Journal
WATER SCIENCE AND TECHNOLOGY
Volume 76, Issue 1, Pages 192-200Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2017.204
Keywords
arsenic removal; ball milling; Fe-FeS2 adsorbent; iron; pyrite
Funding
- Special Program on Environmental Protection for Public Welfare [201509050]
- project of Innovationdriven Plan in Central South University [2015CX001]
- Natural Science Foundation of China [51474247, 51634010]
- Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources
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Arsenic is one of the major pollutants and a worldwide concern because of its toxicity and chronic effects on human health. An adsorbent of Fe-FeS2 mixture for effective arsenic removal was successfully prepared by mechanical ball milling. The products before and after arsenic adsorption were characterized with scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The adsorbent shows high arsenic removal efficiency when molar ratio of iron to pyrite is 5:5. The experimental data of As(III) adsorption are fitted well with the Langmuir isotherm model with a maximal adsorption capacity of 101.123 mg/g. And As(V) data were described perfectly by the Freundlich model with a maximal adsorption capacity of 58.341 L/mg. As(III) is partial oxidized to As(V) during the adsorption process. High arsenic uptake capability and cost-effectiveness of waste make it potentially attractive for arsenic removal.
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