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Evaluation of the capacity of hydroxyapaptite prepared from concrete sludge to remove lead from water / Takeshi Sasaki in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9564-9568 Titre : Evaluation of the capacity of hydroxyapaptite prepared from concrete sludge to remove lead from water Type de document : texte imprimé Auteurs : Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Atsushi Iizuka, Auteur Année de publication : 2011 Article en page(s) : pp. 9564-9568 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydroxyapaptite Résumé : Low-crystallinity hydroxyapatite (HAP) was prepared from concrete sludge as a recycling method for concrete waste. The HAP was prepared from model samples of concrete sludge and phosphorus wastewater, and its capacity to remove lead from water was investigated. Lead ions were quickly removed by the HAP particles. Some of the prepared HAP samples reduced the lead concentration of the water to within the Japanese standard for industrial effluent (0.1 ppm). The lead removal capacity of the concrete sludge-derived HAP (506 mg/g) was comparable to that of reagent grade HAP. Lead in water was removed in the form of Pb3(CO3)2(OH)2. These results indicate that HAP prepared from concrete sludge can be applied to removal of lead ions from water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200233s [article] Evaluation of the capacity of hydroxyapaptite prepared from concrete sludge to remove lead from water [texte imprimé] / Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Atsushi Iizuka, Auteur . - 2011 . - pp. 9564-9568. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9564-9568 Mots-clés : Hydroxyapaptite Résumé : Low-crystallinity hydroxyapatite (HAP) was prepared from concrete sludge as a recycling method for concrete waste. The HAP was prepared from model samples of concrete sludge and phosphorus wastewater, and its capacity to remove lead from water was investigated. Lead ions were quickly removed by the HAP particles. Some of the prepared HAP samples reduced the lead concentration of the water to within the Japanese standard for industrial effluent (0.1 ppm). The lead removal capacity of the concrete sludge-derived HAP (506 mg/g) was comparable to that of reagent grade HAP. Lead in water was removed in the form of Pb3(CO3)2(OH)2. These results indicate that HAP prepared from concrete sludge can be applied to removal of lead ions from water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200233s

Phosphorus adsorbent derived from concrete sludge (PAdeCS) and its phosphorus recovery performance / Atsushi Iizuka in Industrial & engineering chemistry research, Vol. 51 N° 34 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11266-11273 Titre : Phosphorus adsorbent derived from concrete sludge (PAdeCS) and its phosphorus recovery performance Type de document : texte imprimé Auteurs : Atsushi Iizuka, Auteur ; Takeshi Sasaki, Auteur ; Teruhisa Hongo, Auteur Année de publication : 2012 Article en page(s) : pp. 11266-11273 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorbents  phosphorus Résumé : Solid adsorbents for phosphorus recovery (PAdeCS) were prepared from real concrete sludge sampled from an industrial site that produces concrete poles and piles. The concrete sludge was diluted with water at dilution ratios from 1 to 15 to prevent hardening of the cement components. The diluted concrete sludge was then filtered, dried, and used as a solid adsorbent. Two drying methods were examined: natural drying under atmospheric conditions and forced drying in an oven at 105 °C. The phosphorus recovery performances of prepared adsorbents were examined using a potassium dihydrogen phosphate (KH2PO4) solution containing 100 mg-P/L (close to the effluent produced by the sewage sludge dewatering process) as a synthetic for wastewater. All the prepared adsorbents were able to recover phosphorus. Using the forced drying treatment during adsorbent preparation greatly improved the rate of phosphorus recovery from solution. The adsorbent prepared with dilution ratio 10 and forced drying exhibited the highest phosphorus recovery performance. The final phosphorus concentration in solution was 0.83 mg/L, 4 h after addition of the optimized adsorbent, which is extremely promising for application in inexpensive phosphorus recovery processes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301225g [article] Phosphorus adsorbent derived from concrete sludge (PAdeCS) and its phosphorus recovery performance [texte imprimé] / Atsushi Iizuka, Auteur ; Takeshi Sasaki, Auteur ; Teruhisa Hongo, Auteur . - 2012 . - pp. 11266-11273. