In situ fabrication of Mn3O4 decorated graphene oxide as a synergistic catalyst for degradation of methylene blue
In situ fabrication of Mn3O4 decorated graphene oxide as a synergistic catalyst for degradation of methylene blue
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DOI：
10.1016/j.apcatb.2014.06.058
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发表时间：
2015-01-01
影响因子：
22.1
通讯作者：
Sun, Jingchang
中科院分区：
文献类型：
--
作者：
Li, Yuqian;Qu, Jiangying;Sun, Jingchang
本文报道了一种一步法高效合成氧化石墨烯/Mn 3 O 4（GO/Mn 3 O 4）杂化材料的方法，该杂化材料对水中亚甲基蓝（MB）的分解具有上级催化活性。该方法利用通过改进的Hummers方法生产的原始氧化石墨烯/硫酸锰（GO/MnSO 4）悬浮液作为原料，其中GO/MnSO 4已经与KOH和空气组合原位转化为GO/Mn 3 O 4杂化物。该反应具有原子经济性，副产物为K_2SO_4晶体，符合绿色化学标准。对于MB染料的催化降解，在室温下，所制备的GO/Mn 3 O 4催化剂的结果，在H2 O2的辅助下，在反应速率相比，裸Mn 3 O 4颗粒的显着提高。通常，50 mL MB（50 mg L-1）可以100%脱色和77%矿化与10 mg的GO/Mn 3 O 4杂化物。GO/Mn_3O_4杂化物的这种优异的催化性能主要归因于GO、Mn_3O_4、H_2O_2和MB分子的协同作用。羟基自由基实验表明，GO/Mn 3 O 4杂化材料对亚甲基蓝的催化活性与H2 O2产生的活性中心点OH物种的数量密切相关。(C)2014爱思唯尔有限公司版权所有。
Herein we report a one-step approach to the highly efficient synthesis of graphene oxide/Mn3O4 (GO/Mn3O4) hybrids with superior catalytic activities for decomposition of methylene blue (MB) in water. This method exploits the pristine graphene oxide/manganese sulfate (GO/MnSO4) suspension produced by the modified Hummers method as the raw materials, in which GO/MnSO4 has been in situ converted into GO/Mn3O4 hybrid in combination with KOH and air. This atom-economic reaction produces only K2SO4 crystal as the by-product which meets the standard of green chemistry. For catalystic degradation of MB dye at room temperature, the as-prepared GO/Mn3O4 catalysts result in a significant enhancement in the reaction rate compared to that of the bare Mn3O4 particles with the assistance of H2O2. Typically, 50 mL of MB (50 mg L-1) can be 100% decolorized and 77% mineralized with 10 mg of the GO/Mn3O4 hybrid. Such excellent catalytic performance of the GO/Mn3O4 hybrid is mainly attributed to the synergistic effects of GO, Mn3O4, H2O2 and MB molecules. Based on the hydroxyl radical experiments, the catalytic activity of GO/Mn3O4 hybrids for degradation of MB is closely related with the amount of the reactive center dot OH species generated from H2O2. (C) 2014 Elsevier B.V. All rights reserved.