Optimization of cellulose and sugarcane bagasse oxidation: Application for adsorptive removal of crystal violet and auramine-O from aqueous solution

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:494

Article

Martins, Luide Rodrigo¹  Vieira Rodrigues, Josilene Aparecida¹  Herrera Adarme, Oscar Fernando¹  Sacramento Melo, Tania Marcia¹  Alves Gurgel, Leandro Vinicius¹  Gil, Laurent Frederic¹ 

[1] Univ Fed Ouro Preto, Dept Quim, Inst Ciencias Exatas & Biol, Campus Univ Morro do Cruzeiro S-N, BR-35400000 Ouro Preto, MG, Brazil

关键词: Oxidized cellulose;    Oxidized sugarcane bagasse;    Adsorption;    Desorption;    Crystal violet;    Auramine-O;   

DOI  :  10.1016/j.jcis.2017.01.085

来源: Elsevier

【 摘 要 】

Cellulose (Cel) and sugarcane bagasse (SB) were oxidized with an H3PO4-NaNO2 mixture to obtain adsorbent materials with high contents of carboxylic groups. The oxidation reactions of Cel and SB were optimized using design of experiments (DOE) and response surface methodology (RSM). The optimized synthesis conditions yielded Cox and SBox with 4.8 mmol/g and 4.5 mmol/g of carboxylic acid groups, respectively. Cox and SBox were characterized by FTIR, TGA, PZC and solid-state C-13 NMR. The adsorption of the model cationic dyes crystal violet (CV) and auramine- O (AO) on Cox and SBox in aqueous solution was investigated as a function of the solution pH, the contact time and the initial dye concentration. The adsorption of CV and AO on Cox was described by the Elovich equation and the pseudo-first-order kinetic model respectively, while the adsorption of CV and AO on SBox was described by the pseudo-second order kinetic model. Adsorption isotherms were well fitted by the Langmuir and Konda models, with maximum adsorption capacities (Q(max)) of 1117.8 mg/g of CV and 1223.3 mg/g of AO on Cox and 1018.2 mg/g of CV and 682.8 mg/g of AO on SBox. Desorption efficiencies were in the range of 50-52% and re-adsorption capacities varied from 65 to 81%, showing the possibility of reuse of both adsorbent materials. (C) 2017 Elsevier Inc. All rights reserved.

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