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Arsenate removal from aqueous media by nanosized hydrated ferric oxide (HFO)-loaded polymeric sorbents / Qingjian Zhang in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3957–3962 Titre : Arsenate removal from aqueous media by nanosized hydrated ferric oxide (HFO)-loaded polymeric sorbents : effect of HFO loadings Type de document : texte imprimé Auteurs : Qingjian Zhang, Auteur ; Bingcai Pan, Auteur ; Weiming Zhang, Auteur ; Bingjun Pan, Auteur Année de publication : 2008 Article en page(s) : p. 3957–3962 Note générale : Bibliogr. p. 3961-3962 Langues : Anglais (eng) Mots-clés : HFO;  Arsenate  sorption;  Aqueous  solution Résumé : Hydrated ferric oxide-loaded hybrid sorbents are of considerable concern for arsenic removal from waters. In the current study, several nanosized hydrated ferric oxide (HFO)-loaded polymer sorbents were prepared and assayed to examine the effect of HFO loadings on arsenate sorption from aqueous solution. Batch and column sorption studies showed that the sorption capacity of arsenate increased with the increase of HFO loadings from 3 to 15% (in Fe mass); however, a further increase in the HFO loadings resulted in a dramatic decrease of the sorption capacity. At relatively low arsenate levels (e.g., <1 mg/L), sorbents with lower HFO loadings exhibited higher distribution coefficients (Kd) than others, implying that HFO loaded at a relatively lower level exhibits stronger sorption affinity toward arsenate than the larger one. However, at relatively high arsenate levels, the sorbent with HFO loading of 15% displayed the highest sorption capacity. Additionally, all the exhausted sorbents are amenable to an efficient regeneration by a mixed NaOH−NaCl solution irrespective of their HFO loadings. The results obtained in the current study may serve as a reference for preparation of other hybrid sorbents with similar structures, i.e., composites of nanosized metal (hydro)oxide particles and porous substrates. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800275k [article] Arsenate removal from aqueous media by nanosized hydrated ferric oxide (HFO)-loaded polymeric sorbents : effect of HFO loadings [texte imprimé] / Qingjian Zhang, Auteur ; Bingcai Pan, Auteur ; Weiming Zhang, Auteur ; Bingjun Pan, Auteur . - 2008 . - p. 3957–3962. Bibliogr. p. 3961-3962 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3957–3962 Mots-clés : HFO;  Arsenate  sorption;  Aqueous  solution Résumé : Hydrated ferric oxide-loaded hybrid sorbents are of considerable concern for arsenic removal from waters. In the current study, several nanosized hydrated ferric oxide (HFO)-loaded polymer sorbents were prepared and assayed to examine the effect of HFO loadings on arsenate sorption from aqueous solution. Batch and column sorption studies showed that the sorption capacity of arsenate increased with the increase of HFO loadings from 3 to 15% (in Fe mass); however, a further increase in the HFO loadings resulted in a dramatic decrease of the sorption capacity. At relatively low arsenate levels (e.g., <1 mg/L), sorbents with lower HFO loadings exhibited higher distribution coefficients (Kd) than others, implying that HFO loaded at a relatively lower level exhibits stronger sorption affinity toward arsenate than the larger one. However, at relatively high arsenate levels, the sorbent with HFO loading of 15% displayed the highest sorption capacity. Additionally, all the exhausted sorbents are amenable to an efficient regeneration by a mixed NaOH−NaCl solution irrespective of their HFO loadings. The results obtained in the current study may serve as a reference for preparation of other hybrid sorbents with similar structures, i.e., composites of nanosized metal (hydro)oxide particles and porous substrates. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800275k

Effect of CdS distribution on the photocatalytic performance of resin - CdS nanocomposites / Yingmei Xie in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 351–356 Titre : Effect of CdS distribution on the photocatalytic performance of resin - CdS nanocomposites Type de document : texte imprimé Auteurs : Yingmei Xie, Auteur ; Shujuan Zhang, Auteur ; Bingcai Pan, Auteur Année de publication : 2012 Article en page(s) : pp. 351–356 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Shell  thickness  Shell  density  Rhodamin  B  D201-CdS Résumé : A nanocomposite, D201-CdS, made by depositing CdS nanoparticles on a resin support (D201) was found to be a promising photocatalyst with visible light response. To elucidate the structure-activity relationship, a set of D201-CdS nanocomposites varying in CdS amount and distribution were prepared by adjusting the concentration of sulfide anion and the precipitation time. The maximum compressive strength of the nanocomposites increased first with the loading of CdS and then declined with the further increase of CdS. There was a valid shell thickness of CdS due to the limitation of visible light in penetration through the resin matrix. Within a certain range of shell thickness, the increase of shell density of CdS would be favorable for the purpose of photodegradation. The shell density could be easily tuned by adjusting the fabrication condition employed in this work, which is an important merit for the potential production and application. