ADSORPTION OF METAL-IONS ON CHITOSAN AND CROSS-LINKED COPPER(II)-COMPLEXED CHITOSAN
ADSORPTION OF METAL-IONS ON CHITOSAN AND CROSS-LINKED COPPER(II)-COMPLEXED CHITOSAN
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DOI：
10.1246/bcsj.66.2915
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发表时间：
1993-10-01
影响因子：
4
通讯作者：
YOSHIZUKA, K
中科院分区：
文献类型：
--
作者：
INOUE, K;BABA, Y;YOSHIZUKA, K
通过批量考察pH、硝酸铵和盐酸浓度、初始金属浓度等因素对壳聚糖吸附硝酸铵和盐酸水溶液中金属离子的影响，研究了壳聚糖对硝酸铵和盐酸水溶液中金属离子的吸附行为。为了防止壳聚糖在酸性水溶液中的溶解损失，制备了交联铜（II）络合壳聚糖，并将其吸附性能与原壳聚糖进行了比较。在硝酸铵溶液中，交联不仅降低了金属离子的吸附量，而且降低了氢离子的吸附量。然而，与其他二价金属离子相比，铜（II）的下降幅度最小：氧化钒（II）、锌（II）、镍（II）和钴（II）。这可能是由于交联过程中铜（II）离子的“模板”效应，保护壳聚糖的活性吸附位点不受交联试剂的攻击。结果表明，壳聚糖具有优良的负载能力和选择性，远高于市售的亚氨基二乙酸型螯合树脂。对其优异的吸附性能进行了定性讨论。与在硝酸铵水溶液中吸附钯（II）和铂（IV）的情况相反，交联铜-(II)络合壳聚糖与原壳聚糖在盐酸中吸附钯（II）和铂（IV）的分布比没有显著降低。
A fundamental investigation on the adsorption behavior of metal ions on chitosan from aqueous ammonium nitrate and hydrochloric acid solutions was conducted by batch-wise examining the effects by various factors: the pH, concentrations of ammonium nitrate and hydrochloric acid, and initial metal concentration on the amount of metals adsorbed. In order to prevent the dissolution loss of chitosan into an acidic aqueous solution, crosslinked copper(II)-complexed chitosan was prepared and its adsorption behavior was compared with that of the original chitosan. The amount of adsorption, not only of metal ions, but also of the hydrogen ion, was decreased by crosslinking in the adsorption from an ammonium nitrate solution. The decrease, however, was least for copper(II), compared with the other divalent metal ions examined: oxovanadium(II), zinc(II), nickel(II), and cobalt(II). It was considered that this result may be attributable to the ''template'' effect by the copper(II) ion, which was employed during crosslinking in order to protect the active adsorption site of chitosan from an attack by a crosslinking reagent. It was found that chitosan has an excellent loading capacity and a selectivity much greater than the commercial iminodiacetic acid type of chelating resin. A qualitative discussion is given concerning the excellent adsorption behavior. Contrary to the case of adsorption from an aqueous ammonium nitrate solution, no significant decreases in the distribution ratios were observed between the crosslinked copper-(II)-complexed chitosan and the original chitosan regarding the adsorption of palladium(II) and platinum(IV) from hydrochloric acid.