期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 435, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129073
关键词
ZnO; Crystal facets; Oxide-ion vacancy; Photocatalysis; NO oxidation
资金
- Natural Science Foundation of China (NSFC) [41371275, 42007156]
- research Funding for Central Universities [SWURC2020002]
- Chongqing Science and Technology Committee [cstc2021ycjh-bgzxm0162]
- Chongqing Bayu Young Scholar from Chongqing Teaching Committee
- Chongqing Yingcai Talent
This study demonstrates that different crystal facets have significant effects on the catalytic performance in the gas-phase degradation of NO. ZnO crystals with lower flat-band energy and enhanced (0002) facet show better performance in the photoelectrochemical water-oxidation, while those with exposed (101(-)1) facet have higher affinity to NO molecules. Additionally, the oxygen vacancies play a minor role in the photocatalytic oxidation of NO.
Photocatalysis is believed to be an important way of reducing NO pollutant in air and the facet engineering of semiconducting oxides could enhance the efficiency of the photocatalysis. ZnO nanoparticles with different exposed crystalline facets were successfully synthesized using a hydrothermal method and their photocatalytic degradation towards NO was investigated. The crystals from ZnCl2 precursor were hexagonal mesoporous ones with exposed (0002) facet, while those from zinc acetate were in the form of flakes or wheat ears with enhanced exposure of (101( -)1) facet. Calcination in air imparted an enhanced the textural coefficient of the orientated facets as well as the oxygen defects. The nanocrystals with enhanced (0002) facet and lower flat-band energy did better in photoelectrochemical water-oxidation than those with exposed (101(-)1) facet that showed superior photocatalytic activity (approaching 76.7 +/- 0.6% under 365 nm photons) for NO oxidation. According to theoretical calculations, (101(-)1) facet with O termination showed much higher affinity to NO molecules than other configurations, and the oxygen vacancy in ZnO played an minor role in the photocatalytic oxidation of NO. A high quantum efficiency approaching 97.5 +/- 1.4% under 275 nm photons was obtained for the ZnO crystals from zinc acetate with mixed (0002) and (101(-)1) facets. This research explores the special characteristics of ZnO with different exposed facets and is important for the future design of highly efficient photocatalyst for hazardous material removal.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据