全氟辛酸在土壤介質(zhì)上吸附平衡的研究
[Abstract]:Perfluorocarbons (PFCs) have been widely used in the world for 50 years. Their applications include daily necessities, pharmaceuticals and aviation industry. In 2009, perfluorocarbons have been listed as persistent organic compounds under the Stockholm Convention. After entering the environment, complex physical chemical reactions will take place with the environmental media, which will affect its migration and transformation in the environment. Perfluorocarbons entering the environment will do harm to ecosystem and human health. Scholars at home and abroad have done some research on the transport and transformation of perfluorocarbons in the environment, but the adsorption characteristics and mechanisms of perfluorocarbons in different soils and soil media are not very clear. In this paper, the adsorption characteristics and mechanism of perfluorooctanoic acid (PFOA) to PFOA in ten different soils were investigated, and the common goethite in soil was studied in detail. The adsorption characteristics and mechanism of montmorillonite and humic acid on PFOA. The main conclusions are as follows: 1. The adsorption characteristics of PFOA on ten different soils were studied. It was found that the adsorption of PFOA on soil S01-S10 reached a complete desorption equilibrium at 24 h, and the adsorption kinetics could be fitted well with the Lagrange second-order kinetics. Fitting the correlation coefficient R20.9. the adsorption and desorption isotherm showed that the adsorption of PFOA on soil had obvious linear partition effect. The adsorption and desorption isotherms can be fitted well by Freundlich and liner models. The adsorption of PFOA on soil is closely related to the mineral composition, content and organic matter content in soil. Hydrophobicity may be the main mechanism of PFOA adsorption on soil. 2. The adsorption of PFOA by goethite (Goethite) and montmorillonite (Montmorillonite) reached a complete adsorption and desorption equilibrium at 24 h. The adsorption kinetics was fitted well by Lagrange's second-order kinetics, and the fitting coefficient R2 was 0.999. The adsorption of PFOA on goethite can be well fitted by linear model, and the adsorption of PFOA on montmorillonite by Langmuir model. From the FTIR and XRD, of goethite montmorillonite before and after adsorption of PFOA, it can be inferred that the adsorption mechanism of PFOA between goethite and montmorillonite is different. The adsorption of PFOA to goethite may be mainly affected by electrostatic interaction and hydrogen bonding, while the adsorption of PFOA by montmorillonite may be dominated by hydrogen bonding between montmorillonite layers. 3.PFOA in humic acid (Humic Acid, At 24 h, the adsorption and desorption equilibrium can be achieved, and the adsorption kinetics can be fitted well with Lagrange's second order kinetics. The adsorption isotherms were fitted by Liner,Freundlich and Langmuir models, and R2 was greater than 0.95N _ 1, which indicated that the adsorption of PFOA by HA was mainly carried out by the active sites on the surface of HA. Hydrophobicity distribution may also be the main mechanism of PFOA adsorption on HA.
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:X53
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