Evaluation of iron and manganese-coated pumice application for the removal of as(v) from aqueous solutions

Journal of Environmental Health Science Engineering

Roshan Khoshnavazi²  Masoumeh Heidari¹  Bubak Souri³  Leila Babaie Far³ 

[1] Department of Environmental Sciences, Islamic Azad University, Sanandaj, Iran;Department of Chemistry, Faculty of Basic Sciences, University of Kurdistan, Sanandaj, Iran;Department of Environmental Sciences, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran

关键词: Kinetics;    Manganese-coated pumice;    Iron-coated pumice;    Arsenate;   

Others  :  823965
DOI  :  10.1186/1735-2746-9-21

 received in 2012-12-04, accepted in 2012-12-04,  发布年份 2012

【 摘 要 】

Arsenic contamination of water has been recognized as a serious environmental issue and there are reports on its epidemiological problems to human health. The objective of this study was to evaluate the performances of iron-coated pumice and manganese-coated pumice as the adsorbents for removing arsenate from aqueous solutions. The effect of various parameters such as adsorbent dose, contact time, pH and initial concentration on removal efficiency of arsenate were evaluated in batch mode. The data obtained from the kinetic studies were analyzed using kinetic models of pseudo-first-order and pseudo-second-order. In addition, two isotherm models of Freundlich and Langmuir were used to fit the experimental data. The results showed that the optimum dosage of iron-coated pumice and manganese-coated pumice for arsenate removal were 40 and 80 g/L whereas the adsorption process reached equilibrium after 80 and 100 min, respectively. The maximum removal efficiency of arsenate using the two adsorbents were both recorded in pH=3 as the removal efficiency gradually declined following every increase in pH values of the solution. Iron-coated pumice also showed to have high removal efficiency when the initial concentration of arsenate was high while the low concentration of arsenate was efficiently removed by manganese-coated pumice. Moreover, it was depicted that the adsorption kinetics by both adsorbents followed pseudo-second order equation and the uptake data of arsenate were well fitted with Langmuir isotherm model. Therefore, it could be concluded that iron and manganese-coated pumice could be considered as suitable adsorbents for arsenate removal from aqueous solutions.

【 授权许可】

   
2012 Babaie Far et al.; licensee BioMed Central Ltd.

【 图 表 】

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