Process Intensification Laboratory, Department of Chemical Engineering, Yasouj University, Yasouj, 75918-74831, Iran.
Process Intensification Laboratory, Department of Chemical Engineering, Yasouj University, Yasouj, 75918-74831, Iran.
J Environ Manage. 2022 Feb 1;303:114216. doi: 10.1016/j.jenvman.2021.114216. Epub 2021 Dec 9.
The presence of antibiotics in waste and drinking water is causing increasing concern around the world, thereby an advanced sustainable technology needs to be developed to eliminate the antibiotics from water resources. Hence, an efficient spinning disc photoreactor (SDPR) equipped with visible light-activated Ag/AgO/TiO heterostructure thin film photocatalyst was assessed for the degradation of amoxicillin (AMX) as a typical antibiotic. The surface morphology, optoelectronic and structural features of Ag/AgO/TiO heterojunction were characterized by TEM, BET, mott Schottky, FESEM, EDS, AFM, XRD, UV-Vis-DRS, and contact angle measurements. Results confirm that Ag and AgO have a significant effect on the photocharge carrier separation and transfer of the as-developed photocatalyst system. The operative variables including illumination time, rotational speed, solution flow rate, aeration rate, pH, and initial AMX concentration were optimized by CCD. The results displayed the maximum AMX photodegradation (97.91%) could be achieved at optimal conditions involving illumination time of 80 min, a rotational speed of 225 rpm, the solution flow rate of 0.6 L/min, aeration rate of 20 L/min, pH = 6, and initial AMX concentration of 20 mg/L. Interestingly, more than 79% COD and 64% TOC were removed under optimum conditions during 80 min illumination time, respectively. Active species tests confirmed the dominant role of ·OH and ·O in AMX degradation. finally, the XRD pattern confirmed that the reusability assessments of the heterojunction film could successfully retain its stability for six consecutive photocatalytic degradation runs. This work demonstrates the feasibility of utilizing visible-light-driven thin-film photocatalysts in spinning disc photoreactors in treating the tenacious antibiotic pollutants.
废水中和饮用水中抗生素的存在引起了全世界越来越多的关注，因此需要开发先进的可持续技术来消除水资源中的抗生素。因此，评估了一种配备可见光激活的 Ag/AgO/TiO 异质结构薄膜光催化剂的高效旋转盘光反应器 (SDPR)，以降解阿莫西林 (AMX) 作为典型抗生素。通过 TEM、BET、Mott-Schottky、FESEM、EDS、AFM、XRD、UV-Vis-DRS 和接触角测量对 Ag/AgO/TiO 异质结的表面形貌、光电和结构特征进行了表征。结果证实，Ag 和 AgO 对所开发的光催化剂体系的光电荷载流子分离和转移有显著影响。通过 CCD 优化了包括光照时间、转速、溶液流速、曝气率、pH 值和初始 AMX 浓度在内的操作变量。结果显示，在最佳条件下，光照时间为 80 min、转速为 225 rpm、溶液流速为 0.6 L/min、曝气率为 20 L/min、pH 值=6 和初始 AMX 浓度为 20 mg/L 时，可实现最大 AMX 光降解 (97.91%)。有趣的是，在 80 min 的光照时间内，最佳条件下可去除超过 79%的 COD 和 64%的 TOC。活性物种测试证实了·OH 和·O 在 AMX 降解中的主要作用。最后，XRD 图谱证实了异质结薄膜的可重复使用评估能够成功保留其在六个连续光催化降解运行中的稳定性。这项工作证明了利用可见光驱动的薄膜光催化剂在处理顽固抗生素污染物方面在旋转盘光反应器中的可行性。
