Natural and synthetic zeolites in adsorption/oxidation processes to remove surfactant molecules from water

Afsaneh Shahbazi, Rafael Gonzalez-Olmos, Frank Dieter Kopinke, Pezhman Zarabadi-Poor, Anett Georgi

Producció científica: Article en revista indexadaArticleAvaluat per experts

55 Cites (Scopus)

Resum

Iron-containing zeolites were studied as adsorbents and heterogeneous Fenton-like catalysts for the removal of the non-ionic surfactant Triton® X-100 (TX-100) from water. Adsorption tests included a variety of zeolites with different structure types (ZSM5, Beta and Y) and SiO2/Al 2O3 ratios. Zeolites with 12-membered-ring channels and high molar ratio of SiO2/Al2O3, indicating higher surface hydrophobicity, proved to be the most suitable adsorbents for TX-100. For preparation of iron-loaded zeolites, a Beta zeolite with a molar ratio of SiO2/Al2O3 of 200 was selected, based on its excellent adsorption properties, and compared with a natural zeolite of clinoptilolite type. Batch experiments indicated that both Fe-zeolites are active in the heterogeneous Fenton-like oxidation of TX-100 at neutral pH. However, the synthetic Fe-Beta zeolite was preferable compared to the Fe-loaded natural zeolite with respect to catalytic activity and H2O 2 utilization efficiency, which was interpreted in terms of differences in iron speciation and adsorption properties towards TX-100. Fe-Beta (200) was successfully applied in two cycles of adsorption/oxidation steps in a column experiment. This study shows that Fe-loaded Beta zeolites with high hydrophobicity can be suitable materials for a combined approach of adsorption/wet peroxide oxidation of chemicals with relatively high molecular weight and chain-like molecule structure, such as the non-ionic surfactant TX-100.

Idioma originalAnglès
Pàgines (de-a)1-9
Nombre de pàgines9
RevistaSeparation and Purification Technology
Volum127
DOIs
Estat de la publicacióPublicada - 30 d’abr. 2014
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