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Removal of Ni(II) from aqueous solutions using activated carbon with manganese formate hydrate in-situ modification

Yu, Jiamin, Zhang, Jian, Song, Shiying, Liu, Hai, Guo, Zizhang, Zhang, Chenglu
Colloids and surfaces 2019 v.560 pp. 84-91
Fourier transform infrared spectroscopy, Phragmites australis, X-ray diffraction, X-ray photoelectron spectroscopy, activated carbon, adsorbents, adsorption, aqueous solutions, colloids, desorption, formates, manganese, models, moieties, nickel, phosphoric acid, porous media, sorption isotherms, water treatment
Activated carbon (AC) derived from Phragmites Australis (PA) with phosphoric acid activation as a low-cost adsorbent is extensively used in water treatment. In this study, a novel manganese formate hydrate (MFH) in-situ modified activated carbon (AC-MFH) has been proposed and investigated. The physical and chemical characteristics of adsorbents were characterized by N2 adsorption/desorption, Fourier transform infrared (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that AC-MFH had more microporous structures and surface oxygen-containing functional groups than AC. The Ni(II) adsorption behaviors of adsorbents were investigated by batch experiments, the results suggested that AC-MFH showed 20% higher Ni(II) adsorption capacity than that of AC and the associated adsorption isotherms and kinetics well fitted to the Langmuir model and pseudo-second-order model, respectively. The Ni(II) adsorption mechanisms of AC-MFH were investigated by FTIR and XPS analysis. These results indicated that the adsorption of Ni(II) mainly depended on the surface chemistry between the Ni(II) and surface oxygen-containing functional groups.