Photocatalytic reduction of Cr(VI) using star-shaped Bi2S3 obtained from microwave irradiation of bismuth complex
| Autor: | Opeyemi A. Oyewo, Olusola Ojelere, Damian C. Onwudiwe, Ufuk Atamtürk, Sanjay Mathur |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Aqueous solution
Materials science Scanning electron microscope Process Chemistry and Technology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Bismuth Chromium chemistry.chemical_compound chemistry Transmission electron microscopy Specific surface area Photocatalysis Chemical Engineering (miscellaneous) Hexavalent chromium 0210 nano-technology Waste Management and Disposal 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Journal of Environmental Chemical Engineering. 8:103816 |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2020.103816 |
| Popis: | The reduction of hexavalent chromium specie, Cr(VI), to trivalent chromium, Cr(III), in aqueous solutions using star-shaped nanostructured Bi2S3, prepared via a facile microwave irradiation of bismuth dithiocarbamate complex is reported. The bismuth sulphide were characterized using X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectrometer (EDX). The study showed that Cr( VI ) reduction was dependent on its initial concentration, the pH value of the solution, and the Bi2S3 dosage. Almost all the Cr( VI ) in a concentration of 2 ppm and at pH 2 was reduced within 90 min by the addition of 100 mg L−1of the Bi2S3. The reduction capacity of the nanostructure was attributed to photocatalytic-induced reduction process as well as the high specific surface area. Pseudo-first order kinetics model parameters well described the Cr( VI ) reduction experimental data with high correlation factor of 0.998. This study demonstrates that microwave irradiation of precursor complex could offer a quick and facile route to nanostructured photocatalyst, which are good candidate material for the removal of trace chromium in surface water. |
| Databáze: | OpenAIRE |
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