氨基改性纤维素气凝胶吸附Pb^(2+) 的研究  

Adsorption Behavior of Pb^(2+) on Amino-modified Cellulose Aerogel

作　　者：李琦琪 杨桂芳[1] 刘以凡[1,2] 刘明华 LI Qi-qi;YANG Gui-fang;LIU Yi-fan;LIU Ming-hua(College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Provincial Technology Exploitation Base of Biomass Resources,Fuzhou 350108,China)

机构地区：[1]福州大学环境与安全工程学院,福建福州350108 [2]福建省生物质资源化技术开发基地,福建福州350108

出　　处：《纤维素科学与技术》2022年第1期34-46,共13页Journal of Cellulose Science and Technology

基　　金：国家自然科学基金项目(21577018)。

摘　　要：以纤维素为原料,聚乙烯亚胺为氨基化试剂,选用环氧氯丙烷作为交联剂,制备了氨基改性纤维素气凝胶(Cell@PEI)。通过傅里叶红外光谱分析(FT-IR)、扫描电子显微镜分析(SEM)、X-射线衍射分析(XRD)和比表面积分析(BET)等表征手段对制得的吸附剂进行表征分析,证明成功制得了具有三维立体网状结构的氨基改性纤维素气凝。动力学吸附实验表明,Cell@PEI吸附Pb^(2+) 的过程以化学吸附为主导,遵循准二级动力学,在240min内可以达到吸附平衡。等温吸附实验结果表明,该吸附过程主要为单层吸附,吸附过程是吸热反应。此外,由等温拟合结果可知,在室温条件下,Cell@PEI对Pb^(2+) 的饱和吸附容量为179.4 mg/g。Cell@PEI经过四次再生后,仍保持初始吸附量81.33%的吸附量,表明该吸附剂具有良好的循环使用性能。Amino-modified cellulose aerogel(Cell@PEI)was prepared using cellulose as raw material with polyethyleneimine as amino agent and epichlorohydrin as crosslinking agent.XRD,FESEM,FT-IR,and BET were used to prove that the amino-modified cellulose aerogel with good pore structure was successfully synthesized.Kinetic adsorption experiments showed that the adsorption can reach equilibrium in 240 min.Chemisorption dominated the adsorption process of Cell@PEI for Pb^(2+) ,and the adsorption process followed quasi-second-order kinetics.The isothermal adsorption experiments showed that the adsorption of Pb^(2+) on Cell@PEI was mainly monolayer adsorption,and the adsorption process was endothermic reaction.It can be seen from the results of isothermal fitting that the saturated adsorption capacity of Cell@PEI for Pb^(2+) is 179.4 mg/g at room temperature.After four regenerations,Cell@PEI still maintained 81.33%of the initial adsorption capacity.

关 键 词：纤维素 气凝胶 吸附 聚乙烯亚胺 铅离子 

分 类 号：TQ352[化学工程]