Efficient and Sustainable Photocatalyst for Dye and Antibiotic Removal

Researchers developed a sustainable photocatalyst by combining tin quantum dots with titanium dioxide and biochar. This composite efficiently removes organic pollutants like dyes and antibiotics from wastewater, thanks to enhanced light absorption and electron transfer, offering an eco-friendly solution for water purification.

August 15, 2024

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Gao, et al (2024) Construction of S-scheme heterojunction within Sn QDs/TiO₂@N, O-containing biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More composite photocatalyst for efficient removal of dye and antibiotic. *Journal of Alloys and Compounds.* https://doi.org/10.1016/j.jallcom.2024.175863

Researchers have developed a novel photocatalyst that promises efficient removal of organic pollutants, specifically dyes and antibiotics, from wastewater. The study introduces a composite material combining tin quantum dots (Sn QDs) with titanium dioxide (TiO2) and biochar derived from biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More. The composite, Sn QDs/TiO2@biochar, is designed using a simple, cost-effective, and environmentally friendly method, leveraging waste resources.

Titanium dioxide is widely recognized for its photocatalytic properties, but its effectiveness is limited by its wide bandgap, which restricts its light absorption range, and the quick recombination of electron-hole pairs generated during the process. The new composite addresses these issues through the creation of an S-scheme heterojunction, a specific configuration within the material that enhances electron transfer and extends light absorption across a broader spectrum.

The study optimized the photocatalyst by adjusting variables like pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More temperature, biomass quantity, and tin content. The result is a material that exhibits superior adsorptive and photocatalytic performance under UV and visible light. It effectively removes high concentrations of methylene blue dye and tetracycline hydrochloride, a common antibiotic, from water.

This research highlights the potential of combining metal quantum dots and biochar in photocatalysts, offering a sustainable solution for environmental protection through enhanced pollutant degradation and resource utilization.