Documents disponibles écrits par cet auteur

Adsorptive removal of fluoride by micro-nanohierarchal web of activated carbon fibers / Amit Kumar Gupta in Industrial & engineering chemistry research, Vol. 48 N° 21 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9697–9707 Titre : Adsorptive removal of fluoride by micro-nanohierarchal web of activated carbon fibers Type de document : texte imprimé Auteurs : Amit Kumar Gupta, Auteur ; Dinesh Deva, Auteur ; Ashutosh Sharma, Auteur Année de publication : 2010 Article en page(s) : pp. 9697–9707 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Activated  carbon  fibers  Aluminum  impregnated  hierarchal  web  Chemical  vapor  deposition Résumé : This study describes the development of aluminum impregnated hierarchal web of carbon fibers for the removal of dissolved fluoride in water. Micrometer-sized activated carbon fibers (ACF) were used as a substrate to grow carbon nanofibers (CNF) by chemical vapor deposition (CVD) using Ni as a catalyst. The hierarchal web of micro-nanocarbon fibers (ACF/CNF) thus prepared was impregnated with aluminum (in its metallic state) and then tested for the adsorption of fluoride ions over the concentration range of 1−50 ppm in water under both batch and flow conditions. The adsorbent web showed significant adsorption of fluoride ions. In addition, the total fluoride uptake was observed to be larger on aluminum impregnated ACF/CNF web than on its parent material, the ACF alone impregnated with Al. Various analytical techniques including the scanning electron microscopy (SEM), Raman spectroscopy, and the elemental analyzer were employed to characterize the Al-impregnated ACF/CNF. The SEM images showed a complex 3D network of nanofibers uniformly deposited with Al. This study is a step in developing a general platform suitable for producing potable water that also specifically addresses the problem of fluoride removal. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801688k [article] Adsorptive removal of fluoride by micro-nanohierarchal web of activated carbon fibers [texte imprimé] / Amit Kumar Gupta, Auteur ; Dinesh Deva, Auteur ; Ashutosh Sharma, Auteur . - 2010 . - pp. 9697–9707. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9697–9707 Mots-clés : Activated  carbon  fibers  Aluminum  impregnated  hierarchal  web  Chemical  vapor  deposition Résumé : This study describes the development of aluminum impregnated hierarchal web of carbon fibers for the removal of dissolved fluoride in water. Micrometer-sized activated carbon fibers (ACF) were used as a substrate to grow carbon nanofibers (CNF) by chemical vapor deposition (CVD) using Ni as a catalyst. The hierarchal web of micro-nanocarbon fibers (ACF/CNF) thus prepared was impregnated with aluminum (in its metallic state) and then tested for the adsorption of fluoride ions over the concentration range of 1−50 ppm in water under both batch and flow conditions. The adsorbent web showed significant adsorption of fluoride ions. In addition, the total fluoride uptake was observed to be larger on aluminum impregnated ACF/CNF web than on its parent material, the ACF alone impregnated with Al. Various analytical techniques including the scanning electron microscopy (SEM), Raman spectroscopy, and the elemental analyzer were employed to characterize the Al-impregnated ACF/CNF. The SEM images showed a complex 3D network of nanofibers uniformly deposited with Al. This study is a step in developing a general platform suitable for producing potable water that also specifically addresses the problem of fluoride removal. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801688k

Fe-grown carbon nanofibers for removal of arsenic(V) in wastewater / Amit Kumar Gupta in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 7074–7084 Titre : Fe-grown carbon nanofibers for removal of arsenic(V) in wastewater Type de document : texte imprimé Auteurs : Amit Kumar Gupta, Auteur ; Dinesh Deva, Auteur ; Ashutosh Sharma, Auteur Année de publication : 2010 Article en page(s) : pp 7074–7084 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon  Nanofibers  Wastewater. Résumé : An Fe-impregnated hierarchal web of carbon fibers was synthesized and evaluated as an adsorbent for arsenic(V) removal from wastewater. The web was prepared by growing carbon nanofibers (CNFs) on the activated carbon microfibers (ACFs) by chemical vapor deposition (CVD) using Fe as a catalyst. Fe was found to play a bifunctional role in the development of the micro-/nanoweb of carbon fibers: (1) as a catalyst for growing CNFs and (2) as an adsorbent for removing arsenic(V) from water. The method of preparation consisted of impregnation of substrate ACFs with ferric chloride, calcinations followed by reduction to convert oxides of Fe to the metallic state, growth of CNFs by CVD, and subsequent mild sonication of the web to open its pore spaces. The Fe-impregnated adsorbent was tested for the removal of arsenic(V) over the concentration range of 1−50 mg/L in water under both batch and flow conditions. The results showed comparable or greater removal of arsenic(V) compared to that obtained with commercial adsorbents. The prepared adsorbent was characterized by various analytical techniques such as BET area and pore size distribution (PSD), elemental analysis, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100392q [article] Fe-grown carbon nanofibers for removal of arsenic(V) in wastewater [texte imprimé] / Amit Kumar Gupta, Auteur ; Dinesh Deva, Auteur ; Ashutosh Sharma, Auteur . - 2010 . - pp 7074–7084. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 7074–7084 Mots-clés : Carbon  Nanofibers  Wastewater. Résumé : An Fe-impregnated hierarchal web of carbon fibers was synthesized and evaluated as an adsorbent for arsenic(V) removal from wastewater. The web was prepared by growing carbon nanofibers (CNFs) on the activated carbon microfibers (ACFs) by chemical vapor deposition (CVD) using Fe as a catalyst. Fe was found to play a bifunctional role in the development of the micro-/nanoweb of carbon fibers: (1) as a catalyst for growing CNFs and (2) as an adsorbent for removing arsenic(V) from water. The method of preparation consisted of impregnation of substrate ACFs with ferric chloride, calcinations followed by reduction to convert oxides of Fe to the metallic state, growth of CNFs by CVD, and subsequent mild sonication of the web to open its pore spaces. The Fe-impregnated adsorbent was tested for the removal of arsenic(V) over the concentration range of 1−50 mg/L in water under both batch and flow conditions. The results showed comparable or greater removal of arsenic(V) compared to that obtained with commercial adsorbents. The prepared adsorbent was characterized by various analytical techniques such as BET area and pore size distribution (PSD), elemental analysis, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100392q