首页> 外文期刊>Chemistry: A European journal >Branched mesoporous Mn _3O _4 nanorods: Facile synthesis and catalysis in the degradation of methylene blue
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Branched mesoporous Mn _3O _4 nanorods: Facile synthesis and catalysis in the degradation of methylene blue

机译:支链介孔Mn _3O _4纳米棒:亚甲基蓝降解中的简便合成和催化

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摘要

Branched MnOOH nanorods with diameters in the range of 50-150 nm and lengths of up to tens of micrometers were prepared by using potassium permanganate (KMnO _4) and PEG 400 (PEG=polyethylene glycol) as starting materials through a simple hydrothermal process at 160 °C. After annealing at 300 °C under a N _2 atmosphere for 5 h, MnOOH nanorods became gradually dehydrated and transformed into mesoporous Mn _3O _4 nanorods with a slight size-shrinking. The as-obtained mesoporous Mn _3O _4 nanorods had an average surface area of 32.88 m ~2 g ~(-1) and a mean pore size of 3.7 nm. Through tuning the experimental parameters, such as the annealing atmosphere and temperature, β-MnO _2, Mn _2O _3, Mn _3O _4, MnO, and Mn _5O _8 were selectively produced. Among these structures, mesoporous Mn _3O _4 nanorods were efficient for the catalytic degradation of methylene blue (MB) in the presence of H _2O _2 at 80 °C.
机译:通过使用高锰酸钾(KMnO _4)和PEG 400(PEG =聚乙二醇)作为起始原料,通过简单的水热工艺在160处制备了直径在50-150 nm范围内且长度高达数十微米的MnOOH支化纳米棒。 ℃。在N _2气氛下于300°C退火5 h后,MnOOH纳米棒逐渐脱水并转变为介孔Mn _3O _4纳米棒,且尺寸略有缩小。所得的介孔Mn _3O _4纳米棒的平均表面积为32.88 m〜2 g〜(-1),平均孔径为3.7 nm。通过调整退火气氛和温度等实验参数,有选择地生产了β-MnO_2,Mn _2O _3,Mn _3O _4,MnO和Mn _5O _8。在这些结构中,中孔的Mn _3O _4纳米棒可在80°C的H _2O _2存在下有效催化亚甲基蓝(MB)的催化降解。

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