Efficient adsorption to hexavalent chromium by iron oxalate modified D301: Characterization, performance and mechanisms
| Autor: | Dongmei Jia, Jiangbao Xia, Huamin Cai, Yongzheng Duan, Jia Guo |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Chemistry Scanning electron microscope General Chemical Engineering chemistry.chemical_element 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Biochemistry chemistry.chemical_compound Chromium Adsorption 020401 chemical engineering X-ray photoelectron spectroscopy Iron oxalate Amine gas treating 0204 chemical engineering Fourier transform infrared spectroscopy Hexavalent chromium 0210 nano-technology Nuclear chemistry |
| Zdroj: | Chinese Journal of Chemical Engineering. 33:61-69 |
| ISSN: | 1004-9541 |
| DOI: | 10.1016/j.cjche.2020.06.031 |
| Popis: | 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 pseudo-first-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. |
| Databáze: | OpenAIRE |
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