Abstract

Tetracycline was removed by the photocatalytic process. To this end, the improved photocatalyst of TiO₂/N/S was synthesized and utilized. The process was performed in a bench-scale reactor and the catalyst was activated by ultraviolet irradiation. The catalyst was synthesized by the sol-gel method with the size of ∼45 nm and characterized by TEM, SEM, BET, XRD, and EDS analyses. The effective parameters of tetracycline initial concentration, catalyst dosage, initial pH, and process time were statistically optimized by Design Expert software. The concentration of tetracycline was monitored by HPLC analysis and the removal efficiency was used to optimize the process. The results showed that in the optimum condition of [Cat.] = 1.3 g/L, pH = 5.7, [Tet.] = 25 mg/L, and t = 62 min, the process can remove tetracycline by ∼92%. The kinetic study of the process was also performed and the data were fitted by the pseudo-first-order kinetic model. Finally, the performance of the catalyst in the real wastewater treatment was evaluated and the results showed the process can remove tetracycline in hospital wastewater by ∼79%.

摘要

通过光催化过程去除四环素。为此，改进的 TiO _{2光催化剂}/N/S 被合成和利用。该过程在实验室规模的反应器中进行，并通过紫外线照射活化催化剂。该催化剂采用溶胶-凝胶法合成，粒径约为 45 nm，并通过 TEM、SEM、BET、XRD 和 EDS 分析对其进行了表征。通过Design Expert软件对四环素初始浓度、催化剂用量、初始pH和工艺时间的有效参数进行了统计优化。通过 HPLC 分析监测四环素的浓度，并使用去除效率来优化工艺。结果表明，在[Cat.] = 1.3 g/L、pH = 5.7、[Tet.] = 25 mg/L、t = 62 min的最佳条件下，该工艺对四环素的去除率约为92%。还进行了该过程的动力学研究，并通过准一级动力学模型拟合数据。最后，