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Development of a treated laterite for arsenic adsorption / Abhijit Maiti in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4873–4886 Titre : Development of a treated laterite for arsenic adsorption : effects of treatment parameters Type de document : texte imprimé Auteurs : Abhijit Maiti, Auteur ; Jayanta Kumar Basu, Auteur ; Sirshendu De, Auteur Année de publication : 2010 Article en page(s) : pp. 4873–4886 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Arsenic  adsorbent Résumé : A porous and efficient arsenic adsorbent (specific surface area, 181 ± 4 m2/g; pore volume, 0.35 ± 0.01 mL/g) is prepared from raw laterite by acid followed by alkali treatment. FTIR, XRD, SEM-EDAX, HRTEM, and a surface area analyzer are used for detailed characterization of treated materials. Adsorption of arsenic on treated laterite (TL) using arsenic spiked distilled water and contaminated groundwater (CGW) is studied in the batch and fixed-bed column modes. The Langmuir isotherm fits better to the experimental data compared to the Freundlich isotherm. The Langmuir maximum capacities of As(V) and As(III) on the best-performing treated material are found to be 24.8 ± 3.9 and 8.0 ± 1.4 mg/g, respectively. Arsenic adsorption on TL follows pseudo-second-order kinetics. The Langmuir maximum adsorptions of arsenic on raw laterite and TL using CGW as the total arsenic are found to be 0.11 ± 0.01 and 7.5 ± 0.4 mg/g, respectively. In the fixed-bed column run, the 6.5 cm TL bed is capable to produce 3000 times the bed volume of treated water with an effluent arsenic concentration <10 μg/L using CGW as an influent. The arsenic adsorption capacity of TL is found to be 30 to 40 times higher compared to that of raw laterite. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100612u [article] Development of a treated laterite for arsenic adsorption : effects of treatment parameters [texte imprimé] / Abhijit Maiti, Auteur ; Jayanta Kumar Basu, Auteur ; Sirshendu De, Auteur . - 2010 . - pp. 4873–4886. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4873–4886 Mots-clés : Arsenic  adsorbent Résumé : A porous and efficient arsenic adsorbent (specific surface area, 181 ± 4 m2/g; pore volume, 0.35 ± 0.01 mL/g) is prepared from raw laterite by acid followed by alkali treatment. FTIR, XRD, SEM-EDAX, HRTEM, and a surface area analyzer are used for detailed characterization of treated materials. Adsorption of arsenic on treated laterite (TL) using arsenic spiked distilled water and contaminated groundwater (CGW) is studied in the batch and fixed-bed column modes. The Langmuir isotherm fits better to the experimental data compared to the Freundlich isotherm. The Langmuir maximum capacities of As(V) and As(III) on the best-performing treated material are found to be 24.8 ± 3.9 and 8.0 ± 1.4 mg/g, respectively. Arsenic adsorption on TL follows pseudo-second-order kinetics. The Langmuir maximum adsorptions of arsenic on raw laterite and TL using CGW as the total arsenic are found to be 0.11 ± 0.01 and 7.5 ± 0.4 mg/g, respectively. In the fixed-bed column run, the 6.5 cm TL bed is capable to produce 3000 times the bed volume of treated water with an effluent arsenic concentration <10 μg/L using CGW as an influent. The arsenic adsorption capacity of TL is found to be 30 to 40 times higher compared to that of raw laterite. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100612u