Hierarchical NiMn2O4/rGO composite nanosheets decorated with Pt for low-temperature formaldehyde oxidation
Hierarchical NiMn2O4/rGO composite nanosheets decorated with Pt for low-temperature formaldehyde oxidation
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Pt修饰的多级NiMn2O4/rGO复合纳米片用于低温甲醛氧化
DOI：
10.1039/c9en00652d
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发表时间：
2020-01-01
影响因子：
7.3
通讯作者：
Yu, Jiaguo
中科院分区：
文献类型：
--
作者：
Wang, Yuanyuan;Ye, Jiawei;Yu, Jiaguo
甲醛(HCHO)是影响室内空气质量的主要污染物。接触甲醛会对人体健康造成严重危害，消除室内甲醛已成为当务之急。催化氧化法因其高效、简便等优点而被认为是最理想的方法。本文采用水热法制备了尖晶石型镍锰复合氧化物(NiMn2O4)和还原石墨烯氧化物(RGO)的层状纳米复合材料，并采用浸渍-化学还原法制备了铂(铂)纳米粒子。由于其独特的性能，铂/NiMn2O4/rGO纳米复合材料在室温下表现出更高的甲醛分解活性。层次化结构使其具有丰富的孔道和较大的比表面积，这有利于铂纳米粒子的分散，并有助于产生更多的表面活性中心。X-射线光电子能谱分析表明，组分之间的相互作用也是获得优异催化性能的重要因素，组分之间的电子转移促进了表面氧物种和吸附氧分子的活化。用原位漫反射红外傅里叶变换光谱对氧化机理进行了研究，结果表明，氧化过程中的主要中间体是二甲醛和甲酸盐物种。这项研究表明，氧化硅和过渡金属氧化物纳米片的纳米复合材料是一种潜在的室内空气净化材料。
Formaldehyde (HCHO) is a major pollutant affecting indoor air quality. Exposure to HCHO would cause serious health risks to humans, so it is an urgent issue to remove indoor HCHO. Catalytic oxidation is deemed to be the optimal method because of its efficiency and convenience. Herein, a hierarchical nanocomposite of spinel nickel–manganese mixed oxide (NiMn2O4) and reduced graphene oxide (rGO) was synthesized by a facile hydrothermal process, and platinum (Pt) nanoparticles were subsequently deposited by an impregnation–chemical reduction procedure. The Pt/NiMn2O4/rGO nanocomposite exhibited enhanced HCHO decomposition activity at room temperature, owing to its unique features. The hierarchical structure endows it with abundant pores and a large specific surface area, which favors the dispersion of Pt nanoparticles and contributes to more surface active sites. As revealed by X-ray photoelectron spectroscopy analysis, the interactions between components were also important factors for achieving the excellent catalytic performance, in that electron transfer between the components could promote the activation of surface oxygen species and adsorbed oxygen molecules. In situ diffuse reflectance infrared Fourier transform spectroscopy was performed to explore the oxidation mechanism, and the results showed that the major intermediates in the oxidation process were dioxymethylene and formate species. This study indicates that nanocomposites of rGO and transition metal oxide nanosheets are potential materials for efficient indoor air purification.