Fe-exchanged Y zeolite as catalyst for wet peroxide oxidation of reactive azo dye Procion Marine H-EXL

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

“…When the catalyst amount was doubled, TOC elimination changed from 51.8% to 68.8%. Similar trend for the influence of cat- alyst concentration on dye oxidation was reported by Neamtu et al [2] for CWPO of reactive azo dye Procion Marine H-EXL over Fe-exchanged Y zeolite.…”

“…For this purpose, a plot of ln(1/1 − x) vs. time (where x is decolorization degree) was drawn by using decolorization data in the range of 0-30 min for a known amount of H 2 O 2 added to the solution initially. First order dependency of decolorization rate was in a good accordance with those reported in literature for dyes [2,29,30].…”

“…Initial decolorization rate decreased with the increase in initial pH value, likely due to the accelerated formation of less reactive peroxy radicals, H 2 O • , rather than OH • radicals [2].…”

“…The lower performance achieved than expected at high temperatures was attributed to the accelerated decomposition of H 2 O 2 into oxygen and water which causes a decrease in degradation degree of dye. On the other hand, the low TOC removal at higher temperature (333 K) may be explained by the production of small organic molecular fragments which are not completely mineralized under the oxidation conditions used [2].…”

“…Iron and copper containing zeolites show redox properties because these metals can change their oxidation states [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Recently, high catalytic activity of iron containing zeolites for phenol oxidation [15,16] and for degradation of dyes [2,3] has been reported. Supported Fe-saponite clay catalysts revealed to be quite active in the Fenton-like oxidation of Orange II [4].…”