Supercritical Carbon Dioxide-Based Processes in Photocatalytic Applications

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Conventional synthesis of heterogeneous photocatalysts often results in poor control over morphology, size, and structure, negatively impacting their activity.
• Traditional methods frequently employ toxic solvents, leading to significant environmental concerns during catalyst preparation.
• Developing efficient and environmentally friendly synthesis routes for high-performance photocatalysts is crucial for various applications.

Purpose of the Study:

• To review the emerging applications of supercritical carbon dioxide (scCO2)-assisted techniques in the synthesis of heterogeneous photocatalysts.
• To highlight the advantages of scCO2-based methods over conventional techniques for photocatalyst preparation.
• To discuss the potential of scCO2 for tailoring catalyst properties and improving photocatalytic degradation efficiency.

Main Methods:

• Review of literature on scCO2-assisted synthesis techniques for heterogeneous photocatalysts.
• Analysis of supercritical fluid processes, including supercritical antisolvent precipitation and supercritical impregnation.
• Examination of catalyst characterization and photocatalytic performance data from various studies.

Main Results:

• scCO2-assisted techniques provide superior control over catalyst morphology, size, and structure, leading to enhanced photocatalytic activity.
• These methods enable the synthesis of diverse photocatalyst structures, such as nanoparticles and metal-loaded supports.
• scCO2-based synthesis significantly reduces the use of hazardous solvents, minimizing the environmental footprint.

Conclusions:

• Supercritical carbon dioxide (scCO2)-assisted techniques represent a promising, sustainable, and versatile approach for developing advanced heterogeneous photocatalysts.
• These methods offer a pathway to high-performance photocatalysts with tunable properties for efficient degradation of various compounds.
• Further research into scCO2-based processes holds significant potential for advancing photocatalysis and green chemistry.