pH-responsive poly(gellan gum-co-acrylamide-co-acrylic acid) hydrogel: Synthesis, and its application for organic dye removal
文献类型： 外文期刊
作者： Zheng, Meixia 1 ; Cai, Kunqi 2 ; Chen, Meichun 1 ; Zhu, Yujing 1 ; Zhang, Longtao 2 ; Zheng, Baodong 2 ;
作者机构： 1.Fujian Acad Agr Sci, Agr Bioresources Res Inst, Fuzhou 350003, Fujian, Peoples R China
2.Fujian Agr & Forestry Univ, Coll Food Sci, Fuzhou 350002, Fujian, Peoples R China
3.Fujian Agr & Forestry Univ, China Ireland Int Cooperat Lab Foods Mat Sci & St, Fuzhou 350002, Fujian, Peoples R China
4.Fujian Agr & Forestry Univ, Fujian Prov Key Lab Qual Sci & Proc Technol Speci, Fuzhou 350002, Fujian, Peoples R China
关键词： Hydrogel; Gellan gum; Modify; Organic dye; Adsorption
期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：6.953； 五年影响因子：6.737 ）
ISSN： 0141-8130
年卷期： 2020 年 153 卷
页码：
收录情况： SCI
摘要： A poly(gellan gum-co-acrylamide-co-acrylic acid) (GGDA) hydrogel was synthesized by modifying gellan gum (GG) with partly neutralized acrylic acid (AAc) and acrylamide (AAm) under the crosslinking agent trimethyloipropane triglycidyl ether. With the introduction of carboxyl and amino groups by the AAc and AAm, the GGDA showed better regularity than GG, leading to a more porous structure and higher thermal stability. Methylene blue (MB) was used as a model organic dye to evaluate the adsorption capacity of the GGDA. The GGDA exhibited excellent MB adsorption abilities and pH sensitivity. The pseudo-second-order and Freundlich isotherm models produced the best fits for the adsorption kinetics and adsorption equilibrium, respectively. The Gibbs free energy, enthalpy, and entropy of adsorption indicated that the adsorption was a spontaneous, exo-thermic, and entropy-decreasing process. The maximum equilibrium adsorption capacity of MB was 423.46 +/- 13.60 mg/g. This pH-sensitive hydrogel is a potential alternative absorbent for organic dye removal in aqueous solutions. (C) 2020 Elsevier B.V. All rights reserved.
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