硅掺杂二氧化钛交联壳聚糖的合成及对水中Cu²⁺的吸附研究

Preparation of Si Doped TiO₂ Cross-Linked Chitosan and Its Adsorption of Cu²⁺ from Aqueous Solution

摘要: 将壳聚糖与硅掺杂二氧化钛进行共混，在弱碱性条件下加入戊二醛制的硅掺杂二氧化钛交联壳聚糖。用红外光谱(FTIR)对硅掺杂二氧化钛交联壳聚糖进行表征，研究了pH值、Cu²⁺初始浓度、吸附剂投加量对Cu²⁺吸附的影响，并利用Langmuir和Freundilich模型对等温吸附进行拟合。实验结果表明最佳吸附pH = 5，对Cu²⁺浓度50 mg/L的水溶液在30℃下最大Cu²⁺去除率可达96.5%；吸附符合Langmuir和Freundlich模型，最大吸附量为119.05 mg/g。

Abstract:

In the condition of alkalescence, the Si doped TiO₂ cross-linked chitosan was prepared by mixing glutaraldehyde, silicon doped titanium dioxide and cross-linking chitosan. Infared spectra of chitosan before and after modification shows that silicon doped titanium dioxide is mingled successfully into chitosan. The effect of pH value, initial concentration of Cu²⁺ and the amount of adsorbent on the absorption efficiency were studied. The absorption isotherm was described by the models of both Langmuir and Freundilich equations. The results indicated that the removal rate of Cu²⁺ is 96.5% in initial concentration of 50mg/L when pH value is equal to 5 at the temperature of 30˚C. The adsorption isotherms were well fitted by the models of Langmuir and Freundilich equations and the maximum adsorption capacity is 119.05 mg/g.