Seredych Mykola, Portet Cristelle, Gogotsi Yury, Bandosz Teresa J
Department of Chemistry, The City College of New York, 160 Convent Ave, New York, NY 100031, USA.
J Colloid Interface Sci. 2009 Feb 1;330(1):60-6. doi: 10.1016/j.jcis.2008.10.022. Epub 2008 Oct 17.
Carbide-derived carbons produced from titanium carbide at temperatures from 600 degrees C to 1000 degrees C and exhibiting different porosities were treated with urea in order to introduce nitrogen containing species to their surface. Adsorption of hydrogen sulfide in the dynamic conditions in the presence of moisture was studied on initial and modified samples. The samples, before and after exposure to hydrogen sulfide, were characterized using adsorption of nitrogen, potentiometric titration, elemental analysis, and thermal analysis. The results showed that the introduction of nitrogen significantly enhances the performance of carbons in the process of hydrogen sulfide removal. The amount adsorbed and the degree of oxidation depended on the porosity. On the samples with very small pores, the adsorption was limited, probably owing to the sterical hindrances. With an increase in the size and volume of micropores, in which water and hydrogen sulfide can be accommodated, the efficiency of H(2)S removal by CDC increased.
在600摄氏度至1000摄氏度的温度下由碳化钛制备的、具有不同孔隙率的碳化物衍生碳用尿素进行处理，以便将含氮物种引入其表面。在初始样品和改性样品上研究了在有水分存在的动态条件下硫化氢的吸附情况。利用氮气吸附、电位滴定、元素分析和热分析对暴露于硫化氢前后的样品进行了表征。结果表明，氮的引入显著提高了碳在硫化氢去除过程中的性能。吸附量和氧化程度取决于孔隙率。在孔隙非常小的样品上，吸附受到限制，这可能是由于空间位阻。随着能够容纳水和硫化氢的微孔尺寸和体积的增加，碳化物衍生碳去除H₂S的效率提高。
