含磺酸钠聚合物微凝胶的制备及对Cu(II)和Pb(II)的吸附  

Preparation of Sodium Sulfonate-Containing Polymer Microgel for Cu(II)and Pb(II)Adsorption

作　　者：邓文谨 姚晨曦 林文波 张家豪 彭学文 张春燕[2] 罗建新[1] DENG Wenjin;YAO Chenxi;LIN Wenbo;ZHANG Jiahao;PENG Xuewen;ZHANG Chunyan;LUO Jianxin(School of Material Science and Engineering,Hunan Institute of Technology,Hengyang 421002,China;School of Chemical and Environment Engineering,Hunan Institute of Technology,Hengyang 421002,China)

机构地区：[1]湖南工学院材料科学与工程学院,湖南衡阳421002 [2]湖南工学院化学与环境工程学院,湖南衡阳421002

出　　处：《塑料工业》2023年第11期170-179,共10页China Plastics Industry

基　　金：国家自然科学基金(21802039);湖南省自然科学基金(2023JJ50113);湖湘青年科技创新人才项目(2020RC3055);国家级大学生创新创业训练计划项目(S202311528047);湖南省大学生创新创业训练计划项目(湘教通[2023]237号);衡阳市科技计划项目(202150063362)。

摘　　要：采用回流-沉淀聚合制备了含磺酸钠聚合物微凝胶(SSPMg),通过扫描电子显微镜(SEM)、比表面及孔隙度分析(BET)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)等对其结构性能和化学组成进行了表征,并考察了SSPMg对Cu(II)和Pb(II)的吸附性能。结果表明,对苯乙烯磺酸钠占共聚单体总质量17.5%的微凝胶(SSPMg-4)在pH值=5时吸附效果最佳;吸附过程更符合准二级动力学和Langmuir等温吸附模型,以单分子层的化学吸附为主,包括络合、离子交换和静电吸附作用;吸附过程ΔG小于0、ΔH大于0,表现为常温下的自发吸热过程。298.15 K时,SSPMg-4对Cu(II)和Pb(II)的Langmuir理论最大吸附量分别达523.56 mg/g和568.18 mg/g。经过6次循环使用后,SSPMg-4对Cu(II)和Pb(II)的去除率保持在初始去除率的92%以上。Sodium sulfonate-containing polymer microgel(SSPMg)was prepared by reflux-precipitation polymerization.The structure,properties and chemical composition of the obtained microgel were characterized by scanning electron microscope(SEM),surface area and porosity analyzer(BET),Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).The adsorption performance of Cu(II)and Pb(II)by SSPMg were investigated.The results indicate that the adsorption effect of SSPMg-4 containing sodium p-styrenesulfonate accounting for 17.5%of the total mass of the comonomer,is the best at pH=5.The adsorption process is in accordance with pseudo second-order kinetic model and Langmuir isotherm model,indicating that the adsorption process of SSPMg for Cu(II)and Pb(II)is mainly attributed to the chemisorption of single-molecule layer.The adsorption mechanism includes complexation,ion exchange,and electrostatic adsorption.Adsorption processΔG is less than 0,ΔH is greater than 0,indicating that the adsorption process is a spontaneous endothermic process at normal temperature.At 298.15 K,the Langmuir theoretical maximum adsorption capacities of SSPMg-4 for Cu(II)and Pb(II)reaches 523.56 and 568.18 mg/g,respectively.After 6 cycles of recycling,the removal rate of Cu(II)and Pb(II)by SSPMg-4 remains above 92%of the initial.

关 键 词：微凝胶 磺酸钠 回流-沉淀聚合 重金属 吸附 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]