鱿鱼骨制备的 N-(2-羧乙基)壳聚糖的羧乙基化程度对其吸附 Cu(II)性能的影响。
Effect of carboxyethylation degree on the adsorption capacity of Cu(II) by N-(2-carboxyethyl)chitosan from squid pens.
机构信息
Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China.
出版信息
Carbohydr Polym. 2016 Mar 15;138:301-8. doi: 10.1016/j.carbpol.2015.11.037. Epub 2015 Nov 19.
Chitosan was prepared by N-deacetylation of squid pens β-chitin, and N-carboxyethylated chitosan (N-CECS) with different degrees of substitution (DS) were synthesized. DS values of N-CECS derivatives calculated by (1)H nuclear magnetic resonance (NMR) spectroscopy were 0.60, 1.02 and 1.46, respectively. The adsorption capacity of Cu(II) by N-CECS correlated well with the DS and pH ranging from 3.2 to 5.8. The maximum Cu(II) adsorption capacity (qm) of all three N-CECS at pH 5.4 was 207.5mg g(-1), which was 1.4-fold higher than that of chitosan. The adsorption equilibrium process was better described by the Langmuir than Freundlich isotherm model. Adsorption of Cu(II) ion onto N-CECS followed a pseudo-second order mechanism with chemisorption as the rate-limiting step. In a ternary adsorption system, the adsorption capacity of Cu(II) by N-CECS also presented high values, and qm for Cu(II), Cd(II), and Pb(II) were 150.2, 28.8, and 187.9mg g(-1), respectively.
壳聚糖是通过鱿鱼笔β-壳聚糖的 N-去乙酰化制备的，并且合成了具有不同取代度（DS）的 N-羧乙基壳聚糖（N-CECS）。通过（1）H 核磁共振（NMR）光谱计算出 N-CECS 衍生物的 DS 值分别为 0.60、1.02 和 1.46。N-CECS 对 Cu（II）的吸附容量与 DS 和 pH 值（3.2 至 5.8）密切相关。在所有三种 N-CECS 的 pH 值为 5.4 时，Cu（II）的最大吸附容量（qm）为 207.5mg g（-1），是壳聚糖的 1.4 倍。吸附平衡过程更符合 Langmuir 而不是 Freundlich 等温线模型。Cu（II）离子吸附到 N-CECS 上遵循拟二级动力学，其中化学吸附是限速步骤。在三元吸附体系中，N-CECS 对 Cu（II）的吸附容量也呈现出较高的值，Cu（II）、Cd（II）和 Pb（II）的 qm 值分别为 150.2、28.8 和 187.9mg g（-1）。
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