纳米Fe_3O_4/MnO_2对镉的吸附及其机理研究  

Adsorption on Cadmium by Nano-Fe_3O_4/MnO_2 and Its Adsorption Mechanism

作　　者：戴红玲[1] 叶鑫[1] 向来 占鹏[1,3] 鲁秀国[1] 刘占孟[1] 

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]天津诚泰来环境工程设备有限公司,天津300400 [3]江西水利职业学院水利工程系,江西南昌330013

出　　处：《中国给水排水》2016年第21期81-85,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51168013;51468016);国家科技支撑计划项目(2014BAC04B03);江西省自然科学基金资助项目(20132BAB203033);江西省科技厅支撑计划项目(2009AE01601);江西省研究生创新专项资金资助项目(YC2014-S251)

摘　　要：通过水热法制备的纳米Fe_3O_4/MnO_2是一种新型重金属吸附剂,利用其吸附含镉溶液的试验结果表明,纳米Fe_3O_4/MnO_2相较于前驱物的吸附效果有很大的改善。当镉浓度为10mg/L时,在相同试验条件下纳米Fe_3O_4、MnO_2、Fe_3O_4/MnO_2对镉的去除效率分别为3.3%、63%和96%。纳米Fe_3O_4/MnO_2吸附剂可通过外界磁场作用进行固液分离,解吸方便,重复利用率高。扫描电镜(SEM)分析显示,相比于纳米Fe_3O_4,纳米Fe_3O_4/MnO_2的粒径明显减小且颗粒增多,接触面积增大;红外光谱分析表明,在包覆MnO_2后纳米Fe_3O_4/MnO_2表面结构及组分发生了改变,生成了新的物相。纳米Fe_3O_4/MnO_2对镉离子的吸附过程符合伪二级动力学方程,R2达到0.999 8。Nano-Fe3O4/MnO2 prepared by hydrothermal method is a new adsorbent of heavy metal ions. Experiments for adsorption of cadmium-containing solution were performed using this adsorbent. A series of adsorption experiments showed that compared with precursors, the adsorption behavior of nano- Fe3O4/MnO2 was significantly improved. When the concentration of cadmium was 10 rag/L, under the same experiment conditions, the removal rates of cadmium by nano-Fe3 O4/MnO2, nano-Fe3O4 and MnO2 were 96%, 3. 3% and 63%, respectively. Nano-Fe3O4/MnO2 could achieve solid-liquid separation through outside magnetic field effect, with convenient desorption and high repeated utilization rate. The SEM analysis showed that nano-Fe3 O4/MnO2 had less particle size, more particle and more contact area than nano-Fe3O4. FT-IR analysis showed that after coating MnO2, the surface structure and composition of nano-Fe3O4/MnO2 changed to generate new phase. Adsorption process of cadmium ions by nano-Fe3 04/MnO2 followed the pseudo-second-order equation, and the R2 reached 0.999 8.

关 键 词：重金属 吸附 镉 纳米Fe304/Mn02 

分 类 号：X703[环境科学与工程—环境工程]