Synthesis and application of a new carboxylated cellulose derivative. Part I: Removal of Co2+, Cu2+ and Ni2+ from monocomponent spiked aqueous solution

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:483

Article

Teodoro, Filipe Simoes¹  do Carmo Ramos, Stela Nhandeyara¹  Cota Elias, Megg Madonyk¹  Mageste, Aparecida Barbosa¹  Dias Ferreira, Gabriel Max²  Mendes da Silva, Luis Henrique²  Gil, Laurent Frederic¹  Alves Gurgel, Leandro Vinicius¹ 

[1] Univ Fed Ouro Preto, Grp Fis Quim Organ, Dept Quim, Campus Univ Morro Cruzeiro S-N, BR-35400000 Ouro Preto, MG, Brazil

[2] Univ Fed Vicosa, Grp Quim Verde Coloidal & Macromol, Dept Quim, Ctr Ciencias Exatas, Ave PH Rolfs S-N, BR-36570000 Vicosa, MG, Brazil

关键词: Carboxylated cellulose;    1,2,4-Benzenetricarboxylic anhydride;    Adsorption;    Desorption;    Isothermal titration calorimetry;    Thermodynamics;   

DOI  :  10.1016/j.jcis.2016.08.004

来源: Elsevier

【 摘 要 】

A new carboxylated cellulose derivative (CTA) was prepared from the esterification of cellulose with 1,2, 4-Benzenetricarboxylic anhydride. CTA was characterized by percent weight gain (pwg), amount of carboxylic acid groups (n(COOH)), elemental analysis, FTIR, TGA, solid-state C-13 NMR, X-ray diffraction (DRX), specific surface area, pore size distribution, SEM and EDX. The best CTA synthesis condition yielded a pwg and n(COOH) of 94.5% and 6.81 mmol g(-1), respectively. CTA was used as an adsorbent material to remove Co2+, Cu2+ and Ni2+ from monocomponent spiked aqueous solution. Adsorption studies were developed as a function of the solution pH, contact time and initial adsorbate concentration. Langmuir model better fitted the experimental adsorption data and the maximum adsorption capacities estimated by this model were 0.749, 1.487 and 1.001 mmol g(-1) for Co2+, Cu2+ and Ni2+, respectively. The adsorption mechanism was investigated by using isothermal titration calorimetry. The values of Delta H-ads degrees were in the range from 5.36 to 8.09 kJ mol(-1), suggesting that the mechanism controlling the phenomenon is physisorption. Desorption and re-adsorption studies were also performed. Desorption and re-adsorption efficiencies were closer to 100%, allowing the recovery of both metal ions and CTA adsorbent. (C) 2016 Elsevier Inc. All rights reserved.

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