松香基三烯丙酯交联聚合树脂的合成及其对水中Pb(Ⅱ)、Cd(Ⅱ)和Cu(Ⅱ)的吸附性能与机制  

Synthesis of a triallyl maleopimarate-acrylic copolymer resin and mechanisms for adsorption of Pb(Ⅱ),Cd(Ⅱ)and Cu(Ⅱ)from water

作　　者：张丹丹 刘绍刚 董慧峪[2] 赵芳[1] 王荣臻 刘雪虎 刘敏 刁开盛 ZHANG Dandan;LIU Shaogang;DONG Huiyu;ZHAO Fang;WANG Rongzhen;LIU Xuehu;LIU Min;DIAO Kaisheng(Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530008;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085)

机构地区：[1]广西民族大学化学化工学院,广西林产化学与工程重点实验室,南宁530008 [2]中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085

出　　处：《环境科学学报》2022年第3期162-175,共14页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.22166007,21976040,21667005,22166008);广西科技重大专项(No.桂科AA18118013);广西高等学校高水平创新团队及卓越学者资助计划(No.桂教人[2020]6号);广西区级大学生创新创业训练计划项目(No.20180608003,201810608004,201810608065,201810608039)。

摘　　要：以自制的松香基三烯丙酯(triallyl maleopimarate,TAMP)为交联剂,通过悬浮聚合法合成了一种松香基三烯丙酯交联聚合树脂(triallyl maleopimarate-acrylic copolymer,TAMPA),采用红外光谱(FTIR)、扫描电镜(SEM)、N_(2)吸附脱附曲线和热重(TG)分析等方法对其物理化学结构及热稳定性等进行表征,采用批量吸附实验探讨了TAMPA投加量、溶液pH、温度、接触时间和离子强度等因素对TAMP树脂对Pb(Ⅱ)、Cd(Ⅱ)和Cu(Ⅱ)重金属离子吸附性能的影响.结果表明,当pH值为2.0~5.0,TAMPA树脂对Pb(Ⅱ)、Cu(Ⅱ)和Cd(Ⅱ)吸附量呈先增大后平缓的趋势,pH=5.0为最大值.随着离子溶液的增加对TAMP树脂去除重金属离子有抑制作用;吸附动力学符合准二级模型;Freundlich等温吸附模型可以较好地描述TAMPA对3种重金属的吸附;吸附热力学结果表明其能自发对相关金属离子进行吸附.以EDTA为洗脱剂,重复再生3次后TAMPA仍有可观的吸附性能.结合XPS和量子化学计算模拟结果,提出了TAMPA对Pb(Ⅱ)、Cd(Ⅱ)和Cu(Ⅱ)的吸附作用机制,主要为重金属离子与材料基体中的C=O氧配位螯合作用.A triallyl maleopimarate-acrylic copolymer(TAMPA)was synthesized from triallyl maleopimarate(TAMP)by suspension polymerization.The structure and thermal stability of the resin were characterized by infrared spectroscopy(FTIR),scanning electron microscopy(SEM),N_(2)adsorption-desorption isotherms and thermogravimetric(TG)analysis.The effects of TAMPA dosage,solution pH,temperature,contact time and ionic strength on the adsorption of Pb(Ⅱ),Cu(Ⅱ)and Cd(Ⅱ)in aqueous solutions were investigated in batch experiments to determine its adsorption performance for adsorption of these heavy metal(HM)ions.Adsorption increased with pH in the range from 2.0 to 5.0 and maximum adsorption of each metal was observed at pH 5.0,although it was inhibited with increasing ionic strength of solutions.Adsorption of HMs on TAMPA followed a pseudosecond order rate model and was fitted well by the Freundlich isotherm model.Thermodynamic calculations showed that adsorption of HMs was spontaneous and TAMPA could be regenrated for further adsorption used by eluent with EDTA solution.Based on the results of X-ray photoelectron(XPS)and quantum chemical calculations,a mechanism involving in chelation of oxygen of C=O groups is proposed for adsorption of Pb(Ⅱ),Cu(Ⅱ)and Cd(Ⅱ)by TAMPA.

关 键 词：松香基三烯丙酯交联聚合树脂 合成 重金属 吸附机制 作用模式 

分 类 号：X703[环境科学与工程—环境工程] X131