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杨新蔚1,2 单国荣1,2 曹志海3 吕挺4 潘鹏举1,2

(1.化学工程联合国家重点实验室浙江大学化学工程与生物工程学院, 浙江杭州 310027)
(2.浙江大学衢州研究院, 浙江衢州 324000)
(3.浙江理工大学先进纺织材料与制备技术教育部重点实验室, 浙江杭州 310018)
(4.杭州电子科技大学材料与环境工程学院, 浙江杭州 310018)

【摘要】用冷冻聚合法和非冷冻聚合法制备了氧化石墨烯/聚(N-异丙基丙烯酰胺-顺丁烯二酸)(GO/P(NIPAM-MA))水凝胶,比较制备方法对GO/P(NIPAM-MA)水凝胶La3+吸附能力的影响,发现通过冷冻聚合法合成的水凝胶,具有更加优异的溶胀-退溶胀性能和吸附性能。NIPAM与MA摩尔比为10∶1的冷冻聚合法水凝胶,在370 mg/L的LaCl3溶液中平衡吸附量为(29.87±0.073)mg/g,而相同条件下的非冷冻聚合法水凝胶平衡吸附量仅为(20.29±0.395)mg/g。冷冻聚合法水凝胶的Freundlich等温线拟合参数n值随着MA含量的增加呈线性增加,而非冷冻聚合法水凝胶增加幅度小于冷冻聚合法。经过5次吸附-解吸循环,冷冻聚合法水凝胶的形状和体积没有明显变化且吸附能力没有明显下降,而非冷冻聚合法水凝胶经过3次吸附-解吸循环就出现破碎,无法再使用。冷冻聚合法合成的GO/P(NIPAM-MA)水凝胶具有La3+平衡吸附量大、可重复使用等优点。

【关键词】 吸附;脱附;水凝胶;冷冻聚合;La3+;


Effect of preparation methods on La3+ adsorption properties of GO/P(NIPAM-MA) hydrogels

YANG Xinwei1,2 SHAN Guorong1,2 CAO Zhihai3 LYU Ting4 PAN Pengju1,2

(1.State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, China 310027)
(2.Institute of Zhejiang University-Quzhou, Quzhou, Zhejiang, China 324000)
(3.Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China 310018)
(4.College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang, China 310018)

【Abstract】Graphene oxide/poly(N-isopropylacrylamide-maleic acid)[GO/P(NIPAM-MA)] hydrogel was prepared by freeze polymerization and non-freeze polymerization, and the preparation methods were compared in terms of the La3+ adsorption capacity of GO/P(NIPAM-MA) hydrogel. It is found that the hydrogel synthesized by the freeze polymerization method has an excellent swelling-shrinking and adsorption properties. With an equivalent molar ratio of 10:1 for NIPAM:MA and 370 mg/L of LaCl3 solution, the equilibrium adsorption capacity of the hydrogel synthesized by the freeze polymerization method is (29.87 ± 0.073) mg/g, while that of the hydrogel synthesized by the non-freeze polymerization method is only (20.29 ± 0.395) mg/g. The fitting parameter, n, of the Freundlich isotherm increases linearly with the increase in MA content for the hydrogel synthesized by the freeze polymerization method, and the increasing degree is larger than that of the hydrogel synthesized by the non-freeze polymerization method. After five repeated adsorption–desorption cycles, it is found that there is no significant deformation and the adsorption capacity is not obviously decreased for the hydrogel synthesized by the freeze polymerization method, while the hydrogel synthesized by the non-freeze polymerization method is broken after three repeated adsorption–desorption cycles. The GO/P(NIPAM-MA) hydrogel synthesized by the freeze polymerization method has the advantages of large equilibrium adsorption capacity for La3+ and reusability.

【Keywords】 adsorption; desorption; hydrogel; freeze polymerization; La3+;


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This Article


CN: 11-1946/TQ

Vol 70, No. 10, Pages 4072-4079+3612

October 2019


Article Outline


  • Introduction
  • 1 Experimental
  • 2 Results and discussion
  • 3 Conclusions
  • Symbol description
  • References