Synthesis of layered double hydroxides/graphene oxide nanocomposite as a novel high-temperature CO2 adsorbent
Synthesis of layered double hydroxides/graphene oxide nanocomposite as a novel high-temperature CO2 adsorbent
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新型高温CO2吸附剂层状双氢氧化物/氧化石墨烯纳米复合材料的合成
DOI：
10.1016/s2095-4956(15)60293-5
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发表时间：
2015-03-01
影响因子：
13.1
通讯作者：
Wang, Qiang
中科院分区：
文献类型：
--
作者：
Wang, Junya;Mei, Xueyi;Wang, Qiang
在这方面的贡献，一种新型的高温CO2吸附剂组成的Mg-Al层状双氢氧化物（LDH）和氧化石墨烯（GO）纳米片的制备和评价。基于静电驱动带正电荷的Mg-Al LDH单层与带负电荷的GO单层之间的自组装，合成了纳米复合型吸附剂。采用XRD、FE-SEM、HRTEM、FT-IR、BET、TGA等手段对该吸附剂进行了表征。结果表明，GO的加入增强了LDH的分散性和稳定性，提高了LDH的CO2吸附量和多相稳定性。特别是添加6.54wt%的GO作为载体，LDH的绝对CO2捕获能力提高了两倍多。GO似乎对支持LDH片材特别有效。此外，通过掺杂15wt%K2CO3可以进一步提高吸附剂的CO2捕获能力。这项工作展示了一种新的方法，用于制备基于LDH的混合型吸附剂的CO2捕获。
In this contribution, a novel high-temperature CO2 adsorbent consisting of Mg-Al layered double hydroxide (LDH) and graphene oxide (GO) nanosheets was prepared and evaluated. The nanocomposite-type adsorbent was synthesized based on the electrostatically driven self-assembly between positively charged Mg-Al LDH single sheet and negatively charged GO monolayer. The characteristics of this novel adsorbent were investigated using XRD, FE-SEM, HRTEM, FT-IR, BET and TGA. The results showed that both the CO2 adsorption capacity and the multicycle stability of LDH were increased with the addition of GO owing to the enhanced particle dispersion and stabilization. In particular, the absolute CO2 capture capacity of LDH was increased by more than twice by adding 6.54 wt% GO as support. GO appeared to be especially effective for supporting LDH sheets. Moreover, the CO2 capture capacity of the adsorbent could be further increased by doping with 15 wt% K2CO3. This work demonstrated a new approach for the preparation of LDH-based hybrid-type adsorbents for CO2 capture.