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010643 [article] Effect of CdS distribution on the photocatalytic performance of resin - CdS nanocomposites [texte imprimé] / Yingmei Xie, Auteur ; Shujuan Zhang, Auteur ; Bingcai Pan, Auteur . - 2012 . - pp. 351–356. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 351–356 Mots-clés : Shell  thickness  Shell  density  Rhodamin  B  D201-CdS Résumé : A nanocomposite, D201-CdS, made by depositing CdS nanoparticles on a resin support (D201) was found to be a promising photocatalyst with visible light response. To elucidate the structure-activity relationship, a set of D201-CdS nanocomposites varying in CdS amount and distribution were prepared by adjusting the concentration of sulfide anion and the precipitation time. The maximum compressive strength of the nanocomposites increased first with the loading of CdS and then declined with the further increase of CdS. There was a valid shell thickness of CdS due to the limitation of visible light in penetration through the resin matrix. Within a certain range of shell thickness, the increase of shell density of CdS would be favorable for the purpose of photodegradation. The shell density could be easily tuned by adjusting the fabrication condition employed in this work, which is an important merit for the potential production and application. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010643

Impregnating zirconium phosphate onto porous polymers for lead removal from waters / Qingrui Zhang in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4495–4499 Titre : Impregnating zirconium phosphate onto porous polymers for lead removal from waters : effect of nanosized particles and polymer chemistry Type de document : texte imprimé Auteurs : Qingrui Zhang, Auteur ; Peijuan Jiang, Auteur ; Bingcai Pan, Auteur Année de publication : 2009 Article en page(s) : pp. 4495–4499 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Polymer-based  zirconium  phosphate  Chloromethylated  polystyrene  Polystyrene  cation  exchange  resin  X-ray  diffraction Résumé : The subject study revealed several unique properties of polymer-based zirconium phosphate (ZrP) for lead removal from waters. ZrP particles were impregnated within two porous polymers, namely, a chloromethylated polystyrene (CP) and a polystyrene cation exchange resin (D-001). Both as-prepared hybrid sorbents (designated ZrP−CP and ZrP−001, respectively) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and a N2 adsorption−desorption test at 77 K. As compared to the fresh particles, ZrP impregnated onto CP exhibits a slight increase in sorption capacity, which may result from their nanosized particles after impregnation. More attractively, ZrP−001 displays much higher sorption preference toward lead ions over calcium ions than ZrP, D-001, and ZrP−CP. Such significant phenomena is mainly attributed to the Donnan membrane effect exerted by the immobilized sulfonate groups on D-001 and further validates its potential application for enhanced removal of the toxic metal from contaminated waters. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8016847 [article] Impregnating zirconium phosphate onto porous polymers for lead removal from waters : effect of nanosized particles and polymer chemistry [texte imprimé] / Qingrui Zhang, Auteur ; Peijuan Jiang, Auteur ; Bingcai Pan, Auteur . - 2009 . - pp. 4495–4499. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4495–4499 Mots-clés : Polymer-based  zirconium  phosphate  Chloromethylated  polystyrene  Polystyrene  cation  exchange  resin  X-ray  diffraction Résumé : The subject study revealed several unique properties of polymer-based zirconium phosphate (ZrP) for lead removal from waters. ZrP particles were impregnated within two porous polymers, namely, a chloromethylated polystyrene (CP) and a polystyrene cation exchange resin (D-001). Both as-prepared hybrid sorbents (designated ZrP−CP and ZrP−001, respectively) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and a N2 adsorption−desorption test at 77 K. As compared to the fresh particles, ZrP impregnated onto CP exhibits a slight increase in sorption capacity, which may result from their nanosized particles after impregnation. More attractively, ZrP−001 displays much higher sorption preference toward lead ions over calcium ions than ZrP, D-001, and ZrP−CP. Such significant phenomena is mainly attributed to the Donnan membrane effect exerted by the immobilized sulfonate groups on D-001 and further validates its potential application for enhanced removal of the toxic metal from contaminated waters. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8016847