EDA was dependent on electron exchange, electron sharing, electrostatic and covalent interactions between the metal ions as well as the abundant functional groups on UiO-66-EDA surface. Thermodynamic parameters such as free energy changes (ΔG), standard enthalpy changes (ΔH), and standard entropy changes (ΔS) were calculated, which revealed spontaneous and endothermic nature of the adsorption process. The UiO-66-EDA was stable and recyclable during adsorption studies of Pb, Cd, and Cu ions, suggesting its potentiality as an adsorbent for heavy metals recovery.
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http://dx.doi.org/10.1016/j.chemosphere.2020.128466DOI Listing
February 2021

Impact of scale, activation solvents, and aged conditions on gas adsorption properties of UiO-66.

J Environ Manage 2020 Nov 14;274:111155. Epub 2020 Aug 14.

School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada. Electronic address:

This work reports on the potential application of UiO-66 in gas sweetening and its structural stability against water, air, dimethylformamide (DMF), and chloroform. The UiO-66 nanoparticles were solvothermally synthesized at different scales and activated via solvent exchange technique using chloroform, methanol, and ethanol. Thus prepared and aged MOFs were characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), and nitrogen adsorption-desorption analysis. The chloroform-activated MOF showed the largest surface area among all activation solvents, and presented high uptakes of 8.8 and 4.3 mmol/g for CO and CH, respectively, at 298 K and 30 bar. This might be due to removing all unreacted organic ligands and DMF molecules from the pores of the framework. The UiO-66 nanoparticles are stable at the experimental conditions with no significant loss in crystalline structure and gas adsorption ability even after aging under different conditions for one year. The UiO-66 could be easily regenerated at 373 K with no observed significant reduction in gas uptakes even after five consecutive adsorption-desorption cycles. The present findings suggest the excellent potential of the UiO-66-derived MOFs as the promising materials for CO/CH separation at low pressures and results can be applied in practical natural gas sweetening.
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http://dx.doi.org/10.1016/j.jenvman.2020.111155DOI Listing
November 2020

Ultrafast and simultaneous removal of anionic and cationic dyes by nanodiamond/UiO-66 hybrid nanocomposite.

Chemosphere 2020 May 16;247:125882. Epub 2020 Jan 16.

Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.

In this research, UiO-66 and its composite nanoparticles with thermally oxidized nanodiamond (OND) were synthesized via a simple solvothermal method and utilized as solid adsorbent for the removal of anionic methyl red (MR) dye and cationic malachite green (MG) dye from contaminated water. The synthesized adsorbents were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), N adsorption-desorption, and zeta potential analyzer. The influences of various factors such as initial concentrations of the dyes, adsorption process time, solution pH, solution temperature and ionic strength on adsorption behavior of MR dye onto OND-UiO hybrid nanoparticle were investigated. The adsorption of MR onto OND-UiO hybrid nanoparticle could be well described by Langmuir isotherm model. Meanwhile, pseudo-second order kinetic model was found to be suitable for illustration of adsorption kinetics of MR onto OND-UiO. Thermodynamic investigation suggested that the adsorption process was spontaneous and endothermic, and controlled by an entropy change instead of enthalpy effect. The experimental adsorption results indicated that OND-UiO hybrid nanoparticle could simultaneously adsorb 59% of MR and 43% of MG from the mixture of both dyes in only 2 min showing synergistic effect compared with single UiO-66 and OND nanoparticles in terms of adsorption rate and removal capacity of anionic dyes. The appropriate removal efficiency, rapid adsorption kinetic, high water stability, and good reusability make OND-UiO hybrid nanoparticle attractive candidate for simultaneously removal of both anionic MR and cationic MG dyes from wastewater.
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http://dx.doi.org/10.1016/j.chemosphere.2020.125882DOI Listing
May 2020

Amino-silane-grafted NH-MIL-53(Al)/polyethersulfone mixed matrix membranes for CO/CH separation.

Dalton Trans 2019 Sep;48(36):13555-13566

School of Engineering, University of British Columbia, Kelowna, BC, Canada V1 V 1 V7.

