稀土La~(3+)掺杂Bi_2WO_6光催化降解活性艳红X-3B的研究

采用水热合成法制备稀土元素La3+掺杂Bi2WO6光催化剂并考察其对染料废水中活性艳红X-3B的光催化活性.通过X射线衍射、场发射扫描电镜、紫外-可见漫反射光谱、N2物理吸附-脱附等手段对合成材料的结构、形貌、光吸收等物理化学性能进行表征.结果表明,La3+掺杂量为5%时,其结晶度好、颗粒均匀、具有较强的可见光吸收性能,且比表面积比纯Bi2WO6提高30%以上,对X-3B的去除效果最好.另外,催化剂投加量、X-3B初始浓度、反应溶液p H等因素对La3+掺杂Bi2WO6光催化降解X-3B均有重要影响.

Investigation of X-3B photocatalytic degradation by La3+ doped Bi2WO6

Rare earth element La3+ doped Bi2WO6 (La/Bi2WO6) was synthesized by hydrothermal method. Reactive brilliant red X-3B was used to as the objective pollutant to investigate the photocatalytic activity of La/Bi2WO6. The physicochemical properties of prepared materials were characterized by XRD, FESEM, UV-vis DRS and N2adsorption-desorption. As a result, La/Bi2WO6(5%) had the optimum photocatalytic activity to X-3B, which had good crystalinity, uniform particles, strong visible litght-responsible property and the higher SBET value with above 30% than pure Bi2WO6. Besides, the factors of the dosage of catalyst, initial concentration of X-3B, and pH values of the reaction solution all played important role on X-3B removal by La/Bi2WO6.