外文翻譯---活性炭和活化海泡石顆粒對(duì)nh3和h2s吸附性能研究-在線(xiàn)瀏覽
2025-03-07 00:01本頁(yè)面
【正文】 surface of sepiolite, (ii) the external surface area is high,191 m2/g [5], (iii) microporosity is homogeneous because of the existence of microporous channels in the interior of the fibres, the volume of micropores being much smaller than in activated carbon.To evaluate the role of microporosity in the adsorption of NH3 and H2S, the Dubinin–Radushkevich equation has been applied to the adsorption isotherms,using adsorbate densities of and g/cm3 for NH3 and H2S, respectively. The corresponding values of micropore volume have been plotted in Fig. 1 versus those derived from the adsorption of N2, the slope of the reference line being unity. It is important to note that for most adsorbents the value of micropore volume deduced from the three adsorbates is very similar. Only for the sample with a wider micropore size distribution, C53,the volume deduced from the adsorption of ammonia is somewhat lower than for the adsorption of hydrogen sulphide, and both lower than the value measured with nitrogen.A good way to pare the interaction of the adsorbent surface with the different adsorbates is to plot the socalled characteristic curves, where the amount adsorbed, as a liquid, is plotted versus the adsorption potential. As a typical example, Fig. 2 includes the curves for the activated carbon C53 and the sepiolite carbon C53 (Fig. 2a) one can consider that the three adsorbates fit a single curve, this meaning that the energy of interaction between the carbon surface and the adsorbates is a function of the adsorbent and not the adsorbate. Consequently, the porosity of the carbon is the main factor controlling the adsorption of NH3 and H2S, the micropores being filled in a similar fashion as for nitrogen.This is not the case for sepiolite, Fig. 2b where the adsorption energy is very strong for ammonia as pared with hydrogen sulphide or nitrogen, thus indicating the presence of specific interactions in addition to the nonspecific ones. In fact, the volume of micropores for sepiolite deduced from the adsorption of nitrogen, cm3/g, is similar to the value deduced from H2S,although somewhat lower than the value deduced for NH3, cm3/g, as it can be seen in Fig. 1. The special affinity of sepiolite for ammonia has been described by some authors [6], whom
公司管理相關(guān)推薦
鄂ICP備17016276號(hào)-1