新型氨化菌丝体吸附剂的制备及吸附典型内分泌干扰物的研究

Preparation of a Novel Aminated Fungal Biomass and Its Sorption for Typical Endocrine Disruptors

以产黄青霉(Penicillium chrysogenum)菌丝体为原料,通过2步化学反应将含有大量氨基的聚乙烯亚胺(PEI)嫁接到菌丝体表面,优化反应条件,得到最佳的氨化菌丝体吸附剂.该氨化吸附剂的等电点为pH 10.2,是一种表面带正电荷的菌丝体吸附剂,能有效吸附水中的阴离子内分泌干扰物五氯酚钠(PCP)、2,4-二氯苯氧乙酸(2,4-D)和全氟辛烷磺酸钾(PFOS).3种污染物的吸附等温线符合Langmuir方程,15℃时最大吸附量分别为342.9、234.1、1 725.6 mg/g.热力学计算表明,3种污染物的吸附均是自发发生的,2,4-D和PFOS的吸附是吸热反应,而PCP是放热反应.

The fungal biomass of Penicillium chrysogenum was used as raw materials to prepare the sorbent, and polyethylenimine （PEI） was grafted onto the biomass surface in a two-step reaction. The best sorbent was obtained through the optimization experiments. As the PEI-modified biomass was found to possess zero Z-potential at pH 10.2, the biosorbent is favorable for the removal of anionic pentachlorophenol （PCP）, 2,4-dichlorophenoxyacetic acid （2,4-D） and pertluorooctane sulphonate （PFOS） potassium in water. The sorption isotherms of the biomass for three pollutants were well described by Langmuir equation, with a maximum sorption at 342.9 mg PCP, 234.1 mg 2,4-D and 1725.6 mg PFOS per g biomass. The thermodynamic parameters calculated show that the sorption for three pollutants was spontaneous, and the sorption for 2,4-D and PFOS were endothermic, while the sorption for PCP was exothermic.