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镧掺杂TiO@g-CN可见光活化过硫酸盐光催化降解盐酸四环素

Photocatalytic degradation of tetracycline hydrochloride by lanthanum doped TiO@g-CN activated persulfate under visible light irradiation.

作者信息

Wang Yan, Xiu Jingyu, Gan Tao, Zou Haiming, Li Feiyue

机构信息

Department of Environmental Science and Engineering, Anhui Science and Technology University Donghua Road 9# Fengyang 233100 China

出版信息

RSC Adv. 2023 Mar 14;13(12):8383-8393. doi: 10.1039/d3ra00729d. eCollection 2023 Mar 8.

DOI:10.1039/d3ra00729d
PMID:36926009
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10012182/
Abstract

In this work, a visible light-driven La/TiO@g-CN photocatalyst was synthesized for the photodegradation of tetracycline hydrochloride (TCH) in the presence of peroxydisulfate (PDS) in an internal loop-lift reactor. The surface morphology and structure of La/TiO@g-CN have been characterized by XRD, SEM-EDS, FTIR, XPS, and UV/vis DRS. La/TiO@g-CN displays outstanding photocatalytic performance and reusability. After four reuse cycles of the vis/La/TiO@g-CN/PDS system, the TCH degradation rate and efficiency still reached 0.083 min and 97.68%, respectively. Reactive species in this system included free radicals SO˙, ˙OH, and ˙O , as well as non-radicals e, and h, as established from the results of chemical quenching experiments. Moreover, a mechanism of action of the vis/La/TiO@g-CN/PDS system for TCH degradation was proposed. The acute toxicity of the reaction solution towards T3 spp. in the vis/La/TiO@g-CN/PDS process increased during the first 60 min and then decreased, illustrating that vis/La/TiO@g-CN/PDS provided an effective and safe method for the removal of TCH.

摘要

在本研究中，合成了一种可见光驱动的La/TiO@g-CN光催化剂，用于在内循环提升反应器中过二硫酸盐（PDS）存在下光催化降解盐酸四环素（TCH）。通过XRD、SEM-EDS、FTIR、XPS和UV/vis DRS对La/TiO@g-CN的表面形貌和结构进行了表征。La/TiO@g-CN表现出优异的光催化性能和可重复使用性。在vis/La/TiO@g-CN/PDS体系进行四次重复使用循环后，TCH的降解速率和效率仍分别达到0.083 min和97.68%。根据化学猝灭实验结果确定，该体系中的活性物种包括自由基SO˙、˙OH和˙O ，以及非自由基e和h。此外，还提出了vis/La/TiO@g-CN/PDS体系降解TCH的作用机制。在vis/La/TiO@g-CN/PDS过程中，反应溶液对T3 spp.的急性毒性在前60分钟内增加，然后降低，这表明vis/La/TiO@g-CN/PDS为去除TCH提供了一种有效且安全的方法。

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