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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: PCPF-1 possesses a large BET surface area and exhibits strong hydrophobicity with a water contact angle of 135°, which afford it the highest adsorptive capacities for saturated hydrocarbons and gasoline among sorbent materials reported thus far.
127 citations
TL;DR: In this paper, the activation step was performed at the microwave input power of 600 W and irradiation time of 7 min, and the porosity, functional and surface chemistry were featured by means of low temperature nitrogen adsorption, scanning electron microscopy and Fourier transform infrared spectroscopy.
Abstract: In this work, pistachio nut shell, a biomass residue abundantly available from the pistachio nut processing industries, was utilized as a feedstock for the preparation of activated carbon (PSAC) via microwave assisted KOH activation. The activation step was performed at the microwave input power of 600 W and irradiation time of 7 min. The porosity, functional and surface chemistry were featured by means of low temperature nitrogen adsorption, scanning electron microscopy and Fourier transform infrared spectroscopy. Result showed that the BET surface area, Langmuir surface area, and total pore volume of PSAC were 700.53 m 2 g −1 , 1038.78 m 2 g −1 and 0.375 m 3 g −1 , respectively. The adsorptive property of PSAC was tested using methylene blue dye as the targeted adsorbate. Equilibrium data was best fitted by the Langmuir isotherm model, showing a monolayer adsorption capacity of 296.57 mg g −1 . The study revealed the potentiality of microwave-induced activation as a viable activation method.
127 citations
TL;DR: In this article, a high surface area titania−silica binary oxide support was prepared according to the homogeneous precipitation method and was coated with a monolayer of vanadium oxide.
Abstract: A high surface area titania−silica binary oxide support was prepared according to the homogeneous precipitation method and was coated with a monolayer of vanadium oxide. The TiO2−SiO2 support and the V2O5/TiO2−SiO2 catalyst were then subjected to thermal treatments from 773 to 1073 K. The influence of heat treatments on the dispersion and thermal stability was investigated by X-ray diffraction, FT infrared, X-ray photoelectron spectroscopy, oxygen uptake, and BET surface area methods. The results suggest that TiO2−SiO2 is quite thermally stable even up to 1073 K calcination temperature. However, the V2O5/TiO2−SiO2 catalyst is stable, in terms of dispersion and surface area, only up to a calcination temperature of 873 K. Thermal treatments beyond this temperature transformed vanadia and titania into crystalline phases and then titania anatase into rutile phase.
127 citations
TL;DR: In this article, the effects of activation conditions, such as the temperature, activation time, and mass ratio of KOH/C, on the textural properties of the resulting activated mesoporous carbons were investigated.
Abstract: Mesoporous carbon with a narrow pore size distribution centered at about 9 nm, which was prepared by self assembly of block copolymer and phloroglucinol-formaldehyde resin via the soft-template method, was activated by CO2 and potassium hydroxide (KOH). The effects of activation conditions, such as the temperature, activation time, and mass ratio of KOH/C, on the textural properties of the resulting activated mesoporous carbons were investigated. Activated mesoporous carbons exhibit high BET specific surface areas (up to ∼ 2000 m2 g−1) and large pore volumes (up to ∼ 1.6 cm3 g−1), but still maintain a highly mesoporous structure. Heat treatment of mesoporous carbons by CO2 generally requires a moderate to high extent of activation in order to increase its BET surface area by 2–3 times, while KOH activation needs a much smaller degree of activation than the former to reach an identical surface area, ensuring high yields of activated mesoporous carbons. In addition, KOH activation allows a controllable degree of activation by adjusting the mass ratio of KOH/C (2–8), as evidenced by the fact that surface area and pore volume increase with the mass ratio of KOH/C. The electrosorption properties of activated mesoporous carbons were investigated by cyclic voltammetry in 0.1 M NaCl aqueous solutions. Upon activation, the electrosorption capacitance of activated mesoporous carbons was greatly enhanced.
126 citations
TL;DR: The research of kinetics and isotherms displayed that the pseudo-second-order kinetic model and the Langmuir isotherm model fitted the data well and the SA-PAM/GO hydrogel composites have potential to remove the heavy metal ions from water body effectively.
126 citations