Mixed-matrix membranes (MMMs) are promising candidates for carbon dioxide separation. However, their application is limited due to improper dispersion of fillers within the polymer matrix, poor interaction of fillers with polymer chains, and formation of defects and micro-voids at the interface of both phases, which all result in the decline of the gas separation performance of MMMs. In this work, we present a new method to overcome these challenges. To this end, a series of MMMs based on polyethersulfone (PES) as the continuous polymer matrix and MIL-53-derived MOFs as the dispersed filler were prepared. FTIR-ATR, XRD, TGA, FESEM, and N2 adsorption/desorption analyses were employed to characterize the structural properties of the synthesized nanoparticles. The obtained results indicated that 3-aminopropyltriethoxysilane (APTES) molecules were successfully attached onto the surface of NH2-MIL-53(Al). Morphological characterization by FESEM and energy dispersive X-ray mapping (EDX) showed that desirable distribution within the whole membrane thickness, suitable nanoscale dispersion, and excellent interface were achieved by using amino-silane-grafted NH2-MIL-53(Al) (A-MIL-53(Al)) nanoparticles. The permeation results indicated that the permeability of two gases and the ideal CO2/CH4 selectivity enhanced by increasing the concentration of MOFs. In particular, comparing the experimental gas separation results of A-MMM-10 with those of pure PES membrane showed an 84% increase in the CO2 permeability and a 70% increase in CO2/CH4 selectivity. These results suggest that post-synthetic modification of MOF nanoparticles and strong interfacial adhesion between functionalized nanoparticles and polymer matrix could be a useful method to eliminate interfacial voids and improve gas separation efficiency.
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http://dx.doi.org/10.1039/c9dt02328cDOI Listing
September 2019

Mixed-Matrix Composite Membranes Based on UiO-66-Derived MOFs for CO Separation.

ACS Appl Mater Interfaces 2019 Mar 25;11(9):9448-9461. Epub 2019 Feb 25.

Institute for Nanoscience and Nanotechnology (INST) , Sharif University of Technology , P.O. Box 11155-8639, Tehran , Iran.

We demonstrated a novel mixed-matrix composite membrane (MMCM) based on acrylated polyurethane (APU) and UiO-66 nanoparticles to separate CO/N mixture. UiO-66 and functionalized UiO-66 including NH-UiO-66 and glycidyl methacrylate (GMA)-UiO-66 were loaded into APU/2-hydroxyethyl methacrylate (APUH) matrix at variable concentrations between 3 and 30 wt %. APUH/GMA-UiO-66 MMCMs exhibited strong adhesion with a support layer of polyester/polysulfone, which was not deteriorated after immersion in water for a long time (20 days). Incorporation of UiO-66 and its functionalized forms increased simultaneously permeability and CO/N selectivity, which were indeed superior in comparison with those of MMCMs reported previously. GMA-UiO-66-filled MMCM displayed a CO permeance of 14.5 Barrer and a CO/N selectivity of 53 at a critical concentration (25 wt %). This attractive separation performance of APUH/UiO-66 offered an exciting platform for the development of composite membranes for sustainable CO separations.
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http://dx.doi.org/10.1021/acsami.8b20869DOI Listing
March 2019

Prevalence of Chronic Constipation and Its Associated Factors in Pars Cohort Study: A Study of 9000 Adults in Southern Iran.

Middle East J Dig Dis 2018 Apr 15;10(2):75-83. Epub 2018 Mar 15.

Professor, Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran.

BACKGROUND Chronic constipation is one of the most common gastrointestinal disorders. It has negative effects on the patients' quality of life, and their productivity, and results in a high economic burden on the healthcare services. The aim of the present study was to estimate the prevalence of chronic constipation and its associated factors in pars cohort study (PCS). METHODS A cross-sectional study was conducted on the baseline data of the PCS. Data gathering was done by structured questionnaire and physical examination. A total of 9264 subjects aged between 40 and 75 years were enrolled in the PCS. Diagnosis of chronic constipation was done using Rome IV criteria. Multivariable binary logistic regression was applied for data analysis. RESULTS A total of 752 (8.1%) participants were diagnosed as having chronic constipation (9.3% of female and 6.7% of male participants). Older age (OR: 1.55, 95% CI: 1.31-1.83), physical activity (OR: 0.56, 95% CI: 0.46-0.68), opium consumption (OR: 2.06, 95% CI: 1.63-2.60) , anxiety (OR: 1.38, 95% CI: 1.15-1.65), depression (OR: 1.22, 95% CI: 1.01-1.48), back pain or arthralgia (OR: 1.38, 95% CI: 1.14-1.67), insomnia (OR: 1.62, 95% CI: 1.36-1.93) and gastroesophageal reflux disease (OR: 1.51, 95% CI: 1.28-1.78) were associated with the prevalence of constipation in the multivariable analysis. CONCLUSION Chronic constipation was a common problem in the PCS population. Decreasing modifiable risk factors associated with constipation such as opium consumption and physical inactivity can reduce its prevalence and decrease burden of the disease.
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http://dx.doi.org/10.15171/mejdd.2018.94DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6040930PMC
April 2018

Rapid and tunable selective adsorption of dyes using thermally oxidized nanodiamond.

