Cu- and Fe-substituted ZSM-5 zeolite as an effective catalyst for wet peroxide oxidation of Rhodamine 6 G dye

Leaching Stability and Redox Activity of Copper-MFI Zeolites Prepared by Solid-State Transformations: Comparison with Ion-Exchanged and Impregnated Samples

“…The leaching effect is enhanced by lowering the pH of aqueous solutions. As our experience shows [ 8 , 10 , 11 , 12 ], the leaching effect is more destructive for Cu-zeolite, when inorganic acids are formed during CWPO of the organic ecotoxicant, for example, the hydrochloric acid or nitric acid at degradation of Rhodamine 6G [ 8 , 13 , 47 ]. For example, the copper leaching from 1%Cu-ZSM-5-IEX was as high as 41% after CWPO of Rhodamine 6G [ 13 ], and near 10% after CWPO of formic acid [ 10 ] and phenol [ 11 ].…”

“…Both of them dissolve in the 1.2 M HCl solution during the differentiating dissolution due to the surface and subsurface localization of these structures in the silicalite matrix, as well as the property of CuO to interact with hydrochloric acid. The sufficiently high propensity of these structures to dissolve in acidic solutions prevents the use of catalysts based on them in reactions occurring in aqueous media (e.g., catalytic wet peroxide oxidation of Rhodamine 6G [ 13 ] and other dyes) due to the high leaching of the active component (achieving values as high as 80% [ 10 ]).…”

“…Today, copper-containing MFI is intensively considered as a promising catalyst for catalytic wet peroxide oxidation (CWPO) of organic contaminants, such as phenol and textile dyes [ 7 , 8 , 9 , 10 , 11 , 12 ]. Cu-ZSM-5 zeolites were shown to be more efficient than Fe-containing ones in CWPO of formic acid, phenol and Rhodamine 6G [ 7 , 8 , 10 , 13 ]. The former can provide the complete destruction of phenol and high mineralization of total organic compounds without leaching of a considerable quantity of copper to the solution [ 5 ].…”

Coal Fly Ash‐based P Zeolite‐anchored CuxO as an Efficient Catalyst for Heterogeneous Photo‐Fenton Degradation of Methylene Blue

“…These holes are conducive to the adsorption and activation of H 2 O 2 in the catalyst. Meanwhile, the porous structure on the catalyst surface promotes the reaction of dye molecule with H 2 O 2 on the catalyst surface [69,70] . Therefore, the dye molecule can be adsorbed and degraded on the catalyst surface.…”

“…[41][42][43][44] To further strengthen catalytic activity, Cu-containing catalysts are usually supported on carriers such as Al 2 O 3 , [8,45,46] silica, [47] carbon materials [48] and zeolites. [49][50][51][52][53][54][55][56] Mn and Cu are loaded into the UiO-66@Al 2 O 3 ceramic tube (UiO-66CT) membrane as catalysts for treating phenolic wastewater. Cu-UiO-66CT displayed better catalytic performance than that of Mn-UiO-66CT.…”