Laboratory wastes containing Cd²⁺ and water polluted by pharmaceuticals represent an environmental concern. In this work, a proof concept, consisting of the use of teaching-laboratory wastes to synthesize CdS and its subsequent use as a photocatalyst to degrade fluoroquinolone antibiotics, was developed. The CdS was prepared by extraction with thioacetamide and calcination (at 450 °C) and characterized using several techniques. The photocatalytic activity of the CdS, to degrade levofloxacin and norfloxacin, was tested, and the routes involved in the process and the primary transformations of the fluoroquinolones were established. Moreover, the ability of CdS-photocatalysis to eliminate levofloxacin in simulated matrices of fresh urine and hospital wastewater was evaluated. The characterization analyses indicated that the CdS semiconductor was synthesized successfully. Effectively, the CdS acted as a photocatalyst toward degradation of levofloxacin, involving the action of superoxide anion radical, holes, and singlet oxygen mainly. The process induced transformations on the methyl-piperazyl moiety, plus hydroxylation of the fluoroquinolone nucleus on levofloxacin. Additionally, CdS-photocatalysis was highly selective for the elimination of the target pollutant in both tested matrices. Our research indicated the good potentiality of recycling teaching-laboratory wastes to generate photocatalysts to degrade organic pollutants. This work was presented at 4° Congreso Colombiano de Procesos Avanzados de Oxidación (4CCPAOx).

中文翻译：

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使用来自教学实验室废物的硫化镉作为光催化剂降解水中的氟喹诺酮类抗生素

含有 Cd ^{2+ 的}实验室废物被药物污染的水代表了环境问题。在这项工作中，开发了一个证明概念，包括使用教学实验室废物合成 CdS，随后将其用作光催化剂来降解氟喹诺酮类抗生素。CdS 是通过用硫代乙酰胺萃取和煅烧（在 450 °C 下）制备的，并使用多种技术进行表征。测试了 CdS 降解左氧氟沙星和诺氟沙星的光催化活性，并建立了该过程中涉及的路线和氟喹诺酮类的初级转化。此外，还评估了硫化镉光催化消除新鲜尿液和医院废水模拟基质中左氧氟沙星的能力。表征分析表明CdS半导体合成成功。有效，CdS作为光催化剂降解左氧氟沙星，主要涉及超氧阴离子自由基、空穴和单线态氧的作用。该过程诱导甲基-哌嗪基部分发生转变，加上左氧氟沙星上氟喹诺酮核的羟基化。此外，CdS 光催化对于消除两种测试基质中的目标污染物具有高度选择性。我们的研究表明，回收利用教学实验室废物产生光催化剂来降解有机污染物具有良好的潜力。这项工作在 4° Congreso Colombiano de Procesos Avanzados de Oxidación (4CCPAOx) 上展出。该过程诱导甲基-哌嗪基部分发生转变，加上左氧氟沙星上氟喹诺酮核的羟基化。此外，CdS 光催化对于消除两种测试基质中的目标污染物具有高度选择性。我们的研究表明，回收利用教学实验室废物产生光催化剂来降解有机污染物具有良好的潜力。这项工作在 4° Congreso Colombiano de Procesos Avanzados de Oxidación (4CCPAOx) 上展出。该过程诱导甲基-哌嗪基部分发生转变，加上左氧氟沙星上氟喹诺酮核的羟基化。此外，CdS 光催化对于消除两种测试基质中的目标污染物具有高度选择性。我们的研究表明，回收利用教学实验室废物产生光催化剂来降解有机污染物具有良好的潜力。这项工作在 4° Congreso Colombiano de Procesos Avanzados de Oxidación (4CCPAOx) 上展出。