Removal of Ca(II) and Mg(II) from aqueous single metal solutions by mercerized cellulose and mercerized sugarcane bagasse grafted with EDTA dianhydride (EDTAD)

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作   者：

Osvaldo Karnitz Junior;  Leandro Vinicius Alves Gurgel;  Laurent Frederic Gil; 

作者机构：

35400-000 Ouro Freto;  Universidade Federal de Ouro Frew;  instituto de Ciencias Exatas e Biologicas;  Departamento de Quimica;  Minas Cerais;  Brazil; 

关键词：

Mercerization;  Modified sugarcane bagasse;  Adsorption;  Hardness water;  Ethylenediaminetetraacetic dianhydride; 

期刊名称：

Carbohydrate Polymers: Scientific and Technological Aspects of Industrially Important Polysaccharides

i s s n：

0144-8617

年卷期：

2010 年 79 卷 1 期

页   码：

184-191

页   码：

摘   要：

In a previous work, chemically modified cellulose (EMC) and sugarcane bagasse (EMMB) were prepared from mercerized cellulose (MC) and twice-mercerized sugarcane bagasse (MMB) using ethylenediamine-tetraacetic dianhydride (EDTAD) as modifying agent. In this work we described in detail the modification of these materials in function of reaction time and EDTAD amount in the reaction media. The resistance of ester bond at pH 1, 2,11, and 12 was also evaluated by FTIR. The results were used to model the hydrolysis process and a kinetic model was proposed. The modified materials (EMMB and EMC) were used to adsorb Ca~(2+) and Mg~(2+) ions from aqueous single solutions. The adsorption isotherms were developed at two pH values. These materials showed maximum adsorption capacities for Ca~(2+) and Mg~(2+) ions ranging from 15.6 to 54.1 mg/g and 13.5 to 42.6 mg/g, respectively. The modified material from sugarcane bagasse (EMMB) showed larger maximum adsorption capacities than modified material from cellulose (EMC) for both metals.