摘要
该文以绿色环保的低共熔单体为溶剂,采用前端聚合法制备了一种氢氧化镧大孔水凝胶(PAM-LH水凝胶),并探讨了PAM-LH水凝胶对磷的吸附效果及机理。结果表明,当PAM-LH水凝胶中氢氧化镧含量为5%(w)时,磷的吸附效果最佳,吸附容量达19.45 mg/g。Langmuir等温吸附方程拟合结果较好(p<0.01),表明PAM-LH水凝胶对磷的吸附主要以单分子层吸附为主;吸附动力学方程拟合结果表明,内扩散过程为PAM-LH水凝胶对磷吸附速率的主要限制因子。SEM扫描电镜、红外光谱、能谱分析表明,PAM-LH水凝胶的吸附机理是以化学吸附为主。
Polyacrylamide composite hydrogel containing lanthanum hydroxide(PAM-LH hydrogel)was prepared in the laboratory by means of an environmentally friendly frontal polymerization technology.The experiment of phospho⁃rus adsorption onto PAM-LH hydrogel was carried out and the efficiency of PAM-LH hydrogel for adsorption of phosphorus as well as the mechanism were discussed.The experiment showed that when the content of lanthanum hydroxide in the PAM-LH hydrogel was 5%(w),phosphorus adsorption efficiency was the best,with the maximum adsorption capacity of 19.45 mg/g.This adsorption a little bit well fit the Langmuir isotherm adsorption equation(p<0.01),indicating that the adsorption process of the lanthanum hydroxide macroporous hydrogel for phosphorus mainly belonged to monolayer adsorption,and that adsorption kinetic equation fitting results showed that the inter⁃nal diffusion process was the major limiting factor affecting the phosphorus adsorption rate of lanthanum hydroxide macroporous hydrogel.Additionally,SEM scanning electron microscopy,infrared spectrum analysis and energy spec⁃trum analysis revealed that the adsorption mechanism of lanthanum hydroxide macroporous hydrogel was mainly attributed to chemical adsorption.
作者
熊承旺
段宁
陶敏
韩志强
李胜方
肖文胜
XIONG Chengwang;DUAN Ning;TAO Min;HAN Zhiqiang;LI Shengfang;XIAO Wensheng(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;School of Environmental Science and Engineering,Hubei Key Lab of Mine Environmental Pollution Control&Remediation,Hubei Polytechnic University,Huangshi 435003,China;Huangshi Huli Research Institute of Environmental Protection&Energy Saving Industrial Technology,Huangshi 435003,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第9期58-63,共6页
Environmental Science & Technology
基金
湖北省自然科学基金面上项目(2018CFB778)
矿区环境污染控制与修复湖北省重点实验室开放基金项目(2017107)。
关键词
氢氧化镧
大孔水凝胶
磷
化学吸附
前端聚合
lanthanum hydroxide
macroporous hydrogel
phosphorus
chemical adsorption
frontal polymerization
