Efficient adsorption to hexavalent chromium by iron oxalate modified D301:Characterization,performance and mechanisms |
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Authors: | Dongmei Jia Huamin Cai Yongzheng Duan Jiangbao Xia Jia Guo |
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Affiliation: | 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 |
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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. |
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Keywords: | D301 Iron oxalate Chromium Adsorption |
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