【摘要】 目的制备结构相似、键型不同的壳聚糖(CTS)-水杨酸(醛、酮)系列衍生物,考察不同修饰物对溶解度和对金属离子吸附作用的影响。方法一步法制备水杨酰基和水杨醛基壳聚糖衍生物,用化学检识、热分析等方法对其进行表征,用返滴定法测定对Pb2+和Zn2+等重金属离子的吸附作用。结果CTS-水杨酰基系列衍生物的溶解度高于CTS的溶解度,且接枝率越高,溶解度越大;CTS-水杨醛基系列衍生物的溶解度低于CTS,接枝率越高,溶解度越低。2个系列修饰物对金属离子的吸附作用都低于CTS,且接枝率越高,吸附作用越低。但酰基衍生物对金属离子的吸附能力高于西佛碱衍生物。接枝率在50%以上时,西佛碱衍生物对Pb2+和Zn2+的吸附能力几乎为零;酰基衍生物对Pb2+仍具有一定的络合作用。结论水杨酰基壳聚糖的溶解度高于水杨醛基壳聚糖,CTS的2-位NH保留1个氢原子有助于提高修饰物的溶解度;高接枝率的水杨酰基-壳聚糖有可能成为Pb2+的高效解毒剂。更多还原

【Abstract】 OBJECTIVE To prepare series ramification of Chitosan-g-Salicylic acid and Chitosan-g-Salicylic aldehyde,which have similar structure and different bonds,and to examine the solubility of modifiers and the adsorption to Pb²⁺ and Zn²⁺.METHODS Ramification of Salicylic acyl-Chitosan and Salicylic aldehyde-Chitosan was separately prepared by one-step method,and was characterized by chemical methods and thermal analysis.The adsorption to Pb²⁺ and Zn²⁺ was examined by titration method.RESULTS Solubility of series ramification of Salicylic acyl-Chitosan was larger than that of Chitosan.The higher the graft ratio,the bigger the solubility.Solubility of series ramification of Salicylic aldehyde Chitosan was less than that of Chitosan.The higher the graft ratio,the smaller the solubility.The adsorption of Chitosan-g-Salicylic acid and Chitosan-g-Salicylic aldehyde to Pb²⁺ and Zn²⁺ was smaller than that of Chitosan.The higher the graft ratio,the less the adsorption,but the adsorption of the former to Pb²⁺ was larger than the latter.CONCLUSIONS Solubility of series ramification of Salicylic acyl-Chitosan is larger than that of series ramification of Salicylic aldehyde-Chitosan.It is important that NH within Chitosan should be saved to increase the solubility when modified.更多还原