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On the origin of the oxidizing ability of ceria nanoparticles

机译:二氧化铈纳米颗粒氧化能力的起源

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To better understand the oxidizing ability of ceria nanoparticles (nanoceria), the influences of protons, dissolved oxygen (DO), superoxide dismutase (SOD) and catalase on the oxidation of organic dyes in an aqueous suspension of rod-like nanoceria were investigated in detail. The strong oxidizing ability of nanoceria was verified. Electron paramagnetic resonance (EPR) results revealed the existence of superoxide anion radicals (O-center dot(2)-) and hydroxyl radicals (cOH) in the nanoceria suspension without additional hydrogen peroxide (H2O2). A reasonable origin of the oxidizing ability of nanoceria was hypothesized: the adsorbed O-center dot(2)- on the nanoceria surface can dismutate to H2O2 via the SOD-mimetic activity of nanoceria, and then, the cOH are produced through a Fenton-like reaction. This process is inherent and pH-dependent. The regeneration of O-center dot(2)- and persistent production of cOH can be realized by including DO in an aqueous solution. Moreover, we found that the Ce4+ in nanoceria could also directly act as an oxidant at low pH values.
机译:为了更好地理解二氧化铈纳米颗粒(nanoceria)的氧化能力,详细研究了质子,溶解氧(DO),超氧化物歧化酶(SOD)和过氧化氢酶对棒状纳米氧化铈水悬浮液中有机染料氧化的影响。 。证实了纳米氧化铈的强氧化能力。电子顺磁共振(EPR)结果表明,纳米氧化铈悬浮液中存在超氧阴离子自由基(O-中心点(2)-)和羟基自由基(cOH),而无额外的过氧化氢(H2O2)。推测了纳米氧化铈氧化能力的合理来源:纳米氧化铈表面吸附的O中心点(2)-可以通过纳米氧化铈的SOD模仿活性转变为H2O2,然后通过Fenton-喜欢反应。该过程是固有的并且依赖于pH。通过在水溶液中加入DO可以实现O中心点(2)的再生和cOH的持续生成。此外,我们发现纳米氧化铈中的Ce4 +在低pH值下也可以直接充当氧化剂。

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