改性茶皂素对重金属铬吸附性能的研究

摘要

探索了一条通过将茶皂素的羟基采用醋酸酐/碘体系进行酯化,再由硼氢化钠/氯化锌体系还原,最后用双氧水氧化多羟基茶皂素制得多羧基茶皂素的茶皂素改性路线.该方法在保证茶皂素原有生物活性以及良好水溶性的前提下,增加茶皂素分子的活性羧基,提高对重金属镉的吸附效果.结果表明,茶皂素对重金属镉的去除率为32%,改性后茶皂素对重金属镉的去除率为54%.%A new way to improve the efficiency of the cadmium adsorption was studied by tea saponin in the condition of keeping the bioactivity and water solubility of tea saponin.Firstly,acetylated the hydroxyl groups of tea saponin by acetic anhydride/iodine system;secondly,reduced the acetated tea saponin by sodium borohydride/zinc chloride system;finally,oxidated polyhydroxyl tea saponin by hydrogen perox-ide.Results showed that the removal rate of tea saponin on heavy metal cadmium was 32%,while the re-moval rate of modification of tea saponin on heavy metal cadmium was 54%.