SYNTHESIS OF g-C3N4/METAL-SBA-15 COMPOSITE: STUDY OF THE INFLUENCE OF THE DIFFERENT METALS ANCHORED IN THE SUPPORT.
Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional
Abstract
Carbon nitride (g-C3N4) polymers have garnered considerable attention from the environmental and
energy sectors due to their low cost, low toxicity, unique structural and physicochemical properties,
and their high physical and chemical stability; they find application as catalysts, as electrodes, as
optoelectronic materials, etc. These materials primarily composed of carbon and nitrogen can be
synthesized using various methods, but thermal polymerization employing low-cost raw materials
containing carbon and nitrogen predominates. This study synthesized g-C3N4 supported
Metal-SBA-15 mesoporous materials by evaluating the effect of metal on g-C3N4 formation.
Carbon nitrides were synthesized using urea through the thermal polymerization method. Various
supported carbon nitrides on mesoporous materials from the Si-based SBA-15 family were prepared.
Additionally, a series of materials containing Ga, Al, Sn, and Zr anchored on SBA-15 (with Si/Metal
ratio of 20) were tested. The attained g-C3N4/Metal-SBA-15 composites were characterized by XRD,
ICP, EA, HR-TEM, SEM-EDX, and N2 adsorption isotherms, among others.
To explore the chemical structure of the composites, the chemical bonds existing within the g-C3N4
structure were investigated by FT-IR spectroscopy. The FT-IR spectra of g-C3N4 samples, displayed
characteristic peaks at 810 cm-1, 1410 cm-1, 1645 cm-1, and 3100– 3300 cm-1, which describe bending
modes characteristic of the out-of-plane tri-units of triazine and C=N, stretching vibrations typical of
the C=N and C–N bonds of aromatic CN heterocycles, and the stretching mode of the N‒H bond of
non-condensed terminal amino groups, respectively. While SBA-15 material without metal did not
exhibit absorption bands characteristic of a g-C3N4, Ga-SBA-15 and Zr-SBA-15 materials exhibited
weak absorption bands in the region of 1100 and 1700 cm-1. Interestingly, materials containing
aluminum and tin not only exhibited the characteristic bands of SBA-15 but also added the typical
bands of g-C3N4. These results, also confirmed by other analysis, revealed that the g-C3N4 chemical
structure was efficiently supported onto the metal-containing mesoporous materials.
To complete the study, carbon nitride materials were attempted to be synthesized with sulfated
zirconia/SBA-15 at different Si/Metal ratios. The results obtained were promising, thus allowing
proving the positive effect of S species on the g-C3N4 formation.
Description
Keywords
Carbón nitride polymers, Termal polimeryzation
Citation
International materials research congress 2023.
Endorsement
Review
Supplemented By
Referenced By
Creative Commons license
Except where otherwised noted, this item's license is described as info:eu-repo/semantics/openAccess