为了提高猪皮胶原纤维(CF)对废水中 Cr3+的吸附效率，以乙醛酸(GA)为改性剂，对 CF 进行羧基化改性，制备了一种胶原纤维基吸附材料；采用化学分析法分别测定了改性前后胶原纤维中氨基及羧基含量，并通过zeta电位分析仪对改性前后的胶原纤维的等电点进行了测定。结果表明，改性后胶原纤维氨基含量降低69.23%，羧基含量增加了约52.77%，等电点由原来的6.91降低至5.45；比表面积及空隙率测定结果表明乙醛酸改性可有效增加胶原纤维的比表面积，降低其孔隙率；采用 SEM、FT-IR、DSC 对改性前后胶原纤维的组织形态、分子结构及热性能进行了表征，通过胶原修饰和氨基酸分析对羧基化改性机理进行了研究。
The carboxylated collagen fiber (CCF)was prepared by modifying collagen fiber (CF)with glyoxylic acid.The contents of amino and carboxyl of CF and CCF were measured by chemical analysis methods,and the isoelectric point of CF and CCF was determined by zeta potential analyzer.The results indicated that the amino content decreased by 69.23% while carboxyl content increased by 52.77% after modification,and the isoelectric point from 6.91 down to 5.45.The result of surface area and porosity determination showed that the acetalde-hyde acid modification can effectively increase the specific surface area and reduce the porosity of the collagen fi-ber.Furthermore,the form,structure and thermal properties of CF and MCF were characterized and analyzed by SEM,FT-IR and DSC respectively.Finally,the reaction mechanism between aldehyde acid and collagen fi-ber was studied by means of collagen molecule modification and amino acid analysis.
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