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Highly selective separation of dyes using compressed CO2 and spherical polyelectrolyte brushes

机译：使用压缩的CO2和球面聚电解质刷的高度选择性分离染料

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摘要

Spherical polyelectrolyte brushes (SPBs), consisting of a poly(styrene) core and poly(acrylic acid) shell densely grafted from the core surface, were synthesized by photoemulsion polymerization. A novel method for highly selective separation of methylene blue (MB) and other dyes is proposed herein, which employs spherical polyelectrolyte brushes as the adsorbent and compressed CO2 as the antisolvent; neither polymer brush nor CO2 on their own can separate the dyes. The SPBs and adsorbed dyes can be precipitated simultaneously from organic solutions by the easy control of CO2 pressure. The effects of several parameters such as CO2 pressure, initial dye concentration and temperature on the removal of MB by PS-PAA have been determined. MB can be selectively adsorbed by PS-PAA from the mixed dye solution with high efficiency, indicating that the binding of MB onto PS-PAA is probably dominated by electrostatic interactions. Due to the Donnan effect of the polymer brush, the adsorbed dyes can be easily eluted by NaCl aqueous solution through ion exchange to obtain the regeneration of the polymer brush, and the recovered PS-PAA retains high adsorption capacity even being regenerated five times. This provides a simple and effective way for the separation of ionic materials, which could be applied in environmental engineering.
机译：由光乳液聚合合成由聚（苯乙烯）核和聚（丙烯酸）壳体的聚（苯乙烯）核和聚（丙烯酸）壳体组成的球形聚电解质刷（SPB）由光乳剂聚合合成。本文提出了一种用于高选择性分离亚甲基蓝（MB）和其他染料的新方法，其采用球面聚电解质刷作为吸附剂和压缩二氧化碳作为防溶剂;它们都不是它们自己的聚合物刷和二氧化碳可以分离染料。通过易于控制CO 2压力，SPB和吸附的染料可以从有机溶液中同时沉淀。已经确定了诸如CO 2压力，初始染料浓度和温度的几种参数对PS-PAA除去MB的效果。 MB可以通过PS-PAA从混合染料溶液中选择性地吸附，表明MB在PS-PAA上的结合可能由静电相互作用主导。由于聚合物刷的乳蛋白效果，通过离子交换的NaCl水溶液容易洗脱吸附的染料，以获得聚合物刷的再生，并且甚至再生5次，回收的PS-PAA保持高吸附能力。这为离子材料分离提供了一种简单且有效的方法，其可用于环境工程中。

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  • 来源
    《RSC Advances》 |2016年第48期|共8页
  • 作者

    Zhang Rui; Yu Zhenchuan; Cang Yu; Hou Xiaoyan; Shen Zheqi; Deng Jie; Zhou Zhiming; Guo Xuhong; Wang Junwei; Zhu Xuedong;

  • 作者单位

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

    Collaborat Innovat Ctr Petrochem New Mat Anqing 246011 Anhui Peoples R China;

    E China Univ Sci &

    Technol State Key Lab Chem Engn 130 Meilong Rd Shanghai 200237 Peoples R China;

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