Zinc Dioxide Nanoparticulates: A Hydrogen Peroxide Source at Moderate pH

被引：83

作者：

Wolanov, Yitzhak ^{[1
]}

Prikhodchenko, Petr V. ^{[2
]}

Medvedev, Alexander G. ^{[1
,2
]}

Pedahzur, Rami ^{[3
]}

Lev, Ovadia ^{[1
]}

机构：

[1] Hebrew Univ Jerusalem, Inst Chem, Casali Ctr Appl Chem, IL-91904 Jerusalem, Israel

[2] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia

[3] Hadassah Acad Coll, Dept Environm Hlth Sci, Jerusalem, Israel

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2013年 / 47卷 / 15期

基金：

俄罗斯基础研究基金会; 新加坡国家研究基金会;

关键词：

CATALYTIC DECOMPOSITION; LABORATORY COLUMN; CALCIUM PEROXIDE; OXYGEN RELEASE; KINETICS; BIOREMEDIATION; REMEDIATION; WATER; ZNO2;

D O I：

10.1021/es4020629

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Solid peroxides are a convenient source of hydrogen peroxide, which once released can be readily converted to active oxygen species or to dissolved dioxygen. A zinc peroxide nanodispersion was synthesized and characterized, and its solubility was determined as a function of pH and temperature. We show that zinc peroxide is much more stable in aqueous solutions compared to calcium and magnesium peroxides and that it retains its peroxide content down to pH 6. At low pH conditions H2O2 release is thermodynamically controlled and its dissolution product, Zn2+, is highly soluble, and thus, hydrogen peroxide release can be highly predictable. The Gibbs free energy of formation of zinc peroxide was found to be -242.0 +/- 0.4 kJ/mol and the enthalpy of formation was -292.1 +/- 0.7 kJ/mol, substantially higher than theoretically predicted before. The biocidal activity of zinc peroxide was determined by inactivation studies with Escherichia coli cultures, and the activity trend agrees well with the thermodynamic predictions.

引用

页码：8769 / 8774

页数：6

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