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采用浸润-高温改性方法简易合成了磁性活性炭(GAC-Fe_3O4),考察改性前后吸附材料对全氟辛酸(PFOA)的吸附性能。用SEM、FT-IR、XRD、BET和孔隙结构以及磁性能和载铁量进行表征分析。结果表明,GAC-Fe_3O4表面已成功负载上了Fe_3O4颗粒,且属于纳米级,对GAC表面的微孔造成堵塞的同时增加了吸附点位。用等温吸附模型和动力学模型拟合了GAC和GAC-Fe_3O4对PFOA的吸附过程,探索了不同初始pH值对PFOA的吸附性能影响及对GAC和GAC-Fe_3O4的Zeta电位影响。吸附实验结果表明,GAC-Fe_3O4对PFOA的最大吸附量为588.24mg/g,比GAC高47.06%,在100h左右达到吸附平衡,且在酸性环境(pH=3)下,对PFOA的吸附效果最好。GAC和GAC-Fe_3O4对PFOA的吸附过程符合Langmuir等温吸附模型和拟二级动力学模型,吸附机理主要为静电作用,疏水作用可能参与其中。
Abstract：The magnetic activated carbon(GAC-Fe_3O4) was synthesized by infiltration-high temperature modification method. The adsorption properties of the adsorbent on perfluorooctanoic acid(PFOA) before and after modification were investigated. The GAC and GAC-Fe_3O4 were characterized by SEM, FT-IR, XRD, BET and pore structure as well as magnetic performance and iron loading. The results showed that the surface of GAC-Fe_3O4 had been successfully loaded with Fe_3O4 particles, and it belongs to the nano-scale, which caused blockage of the micropores on the surface of GAC and increased the adsorption site. The adsorption process of PFOA by GAC and GAC-Fe_3O4 was fitted by adsorption isotherm model and kinetic model. The effects of different initial pH on the adsorption performance of PFOA and the Zeta potential of GAC and GAC-Fe_3O4 were investigated. The results of adsorption experiments showed that the maximum adsorption amount of GAC-Fe_3O4 to PFOA was 588.24 mg/g, which was 47.06% higher than that of GAC, and reached the adsorption equilibrium at about 100 h. In the acidic environment(pH=3), the adsorption effect on PFOA was the best. The adsorption process of PFOA by GAC and GAC-Fe_3O4 was well fitted by Langmuir isotherm model and Quasi-secondary kinetic model. The adsorption mechanism is mainly electrostatic interaction, and hydrophobic interaction may be involved.
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基本信息:
DOI：10.16026/j.cnki.iea.2019040363
中图分类号:X592;TQ424.1
引用信息:
[1]肖静,许秦坤,许建红,等.磁性颗粒活性炭对PFOA的吸附性能研究[J].离子交换与吸附,2019,35(04):363-374.DOI:10.16026/j.cnki.iea.2019040363.
基金信息:
西南科技大学博士基金(12zx7120)