Understanding the solid-liquid equilibria between Paracetamol and activated carbon: Thermodynamic approach of the interactions adsorbent-adsorbate using equilibrium, kinetic and calorimetry data.

The microporous structure of the activated carbon fibre KF1500 was investigated by applying a new technique as presented here. This was based on a combination of high-pressure CO2 adsorption measurements between 253 K and 353 K with direct measurement of the differential heats of adsorption at 298 K at low and medium coverages. The validity of this approach was tested by using two activated carbons which has been characterized previously by a variety of techniques, including immersion calorimetry. It appears that a combination of high-pressure adsorption and calorimetry with CO2 alone is a useful tool for the characterization of the whole range of microporosity. This approach confirms earlier observations, according to which the initial stage of adsorption by strongly activated carbons corresponds to adsorption on the walls of large micropores rather than to the primary filling of small micropores.

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Effects of DTAB on Performance of Nano Pd/C Catalyst for Purification of Terephthalic Acid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.662.140 ◽

2013 ◽

Vol 662 ◽

pp. 140-144 ◽

Cited By ~ 1

Author(s):

Fa Xin Xiao ◽

Yan Song Li ◽

Xin Yang Xu ◽

Xiao Ni Shen ◽

Yong Peng Ren ◽

...

Keyword(s):

Crystal Structure ◽

Catalytic Activity ◽

Activated Carbon ◽

Specific Surface ◽

Terephthalic Acid ◽

Dodecyltrimethylammonium Bromide ◽

Solid Liquid Interface ◽

Solid Liquid ◽

Palladium Particles ◽

Stable Structures

The 0.5 wt.% Pd/C catalysts used for purification of terephthalic acid(TA) were prepared, and the effects of dodecyltrimethylammonium bromide(DTAB) concentration on activity and microstructure of catalysts were investigated by means of SEM, TEM, XRD,HPLC,specific surface area(BET) and porosity test. The results show that DTAB can increase the activity of Pd/C catalysts, and the catalytic activity increases with the increase in DTAB concentration and nearly remains constant with further increase after it exceeds 0.5 wt.%.. DTAB can clean the surface of activated carbon and diminish the palladium size of Pd/C catalysts. The addition of DTAB has effects in crystal structure of nano Pd/C catalysts, and the Pd crystal planes of (111) and (200) was replaced by a broad reflections after DTAB added. DTAB tends to form various meta-stable structures(spherical or cylindrical)at the solid-liquid interface that helps finer grain for mation and hinders subsequent coarsening of the palladium particles.

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Immersion Enthalpy of Activated Carbon–Cyclohexane and Activated Carbon–Hexane. Difference in the Solid–Liquid Interaction Enthalpy Due to the Structure of the Solvent

Processes ◽

10.3390/pr7040180 ◽

2019 ◽

Vol 7 (4) ◽

pp. 180

Author(s):

Diana Hernández-Monje ◽

Liliana Giraldo ◽

Juan Moreno-Piraján

Keyword(s):

Activated Carbon ◽

Activated Carbons ◽

Molecular Size ◽

Liquid System ◽

Micropore Volume ◽

Immersion Enthalpy ◽

Molecular Arrangement ◽

The Difference ◽

Enthalpy Of Immersion ◽

Solid Liquid

The enthalpy of immersion for five activated carbons (with different surface chemistry) in cyclohexane and hexane was determined in order to observe the intensity of the solid–liquid interaction. The enthalpy of immersion was related to the properties of activated carbons, such as micropore volume, total basic groups content, and the EoWo product, that characterized each solid-liquid system. The values for the immersion enthalpy were between −21.2 and −91.7 J g−1 for cyclohexane and between −16.4 and −66.1 J g−1 for hexane. It showed greater interaction between the cyclohexane and the activated carbons and it was related to the properties of this adsorbate, such as molecular size and molecular arrangement. The difference in the enthalpy of immersion between the solvents per unit of micropore volume for the set of activated carbons was calculated obtaining a value of −487 J cm−3.

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Activated carbon surface heterogeneity seen by parallel probing by inverse liquid chromatography at the solid/liquid interface and by gas adsorption analysis at the solid/gas interface

Carbon ◽

10.1016/j.carbon.2006.10.004 ◽

2007 ◽

Vol 45 (2) ◽

pp. 240-247 ◽

Cited By ~ 8

Author(s):

C. Garnier ◽

T. Görner ◽

F. Villiéras ◽

Ph. De Donato ◽

M. Polakovič ◽

...

Keyword(s):

Liquid Chromatography ◽

Activated Carbon ◽

Gas Adsorption ◽

Surface Heterogeneity ◽

Liquid Interface ◽

Carbon Surface ◽

Adsorption Analysis ◽

Solid Liquid Interface ◽

Solid Liquid

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Synthesis of nano-zirconium-iron oxide supported by activated carbon composite for the removal of Sb(v) in aqueous solution

RSC Advances ◽

10.1039/d1ra06117h ◽

2021 ◽

Vol 11 (49) ◽

pp. 31131-31141

Author(s):

Yanjun Liu ◽

Lingda Meng ◽

Kai Han ◽

Shujuan Sun

Keyword(s):

Magnetic Field ◽

Aqueous Solution ◽

Activated Carbon ◽

Iron Oxide ◽

External Magnetic Field ◽

Carbon Composite ◽

Liquid Separation ◽

Highly Effective ◽

Solid Liquid ◽

Solid Liquid Separation

The adsorbent was highly effective in the removal of Sb(v). The adsorbent easily achieved solid–liquid separation under the action of an external magnetic field.

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Surface Area and Porosity Development on Granular Activated Carbon by Zirconium: Adsorption Isotherm Studies

Journal of Applied Research and Technology ◽

10.22201/icat.16656423.0.16.3.719 ◽

2019 ◽

Vol 16 (3) ◽

Author(s):

V. Sivanandan Achari ◽

A. S. Rajalakshmi ◽

S. Jayasree ◽

Raichel Mary Lopez

Keyword(s):

Electron Microscopy ◽

Activated Carbon ◽

Surface Area ◽

Activated Carbons ◽

Granular Activated Carbon ◽

Surface Characteristics ◽

Isotherm Models ◽

Activation Temperature ◽

Adsorption Data ◽

Solid Liquid

In this study, a new series of coconut shell based granular activated carbons (GAC) are prepared by impregnating with zirconium ions as zirconyl chloride and activated under superheated steam. These carbons are designated with activation temperature/ conditions as GAC 383 (activated at 383K), GACO 383 (HNO3 oxidised), GACZR 1273 (ZrOCl2 activated at 1273K) and GACOZR 1273 (HNO3 oxidised, ZrOCl2 activated at 1273K). Surface characteristics of these carbons are evaluated using Boehm titration methods, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction techniques (XRD), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The pore volume and the respective specific surface area of each carbon are determined by BET, I plot, Langmuir, Freundlich, and Dubinin-Radushkevich isotherms using N2 adsorption data at 77K. Analysis shows that zirconium ion enhances the surface area and porosity of granular activated carbon. The adsorption characteristics of newly prepared GAC are tested by solid-liquid equilibria using phenol as adsorbate. Equilibrium phenol adsorption data fitted to standard isotherm models of Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) equations. Adsorption constants and parameters indicate that zirconium impregnated granular activated carbons are relatively more efficient for the removal of phenol than the native carbon used.

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