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). 2021 May;103:172-184. doi: 10.1016/j.jes.2020.10.014. Epub 2020 Nov 16.
To improve the removal capacity of NO + O effectively, the alkaline earth metal-doped order mesoporous carbon (A-C-FDU-15(0.001) (A = Mg, Ca, Sr and Ba)) and Mg-C-FDU-15(x) (x = 0.001-0.003) samples were prepared, and their physicochemical and NO + O adsorption properties were determined by means of various techniques. The results show that the sequence in (NO + O) adsorption performance was as follows: Mg-C-FDU-15(0.001) (93.2 mg/g) > Ca-C-FDU-15(0.001) (82.2 mg/g) > Sr-C-FDU-15(0.001) (76.1 mg/g) > Ba-C-FDU-15(0.001) (72.9 mg/g) > C-FDU-15 (67.1 mg/g). Among all of the A-C-FDU-15(0.001) samples, Mg-C-FDU-15(0.001) possessed the highest (NO + O) adsorption capacity (106.2 mg/g). The species of alkaline earth metals and basic sites were important factors determining the adsorption of NO + O on the A-C-FDU-15(x) samples, and (NO + O) adsorption on the samples was mainly chemical adsorption. Combined with the results of (NO + O)-temperature-programmed desorption ((NO + O)-TPD) and in situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS) characterization, we deduced that there were two main pathways of (NO + O) adsorption: one was first the conversion of NO and O to NO and then part of NO was converted to NO and NO; and the other was the direct oxidation of NO to NO and NO.
为了有效提高 NO+O 的去除能力，制备了碱土金属掺杂的有序介孔碳（A-C-FDU-15(0.001)（A=Mg、Ca、Sr 和 Ba）和 Mg-C-FDU-15(x)（x=0.001-0.003）样品，并通过各种技术确定了它们的物理化学性质和 NO+O 吸附性能。结果表明，（NO+O）吸附性能的顺序如下：Mg-C-FDU-15(0.001)（93.2mg/g）>Ca-C-FDU-15(0.001)（82.2mg/g）>Sr-C-FDU-15(0.001)（76.1mg/g）>Ba-C-FDU-15(0.001)（72.9mg/g）>C-FDU-15（67.1mg/g）。在所有的 A-C-FDU-15(0.001)样品中，Mg-C-FDU-15(0.001)具有最高的（NO+O）吸附容量（106.2mg/g）。碱土金属的种类和碱性位是决定 A-C-FDU-15(x)样品吸附 NO+O 的重要因素，样品对（NO+O）的吸附主要是化学吸附。结合（NO+O）-程序升温脱附（（NO+O）-TPD）和原位漫反射红外傅里叶变换光谱（DRIFTS）的结果，我们推断出（NO+O）吸附有两种主要途径：一种是首先将 NO 和 O 转化为 NO，然后部分 NO 转化为 NO 和 NO；另一种是将 NO 直接氧化为 NO 和 NO。
