La掺杂BiPO4光催化降解亚甲基蓝模拟染料废水的试验研究

摘要

La- doped BiPO4 was fabricated via a facile hydrothermal process, which was used as photocat⁃alyst for degrading 7.5 mg/L of simulated methylene blue dye wastewater under the UV light. The effects of the dosage of catalyst, pH of the solution, inorganic anions, and cycle times of catalyst on the photocatalytic efficiency were studied. The results indicated that the degradation efficiency of methylene blue in 90 min reached 95% under il umination of ultraviolet lamp, while the amount of La- doped BiPO4 nanoparticles was 1.0 g/L, and solution pH was 7. The presence of SO42- and PO43- had an inhibitory effect on the photocatalytic degradation of MB. The photocatalyst showed good photocatalytic property and stability after 4 cycles.%采用水热合成法制备了La掺杂BiPO4纳米粉末，使用该光催化剂在紫外光下对亚甲基蓝质量浓度为7.5 mg/L的模拟废水进行了光催化降解试验。考察了催化剂用量、溶液pH、无机阴离子和催化剂循环使用次数对光催化降解效果的影响。结果表明：在pH=7，光催化剂用量为1.0 g/L的条件下，用紫外杀菌灯照射90 min，La掺杂BiPO4对亚甲基蓝的降解率可达95%；SO42-、PO43-的存在对光催化降解具有抑制作用；该催化剂循环使用4次仍具有良好的光催化性能，且稳定性较好。