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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Fellahi, Ouarda Szunerits, Sabine Boukherroub, Rabah Barras, Alexandre Pan, Guo-Hui Coffinier, Yannick Hadjersi, Toufik Maamache, Mustapha |
| Description | Country affiliation: Algeria Author Affiliation: Fellahi O ( Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR CNRS 8520, Avenue Poincaré-BP 70478, 59652 Villeneuve d'Ascq Cedex, France); Barras A ( Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR CNRS 8520, Avenue Poincaré-BP 70478, 59652 Villeneuve d'Ascq Cedex, France.); Pan GH ( State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Dong Nanhu Road, Changchun 130033, China.); Coffinier Y ( Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR CNRS 8520, Avenue Poincaré-BP 70478, 59652 Villeneuve d'Ascq Cedex, France.); Hadjersi T ( Centre de Recherche en Technologie des Semi-conducteurs pour l'Energétique-CRTSE 02, Bd Frantz Fanon, BP. 140, Alger 7 Merveilles, Algeria.); Maamache M ( Laboratoire de Physique Quantique et Systèmes Dynamiques, Département de Physique, Université de Sétif, Sétif 19000, Algeria.); Szunerits S ( Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR CNRS 8520, Avenue Poincaré-BP 70478, 59652 Villeneuve d'Ascq Cedex, France.); Boukherroub R ( Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR CNRS 8520, Avenue Poincaré-BP 70478, 59652 Villeneuve d'Ascq Cedex, France. Electronic address: rabah.boukherroub@iemn.univ-lille1.fr.) |
| Abstract | We report an efficient visible light-induced reduction of hexavalent chromium Cr(VI) to trivalent Cr(III) by direct illumination of an aqueous solution of potassium dichromate (K2Cr2O7) in the presence of hydrogenated silicon nanowires (H-SiNWs) or silicon nanowires decorated with copper nanoparticles (Cu NPs-SiNWs) as photocatalyst. The SiNW arrays investigated in this study were prepared by chemical etching of crystalline silicon in HF/AgNO3 aqueous solution. The Cu NPs were deposited on SiNW arrays via electroless deposition technique. Visible light irradiation of an aqueous solution of K2Cr2O7 (10(-4)M) in presence of H-SiNWs showed that these substrates were not efficient for Cr(VI) reduction. The reduction efficiency achieved was less than 10% after 120 min irradiation at λ>420 nm. Addition of organic acids such as citric or adipic acid in the solution accelerated Cr(VI) reduction in a concentration-dependent manner. Interestingly, Cu NPs-SiNWs was found to be a very efficient interface for the reduction of Cr(VI) to Cr(III) in absence of organic acids. Almost a full reduction of Cr(VI) was achieved by direct visible light irradiation for 140 min using this photocatalyst. |
| ISSN | 03043894 |
| Journal | Journal of Hazardous Materials |
| Volume Number | 304 |
| e-ISSN | 18733336 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2016-03-05 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Environmental Science Discipline Environmental Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Pollution Waste Management and Disposal Health, Toxicology and Mutagenesis Environmental Engineering |
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