用生物OCl/绢云母纳米复合材料光催化降解洛沙坦

Catalysts Pub Date : 2024-07-07 DOI:10.3390/catal14070433
K. Kouvelis, Evangelia E. Karavaka, D. Panagiotaras, Dimitris Papoulis, Z. Frontistis, A. Petala
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引用次数: 0

摘要

开发高活性、可用、环保、低成本的光催化材料是光催化降解系统中最热门的课题之一。本研究制备了一系列 BiOCl/Sepiolite 复合光催化剂(范围为 5%BiOCl/Sepiolite-30%BiOCl/Sepiolite )。利用 X 射线衍射、漫反射光谱、扫描电子显微镜、液氮温度(77 K)下的氮物理吸附以及衰减全反射-傅立叶变换红外光谱对它们进行了表征。结果表明,复合光催化剂在水中降解抗高血压药物洛沙坦的效率优于母体材料,其中仅含有 10%wt.BiOCl 的样品性能最高。在 BiOCl 中添加海泡石的有益效果来自于表面积的增加、颗粒聚集的防止以及光生物种的有效分离。催化剂浓度从 125 毫克/升增加到 500 毫克/升时,表观动力学常数从 0.077 分钟-1 增加到 0.197 分钟-1,而洛沙坦浓度从 0.25 毫克/升增加到 5.00 毫克/升时,去除效率降低。此外,在瓶装水中,洛沙坦的降解仅受到部分阻碍,而在二级废水中,降解几乎停止。总之,这项研究为在光催化应用中使用土工聚合物提供了有益的指导。
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Photocatalytic Degradation of Losartan with BiOCl/Sepiolite Nanocomposites
Developing highly active and available, environmentally friendly, and low-cost photocatalytic materials is one of the most popular topics in photocatalytic degradation systems. In the present study, a series of BiOCl/Sepiolite composite photocatalysts were prepared (in the range of 5%BiOCl/Sepiolite–30%BiOCl/Sepiolite). Their characterization was conducted using X-ray diffraction, diffuse reflectance spectroscopy, scanning electron microscopy, nitrogen physical physisorption at the temperature of liquid nitrogen (77 K), and attenuated total reflectance-Fourier transform infrared spectroscopy. Results showed that composite photocatalysts possess superior efficiency than the parent materials for losartan, an antihypertensive agent, degradation in water, with the sample with only 10%wt. BiOCl shows the highest performance. The beneficial effect of the addition of sepiolite to BiOCl is derived from the increase in surface area, the prevention of particle aggregation, and the efficient separation of photogenerated species. Increasing catalyst concentration from 125 mg/L up to 500 mg/L was accompanied by an increase in the apparent kinetic constant from 0.077 min−1 to 0.197 min−1 while varying losartan concentration from 0.25 to 5.00 mg/L slowed down the removal efficiency. In addition, losartan degradation was only partially hampered in the case of bottled water, whereas it was practically stopped in a secondary wastewater effluent. Overall, this study serves as a useful guide for using geopolymers in photocatalytic applications.
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