Enhanced photocatalytic properties of ZnO nanorods by electrostatic self-assembly with reduced graphene oxide

Physical Chemistry Chemical Physics : PCCP
Fengzhi WangZhizhen Ye

Abstract

A series of ZnO nanorod (NR)-reduced graphene oxide (rGO) nanocomposites (NCs) (i.e., ZnO-rGO NCs) with varying rGO loadings were fabricated by electrostatic self-assembly of positively charged ZnO NRs with negatively charged graphene oxide (GO), followed by the hydrothermal reduction of GO to rGO. When compared with bare ZnO NRs, ZnO-5% rGO exhibited significant photoactivity 6 times higher in the photodegradation of rhodamine B (RhB), and 2 times higher than ZnO-5% rGO(H) synthesized by hard integration of GO and ZnO NRs. In the same manner, ZnO-5% rGO exhibited a significant photoactivity 3 times higher in photodegrading phenol, which is 2 times higher than ZnO-5% rGO(H). Furthermore, the adsorption properties of ZnO-rGO NCs towards RhB and phenol were significantly different as a result of the opposite charges of the two pollutants in aqueous solution, which also led to the formation of different key free radicals during the degradation reaction. Based on various characterization techniques, it is concluded that the enhanced photoactivity and photostability of ZnO-5% rGO originated from the synergistic effects between ZnO NRs and rGO nanosheets including higher specific surface area, enhanced photogenerated carrier separati...Continue Reading

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Citations

Jan 16, 2020·Physical Chemistry Chemical Physics : PCCP·XiangDong YangHongYing Mao
Aug 12, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Yuting BaiShengqian Ma
Nov 23, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Yuxin YanFeimin Zhang
Jan 23, 2021·Journal of Colloid and Interface Science·Balaji G GhuleRajaram S Mane
Dec 4, 2020·International Journal of Molecular Sciences·Yuchao LiSie Chin Tjong

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Methods Mentioned

BETA
X-ray
transmission electron microscopy
scanning electron microscopy

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