壳聚糖Pb^(2+)螯合吸附剂的性能表征  

Characterization of lead ions imprinting chitosan chelating adsorbents

作　　者：程爱华[1] 冯利凡[1] 畅飞[1] 赵丹[1] 刘哲[1] 

机构地区：[1]西安科技大学地质与环境学院,西安710054

出　　处：《环境工程学报》2015年第8期3597-3601,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51278418);陕西省工业攻关计划资助项目(2013GY2-06);陕西省教育厅专项科研计划资助项目(2013JK0893)

摘　　要：用先印迹和后印迹方法制备了2种壳聚糖Pb2+螯合吸附剂(Pb-TMCS和TMCS-Pb),考察了吸附剂对Pb2+的吸附性能。利用扫描电镜(SEM)、X射线衍射(XRD)、傅里叶红外光谱(FT-IR)和X射线能谱仪(EDS)对吸附前后的PbTMCS,TMCS-Pb及壳聚糖(CS)分别进行形貌、结构及组成的表征。结果表明,与TMCS-Pb和CS相比,先印迹方法制备的Pb-TMCS对Pb2+的吸附容量最大,可达45.38 mg/g;表面更加粗糙;包覆了磁性物质Fe3O4,具有磁性,能够迅速从吸附后的溶液中分离出来;对Pb2+的吸附机理是—NH2、—OH和C S与Pb2+发生了螯合反应;先印迹能留下更多印迹空穴,对Pb2+的吸附选择性更好。Two lead ions imprinting chitosan chelating adsorbents（Pb-TMCS and TMCS-Pb）were prepared by imprinting lead ions before and after modifieding magnetic crosslinking chitosan. Adsorption capacity of lead ions onto adsorbents were studied. The morphology, structure and chemical composition characteristics of Pb- TMCS/ TMCS-Pb/ CS before and after adsorption of Pb^2＋ were characterized by Scan electron microscopy （SEM） , X-ray diffraction（XRD） , Fourier-transformed infrared spectroscopy （FTIR） and X-ray energy disper- sive spectroscopy（EDS）. Results showed that compared with TMCS-Pb and CS, Pb-TMCS showed higher adsorp- tion capacity（45.38 mg/g）. The rough surface of Pb-TMCS increased the specific surface. --NH2 groups, --OH groups and C = S groups of Pb-TMCS participated in the chelating reaction. Imprinting lead ions at first led more imprinting cavities and had more selective adsorption ability.

关 键 词：壳聚糖 螯合吸附剂 铅离子 印迹 吸附 

分 类 号：O647.33[理学—物理化学]