壳聚糖金属离子配合物吸附尿素性能研究

由于尿素吸附剂存在吸附容量低、吸附选择性差、生物相容性和血液相容性差等缺点，使人工肾和口服尿素吸附剂的应用受到限制．近几年，尿素吸附材料方面的研究进展较快，主要有：１９９０年，藤田良枝用活性炭作尿素吸附剂，吸附量为９０ｍｇ／ｇ（尿素初始浓度为２１００ｍｇ／Ｌ），吸附容量低，且微炭粒易脱落，有造成栓塞的危险，不宜作人工肾材料［１］；１９９３年，何炳林等用交联聚丙烯酸固载化氧化β环糊精作尿素吸附材料，吸附容量较高，为８２１ｍｇ／ｇ（尿素的初始浓度为１３００ｍｇ／Ｌ）．由于其利用的是Ｓｃｈｉｆｆ…

Study on the Sorption Characteristic with Chitosan\|metal Complexes for Urea

Chitosan is a nontoxic natural polysaccharide with good biocompatibility.It can form polymer\|metal complexes with many metal cations for its extra electron pair of nitrogen.The complexes exhibit high sorptive capacity and good selectivity for urea.The sorption capacity was influenced by the metal content in the complex,time of sorption,concentration of urea etc.The sorption capacities were 83.6,79.1,72.9,69.4 and 53.4 mg/g for urea by the chitosan metal complexes of Cu(Ⅱ),Cd(Ⅱ),Co(Ⅱ),Zn(Ⅱ) and Fe(Ⅲ),respectively at pH 6.0 and the concentration of urea being 1 300 mg/L.