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Eco-Friendly Synthesis of Visible-Light Responsive Ultrathin BiOCl Nanosheets with Highly Exposed {110} Facets and Enriched Oxygen Vacancies for the Photocatalytic Abatement of Organic Pollutants
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DOI：10.1007/s10876-026-03076-1.png)
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Abstract
En 中文
A green, sustainable, low temperature hydrothermal method is reported for the facile, cost-effective, eco-friendly synthesis of ultrathin BiOCl nanosheets with exposed {110} facets and enriched oxygen vacancies for the first time, using seawater as a precipitant and universal solvent and aloe-vera gel as a structure-directing agent. No harsh chemicals and special synthetic conditions were employed in the present method and the prepared sample was completely characterized. The XRD analysis confirmed the formation of tetragonal crystalline structure with highly exposed {110} facets. The two-dimensional nanosheet like surface morphology with an ultrathin lamellar structure was confirmed by the electron microscopic studies. The existence of high-density oxygen vacancies was validated by ESR characterization. The optical analysis indicated the visible light absorption of the BiOCl with a reduced band gap of 2.71 eV. The catalytic activity of the ultrathin BiOCl nanosheets was investigated for the visible-light driven photocatalytic degradation of methylene blue and tetracycline pollutant in aqueous medium and the sample attained a highest degradation efficiency of 99.8% and 85% with a maximum TOC mineralization efficiency of 37.8% and 24.5% for methylene blue and tetracycline respectively. The enhanced catalytic activity could be attributed to the nano crystallite size, highly exposed {001} facets, ultrathin nanosheet like morphology with a lamellar structure, high-density oxygen vacancies, high specific-surface area, mesoporosity, enhanced visible light absorption with reduced band gap and high charge carrier separation efficiency with increased life time of charge carriers. The sample was effectively reused five times without losing activity in the successive runs.
Keywords:
Hydrothermal method
Seawater
Photocatalytic mineralization
Sustainable synthesis
Dye sensitization
Oxygen vacancies
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