Properties of calcium peroxide for release of hydrogen peroxide and oxygen: A kinetics study
Properties of calcium peroxide for release of hydrogen peroxide and oxygen: A kinetics study
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过氧化钙释放过氧化氢和氧气的特性：动力学研究
DOI：
10.1016/j.cej.2016.05.123
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发表时间：
2016-11-01
影响因子：
15.1
通讯作者：
Qin, Chuanyu
中科院分区：
文献类型：
--
作者：
Wang, Hefei;Zhao, Yongsheng;Qin, Chuanyu
过氧化钙（CaO 2）作为一种固体过氧化物，因其能释放氧气（O-2）和过氧化氢（H2 O2）而被越来越多地应用于污染场地的修复。O-2的存在可以促进生物降解。过氧化氢可以通过改性芬顿进行原位化学氧化。以往的研究表明，不一致的结果，O-2和H2 O2的释放过程中CaO 2分解。通过一系列间歇实验研究了CaO 2的分解特性以及O-2和H2 O2的释放动力学。O-2和H2 O2直接从CaO 2溶解中释放出来，H2 O2不是CaO 2转化为O-2的必要中间体。这两条释放途径形成了一个平行的反应体系，两条途径之间存在竞争关系。H2 O2和O-2的释放分别符合准零级动力学模型和准一级动力学模型。升高温度和降低pH值均可加速O-2和H2 O2的释放速率。然而，升高温度会降低H2 O2产量并增加O-2产量，这与升高pH值的影响相似。（C）2016 Elsevier B. V.保留所有权利。
Calcium peroxide (CaO2), as one of the solid peroxides, has been increasingly used in contaminated site remediation due to its ability to release oxygen (O-2) and hydrogen peroxide (H2O2). Biodegradation can be enhanced by the existence of O-2. Hydrogen peroxide can be used to for in situ chemical oxidation via the modified Fenton. Previous studies show inconsistent results about O-2 and H2O2 release during CaO2 decomposition. Additionally, the release characteristics of 02 and H2O2 are not evaluated in detail.A series of batch experiments was conducted to investigate the properties of CaO2 decomposition and the release kinetics of O-2 and H2O2. O-2 and H2O2 were released directly from CaO2 dissolution and H2O2 was not an essential intermediate in the conversion of CaO2 to O-2. The two release paths formed a parallel reaction system, with a competitive relationship between the two paths. The release of H2O2 and O-2 followed a pseudo-zero-order kinetics pattern and a pseudo-first-order kinetics pattern, respectively. Increasing temperature and decreasing pH could accelerate both O-2 and H2O2 release rate. However, increasing temperature could decrease the H2O2 yield and increase the O-2 yield, which were similar to the impact of increasing pH. (C) 2016 Elsevier B.V. All rights reserved.