SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 33 ›› Issue (5): 61-69.DOI: 10.1016/j.cjche.2020.06.031

• Separation Science and Engineering • 上一篇    下一篇

Efficient adsorption to hexavalent chromium by iron oxalate modified D301: Characterization, performance and mechanisms

Dongmei Jia1, Huamin Cai1,2, Yongzheng Duan1, Jiangbao Xia3, Jia Guo2   

  1. 1 School of Chemical Engineering and Safety, Binzhou University, Binzhou 256603, China;
    2 School of Chemical Engineering and Pharmaceutical, Wuhan Institute of Technology, Wuhan 430073, China;
    3 Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta, Binzhou University, Binzhou 256603, China
  • 收稿日期:2020-04-23 修回日期:2020-06-14 出版日期:2021-05-28 发布日期:2021-08-19
  • 通讯作者: Dongmei Jia
  • 基金资助:
    The research has been funded by the National Key Research & Development Program of China (2017YFC0505904), National Natural Science Foundation of China (51808040), Taishan Scholars Program of Shandong Province.

Efficient adsorption to hexavalent chromium by iron oxalate modified D301: Characterization, performance and mechanisms

Dongmei Jia1, Huamin Cai1,2, Yongzheng Duan1, Jiangbao Xia3, Jia Guo2   

  1. 1 School of Chemical Engineering and Safety, Binzhou University, Binzhou 256603, China;
    2 School of Chemical Engineering and Pharmaceutical, Wuhan Institute of Technology, Wuhan 430073, China;
    3 Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta, Binzhou University, Binzhou 256603, China
  • Received:2020-04-23 Revised:2020-06-14 Online:2021-05-28 Published:2021-08-19
  • Contact: Dongmei Jia
  • Supported by:
    The research has been funded by the National Key Research & Development Program of China (2017YFC0505904), National Natural Science Foundation of China (51808040), Taishan Scholars Program of Shandong Province.

摘要: Chromium is a common harmful pollutant with high toxicity and low bearing capacity of soil and water. Excellent salinity resistance, a wide pH range, and high regeneration capacity were essential for qualified adsorbents used in removing hexavalent chromium (Cr(VI)) from polluted water. Herein, iron oxalate modified weak basic resin (IO@D301) for the removal of Cr(VI) was prepared by the impregnation method. The IO@D301 was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Owing to abundant amine, carboxyl groups and iron ions existing on the surface, IO@D301 possesses high adsorption and salinity resistance capacity for Cr(VI). The maximum adsorption capacity of IO301 towards Cr(VI) reached 201.30 mg·g-1 at 293 K and a pH of 5. The adsorption equilibrium was well fitted by the Freundlich model, and the adsorption process was described by the pseudofirst-order kinetics model as spontaneous and exothermic. The mechanism may be identified as electrostatic attraction, coordination, and reduction, which was confirmed by FT-IR and X-ray photoelectron spectroscopy.

关键词: D301, Iron oxalate, Chromium, Adsorption

Abstract: Chromium is a common harmful pollutant with high toxicity and low bearing capacity of soil and water. Excellent salinity resistance, a wide pH range, and high regeneration capacity were essential for qualified adsorbents used in removing hexavalent chromium (Cr(VI)) from polluted water. Herein, iron oxalate modified weak basic resin (IO@D301) for the removal of Cr(VI) was prepared by the impregnation method. The IO@D301 was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Owing to abundant amine, carboxyl groups and iron ions existing on the surface, IO@D301 possesses high adsorption and salinity resistance capacity for Cr(VI). The maximum adsorption capacity of IO301 towards Cr(VI) reached 201.30 mg·g-1 at 293 K and a pH of 5. The adsorption equilibrium was well fitted by the Freundlich model, and the adsorption process was described by the pseudofirst-order kinetics model as spontaneous and exothermic. The mechanism may be identified as electrostatic attraction, coordination, and reduction, which was confirmed by FT-IR and X-ray photoelectron spectroscopy.

Key words: D301, Iron oxalate, Chromium, Adsorption