Journal
CHEMOSPHERE
Volume 152, Issue -, Pages 415-422Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.03.015
Keywords
NiFe-LDH; Anions exchange; Charge density; Methyl orange (MO); Cr(VI)
Categories
Funding
- National Natural Science Foundation of China [11544010, 11304405, 51472038, 51502030, 11547305]
- Nature Science Foundation of Chongqing [cstc2013jcyjA50031]
- Fundamental Research Funds for the Central Universities [CDJZR14135502, CQDXWL2012017, 106112015CDJXY300 002]
- Sharing Fund of Large-scale Equipment of Chongqing University [201512150017, 201512150029, 201512150030]
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The NiFe layered double hydroxides (LDHs) with different mole ratio of Ni/Fe (4:1, 3:1, 7:3 and 1:1) were prepared by a simple coprecipitation method. The adsorption performance were evaluated by the removal of methyl orange (MO) dye and hexavalent chromium(VI) heavy metal ion. It is found that Ni4Fe1-LDH can remove more than 92% of MO in 10 min at the 10 mg/L MO initial concentration, and 97% of Cr(VI) in 1 hat 4 mg/L Cr2O72- initial concentration. The saturated adsorption capacity of Ni4Fe1-LDH is found to be as large as 205.76 mg/g for MO and 26.78 mg/g for Cr(VI). The adsorption behavior of this new adsorbent is fitted well with Langmuir isotherm and the pseudo-second-order kinetic model, indicative of a monolayer and chemical adsorption that synergistically originates from exchangeable anions mechanism and layer charge density. Due to the excellent removal capacity of MO and Cr(VI), the NiFe-LDHs could be a promising adsorbent for wastewater treatment. (C) 2016 Elsevier Ltd. All rights reserved.
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