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Mahfoozi, Fatemeh, Mahmoudi, Ali, Sazegar, Mohammad Reza, Nazari, Khodadad. (1401). Transition-metal modified mesoporous silica nanoparticles as highly effective heterogeneous catalysts for discoloration of Basic red 5 in aqueous solution. نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 12(2), 207-221. doi: 10.30495/ijc.2022.1949927.1911
Fatemeh Mahfoozi; Ali Mahmoudi; Mohammad Reza Sazegar; Khodadad Nazari. "Transition-metal modified mesoporous silica nanoparticles as highly effective heterogeneous catalysts for discoloration of Basic red 5 in aqueous solution". نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 12, 2, 1401, 207-221. doi: 10.30495/ijc.2022.1949927.1911
Mahfoozi, Fatemeh, Mahmoudi, Ali, Sazegar, Mohammad Reza, Nazari, Khodadad. (1401). 'Transition-metal modified mesoporous silica nanoparticles as highly effective heterogeneous catalysts for discoloration of Basic red 5 in aqueous solution', نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 12(2), pp. 207-221. doi: 10.30495/ijc.2022.1949927.1911
Mahfoozi, Fatemeh, Mahmoudi, Ali, Sazegar, Mohammad Reza, Nazari, Khodadad. Transition-metal modified mesoporous silica nanoparticles as highly effective heterogeneous catalysts for discoloration of Basic red 5 in aqueous solution. نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 1401; 12(2): 207-221. doi: 10.30495/ijc.2022.1949927.1911

Transition-metal modified mesoporous silica nanoparticles as highly effective heterogeneous catalysts for discoloration of Basic red 5 in aqueous solution

Iranian Journal of Catalysis
مقاله 8، دوره 12، شماره 2، شهریور 2022، صفحه 207-221    اصل مقاله (1.09 M)
نوع مقاله: Articles
شناسه دیجیتال (DOI): 10.30495/ijc.2022.1949927.1911
نویسندگان
Fatemeh Mahfoozi1؛ Ali Mahmoudi* 1؛ Mohammad Reza Sazegar* 1؛ Khodadad Nazari2
1Faculty of Chemistry, North Tehran Branch, Islamic Azad University, Hakimiyeh, Tehran, Iran.
2Future Bioenergy Solutions Inc., North Vancouver, BC, V7P 3P9, Canada
چکیده
Mesoporous silica nanoparticles (MSNs) were synthesized hydrothermally and modified with Co2+ and Zn2+. The as-prepared samples were denoted as MSN, Co-MSN(X), and Zn-MSN(X), where X is the Si/M molar ratio. In addition, co-modified MSN samples with both cations were also prepared and denoted as Co-Zn(Y)-MSN(X), where Y indicates the Zn2+ content in the range of 1-7 wt.% relative to Co2+. Correctness of the anticipated structures was approved by FTIR, XRD, SEM, EDX, BET, and XRF analyses. It was found that Co-Zn(7)-MSN(75) can be used as an efficient photocatalyst for discoloration of basic red 5 under very mild conditions. Up to 86% of basic red 5 was discolored after 3.75 h under the optimized conditions including catalyst dosage of 0.025 mg mL-1, pH=7, and irradiation of 4×8 W UV (254 nm) lamps. By using the Langmuir–Hinshelwood kinetics model, it was found that the reaction followed a pseudo-first-order kinetic.

تازه های تحقیق
  • Mesoporous silica nanoparticles were co-modified with Co2+, and Zn2+.
  • The product was denoted as Co-Zn(7)-MSN(75), with Si/Co= 75 and Zn/Co= 7 %.
  • Co-Zn(7)-MSN(75) showed high photocatalytic activity in discoloration of neutral red.
  • The optimized conditions include pH 7, 0.025 mg of catalyst, 0.5 M H2O2, and 32 W UV.
  • 86% of neutral red was discolored under very mild conditions within 225 min.
کلیدواژه‌ها
MSN؛ Photocatalytic؛ Discoloration؛ Basic red 5؛ Modification
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