含邻苯二酚基团微凝胶的合成及其硝酸根离子响应特性  

Synthesis and Nitrate-responsiveness of Catechol-containing Microgels

作　　者：邵雯 李靖宇 沈静 谢建达 吴伟泰[1] Wen Shao;Jing-yu Li;Jing Shen;Jian-da Xie;Wei-taiWu(State Key Laboratory for Physical Chemistry of Solid Surfaces,Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005;College of Chemistry and Chemical Engineering,Yunnan Normal University,Kunming 650500;School of Materials Science and Engineering,Xiamen University of Technology,Xiamen 361024)

机构地区：[1]厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门361005 [2]云南师范大学化学化工学院,昆明650500 [3]厦门理工学院材料科学与工程学院,厦门361024

出　　处：《高分子学报》2023年第1期121-129,共9页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21774105,20923004);福建省中青年教师教育科研(项目号JAT200483)资助项目.

摘　　要：刺激响应微凝胶有望用于捕获水体中硝酸根离子,并允许材料自身的再生循环使用,但如何实现高效捕获水体中硝酸根离子颇具挑战性.本工作合成了单体2,3-二羟基-N-(2-甲基烯丙基)苯甲酰胺,并将其与苯乙烯、4-氯甲基苯乙烯、二乙烯基苯共聚,制得含邻苯二酚基团微凝胶.随着硝酸根离子浓度(以氮计)在0~40.0 mg/L范围内逐渐增大,浊度法表征表明在常温22℃下微凝胶水溶液消光度呈现持续增大趋势,而动态光散射法表征表明微凝胶粒径减小,即发生收缩.色谱法表征表明,微凝胶对硝酸根离子具有较好吸附性能,最大吸附容量达54.2 mg/g,即使对低浓度硝酸根离子(≤10 mg/L)也可在10 min内达到吸附平衡,有望用于废水处理.Nitrate-responsive polymer microgels are potentially used as renewable adsorbents for nitrate removal.However,how to identify nitrate in water with high efficiency remains a challenge.In this work,we synthesized a monomer,2,3-dihydroxy-N-(2-methylallyl)benzamide that contained catechol groups,which was then used for the synthesis of catechol-containing microgels via copolymerization with styrene,1-(chloromethyl)-4-vinylbenzene and 1,4-divinylbenzene.With an increase in nitrate concentration over an environmentally relevant range of 0-40.0 mg/L(i.e.,0-2.9 mmol/L),turbidity tests show that the extinction of the microgel dispersion increases,and dynamic light scattering tests reveal that the hydrodynamic diameter of the microgels become smaller,indicating deswelling of the microgels,whereas the microgels would swell slightly upon adding other anions(with sulfate,chloridion,and bromide ion as models).It is possible that the deswelling behaviour of the microgels in response to nitrate is related to the presence of the catechol groups,which might bind nitrate through indirect interactions that make the microgels display salting out effect.This is further demonstrated by chromatographic tests.It is shown that the microgels can exhibit good adsorption performance for nitrate capture,with the maximum adsorption capacity being as high as 54.2 mg/g,and reach equilibrium rapidly(within 10 min)even for the low concentrations of nitrate(≤10 mg/L),making them potential use for wastewater treatment(with tailwater from a local aquaculture as the model).

关 键 词：高分子微凝胶 刺激响应 硝酸根离子 废水处理 

分 类 号：X703[环境科学与工程—环境工程] TQ427.26[化学工程]