TiO2-Ag3PO4光催化剂的制备及其紫外光催化性能

摘要

采用化学沉淀法（两步法）制备了TiO2-Ag3PO4复合光催化剂，考察了该光催化剂紫外光催化降解阳离子染料番红花红T（简称ST）的性能。实验结果表明：在TiO2-Ag3PO4投加量0.7 g/L、初始ST质量浓度70 mg/L、不调节溶液pH的条件下，紫外光照射35 min时的ST降解率高达97.9%；TiO2-Ag3PO4复合光催化剂的光催化性能明显优于单一光催化剂Ag3PO4和TiO2，同时也明显优于Ag-AgCl/Ag3PO4复合光催化剂；避光条件下反应40 min， TiO2-Ag3PO4对ST的吸附量仅为2.3 mg/g；TiO2-Ag3PO4在室内自然光下也具有一定的光催化活性；TiO2-Ag3PO4的光催化活性在酸性条件下要优于碱性条件；TiO2-Ag3PO4重复使用5次后，其光催化活性无明显下降，稳定性较好。%The TiO2-Ag3PO4 composite photocatalyst was prepared by chemical precipitation method(two-step method), and its photocatalytic activity under UV light to degradation of safranine T(ST)cationic dye was explored. The experimental results show that:Under the conditions of TiO2-Ag3PO4 dosage 0.7 g/L,initial ST mass concentration 70 mg/L,without pH adjustment and UV irradiation time 35 min,the degradation rate of ST is up to 97.9%;The photocatalytic activity of TiO2-Ag3PO4 is obviously higher than that of single photocatalyst Ag3PO4 and TiO2,and also Ag-AgCl/Ag3PO4 composite photocatalyst;The adsorption capacity of ST is only 2.3 mg/g after dark reaction for 40 min;TiO2-Ag3PO4 also has photocatalytic activity under indoor natural light;The photocatalytic activity of TiO2-Ag3PO4 in acidic condition is better than that in alkaline condition;TiO2-Ag3PO4 is stable with same photocatalytic activity after 5 times of reuse.