Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9279
Title: Catalytic consequences of charge-balancing cations in zeolite during photo-Fenton oxidation of formaldehyde in alkaline conditions
Authors: Macdonald, MJ
Wu, Z
Ruzicka, JY
Golovko, V
Tsang, DCW 
Yip, ACK
Keywords: Brønsted acid sites
Microporous channel
Photo-Fenton
Zeolite
Issue Date: 2014
Publisher: Pergamon Press
Source: Separation and purification technology, 2014, v. 125, p. 269-274 How to cite?
Journal: Separation and purification technology 
Abstract: In this study, three forms of faujasite zeolite Y, i.e. ammonium, proton and sodium form, were tested as catalyst supports for ferric ions (Fe 3+) in the oxidation of aqueous formaldehyde (FA) in the presence of H2O2 and UVC. The effect of charge-balancing cations on the FA oxidation at acidic and alkaline conditions was investigated using a batch reactor. The results showed that the three tested catalysts behave similarly at pH 3. However, the presence of charge-balancing proton gives the highest conversion of FA (26%) after 120 min at pH 7, which is comparable to the results obtained at pH 3, indicating the confined space in the supercage of Fe/H-Y provides a pH environment for Fenton reaction different to that provided by Fe/NH4-Y and Fe/Na-Y. Turnover frequency given by Fe/H-Y is more than 3 times faster than that given by Fe/NH4-Y or Fe/Na-Y. We proposed the surface proton, which is in close proximity to Fe3+, mitigates the leaching of metal and allows photo-Fenton process similar to what is generally observed at acidic pH condition. No change in solution pH was observed after the addition of all three tested form of zeolite. We concluded that the localized acidic setting given by the proton inside the porous structure of zeolite is able to promote photo-Fenton reaction at alkaline condition in a convenient and effective way.
URI: http://hdl.handle.net/10397/9279
ISSN: 1383-5866
EISSN: 1873-3794
DOI: 10.1016/j.seppur.2014.02.005
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