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Double - hydrophilic block copolymers as precipitation inhibitors for calcium phosphate and iron(III) / Fu Change in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8920–8926 Titre : Double - hydrophilic block copolymers as precipitation inhibitors for calcium phosphate and iron(III) Type de document : texte imprimé Auteurs : Fu Change, Auteur ; Zhou Yuming, Auteur ; Xie Hongtao, Auteur Année de publication : 2010 Article en page(s) : pp. 8920–8926 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrophilic  Copolymers  Anhydride Résumé : Novel double-hydrophilic block copolymers, maleic anhydride (MA)−allylpolyethoxy carboxylate (APEC) and maleic anhydride (MA)−ammonium allylpolyethoxy sulfate (APES), were specially designed and synthesized from allyloxy polyethoxy ether (APEO) to inhibit the precipitation of calcium phosphate and iron (III). Structures of APEO, APEC, MA−APEC, APES, and MA−APES were characterized by FT-IR. The study shows that both MA−APEC and MA−APES have significant ability to inhibit the precipitation of calcium phosphate at the dosage of 6 mg/L, approximately showing 99 and 90% inhibition, respectively. The data of the light transmittance of ferrous solutions show that, compared to MA−APES, MA−APEC has superior ability to stabilize iron (III) in solutions. The light transmittance of ferrous solutions is about 23% in the presence of MA−APEC when the dosage is 6 mg/L, whereas in the presence of MA−APES, it is about 31% at a dosage of 12 mg/L. Scanning electron microscopy (SEM) shows that the copolymers influence the morphology of calcium phosphate crystallites. Transmission electron microscopy (TEM) indicates the excellent inhibition results from the formation of core−shell structure. Double-hydrophilic block copolymers of MA−APEC and MA−APES have also been proven to be effective inhibitors of calcium phosphate and iron (III) even at elevated solution temperature, pH, and Ca2+ and Fe2+ concentration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100395z#afn1 [article] Double - hydrophilic block copolymers as precipitation inhibitors for calcium phosphate and iron(III) [texte imprimé] / Fu Change, Auteur ; Zhou Yuming, Auteur ; Xie Hongtao, Auteur . - 2010 . - pp. 8920–8926. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8920–8926 Mots-clés : Hydrophilic  Copolymers  Anhydride Résumé : Novel double-hydrophilic block copolymers, maleic anhydride (MA)−allylpolyethoxy carboxylate (APEC) and maleic anhydride (MA)−ammonium allylpolyethoxy sulfate (APES), were specially designed and synthesized from allyloxy polyethoxy ether (APEO) to inhibit the precipitation of calcium phosphate and iron (III). Structures of APEO, APEC, MA−APEC, APES, and MA−APES were characterized by FT-IR. The study shows that both MA−APEC and MA−APES have significant ability to inhibit the precipitation of calcium phosphate at the dosage of 6 mg/L, approximately showing 99 and 90% inhibition, respectively. The data of the light transmittance of ferrous solutions show that, compared to MA−APES, MA−APEC has superior ability to stabilize iron (III) in solutions. The light transmittance of ferrous solutions is about 23% in the presence of MA−APEC when the dosage is 6 mg/L, whereas in the presence of MA−APES, it is about 31% at a dosage of 12 mg/L. Scanning electron microscopy (SEM) shows that the copolymers influence the morphology of calcium phosphate crystallites. Transmission electron microscopy (TEM) indicates the excellent inhibition results from the formation of core−shell structure. Double-hydrophilic block copolymers of MA−APEC and MA−APES have also been proven to be effective inhibitors of calcium phosphate and iron (III) even at elevated solution temperature, pH, and Ca2+ and Fe2+ concentration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100395z#afn1

Inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation for industrial recycling water / Fu Change in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10393–10399 Titre : Inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation for industrial recycling water Type de document : texte imprimé Auteurs : Fu Change, Auteur ; Zhou Yuming, Auteur ; Liu Guangqing, Auteur Année de publication : 2011 Article en page(s) : pp. 10393–10399 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Industrial  recycling  water Résumé : In an attempt to control Ca3(PO4)2, CaCO3, and CaSO4 deposits in industrial recycling water systems, an acrylic acid (AA)–allylpolyethoxy carboxylate (APEC) copolymer was examined as a nonphosphorus inhibitor. The synthesized AA–APEC copolymer was characterized by FT-IR. The performance of AA–APEC on inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation was compared with that of current commercial inhibitors. It was shown that AA–APEC exhibited excellent ability to control inorganic minerals, with approximately 82.88% CaSO4 inhibition and 99.89% Ca3(PO4)2 inhibition at levels of 3 and 6 mg/L AA–APEC, respectively. AA–APEC also displayed ability to prevent the formation of CaCO3 scales. Transmission electron microscopy (TEM) images indicated that the outstanding performance of AA–APEC on Ca3(PO4)2 inhibition resulted from a decrease in size of Ca3(PO4)2 solid particles thereby dispersing these particles throughout a fluid, while CaCO3 inhibition was attributed to the formation of ribbon-shaped structures and CaSO4 inhibition resulted from loose CaSO4 crystallites speculated on scanning electron microscopy (SEM) images. The proposed inhibition mechanism suggests the formation of complexes between the side-chain carboxyl groups of AA–APEC and calcium ions on the surface of inorganic minerals, and the excellent solubility of complexes resulted from a number of hydrophilic polyethylene glycol (PEG) segments. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200051r [article] Inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation for industrial recycling water [texte imprimé] / Fu Change, Auteur ; Zhou Yuming, Auteur ; Liu Guangqing, Auteur . - 2011 . - pp. 10393–10399. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10393–10399 Mots-clés : Industrial  recycling  water Résumé : In an attempt to control Ca3(PO4)2, CaCO3, and CaSO4 deposits in industrial recycling water systems, an acrylic acid (AA)–allylpolyethoxy carboxylate (APEC) copolymer was examined as a nonphosphorus inhibitor. The synthesized AA–APEC copolymer was characterized by FT-IR. The performance of AA–APEC on inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation was compared with that of current commercial inhibitors. It was shown that AA–APEC exhibited excellent ability to control inorganic minerals, with approximately 82.88% CaSO4 inhibition and 99.89% Ca3(PO4)2 inhibition at levels of 3 and 6 mg/L AA–APEC, respectively. AA–APEC also displayed ability to prevent the formation of CaCO3 scales. Transmission electron microscopy (TEM) images indicated that the outstanding performance of AA–APEC on Ca3(PO4)2 inhibition resulted from a decrease in size of Ca3(PO4)2 solid particles thereby dispersing these particles throughout a fluid, while CaCO3 inhibition was attributed to the formation of ribbon-shaped structures and CaSO4 inhibition resulted from loose CaSO4 crystallites speculated on scanning electron microscopy (SEM) images. The proposed inhibition mechanism suggests the formation of complexes between the side-chain carboxyl groups of AA–APEC and calcium ions on the surface of inorganic minerals, and the excellent solubility of complexes resulted from a number of hydrophilic polyethylene glycol (PEG) segments. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200051r