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Ionic-Strength Responsive Zwitterionic Copolymer Hydrogels with Tunable Swelling and Adsorption Behaviors
Tao Xiang1,2, Ting Lu3, Wei-Feng Zhao4
1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering , Southwest Jiaotong University , Chengdu 610031 , China.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 16, 2018
Summary
Zwitterionic copolymer hydrogels exhibit tunable swelling with ionic strength. These advanced materials demonstrate significant methylene blue adsorption, showing promise for wastewater treatment applications.
Area of Science:
- Polymer Science
- Materials Science
- Environmental Science
Background:
- Zwitterionic polymers offer unique properties for various applications.
- Hydrogels are versatile polymeric networks with high water content.
- Developing efficient adsorbents for wastewater treatment is crucial.
Purpose of the Study:
- To synthesize and characterize zwitterionic copolymer hydrogels.
- To investigate the swelling and adsorption behaviors of these hydrogels.
- To evaluate their potential for methylene blue removal from water.
Main Methods:
- Free radical copolymerization of sulfobetaine methacrylate (SBMA) and other monomers.
- Analysis of hydrogel swelling ratio under varying ionic strengths and temperatures.
- Adsorption studies using methylene blue as a model pollutant.
Main Results:
- Polysulfobetaine methacrylate (PSBMA) hydrogels showed increased swelling with ionic strength, indicating endothermic swelling.
- PSBMA-sodium p-styrenesulfonate (PNaSS) hydrogels collapsed at higher ionic strengths due to weakened anionic group repulsion.
- PSBMA-NaSS hydrogels demonstrated high methylene blue adsorption capacity (760 mg/g).
Conclusions:
- Zwitterionic copolymer hydrogels possess tunable swelling characteristics influenced by ionic strength.
- The observed swelling behavior is endothermic and can be modulated by ionic interactions.
- These hydrogels show significant potential as effective adsorbents in wastewater treatment, particularly for dye removal.
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