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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 article, the porosity of carbon-based adsorbents was controlled by thermal treatment at 1173 K in CO2 environment, and the equilibrium sulfur adsorption capacities of each adsorbent were measured for both model and commercial diesel.
Abstract: Carbon-based adsorbents with controlled porosity were prepared to investigate the adsorption capacity of refractory sulfur compounds. The porosity of carbon-based adsorbents was controlled by thermal treatment at 1173 K in CO2 environment. The equilibrium sulfur adsorption capacities of each adsorbent were measured for both model and commercial diesel. Pore widening of carbon-based adsorbents by CO2 activation increased BET surface area, total pore volume, micropore volume, and sulfur adsorption capacity. However, the sulfur adsorption capacity did not increase linearly according to the increase of BET surface area, total pore volume, and BJH pore volume, which included the properties of meso- and macropores. Specific micropore volume, whose pore diameters range from 0.63 to 1.2 nm, showed good linear relationship with sulfur adsorption capacity for commercial diesel. Model diesel adsorption tests supported that adsorbents with proper pore size for target sulfur molecules should be prepared for the enhanc...
101 citations
TL;DR: In this article, a facile strategy is developed to prepare carbon/ferrous sulfide/iron composites by an in situ carbonization reduction method using agricultural waste hemp stems as the carbon precursor and ferrisulfas as the iron source.
Abstract: A facile strategy is developed to prepare carbon/ferrous sulfide/iron (C/FeS/Fe) composites by an in situ carbonization reduction method using agricultural waste hemp stems as the carbon precursor and ferrisulfas as the iron source. Under the reductive atmosphere generated from biomass carbonization, ferrisulphas can be in situ directly decomposed and reduced into FeS/Fe at 800 °C existing in the form of nanoparticles embedded in a carbon matrix; so this synthetic procedure is much simpler compared with traditional multistep methods. The C/FeS/Fe composite, as expected, displays an excellent Cr(VI) removal performance with a maximum capacity of 127 mg/g at pH 5 because of the adsorption on its large surface and simultaneous reducing actions that have been evidenced by XPS analysis. Although the presence of FeS/Fe gives rise to an obvious decline of BET surface area, the strong reducibility can compensate for the loss of surface area and significantly enhance Cr(VI) removal especially at a low pH. The syne...
101 citations
TL;DR: In this article, the removal of heavy metals from industrial wastewater using TiO 2 nanoparticles modified with poly-amidoamine dendrimer (PAMAM, G 4 ) was investigated.
101 citations
TL;DR: In this article, an anion exchange resin (NDP-2) was synthesized for selective nitrate removal in the binary co-existence systems, and the characterization of NDP-2 have been performed by FT-IR, SEM and BET surface area analyses.
100 citations
TL;DR: Two-dimensional Co-based MOF-on-MOF heterojunction nanostructures with improved electrocatalytic activity and better long-term stability were successfully constructed via a mild two-step solution route, employing Co2+ ions as the center atoms and 1,4-benzenedicarboxylate and 4,4'-biphenyldicar boxylate as ligands.
Abstract: Two-dimensional (2D) Co-based MOF-on-MOF heterojunction nanostructures with improved electrocatalytic activity were successfully constructed via a mild two-step solution route, employing Co2+ ions as the center atoms, and 1,4-benzenedicarboxylate (BDC) and 4,4'-biphenyldicarboxylate (BPDC) as ligands. The as-obtained heterojunction nanostructures were characterized by field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) technologies. Electrochemical measurements showed that as-prepared Co-BPDC/Co-BDC heterojunction nanostructures presented markedly enhanced OER electrocatalytic activity, compared with single Co-BPDC, Co-BDC, and/or their physical mixture. Also, the Co-BPDC/Co-BDC-3 heterojunction prepared after treatment for 3 h exhibited the strongest catalytic activity. To reach the current density jgeo = 10 mA cm-2, the Co-BPDC/Co-BDC-3 heterojunction-modified glassy carbon electrode required an overpotential of 335 mV in 1 M KOH, which was reduced by 57 and 93 mV, compared to the electrodes modified by Co-BDC and Co-BPDC, respectively. Simultaneously, the heterojunction catalyst also displayed better long-term stability. The improvement of the above performances should be attributed to the increased structure stability, BET surface area, ECSA, and electron transfer ability of the heterojunction.
100 citations