Au-Pd@CNSs/SiO_(2)复合材料的制备及其催化废水处理研究

Preparation of Au-Pd@CNSs/SiO_(2) Composites and Treatment of Catalytic Wastewater

本文通过一步水热法制备出不同双贵金属Au-Pd负载量的Au-Pd@CNSs/SiO_(2)复合材料,并通过TEM和SEM对该复合材料的微观和宏观形貌结构进行表征。用不同浓度的甲基橙溶液模拟印染污水,研究了Au-Pd负载量、催化剂和NaBH4添加量、甲基橙起始浓度等对催化降解速率的影响,并对复合材料的回收再利用性能进行考察。从实验结果可知,所制备的Au-Pd@CNSs/SiO_(2)复合材料具有比较均匀的球形形态,有较大的比表面积和孔道体积。当甲基橙起始质量浓度不大于1.5 mg/mL时,其催化降解率可达到96.5%。且Au-Pd@CNSs/SiO_(2)复合材料在循环使用10次时,其催化降解率仍可达到85%以上。

In this paper,Au-Pd@CNSs/SiO_(2) composites with different double precious metals Au-Pd loading capacities were prepared by one-step hydrothermal method.The microstructure and microstructure of the composites were characterized by TEM and SEM.The effects of the loading capacity of Au-Pd,the addition amount of catalyst and Na BH4,and the initial concentration of methyl orange on the catalytic degradation rate were studied by simulating printing and dyeing wastewater with methyl orange solution of different concentrations.It can be seen from the experimental results that the prepared Au-Pd@CNSs/SiO_(2) composite has a relatively uniform spherical shape,and has a large specific surface area and pore volume.When the initial concentration of methyl blue is less than 1.5 mg/m L,the catalytic degradation rate can reach 96.5%.And the catalytic degradation rate of Au-Pd@CNSs/SiO_(2) composite can still reach more than 85% when it is recycled for10 times.