Experimental study on adsorption–desorption characteristics of granular activated carbon/R134a pair

2012 ◽  
Vol 35 (3) ◽  
pp. 494-498 ◽  
Author(s):  
Ahmed A. Askalany ◽  
M. Salem ◽  
I.M. Ismail ◽  
Ahmed Hamza H. Ali ◽  
M.G. Morsy
Keyword(s):  
Experimental Study ◽  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Adsorption Desorption

Experimental Study on a Chemisorption Refrigeration System Prototype Using Expanded Graphite/Activated Carbon/Lithium Chloride-Ammonia Working Pair in a Solution of 25% NH3

2019 ◽  
Vol 947 ◽  
pp. 52-57
Author(s):  
Mauricio Carmona ◽  
Eduar Pérez ◽  
Julian Yepes ◽  
Silvana Villalobos
Keyword(s):  
Experimental Study ◽  
Activated Carbon ◽  
Lithium Chloride ◽  
Expanded Graphite ◽  
Refrigeration System ◽  
Experimental Protocol ◽  
Cooling Effects ◽  
Adsorption Desorption ◽  
System Prototype ◽  
Experimental Rig

This paper presents the experimental results given by the operation of a chemical sorption refrigeration system using Expanded Graphite/Activated Carbon/Lithium Chloride (AC/GE/LiCl)-Adsorbent (NH3 in solution with a 25% concentration). Experimental protocol with the characteristics of the experimental rig developed, working pair specifications and the procedure that has developed in the process is described in detail. Results are presented for different behaviors of the system, where the desorption stage is driven by forced convection. Measurements of the thermal variables of the system show that the adsorption-desorption cycles in the test accomplished, with high and low-pressure zones clearly defined. The cooling effects for the pair material studied have the expected behavior for the mixture proposed.

Effects of ultrasound on adsorption–desorption of p-chlorophenol on granular activated carbon

2003 ◽  
Vol 10 (2) ◽  
pp. 109-114 ◽  
Author(s):  
O. Hamdaoui ◽  
E. Naffrechoux ◽  
L. Tifouti ◽  
C. Pétrier
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Adsorption Desorption

Adsorption and desorption of perchloroethylene in soils, peat moss, and granular activated carbon

1989 ◽  
Vol 16 (6) ◽  
pp. 798-806 ◽  
Author(s):  
Richard Zytner ◽  
Nihar Biswas ◽  
Jatinder K. Bewtra
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Freundlich Isotherm ◽  
Peat Moss ◽  
Organic Carbon Content ◽  
Dry Cleaning ◽  
Desorption Process ◽  
The Media ◽  
Desorption Isotherms ◽  
Adsorption Desorption

Studies were conducted to evaluate the adsorption–desorption isotherms of a common dry cleaning solvent, perchloroethylene (PCE), in soils, peat moss, and granular activated carbon. The results obtained followed the Freundlich Isotherm, and the organic carbon content of the media was the most significant controlling factor in the adsorption–desorption process. The peat moss exhibited the highest residual saturation concentration for pure PCE amongst all the media tested. The desorption studies indicated that PCE had medium mobility in soil and was not significantly affected by moderate changes in pH. Key words: adsorption, desorption, Freundlich Isotherm, granular activated carbon, peat moss, perchloroethylene, soils.

scholarly journals Hydrochlorofluorocarbon Adsorption by Granular and Extruded Activated Carbons

1996 ◽  
Vol 13 (3) ◽  
pp. 187-195 ◽  
Author(s):  
S.H. Lin ◽  
Y.W. Chen ◽  
J.K. Huang
Keyword(s):  
Activated Carbon ◽  
Polyurethane Foam ◽  
Activated Carbons ◽  
Granular Activated Carbon ◽  
Experimental Results ◽  
Rigid Polyurethane Foam ◽  
Foaming Agent ◽  
Adsorption And Desorption ◽  
Desorption Efficiency ◽  
Adsorption Desorption

Experiments have been conducted to examine the adsorption/desorption characteristics of 1,1-dichloro-1-fluoroethane (HCFC-141b) by granular activated carbon (GAC) and extruded activated carbon. HCFC-141b is currently deemed an excellent replacement for CFC-11, a foaming agent widely used in the rigid polyurethane foam industries. Experimental results of adsorption and desorption were analyzed in terms of the equilibrium capacity, time to reach equilibrium and desorption efficiency of the adsorbent, and with the aim of assessing the viability of using both adsorbents for possible HCFC-141b recovery. The results have clearly revealed great potential for both adsorbents for this purpose.

scholarly journals Effect of Sodium Benzenesulfonate on SO42− Removal from Water by Polypyrrole-Modified Activated Carbon

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Feng Zhang ◽  
Dong-Sheng Wang ◽  
Fan Yang ◽  
Tian-Yu Li ◽  
Hong-Yan Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Granular Activated Carbon ◽  
Langmuir Model ◽  
Sulfate Adsorption ◽  
Modified Activated Carbon ◽  
Pseudo Second Order ◽  
Acidic Conditions ◽  
Adsorption Desorption ◽  
Desorption Cycle

Sodium benzenesulfonate was doped into polypyrrole-modified granular activated carbon (pyrrole-FeCl3·(6H2O)-sodium benzenesulfonate-granular activated carbon; PFB-GAC) with the goal of improving the modified GAC’s ability to adsorb sulfate from aqueous solutions. At a GAC dosage of 2.5 g and a pyrrole concentration of 1 mol L−1, the adsorption capacity of PFB-GAC prepared using a pyrrole:FeCl3·(6H2O):sodium benzenesulfonate ratio of 1000 : 1500 : 1 reached 23.05 mg g−1, which was eight times higher than that for GAC and two times higher than that for polypyrrole-modified GAC without sodium benzenesulfonate. Adsorption was favored under acidic conditions and high initial sulfate concentrations. Doping with sodium benzenesulfonate facilitated polymerization to give polypyrrole. Sodium benzenesulfonate introduced more imino groups to the polypyrrole coating, and the N+ sites improved ion exchange of Cl− and SO42− and increased the adsorption capacity of sulfate. Adsorption to the PFB-GAC followed pseudo-second-order kinetics. The adsorption isotherm conformed to the Langmuir model, and adsorption was exothermic. Regeneration using a weak alkali (NH3·H2O), which released OH− slowly, caused less damage to the polypyrrole than using a strong alkali (NaOH) as the regeneration reagent. NH3·H2O at a concentration of 12 mol L−1 (with the same OH− concentration as 2 mol L−1 NaOH) released 85% of the sorbed sulfate in the first adsorption-desorption cycle, and the adsorption capacity remained >6 mg g−1after five adsorption-desorption cycles.

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