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BET theory
About: BET theory is a research topic. Over the lifetime, 9046 publications have been published within this topic receiving 286142 citations.
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01 Oct 2000
TL;DR: The present study has demonstrated that the heterogeneity of carbon surface for the phenol adsorption can be attributed to the different energies required for Adsorption in different-size micropores.
Abstract: The influence of the pore size distribution of activated carbon on the adsorption of phenol from aqueous solutions was explored. Activated carbons with different porous structures were prepared by gasifying a bituminous coal char to different extents of burn-off. The results of adsorption experiments show that the phenol capacity of these carbons does not proportionally increase with their BET surface area. This reflects the heterogeneity of the carbon surface for adsorption. The pore size distributions of these carbons, determined according to the Dubinin-Stoeckli equation, were found to vary with the burn-off level. By incorporating the distribution with the Dubinin-Radushkevich equation using an inverse proportionality between the micropore size and the adsorption energy, the isotherms for the adsorption of phenol onto these carbons can be well predicted. The present study has demonstrated that the heterogeneity of carbon surface for the phenol adsorption can be attributed to the different energies required for adsorption in different-size micropores. Copyright 2000 Academic Press.
96 citations
TL;DR: The photocatalytic activity did not increase when the as-synthesized TiO2/AC was thermally treated, but was much higher than commercial P-25 in degradation of phenol by irradiation of electrodeless discharge lamps (EDLs).
96 citations
TL;DR: A series of hydroxyl ammonium ionic liquids/layered double hydroxides intercalation composites (ILs/LDHs) were synthesized and adopted to study the adsorption process of anionic dye reactive orange 5 from aqueous solutions.
96 citations
TL;DR: In this article, the catalytic wet air oxidation (WAO) of p -coumaric acid (PCA) has been investigated over Fe- and Zn-promoted ceria catalysts.
Abstract: The catalytic wet air oxidation (WAO) of p -coumaric acid (PCA) has been investigated over Fe- and Zn-promoted ceria catalysts. The catalysts have been prepared by the coprecipitation method and have been characterized by X-ray diffraction (XRD), BET surface area, SEM–EDX and temperature programmed reduction (TPR). The oxidation reaction was carried out in a batch reactor under an air pressure of 2 MPa and in the temperature range 353–403 K. Fe-CeO 2 catalysts, with 20–50 mol% of iron, were found more effective than the unpromoted and Zn-promoted ceria catalysts. On the basis of characterization data, it has been suggested that the higher activity of the Fe-promoted catalysts is related to the modification of the structural and redox properties of the ceria oxide catalyst on addition of iron.
96 citations
30 Apr 2018
TL;DR: N,S-Doped activated carbon was directly prepared via a facile and cost-efficient hydrothermal reaction, followed by alkali activation of elm flower (EL)-derived biomass, resulting in EL-derived activated carbon (ELAC), which achieved a specific capacitance of 275 F g–1 at a current density of 1 A g-1 and retained a capacitance retention of 87.2% after 5000 cycles.
Abstract: N,S-Doped activated carbon was directly prepared via a facile and cost-efficient hydrothermal reaction, followed by alkali activation of elm flower (EL)-derived biomass. The EL-derived activated carbon (ELAC) had N and S contents of 2.21 and 6.06 atom %, respectively, in addition to a high Brunauer-Emmett-Teller (BET) surface area of 2048.6 m2 g-1 and moderate pore volume of 0.88 cm3 g-1. Owing to its high BET surface area and N/S functional groups, ELAC achieved a specific capacitance of 275 F g-1 at a current density of 1 A g-1 and retained a capacitance of 216 F g-1 at 20 A g-1. In addition, a symmetric supercapacitor based on N,S-self-doped ELAC electrode provided a capacitance of 62 F g-1 at a current density of 10 A g-1, with maximum energy and power densities of 16.8 Wh kg-1 and 600 W kg-1, respectively. The capacitance retention was also high, at 87.2%, at 4 A g-1 after 5000 cycles.
96 citations