The removal of arsenate from water using iron-modified diatomite (D-Fe): isotherm and column experiments
Article
Pantoja Munoz, L., Jones, H., Garelick, H., Mohamedbakr, H. and Burkitbayev, M. 2014. The removal of arsenate from water using iron-modified diatomite (D-Fe): isotherm and column experiments. Environmental Science and Pollution Research. 21 (1), pp. 495-506. https://doi.org/10.1007/s11356-013-1891-7
Type | Article |
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Title | The removal of arsenate from water using iron-modified diatomite (D-Fe): isotherm and column experiments |
Authors | Pantoja Munoz, L., Jones, H., Garelick, H., Mohamedbakr, H. and Burkitbayev, M. |
Abstract | Iron hydroxide supported onto porous diatomite (D-Fe) is a low-cost material with potential to remove arsenic from contaminated water due to its affinity for the arsenate ion. This affinity was tested under varying conditions of pH, contact time, iron content in D-Fe and the presence of competitive ions, silicate and phosphate. Batch and column experiments were conducted to derive adsorption isotherms and breakthrough behaviours (50 μg L−1) for an initial concentration of 1,000 μg L−1. Maximum capacity at pH 4 and 17 % iron was 18.12–40.82 mg of arsenic/g of D-Fe and at pH 4 and 10 % iron was 18.48–29.07 mg of arsenic/g of D-Fe. Adsorption decreased in the presence of phosphate and silicate ions. The difference in column adsorption behaviour between 10 % and 17 % iron was very pronounced, outweighing the impact of all other measured parameters. There was insufficient evidence of a correlation between iron content and arsenic content in isotherm experiments, suggesting that ion exchange is a negligible process occurring in arsenate adsorption using D-Fe nor is there co-precipitation of arsenate by rising iron content of the solute above saturation. |
Keywords | Arsenic; Diatomite; Adsorption; Isotherm; Iron oxide; Column; Competitive ions |
Publisher | Springer |
Journal | Environmental Science and Pollution Research |
ISSN | 0944-1344 |
Electronic | 1614-7499 |
Publication dates | |
Online | 27 Jun 2013 |
31 Jan 2014 | |
Publication process dates | |
Deposited | 18 Nov 2013 |
Accepted | 30 May 2013 |
Submitted | 30 Jan 2013 |
Output status | Published |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s11356-013-1891-7 |
Web of Science identifier | WOS:000329095300045 |
Language | English |
https://repository.mdx.ac.uk/item/848w5
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