【摘要】 目的探讨负载于多孔海绵上银掺杂二氧化钛(Ag-二氧化钛)可见光光催化剂对盐酸四环素(TCH)的降解特性。方法以小型内循环流化床反应装置研究在不同光源(LED灯、紫外光灯和氙灯)、催化剂投加量(1.0~2.5 g/L)、TCH初始浓度(25~100 mg/L)和溶液初始p H值(3~11)时,负载型Ag-二氧化钛可见光催化反应在3 h内对TCH降解性能的影响。结果在不同光源条件下,TCH的降解呈表观一级反应,且表观速率常数在LED灯(42 W)为光源时最大。在优化的光催化反应条件(盐酸四环素初始浓度为50 mg/L,p H 5.2,催化剂投加量为2 g/L)下,负载Ag-二氧化钛对TCH的去除率高达92.1%。结论在本实验条件下,负载型Ag-二氧化钛于可见光下光催化处理抗生素类废水具有较好的降解效果,值得进一步深入讨论。更多还原

【Abstract】 Objective To understand the degradation characteristics of the tetracycline hydrochloride（TCH） by using silver-doped titanium dioxide（Ag-TiO₂） loading on porous sponge as the visible light photocatalyst. Methods The influence of degradation characteristics of the tetracycline hydrochloride was analyzed at different light source（LED） lamp,UV lamp and xenon lamp, catalyst amounts（1.0-2.5 g/L）, initial concentration of tetracycline hydrochloride（25-100 mg/L） and initial p H（3-11）, and the experiment was proceeded by the visible light photocatalyst of silver-doped titanium dioxide（Ag-TiO₂） loading on porous sponge, within 3 hours in a small internal circulating fluidized bed reaction device. Results Under the different light sources condition, the reaction kinetics of TCH degradation presented first order and the apparent rate constant was the maximum at LED lights（42 W） sources. Under the optimal condition of photocatalytic（the concentration of TCH=50 mg/L,p H=5.2, the dose of catalyst =2 g/L）,the ratio of TCH removal could reach at 92.1%. Conclusion In the present experimental condition,as a photocatalyst, Ag-TiO₂ presented better effect in the treatment of the wastewater containing antibiotics under visible light source,which deserves further study.更多还原