Effect of pH on competitive adsorption of Cu(II), Ni(II), and Zn(II) from water onto chitosan beads
Effect of pH on competitive adsorption of Cu(II), Ni(II), and Zn(II) from water onto chitosan beads
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DOI：
10.1023/a:1015222607996
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发表时间：
2002-01-01
影响因子：
3.3
通讯作者：
Shao, HJ
中科院分区：
文献类型：
--
作者：
Juang, RS;Shao, HJ
测定了戊二醛交联壳聚糖微球对Cu ~（2+）、Ni ~（2+）和Zn ~（2+）的吸附量。珠粒的平均粒度和孔体积分别为2 mm和0.06cm（3）/g，BET表面积为60 m2/g。所有实验均在298 K下进行，作为水相中初始pH（2.0-5.0）、总金属浓度（0.77-17.0 mol/m（3））和摩尔浓度比（0.25-4）的函数。结果表明，金属吸附量一般随溶液pH值的增加而增加。当Cu 2+存在时，二元和三元体系中的竞争吸附显著。Cu-Ni和Cu-Zn二元体系的选择性因子分别在平衡pH 5.1-5.3和4.5-4.9范围内达到最大值。这种吸附剂提供了一种可能性，从这样的多组分溶液中选择性分离Cu 2+。
The amounts of adsorption of Cu2+, Ni2+, and Zn2+ from single, binary, and tertiary nitrate solutions onto glutaraldehyde cross-linked chitosan beads were measured. The beads had an average particle size and pore volume of 2 mm and 0.06 cm(3)/g, respectively, and had a BET surface area of 60 m(2)/g. All experiments were performed at 298 K as a function of initial pH (2.0-5.0), total metal concentration (0.77-17.0 mol/m(3)), and molar concentration ratio (0.25-4) in the aqueous phase. It was shown that the amount of metal adsorption generally increased with increasing solution pH. Competitive adsorption was significant in binary and tertiary systems when Cu2+ was present. The selectivity factor reached maximum in an equilibrium pH range of 5.1-5.3 and 4.5-4.9 for the Cu-Ni and Cu-Zn binary systems, respectively. This adsorbent provided a possibility for selective separation of Cu2+ from such multi-component solutions.