复合纳米Pd-nZVI／GAC材料制备及其降解亚甲基蓝研究  

Preparation of Composite Nano Pd-nZVI/GAC Materials and Study on the Degradation of Methylene Blue

作　　者：李海华[1] 孟瑞静[1,2] 赵颖[2] 龚斌[2] 李晓光[2] 王晓伟[3] 

机构地区：[1]华北水利水电大学环境与市政工程学院,河南郑州450011 [2]中国环境科学研究院,国家环境保护地下水污染模拟与控制重点实验室,北京100012 [3]中国铁道科学研究院节能环保劳卫研究所,北京100081

出　　处：《水处理技术》2016年第11期18-23,共6页Technology of Water Treatment

基　　金：“十二五”国家科技支撑计划课题(2012BAJ21B04)

摘　　要：采用浸渍-液相还原-还原沉淀法制备负载型的复合Pd-n ZVI/GAC材料,利用扫描电镜(SEM)、氮吸附比表面积孔径测定仪(BET)对材料进行表征,以亚甲基蓝为目标污染物,考察复合Pd-n ZVI/GAC材料的化学性能。结果表明,纳米Fe(n ZVI)和Pd负载质量分数分别为5%和0.3%时,亚甲基蓝去除效果最好。当亚甲基蓝初始质量浓度为100 mg/L、材料投加量为0.5 g/L条件下,反应10 min后,亚甲基蓝的去除率高达到93.17%;降解动力学数据表明,复合Pd-n ZVI/GAC对亚甲基蓝的降解过程符合1级反应动力学规律,表观速率常数k随着亚甲基蓝的初始含量的增大而减小。In this study, supported composite Pd-nZVI/GAC materials were successfully synthesized through impregnation-liquid phase reduction- reducfive deposition method, and the degradation ability to themodel pollutant of methylene blue （MB） was tested with. The morphologies, properties and reactivity of the as-prepared clay supported nZVIs were further analyzed using a series of characterization techniques such as scanning electron microscope （SEM） and BET. The results indicated that optimal degradation efficiency could be reached when the mass fraction Fe and Pd loading was 6% and 0.3%, respectively. 93.17% of MB was removed after 10 min using Pd-nZVI/GAC material at initial mass concentration of 100 mg/L and dosage of 0.5 g/L; The kinetics depicted that the degradation process of MB fitted well the first order reaction kinetics, and the rate constant decreased with the increasing of initial concentration of MB.

关 键 词：复合纳米Pd-nZVI/GAC 偶氮染料 去除率 影响因素 

分 类 号：TQ424.1[化学工程]