Effect of SiO 2 aerogels loading on photocatalytic degradation of nitrobenzene using composites with tetrapod-like ZnO

Nanotechnology Reviews

article

Zhigang Yi¹  Tao Jiang¹  Ying Cheng¹  Qiong Tang¹ 

[1] Department of Chemistry, Leshan Normal University

关键词: silica aerogels;    tetrapod-like zinc oxide;    adsorption property;    photocatalytic performance;    nitrobenzene;   

DOI  :  10.1515/ntrev-2020-0081

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

To study the effect of improved adsorption property of tetrapod-like ZnO (T-ZnO) on its photocatalytic performance, a new composite was prepared by loading silica aerogels (SiO 2 (AG)) on the surface of T-ZnO via the sol–gel method. Various characterization methods showed that SiO 2 (AG) was uniformly loaded on the surface of T-ZnO, and the morphology as well as structural characteristics of SiO 2 (AG) and T-ZnO were not changed. Nitrobenzene (NB) was selected as the model pollutant, and the adsorption and photocatalytic properties of T-ZnO and SiO 2 (AG)/T-ZnO for NB were studied. The photocatalytic degradation processes of NB using T-ZnO and SiO 2 (AG)/T-ZnO followed the first-order reaction. Considering the initial moment reaction kinetic, the photocatalytic kinetic of SiO 2 (AG)/T-ZnO and T-ZnO was consistent with the Langmuir–Hinshelwood kinetic model, and reaction rate constant k SiO 2 AG / T-ZnO ′ > k T-ZnO ′ {k}_{{\text{SiO}}_{2}\left(\text{AG}\right)/\text{T-ZnO}}^{^{\prime} }\gt {k}_{\text{T-ZnO}}^{^{\prime} } , adsorption rate constant K ad SiO 2 ( AG ) / T-ZnO {K}_{\text{ad}{\text{SiO}}_{2}(\text{AG})/\text{T-ZnO}} > K ad T-ZnO , which demonstrated that SiO 2 (AG) loading could increase T-ZnO adsorption to NB, then promoted its photocatalytic performance.

【 授权许可】

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