Kinetics of Arsenic Removal in Waste Acid by the Combination of CuSO4 and Zero-Valent Iron

In this study, we investigated the kinetics of arsenic removal from waste acid by the combination of zero-valent iron (ZVI) and CuSO4. ZVI samples were characterized by X-ray diffraction and scanning electron microscopy before and after arsenic removal; the results showed that after the arsenic remo...

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Bibliographic Details
Published in:Processes 2019-07, Vol.7 (7), p.401
Main Authors: Xi, Yunhao, Luo, Yongguang, Zou, Jingtian, Li, Jing, Liao, Tianqi, Zhang, Libo, Wang, Chen, Li, Xiteng, Lin, Guo
Format: Article
Language:English
Subjects:
Adsorption
Arsenic
Arsenic removal
Chemical precipitation
Chemical reactions
Copper sulfate
Diffusion layers
Drinking water
Efficiency
Experiments
Iron
Kinetics
Magnetite
Methods
Pore size
Reagents
Scanning electron microscopy
Shrinking core model
Spectrum analysis
X-ray diffraction
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Summary:In this study, we investigated the kinetics of arsenic removal from waste acid by the combination of zero-valent iron (ZVI) and CuSO4. ZVI samples were characterized by X-ray diffraction and scanning electron microscopy before and after arsenic removal; the results showed that after the arsenic removal reaction, As2O3 and magnetite phases were detected on the surface of these samples. Kinetic studies were carried out under different reaction temperatures, with different CuSO4 concentrations, and with different iron to arsenic molar ratios (Fe/As). The kinetic data of the arsenic removal were fitted to different kinetic models. The fitting results showed that the arsenic removal process could be described by the shrinking core model, controlled by residual layer diffusion. The apparent activation energy of the reaction was 9.0628 kJ/mol, the reaction order with the CuSO4 concentrations was −0.12681, and the reaction order with the molar ratio of iron to arsenic (Fe/As) was 3.152.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr7070401