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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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Journal ArticleDOI
Junke Ou1, Yongzhi Zhang1, Li Chen1, Qian Zhao1, Yan Meng1, Yong Guo1, Dan Xiao1 
TL;DR: In this article, an ox horn derived carbon (OHC) has been successfully synthesized through an economically viable and an environmentally benign approach such that the OHC possesses a large surface area (BET surface area is 1300 m2 g−1), a unique 3D porous nanostructure and a high inherent nitrogen content (55%).
Abstract: Nitrogen-rich porous carbon derived from ox horns has been successfully synthesized through an economically viable and an environmentally benign approach Such an ox horn derived carbon (OHC) possesses a large surface area (BET surface area is 1300 m2 g−1), a unique 3D porous nanostructure and a high inherent nitrogen content (55%) The OHC, as an anode material for lithium ion batteries (LIBs), exhibits superior electrochemical performances, such as a high reversible capacity (1181 mA h g−1 at a current density of 100 mA g−1) and a superior rate capability (304 mA h g−1 at 5 A g−1) Furthermore, this study demonstrates the exploitation of a universal material in nature, viz, ox horn, as a potential anode for the most sought after energy storage application

274 citations

Journal ArticleDOI
TL;DR: In this article, three Ni-based catalysts with the same nickel content (10 wt%) were prepared by conventional impregnation of commercial γ-Al2O3 support (NiAlCO-IM), sol-gel-made NiAlSG-IM and direct sol−gel processing from organometallic compounds, respectively.

273 citations

Journal ArticleDOI
15 May 2003
TL;DR: A Zn/Al hydrotalcite-like compound (HTlc) was prepared by co-precipitation (at constant pH) method and was characterized by XRD, TG/DTA, FTIR, and BET surface area and it was found that the percentage of adsorption decreases with increase in temperature, which shows that the Adsorption process is exothermic in nature.
Abstract: A Zn/Al hydrotalcite-like compound (HTlc) was prepared by co-precipitation (at constant pH) method and was characterized by XRD, TG/DTA, FTIR, and BET surface area The ability of Zn/Al oxide to remove F− from aqueous solution was investigated All the adsorption experiments were carried out as a function of time, pH, concentration of adsorbate, adsorbent dose, temperature etc It was found that the maximum adsorption takes place within 4 h at pH 60 The percentage of adsorption increases with increase in the adsorbent dose, but decreases with increase in the adsorbate concentration From the temperature variation it was found that the percentage of adsorption decreases with increase in temperature, which shows that the adsorption process is exothermic in nature The adsorption data fitted well into the linearly transformed Langmuir equation Sulfate and phosphate were found to have profound effects on fluoride removal Thermodynamic parameters such as ΔG0, ΔH0, and ΔS0 were calculated The negative value of ΔH0 indicates that the adsorption process is exothermic The apparent equilibrium constants (Ka) are also calculated and found to decrease with increase in temperature With 001 M NaOH the adsorbed F− could be completely desorbed from Zn/Al oxide in 6 h

272 citations

Journal ArticleDOI
23 May 2019-ACS Nano
TL;DR: The controlled alkaline hydrolysis of MOFs to produce layered double hydroxide (LDH) while maintaining the porosity and morphology of MOF particles is reported, which allows the recycling of organic ligands and large-scale synthesis of LDH materials.
Abstract: Pseudomorphic conversion of metal-organic frameworks (MOFs) enables the fabrication of nanomaterials with well-defined porosities and morphologies for enhanced performances. However, the commonly reported calcination strategy usually requires high temperature to pyrolyze MOF particles and often results in uncontrolled growth of nanomaterials. Herein, we report the controlled alkaline hydrolysis of MOFs to produce layered double hydroxide (LDH) while maintaining the porosity and morphology of MOF particles. The preformed trinuclear M3(μ3-OH) (M = Ni2+ and Co2+) clusters in MOFs were demonstrated to be critical for the pseudomorphic transformation process. An isotopic tracing experiment revealed that the 18O-labeled M3(μ3-18OH) participated in the structural assembly of LDH, which avoided the leaching of metal cations and the subsequent uncontrolled growth of hydroxides. The resulting LDHs maintain the spherical morphology of MOF templates and possess a hierarchical porous structure with high surface area (BET surface area up to 201 m2·g-1), which is suitable for supercapacitor applications. As supercapacitor electrodes, the optimized LDH with the Ni:Co molar ratio of 7:3 shows a high specific capacitance (1652 F·g-1 at 1 A·g-1) and decent cycling performance, retaining almost 100% after 2000 cycles. Furthermore, the hydrolysis method allows the recycling of organic ligands and large-scale synthesis of LDH materials.

271 citations

Journal ArticleDOI
Rui Zhao1, Yong Wang1, Xiang Li1, Bolun Sun1, Ce Wang1 
TL;DR: Water-insoluble β-cyclodextrin-based electrospun fibers synthesized by electrospinining followed by thermal cross-linking exhibited high adsorption capacity for cationic dye methylene blue with good recyclability and potential applications in the dye wastewater treatment field were suggested.
Abstract: Water-insoluble β-cyclodextrin-based fibers were synthesized by electrospinining followed by thermal cross-linking. The fibers were characterized by field-emission scanning electron microscopic (FE-SEM) and Fourier transformed infrared spectrometer (FT-IR). The highly insoluble fraction obtained from different pH values (3-11) indicates successful cross-linking reactions and their usability in aqueous solution. After the cross-linking reaction, the fibers' tensile strength increases significantly and the BET surface area is 19.49 m(2)/g. The cross-linked fibers exhibited high adsorption capacity for cationic dye methylene blue (MB) with good recyclability. The adsorption performance can be fitted well with pseudo-second-order model and Langmuir isotherm model. The maximum adsorption capacity is 826.45 mg/g according to Langmuir fitting. Due to electrostatic repulsion, the fibers show weak adsorption toward negatively charged anionic dye methyl orange (MO). On the basis of the selective adsorption, the fiber membrane can separate the MB/MO mixture solution by dynamic filtration at a high flow rate of 150 mL/min. The fibers can maintain good fibrous morphology and high separation efficiency even after five filtration-regeneration cycles. The obtained results suggested potential applications of β-cyclodextrin-based electrospun fibers in the dye wastewater treatment field.

271 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023166
2022356
2021525
2020551
2019533
2018531