State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
J Environ Sci (China). 2013 Jan 1;25(1):124-32. doi: 10.1016/s1001-0742(12)60011-4.
A high efficiency sorbent for CO2 capture was developed by loading polyethylenimine (PEI) on mesoporous carbons which possessed well-developed mesoporous structures and large pore volume. The physicochemical properties of the sorbent were characterized by N2 adsorption/desorption, scanning electron microscopy (SEM), thermal gravimetric analysis (TG) and Fourier transform infrared spectroscopy (FT-IR) techniques followed by testing for CO2 capture. Factors that affected the sorption capacity of the sorbent were studied. The sorbent exhibited extraordinary capture capacity with CO2 concentration ranging from 5% to 80%. The optimal PEI loading was determined to be 65 wt.% with a CO2 sorption capacity of 4.82 mmol-CO2/g-sorbent in 15% CO2/N2 at 75 degrees C, owing to low mass-transfer resistance and a high utilization ratio of the amine compound (63%). Moisture had a promoting effect on the sorption separation of CO2. In addition, the developed sorbent could be regenerated easily at 100 degrees C, and it exhibited excellent regenerability and stability. These results indicate that this PEI-loaded mesoporous carbon sorbent should have a good potential for CO2 capture in the future.
一种高效的 CO2 捕获吸附剂是通过将聚乙烯亚胺（PEI）负载在具有发达介孔结构和大孔体积的介孔碳上来制备的。采用 N2 吸附/解吸、扫描电子显微镜（SEM）、热重分析（TG）和傅里叶变换红外光谱（FT-IR）等技术对吸附剂的物理化学性质进行了表征，并对 CO2 的捕获性能进行了测试。研究了影响吸附剂吸附容量的因素。该吸附剂在 CO2 浓度为 5%至 80%的范围内表现出非凡的捕获能力。在 75°C、15% CO2/N2 条件下，当 PEI 负载量为 65wt.%时，CO2 吸附容量为 4.82mmol-CO2/g-吸附剂，这归因于低传质阻力和高胺化合物利用率（63%）。水分对 CO2 的吸附分离具有促进作用。此外，所开发的吸附剂在 100°C 下容易再生，且具有优异的再生性和稳定性。这些结果表明，这种负载型介孔碳吸附剂在未来的 CO2 捕获中具有良好的应用前景。
