氨基修饰的MCM-41和纯MCM-41的微波制备及去除废水中铜离子的研究  

Study on microwave preparation of amino-modified MCM-41 and pure MCM-41 and the application for removal of copper ions from wastewater

作　　者：曹渊[1] 李创举[1] 黄秋燕[1] 魏红娟[1] 

机构地区：[1]重庆大学化学化工学院,重庆400030

出　　处：《环境工程学报》2011年第6期1315-1320,共6页Chinese Journal of Environmental Engineering

基　　金：中国博士后科学基金(20080440696);"211工程"三期建设(S-09103);重庆大学研究生创新基金项目(201005A1A0010332)

摘　　要：采用微波辅助水热法一步合成了具有大比表面积和孔径的氨基改性的MCM-41(NH2-MCM-41)和纯MCM-41,并用粉末X射线衍射、红外、氮气-吸脱附对其结构作了表征。将NH2-MCM-41和纯MCM-41用于吸附废水中的铜离子,其静态吸附实验表明:吸附量随温度的增加略有升高;铜离子在2种吸附剂上的吸附均符合Langmuir型等温吸附线;且吸附的动力学特征均是准一级反应;吸附达到平衡的时间均很短,NH2-MCM-41和纯MCM-41的半衰期分别为2.40 min和2.37 min;吸附剂的再生能力好。氨基改性的MCM-41的吸附量明显高于纯MCM-41的吸附量,前者为28.09 mg/g,后者为17.54 mg/g。通过动态吸附,证明了2种吸附剂均能用于微量重金属离子的富集。最后,简单讨论了氨基改性的吸附剂的再生机制。The modified mesoporous silica with amino group（NH2-MCM-41）and pure mesoporous silica（MCM-41）with lager specific surface area and pore size were synthesized via the microwave-assisted hydrothermal one step method.The samples were characterized by X-ray diffraction,FT-IR spectroscopy and nitrogen adsorption-desorption.Then adsorption test of copper ion was investigated,with respect to temperature and time.Langmuir model is favorable to describe the adsorption kinetics.Results indicate that maximum adsorption amounts of the modified silica and pure silica are 28.09 mg/g and 17.54 mg/g,respectively.Furthermore,the samples could be utilized for enrichment the trace metal,which was testified by dynamic adsorption experiment.At last,the regeneration mechanism of NH2-MCM-41 was discussed briefly.

关 键 词：介孔二氧化硅 氨基 铜离子 吸附 动态 

分 类 号：X131.2[环境科学与工程—环境科学]