摘要
采用水热合成法将Mn O_2包覆于纳米Fe_3O_4的表面,制备出纳米Mn O_2/Fe_3O_4,并将其用于含镉溶液的吸附。考察了吸附效果的影响因素,并研究了纳米Mn O_2/Fe_3O_4的重复使用性能。实验结果表明:在初始镉离子质量浓度为10 mg/L、吸附剂投加量为4 g/L、吸附温度为20℃、溶液p H为6.0、吸附时间为12 h的条件下,镉离子去除率由使用纳米Fe_3O_4时的3%增至使用纳米Mn O_2/Fe_3O_4时的96%;在初始镉离子质量浓度为50 mg/L、纳米Mn O_2/Fe_3O_4投加量为4 g/L、吸附温度为20℃、溶液p H为6.0、吸附时间为1 h的条件下,镉离子去除率达78%,吸附量为9.7 mg/g;经5次重复使用后,纳米Mn O_2/Fe_3O_4对镉离子的去除率仅比首次使用时降低了10百分点,具有良好的重复使用性能。
MnO2 was loaded on the surface of nano-Fe304 by hydrothermal synthesis method to prepare nano MnO2/Fe304, which was used for adsorption of cadmium from solution. The factors affecting adsorption were investigated, and the reuse performance of nano MnO2/Fe304 was researched The experimental results show that： Under the conditions of initial cadmium ion mass concentration 10 mg/L, adsorbent dosage 4 g/L, adsorption temperature 20 ℃, solution pH 6 and adsorption time 12 h, the removal rate of cadmium ion is increased from 3% on nano-Fe304 to 96% on nano MnO2/Fe3O4; Under the conditions of initial cadmium ion mass concentration 50 mg/L, nano MnO2/Fe3O4 dosage 4 g/L, adsorption temperature 20 ℃, solution pH 6 and adsorption time 1 h, the removal rate of cadmium ion is 78%, and the adsorption capacity is 9.7 mg/g; After 5 times of reuse, the removal rate of cadmium ion on nano MnO2/Fe3O4 is only reduces by 10 percentage point compared with that at the first use.
出处
《化工环保》
CAS
CSCD
北大核心
2016年第3期263-267,共5页
Environmental Protection of Chemical Industry
基金
国家自然科学基金项目(51168013
51468016)
江西省自然科学基金项目(20132BAB203033)
江西省科技支撑计划项目(2009AE01601)
江西省研究生创新专项(YC2014-S251)
河北省科技支撑计划项目(15273628)
