Photocatalytic ozonation-based degradation of phenol by ZnO-TiO2 nanocomposites in spinning disk reactor

doi:10.1016/j.cjche.2024.03.028

中国化学工程学报 ›› 2024, Vol. 72 ›› Issue (8): 74-84.DOI: 10.1016/j.cjche.2024.03.028

Photocatalytic ozonation-based degradation of phenol by ZnO-TiO₂ nanocomposites in spinning disk reactor

Xueqing Ren¹, Jiahao Niu², Yan Li¹, Lei Li¹, Chao Zhang¹, Qiang Guo¹, Qiaoling Zhang¹, Weizhou Jiao¹

1 Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030051, China;
2 Shanxi Sanqiang New Energy Technology Co., Ltd, Taiyuan 030051, China

收稿日期:2024-01-23 修回日期:2024-03-28 出版日期:2024-08-28 发布日期:2024-10-17
通讯作者: Qiaoling Zhang,E-mail:zhangqiaoling@nuc.edu.cn. Tel:+86 3513921986,Fax:+86 3513921650
基金资助:
This work was supported by the National Natural Science Foundation of China (22208328) and Fundamental Research Program of Shanxi Province (20210302124618, 202203021212134).

Photocatalytic ozonation-based degradation of phenol by ZnO-TiO₂ nanocomposites in spinning disk reactor

Xueqing Ren¹, Jiahao Niu², Yan Li¹, Lei Li¹, Chao Zhang¹, Qiang Guo¹, Qiaoling Zhang¹, Weizhou Jiao¹

1 Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030051, China;
2 Shanxi Sanqiang New Energy Technology Co., Ltd, Taiyuan 030051, China

Received:2024-01-23 Revised:2024-03-28 Online:2024-08-28 Published:2024-10-17
Contact: Qiaoling Zhang,E-mail:zhangqiaoling@nuc.edu.cn. Tel:+86 3513921986,Fax:+86 3513921650
Supported by:
This work was supported by the National Natural Science Foundation of China (22208328) and Fundamental Research Program of Shanxi Province (20210302124618, 202203021212134).

摘要/Abstract

摘要： Spinning disk reactor (SDR) has emerged as a novel process intensification photocatalytic reactor, and it has higher mass transfer efficiency and photon utilization for the degradation of toxic organic pollutants by advanced oxidation processes (AOPs). In this study, ZnO-TiO₂ nanocomposites were prepared by sol-gel method, and coated on the disk of SDR by impregnation-pull-drying-calcination method. The performance of catalyst was characterized by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, photoluminescence and ultraviolet-visible diffuse reflectance spectroscopy. Photocatalytic ozonation in SDR was used to remove phenol, and various factors on degradation effect were studied in detail. The results showed that the rate of degradation and mineralization reached 100% and 83.4% under UV light irradiation after 50 min, compared with photocatalysis and ozonation, the removal rate increased by 69.3% and 34.7%, and mineralization rate increased by 56.7% and 62.9%, which indicated that the coupling of photocatalysis and ozonation had a synergistic effect. The radical capture experiments demonstrated that the active species such as photogenerated holes (h⁺), hydroxyl radicals (·OH), superoxide radical (·O₂^-) were responsible for phenol degradation, and ·OH played a leading role in the degradation process, while h⁺ and ·O₂^- played a non-leading role.

关键词: Spinning disk reactor, Photocatalytic ozonation, ZnO-TiO₂ nanocomposites, Advanced oxidation processes

Abstract: Spinning disk reactor (SDR) has emerged as a novel process intensification photocatalytic reactor, and it has higher mass transfer efficiency and photon utilization for the degradation of toxic organic pollutants by advanced oxidation processes (AOPs). In this study, ZnO-TiO₂ nanocomposites were prepared by sol-gel method, and coated on the disk of SDR by impregnation-pull-drying-calcination method. The performance of catalyst was characterized by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, photoluminescence and ultraviolet-visible diffuse reflectance spectroscopy. Photocatalytic ozonation in SDR was used to remove phenol, and various factors on degradation effect were studied in detail. The results showed that the rate of degradation and mineralization reached 100% and 83.4% under UV light irradiation after 50 min, compared with photocatalysis and ozonation, the removal rate increased by 69.3% and 34.7%, and mineralization rate increased by 56.7% and 62.9%, which indicated that the coupling of photocatalysis and ozonation had a synergistic effect. The radical capture experiments demonstrated that the active species such as photogenerated holes (h⁺), hydroxyl radicals (·OH), superoxide radical (·O₂^-) were responsible for phenol degradation, and ·OH played a leading role in the degradation process, while h⁺ and ·O₂^- played a non-leading role.

Key words: Spinning disk reactor, Photocatalytic ozonation, ZnO-TiO₂ nanocomposites, Advanced oxidation processes

Xueqing Ren, Jiahao Niu, Yan Li, Lei Li, Chao Zhang, Qiang Guo, Qiaoling Zhang, Weizhou Jiao. Photocatalytic ozonation-based degradation of phenol by ZnO-TiO₂ nanocomposites in spinning disk reactor[J]. 中国化学工程学报, 2024, 72(8): 74-84.

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Photocatalytic ozonation-based degradation of phenol by ZnO-TiO₂ nanocomposites in spinning disk reactor

Photocatalytic ozonation-based degradation of phenol by ZnO-TiO₂ nanocomposites in spinning disk reactor

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