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Synthesis of PANI/AlOOH composite for Cr(VI) adsorption and reduction from aqueous solutions
Author(s) -
Chen Zhongshan,
Wei Benben,
Yang Shanye,
Li Qian,
Liu Lu,
Yu Shujun,
Wen Tao,
Hu Baowei,
Chen Jianrong,
Wang Xiangke
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803898
Subject(s) - adsorption , aqueous solution , polyaniline , x ray photoelectron spectroscopy , chemisorption , fourier transform infrared spectroscopy , chromium , chemistry , langmuir adsorption model , inorganic chemistry , ethylenediamine , infrared spectroscopy , nuclear chemistry , materials science , chemical engineering , organic chemistry , polymer , engineering , polymerization
Abstract In this study, polyaniline rafted to the surface of AlOOH (PANI/AlOOH) composites were successfully synthesized and applied for chromium (Cr(VI)) adsorption from aqueous solutions. Cr(VI) adsorption isotherms were described by Langmuir model well and the maximum adsorption capacity was 66.77 mg/g at pH=5 and T=298 K. Cr(VI) adsorption was attributed to chemisorption and outer‐sphere surface complexation. The interaction mechanism was further investigated by Fourier transform infrared spectroscopy, transmission electron microscopy‐energy dispersive spectroscopy and X‐ray photoelectron spectroscopy techniques, and the results suggested the partially reduction of Cr(VI) to Cr(III). Cr(VI) removal was mainly related with the electrostatic attraction and chelation of different Cr(VI)/Cr(III) species with protonated nitrogen‐containing functional groups (‐NH+, ‐NH‐) on PANI/AlOOH.