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Removal of low concentration Cr(VI) from aqueous solution by modified wheat straw
Author(s) -
Sun XiaoFeng,
Jing Zhanxin,
Wang Haihong,
Li Yajing
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.38858
Subject(s) - aqueous solution , adsorption , straw , kinetics , chemistry , fourier transform infrared spectroscopy , nuclear chemistry , succinic anhydride , succinic acid , fiber , materials science , chemical engineering , polymer chemistry , organic chemistry , inorganic chemistry , physics , quantum mechanics , engineering
Abstract Two kinds of adsorbents were prepared by modification of wheat straw using succinic anhydride and acrylic acid. The two adsorbents were characterized by Fourier transform infrared spectroscopy, and it was found that the carboxyl groups were introduced into the straw fiber. The use of the modified wheat straws for the removal of low concentration Cr(VI) from aqueous solutions were investigated with a variety of pH value, temperature, contact time, adsorbent dosages, and initial Cr(VI) concentration. The removal percentage achieved 99.7% at an initial Cr(VI) concentration of 1 mg/L. The adsorption kinetics experiments were carried out, and the obtained data were fitted by the pseudo‐first‐order equation, pseudo‐second‐order equation, and intra‐particle diffusion equation. The adsorption kinetics was found to conform to the pseudo‐second‐order equation with a good correlation. This study reports that the modified wheat straws are better absorbents for the removal of low concentration Cr(VI) from aqueous solutions than crude wheat straw. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013