Three-dimensional（3D）ordered mesoporous MnO2 was prepared using KIT-6 mesoporous molecular sieves as a hard *** material was used for catalytic oxidation of *** material has high surface areas and the mesoporous cha...
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Three-dimensional（3D）ordered mesoporous MnO2 was prepared using KIT-6 mesoporous molecular sieves as a hard *** material was used for catalytic oxidation of *** material has high surface areas and the mesoporous characteristics of the template,with cubic symmetry（ia3d）.It consists of a β-MnO2 crystalline phase corresponding to pyrolusite,with a rutile *** electron microscopy and X-ray photoelectron spectroscopy showed that the 3D-MnO2 catalyst has a large number of exposed Mn4＋ ions on the（110）crystal plane surfaces,with a lattice spacing of 0.311 nm; this enhances oxidation of *** conversion of HCHO to CO2 and H2O was achieved at 130 °C on 3D-MnO2; the same conversions on α-MnO2 and β-MnO2 nanorods were obtained at 140 and 180 °C,respectively,under the same *** specific mesoporous structure,high specific surface area,and large number of surface Mn4＋ ions are responsible for the catalytic activity of 3D-MnO2 in HCHO oxidation.
为了保障再生水水质生物稳定性,控制再生水在储存、输配和利用过程中微生物生长,对再生水臭氧氧化处理工艺水质生物稳定性进行了研究。研究发现,臭氧氧化对再生水厂二级出水的溶解性有机碳（DOC）去除效果有限,对UV254和荧光强度有较好的去除效果,但可导致水样AOC水平升高,水质生物稳定性降低。分析臭氧氧化后不同有机物组分的变化情况,发现臭氧氧化对分子量为0.5~20 k Da有机物有较好的去除效果,而分子量小于0.5 k Da有机物没有明显变化。
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