J Colloid Interface Sci 2018 Aug 27;524:52-64. Epub 2018 Mar 27.

Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.

In the present study, capability of nanodiamond (ND) for the adsorption of anionic (methyl orange, MO) and cationic (methylene blue, MB) dyes from aqueous solution was investigated. Employing fourier transform infrared (FTIR) spectroscopy, Boehm titration method and zeta potential, it was found that the simple thermal oxidation of ND at 425 °C, increased the content of carboxylic acid of ND and accordingly the zeta potential of ND decreased considerably. Therefore, a series of oxidized NDs (OND) at various oxidation times and as-received untreated ND (UND) was used as adsorbents of MO and MB. The adsorption experiments exhibited that UND had large adsorption capacity, very fast adsorption kinetics and excellent selectivity for MO over MB. These results suggested that the adsorption tendency of UND toward anionic MO dye followed not only by electrostatic interactions but also via the chemical interaction caused by the strong hydrogen bond between the sulfonate groups of MO and the oxygen containing groups on the surface of UND. In contrast, ONDs exhibited higher adsorption capacity for cationic MB whose tendency toward MB increased by increasing the thermal oxidation time due to the promotion of the negative charge on the surface of OND leading to the higher electrostatic attraction. The adsorption rate of MB on ONDs was also very high. Kinetics data was well fitted with the pseudo- second-order model for most of the adsorbents. The adsorption selectivity analysis revealed that ONDs displayed more adsorption capacity for MB compared with MO which was also attributed to high electrostatic interactions of cationic dye with negative charges of ONDs. Finally, the release behavior of NDs was also demonstrated after soaking in ethanol and acetone.
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http://dx.doi.org/10.1016/j.jcis.2018.03.088DOI Listing
August 2018

Efficacy of life skills training on subjective well-being of students: a report from rafsanjan, iran.

Iran J Psychiatry Behav Sci 2014 ;8(2):63-7

Associate Professor, Department of Clinical Psychology, School of Psychologic and Education Science, Isfahan University, Isfahan, Iran.

Objective: The aim was to investigate the efficacy of life skills training on subjective well-being (SWB) among high school females.

Methods: The population study comprised all female high school of Rafsanjan, Iran, in 2008-2009. Thirty students with the lowest scores according to the Molavi's SWB questionnaire were considered eligible. At the next stage, the required sample of 30 students were selected randomly and divided into two groups of experimental (15 subjects) and control (15 subjects). Then, life skills training sessions were started for the experimental group (eight sessions in a 4-week period). Control group did not receive any intervention. The method of data processing at a descriptive level was through using central tendency indicators, dispersion, frequency, and percentage. Student's t-test was used for analysis of independent variables.

Results: The greatest R(2) (0.48) was observed for SWB. The R(2) coefficients for neurosis, stress-depression, vitality, and life determination were 0.27, 0.15, 0.20, and 0.09, respectively.

Conclusion: Life skills training showed the greatest effect regarding SWB of the students.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4105605PMC
July 2014

Psychometric properties of the Persian version of the screen for child anxiety-related emotional disorders (SCARED).

J Anxiety Disord 2013 Jun 25;27(5):469-74. Epub 2013 Jun 25.

Department of Psychology and Educational Sciences, University of Isfahan, Isfahan 81746-73441, Iran.

The present study examined the psychometric properties of the Persian translation of the Screen for Child Anxiety-Related Emotional Disorders-child version (SCARED-C) in a community sample of 557 children, aged 9-13 years, in the city of Isfahan, Iran. In addition to the SCARED-C, all the participants completed the Revised Children's Manifest Anxiety Scale (RCMAS) and the Children's Depression Inventory (CDI). The SCARED-C demonstrated moderate to high internal consistency (alpha=0.59-0.80) and good convergent and divergent validity. The one-factor and the five-factor model of the SCARED-C fitted the data moderately. However, the five-factor model had a significantly better fit than the one-factor model (Δχ(2)=287.346, df=10, P<.001). These findings showed that SCARED-C can be used as a reliable and valid measure of anxiety symptoms among children in Iran.
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http://dx.doi.org/10.1016/j.janxdis.2013.06.003DOI Listing
June 2013

Personality dimensions and type D personality in female patients with ulcerative colitis.

J Res Med Sci 2012 Oct;17(10):898-904

Department Psychology, College of Educational Science and Psychology, University of Isfahan, Isfahan, Iran.

