SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 33 ›› Issue (5): 319-326.DOI: 10.1016/j.cjche.2020.09.050

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Effect of sulfate on Cu(II) sorption to polymer-supported nano-hydrated ferric oxides: Experimental and modeling studies

Wenxiang Ni1, Luyang Yang1, Xiaolin Zhang2, Hui Qiu1   

  1. 1 Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution;
    Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    2 State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
  • Received:2020-03-23 Revised:2020-09-04 Online:2021-08-19 Published:2021-05-28
  • Contact: Hui Qiu
  • Supported by:
    This work was financially supported by National Natural Science Foundation of China (21607080), Natural Science Foundation of Jiangsu Province (BK20160946). Meanwhile, this research was supported by Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials.

Effect of sulfate on Cu(II) sorption to polymer-supported nano-hydrated ferric oxides: Experimental and modeling studies

Wenxiang Ni1, Luyang Yang1, Xiaolin Zhang2, Hui Qiu1   

  1. 1 Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution;
    Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    2 State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
  • 通讯作者: Hui Qiu
  • 基金资助:
    This work was financially supported by National Natural Science Foundation of China (21607080), Natural Science Foundation of Jiangsu Province (BK20160946). Meanwhile, this research was supported by Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials.

Abstract: Incorporating of hydrous ferric oxide (HFO) inside porous supports with large sizes has become an effective way to decontaminate the water from heavy metals. Ubiquitous anions like sulfate are usually present in high concentrations in water, and might greatly affect adsorption behavior of hybrid HFO. Here, a polymer-based HFO-CPS was fabricated by encapsulating nano-HFO inside a chloromethylated polystyrene polymer (CPS) and the reactivity of HFO-CPS with Cu(II) was evaluated in the presence of sulfate ions. Surface complexation theory was firstly employed to describe the effect of sulfate on Cu(II) adsorption edges of hybrid HFO-CPS, where constant capacitance model (CCM) was adopted. The available weak adsorption site Fe(2)OH of hybrid HFO-CPS was found to decrease from 20% Fe to 5% Fe, which might be caused by the pore plugging effect after HFO encapsulation. With the assumption that a ternary complex was formed, the effect of sulfate on Cu(II) adsorption by HFO-CPS were successfully described by CCM using the optimized Fe(2)OH site under different sulfate concentrations (1 or 10 mmol·L-1) and Cu/Fe ratios (0.0042 or 0.0252). It is confirmed that the formation of FeOHCuSO4 ternary surface complexes played an important role in enhancing Cu(II) adsorption on HFO-CPS in the presence of sulfate.

Key words: Iron oxides, Polymer, Sulfate, Adsorption, Ternary complex

摘要: Incorporating of hydrous ferric oxide (HFO) inside porous supports with large sizes has become an effective way to decontaminate the water from heavy metals. Ubiquitous anions like sulfate are usually present in high concentrations in water, and might greatly affect adsorption behavior of hybrid HFO. Here, a polymer-based HFO-CPS was fabricated by encapsulating nano-HFO inside a chloromethylated polystyrene polymer (CPS) and the reactivity of HFO-CPS with Cu(II) was evaluated in the presence of sulfate ions. Surface complexation theory was firstly employed to describe the effect of sulfate on Cu(II) adsorption edges of hybrid HFO-CPS, where constant capacitance model (CCM) was adopted. The available weak adsorption site Fe(2)OH of hybrid HFO-CPS was found to decrease from 20% Fe to 5% Fe, which might be caused by the pore plugging effect after HFO encapsulation. With the assumption that a ternary complex was formed, the effect of sulfate on Cu(II) adsorption by HFO-CPS were successfully described by CCM using the optimized Fe(2)OH site under different sulfate concentrations (1 or 10 mmol·L-1) and Cu/Fe ratios (0.0042 or 0.0252). It is confirmed that the formation of FeOHCuSO4 ternary surface complexes played an important role in enhancing Cu(II) adsorption on HFO-CPS in the presence of sulfate.

关键词: Iron oxides, Polymer, Sulfate, Adsorption, Ternary complex