Preparation and characterization of mesoporous ZnO-ZrO2 doped by Cr, Nd and Dy as a catalyst for conversion of coumarin using ultrasensitive fluorometric method

被引：6
作者：
Ibrahim, M. M. [1 ]
机构：
[1] Ain Shams Univ, Fac Educ, Dept Chem, Cairo 11711, Egypt
来源：
SOLID STATE SCIENCES | 2017年 / 66卷
关键词：
Nanostructures; Mesoporous; Surface area; Photoelectron spectroscopy; Optical properties; Fluorometric method; HYDROGEN-PEROXIDE; PHOTOCATALYTIC ACTIVITY; H2O2; DECOMPOSITION; OPTICAL-PROPERTIES; THIN-FILMS; OXIDATION; SURFACE; DEGRADATION; SOL; NANOPARTICLES;
D O I：
10.1016/j.solidstatesciences.2017.02.006
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Doping of mesoporous ZnO-ZrO2 nanoparticles with transition metal and lanthanides (Cr, Nd, Dy) were used as a catalyst to develop an ultrasensitive fluorometric method for the conversion of non fluorescent coumarin to highly fluorescent 7-hydroxycoumarin using H2O2 or light. It was found that doped- Zno-ZrO2 mixed oxide can catalyze the decomposition of H2O2 to produce (OH)-O-center dot radicals, which in turn convert coumarin to 7-hydroxycoumarin. At contrast, the doping has deleterious effect on conversion of coumarin by light due to high band gap and high concentrations of doping increase the recombination rate of electron and holes. Doped mixed oxides prepared by impregnation method and characterized by studying their structural, surface and optical properties. Chromium doped ZnO-ZrO2 had the highest rate of formation of hydroxyl radical due to decomposition of H2O2 and therefore 7-hydroxycoumarin due to surface area, small crystal size and high redox potential. (C) 2017 Elsevier Masson SAS. All rights reserved.
引用
收藏
页码：23 / 30
页数：8
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