高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (10): 2289-2297.doi: 10.7503/cjcu20180064

• 高分子化学 • 上一篇    下一篇

全互穿网络温敏海藻酸锆凝胶球的磷吸附性能

骆华勇, 荣宏伟(), 曾学阳, 王然登, 储昭瑞   

  1. 广州大学土木工程学院, 广州 510006
  • 收稿日期:2018-01-19 出版日期:2018-09-29 发布日期:2018-09-29
  • 作者简介:

    联系人简介: 荣宏伟, 男, 博士, 教授, 主要从事水处理研究. E-mail: hwrong@gzhu.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 51608133, 51778155)、 广州大学新进优秀青年博士培养计划项目(批准号: YB201718)、 广州大学科技创新培育基金(批准号: LHY2-2608)和广州大学大学生创新训练项目(批准号: 201611078008, CX2017117)资助.

Performance of Phosphorus Sorption on Thermosensitive Zirconium Alginate Hydrogel Beads with Full-interpenetrating Network

LUO Huayong, RONG Hongwei*(), ZENG Xueyang, WANG Randeng, CHU Zhaorui   

  1. School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
  • Received:2018-01-19 Online:2018-09-29 Published:2018-09-29
  • Contact: RONG Hongwei E-mail:hwrong@gzhu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.51608133, 51778155), the Guangzhou University’s Training Program for Excellent New-recruited Doctors, China(No.YB201718), the Foundation for Fostering the Scientific and Technical Innovation of Guangzhou University, China(No.LHY2-2608) and the Undergraduate Innovation Program of Guangzhou University, China(Nos.201611078008, CX2017117).

摘要:

制备了具有温敏性的全互穿网络聚(N-异丙基丙烯酰胺)/海藻酸锆凝胶球(PNIPAM/Alg-Zr), 探究了其吸附回收水中磷的性能. 结果发现, 吸附性能受到pH、 温度和共存离子因素的影响. 酸性条件(pH=2)下可获得最大吸附量(30.42 mg/L). 低温有利于获得较高吸附量. S$O_{4}^{2-}$对吸附磷的过程有一定的干扰, 但增加S$O_{4}^{2-}$ 浓度对吸附性能的影响不大. 吸附动力学更符合准二级动力学模型, 为表面扩散和内部颗粒扩散所控制. Freundlich模型能更好地拟合等温吸附数据. 吸附磷后的PNIPAM/Alg-Zr在较高温度刺激下可获得更快的脱附速率, 并且5次循环再生后保持稳定的吸附性能. 通过零点电荷pH(pHpzc)和X射线光电子能谱分析, 推测其吸附机理为静电吸附和配位交换. PNIPAM/Alg-Zr呈现良好的柱吸附特点, 可用Thomas模型进行模拟.

关键词: 海藻酸锆凝胶球, 全互穿网络, 温敏性, 磷, 柱吸附

Abstract:

Thermosensitive poly(N-isopropylacrylamide)/zirconium alginate hydrogel beads with full-interpenetrating network(PNIPAM/Alg-Zr) were prepared and explored as a sorbent for phosphorus(P) recovery from aqueous solutions. The sorption of P onto PNIPAM/Alg-Zr was affected by pH, temperature and co-existing anions. A maximum uptake capacity of 30.42 mg/L was observed at pH=2. A low temperature was favourable for the sorption process. The presence of S$O_{4}^{2-}$ had a certain interference on P sorption while a slight effect of S$O_{4}^{2-}$ under higher ionic strength was observed. The sorption kinetics followed the pseudo-second-order model and was regulated by surface and intraparticle diffusion. The isotherm data were well fitted to the Freundlich model. The P-loaded PNIPAM/Alg-Zr achieved a faster desorption rate under a high temperature stimulus, and the uptake capacity of P remained stable after five times regeneration. The inferred sorption mechanisms were electrostatic interaction and ligand exchange verified by the analysis of pH value at zero point charge(pHpzc) and XPS. PNIPAM/Alg-Zr exhibited good column-sorption characteristic, and the Thomas model could fit well the experimental data.

Key words: Zirconium alginate hydrogel bead, Full-interpenetrating network, Thermosensitive, Phosphorus, Column sorption

中图分类号: