Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China.
Environ Sci Technol. 2013 Aug 20;47(16):9397-403. doi: 10.1021/es401286p. Epub 2013 Aug 12.
Anthropogenic CO2 emission makes significant contribution to global climate change and CO2 capture and storage is a currently a preferred technology to change the trajectory toward irreversible global warming. In this work, we reported a new strategy that the inexhaustible MgCl2 in seawater and the abundantly available biomass waste can be utilized to prepare mesoporous carbon stabilized MgO nanoparticles (mPC-MgO) for CO2 capture. The mPC-MgO showed excellent performance in the CO2 capture process with the maximum capacity of 5.45 mol kg(-1), much higher than many other MgO based CO2 trappers. The CO2 capture capacity of the mPC-MgO material kept almost unchanged in 19-run cyclic reuse, and can be regenerated at low temperature. The mechanism for the CO2 capture by the mPC-MgO was investigated by FTIR and XPS, and the results indicated that the high CO2 capture capacity and the favorable selectivity of the as-prepared materials were mainly attributed to their special structure (i.e., surface area, functional groups, and the MgO NPs). This work would open up a new pathway to slow down global warming as well as resolve the pollution of waste biomass.
人为 CO2 排放对全球气候变化有重大贡献，而 CO2 捕集和封存是改变全球变暖不可逆转趋势的首选技术之一。在这项工作中，我们报告了一种新策略，即利用海水中取之不尽的 MgCl2 和丰富的生物质废物来制备用于 CO2 捕集的介孔碳稳定化 MgO 纳米颗粒（mPC-MgO）。mPC-MgO 在 CO2 捕集过程中表现出优异的性能，最大容量为 5.45 mol kg-1，远高于许多其他基于 MgO 的 CO2 捕获剂。mPC-MgO 材料的 CO2 捕集容量在 19 次循环重复使用中几乎保持不变，并且可以在低温下再生。通过傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）研究了 mPC-MgO 的 CO2 捕集机理，结果表明，所制备材料具有高 CO2 捕集容量和良好的选择性，主要归因于其特殊的结构（即表面积、官能团和 MgO NPs）。这项工作为减缓全球变暖以及解决生物质废物污染开辟了新途径。
