Synthesis of petal-like δ-MnO2 and its catalytic ozonation performance†,New Journal of Chemistry

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Synthesis of petal-like δ-MnO2 and its catalytic ozonation performance†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-03-19 00:00:00 , DOI: 10.1039/c8nj00240a
Kai Luo _{1,

2,

3,

4,

5} , Shi-Xi Zhao _{1,

2,

3,

4} , Yi-Feng Wang _{1,

2,

3,

4,

5} , Shu-Jin Zhao _{1,

2,

3,

4,

5} , Xi-Hui Zhang _{1,

2,

3,

4}

Affiliation

Petal-like δ-MnO₂ microspheres were successfully synthesized by a very simple hydrothermal method with potassium permanganate (KMnO₄) as the only raw material. By adjusting the initial concentration of KMnO₄ solution and the time of the hydrothermal reaction, the morphology and crystallinity of δ-MnO₂ can be controlled. The synthesized δ-MnO₂ microspheres were characterized by XRD, SEM, TEM, TG/DSC, BET, ICP-AES and XPS. The catalytic ozonation performance of δ-MnO₂ prepared by a hydrothermal reaction at 160 °C for 24 h using 0.1 mol L⁻¹ KMnO₄ solution was tested. Its catalytic activity is excellent. The degradation efficiencies of bisphenol A and ibuprofen using 0.1 g L⁻¹ δ-MnO₂ as the catalyst were 68.2% and 68.5% in 20 min reaction time. The results were much better than those of individual ozone treatment and with commercial MnO₂ as the catalyst. The formation of hydroxyl radicals was not the main reason for the rapid degradation of organic compounds in the catalytic reaction with δ-MnO₂ as the catalyst. The strong interaction among the catalyst surface, ozone and organic molecules was the important reason for catalysis based on the related experimental results.

中文翻译：

合成花瓣状δ-的MnO ₂和臭氧催化氧化性能†

花瓣状δ-的MnO _2个微球成功地用高锰酸钾一个非常简单的水热法（合成的KMnO ₄）作为唯一的原料。通过调整的高锰酸钾的初始浓度₄溶液δ-的MnO和水热反应时，形态和结晶度₂可以被控制。合成δ-的MnO ₂用XRD，SEM，TEM，TG / DSC，BET，ICP-AES和XPS的微球进行了表征。δ-的MnO的催化臭氧性能₂使用0.1摩尔L请在160℃下进行水热反应24小时制备^-1的KMnO ₄解决方案进行了测试。它的催化活性极好。双酚A和布洛芬使用0.1克L-降解效率^-1 δ-的MnO ₂作为催化剂分别为68.2％和20分钟反应时间68.5％。结果要好于单独的臭氧处理和以商业MnO ₂为催化剂的结果。羟基自由基的形成不是用于与δ-MnO的催化反应的有机化合物的迅速降解的主要原因₂作为催化剂。根据相关的实验结果，催化剂表面，臭氧和有机分子之间的强相互作用是催化的重要原因。

更新日期：2018-03-19

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