文章基本信息

标题：Utilization of Calcined Sandstone and Calcined Laterite as an Adsorbent for the Removal of Arsenic from Water
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作者：N’Da Akoua Alice Koua-Koffi ; Lassina Sandotin Coulibaly ; Lydie Clarisse Mangoua-Allali 等
期刊名称：Journal of Environment and Earth Science
印刷版ISSN：2225-0948
电子版ISSN：2225-0948
出版年度：2018
卷号：8
期号：11
页码：81-93
语种：English
出版社：The International Institute for Science, Technology and Education (IISTE)
摘要：Calcined sandstone and calcined laterite were tested as adsorbent at a low cost for the removal of arsenic (As) from the drinking water. The natural materials were collected in Côte d'Ivoire, washed and then dried at a temperature of 60 ° C and finally calcined in an oven at the atmospheric air in several temperatures 300 ° C, 400 ° C, 500 ° C, 600 ° C and 700 ° C. The study of adsorption of the arsenic was realized for the various adsorbates. It showed that the biggest efficiency of the elimination was attributed to the calcined sandstone to 300°C and 400°C for laterite during 2h with a percentage that reached 99.4 %. At this calcination temperature, amount of arsenic in treated water, satisfying the World Health Organization (WHO) standard for drinking water at initial arsenic concentrations greater than 5 mg/L. The chemical composition of the obtained adsorbs was analyzed by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) and thermal analysis (TGA-DSC). Adsorption has been described by the pseudo-second-order model. Calcination of sandstone and laterite increases the adsorption of arsenic on the materials.
关键词：Arsenic; calcined sandstone; calcined laterite; adsorption; temperature.