Efficient nitrate removal by Ca-treated activated carbon derived from agricultural residues
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Publication Details
Author list: Goto T., Dolphen R., Amano Y., Thiravetyan P., Machida M.
Publisher: Taylor & Francis: STM, Behavioural Science and Public Health Titles
Publication year: 2017
Journal: Desalination and Water Treatment (1944-3994)
Volume number: 59
Start page: 287
End page: 294
Number of pages: 8
ISSN: 1944-3994
eISSN: 1944-3986
Languages: English-Great Britain (EN-GB)
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Abstract
Various agricultural residues such as bamboo chips, bagasse bottom ashes, corncobs and macadamia nutshells were used to prepare activated carbon by steam activation. These materials were further treated by Ca(OH)2 and HCl solution, and the sample originated from bamboo was the best for nitrate removal from water. In addition, the bamboo activated carbon was treated with high concentrations of CaCl2 and HCl solution (BC-CL-A), showing a greater adsorption amount for nitrate removal. BC-CL-A exhibited a nitrate adsorption capacity (0.45 mmol g–1) approximately twice as much as that of the untreated sample. The nitrate adsorbed on BC-CL-A was easily desorbed from the surface by KCl solution due to ion exchange between NO3 – and Cl–. Regeneration test for BC-CL-A by KCl solution was also examined. After three cycles of regeneration, the adsorbed nitrate could be removed by 88.6%, implying that some nitrates were irreversibly adsorbed on BC-CL-A. © 2017 Desalination Publications. All rights reserved.
Keywords
Ion exchange
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