Synthesis and Nitrate-responsiveness of Catechol-containing Microgels

Wen Shao; Jing-yu Li; Jing Shen; Jian-da Xie; Wei-tai Wu

doi:10.11777/j.issn1000-3304.2022.22202

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Synthesis and Nitrate-responsiveness of Catechol-containing Microgels

Research Article | 更新时间：2023-05-22

- Synthesis and Nitrate-responsiveness of Catechol-containing Microgels
- ACTA POLYMERICA SINICA Vol. 54, Issue 1, Pages: 121-129(2023)
- 作者机构：
  
  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
- 作者简介：
  
  Wei-tai Wu, E-mail: wuwtxmu@xmu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2022.22202
  CLC：
- Published：20 January 2023，
  
  Published Online：17 September 2022，
  
  Received：11 May 2022，
  
  Accepted：27 June 2022
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邵雯,李靖宇,沈静等.含邻苯二酚基团微凝胶的合成及其硝酸根离子响应特性[J].高分子学报,2023,54(01):121-129.

Shao Wen,Li Jing-yu,Shen Jing,et al.Synthesis and Nitrate-responsiveness of Catechol-containing Microgels[J].ACTA POLYMERICA SINICA,2023,54(01):121-129.
邵雯,李靖宇,沈静等.含邻苯二酚基团微凝胶的合成及其硝酸根离子响应特性[J].高分子学报,2023,54(01):121-129. DOI： 10.11777/j.issn1000-3304.2022.22202.

Shao Wen,Li Jing-yu,Shen Jing,et al.Synthesis and Nitrate-responsiveness of Catechol-containing Microgels[J].ACTA POLYMERICA SINICA,2023,54(01):121-129. DOI： 10.11777/j.issn1000-3304.2022.22202.

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-

-(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.

Abstract

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

3-dihydroxy-

-‍(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

Keywords

Polymer microgelsStimuli-responsiveNitrateWastewater treatment

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