DETERMINATION OF THE IMMERSION ENTHALPY OF ACTIVATED CARBON BY MICROCALORIMETRY OF THE HEAT CONDUCTION

2000 ◽  
Vol 28 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Juan Carlos Moreno ◽  
Liliana Giraldo
Keyword(s):  
Activated Carbon ◽  
Heat Conduction ◽  
Immersion Enthalpy

scholarly journals A Study of the Interactions of Activated Carbon-Phenol in Aqueous Solution Using the Determination of Immersion Enthalpy

2018 ◽  
Vol 8 (6) ◽  
pp. 843 ◽  
Author(s):  
Ana Carvajal-Bernal ◽  
Fernando Gómez-Granados ◽  
Liliana Giraldo ◽  
Juan Moreno-Piraján
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Immersion Enthalpy

A Heat Conduction Microcalorimeter for the Determination of the Immersion Heats of Activated Carbon into Phenol Aqueous Solutions

2003 ◽  
Vol 31 (4) ◽  
pp. 385-397 ◽  
Author(s):  
Liliana Giraldo ◽  
José I. Huertas ◽  
Alexander Valencia ◽  
Juan Carlos Moreno
Keyword(s):  
Activated Carbon ◽  
Heat Conduction ◽  
Aqueous Solutions

scholarly journals Thermodynamic study of the interactions of salicylic acid and granular activated carbon in solution at different pHs

2017 ◽  
Vol 36 (3-4) ◽  
pp. 833-850 ◽  
Author(s):  
Valentina Bernal ◽  
Liliana Giraldo ◽  
Juan C Moreno-Piraján
Keyword(s):  
Salicylic Acid ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Activated Carbons ◽  
Granular Activated Carbon ◽  
Molecular Size ◽  
Carbon Surface ◽  
Immersion Enthalpy ◽  
Inappropriate Use

The inappropriate use of pain medication has led to the appearance of salicylic acid molecules (aspirin’s metabolite excretion) in surface water, which causes problems for the environment. The adsorption process using activated carbon is one of the processes that is used for the removal of organic compounds present in the aqueous phase; however, the percentage of removal depends on the physicochemical properties of the adsorbent and the adsorbate such as: pore size, surface area, surface chemistry, molecular size and solubility. In this work, we have studied the adsorbent–adsorbate interactions through the determination of the immersion enthalpy of the activated carbon in salicylic acid aqueous solutions; due to the solute and activated carbon surface have functional groups capable of ionized with the pH, the adsorption study was carried out at pH 2, 7, and 11. The activated carbons selected for the study were a granular activated carbon and a reduced activated carbon to 1173 K; as the immersion liquid were used salicylic acid aqueous solutions with concentrations between 0.072 mmol/ l and 0.72 mmol/ l, the solutions at pH 2 and 11 were prepared with HCl and NaOH solutions, respectively. It was determined that the immersion enthalpy is between −7.39 J /g and −22.5 J/g for the reduced activated carbon and between −7.63 J/g and −16.73 J/g for the granular activated carbon.

Examination of Conditions for the Determination of Carbamate Pesticides in Soils

1992 ◽  
Vol 57 (8) ◽  
pp. 1632-1638 ◽  
Author(s):  
Věra Tatarkovičová ◽  
Zdeněk Stránský
Keyword(s):  
Activated Carbon ◽  
Solvent Extraction ◽  
Soil Type ◽  
Extraction Procedure ◽  
Purification Procedure ◽  
Factors Affecting ◽  
Carbamate Pesticides ◽  
Rp Hplc ◽  
Extracting Solvent

The procedure for the determination of carbamate pesticides in soil was optimized. The following factors affecting the final results were investigated: extracting solvent, extraction procedure, extract purification procedure, and soil type. Triple extraction with acetone and purification of the extract on a two-stage purification column containing an activated carbon-silica gel 1+1 mixture were found optimal. The extracts after treatment were analyzed by RP-HPLC with UV detection. The method developed allows carbamate pesticides in soil to be determined at concentrations in excess of 30 μg kg-1.

Revisiting the Determination of Langmuir ParametersApplication to Tetrahydrothiophene Adsorption onto Activated Carbon

Langmuir ◽  
2008 ◽  
Vol 24 (13) ◽  
pp. 6420-6424 ◽  
Author(s):  
Benoit Boulinguiez ◽  
Pierre Le Cloirec ◽  
Dominique Wolbert
Keyword(s):  
Activated Carbon

scholarly journals Thermal impedance at the interface of contacting bodies: 1-D examples solved by semi-derivatives

2012 ◽  
Vol 16 (2) ◽  
pp. 623-627 ◽  
Author(s):  
Jordan Hristov
Keyword(s):  
Heat Conduction ◽  
Fractional Calculus ◽  
Half Time ◽  
Thermal Impedance ◽  
Entire Domain ◽  
Transient Thermal ◽  
Two Bodies

Simple 1-D semi-infinite heat conduction problems enable to demonstrate the potential of the fractional calculus in determination of transient thermal impedances of two bodies with different initial temperatures contacting at the interface ( x = 0 ) at t = 0 . The approach is purely analytic and uses only semi-derivatives (half-time) and semi-integrals in the Riemann-Liouville sense. The example solved clearly reveals that the fractional calculus is more effective in calculation the thermal resistances than the entire domain solutions.

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