铈负载活性炭降解印染废水的实验研究

Degradation of Simulated Dyeing-Printing Wastewater by Cerium Supported Activated Carbon

选取活性艳蓝(KN-R)为模式污染物配制模拟印染废水,绘制模拟印染废水标准曲线,以此为依据计算不同反应条件下的KN-R吸附量。用浸渍法将稀土金属铈负载在活性炭上来提高其对模拟印染废水的处理效率,分别考察了负载量、吸附时间、活性艳蓝的初始浓度、pH值等因素对降解效果的影响。根据实验结果得出结论:吸附时间越长效果越好;金属铈(Ce)负载活性炭更适合处理低浓度的模拟印染废水;pH为5时降解效果较好;金属Ce的最佳负载率为8wt%。使用X射线衍射分析仪和X射线荧光光谱仪对金属Ce最佳负载率时的活性炭分别进行了表征,XRF和XRD分析结果说明铈成功地以立方晶型的形式均匀地分散在活性炭之中。

Cerium(Ce)supported activated carbon(AC)was made by dipping method to increase the processing efficiency for the simulated dyeing-printing wastewater,which was prepared by KN-R asmodel contamination. The standard curve of dyeing-printing simulation wastewater was created to calculate the mass concentration of KN-R according to the absorbency,and it could be used as the measure-ment index of degradation effect. The effects of the loading amounts,adsorption time,initial concentra-tion of KN-R,pH value on degradation were examined. According to the experimental results,it canbe concluded as follows:the longer the adsorption time was,the better degradation effect would be;thecerium supported activated carbon was more suitable to treat the dyeing-printing simulation wastewaterwithin a low certain range;the degradation effect of KN-R was better when the pH value was 5;the op-timum loading ratio of cerium was 8 wt%. AC and Ce supported AC at optimum loading ratio were characterized by XRF and XRD,respectively. It was found that Ce was loaded on the surface of AC and distributed evenly in the form of cubic crystal.