Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
J Environ Sci (China). 2020 Dec;98:109-117. doi: 10.1016/j.jes.2020.05.025. Epub 2020 Jun 17.
The Al-pillared montmorillonite-supported alkaline earth metal 5M/Al-PILC (PILC = pillared clay, M = Mg, Ca, Sr, and Ba) and xMg/Al-PILC (x = 1, 3, 5, and 7 wt.%) samples were prepared using an impregnation method. Physical properties of the materials were determined by means of X-ray diffraction (XRD) and N adsorption-desorption, and their CO adsorption behaviors were investigated using the thermogravimetric analyzer (TG), CO temperature-programmed desorption (CO-TPD), and in situ diffuse reflectance infrared transform spectroscopy (in situ-DRIFTS) techniques. It is shown that 5Mg/Al-PILC possessed the highest CO adsorption capacity (2.559 mmol/g). The characterization results indicate that Al-pillaring increased the specific surface area of montmorillonite, which was beneficial for the adsorption of CO. The CO adsorption process on the sample was mainly chemical adsorption, and alkalinity was the main factor influencing its adsorption capacity. The alkalinity of the sample was enhanced by loading an appropriate amount of alkaline earth metal, and the adsorbed CO was present in the form of bicarbonate and carbonate. In addition, the 5Mg/Al-PILC sample exhibited an excellent regeneration efficiency. We believe that the outcome of this research would provide a good option for developing highly effective CO adsorption materials.
采用浸渍法制备了 Al 柱撑蒙脱石负载的碱土金属 5M/Al-PILC（PILC=柱撑粘土，M=Mg、Ca、Sr 和 Ba）和 xMg/Al-PILC（x=1、3、5 和 7wt.%）样品。通过 X 射线衍射（XRD）和 N 吸附-脱附测定了材料的物理性质，并采用热重分析仪（TG）、CO 程序升温脱附（CO-TPD）和原位漫反射红外变换光谱（in situ-DRIFTS）技术研究了它们的 CO 吸附行为。结果表明，5Mg/Al-PILC 具有最高的 CO 吸附容量（2.559mmol/g）。表征结果表明，Al 柱撑增加了蒙脱石的比表面积，有利于 CO 的吸附。样品上的 CO 吸附过程主要是化学吸附，碱度是影响其吸附容量的主要因素。通过负载适量的碱土金属可以增强样品的碱度，吸附的 CO 以碳酸氢盐和碳酸盐的形式存在。此外，5Mg/Al-PILC 样品表现出优异的再生效率。我们相信，这项研究的结果将为开发高效 CO 吸附材料提供一个很好的选择。
