Application of a new bifunctionalized chitosan derivative with zwitterionic characteristics for the adsorption of Cu2+, Co2+, Ni2+, and oxyanions of Cr6+ from aqueous solutions: Kinetic and equilibrium aspects

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:466

Article

Rezende de Almeida, Francine Tatiane¹  Silva Ferreira, Bruno Christiano^3,4  da Silva Lage Moreira, Ana Luisa¹  de Freitas, Rossimiriam Pereira³  Gil, Laurent Frederic¹  Alves Gurgel, Leandro Vinicius² 

[1] Univ Fed Ouro Preto, Inst Biol & Exact Sci, Dept Chem, Grp Organ & Environm Chem GOEQ, Campus Univ Morro Cruzeiro S-N, BR-35400000 Ouro Preto, MG, Brazil

[2] Univ Fed Ouro Preto, Inst Biol & Exact Sci, Dept Chem, GPOC, Campus Univ Morro Cruzeiro S-N', BR-35400000 Ouro Preto, MG, Brazil

[3] Univ Fed Minas Gerais, Dept Chem, Inst Exact Sci ICEX, Ave Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil

[4] Pontificia Univ Catolica Minas Gerais, ICEI, Dept Quim & Fis, Ave Dom Jose Gaspar 500, BR-30535901 Belo Horizonte, MG, Brazil

关键词: Bifunctionalized chitosan;    Adsorption;    Copper;    Cobalt;    Nickel;    Chromium;    Desorption;   

DOI  :  10.1016/j.jcis.2015.12.037

来源: Elsevier

【 摘 要 】

This study describes the synthesis of a new chitosan derivative (C2) with zwitterionic characteristics and its use for the removal of cationic species Cu2+, Co2+, and Ni2+ and anionic species of Cr6+ in a single aqueous solution. The new adsorbent was synthesized by quaternization of the amine group of chitosan and esterification of hydroxyl groups with EDTA dianhydride. These combined reactions gave both cationic and anionic characteristics to C2 with the release of quaternary ammonium groups and carboxylic groups. The capacity of C2 to adsorb Cu2+, Co2+, Ni2+, and oxyanions of Cr6+ was evaluated in a batch process with different contact times, pH values, and initial concentrations. Adsorption isotherms were best fitted to the Langmuir and Sips models. The maximum adsorption capacities (Q(max)) of C2 for adsorption of Cu-2+(,) Co2+, Ni2+, and Cr6+ were 0.698, 1.125, 0.725, and 1.910 mmol/g, respectively. The Delta(ads)G degrees values were in the range from -20 to -28 kJ/mol. These values suggest a mixed mechanism controlling adsorption. Desorption studies using an aqueous solution consisting of 0.1 mol/L. HNO3 were carried out. The reusability of the recovered C2 adsorbent after desorption was also evaluated. (C) 2015 Elsevier Inc. All rights reserved.

【 授权许可】

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