研究报告

  • 崔立莉,焦莉,谢寅盼,叶正芳.硫脲修饰超高交联聚苯乙烯树脂吸附Cr(Ⅵ)[J].环境科学学报,2022,42(11):25-33

  • 硫脲修饰超高交联聚苯乙烯树脂吸附Cr(Ⅵ)
  • Adsorption of Cr(Ⅵ) on thiourea modified ultra-high crosslinked polystyrene resin
  • 基金项目:北京市科技计划项目(No.Z151100000915065);河北省重点研发计划项目(No.17273614);河北建筑工程学院项目(No.B201301)
  • 作者
  • 单位
  • 崔立莉
  • 河北建筑工程学院市政与环境工程系,河北省水质工程与水资源综合利用重点实验室,张家口 075000;北京大学环境科学与工程学院,教育部水沙科学与环境工程重点实验室,北京 100871
  • 焦莉
  • 河北建筑工程学院市政与环境工程系,河北省水质工程与水资源综合利用重点实验室,张家口 075000;北京大学环境科学与工程学院,教育部水沙科学与环境工程重点实验室,北京 100871
  • 谢寅盼
  • 河北建筑工程学院市政与环境工程系,河北省水质工程与水资源综合利用重点实验室,张家口 075000;北京大学环境科学与工程学院,教育部水沙科学与环境工程重点实验室,北京 100871
  • 叶正芳
  • 北京大学环境科学与工程学院,教育部水沙科学与环境工程重点实验室,北京 100871
  • 摘要:以氯甲基聚苯乙烯树脂(CMPS)为前体,经后交联反应合成超高交联树脂(J-2),再经硫脲胺基改性得到硫脲修饰超高交联聚苯乙烯树脂(TU-PS).通过BET、FTIR等对树脂结构进行表征,并考察了pH、吸附温度、接触时间等因素对TU-PS改性树脂吸附Cr(Ⅵ)性能的影响.结果表明,改性树脂(TU-PS)对Cr(Ⅵ)吸附的最佳条件为:Cr(Ⅵ)初始浓度为500 mg·L-1、初始pH值为2、树脂用量为2.5 g·L-1、吸附温度为45 ℃、吸附时间为6 h.在此最佳条件下,TU-PS树脂对Cr(Ⅵ)的最大吸附量为140.00 mg·g-1,去除率为70.18%.吸附过程符合Langmuir等温吸附模型和 准二级动力学模型,吸附过程以单分子层化学吸附为主.TU-PS树脂对Cr(Ⅵ)的吸附是静电吸附和化学吸附共同作用的结果.
  • Abstract:The chloromethylated polystyrene resin(CMPS)was used as a precursor to synthesize ultra-high cross-linked resin (J-2) by post-cross-linking reaction, and then modified by thiourea amino to produce thiourea amino-modified ultra-high cross-linked polystyrene resin (TU-PS). The structure of the modified resin was characterized by the BET and FTIR, and the adsorption performance of the TU-PS modified resin on Cr(VI) was investigated under pH, temperature, contact time and other factors. The results demonstrated that: ①the optimal adsorption condition of Cr(VI) by the TU-Ps was as followed: Initial concentration of Cr(VI) was 500 mg L-1, initial pH value was 2, modified resin dosage was 2.5 g·L-1, adsorption temperature was 45 ℃, adsorption time was 6 h. ②Under the optimal condition, the maximum equilibrium adsorption capacity of Cr(VI) on the TU-PS was 140.00 mg·g-1, and the removal rate is 70.18%. ③The adsorption process was in accordance with the Langmuir isothermal adsorption model and quasi-secondary kinetic model, and the adsorption process was dominated by single-molecule layer chemisorption. ④The adsorption of Cr(VI) by the TU-PS was resulted by the electrostatic adsorption and chemisorption.

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