Papers by Dr. Basudev Baral
Frontiers in Chemistry, Jan 21, 2024
ACS omega, Mar 9, 2020
To surmount incompatibility provoked efficiency suppression of an anisotype heterojunction and to... more To surmount incompatibility provoked efficiency suppression of an anisotype heterojunction and to pursue an improved intrinsic photocatalytic activity by manipulating oriented transfer of photoinduced charge carriers, an In 2 S 3 /BiVO 4 (1:1) n−n isotype heterojunction was fabricated successfully through a simple twostep calcination method, followed by a wet-chemical deposition method. The formation of an n−n isotype heterojunction was confirmed by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV− visible diffuse reflectance spectroscopy. The photocatalytic efficiency of the In 2 S 3 / BiVO 4 catalyst was examined over degradation of oxytetracycline hydrochloride (O-TCH) and oxygen (O 2) evolution reaction. Consequently, an n−n In 2 S 3 /BiVO 4 isotype heterojunction exhibits a superior O-TCH degradation efficiency (94.6%, 120 min) and O 2 evolution (695.76 μmol, 120 min) of multiple folds as compared to the pure BiVO 4 and In 2 S 3 solely. This is attributed to the proper band alignment and intimate interfacial interaction promoted charge carrier separation over the n−n isotype heterojunction. The intimate interfacial contact was confirmed by transmission electron microscopy (TEM), high-resolution TEM, and field emission scanning electron microscopy analysis. The proper band alignment was confirmed by Mott−Schottky analysis. The photoelectrochemical linear sweep voltammetric study shows a superior photocurrent density (269 μA/cm 2) for In 2 S 3 / BiVO 4 as compared to those for pristine BiVO 4 and In 2 S 3 , which is in good agreement with the photocatalytic results. Furthermore, the superior charge antirecombination efficiency of the n−n isotype heterojunction was established by photoluminescence, electrochemical impedance spectroscopy, Bode analysis, transient photocurrent, and carrier density analysis. The improved photostability of the heterojunction was confirmed by chronoamperometry analysis. An orderly corelationship among physicochemical, electrochemical, and photocatalytic properties was established, and a possible mechanistic pathway was presented to better understand the outcome of the n−n isotype heterojunction. This study presents an effective way to develop new n−n isotype heterojunction-based efficient photocatalysts and could enrich wide applications in other areas.
Journal of Colloid and Interface Science, Mar 1, 2021
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Inorganic Chemistry, Jan 11, 2021
Crystal facet engineering, a trending technique to acquire superior exciton pair anti-recombinati... more Crystal facet engineering, a trending technique to acquire superior exciton pair anti-recombination and interfacial charge pair separation via an inherent functional exposed facet isotype junction, is the current research hotspot. Selectively controlling facet exposure factor with Schottky energy barrier architecture across discerned exposed functional facet attested to facilitate electron injection-separation via a shorter barrier height and closer surface distance. In this context, a {040/110}-BiVO4@Ag@CoAl-LDH Z-scheme isotype heterostructure with elevated {040} facet exposure factor tailored a {040/110} crystal facet isotype junction, and {040}-BiVO4 functional facet/metallic Ag0 nano-island semiconductor-metal selective Schottky contact was fabricated meticulously via a three-step reflux, photoreduction, followed by an in situ co-precipitation method. Inherent attribution of crystal facet isotype junction and minor semiconductor-metal Schottky barrier toward the nature of exciton pair separation and elevated photoredox activity was neatly demonstrated and well inferred, which is the novelty of the present research. The ternary isotype heterostructure corroborates impressive gemifloxacin detoxification (89.72%, 90 min) and O2 generation (768 μmol, 120 min), which are multiple folds that of respective pure and binary isotype heterostructures. The bottom-up photoredox activity was well ascribed to shorter Schottky barrier hot electron channelization provoked superior exciton pair separation and well attested via linear sweep voltammetry (315 μA), photoluminescence, electrochemical impedance spectroscopy, Bode, carrier density, and transient photocurrent analysis. The research illustrates a novel insight and scientific basis for the rational design of crystal facet isotype junction and selective Schottky contact vectorial electron shuttling promoted Z-scheme charge transfer dynamics isotype heterostructure systems toward photocatalytic energy-environmental remediation.
