1. ZnO-based heterostructures as photocatalysts for hydrogen generation and depollution: a review.
- Author
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Dhiman, Pooja, Rana, Garima, Kumar, Amit, Sharma, Gaurav, Vo, Dai-Viet N., and Naushad, Mu.
- Subjects
INTERSTITIAL hydrogen generation ,PHOTOCATALYSTS ,HETEROSTRUCTURES ,HYDROGEN production ,POLLUTANTS ,ENERGY shortages ,ZINC sulfide ,TUNGSTEN trioxide - Abstract
Energy shortage and escalating pollution are major challenges globally. Heterogeneous photocatalysis is one of the most cost-effective methods for producing renewable energy and removing pollutants. In particular, ZnO nanostructures are promising photocatalysts that are economic, stable, and biologically safe. ZnO-based nanoheterostructures have been used for heavy metal reduction, organic pollutants degradation, photocatalytic hydrogen production, and drug mineralization. Here, we review ZnO-based nanoheterojunctions as photocatalysts for hydrogen production and pollutant degradation. Hydrogen production has reached 1200 mol g
−1 h−1 using Ce-doped ZnO/ZnS heterojunction, with a 8.5-fold higher efficiency than bare ZnO. Nearly complete removal of a dye pollutant was achieved in 15 min using hybrid ethyl cellulose-modified g-C3 N4 /ZnO. Moreover, ZnO/Ag2 WO4 /Fe3 O4 showed a 152% and 143% higher antibiotic degradation rate than bare Ag2 WO4 and ZnO, respectively. We present methods to modify ZnO, including coupling with other semiconductors, metal/non-metal doping, and carbon-based materials coupling; and methods for charge divergence in binary and ternary ZnO-based nanocomposites. [ABSTRACT FROM AUTHOR]- Published
- 2022
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