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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

Kinetic study and optimization of oxidative desulfurization of benzothiophene using mesoporous titanium silicate - 1 catalyst / Aryav Sengupta in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 147–157 Titre : Kinetic study and optimization of oxidative desulfurization of benzothiophene using mesoporous titanium silicate - 1 catalyst Type de document : texte imprimé Auteurs : Aryav Sengupta, Auteur ; Prashant D. Kamble, Auteur ; Jayanta Kumar Basu, Auteur Année de publication : 2012 Article en page(s) : pp. 147–157 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetic  Optimization  Mesoporous Résumé : The oxidative desulfurization (ODS) of benzothiophene (BT) in isooctane as a model fuel with 30% aqueous H2O2 was studied using three different titanium silicate (TS) zeolites, synthesized mesoporous TS-1, synthesized mesoporous titanium beta, and commercial TS-1 catalyst, which were found to give 85.6, 45.74, and 25.31% conversions, respectively. Therefore, mesoporous TS-1 was selected as the catalyst for ODS of BT. Reaction time, temperature, catalyst loading, and molar ratio of H2O2:S were selected as the pertinent parameters for the optimization of conversion based on the Box–Behnken design. The predicted maximum conversion was observed to be 89.9% at a temperature of 60 °C, catalyst loading of 0.064 g, and mole ratio of BT and H2O2 of 0.209. An empirical kinetic model was used to fit the rate data. The activation energy was found to be 25.20 kJ/mol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024068 [article] Kinetic study and optimization of oxidative desulfurization of benzothiophene using mesoporous titanium silicate - 1 catalyst [texte imprimé] / Aryav Sengupta, Auteur ; Prashant D. Kamble, Auteur ; Jayanta Kumar Basu, Auteur . - 2012 . - pp. 147–157. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 147–157 Mots-clés : Kinetic  Optimization  Mesoporous Résumé : The oxidative desulfurization (ODS) of benzothiophene (BT) in isooctane as a model fuel with 30% aqueous H2O2 was studied using three different titanium silicate (TS) zeolites, synthesized mesoporous TS-1, synthesized mesoporous titanium beta, and commercial TS-1 catalyst, which were found to give 85.6, 45.74, and 25.31% conversions, respectively. Therefore, mesoporous TS-1 was selected as the catalyst for ODS of BT. Reaction time, temperature, catalyst loading, and molar ratio of H2O2:S were selected as the pertinent parameters for the optimization of conversion based on the Box–Behnken design. The predicted maximum conversion was observed to be 89.9% at a temperature of 60 °C, catalyst loading of 0.064 g, and mole ratio of BT and H2O2 of 0.209. An empirical kinetic model was used to fit the rate data. The activation energy was found to be 25.20 kJ/mol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024068