芹菜根细胞壁对镉的吸附固定机制及其FTIR表征研究

对芹菜根细胞壁Cd的吸附固定机制开展了相关研究.芹菜根细胞壁Cd吸附的动力学实验研究表明,根细胞壁经酯化改性处理后其对Cd的累积吸附量相对降低了42.6%,经氨基甲基化改性处理后其对Cd的累积吸附量相对降低了21.0%,经果胶酶改性处理后其对Cd的累积吸附量相对降低了40.5%.同时,利用傅立叶红外光谱技术表征了芹菜根细胞壁上Cd吸附位点的官能团信息.研究结果表明,Cd主要与细胞壁纤维素、半纤维素和木质素中的羧基官能团发生结合作用,同时,根细胞壁上的蛋白质和果胶质也参与了Cd的结合.

Adsorption and fixation mechanism of cadmium on celery(Apium graveolens L.) root cell wall and the analysis of FTIR spectra

The adsorption and fixation mechanism of cadmium on celery (Apium graveolens L.) root cell wall was investigated. The Cd adsorption kinetics experiments on the celery root cell wall showed that the amount of Cd absorbed by the root cell wall varied after modified treatments compared to the unmodified, reducing by 42.6% after esterifing, 21.0% via aminomethylation and 40.5% with pectinase. Meanwhile by using Fourier transform infrared spectrum, information was characterized about the functional groups of Cd adsorption sites on the celery root cell wall. It was indicated that Cd mainly bound with the carboxyl functional groups in the cellulose, hemicellulose and lignin; moreover protein and pectin on the root cell wall are also involved in the binding of Cd.