Cu 层状双氢氧化物催化过氧化氢氧化降解乙苯。
Catalysis of hydrogen peroxide with Cu layered double hydrotalcite for the degradation of ethylbenzene.
机构信息
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
Nanjing Institute of Environmental Sciences, Ministry of Ecological Environment, Nanjing, 210042, China.
出版信息
Chemosphere. 2019 Jun;225:157-165. doi: 10.1016/j.chemosphere.2019.02.180. Epub 2019 Feb 27.
A high catalytic system using Cu layered double hydrotalcite (Cu(II)-Mg(II)-Fe(III)LDHs) and hydrogen peroxide (HO) was developed for the degradation of ethylbenzene. It was identified that the degradation efficiency of ethylbenzene (0.08 mmol L) and TOC removal were 96.1% and 39.7% respectively in the presence of 0.1 g L Cu(II)-Mg(II)-Fe(III)LDHs with (Cu + Mg)/Fe molar ratio of 5.0 and 0.16 mmol L HO in 6.0 h. Based on ESR and XPS data, hydroxyl radicals (•OH) were the predominant free radical specials generated from the catalytic decomposition of HO for the degradation of ethylbenzene. The redox of Cu(II)/Cu(III) on the layered Cu(II)-Mg(II)-Fe(III)LDHs surface active sites accounted for the formation of •OH radicals and the cycle of Cu(II) in the Cu(II)-Mg(II)-Fe(III)LDHs/HO system were proposed.
采用铜层状双氢氧化物（Cu(II)-Mg(II)-Fe(III)LDHs）和过氧化氢（HO）的高效催化体系用于降解乙苯。结果表明，在 0.1g/L Cu(II)-Mg(II)-Fe(III)LDHs 存在下，（Cu+Mg）/Fe 摩尔比为 5.0，HO 浓度为 0.16mmol/L，乙苯（0.08mmol/L）的降解效率和总有机碳（TOC）去除率分别为 96.1%和 39.7%，反应 6.0h 即可完成。基于 ESR 和 XPS 数据，HO 催化分解产生的羟基自由基（•OH）是降解乙苯的主要自由基。Cu(II)-Mg(II)-Fe(III)LDHs 表面活性位上的 Cu(II)/Cu(III)氧化还原反应生成了•OH 自由基，提出了 Cu(II)-Mg(II)-Fe(III)LDHs/HO 体系中 Cu(II)的循环过程。
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