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Degradation of 4-chlorophenol in wastewater by organic oxidants / Swati Sharma in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3094–3098 Titre : Degradation of 4-chlorophenol in wastewater by organic oxidants Type de document : texte imprimé Auteurs : Swati Sharma, Auteur ; Mausumi Mukhopadhyay, Auteur ; V. P. Murthy, Auteur Année de publication : 2010 Article en page(s) : pp. 3094–3098 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Chlorophenol  Wastewater  Organic  Oxidants Résumé : The objective of this work was to investigate degradation and mineralization of model compound 4-chlorophenol (4-CP) using advanced oxidation processes (AOPs). This work focused on the degradation of 4-CP by UV and organic oxidants, such as peroxy acetic acid (PAA), p-nitrobenzoic acid (PNBA), and methyl ethyl ketone peroxide (MEKP), in combination. It was observed that maximum degradation of 4-CP by organic oxidants occurred within the first 10 min. PAA was found to be the best oxidant of all the organic oxidants used. Experiments were also conducted with varying concentration of PAA. Experimental results demonstrated that UV/PAA facilitated 98% removal/mineralization of 4-CP. Mineralization studies were taken up by chloride ion determination and chemical oxygen demand (COD) measurement. The chloride ion concentration was observed to decrease progressively which indicated degradation and mineralization of 4-CP. The COD declined gradually when PAA and MEKP were used as oxidants. The reactions were also followed by HPLC and GC-MS analysis for residual concentration and identification of intermediates and degradation products, respectively. The degraded compound was identified as 4-methyl-3-penten-2-one. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9018066 [article] Degradation of 4-chlorophenol in wastewater by organic oxidants [texte imprimé] / Swati Sharma, Auteur ; Mausumi Mukhopadhyay, Auteur ; V. P. Murthy, Auteur . - 2010 . - pp. 3094–3098. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3094–3098 Mots-clés : Chlorophenol  Wastewater  Organic  Oxidants Résumé : The objective of this work was to investigate degradation and mineralization of model compound 4-chlorophenol (4-CP) using advanced oxidation processes (AOPs). This work focused on the degradation of 4-CP by UV and organic oxidants, such as peroxy acetic acid (PAA), p-nitrobenzoic acid (PNBA), and methyl ethyl ketone peroxide (MEKP), in combination. It was observed that maximum degradation of 4-CP by organic oxidants occurred within the first 10 min. PAA was found to be the best oxidant of all the organic oxidants used. Experiments were also conducted with varying concentration of PAA. Experimental results demonstrated that UV/PAA facilitated 98% removal/mineralization of 4-CP. Mineralization studies were taken up by chloride ion determination and chemical oxygen demand (COD) measurement. The chloride ion concentration was observed to decrease progressively which indicated degradation and mineralization of 4-CP. The COD declined gradually when PAA and MEKP were used as oxidants. The reactions were also followed by HPLC and GC-MS analysis for residual concentration and identification of intermediates and degradation products, respectively. The degraded compound was identified as 4-methyl-3-penten-2-one. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9018066

Prunus domestica fruit extract-mediated synthesis of gold nanoparticles and its catalytic activity for 4-nitrophenol reduction / Preeti Dauthal in Industrial & engineering chemistry research, Vol. 51 N° 40 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13014-13020 Titre : Prunus domestica fruit extract-mediated synthesis of gold nanoparticles and its catalytic activity for 4-nitrophenol reduction Type de document : texte imprimé Auteurs : Preeti Dauthal, Auteur ; Mausumi Mukhopadhyay, Auteur Année de publication : 2012 Article en page(s) : pp. 13014-13020 Note générale : industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst  activity  Nanoparticle  Extract Résumé : Gold nanoparticles (Au-NPs) were synthesized at room temperature using Prunus domestica (plum) fruit extract as reducing agent. The UV―visible absorption spectrum showed a characteristic optical absorption peak of Au-NPs at 543 nm. The X-ray diffraction pattern suggested the formation and crystallinity of Au-NPs. Spherical Au-NPs synthesized with an average particle size of 20 ± 6 nm were confirmed by transmission electron microscopy. Fourier transform infrared spectroscopy analysis supported the role of water-soluble polyols and amino adds of plum fruit extract for bioreduction and stabilization of Au-NPs. The catalytic activity of Au-NPs was investigated for 4-nitrophenol (4-NP) reduction using UV―visible absorption spectroscopy. Biosynthesized Au-NPs showed a dose-dependent catalytic activity. Catalytic reduction followed pseudo-first-order kinetics with respect to 4-NP. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451450 [article] Prunus domestica fruit extract-mediated synthesis of gold nanoparticles and its catalytic activity for 4-nitrophenol reduction [texte imprimé] / Preeti Dauthal, Auteur ; Mausumi Mukhopadhyay, Auteur . - 2012 . - pp. 13014-13020. industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13014-13020 Mots-clés : Catalyst  activity  Nanoparticle  Extract Résumé : Gold nanoparticles (Au-NPs) were synthesized at room temperature using Prunus domestica (plum) fruit extract as reducing agent. The UV―visible absorption spectrum showed a characteristic optical absorption peak of Au-NPs at 543 nm. The X-ray diffraction pattern suggested the formation and crystallinity of Au-NPs. Spherical Au-NPs synthesized with an average particle size of 20 ± 6 nm were confirmed by transmission electron microscopy. Fourier transform infrared spectroscopy analysis supported the role of water-soluble polyols and amino adds of plum fruit extract for bioreduction and stabilization of Au-NPs. The catalytic activity of Au-NPs was investigated for 4-nitrophenol (4-NP) reduction using UV―visible absorption spectroscopy. Biosynthesized Au-NPs showed a dose-dependent catalytic activity. Catalytic reduction followed pseudo-first-order kinetics with respect to 4-NP. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451450