文献类型：期刊文献

中文题名：在多孔有机聚合物中构筑广谱性重金属离子吸附活性位

英文题名：Construction of Active Sites in Porous Organic Polymers for Various Heavy Metal Ions Capture

作者：赵开庆[1];吴若雨[1];罗翌峰[1];石春红[2];胡军[1]

机构：[1]华东理工大学化学与分子工程学院,费林加诺贝尔奖科学家联合研究中心先进材料重点实验室,上海200237;[2]上海市松江食品药品检验所,上海200003

年份：2021

卷号：42

期号：3

起止页码：834

中文期刊名：高等学校化学学报

外文期刊名：Chemical Journal of Chinese Universities

收录：CSTPCD;;EI(收录号：20211410160108);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000627118700021)】；北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：Supported by the National Natural Science Foundation of China (Nos.21676080, 21878076).

语种：中文

中文关键词：重金属离子;吸附;多孔有机聚合物;广谱性;吸附性能

外文关键词：Heavy metal ion;Adsorption;Porous organic polymer;Broad spectrum;Adsorption performance

摘要：以三维刚性结构的三蝶烯为单体,通过简单的Friedel-Crafts烷基化反应制备得到高比表面积的三蝶烯基多孔有机聚合物(TPOP),在TPOP中接枝乙二胺和氯乙酸钠,构建了广谱重金属离子吸附剂(TPOPCH_(2)EDTA).获得的TPOP-CH_(2)EDTA具有微孔/介孔结构,其微孔尺寸为1.6 nm,BET比表面积为634 m^(2)/g,利于重金属离子传递和配位作用的强化.TPOP-CH_(2)EDTA对重金属离子具有吸附广谱性,其对Ag(Ⅰ),Cu(Ⅱ),Ni(Ⅱ),Zn(Ⅱ),Co(Ⅱ),Sn(Ⅳ),Pb(Ⅱ),Cd(Ⅱ),Fe(Ⅲ)和Cr(Ⅲ)等10种重金属离子的去除率均高于98%.以Pb(Ⅱ)为典型的重金属污染物,通过Langmuir模型计算得到Pb(Ⅱ)的最大吸附容量高达184.5 mg/g;具有拟二级吸附动力学特征,吸附速率快,动力学常数k2为0.0173 g·mg^(?1)·min^(?1);经过5次循环使用后,Pb(Ⅱ)的去除效率仍高达95.8%.TPOPCH_(2)EDTA对混合溶液中Pb(Ⅱ)和Cu(Ⅱ)的去除率均高于99%,且对含有大量无机盐[如Ca(Ⅱ),Mg(Ⅱ),K(Ⅰ)和Na(Ⅰ)离子]和有机化合物的复杂真实水体系,Pb(Ⅱ)和Cu(Ⅱ)的去除效率仍高于90%.因此,通过调控多孔有机聚合物微观结构(如比表面积、孔径和吸附位点密度)而构筑的广谱性重金属吸附材料,为协同去除复杂水系统中混合重金属离子提供了方案.
Heavy metal pollution is directly related to human health and life safety,and the development of broad-spectrum and high-efficiency heavy metal adsorbents is expected to solve the problem of coexistence of multiple heavy metal pollutants in industrial wastewater.A triptycene-based porous organic polymer(TPOP)with high specific surface area was produced by crosslinking three-dimensional rigid triptycene monomer through the simple Friedel-Crafts alkylation reaction.Then,a broad-spectrum heavy metal ions adsorption ac?tive site(TPOP-CH_(2)EDTA)was constructed in TPOP by grafting of ethylenediamine and sodium chloroacetate.The obtained TPOP-CH_(2)EDTA showed a micro/mesoporous structure,with the main micropore size of 1.6 nm and the BET surface area of 634 m^(2)/g,which facilitates the transfer and coordination of heavy metal ions.TPOP-CH_(2)EDTA has a broad-spectrum adsorption for heavy metal ions,like Ag(Ⅰ),Cu(Ⅱ),Ni(Ⅱ),Zn(Ⅱ),Co(Ⅱ),Sn(Ⅳ),Pb(Ⅱ),Cd(Ⅱ),Fe(Ⅲ),Cr(Ⅲ)are investigated,respectively,and the removal efficien?cy are all higher than 98%.Taking Pb(Ⅱ)as a typical heavy metal pollutant,the maximum adsorption capaci?ty of Pb(Ⅱ)is calculated up to 184.5 mg/g by the Langmuir model.The kinetic study shows that it is a Pseudosecond-order adsorption,fast adsorption rate,and the kinetic constant k2 of 0.0173 g·mg^(?1)·min^(?1).After 5 recy?cling use,the removal efficiency of Pb(Ⅱ)is still as high as 95.8%.More significantly,the removal efficiency of Pb(Ⅱ)and Cu(Ⅱ)in their mixture solution is either higher than 99%.For the complex real water containing large amounts of inorganic salts,like Ca(Ⅱ),Mg(Ⅱ),K(Ⅰ),Na(Ⅰ)ions,and organic compounds,the removal efficiency of Pb(Ⅱ)and Cu(Ⅱ)still maintains higher than 90%.Therefore,a broad-spectrum heavy metal ion adsorption active site is constructed by controlling the microstructure of porous organic polymers(such as specific surface area,pore size and adsorption site density),which provides a scheme for the coordinated removal of mixed heavy metal ions in complex water systems.