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Effective cr(VI) removal from simulated groundwater through the hydrotalcite-derived adsorbent / Yunfeng Xu in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2752–2758 Titre : Effective cr(VI) removal from simulated groundwater through the hydrotalcite-derived adsorbent Type de document : texte imprimé Auteurs : Yunfeng Xu, Auteur ; Jia Zhang, Auteur ; Guangren Qian, Auteur Année de publication : 2010 Article en page(s) : pp. 2752–2758 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Effective  Cr(VI;  Removal  from;  Groundwater;  Hydrotalcite Résumé : We investigated the feasibility of using calcined hydrotalcite (CHT) as the adsorbent of chromate to treat Cr(VI)-contaminated water through column tests under varied conditions. The column tests reveal that CHT can take up 34.3−44.7 mg(Cr)/g when the Cr(VI) concentration in the influent varies over a range of 50−200 mg/L (e.g., 0.96−3.85 mM) with pH 6−7 at 298 K. This uptake capacity is only reduced to 29.1 mg(Cr)/g when HCO3− (1.0 mM) and Cl− (1.0 mM) coexist in the influent. We note that the treated water is of high quality and is free of Cr(VI), with Mg and Al concentrations of <5−10 mg/L, and a pH of 6.5−7.0. The quick desorption of Cr(VI) from the adsorbent (CHT) has enabled us to recover Cr(VI) from the contaminated water and regenerate the adsorbent. All these findings promise CHT as an effective regenerable adsorbent for the remediation of Cr(VI)-contaminated groundwater. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901469c [article] Effective cr(VI) removal from simulated groundwater through the hydrotalcite-derived adsorbent [texte imprimé] / Yunfeng Xu, Auteur ; Jia Zhang, Auteur ; Guangren Qian, Auteur . - 2010 . - pp. 2752–2758. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2752–2758 Mots-clés : Effective  Cr(VI;  Removal  from;  Groundwater;  Hydrotalcite Résumé : We investigated the feasibility of using calcined hydrotalcite (CHT) as the adsorbent of chromate to treat Cr(VI)-contaminated water through column tests under varied conditions. The column tests reveal that CHT can take up 34.3−44.7 mg(Cr)/g when the Cr(VI) concentration in the influent varies over a range of 50−200 mg/L (e.g., 0.96−3.85 mM) with pH 6−7 at 298 K. This uptake capacity is only reduced to 29.1 mg(Cr)/g when HCO3− (1.0 mM) and Cl− (1.0 mM) coexist in the influent. We note that the treated water is of high quality and is free of Cr(VI), with Mg and Al concentrations of <5−10 mg/L, and a pH of 6.5−7.0. The quick desorption of Cr(VI) from the adsorbent (CHT) has enabled us to recover Cr(VI) from the contaminated water and regenerate the adsorbent. All these findings promise CHT as an effective regenerable adsorbent for the remediation of Cr(VI)-contaminated groundwater. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901469c