Sunlight induced formation of surface Bi2O4-x-Bi2O3 nanocomposite during the photocatalytic mineralization of 2-chloro and 2-nitrophenol

被引：117

作者：

Hameed, Abdul ^{[1
,2
]}

Aslam, Muhammad ^{[1
]}

Ismail, Iqbal M. I. ^{[1
,3
]}

Salah, Numan ^{[4
]}

Fornasiero, Paolo ^{[5
]}

机构：

[1] King Abdulaziz Univ, Ctr Excellence Environm Studies, Jeddah 21589, Saudi Arabia

[2] Quaid i Azam Univ, Natl Ctr Phys, Islamabad 44000, Pakistan

[3] King Abdulaziz Univ, Dept Chem, Fac Sci, Jeddah 21589, Saudi Arabia

[4] King Abdulaziz Univ, Ctr Nanotechnol, Jeddah 21589, Saudi Arabia

[5] Univ Trieste, ICCOM CNR, Dept Chem & Pharmaceut Sci, I-34127 Trieste, Italy

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2015年 / 163卷

关键词：

Sunlight photocatalysis; 2-Nitrophenol degradation; 2-Chlorophenol degradation; Bi2O3 based photocatalyst; OXIDE THIN-FILMS; VISIBLE-LIGHT; SEMICONDUCTOR PHOTOCATALYSIS; ENVIRONMENTAL APPLICATIONS; WATER-PURIFICATION; HYDROGEN-PRODUCTION; BI2O3; DEGRADATION; TIO2; ALPHA-BI2O3;

D O I：

10.1016/j.apcatb.2014.08.029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photocatalytic mineralization of 2-chlorophenol (2-CP) and 2-nitrophenol (2-NP) was investigated using alpha-Bi2O3. The experiments were performed both in complete spectrum and in the visible region (420-800 nm) of the sunlight. The materials were fully characterized by means of UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FESEM). alpha-Bi2O3 showed considerably higher activity for the mineralization of 2-nitrophenol and 2-chlorophenol under natural sunlight exposure, however still appreciable activity was observed in the visible region. Formation of surface nanocomposites Bi2O4-x-Bi2O3 was observed under sunlight irradiation due to the presence of UV light. The sunlight exposed Bi2O3, i.e. Bi2O4-x-Bi2O3 composite, showed excellent activity for the degradation and mineralization of 2-CP and 2-NP in the visible region of sunlight. A key role of both hydroxyl and superoxide anion radicals was evidenced in the degradation and mineralization processes under sunlight while only hydroxyl radicals were identified as major facilitators under visible light irradiation. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：444 / 451

页数：8

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