Browsing by Author "Sharma, Sheetal"
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Item Open Access Carbon quantum dot supported semiconductor photocatalysts for efficient degradation of organic pollutants in water: a review(Elsevier, 2019-04-25) Sharma, Sheetal; Dutta, Vishal; Singh, Pardeep; Raizada, Pankaj; Rahmani-Sani, Abolfazl; Hosseini-Bandegharaei, Ahmad; Thakur, Vijay KumarSemiconductor photocatalyst mediated advanced oxidation processes are regarded as one of the most efficient technologies to mitigate organic pollutants in water. However, poor activity under visible light and the recombination of photogenerated electron and hole pairs hinder large scale applicability of semiconductor photocatalysts for water purification. The modification of semiconductor photocatalysts with carbon quantum dots (CQDs) is of high importance due to low toxicity, aqueous stability, enhanced surface area, economic feasibility, good biocompatibility and chemical inertness of CQDs. In this review, we highlight strategies to improve the activity of conventional semiconductor photocatalysts via coupling with CQDs. The enhanced photocatalytic activity of CQD modified narrow and wide band gap photocatalysts is due mainly to up-conversion photoluminescence (UPCL) and the electron reservoir properties of CQDs, while in the case of Z-scheme photocatalysts CQDs act as an electron mediator. Finally, a conclusive outlook and suggested research directions are provided to address challenges such as the inadequate separation of photoinduced charge carriers.Item Open Access Systematic review on applicability of magnetic iron-oxides integrated photocatalysts for degradation of organic pollutants in water(Elsevier, 2019-09-20) Singh, Pardeep; Sharma, Kirti; Hasija, Vasudha; Sharma, Vishal; Sharma, Sheetal; Raizada, Pankaj; Singh, Mahavir; Saini, Adesh K.; Hosseini-Bandegharaei, Ahmad; Thakur, Vijay KumarOwing to biocompatibility, abundance, and low cost, magnetic iron oxides are well suited for the design of efficient and magnetically separable photocatalysts for water treatment. This review presents a detailed survey of magnetic iron oxide–integrated photocatalysts (MIOIPs), in which we have discussed essential conditions needed for designing of efficient MIOIPs for water purification. The synthesis methods and detailed experimental setups for fabrication of MIOIPs were discussed, and the integration manners of iron oxides (Fe2O3, Fe3O4, FeO, and ferrites) with binary, ternary, and quaternary non-magnetic photocatalysts have been categorized. The mechanistic view of enhanced photocatalytic activity caused by different MIOIPs under various light sources was also elaborately argued. The role of various reactive species in photocatalytic oxidative degrading of organic pollutants was investigated. Altogether, this review article has compressively considered and discussed various signs of advancements made toward the synthesis of MIOIPs and their stability, recyclability, and catalytic efficacy for wastewater treatment.