Photocatalytic Degradation of Tetracycline Hydrochloride by CeO2@UiO⁃66

doi:10.12422/j.issn.1672-6952.2024.05.002

Abstract

Abstract:

The environmental contamination caused by tetracycline hydrochloride (TC) has aroused widespread concern, photocatalytic degradation of TC has become an effective method. CeO₂ was prepared by coprecipitation method, and solvothermal synthesis of CeO₂@UiO-66 composite catalysts. The prepared catalysts were characterized by FT-IR, XRD, SEM and EDS respectively, and the effects of the amount of CeO₂, catalyst mass concentration and H₂O₂ mass fraction on the photocatalytic degradation of TC were also investigated. The results showed that CeO₂@UiO?66 was successfully synthesized. When the amount of CeO₂ substance is 25 mmol, the mass concentration of TC solution is 20 mg/L, the mass concentration of catalyst is 0.2 g/L, and the mass fraction of H₂O₂ is 2%, CeO₂@UiO?66 photocatalytic effect is the best, and the TC degradation rate reaches over 98% when irradiated by UV lamp for 70 min. The free radical trapping experiments showed that holes and ·OH were the main contributors in the photocatalytic process. In addition, after six cycles, the degradation rate of TC composite photocatalyst can still maintain above 85%, which indicates its good stability.

Key words: UiO?66, CeO₂, Tetracycline hydrochloride, Photocatalysis

摘要：

盐酸四环素（TC）对环境的污染引起了广泛关注，通过光催化降解TC已经成为一种有效的方法。使用共沉淀法制备CeO₂，溶剂热法合成CeO₂@UiO-66复合催化剂，对制备的催化剂分别采用FT-IR、XRD、SEM、EDS等手段进行表征，同时研究了CeO₂物质的量、催化剂质量浓度和H₂O₂质量分数对TC的光催化降解效果的影响。结果表明，成功地合成了CeO₂@UiO?66；当CeO₂物质的量为25 mmol、TC溶液质量浓度为20 mg/L、催化剂质量浓度为0.2 g/L、H₂O₂质量分数为2%时，CeO₂@UiO?66光催化效果最佳，在紫外灯照射70 min，TC降解率达到98%以上。通过自由基捕获实验可知，空穴和·OH是光催化过程中的主要贡献者。此外，经过6次循环，复合光催化剂对TC降解率仍能保持85%以上，表明其具有良好的稳定性。

关键词: UiO?66, CeO₂, 盐酸四环素, 光催化

CLC Number:

TQ317

Lin ZHANG, Xiaojie GONG, Lihua LI. Photocatalytic Degradation of Tetracycline Hydrochloride by CeO₂@UiO⁃66[J]. Journal of Liaoning Petrochemical University, 2024, 44(5): 8-14.

张琳, 宫晓杰, 李丽华. CeO₂@UiO⁃66光催化降解盐酸四环素[J]. 辽宁石油化工大学学报, 2024, 44(5): 8-14.

Figures/Tables 9

Fig. 1 XRD spectra of the samples

Fig. 2 SEM image of the samples

Fig. 3 EDS image of CU?25

Fig.4 FT?IR image of the samples

Fig.5 Effect of the amount of CeO2 on TC degradation rate

Fig.6 Effect of catalyst mass concentration on TC degradation rate

Fig.7 Effect of H2O2 mass fraction on TC degradation rate

Fig.8 Effect of free radical trapping agents on TC degradation rate

Fig. 9 Effect of recycling of catalyst CU?25

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Photocatalytic Degradation of Tetracycline Hydrochloride by CeO₂@UiO⁃66

CeO₂@UiO⁃66光催化降解盐酸四环素

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