光降解
全氟辛酸
沸石
化学
水溶液
吸附
无机化学
光催化
金属
离子交换
水溶液中的金属离子
催化作用
环境化学
离子
有机化学
作者
Lin Qian,Hongying Zhao,Ariette Schierz,Katrin Mackenzie,Anett Georgi
出处
期刊:ACS ES&T engineering
[American Chemical Society]
日期:2024-02-15
卷期号:4 (3): 748-757
被引量:3
标识
DOI:10.1021/acsestengg.3c00462
摘要
Treating perfluorooctanoic acid (PFOA) in an aqueous environment is problematic due to its low concentration and its high resistance to biological and chemical degradation. To tackle this challenge, combinations of pre-enrichment and photodegradation processes are promising solutions. In this work, we investigated metal ion-exchanged zeolites as adsorbents and photocatalysts for PFOA treatment. Among various transition metal ion-exchanged BEA zeolites, Fe-exchanged BEA (Fe-BEA) zeolites showed significant activity for the photodegradation of PFOA. The isolated iron species in Fe-BEA zeolite are responsible for PFOA photodegradation, whereas other iron species present from excess iron loading in the zeolite will lower its photocatalytic activity. Furthermore, it was proved via size exclusion tests using branched PFOA isomers that the photodegradation of PFOA took place on the internal surface rather than the external surface of Fe-BEA zeolite. Photodegradation of PFOA was also tested to be effective with Fe-exchanged BEA-type zeolites having various SiO2/Al2O3 ratios, but ineffective with FAU-type zeolites. The optimal Fe-BEA zeolite showed a sorption coefficient Kd of 6.0 × 105 L kg–1 at an aqueous phase PFOA concentration of 0.7 μg L–1 and a PFOA half-life of 1.8 h under UV-A irradiation. The presented study offers a deeper understanding of the use of metal ion-exchanged zeolites for photodegradation of PFOA.
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