article · Materials
Researchers developed a bismuth tungstate photocatalyst using a chemical precipitation method to degrade organic pollutants in an environmentally friendly manner. Material characterisation confirmed the formation of a well-crystallised orthorhombic phase. The investigation focused on tuning the annealing temperature to modify the crystal structure, morphology, optical behaviour, and photoelectrochemical characteristics of the catalyst, which directly influenced its breakdown efficiency. When tested under 120 minutes of illumination, the material decomposed 97 percent of Rhodamine B and 92 percent of methyl orange, achieving chemical oxygen demand reductions of 82 percent and 79 percent, respectively. Mechanistic testing using impedance spectroscopy, photocurrent analysis, photoluminescence, and radical trapping demonstrated that superoxide radicals and positive holes are the primary active agents driving pollutant photodegradation.
Organic dyes and industrial pollutants present severe challenges for water quality and environmental safety. Developing effective photocatalytic materials that degrade contaminants under light offers a sustainable approach to wastewater treatment. By showing how annealing temperatures alter the functional properties and decomposition efficiency of bismuth tungstate, this research offers clearer guidance for producing more active materials for environmental decontamination.
The material could enable water purification systems designed to remove hazardous organic dyes from industrial wastewater. The most relevant end users would be water treatment equipment manufacturers, industrial effluent treatment facilities, and environmental remediation services. Because testing was conducted on laboratory dye solutions over 120 minutes of illumination, this technology remains at an early stage of research and requires pilot-scale testing on complex, real-world industrial wastewater before commercial viability can be assessed.
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In this study, a chemical precipitation approach was adopted to produce a photocatalyst based on bismuth tungstate Bi<sub>2</sub>WO<sub>6</sub> for enhanced and environmentally friendly organic pollutant degradation. Various tools such as X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), optical spectroscopy and X-ray photoelectron spectroscopy, were employed to assess the structural and morphological properties. Hence, the XRD profiles showed a well crystallized Bi<sub>2</sub>WO<sub>6</sub> orthorhombic phase. The photocatalytic performance of the resulting photocatalyst was assessed by the decomposition of Rhodamine B (RhB) and methyl orange (MO) with a decomposition efficiency of 97 and 92%, along with the highest chemical oxygen demand of 82 and 79% during 120 min of illumination, respectively. The principal novelty of the present work is to focus on the changes in the crystalline structure, the morphology, and the optical and the photoelectrochemical characteristics of the Bi<sub>2</sub>WO<sub>6</sub>, by tuning the annealing temperature of the designed photocatalyst. Such physicochemical property changes in the as-prepared photocatalyst will affect in turn its photocatalytic activity toward the organic pollutant decomposition. The photocatalytic mechanism was elaborated based on electrochemical impedance spectroscopy, photocurrent analysis, photoluminescence spectroscopy, and radical trapping measurements. The overall data indicate that the superoxide O<sub>2</sub><sup>•-</sup> and holes h<sup>+</sup> are the principal species responsible for the pollutant photodegradation.
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DOI: 10.3390/ma17051029
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