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5μm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.
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