Mabayoje Oluwaniyi, Seredych Mykola, Bandosz Teresa J
The City College of New York, Department of Chemistry, New York, NY 10031, USA.
J Colloid Interface Sci. 2012 Jul 15;378(1):1-9. doi: 10.1016/j.jcis.2012.04.007. Epub 2012 Apr 16.
Composites of cobalt (hydr)oxide and graphite oxide (GO) were obtained and evaluated as adsorbents of hydrogen sulfide at ambient conditions. The surface properties of the initial and exhausted samples were studied by FTIR, TEM, SEM/EDX, XRD, adsorption of nitrogen, potentiometric titration, and thermal analysis. The results obtained show a significant improvement in their adsorption capacities compared to parent compounds. The importance of the OH groups of cobalt (hydr)oxide/GO composites and new interface chemistry for the adsorption of hydrogen sulfide on these materials is revealed. The oxygen activation by the carbonaceous component resulted in formation of sulfites. Water enhanced the removal process. This is the result of the basic environment promoting dissociation of H(2)S and acid-base reactions. Finally, the differences in the performance of the materials with different mass ratios of GO were linked to the availability of active sites on the surface of the adsorbents, dispersion of these sites, their chemical heterogeneity, and location in the pore system.
制备了氧化钴（氢氧化物）与氧化石墨烯（GO）的复合材料，并将其作为硫化氢在环境条件下的吸附剂进行了评估。通过傅里叶变换红外光谱（FTIR）、透射电子显微镜（TEM）、扫描电子显微镜/能谱仪（SEM/EDX）、X射线衍射（XRD）、氮气吸附、电位滴定和热分析等方法研究了初始样品和耗尽样品的表面性质。所得结果表明，与母体化合物相比，它们的吸附容量有显著提高。揭示了氧化钴（氢氧化物）/GO复合材料的羟基以及新的界面化学对这些材料吸附硫化氢的重要性。碳质组分对氧的活化导致了亚硫酸盐的形成。水促进了去除过程。这是碱性环境促进H₂S离解和酸碱反应的结果。最后，不同质量比的GO材料在性能上的差异与吸附剂表面活性位点的可用性、这些位点的分散性、它们的化学不均匀性以及在孔系统中的位置有关。
