摘要
引言壳聚糖(CTS)是由甲壳素经脱乙酰基化反应而得到的一种天然高分子聚合物,由于具有独特的分子结构,良好的理化性能、药理作用及可降解和多种生物活性,其本身可用作医药保健品和药用辅料等,它还可借其结构中的羟基和氨基与金属离子配位形成有机金属配合物.但由于壳聚糖大分子的影响,使其配位基与金属离子的配位受到一定的空间阻碍.人们根据壳聚糖分子中同时存在羟基和氨基的结构特点,对其进行化学改性,既改善了其理化特性,又提高了配位能力.锌是人体所必需的基本元素㈨,研究壳聚糖衍生物与锌的吸附行为,合成具有活性的壳聚糖衍生物锌,在工业、农业、医药等方面有着十分重要的理论和实际应用价值.
An adsorption system was used to study the adsorption of Zn( Ⅱ ) ion from chitosan derivatives, chitosan a-ketoglutaric acid (KCTS) and hydroxamated chitosan α-ketoglutaric acid (HKCTS). Experiments were carried out to study the effects of pH and concentranon of Zn( Ⅱ ) ion. It was found that the bonding between Zn( Ⅱ) and chitosan derivatives was in accordance with the Langmuir isotherm. The kinetic experimental data correlated well with the second-order kinetic model, indicating that the chemical sorption was the rate-limiting step. The apparent activation energy value of adsorption were 25.47 kJ · mol^-1 and 5. 473 kJ ·mol^-1 for KCTS and HKCTS respectively, and the sorption rate constant of Lagergren second-order sorption were 0. 00311 g·mg^-1· min^-1 and 0. 005 g·mg^-1 ·min^-1 at 293 K, respectively.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第11期2652-2656,共5页
CIESC Journal
基金
国家自然科学基金项目(20376085).~~