Ozone decomposition in water catalyzed by activated carbon:: Influence of chemical and textural properties
Ozone decomposition in water catalyzed by activated carbon:: Influence of chemical and textural properties
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DOI：
10.1021/ie060056n
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发表时间：
2006-04-12
影响因子：
4.2
通讯作者：
Pereira, MFR
中科院分区：
文献类型：
--
作者：
Faria, PCC;Orfäo, JJM;Pereira, MFR
研究了不同表面化学性质和结构性质的活性炭在不存在或不存在的情况下，不同溶液ph下臭氧在水中的分解情况。活性炭在臭氧分解成自由基的过程中起到催化剂的作用，显著加快了这一过程。臭氧的均相分解和非均相分解用二级动力学模型来描述。一般来说，均相和非均相臭氧分解速率都随着溶液ph的增加而增加。活性炭的结构和表面化学特性对臭氧的催化分解起作用。高比表面积、高碱度的活性炭可促进非均相臭氧的分解。尽管活性炭样品在臭氧化过程中经历了轻微的氧化，但没有发生强烈的失活。
The decomposition of ozone in water at different solution pHs in the absence or presence of activated carbons with different surface chemistries and textural properties was investigated. Activated carbon acts as a catalyst in the decomposition of ozone into radical species, significantly accelerating this process. Homogeneous and heterogeneous decomposition of ozone were described by second-order kinetic models. In general, both homogeneous and heterogeneous ozone-decomposition rates increase with solution pH. Textural and surface chemical features of the activated carbon play a role in the catalytic decomposition of ozone. Heterogeneous ozone decomposition is enhanced by activated carbon with high surface area and basicity. Despite the mild oxidation undergone by the activated carbon samples during ozonation, no strong deactivation occurs.