Publications by authors named "G Bharathi"

17 Publications

An efficient and magnetically recoverable g-CN/ZnS/CoFeO nanocomposite for sustainable photodegradation of organic dye under UV-visible light illumination.

Environ Res 2021 Jun 17;201:111429. Epub 2021 Jun 17.

Advanced Materials Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.

Effective improvement of an easily recoverable photocatalyst is equally vital to its photocatalytic performance from a practical application view. The magnetically recoverable process is one of the easiest ways, provided the photocatalyst is magnetically strong enough to respond to an external magnetic field. Herein, we prepared graphitic carbon nitride nanosheet (g-CN), and ZnS quantum dots (QDs) supported ferromagnetic CoFeO nanoparticles (NPs) as the gCN/ZnS/CoFeO nanohybrid photocatalyst by a wet-impregnation method. The loading of CoFeO NPs in the g-CN/ZnS nanohybrid resulted in extended visible light absorption. The ferromagnetic g-CN/ZnS/CoFeO nanohybrid exhibited better visible-light-active photocatalytic performance (97.11%) against methylene blue (MB) dye, and it was easily separable from the aqueous solution by an external bar magnet. The g-CN/ZnS/CoFeO nanohybrid displayed excellent photostability and reusability after five consecutive cycles. The favourable band alignment and availability of a large number of active sites affected the better charge separation and enhanced photocatalytic response. The role of active species involved in the degradation of MB dye during photocatalyst by g-CN/ZnS/CoFeO nanohybrid was also investigated. Overall, this study provides a facile method for design eco-friendly and promising g-CN/ZnS/CoFeO nanohybrid photocatalyst as applicable in the eco-friendly dye degradation process.
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http://dx.doi.org/10.1016/j.envres.2021.111429DOI Listing
June 2021

Visible light driven reduced graphene oxide supported ZnMgAl LTH/ZnO/g-CN nanohybrid photocatalyst with notable two-dimension formation for enhanced photocatalytic activity towards organic dye degradation.

Environ Res 2021 06 26;197:111079. Epub 2021 Mar 26.

Chemistry Department P. O. Box 84428, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia.

In this study, 2D/2D/2D heterostructured r-GO/LTH/ZnO/g-CN nanohybrid were synthesized through hydrothermal method. The strong electrostatic interaction between the negatively charged g-CN and r-GO nanosheets with positively charged layered triple hydroxide (LTH) nanosheets are effectively influences the successful formation of heterojunction. The LTH nanosheets are well spread on the g-CN nanosheets combined with r-GO. In particular, the as prepared heterojunction shows a better photocatalytic degradation activity compared to pristine samples and the significant enhancement in the photocatalytic performance is mainly accredited to the large interfacial charge transition of photogenerated charge carriers under the visible light irradiation. Although the 2D/2D/2D heterojunction effectively hinders the charge carrier recombination resulting high photocatalytic activity with good stability. In addition, the r-GO supported LTH/ZnO/g-CN heterojunction shows high photo-stability after sequential experimental runs with no obvious change in the dye degradation process. Consequently, the role of active species was investigated over the r-GO/LTH/ZnO/g-CN heterojunction with the help of different scavengers.
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http://dx.doi.org/10.1016/j.envres.2021.111079DOI Listing
June 2021

Rabies encephalitis in a preschool child following postexposure prophylaxis.

PLoS Negl Trop Dis 2021 02 18;15(2):e0009045. Epub 2021 Feb 18.

Department of Radiology, Kempegowda Institute of Medical Sciences, Bengaluru, Karnataka, India.

We report a case of rabies encephalitis in a 4½-year-old male child with an exposure to a suspect rabid dog. The child developed rabies 25 days after receiving postexposure prophylaxis. Rabies immunoglobulin (RIG) is currently administered according to body weight. In high-risk exposures over the head and neck, local administration of RIG over and above the body weight depending on the site, size, and severity of exposure may help to prevent rabies death. There is a need for further studies to generate new evidence in this regard.
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http://dx.doi.org/10.1371/journal.pntd.0009045DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7891780PMC
February 2021

Construction of magnetically recoverable ZnS-WO-CoFeO nanohybrid enriched photocatalyst for the degradation of MB dye under visible light irradiation.

Chemosphere 2021 Jun 19;273:129687. Epub 2021 Jan 19.

Department of Physics, Vellore Institute of Technology (Amaravati Campus), Amaravati, 522501, Guntur, Andhra Pradesh, India.

Easily recyclable photocatalysts have received considerable attention for their practical application, in order to address the wastewater treatments. Here, we report efficient and magnetically recyclable ZnS-WO-CoFeO nanohybrid prepared through wet impregnation method. The photophysical and optical properties of as-prepared photocatalysts was investigated by different spectroscopic techniques. The photocatalytic activity of as synthesized samples were assessed by the photodegradation of methylene blue (MB) dye under visible light irradiation. Amongst, ZnS-WO-CoFeO nanohybrid exhibit higher photodegradation activity than the other bare and hybrid samples. The enhanced light absorption and lower emission intensity provide the improved photocatalytic activity of ZnS-WO-CoFeO nanohybrid. The ZnS-WO-CoFeO nanohybrid exhibit excellent photostability after four consecutive cycles. The ferromagnetic behavior of the hybrid sample using easily recover from the dye solution using an external bar magnet.
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http://dx.doi.org/10.1016/j.chemosphere.2021.129687DOI Listing
June 2021

An all-graphene quantum dot Förster resonance energy transfer (FRET) probe for ratiometric detection of HE4 ovarian cancer biomarker.

Colloids Surf B Biointerfaces 2021 Feb 12;198:111458. Epub 2020 Nov 12.

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. Electronic address:

Ovarian cancer (OVC), the most lethal form of all gynecological cancers, is a big threat to women's health. Late diagnosis at the advanced stages is one of the major reasons for the ovarian cancer-related deaths. Conventionally, the up-regulated proteins CA125 (cancer antigen 125) and HE4 (human epididymis protein 4) are used as biomarkers to diagnose the OVC malignancies. The lack of sensitivity/specificity and the false-positive results create complexity in the diagnostic process. With specificity over 90 %, HE4 is suitable for diagnosing ovarian cancer. Herein, we have developed an ultrasensitive all-graphene quantum dot (GQD) Förster resonance energy transfer (FRET) probe for the ratiometric detection of HE4 biomarker. A set of two GQD samples were solvothermally prepared and then analyzed by the morphological, structural, and photophysical characterization. One GQD sample exhibited a strong green emission, peaked at around 515 nm, while the other GQD sample displayed a strong red emission with maximum at around 615 nm. The good spectral overlap between the emission and excitation spectra of the green and red GQDs, respectively, all allowed us to consider them for the design of FRET-based probe. The green and red-emitting GQDs were conjugated with HE4 antibody and used as donor and acceptor, respectively for the ratiometric sensing of HE4 ovarian cancer biomarker. The all GQD FRET probe was able to detect as low as 4.8 pM, along with a large dynamic detection range up to 300 nM. The selectivity and interference effect of the developed FRET probe was also investigated against different protein combinations.
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http://dx.doi.org/10.1016/j.colsurfb.2020.111458DOI Listing
February 2021
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