【摘要】 目的探讨钡掺杂钨酸铋(钡-钨酸铋)可见光光催化对盐酸四环素(TCH)的降解特性。方法采用水热法制备钡-钨酸铋可见光光催化剂,研究不同钡掺杂量(钡与铋物质量的比为1∶10~3∶20)时钨酸铋催化剂对TCH的降解效果,同时,考察催化剂投加量(0.2~2.0 g/L)、TCH初始浓度(10~50 mg/L)、溶液初始p H值(3~11)、过氧化氢投加量(1~3 ml)时,钡-钨酸铋可见光催化反应在150 min内对TCH降解性能的影响。通过连续4次重复使用实验评价催化剂的稳定性能。结果钡与铋物质量的比为3∶20时,制备的催化剂表现出了最优的可见光光催化活性。在优化的光催化反应条件(TCH初始浓度为20 mg/L、p H 6.8、催化剂投加量为0.5 g/L)下,钡-钨酸铋对TCH的去除率高达90%以上。另外,投加过氧化氢可加快TCH的降解速率,改性催化剂有良好的稳定性能。结论钡-钨酸铋催化剂可显著提高对TCH的可见光光催化降解效能,具有一定的实际应用价值。更多还原

【Abstract】 Objective To understand the degradation characteristics of the tetracycline hydrochloride（TCH） by using bariumdoped tungsten acid bismuth（Ba-Bi₂WO₆） as the visible light photocatalyst. Methods Ba-Bi₂WO₆ photocatalyst was prepared by hydrothermal method and the degradation effect of TCH was evaluated by using Bi₂WO₆ photocatalyst doped with different levels of Ba（Ba and Bi mole ratio of 1 ∶10-3∶20）. Meanwhile,the influence of degradation characteristics of the tetracycline hydrochloride was analyzed at catalyst amounts（0.2-2.0 g/L）,initial concentration of tetracycline hydrochloride（10-50 mg/L）,initial p H（3-11） and H2 O2 amounts（1-3 ml） and the experiment was proceeded by the visible light photocatalyst of Ba-Bi₂WO₆ within 150 min. The stability of the catalyst was measured by four consecutive experiments. Results The modified catalyst prepared at mole ratio of 3∶20（Ba∶Bi） showed the best photocatalytic activity. Under the optimal condition of photocatalytic（the TCH concentration of 20 mg/L,p H 6.8,the catalyst dose of 0.5 g/L）,the ratio of TCH removal could reach 90%. In addition,H₂O₂ could accelerate the degradation rate of the TCH,and the modified catalyst presented good stability. Conclusion The investigated Ba-doped Bi₂WO₆ can greatly improve the visible photocatalytic degradation efficiency of TCH, which has certain practical value.更多还原