Graphene Oxide as Support for Layered Double Hydroxides: Enhancing the CO2 Adsorption Capacity
Graphene Oxide as Support for Layered Double Hydroxides: Enhancing the CO2 Adsorption Capacity
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DOI：
10.1021/cm3018264
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发表时间：
2012-12-11
影响因子：
8.6
通讯作者：
Shaffer, Milo S. P.
中科院分区：
文献类型：
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作者：
Garcia-Gallastegui, Ainara;Iruretagoyena, Diana;Shaffer, Milo S. P.
层状双氢氧化物（LDHs）作为CO2吸附材料显示出巨大的潜力，但需要提高其稳定性和CO2吸附能力以实现商业应用。在目前的研究中，氧化石墨烯提供了一种重量轻、电荷互补的二维（2D）材料，可与2D LDH有效相互作用，进而增强组装体的CO2吸收能力和多晶稳定性。结果，仅使用7重量%的氧化石墨烯（GO）作为载体，LDH的绝对容量增加了62%。用于合成材料的实验程序是基于LDH纳米颗粒直接沉淀到GO上，然后通过电子显微镜、X射线衍射、热重分析和Brunauer-Emmett-Teller（BET）表面积测量进行结构和物理表征。详细的滴定证实了表面化学的相容性。在热分解之后，获得具有CO2吸附所需的碱性位点的混合金属氧化物（MMO）。制备了一系列具有不同比例的GO/MMO的样品，充分表征，并与通过TGA建立的CO2吸附能力相关。
Layered double hydroxides (LDHs) show great potential as CO2 adsorbent materials, but require improvements in stability and CO2 adsorption capacity for commercial applications. In the current study, graphene oxide provides a light-weight, charge-complementary, two-dimensional (2D) material that interacts effectively with the 2D LDHs, in turn enhancing the CO2 uptake capacity and multicycle stability of the assembly. As a result, the absolute capacity of the LDH was increased by 62% using only 7 wt % graphene oxide (GO) as a support. The experimental procedure for the synthesis of the materials is based on a direct precipitation of the LDH nanoparticles onto GO followed by a structural and physical characterization by electron microscopy, X-ray diffraction, thermogravimetric analysis, and Brunauer-Emmett-Teller (BET) surface area measurements. Detailed titration confirmed the compatibility of the surface chemistry. After thermal decomposition, mixed metal oxides (MMOs) are obtained with the basic sites required for the CO2 adsorption. A range of samples with different proportions of GO/MMO were prepared, fully characterized, and correlated with the CO2 sorption capacity, established via TGA.