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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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TL;DR: In this paper, two quadratic models were developed for BET surface area and yield of activated carbon using Design-Expert software, and the models were used to calculate the optimum operating conditions for production of activation carbon providing a compromise between BET surface areas and yield.
237 citations
TL;DR: In this paper, metal oxide nanoparticles such as ZnO and SnO 2 with specific surface areas of 15.75 and 24.48 cm 2 /g were successfully synthesized by precipitation method and then employed as adsorbents for removal of Malachite Green Oxalate (MGO) and hexavalent Chromium (Cr) from aqueous solution.
236 citations
TL;DR: In this paper, high-surface area activated carbons were prepared by chemical activation of Paulownia (Paulownia elongata) wood with H3PO4 as a chemical activating agent.
Abstract: High-surface area activated carbons were prepared by chemical activation of Paulownia (Paulownia elongata) wood with H3PO4 as a chemical activating agent. The chemical activation process was conducted at different impregnation ratios (1–4) and final carbonization temperatures (300–600 °C). The influences of carbonization temperature and impregnation ratio on the surface area, pore development and yield of activated carbon were investigated. The effect of the impregnation ratio on the porous structure of the activated carbon is stronger than that of the final carbonization temperature. H3PO4 was found to be more effective for developing microporous structure in the activated carbon. A final carbonization temperature of 400 °C and impregnation ratio of 4 were found to be suitable for producing high-surface-area activated carbon. The pore properties of the carbons including the BET surface area, pore volume, pore size distribution, and average pore diameter were determined by adsorption of N2 at 77 K using the BET, t-plot and density functional theory (DFT) methods. BET surface area and total pore volume values were achieved as high as 2806 m2/g and 1.746 cm3/g, respectively. Activated carbons were also examined with instrumental methods such as SEM and FTIR.
235 citations
TL;DR: In this article, the adsorption process was found to be exothermic in nature in the case of methylene blue (MB) and malachite green (MG) for textile dyes.
234 citations
01 May 2004
TL;DR: The surface fractal dimension D was used to examine whether or not the surface screening effect exists and the pore blocking effect was examined with the changes of mean pore size before and after adsorbing basic dyes.
Abstract: Ca-montmorillonite (Ca-Mont) was exchanged with titanium cations and the adsorption equilibrium and kinetics of Basic Green 5 (BG5) and Basic Violet 10 (BV10) on these montmorillonites were measured to examine the ion-exchange effects on the basic dyes adsorption. The relationship between the dye adsorption and the alteration of pore structures of montmorillonite induced by ion-exchange processes was discussed. Moreover, the changes in the surface and pore structure of montmorillonites during adsorption were characterized based on classical and fractal analyses of the nitrogen adsorption isotherms as well as the XRD patterns. The decrease in BET surface area of montmorillonites after adsorption of dyes was interpreted in terms of both the coverage of some surface roughness (surface screening effect) and the inhibition of the movement of nitrogen molecule into some pores (pore blocking effect). The surface fractal dimension D was used to examine whether or not the surface screening effect exists and the pore blocking effect was examined with the changes of mean pore size before and after adsorbing basic dyes.
233 citations