摘要
以壳聚糖为原材料,通过原位共沉淀法和柠檬酸钠交联法制备了一种新型多孔磁性壳聚糖凝胶微球吸附剂CS-citrate/Fe3_O_4.利用扫描电镜(SEM)、透射电镜(TEM)、傅里叶红外光谱(FTIR)、热重分析(TG)对吸附剂进行了表征.结果表明,吸附剂内部具有发达的孔隙结构,并均匀分布有平均直径为(4.79±1.09)nm的Fe3_O_4纳米颗粒;吸附剂中引入Fe3_O_4后,仍存在羟基、氨基和羧基等功能基团,且吸附剂磁性良好可用于磁场分离;吸附剂对Pb(II)的吸附等温线和动力学研究表明,吸附过程以化学吸附为主,最大吸附容量可达178.25mg/g.
In this study,the magnetic porous chitosan hydrogel microsphere was fabricated by a combination of in situ-coprecipitation and sodium citrate crosslinking technique using chitosan as raw material.The scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FTIR)and thermogravimetric analysis(TG)were conducted for the characterization of this novel adsorbent.The hydrogel microsphere present a well developed porous inner structure and the Fe3O4nanoparticles with an average diameter of(4.79±1.09)nm dispersed uniformly.The functional group of chitosan,the hydroxyl,amino and carboxyl groups,remained after the introduction of the Fe3O4,and the magnetic adsorbent could be separated by the addition of external magnetic field.The adsorption isotherm and kinetic study for the Pb(Ⅱ)removal from the aquatic environment indicating that the adsorption process was dominated by the chemical adsorption and the maximum adsorption capacity was calculated as 178.25mg/g.
作者
蒲生彦
王可心
马慧
杨曾
候雅琪
陈虹宇
PU Sheng-yan;WANG Ke-xin;MA Hui;YANG Zeng;HOU Ya-qi;CHEN Hong-yu(State Key Laboratory of Geological Prevention and Geological Environment Protection,Chengdu University of Technology,Chengdu 610059,China;State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution,Chengdu University of Technology,Chengdu 610059,China;epartment of Civil and Environment Engineering,The Hong Kong Polytechnic University,Hong Kong,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第4期1364-1370,共7页
China Environmental Science
基金
国家自然科学基金资助项目(51408074,41772264)
关键词
多孔结构
生物质吸附剂
磁性壳聚糖
凝胶微球
重金属
porous structure
biomass adsorbent
magnetic chitosan
hydrogel microsphere
heavy metal
