Hydrothermal Crystallization of Bismuth Oxychlorides (BiOCl) Using Different Shape Control Reagents

Bismuth oxychloride photocatalysts were obtained using solvothermal synthesis and different additives (CTAB-cetyltrimethylammonium bromide, CTAC-cetyltrimethylammonium chloride, PVP-polyvinylpyrrolidone, SDS-sodium dodecylsulphate, U-urea and TU-thiourea). The effect of the previously mentioned comp...

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Bibliographic Details
Published inMaterials Vol. 14; no. 9; p. 2261
Main Authors Bárdos, Enikő, Márta, Viktória A, Fodor, Szilvia, Kedves, Endre-Zsolt, Hernadi, Klara, Pap, Zsolt
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 27.04.2021
MDPI
Subjects
Additives
Bismuth
bismuth oxychloride
Catalytic activity
Cetyltrimethylammonium bromide
Crystal structure
Crystallites
Crystallization
Energy gap
Morphology
Optical properties
Oxidation
Parameters
Phase composition
Phenols
Photocatalysis
photocatalytic activity
Photodegradation
Polyvinylpyrrolidone
Reagents
Scanning electron microscopy
Semiconductors
Shape control
Spectrum analysis
Surface tension
surfactants
Synthesis
X ray photoelectron spectroscopy
Hungary
United States > US
Japan
Germany
bismuth oxychloride
surfactants
photocatalytic activity
surface tension
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Summary:Bismuth oxychloride photocatalysts were obtained using solvothermal synthesis and different additives (CTAB-cetyltrimethylammonium bromide, CTAC-cetyltrimethylammonium chloride, PVP-polyvinylpyrrolidone, SDS-sodium dodecylsulphate, U-urea and TU-thiourea). The effect of the previously mentioned compounds was analyzed applying structural (primary crystallite size, crystal phase composition, etc.), morphological (particle geometry), optical (band gap energy) parameters, surface related properties (surface atoms' oxidation states), and the resulted photocatalytic activity. A strong dependency was found between the surface tension of the synthesis solutions and the overall morpho-structural parameters. The main finding was that the characteristics of the semiconductors can be tuned by modifying the surface tension of the synthesis mixture. It was observed after the photocatalytic degradation, that the white semiconductor turned to grey. Furthermore, we attempted to explain the gray color of BiOCl catalysts after the photocatalytic decompositions by Raman and XPS studies.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma14092261