Photocatalytic degradation of phenol by char/N-TiO2 and char/N-F-TiO2 composite photocatalysts

被引：18

作者：

Antonopoulou, M. ^{[1
]}

Karagianni, P. ^{[1
]}

Giannakas, A. ^{[1
]}

Makrigianni, V. ^{[1
]}

Mouzourakis, E. ^{[2
]}

Deligiannakis, Y. ^{[2
]}

Konstantinou, I. ^{[1
,3
]}

机构：

[1] Univ Patras, Dept Environm & Nat Resources Management, Agrinion 30100, Greece

[2] Univ Ioannina, Dept Phys, GR-45110 Ioannina, Greece

[3] Univ Ioannina, Dept Chem, GR-45110 Ioannina, Greece

来源：

CATALYSIS TODAY | 2017年 / 280卷

关键词：

Pyrolytic char/N-TiO2; Pyrolytic char/N-F-TiO2; Activated char-TiO2; Doping; Composite catalysts; Phenol removal; CO-DOPED TIO2; ACTIVATED CARBONS; ORGANIC POLLUTANTS; AQUEOUS-SOLUTION; PERFORMANCE; ADSORPTION; REDUCTION; OXIDATION; REMOVAL; FILMS;

D O I：

10.1016/j.cattod.2016.03.054

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Pyrolytic char/N-TiO2 (CTN), pyrolytic char/N-F-TiO2 (CTNF) and activated pyrolytic char-TiO2 (ACT) composite catalysts have been successfully prepared by a sol-gel method. TiO2 anatase was the major phase formed in all doped catalysts with a small fraction of brookite phase observed for CTN and ACT. UV-vis diffuse reflectance spectroscopy showed a decrease of band gap energy for all doped CTN and CTNF catalysts. The photocatalytic activity of the studied photocatalysts was systematically investigated under visible light and simulated solar light irradiation, by monitoring the degradation of phenol in aqueous suspensions. CTN and CTNF catalysts showed a better photocatalytic efficiency compared to ACT catalysts. The CTNF composite with a ratio of [pyrolytic char]/[N-F-TiO2] = 0.2/2 was found to be the most effective catalyst for phenol removal. According to our results, the pyrolytic char presented favorable adsorption characteristics for phenol and acts as an electron-acceptor from doped-TiO2 particles resulting in decreased e(-) h(+) pair recombination and subsequently in enhanced production of HO center dot. Moreover, it was revealed that N-F modification promotes the e- separation in TiO2 concomitantly with an enhancement in the visible spectral absorbance. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：114 / 121

页数：8

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