论文部分内容阅读
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)/MnO_2气凝胶,通过SEM、TEM、TGA、XPS和BET对RGO/MnO_2气凝胶的形态结构及性能进行了表征,并研究了RGO/MnO_2气凝胶对甲醛的去除能力。结果表明:在RGO/MnO_2气凝胶的前驱体中,氧化石墨烯(GO)为单层二维纳米材料;MnO_2气凝胶由MnO_2纳米线组成,MnO_2纳米线的直径在40nm左右,长度达5μm以上,且属于隐钾锰矿型结构。RGO/MnO_2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MnO_2纳米线组成的,RGO将MnO_2纳米线隔开,起到隔板的作用,使MnO_2纳米线在RGO中均匀分布。RGO/MnO_2气凝胶在100℃以下具有良好的热学稳定性。RGO/MnO_2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MnO_2气凝胶相比,相同条件下RGO/MnO_2气凝胶对甲醛的去除率提高了30.0%,证实RGO有助于提高MnO_2对甲醛的去除能力。
In order to prepare new efficient formaldehyde removal materials, RGO / MnO 2 airgel was prepared by hydrothermal method. The morphological structure and properties of RGO / MnO 2 airgel were investigated by SEM, TEM, TGA, XPS and BET. The characterization and the removal of formaldehyde by RGO / MnO 2 aerogels were studied. The results show that graphene oxide (GO) is a single-layer two-dimensional nanomaterial in the precursor of RGO / MnO_2 aerogels, MnO_2 aerogels are composed of MnO_2 nanowires, and the diameter of MnO_2 nanowires is about 40 nm, 5μm or more, and belongs to the cryptomelane structure. RGO / MnO 2 airgel is a three-dimensional porous material composed of sheet materials consisting of uniformly distributed RGO nanosheets and MnO 2 nanowires. The RGO separates MnO 2 nanowires from To the role of the separator, the MnO 2 nanowires are uniformly distributed in the RGO. RGO / MnO 2 airgel has good thermal stability below 100 ℃. The removal efficiency of RGO / MnO 2 aerogels for low concentration of formaldehyde was 62.5%. Compared with MnO 2 aerogels, RGO / MnO 2 aerogels improved the formaldehyde removal efficiency by 30.0% under the same conditions, It was confirmed that RGO can improve the removal of formaldehyde by MnO 2.