Selective Adsorption of Platinum from Mixed Solutions Containing Base Metals Using Chemically Modified Activated Carbons

2005 ◽  
Vol 40 (1-3) ◽  
pp. 507-523 ◽  
Author(s):  
H. Kasaini ◽  
R. C. Everson ◽  
O. S. L. Bruinsma
Keyword(s):  
Activated Carbons ◽  
Selective Adsorption ◽  
Base Metals ◽  
Chemically Modified ◽  
Mixed Solutions ◽  
Modified Activated Carbons

scholarly journals An alternative low-cost adsorbent for gold recovery from cyanide-leached liquors: Adsorption isotherm and kinetic studies

2018 ◽  
Vol 37 (1-2) ◽  
pp. 3-23 ◽  
Author(s):  
Refiloe Tsolele ◽  
Fanyana Moses Mtunzi ◽  
Michael John Klink ◽  
Vusumzi Emmanuel Pakade
Keyword(s):  
Activated Carbons ◽  
Selective Adsorption ◽  
Low Cost ◽  
Kinetic Studies ◽  
Agitation Speed ◽  
Gold Recovery ◽  
Attractive Alternative ◽  
Solution Ph ◽  
Initial Concentration ◽  
Modified Activated Carbons

Pristine Macadamia nutshell-based activated carbons were chemically oxidized with different concentrations of H3PO4 and HNO3 to increase their surface adsorption properties and further explore if they could be an attractive alternative low-cost adsorbent for gold recovery from cyanide-leached liquors. The modified activated carbons were labeled MACN20, MACN40 and MACN55 to signify the materials prepared from 20%, 40% and 55% (v/v) HNO3, respectively. Similar nomenclature was followed for H3PO4-modified activated carbons. Brunauer-Emmet-Teller, scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, elemental analysis and X-ray diffraction spectroscopy were used to characterize the prepared activated carbons. The physical properties were attained through determining attrition, ash content, volatile matter and moisture content of all the activated carbons. Various parameters that affect selective adsorption such as the effect of initial concentration, time, agitation speed, interfering species and the dose of the adsorbent were investigated. Optimal parameters for gold ion adsorption were as follows: solution pH, 10; contact time, 6 h; agitation speed, 150 r/min; sorbent amount, 4 g and initial concentration, 5.5 mg/L. The observed selectivity order was not the same for all the adsorbents, but the adsorption of gold was found to be mostly influenced in the presence of nickel and least influenced by copper. MACN55 was found to be the most efficient adsorbent with 74% of gold adsorption from a real-world sample and displayed a similar performance to coconut-based activated carbons.

scholarly journals Thermodynamic data of phenol adsorption on chemically modified activated carbons

Data in Brief ◽  
2020 ◽  
Vol 29 ◽  
pp. 105240
Author(s):  
Liliana Giraldo ◽  
Valentina Bernal Fernandez ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Thermodynamic Data ◽  
Activated Carbons ◽  
Phenol Adsorption ◽  
Chemically Modified ◽  
Modified Activated Carbons

SURFACE ALTERATION OF ACTIVATED CARBON FOR DETOXIFICATION OF COPPER (II) FROM INDUSTRIAL EFFLUENTS

2013 ◽  
Vol 20 (02) ◽  
pp. 1350021
Author(s):  
SADAF BHUTTO ◽  
M. NASIRUDDIN KHAN
Keyword(s):  
Activated Carbons ◽  
Selective Adsorption ◽  
Low Cost ◽  
Industrial Effluents ◽  
Copper Adsorption ◽  
Adsorption Capacities ◽  
Surface Alteration ◽  
Equilibrium Data ◽  
Modified Activated Carbons ◽  
Acetic Acids

The low-cost modified activated carbons were prepared from Thar and Lakhra (Pakistan) coals by activation with sulfuric acid and further modified with citric, tartaric and acetic acids for the selective adsorption of Cu(II) from aqueous solution. The original carbon obtained from activated Thar and Lakhra coals at pH 3.0 displayed significant adsorption capacity for lead and insignificant capacity values (0.880 and 0.830 mg⋅g-1) for copper. However, after modification with citric, tartaric and acetic acid the copper adsorption capacities enhanced in the range of 5.56–21.85 and 6.05–44.61 times, respectively. The Langmuir, Freundlich and Temkin adsorption isotherms were used to elucidate the observed sorption phenomena. The isotherm equilibrium data was well fitted by the Langmuir and sufficiently fitted to the Freundlich models. The calculated thermodynamic parameters such as change in Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) inferred that the investigated adsorption was spontaneous and endothermic in nature. Based on the results, it was concluded that the surface alteration with citric and tartaric acid, Thar and Lakhra activated carbons had significant potential for selective removal of copper(II) from industrial wastewater.

Surface properties of chemically modified activated carbons for adsorption rate of Cr (VI)

2005 ◽  
Vol 115 (1-2) ◽  
pp. 133-138 ◽  
Author(s):  
Naiqin Zhao ◽  
Na Wei ◽  
Jiajun Li ◽  
Zhijun Qiao ◽  
Jing Cui ◽  
...  
Keyword(s):  
Surface Properties ◽  
Activated Carbons ◽  
Adsorption Rate ◽  
Chemically Modified ◽  
Modified Activated Carbons

scholarly journals Removal of naphthalene from aqueous solution on chemically modified activated carbons

2007 ◽  
Vol 41 (2) ◽  
pp. 333-340 ◽  
Author(s):  
C.O. Ania ◽  
B. Cabal ◽  
C. Pevida ◽  
A. Arenillas ◽  
J.B. Parra ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons ◽  
Chemically Modified ◽  
Modified Activated Carbons

Experimental and theoretical studies of adsorption of ibuprofen on raw and two chemically modified activated carbons: new physicochemical interpretations

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 12363-12373 ◽  
Author(s):  
Lotfi Sellaoui ◽  
Hanen Guedidi ◽  
SarraWjihi SarraWjihi ◽  
Laurence Reinert ◽  
Salah Knani ◽  
...  
Keyword(s):  
Adsorption Isotherms ◽  
Activated Carbons ◽  
Theoretical Studies ◽  
Chemically Modified ◽  
Modified Activated Carbons ◽  
Experimental And Theoretical Studies

Knowledge of the ibuprofen (IBP) adsorption isotherms is important to understand and to improve its depollution process.

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