Group of Organic and Environmental Chemistry (GOEQ), Department of Chemistry, Institute of Biological and Exact Sciences, Federal University of Ouro Preto, Campus Morro do Cruzeiro, s/n°, Bauxita, 35400-000, Ouro Preto, Minas Gerais, Brazil.
Group of Physical Organic Chemistry (GPOC), Department of Chemistry, Institute of Biological and Exact Sciences, Federal University of Ouro Preto, Campus Morro do Cruzeiro, s/n°, Bauxita, 35400-000, Ouro Preto, Minas Gerais, Brazil.
J Hazard Mater. 2022 Feb 15;424(Pt B):127401. doi: 10.1016/j.jhazmat.2021.127401. Epub 2021 Oct 6.
This study describes the synthesis of a new bioadsorbent with zwitterionic characteristics and its successful application for removal of a cationic dye (crystal violet, CV) and an anionic dye (orange II, OII) from single component aqueous systems. The new bi-functionalized cellulose derivative (MC3) was produced by chemical modification of cellulose with succinic anhydride and choline chloride to introduce carboxylic and quaternary ammonium functional groups on the cellulose surface. MC3 was characterized by several wet chemical and spectroscopic methods. The effects of solution pH, contact time, and initial solute concentration on removal of CV and OII by MC3 were investigated. Studies of the desorption and re-adsorption of the dyes were also carried out. The isotherms for adsorption of CV and OII on MC3 were satisfactorily fitted using the Konda and Langmuir models. MC3 showed experimental maximum adsorption capacities of 2403 mg g for CV and 201 mg g for OII. The desorption and re-adsorption results showed that MC3 could be reused in successive adsorption cycles, which is essential for minimizing process costs and waste generation. The findings showed that MC3 is a versatile biosorbent capable of efficiently removing both cationic and anionic dyes.
本研究描述了一种具有两性离子特性的新型生物吸附剂的合成及其在从单一成分水体系中去除阳离子染料（结晶紫，CV）和阴离子染料（橙色 II，OII）中的成功应用。新型双官能化纤维素衍生物（MC3）通过用琥珀酸酐和氯化胆碱对纤维素进行化学修饰来制备，在纤维素表面上引入羧酸和季铵官能团。MC3 通过多种湿化学和光谱方法进行了表征。考察了溶液 pH 值、接触时间和初始溶质浓度对 MC3 去除 CV 和 OII 的影响。还进行了染料的解吸和再吸附研究。CV 和 OII 在 MC3 上的吸附等温线用 Konda 和 Langmuir 模型进行了满意的拟合。MC3 对 CV 的实验最大吸附容量为 2403mg/g，对 OII 的实验最大吸附容量为 201mg/g。解吸和再吸附结果表明，MC3 可在连续的吸附循环中重复使用，这对于降低工艺成本和减少废物产生至关重要。研究结果表明，MC3 是一种多功能的生物吸附剂，能够有效去除阳离子和阴离子染料。
