Documents disponibles écrits par cet auteur

Application of cellulose - clay composite biosorbent toward the effective adsorption and removal of chromium from industrial wastewater / A. Santhana Krishna Kumar 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. 58–69 Titre : Application of cellulose - clay composite biosorbent toward the effective adsorption and removal of chromium from industrial wastewater Type de document : texte imprimé Auteurs : A. Santhana Krishna Kumar, Auteur ; S. Kalidhasan, Auteur ; Vidya Rajesh, Auteur Année de publication : 2012 Article en page(s) : pp. 58–69 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biosorbent  Adsorption Résumé : Biopolymer composites are known for their utility in diverse applications. In this paper, we report an effective methodology for the detoxification of chromium using cellulose-montmorillonite composite material as the adsorbent. The interaction of surfactant modified sodium montmorillonite (NaMMT) with cellulose biopolymer is followed by the subsequent adsorption of Cr(VI) from aqueous solution as bichromate anion onto the surface of the biocomposite material. The composite adsorbent was characterized comprehensively using Fourier transform infrared spectroscopy (FT-IR), Energy dispersive X-ray spectrometry (EDX), X-ray diffraction (XRD) and Branauer-Emmett-Teller (BET) isotherm studies. The material exhibited a maximum adsorption capacity of 22.2 mg g–1 in accordance with the Langmuir isotherm model. The mesoporous nature of the material was ascertained from the nitrogen adsorption isotherm study and the adsorption process was in accordance with second order kinetics. The spontaneity of the adsorption process could be confirmed from the study of the adsorption thermodynamics. The composite material could be regenerated using sodium hydroxide as the eluent. The adsorbent could be reused with quantitative recovery for 10 adsorption–desorption cycles. An aqueous phase feed volume of 400 mL could be quantitatively treated by column method at 100 mg L–1 concentration of Cr(VI) with a preconcentration factor of 50. The applicability of the method is demonstrated in the quantitative removal of total chromium from a chrome tannery effluent sample. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201349h [article] Application of cellulose - clay composite biosorbent toward the effective adsorption and removal of chromium from industrial wastewater [texte imprimé] / A. Santhana Krishna Kumar, Auteur ; S. Kalidhasan, Auteur ; Vidya Rajesh, Auteur . - 2012 . - pp. 58–69. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 58–69 Mots-clés : Biosorbent  Adsorption Résumé : Biopolymer composites are known for their utility in diverse applications. In this paper, we report an effective methodology for the detoxification of chromium using cellulose-montmorillonite composite material as the adsorbent. The interaction of surfactant modified sodium montmorillonite (NaMMT) with cellulose biopolymer is followed by the subsequent adsorption of Cr(VI) from aqueous solution as bichromate anion onto the surface of the biocomposite material. The composite adsorbent was characterized comprehensively using Fourier transform infrared spectroscopy (FT-IR), Energy dispersive X-ray spectrometry (EDX), X-ray diffraction (XRD) and Branauer-Emmett-Teller (BET) isotherm studies. The material exhibited a maximum adsorption capacity of 22.2 mg g–1 in accordance with the Langmuir isotherm model. The mesoporous nature of the material was ascertained from the nitrogen adsorption isotherm study and the adsorption process was in accordance with second order kinetics. The spontaneity of the adsorption process could be confirmed from the study of the adsorption thermodynamics. The composite material could be regenerated using sodium hydroxide as the eluent. The adsorbent could be reused with quantitative recovery for 10 adsorption–desorption cycles. An aqueous phase feed volume of 400 mL could be quantitatively treated by column method at 100 mg L–1 concentration of Cr(VI) with a preconcentration factor of 50. The applicability of the method is demonstrated in the quantitative removal of total chromium from a chrome tannery effluent sample. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201349h

A Meticulous study on the adsorption of mercury as tetrachloromercurate(II) anion with trioctylamine modified sodium montmorillonite and its application to a coal fly ash sample / A. Santhana Krishna Kumar in Industrial & engineering chemistry research, Vol. 51 N° 35 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11312-11327 Titre : A Meticulous study on the adsorption of mercury as tetrachloromercurate(II) anion with trioctylamine modified sodium montmorillonite and its application to a coal fly ash sample Type de document : texte imprimé Auteurs : A. Santhana Krishna Kumar, Auteur ; S. Kalidhasan, Auteur ; Vidya Rajesh, Auteur Année de publication : 2012 Article en page(s) : pp. 11312-11327 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fly  ash  Coal  Montmorillonite  Adsorption Résumé : Clay materials have hogged the limelight for their effectiveness in environmental remediation. In this paper, we report an effective solid phase extraction method for mercury based on the adsorption of tetrachloromercurate(II) anion with trioctylamine intercalated onto sodium montmorillonite. The adsorption is facile in acidic medium, and the adsorbent was well characterized by diverse physicochemical and spectroscopic techniques. Various isotherm models were employed to correlate the experimental adsorption data. The electrostatic interaction between HgCl42― and the protonated amine is well supported by a Langmuir isotherm model with a maximum adsorption capacity of 140.84 mg g―1. The ordered transition state that arises due to the proximity of the HgCl42― and the positively charged amine is accompanied by a decrease in the translational entropy of the system. The N2 adsorption-desorption isotherm study revealed the mesoporous nature of the adsorbent, and the thermodynamically favorable adsorption process resonates well with the ensuing negative free energy and enthalpy changes in accordance with the sorption mechanism. Packed bed column study demonstrated the scale up to 800 mL sample volume at 10 mg L―1 Hg(II) concentration, and the adsorbent could be regenerated and reused for 10 cycles with thiourea as the eluent. The removal of mercury from a coal fly ash sample validated the method. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324779 [article] A Meticulous study on the adsorption of mercury as tetrachloromercurate(II) anion with trioctylamine modified sodium montmorillonite and its application to a coal fly ash sample [texte imprimé] / A. Santhana Krishna Kumar, Auteur ; S. Kalidhasan, Auteur ; Vidya Rajesh, Auteur . - 2012 . - pp. 11312-11327. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11312-11327 Mots-clés : Fly  ash  Coal  Montmorillonite  Adsorption Résumé : Clay materials have hogged the limelight for their effectiveness in environmental remediation. In this paper, we report an effective solid phase extraction method for mercury based on the adsorption of tetrachloromercurate(II) anion with trioctylamine intercalated onto sodium montmorillonite. The adsorption is facile in acidic medium, and the adsorbent was well characterized by diverse physicochemical and spectroscopic techniques. Various isotherm models were employed to correlate the experimental adsorption data. The electrostatic interaction between HgCl42― and the protonated amine is well supported by a Langmuir isotherm model with a maximum adsorption capacity of 140.84 mg g―1. The ordered transition state that arises due to the proximity of the HgCl42― and the positively charged amine is accompanied by a decrease in the translational entropy of the system. The N2 adsorption-desorption isotherm study revealed the mesoporous nature of the adsorbent, and the thermodynamically favorable adsorption process resonates well with the ensuing negative free energy and enthalpy changes in accordance with the sorption mechanism. Packed bed column study demonstrated the scale up to 800 mL sample volume at 10 mg L―1 Hg(II) concentration, and the adsorbent could be regenerated and reused for 10 cycles with thiourea as the eluent. The removal of mercury from a coal fly ash sample validated the method. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324779