硅藻土/BiOBr光催化降解四环素废水研究

Study on Photocatalytic Degradation of Tetracycline Wastewater by Diatomite/BiOBr

利用简单的溶解热法成功制备了硅藻土(DT)/BiOBr复合光催化剂,对其形貌和成分进行了表征。对复合光催化剂降解废水中四环素的性能和催化剂的稳定性进行了试验。结果表明:BiOBr纳米片在硅藻土表面分散均匀,材料纯度高、结晶性好;DT/BiOBr-1的光催化性能最好,100 min内降解四环素的效率达到95.1%,重复使用4次后依旧保持较高的催化活性。光催化降解反应中的活性物种主要是羟基自由基和光生空穴,同时超氧自由基也起到了一定的作用。

The diatomite(DT)/BiOBr composite photocatalyst was successfully prepared by a simple solution heat method,and its morphology and composition were characterized.The performance and stability of composite photocatalyst for degradation of tetracycline in wastewater were tested.The results show that BiOBr nanosheets are uniformly dispersed on the surface of diatomite with high purity and good crystallinity.DT/BiOBr-1 had the best photocatalytic performance,and the efficiency of tetracycline degradation reached 95.1%within 100 min,and the catalytic activity remained high after repeated use for 4 times.The active species in photocatalytic degradation are mainly hydroxyl radicals and photogenerated holes,while superoxide radicals also play a certain role.