DOI: 10.16597/j.cnki.issn.1002-154x.2024.04.002

CdS量子点/La2Ti2O7非均相光催化降解盐酸左氧氟沙星

 赵敏，吴敏

东南大学化学化工学院，南京 210000

**摘要：**光催化降解技术因其能够利用太阳能高效降解有机污染物而受到广泛关注。半导体量子点(QDs)由于具有窄带隙以及尺寸可调特性等优点，已经广泛应用于光催化领域。作者通过原位水热法制备了CdS QDs/La2Ti2O7复合光催化剂，通过X-射线粉末衍射、高分辨透射电镜、紫外-可见漫反射光谱等方法评估其结构、形貌及对盐酸左氧氟沙星(LVF)的光催化降解性能的影响。通过调控CdS QDs与La2Ti2O7的配比显著提高了光催化活性，其中CdS QDs/La2Ti2O7(2/1)表现出最佳的光催化效率，其对LVF的降解率在30分钟内可达90.9%，这主要归因于CdS QDs和La2Ti2O7之间形成了紧密的异质结结构，促进了光生载流子的迁移，从而提高了光催化活性。此外，催化剂展现了良好的稳定性和可重复利用性，证实了其在实际光催化应用中的潜力。

**关键词：**CdS，La2Ti2O7，光催化，盐酸左氧氟沙星

Heterogeneous Photocatalytic Degradation of Levofloxacin Hydrochloride by CdS QDs/La2Ti2O7

Authors: ZHAO Min, WU Min

Affiliation: School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210000, China

Abstract: Photocatalysis degradation technology has been widely concerned because of its ability to use solar energy to efficiently degrade organic pollutants. Semiconductor quantum dots (QDs), such as CdS, have been widely used in the field of photocatalysis due to their advantages of narrow band gap and adjustable size. In this study, CdS QDs/La2Ti2O7 composite photocatalyst was prepared by in-situ hydrothermal method. The structure, morphology of catalyst, and photocatalytic degradation of levofloxacin hydrochloride (LVF) were evaluated by XRD, TEM, and UV-vis. We found that by adjusting the ratio of CdS QDs to La2Ti2O7, the photocatalytic activity could be significantly improved. Among them, CdS QDs/La2Ti2O7 (2/1) showed the best photocatalytic efficiency, and its degradation rate of LVF could reach 90.9% within 30 min. This was mainly due to the formation of a tight heterostructure between CdS QDs and La2Ti2O7, which promoted the migration of photogenerated carriers and improved the photocatalytic activity. In addition, the catalyst showed good stability and reusability, demonstrating its potential for practical photocatalytic applications.

Keywords: CdS, La2Ti2O7, photocatalysis, levofloxacin hydrochloride