还原氧化石墨烯/MnO2气凝胶对甲醛的去除
In removal of formaldehyde with reduced graphene oxide/MnO2 aerogel

为制备新型高效去除甲醛材料，采用水热法制备了还原氧化石墨烯（RGO）/MnO2气凝胶，通过SEM、TEM、TGA、XPS和BET对RGO/MnO2气凝胶的形态结构及性能进行了表征，并研究了RGO/MnO2气凝胶对甲醛的去除能力。结果表明：在RGO/MnO2气凝胶的前驱体中，氧化石墨烯（GO）为单层二维纳米材料；MnO2气凝胶由MnO2纳米线组成，MnO2纳米线的直径在40 nm左右，长度达5 μm以上，且属于隐钾锰矿型结构。RGO/MnO2气凝胶是一种由片状材料组成的具有三维多孔结构的材料，该片状材料是由均匀分布的RGO纳米片和MnO2纳米线组成的，RGO将MnO2纳米线隔开，起到隔板的作用，使MnO2纳米线在RGO中均匀分布。RGO/MnO2气凝胶在100℃以下具有良好的热学稳定性。RGO/MnO2气凝胶对低浓度甲醛具有较好的去除能力，去除率为62.5%，与MnO2气凝胶相比，相同条件下RGO/MnO2气凝胶对甲醛的去除率提高了30.0%，证实RGO有助于提高MnO2对甲醛的去除能力。 In order to fabricate a novel formaldehyde removal material with high proformance, reduced graphene oxide (RGO)/MnO2 aerogel was fabricated by hydrothermal method. The morphological structures and properties of RGO/MnO2 aerogel were characterized by SEM, TEM, TGA, XPS and BET, and the removal activities of RGO/MnO2 aerogel for formaldehyde were investigated. The results show that among the precursors of RGO/MnO2 aerogel, graphene oxide (GO) is proved to be single-layer two-dimensional nanosheets, MnO2 aerogel consists of MnO2 nanowires, the diameter of MnO2 nanowires is about 40 nm, the length reaches above 5 μm, and belongs to cryptomelane structure. RGO/MnO2 aerogel is a material which have three-dimensional porous structure consists of flake materials, and such flake materials are made of homogeneously dispersed RGO nanosheets and MnO2 nanowires, RGO nanosheets act as clapboards which separate MnO2 nanowires and makes MnO2 nanowires homogeneously dispersed in RGO. RGO/MnO2 aerogel has favorable thermal stability under 100℃. RGO/MnO2 aerogel possesses a preferable removal activity for formaldehyde with low concentration, the removal ratio is 62.5%, the removal rate for formaldehyde of RGO/MnO2 aerogel under the same condition is improved by 30.0% comparing with that of MnO2 aerogel, which proves that RGO is beneficial for enhancing the removal activity of MnO2 for formaldehyde. 国家重点研发计划（2016YFB0303000）；天津市应用基础与前沿计划重点项目（13JCZDJC32100）