The effect of humic acid binding to magnetite nanoparticles on the photogeneration of reactive oxygen species

被引：47

作者：

Carlos, Luciano ^{[1
]}

Cipollone, Mariano ^{[2
]}

Soria, Delia B. ^{[3
]}

Moreno, M. Sergio ^{[4
]}

Ogilby, Peter R. ^{[5
]}

Einschlag, Fernando S. Garcia ^{[1
]}

Martire, Daniel O. ^{[1
]}

机构：

[1] Univ Nacl La Plata, Inst Invest Fis Quim Teor & Aplicadas INIFTA, CCT La Plata CONICET, La Plata, Buenos Aires, Argentina

[2] YPF Ensenada, Ctr Tecnol Argentina, La Plata, Buenos Aires, Argentina

[3] Univ Nacl La Plata, Fac Ciencias Exactas, Ctr Quim Inorgan, La Plata, Buenos Aires, Argentina

[4] Ctr Atom Bariloche CNEA, San Carlos De Bariloche, Rio Negro, Argentina

[5] Univ Aarhus, COMI, Dept Chem, Aarhus, Denmark

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2012年 / 91卷

基金：

新加坡国家研究基金会;

关键词：

Reactive oxygen species; Humic acids; Magnetite nanoparticles; Singlet oxygen; IRON-OXIDE NANOPARTICLES; NATURAL ORGANIC-MATTER; SINGLET OXYGEN; QUANTUM YIELDS; PHOTOSENSITIZED DEGRADATION; MOLECULAR-OXYGEN; HEAVY-METALS; REMOVAL; STABILIZATION; SUBSTANCES;

D O I：

10.1016/j.seppur.2011.08.028

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The goal of this study was to investigate how the binding of humic acids (HA) to magnetite nanoparticles affects the ability of the HA to generate reactive oxygen species (ROS) upon irradiation. To this end, magnetite nanoparticles coated with two different HA were prepared by the co-precipitation method. These particles were characterized by several techniques. The nanoparticle-sensitized quantum yield of singlet oxygen generation (Phi(Delta)) at lambda(exc) = 400 nm and the quantum efficiencies (lambda(exc) = 300-550 nm) of hydroxyl radical and hydrogen peroxide generation were measured and compared to the corresponding quantum yields obtained from solutions of the free HA. Despite being bonded to the magnetite nanoparticles, the HA are still able to generate ROS upon irradiation. As with free HA, the yields of ROS generation by the magnetite-bonded HA depend on the particular HA involved. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：23 / 29

页数：7

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