介孔α-MnO_2/蒙脱石复合材料对罗丹明B的催化降解性能

Preparation of Mesoporous α-MnO_2/Montmorillonite and Its Performance in Catalyzing Degradation of Rhodamine B

以高锰酸钾和硫酸锰为原料、修饰蒙脱石为载体,通过水热法制备介孔α-MnO_2和介孔α-MnO_2-蒙脱石复合材料(α-MnO_2/Al-Mt).采用X射线粉末衍射(XRD)、扫描电镜(SEM)及比表面(BET)等方法对制备材料进行表征.以0.15 g/L介孔α-MnO_2和介孔α-MnO_2/Al-Mt为催化剂,以初始质量浓度为100 mg/L的罗丹明B为模拟废水,研究了罗丹明B的降解动力学.结果表明:介孔α-MnO_2/Al-Mt对罗丹明B的降解效果是介孔α-MnO_2的2倍.3次重复实验后,α-MnO_2/Al-Mt的催化性能基本没有减弱,说明α-MnO_2/Al-Mt具有良好的循环稳定性.

Mesoporous α-MnO_2 and mesoporous α-MnO_2/montmorillonite composites( α-MnO_2/Al-Mt) were prepared in laboratory using KMnO_4 and MnSO_4 as raw materials and the modified montmorillonite as the carrier. The synthesized samples were characterized by XRD,SEM and BET. Rhodamine B degradation tests were carried out at the initial concentration of 100 mg/L and 0.15 g/L α-MnO_2 or mesoporous α-MnO_2/Al-Mt as catalyst. The degradation dynamics of Rhodamine B showed that α-MnO_2/Al-Mt had better performance than α-MnO_2 in catalyzing Rhodamine B degradation. After three recycles,α-MnO_2/Al-Mt did not exhibit any significant loss of catalytic activity,confirming the catalyst was stable.