Natural clay minerals as heterojunctions of multi-metal oxides for superior photocatalytic activity

[Display omitted] •Natural clay minerals from Mecca province have been successfully prepared and characterized.•Mecca clays can be regarded as heterojunction of multi- metal oxides and carbonate.•Mecca clays show superior photocatalytic activity for dye and phenol degradation. In this study, natural...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2022-12, Vol.286, p.116077, Article 116077
Main Authors: Mohamed, Hanan H., Wazan, Ghaidaa, Besisa, Dina H.A.
Format: Article
Language:English
Subjects:
Aluminum oxide
BPB
Calcium carbonate
Catalytic activity
Charge transfer
Clay minerals
Copper
Current carriers
Heterojunctions
Manganese
Metal oxides
Multi-Metal Oxide
Natural Clay
Phenol
Photocatalysis
Silicon dioxide
Silver
Titanium dioxide
Zirconium
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Summary:[Display omitted] •Natural clay minerals from Mecca province have been successfully prepared and characterized.•Mecca clays can be regarded as heterojunction of multi- metal oxides and carbonate.•Mecca clays show superior photocatalytic activity for dye and phenol degradation. In this study, natural clay samples from Mecca province have been prepared and characterized using various techniques. The investigated Clay samples can be regarded as multi- metal oxides (SiO2, Al2O3, Fe2O3 and TiO2), and CaCO3 doped with different elements such as K, Mn, Zr, Zn, V, Cu, Sr, Ag. The photocatalytic activity of clay materials was evaluated for degradation of dye and phenol. The results have shown superior photocatalytic activity of clay materials as compared to pure TiO2. The higher activity of clay materials is related mainly to the composition of the clay particles of various metal oxides acting as heterojunctions with effective charge carrier separation and charge transfer, in addition to high surface area and the suitable band gap. It is concluded that, clay materials can be regarded as green standalone photocatalysts for various environmental and energy applications.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2022.116077