TY - JOUR

T1 - Highly Selective Photocatalytic Reduction of o-Dinitrobenzene to o-Phenylenediamine over Non-Metal-Doped TiO2 under Simulated Solar Light Irradiation

AU - El-Hosainy, Hamza M.

AU - El-Sheikh, Said M.

AU - Ismail, Adel A.

AU - Hakki, Amer

AU - Dillert, Ralf

AU - Killa, Hamada M.

AU - Ibrahim, Ibrahim A.

AU - Bahnemann, Detlef Bahnemann Detlef

N1 - Funding information: This work was supported by short cycle 5, Science & Technology Development Fund in Egypt (STDF fellowship) under Grant no. ID 12282. Acknowledgments: This work was supported by short cycle 5, Science & Technology Development Fund in Egypt (STDF fellowship) under Grant no. ID 12282. H. El-Hosainy acknowledges Institut für Technische Chemie, Leibniz Universität Hannover, Germany for hosting him during the current research work. The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover.

PY - 2018/12

Y1 - 2018/12

N2 - Photocatalytic reduction and hydrogenation reaction of o-dinitrobenzene in the presence of oxalic acid over anatase-brookite biphasic TiO 2 and non-metal-doped anatase-brookite biphasic TiO 2 photocatalysts under solar simulated light was investigated. Compared with commercial P25 TiO 2, the prepared un-doped and doped anatase-brookite biphasic TiO 2 exhibited a high selectivity towards the formation of o-nitroaniline (85.5%) and o-phenylenediamine ~97%, respectively. The doped anatase-brookite biphasic TiO 2 has promoted photocatalytic reduction of the two-nitro groups of o-dinitrobenzene to the corresponding o-phenylenediamine with very high yield ~97%. Electron paramagnetic resonance analysis, Transient Absorption Spectroscopy (TAS) and Photoluminescence analysis (PL) were performed to determine the distribution of defects and the fluorescence lifetime of the charge carriers for un-doped and doped photocatalysts. The superiority of the doped TiO 2 photocatalysts is accredited to the creation of new dopants (C, N, and S) as hole traps, the formation of long-lived Ti 3+ defects which leads to an increase in the fluorescence lifetime of the formed charge carriers. The schematic diagram of the photocatalytic reduction of o-dinitrobenzene using the doped TiO 2 under solar light was also illustrated in detail.

AB - Photocatalytic reduction and hydrogenation reaction of o-dinitrobenzene in the presence of oxalic acid over anatase-brookite biphasic TiO 2 and non-metal-doped anatase-brookite biphasic TiO 2 photocatalysts under solar simulated light was investigated. Compared with commercial P25 TiO 2, the prepared un-doped and doped anatase-brookite biphasic TiO 2 exhibited a high selectivity towards the formation of o-nitroaniline (85.5%) and o-phenylenediamine ~97%, respectively. The doped anatase-brookite biphasic TiO 2 has promoted photocatalytic reduction of the two-nitro groups of o-dinitrobenzene to the corresponding o-phenylenediamine with very high yield ~97%. Electron paramagnetic resonance analysis, Transient Absorption Spectroscopy (TAS) and Photoluminescence analysis (PL) were performed to determine the distribution of defects and the fluorescence lifetime of the charge carriers for un-doped and doped photocatalysts. The superiority of the doped TiO 2 photocatalysts is accredited to the creation of new dopants (C, N, and S) as hole traps, the formation of long-lived Ti 3+ defects which leads to an increase in the fluorescence lifetime of the formed charge carriers. The schematic diagram of the photocatalytic reduction of o-dinitrobenzene using the doped TiO 2 under solar light was also illustrated in detail.

KW - Nitroaromatic compounds

KW - Non-metal-doped TiO

KW - Photocatalysis

KW - Reduction

KW - Selectivity

UR - http://www.scopus.com/inward/record.url?scp=85060875200&partnerID=8YFLogxK

U2 - 10.3390/catal8120641

DO - 10.3390/catal8120641

M3 - Article

VL - 8

JO - CATALYSTS

JF - CATALYSTS

SN - 2073-4344

IS - 12

M1 - 641

ER -