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11266-11273 Mots-clés : Adsorbents  phosphorus Résumé : Solid adsorbents for phosphorus recovery (PAdeCS) were prepared from real concrete sludge sampled from an industrial site that produces concrete poles and piles. The concrete sludge was diluted with water at dilution ratios from 1 to 15 to prevent hardening of the cement components. The diluted concrete sludge was then filtered, dried, and used as a solid adsorbent. Two drying methods were examined: natural drying under atmospheric conditions and forced drying in an oven at 105 °C. The phosphorus recovery performances of prepared adsorbents were examined using a potassium dihydrogen phosphate (KH2PO4) solution containing 100 mg-P/L (close to the effluent produced by the sewage sludge dewatering process) as a synthetic for wastewater. All the prepared adsorbents were able to recover phosphorus. Using the forced drying treatment during adsorbent preparation greatly improved the rate of phosphorus recovery from solution. The adsorbent prepared with dilution ratio 10 and forced drying exhibited the highest phosphorus recovery performance. The final phosphorus concentration in solution was 0.83 mg/L, 4 h after addition of the optimized adsorbent, which is extremely promising for application in inexpensive phosphorus recovery processes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301225g

Preparation of a solid adsorbent derived from concrete sludge and its boron removal performance / Takeshi Sasaki in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5813–5817 Titre : Preparation of a solid adsorbent derived from concrete sludge and its boron removal performance Type de document : texte imprimé Auteurs : Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Teruhisa Hongo, Auteur Année de publication : 2012 Article en page(s) : pp. 5813–5817 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorbent  Concrete  sludge Résumé : We prepared a solid adsorbent for boron removal using real concrete sludge. The sludge was diluted with water at dilution ratios from 1 to 15. The diluted concrete sludge was then filtered and dried. Two types of drying methods were examined: natural drying under atmospheric conditions and forced drying in an oven at 105 °C. The boron removal performance was examined using a boric acid solution containing 100 mgB/L. All of the adsorbents prepared showed boron removal capacity. The adsorbent prepared with dilution ratio 10 and forced drying exhibited the highest boron removal capacity; the boron concentration after 24 h was just 3.33 mg/L, which is below the Japanese standard for industrial effluent (10 mg/L), and the maximum adsorption capacity for boron was 50 mgboron/gadsorbent. The drying method had a significant effect on both the rate and capacity of boron removal. With natural drying under atmospheric conditions, the adsorption initially proceeded quickly, but the final amount adsorbed was lower than that for the force-dried adsorbents. The boron removal can be attributed to ion exchange and uptake of boron in the ettringite phase. These results indicate that boron adsorbents prepared from concrete sludge can be applied for the removal of boron from effluents. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024646 [article] Preparation of a solid adsorbent derived from concrete sludge and its boron removal performance [texte imprimé] / Takeshi Sasaki, Auteur ; Yuka Sakai, Auteur ; Teruhisa Hongo, Auteur . - 2012 . - pp. 5813–5817. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5813–5817 Mots-clés : Adsorbent  Concrete  sludge Résumé : We prepared a solid adsorbent for boron removal using real concrete sludge. The sludge was diluted with water at dilution ratios from 1 to 15. The diluted concrete sludge was then filtered and dried. Two types of drying methods were examined: natural drying under atmospheric conditions and forced drying in an oven at 105 °C. The boron removal performance was examined using a boric acid solution containing 100 mgB/L. All of the adsorbents prepared showed boron removal capacity. The adsorbent prepared with dilution ratio 10 and forced drying exhibited the highest boron removal capacity; the boron concentration after 24 h was just 3.33 mg/L, which is below the Japanese standard for industrial effluent (10 mg/L), and the maximum adsorption capacity for boron was 50 mgboron/gadsorbent. The drying method had a significant effect on both the rate and capacity of boron removal. With natural drying under atmospheric conditions, the adsorption initially proceeded quickly, but the final amount adsorbed was lower than that for the force-dried adsorbents. The boron removal can be attributed to ion exchange and uptake of boron in the ettringite phase. These results indicate that boron adsorbents prepared from concrete sludge can be applied for the removal of boron from effluents. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024646