State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
Bioresour Technol. 2011 Feb;102(3):2821-8. doi: 10.1016/j.biortech.2010.10.038. Epub 2010 Oct 14.
A new biosorbent -Sargassum sp. encapsulated with epichlorohydrin (ECH) cross-linked chitosan (CS) was investigated for nickel ions removal. The prepared biosorbent with Sargassum sp. to cross-linked chitosan of 3 (weight ratio) had the highest sorption capacity. The biosorption kinetics can be well fitted by the diffusion-controlled model. The organic leaching of CS was 77-88% less than that of algae at different pH. The biosorption capacity of nickel on CS was much higher than that of cross-linked chitosan (CLC) bead and lower than that of raw algae due to encapsulation. In addition, the reusability of CS was further evaluated and confirmed through five adsorption-desorption cycles. Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the nickel ions sequestration mechanism included ion exchange and nickel complexation with the carboxyl, amino, alcoholic and ether groups in CS.
一种新型的生物吸附剂——用环氧氯丙烷（ECH）交联壳聚糖（CS）包封的马尾藻被研究用于去除镍离子。用 3（重量比）的马尾藻和交联壳聚糖制备的生物吸附剂具有最高的吸附容量。吸附动力学可以很好地拟合扩散控制模型。在不同的 pH 值下，CS 的有机浸出率比藻类低 77-88%。由于封装，镍在 CS 上的吸附容量远高于交联壳聚糖（CLC）珠和原始藻类。此外，通过五个吸附-解吸循环进一步评估和证实了 CS 的可重复使用性。傅里叶变换红外光谱（FT-IR）和 X 射线光电子能谱（XPS）分析表明，镍离子的螯合机制包括离子交换和镍与 CS 中的羧基、氨基、醇基和醚基的配位络合。
