鸡蛋膜对水中铜离子的吸附作用

发布时间：2018-07-31 16:15

【摘要】：探究鸡蛋膜吸附剂对水中Cu~(2+)的吸附效果,利用二乙氨基二硫代甲酸钠萃取光度法测定溶液中的Cu~(2+)浓度,研究吸附剂粒径,pH,吸附剂用量,吸附温度和吸附时间与Cu~(2+)吸附量之间的关系。结果发现当吸附体系pH值为5,过60目筛鸡蛋膜吸附剂用量为15 g·L~(-1)时,吸附剂对水中Cu~(2+)达到最优吸附效果,吸附量为6.4 mg·g-1;其它共存离子(Pb~(2+),Cd~(2+),Zn~(2+))对Cu~(2+)的吸附影响较小。对等温吸附过程进行测定和模型拟合,发现Langmuir方程拟合效果好,判断鸡蛋膜对水中Cu~(2+)的吸附作用属于单分子层吸附。对吸附过程进行动力学模型拟合,发现Lagergren准二级动力学模型可以很好地描述鸡蛋膜对Cu~(2+)的吸附动力学行为。本研究结果可以为鸡蛋膜在生物传感器和吸附剂方面的应用提供参考。
[Abstract]:The adsorption effect of egg membrane adsorbent on Cu ~ (2) in water was investigated. The concentration of Cu ~ (2) in solution was determined by extraction spectrophotometry with sodium diethylaminodithiocarbamate, and the particle size of adsorbent, pH value and the amount of adsorbent were studied. The relationship between adsorption temperature, adsorption time and Cu2 adsorption capacity. The results showed that when the pH value of adsorption system was 5 and the amount of adsorbent of egg membrane was 15 g / L ~ (-1), the adsorption of Cu ~ (2) in water was optimized, the adsorption capacity was 6.4 mg 路g ~ (-1), and the effect of other co-existing ions (Pb ~ (2) ~ (2) CD ~ (2) ~ (2) Zn ~ (2) on the adsorption of Cu ~ (2) was less than that of other co-existing ions (Pb ~ (2) ~ (2) ~ (2) CD ~ (2) Zn ~ (2). The isothermal adsorption process was measured and the model fitting was carried out. It was found that the Langmuir equation fitted well, and the adsorption of Cu2 to water by egg membrane was determined to be monolayer adsorption. The kinetic model fitting the adsorption process shows that the Lagergren quasi-second-order kinetic model can well describe the adsorption kinetics of Cu2 on egg membrane. The results can provide reference for the application of egg membrane in biosensor and adsorbent.
【作者单位】：中国农业大学食品科学与营养工程学院;
【分类号】：O647.3;TS253.9

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