SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 36 ›› Issue (8): 19-28.DOI: 10.1016/j.cjche.2020.07.031

• Separation Science and Engineering • Previous Articles     Next Articles

Eco friendly adsorbents for removal of phenol from aqueous solution employing nanoparticle zero-valent iron synthesized from modified green tea bio-waste and supported on silty clay

Shaimaa T. Kadhum1, Ghayda Yassen Alkindi1, Talib M. Albayati2   

  1. 1 Department of Civil Engineering, University of Technology, 52 Alsinaa St., Baghdad, PO Box 35010, Iraq;
    2 Department of Chemical Engineering, University of Technology, 52 Alsinaa St., Baghdad 35010, Iraq
  • Received:2020-04-27 Revised:2020-07-09 Online:2021-09-30 Published:2021-08-28
  • Contact: Talib M. Albayati
  • Supported by:
    The authors gratefully acknowledge the scientific support and help from the Civil Engineering Department and Chemical Engineering Department, University of Technology, Baghdad, Iraq.

Eco friendly adsorbents for removal of phenol from aqueous solution employing nanoparticle zero-valent iron synthesized from modified green tea bio-waste and supported on silty clay

Shaimaa T. Kadhum1, Ghayda Yassen Alkindi1, Talib M. Albayati2   

  1. 1 Department of Civil Engineering, University of Technology, 52 Alsinaa St., Baghdad, PO Box 35010, Iraq;
    2 Department of Chemical Engineering, University of Technology, 52 Alsinaa St., Baghdad 35010, Iraq
  • 通讯作者: Talib M. Albayati
  • 基金资助:
    The authors gratefully acknowledge the scientific support and help from the Civil Engineering Department and Chemical Engineering Department, University of Technology, Baghdad, Iraq.

Abstract: The present research investigated a novel route for the synthesis of nanoparticle zero-valent iron (NZVI) utilizing an aqueous extract of green tea waste as a reductant with ferric chloride. Also, the supported nanoparticle zero-valent iron was synthesized using natural silty clay as a support material (SC-NZVI). The NZVI and SC-NZVI were characterized by infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and zeta potential (ζ). The interpretation of the results demonstrated that the polyphenol and other antioxidants in green tea waste can be used as reduction and capping agents in NZVI synthesis, with silty clay an adequate support. Additionally, the experiments were carried out to explore phenol adsorption by NZVI and SC-NZVI. To determine the optimum conditions, the impact of diverse experimental factors (i.e., initial pH, adsorbent dose, temperature, and concentration of phenol) was studied. Langmuir, Freundlich, and Tempkin isotherms were used as representatives of adsorption equilibrium. The obtained results indicated that the adsorption processes for both NZVI and SC-NZVI well fitted by the Freundlich isotherm model. The appropriateness of pseudo_first_order and pseudo_second_order kinetics was investigated. The experimental kinetics data were good explained by the second-order model. The thermodynamic parameters (ΔH0, ΔS0, and ΔG0) for NZVI and SC-NZVI were determined. The maximum removal rates of phenol at optimum conditions, when adsorbed onto NZVI and SC-NZVI, were found to be 94.8% and 90.1%, respectively.

Key words: Wastewater treatment, Environment, Nano zero-valent iron, Silty clay, Phenol, Adsorption

摘要: The present research investigated a novel route for the synthesis of nanoparticle zero-valent iron (NZVI) utilizing an aqueous extract of green tea waste as a reductant with ferric chloride. Also, the supported nanoparticle zero-valent iron was synthesized using natural silty clay as a support material (SC-NZVI). The NZVI and SC-NZVI were characterized by infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and zeta potential (ζ). The interpretation of the results demonstrated that the polyphenol and other antioxidants in green tea waste can be used as reduction and capping agents in NZVI synthesis, with silty clay an adequate support. Additionally, the experiments were carried out to explore phenol adsorption by NZVI and SC-NZVI. To determine the optimum conditions, the impact of diverse experimental factors (i.e., initial pH, adsorbent dose, temperature, and concentration of phenol) was studied. Langmuir, Freundlich, and Tempkin isotherms were used as representatives of adsorption equilibrium. The obtained results indicated that the adsorption processes for both NZVI and SC-NZVI well fitted by the Freundlich isotherm model. The appropriateness of pseudo_first_order and pseudo_second_order kinetics was investigated. The experimental kinetics data were good explained by the second-order model. The thermodynamic parameters (ΔH0, ΔS0, and ΔG0) for NZVI and SC-NZVI were determined. The maximum removal rates of phenol at optimum conditions, when adsorbed onto NZVI and SC-NZVI, were found to be 94.8% and 90.1%, respectively.

关键词: Wastewater treatment, Environment, Nano zero-valent iron, Silty clay, Phenol, Adsorption