Yazar "Chaudhary, Vishal" seçeneğine göre listele

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    Oxygen vacancy enriched SrTiO3 and NiO-based S-scheme heterojunction moored on activated carbon from exhausted water filter batteries for ameliorated photodegradation of doxycycline hydrochloride and methyl orange degradation
    (Elsevier, 2024) Soni, Vatika; Sonu; Singh, Pardeep; Thakur, Sourbh; Ahamad, Tansir; Nguyen, Van -Huy; Chaudhary, Vishal
    Background: In this research study, O-SrTiO3/NiO/AC-EWC photocatalytic heterojunction was firstly fabricated hydrothermally followed by a thermal decomposition method for aqueous doxycycline and methyl orange photodegradation. The XRD plots depict the formation of crystalline bare SrTiO3, O-SrTiO3, NiO, and amorphous activated carbon from exhausted water filter cartridges. UV-vis spectroscopy revealed improved light absorption of O-SrTiO3/NiO/AC-EWC than bare semiconductors owing to synergistic effects of present oxygen vacancies and formation of heterojunction. EIS Nyquist plots and PL spectra studies depicted that O-SrTiO3/NiO/AC-EWC heterojunction showed maximum charge isolation and migration to surface of semiconductors. Constructed S-scheme heterojunction between O-SrTiO3 and NiO supported by AC-EWC was significant to separate the photogenerated charges for the generation of active radicals with superior redox potential. Significant findings: Under 30 min of dark, O-SrTiO3/NiO/AC-EWC exhibited the highest DCHCl (39 %) and MO (35 %) adsorption from the reaction mixture. After 60 min of illumination, total DCHCl and MO degradation efficiency order was found to be O-SrTiO3/NiO/AC-EWC>O-SrTiO3/AC-EWC>O-SrTiO3>NiO>SrTiO3. Overall, O-SrTiO3/NiO/AC-EWC heterojunction has the highest degradation rate of 95.7 %, 96.2 % as well as rate constant k, 0.01513 min(-1), and 0.019 min(-1) for DCHCl and MO, respectively. A significant decrease in photoactivity of O-SrTiO3/NiO/AC-EWC on adding scavengers revealed the active role of reactive center dot O-2(-), center dot OH, h(+) for the degradation. Satisfactory reusability of effective O-SrTiO3/NiO/AC-EWC S-scheme heterojunction was demonstrated after 4 runs and found to be 91 % and 92.2 % for DCHCl and MO degradation, respectively in recycling tests. This study will shed new light on the design, and growth of integrated photocatalyst systems, and the removal of antibiotics and dyes.
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    Tailoring dual S-Scheme based g-C3N4/ZnO/TiO2 ternary photocatalytic system immobilized on floating cork for environmental remediation
    (Elsevier, 2025) Rana, Anchal; Sonu, Sonu; Sudhaik, Anita; Kumar, Rohit; Chawla, Akshay; Raizada, Pankaj; Chaudhary, Vishal
    Background: Light harvesting and reusability are the key factors for highly effective solar photocatalysis. Floating photocatalysts can maximize light utilization and be recycled easily, making them a strong candidate for real-world environmental applications. Methods: In this article, a novel dual s-scheme-based g-C3N4/ZnO/TiO2/Cork photocatalyst was constructed via a co-precipitation process followed by physical blending of the floating materials. In g-C3N4/ZnO/TiO2/Cork photocatalyst, cork acted as a floating substrate to enhance light exposure, oxygen availability, and reusability. The dual S-scheme charge transfers between g-C3N4, ZnO, and TiO2 improves carriers' charge separation and concentration. Advanced Spectral techniques were utilized to compare and analyze the morphological, structural, and optical characteristics. The photocatalytic activity was further analyzed by using methyl orange (MO) and doxycycline hydrochloride (DCl) as target pollutants. Significant findings: The g-C3N4/ZnO/TiO2/Cork heterojunction exhibited excellent photodegradation activity against MO dye (98.25 %) and DCl antibiotic (79.27 %) within 60 min under visible light. The scavenger experiment revealed that the O-center dot(2)- and (OH)-O-center dot radicals were the major reactive species in this photocatalytic experiment. Additionally, a better recyclability was also demonstrated by the g-C3N4/ZnO/TiO2/Cork heterojunction photocatalyst.
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    Unveiling new horizons of progress on manipulating the structure and characterization of phosphate-modified polymer for selective uranium adsorption
    (Elsevier Science Sa, 2024) Kaur, Balvinder; Rana, Parul; Singh, Pardeep; Singh, Archana; Chaudhary, Vishal; Kaya, Savas; Van Le, Quyet
    The hazardous effect of Uranium (U(VI)) on the environment principally stems from its metallic and radioactive properties. Considering the toxicity and radioactivity of U(VI)), there is an imperative necessity to remove U(VI)) from wastewater through various adsorbents. This comprehensive review delves into the quest for employing phosphate-modified polymers for U(VI) uptake by adsorption. The review emphasizes the critical role of U(VI) specific binding to phosphate-modified polymers in increasing the affinity of polymers toward U(VI). The merging of phosphate-based polymers and interactions such as coordination bonding and complexation generated a precise speculation of the chemisorption exhaustion mechanism. The advertisements for interactions with the adsorbent are determined by parameters like pH, coexisting ions, ionic strength, temperature, and contact time, which gives information about the adsorption process. This review summarises the recent breakthroughs towards the classifications, synthesis, and adsorption mechanism of phosphate-modified polymers. In turn, the capacity of phosphate-modified polymers to adsorb contributes to the fact that the polymers are regeneratable after desorption. Overall, this clarifies the potential of phosphate modification to improve the adsorption capacity of polymer adsorbents.