Cu- and Fe-Substituted ZSM-5 Zeolite as an Effective Catalyst for Wet Peroxide Oxidation of Rhodamine 6 G Dye Full article
| Journal |
Journal of Environmental Chemical Engineering
ISSN: 2213-3437 |
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| Output data | Year: 2022, Volume: 10, Number: 3, Article number : 123302, Pages count : 21 DOI: 10.1016/j.jece.2022.107950 | ||
| Tags | Catalytic wet peroxide oxidation; Cu-exchanged zeolites; Cu-ZSM-5; Fenton-like catalyst; Hydrogen peroxide decomposition; Rhodamine 6 G | ||
| Authors |
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| Affiliations |
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Funding (3)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0014 |
| 2 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0005 |
| 3 | Russian Foundation for Basic Research | 20-43-540018 |
Abstract:
Several Cu-exchanged and Fe-exchanged ZSM-5 catalysts were prepared and studied for the decoloration, degradation and mineralization of Rhodamine 6 G in catalytic wet peroxide oxidation (CWPO). The Cu-ZSM-5 catalysts were shown to be more effective than the parent H-ZSM-5 zeolites (containing Fe-ions as impurity) and Fe-exchanged ZSM-5 to Rhodamine 6 G oxidation by hydrogen peroxide. Effects of copper loadings, Si/Al ratio, structure of copper species, and initial pH were ascertained on catalytic behavior of Cu-ZSM-5 and copper leaching under CWPO conditions. At acid pH, the highest decoloration of Rhodamine 6 G was typical of Cu-ZSM-5 with Si/Al equal to 30 and Cu content of ca. 0.5-0.65 wt% having isolated Cu2+ ions, whereas the maximal conversions of total organic carbon (TOC) were exhibited by catalysts with 1.5-2.8 wt% Cu and CuO-like clusters on the external zeolite surface. At alkali pH, the over-exchanged 2.8% Cu-ZSM-5 with CuO-like clusters was more active than under-exchanged 0.5% Cu-ZSM-5 to decoloration of Rhodimine 6 G, while both catalysts provided identical TOC conversions. Catalyst with 0.5 wt% copper loading showed reproducible activity up to 7th cycle. According to UV-Vis DR and EPR studies, the high efficiency of Cu-ZSM-5 to Rhodamine 6 G oxidation in acid solution is provided by the isolated Cu2+ ions, while the nanostructured square-planar CuO-like clusters (on the zeolite surface) ensure activity at alkali pH. Two mechanisms of organic substrate oxidation, i.e. radical (Fenton-like) mechanism activated by isolated Cu2+ ions and nucleophilic substitution via copper-hydroperoxide complex generation, were discussed.
Cite:
Yashnik S.A.
, Taran O.P.
, Surovtsova T.A.
, Ayusheev A.B.
, Parmon V.N.
Cu- and Fe-Substituted ZSM-5 Zeolite as an Effective Catalyst for Wet Peroxide Oxidation of Rhodamine 6 G Dye
Journal of Environmental Chemical Engineering. 2022. V.10. N3. 123302 :1-21. DOI: 10.1016/j.jece.2022.107950 WOS Scopus РИНЦ ANCAN OpenAlex
Cu- and Fe-Substituted ZSM-5 Zeolite as an Effective Catalyst for Wet Peroxide Oxidation of Rhodamine 6 G Dye
Journal of Environmental Chemical Engineering. 2022. V.10. N3. 123302 :1-21. DOI: 10.1016/j.jece.2022.107950 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jan 11, 2022 |
| Accepted: | May 18, 2022 |
| Published online: | May 21, 2022 |
| Published print: | Jun 1, 2022 |
Identifiers:
| Web of science: | WOS:000816125400005 |
| Scopus: | 2-s2.0-85132034842 |
| Elibrary: | 48721568 |
| Chemical Abstracts: | 2022:1693139 |
| Chemical Abstracts (print): | 179:211200 |
| OpenAlex: | W4281262021 |