Arsenic sorption by red mud-modified biochar produced from rice straw

Chuan WU, Liu HUANG, Sheng-Guo XUE, Yu-Ying HUANG, William HARTLEY, Meng-qian CUI, Ming Hung WONG

Research output: Contribution to journalArticles

36 Citations (Scopus)

Abstract

Red mud-modified biochar (RM-BC) has been produced to be utilized as a novel adsorbent to remove As because it can effectively combine the beneficial features of red mud (rich metal oxide composition and porous structure) and biochar (large surface area and porous structure properties). SEM-EDS and XRD analyses demonstrated that red mud had loaded successfully on the surface of biochar. With the increasing of pH in solution, arsenate (As(V)) adsorption on RM-BC decreased while arsenite (As(III)) increased. Arsenate adsorption kinetics process on RM-BC fitted the pseudo-second-order model, while that of As(III) favored the Elovich model. All sorption isotherms produced superior fits with the Langmuir model. RM-BC exhibited improved As removal capabilities, with a maximum adsorption capacity (Qmax) for As(V) of 5923 μg g⁻¹, approximately ten times greater than that of the untreated BC (552.0 μg g⁻¹). Furthermore, it has been indicated that the adsorption of As(V) on RM-BC may be strongly associated with iron oxides (hematite and magnetite) and aluminum oxides (gibbsite) by X-ray absorption near-edge spectroscopy (XANES), which was possibly because of surface complexation and electrostatic interactions. RM-BC may be used as a valuable adsorbent for removing As in the environment due to the waste materials being relatively abundant. Copyright © 2017 Springer-Verlag GmbH Germany.
Original languageEnglish
Pages (from-to)18168-18178
JournalEnvironmental Science and Pollution Research
Volume24
Issue number22
Early online dateJun 2017
DOIs
Publication statusPublished - 2017

Citation

Wu, C., Huang, L., Xue, S.-G., Huang, Y.-Y., Hartley, W., Cui, M.-q., et al. (2017). Arsenic sorption by red mud-modified biochar produced from rice straw. Environmental Science and Pollution Research, 24(22), 18168–18178.

Keywords

  • Red mud
  • Biochar
  • Arsenate
  • Hematite
  • Magnetite
  • Gibbsite

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