Journal of Colloid and Interface Science, Oct 1, 2019
Construction of M-BiVO 4 /T-BiVO 4 isotype heterojunction for enhanced photocatalytic degradation... more Construction of M-BiVO 4 /T-BiVO 4 isotype heterojunction for enhanced photocatalytic degradation of Norfloxacine and Oxygen evolution reaction,
Inorganic Chemistry, Jun 25, 2020
Controlling the phase, crystallinity, and microstructure and fabricating a facet isotype heteroju... more Controlling the phase, crystallinity, and microstructure and fabricating a facet isotype heterojunction with a proscribed reduction− oxidation facet exposure factor have a strong constructive effect toward photoexciton separation and migration. In this respect, here diverse synthetic courses such as calcination (BiVO 4-C), hydrothermal treatment (BiVO 4-H), and a reflux method (BiVO 4-R) are introduced to fabricate various hierarchical morphologies of highly crystalline monoclinic scheelite bismuth vanadate (BiVO 4) with different redox facet exposure factors that have been well established by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy analysis. The analytical and experimental investigations revealed superior photocatalytic upshots of a BiVO 4-R {040/110} facet isotype heterojunction toward levofloxacin (LVF) detoxification (71.2%, 120 min) and the water oxidation reaction (530.6 μmol, 120 min) relative to BiVO 4-C (42.3%, 434.2 μmol) and BiVO 4-H (60.4%, 494.8 μmol). Accordingly, the BiVO 4-R {040/110} facet isotype heterojunction (145.6 μA/cm 2) expressed an enhanced photocurrent in comparison to pristine BiVO 4-C (75.5 μA/cm 2) and BiVO 4-H (113.1 μA/cm 2). The superior photocatalytic redox efficiency was attributed to well-exposed {040} reduction and {110} oxidation facets and a superior relative {040} facet exposure factor provoking an enhanced charge carrier separation over a BiVO 4-R {040/110} facet isotype heterojunction. The spatial exciton separation over the BiVO 4-R sample was well established by numerous analytical and experimental investigations. The effectual associations among physicochemical, photoelectrochemical properties, {040/110} facet isotype heterojunction, relative reduction−oxidation facet exposure factor, and photocatalytic performances of fabricated BiVO 4 microstructures were well established, and the upshots of this research were discussed finely. The research signifies an effectual direction for morphology and relative reduction−oxidation facet exposure factor controlled fabrication of facet isotype heterojunction based materials for superior photocatalysis and could be advantageous for supplementary research areas.
Journal of Colloid and Interface Science, 2019
Combatting antibiotic resistance will require both new antibiotics and strategies to preserve the... more Combatting antibiotic resistance will require both new antibiotics and strategies to preserve the effectiveness of existing drugs. Both approaches would benefit from predicting optimal dosing of antibiotics based on drug-target binding parameters that can be measured early in drug development and that can change when bacteria become resistant. This would avoid the currently frequently employed trial-and-error approaches and might reduce the number of antibiotic candidates that fail late in drug development. Here, we describe a computational model (COMBAT-COmputational Model of Bacterial Antibiotic Target-binding) that leverages accessible biochemical parameters to quantitatively predict antibiotic dose-response relationships. We validate our model with MICs of a range of quinolone antibiotics in clinical isolates demonstrating that antibiotic efficacy can be predicted from drug-target binding (R 2 > 0.9). To further challenge our approach, we do not only predict antibiotic efficacy from biochemical parameters, but also do the reverse: estimate the magnitude of changes in drug-target binding based on antibiotic dose-response curves. We experimentally demonstrate that changes in drug-target binding can be predicted from antibiotic dose-response curves with 92-94 % accuracy by exposing bacteria overexpressing target molecules to ciprofloxacin. To test the generality of COMBAT, we apply it to a different antibiotic class, the beta-lactam ampicillin, and can again predict binding parameters from dose-response curves with 90 % accuracy. We then apply COMBAT to predict antibiotic concentrations that can select for resistance due to novel resistance mutations. certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Our goal here is dual: First, we address a fundamental biological question and demonstrate that drug-target binding determines bacterial response to antibiotics, although antibiotic action involves many additional effects downstream of drug-target binding. Second, we create a tool that can help accelerate drug development by predicting optimal dosing and preserve the efficacy of existing antibiotics by predicting optimal treatment for possible resistant mutants.