Aim: Psychological factors such as personality traits may affect the adjustment capacity and Quality of Life (QOL) in Ulcerative Colitis (UC) patients. Type D personality has some similarities with general personality traits of UC patients. The aims of this study were to compare NEO personality profile and type D personality between healthy normal group and UC patients; and to determine the possible relationship between type D personality and QOL in UC patients.

Materials And Methods: The sample of study comprised of 58 UC patients and 59 healthy control subjects (from their family members). All participants were requested to fill out NEO-FFI, Type D personality (Ds14) Scale and WHO-Quality of Life Questionnaire.

Results: The findings indicated that UC patients scored higher in neuroticism (P<0/01); lower in extraversion (P<0/01) and openness (P<0/05) than healthy controls but their differentiation were not significant in agreeableness and conscientiousness. The findings showed that 59% of UC patients and 33% of the control subjects had type D personality; and the differences in frequency of type D between the two groups were significant (P<0/05). The mean QOL scores of type D personality in UC patients was significantly lower than patients without type D personality (F= 7/55, P<0/01). Type D personality could better predict QOL of UC patients than NEO dimensions.

Conclusions: Differences were observed between UC patients and their healthy family members, in terms of personality factors. Type D personality may be regarded as an important factor that may bring about some adverse effects in QOL among UC patients.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3698645PMC
October 2012

Cognitive impairments in patients with intractable temporal lobe epilepsy.

J Res Med Sci 2011 Nov;16(11):1466-72

Assistant Professor, Department of Psychology, School of Educational Sciences and Psychology, University of Isfahan, Isfahan, Iran.

Background: Cognitive impairment associated with temporal lobe epilepsy (TLE) has been recognized in multiple studies. We designed this study to find a specific cognitive profile in patients with TLE who were candidates for epilepsy surgery. We also sought to find if neuropsychological assessment could differentiate left TLE, right TLE and normal subjects.

Methods: The sample of this study consisted of 29 patients with right TLE, 31 with left TLE, and 32 subjects without history of seizure as the control group. For all recruited patients and controls, demographic questionnaire, Wechsler Memory Scale-III (WMS-III) and Wechsler Adult Intelligence Scale-R (WAIS-R) were administered. Multivariate analysis of variance was carried out to reveal differences in memory and intelligence performance between the three groups.

Results: All of the mean scores of the WMS-III indexes were significantly higher in the control group in comparison with the right or the left TLE groups (p < 0.001). There were not any significant differences between mean scores of WMS-III indexes of the right and the left. The WAIS-R also showed significantly better mean scores of full scale intelligence quotient (FSIQ) and performance intelligence quotient (PIQ) in the control groups than both of the right and left TLE patients (p < 0.001). Although the verbal intelligence quotient (VIQ) mean scores were significantly different between the left TLE and the control group (p = 0.037), there were not any significant differences between the right TLE patients and the control group.

Conclusions: These findings indicated that WMS-III and WAIS-R can differentiate patients with refractory temporal lobe epilepsy from normal subjects. However, the obtained cognitive profile could not differentiate between the right and the left TLE.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3430065PMC
November 2011

Metacognitive therapy for body dysmorphic disorder patients in Iran: acceptability and proof of concept.

J Behav Ther Exp Psychiatry 2012 Jun 4;43(2):724-9. Epub 2011 Oct 4.

University of Isfahan, Dept. of Psychology, Isfahan, Iran.

The purpose of the present study was to determine the effect of metacognitive therapy (MCT) on symptoms of body dysmorphic disorder (BDD) and on symptoms of thought-fusion, by means of a wait-list controlled clinical trial. Participants were referred from dermatology and cosmetic surgery clinics in the city of Isfahan, Iran, and 20 patients were selected on the basis of DSM-IV-TR diagnostic criteria for BDD. They were randomly assigned to either the experimental or the wait-list control group. The Yale-Brown Obsessive Compulsive Scale Modified for Body Dysmorphic Disorder (BDD-YBOCS) and the Thought-Fusion Inventory (TFI) were used as the outcome measures. The experimental group received 8 weekly metacognitive intervention sessions. The control group was in the waiting-list until the end of the follow-up. Measures were taken at pre-test, post-test (after 2 months) and follow-up (after 6-months). The results of analysis of variance showed that MCT significantly reduced the symptoms of BDD and of thought-fusion, compared to the wait-list. Effects on both outcome measures were maintained at 6-months follow-up.
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http://dx.doi.org/10.1016/j.jbtep.2011.09.013DOI Listing
June 2012