Journal
CHEMOSPHERE
Volume 212, Issue -, Pages 408-417Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.08.085
Keywords
Cr(VI) adsorption; Phosphate effect; Aluminum-substituted ferrihydrite; Competitive adsorption; Adsorption mechanism
Categories
Funding
- Natural Science Foundation of Guangdong Province [2018A030313099]
- Science and Technology Planning Project of Guangdong Province [2016A020221032]
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This work aims to explore how phosphate affected hexavalent chromium (Cr(VI)) removal and the interaction between the aluminum-substituted ferrihydrite (shortened as Fh-Al) and Cr(VI) in the presence of phosphate. The adsorption behaviors of Cr(VI) on Fh-Al were tested in a synthetic solution containing Cr(VI) and phosphate. Series of characterization techniques, such as X-ray diffraction analysis, transmission electron microscopy equipped with the energy dispersive X-ray spectroscopy, attenuated total reflection Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy, have been used to analyze the Fh-Al before and after the adsorption of Cr(VI) in the presence of phosphate. Desirable adsorption performances of Cr(VI) occurred at pH value 3.0. Cr(VI) showed low affinity to Fh-Al due to the negative influence of phosphate. Addition of phosphate forced Cr(Vl) out of Fh-Al surfaces like an invader. The adsorption process was better described by the Langmuir isotherm model, and the adsorption capacity of Cr(Vl) in the presence of 93 mg/L phosphate was 42.09 mg/g. The mechanism for Cr(VI) removal by Fh-Al under the influence of phosphate was developed as follows: (1) electrostatic interaction, (2) the formation of Fe-O-Cr complexes, and (3) the formation of ternary complexes between Fh-Al and Cr(VI) using phosphate as medium. (C) 2018 Elsevier Ltd. All rights reserved.
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