Inorganic Chemistry, 2020
Controlling the phase, crystallinity, and microstructure and fabricating a facet isotype heteroju... more Controlling the phase, crystallinity, and microstructure and fabricating a facet isotype heterojunction with a proscribed reduction-oxidation facet exposure factor have a strong constructive effect toward photoexciton separation and migration. In this respect, here diverse synthetic courses such as calcination (BiVO4-C), hydrothermal treatment (BiVO4-H), and a reflux method (BiVO4-R) are introduced to fabricate various hierarchical morphologies of highly crystalline monoclinic scheelite bismuth vanadate (BiVO4) with different redox facet exposure factors that have been well established by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy analysis. The analytical and experimental investigations revealed superior photocatalytic upshots of a BiVO4-R {040/110} facet isotype heterojunction toward levofloxacin (LVF) detoxification (71.2%, 120 min) and the water oxidation reaction (530.6 μmol, 120 min) relative to BiVO4-C (42.3%, 434.2 μmol) and BiVO4-H (60.4%, 494.8 μmol). Accordingly, the BiVO4-R {040/110} facet isotype heterojunction (145.6 μA/cm2) expressed an enhanced photocurrent in comparison to pristine BiVO4-C (75.5 μA/cm2) and BiVO4-H (113.1 μA/cm2). The superior photocatalytic redox efficiency was attributed to well-exposed {040} reduction and {110} oxidation facets and a superior relative {040} facet exposure factor provoking an enhanced charge carrier separation over a BiVO4-R {040/110} facet isotype heterojunction. The spatial exciton separation over the BiVO4-R sample was well established by numerous analytical and experimental investigations. The effectual associations among physicochemical, photoelectrochemical properties, {040/110} facet isotype heterojunction, relative reduction-oxidation facet exposure factor, and photocatalytic performances of fabricated BiVO4 microstructures were well established, and the upshots of this research were discussed finely. The research signifies an effectual direction for morphology and relative reduction-oxidation facet exposure factor controlled fabrication of facet isotype heterojunction based materials for superior photocatalysis and could be advantageous for supplementary research areas.
Journal of Colloid and Interface Science
ACS Omega
To surmount incompatibility provoked efficiency suppression of an anisotype heterojunction and to... more To surmount incompatibility provoked efficiency suppression of an anisotype heterojunction and to pursue an improved intrinsic photocatalytic activity by manipulating oriented transfer of photoinduced charge carriers, an In 2 S 3 /BiVO 4 (1:1) n−n isotype heterojunction was fabricated successfully through a simple twostep calcination method, followed by a wet-chemical deposition method. The formation of an n−n isotype heterojunction was confirmed by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV− visible diffuse reflectance spectroscopy. The photocatalytic efficiency of the In 2 S 3 / BiVO 4 catalyst was examined over degradation of oxytetracycline hydrochloride (O-TCH) and oxygen (O 2) evolution reaction. Consequently, an n−n In 2 S 3 /BiVO 4 isotype heterojunction exhibits a superior O-TCH degradation efficiency (94.6%, 120 min) and O 2 evolution (695.76 μmol, 120 min) of multiple folds as compared to the pure BiVO 4 and In 2 S 3 solely. This is attributed to the proper band alignment and intimate interfacial interaction promoted charge carrier separation over the n−n isotype heterojunction. The intimate interfacial contact was confirmed by transmission electron microscopy (TEM), high-resolution TEM, and field emission scanning electron microscopy analysis. The proper band alignment was confirmed by Mott−Schottky analysis. The photoelectrochemical linear sweep voltammetric study shows a superior photocurrent density (269 μA/cm 2) for In 2 S 3 / BiVO 4 as compared to those for pristine BiVO 4 and In 2 S 3 , which is in good agreement with the photocatalytic results. Furthermore, the superior charge antirecombination efficiency of the n−n isotype heterojunction was established by photoluminescence, electrochemical impedance spectroscopy, Bode analysis, transient photocurrent, and carrier density analysis. The improved photostability of the heterojunction was confirmed by chronoamperometry analysis. An orderly corelationship among physicochemical, electrochemical, and photocatalytic properties was established, and a possible mechanistic pathway was presented to better understand the outcome of the n−n isotype heterojunction. This study presents an effective way to develop new n−n isotype heterojunction-based efficient photocatalysts and could enrich wide applications in other areas.
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Papers by Dr. Basudev Baral