Abstract
In the present work, visible light active bismuth oxyiodide (BiOI) was immobilized on a commercial, non-conductive support (an Al2O3 based ceramic paper) using a novel two-step spray coating technique and investigated with different characterization methods (e.g., SEM, Raman, XPS). Our main goal was to eliminate the separation costs after the photocatalytic measurement and investigate the chemical relevance and opportunity to use this technique in the industry. Our as-prepared uniform BiOI layer had similar properties to the well-known reference BiOI powder. The Raman and XPS measurements confirmed that the enriched amount of the surface iodine defined the color and as well the band gap of the BiOI layer. The durable BiOI layers have prominent photocatalytic activity under UV and visible light irradiation as well. The scale-up procedure proved that the designed BiOI coated paper was reusable and potentially applicable in the industry by straightforward scale-up, which is due to the elaborated non-conventional BiOI coverage estimation method. This immobilization technique could open several opportunities for immobilizing many other visible light active photocatalysts with simple materials and low cost.
Highlights
The scale-up procedure proved that the designed bismuth oxyiodide (BiOI) coated paper was reusable and potentially applicable in the industry by straightforward scale-up, which is due to the elaborated non-conventional BiOI coverage estimation method
Photocatalysis has progressed significantly as a water treatment method and reached such a technological level of expansion that developing countries can afford their application for water treatment, because nowadays the applied semiconductors possess sufficiently high degradation yields, and low production cost
All coated ceramic paper showed diffraction peaks corresponding to BiOI (JCPDS card number: 10-0455)
Summary
Photocatalysis has progressed significantly as a water treatment method and reached such a technological level of expansion that developing countries can afford their application for water treatment, because nowadays the applied semiconductors possess sufficiently high degradation yields, and low production cost. UV active titanium dioxide was used in photocatalytic water purification applications and on the semi-industrial scale (both immobilized and in suspension as well) [2,3,4,5]. This material has some advantages and disadvantages [6], but it is much more critical to solve the immobilization related problems. Several visible light active photocatalysts are accessible; the chosen semiconductor must have appropriate physical and chemical properties, like titanium dioxide, such as photostability, chemical, and biological inertness, etc.
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