scholarly journals Effect of Solution pH on the Adsorption of Paracetamol on Chemically Modified Activated Carbons

Molecules ◽  
2017 ◽  
Vol 22 (7) ◽  
pp. 1032 ◽  
Author(s):  
Valentina Bernal ◽  
Alessandro Erto ◽  
Liliana Giraldo ◽  
Juan Moreno-Piraján
Keyword(s):  
Activated Carbons ◽  
Solution Ph ◽  
Chemically Modified ◽  
Modified Activated Carbons

scholarly journals Oxytetracycline Adsorption from Aqueous Solutions on Commercial and High-Temperature Modified Activated Carbons

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3481
Author(s):  
Joanna Lach ◽  
Agnieszka Ociepa-Kubicka ◽  
Maciej Mrowiec
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Activated Carbons ◽  
Electricity Consumption ◽  
Solution Ph ◽  
Carbon Modification ◽  
Modification Method ◽  
Flow Through ◽  
Proposed Modification ◽  
Modified Activated Carbons

The aim of the work was to evaluate the possibility of using commercial and modified activated carbons for the removal of oxytetracycline from aqueous solutions. The kinetics and statics of adsorption as well as the effect of the activated carbon dose and solution pH on the efficiency of the oxytetracycline adsorption were analyzed. Based on the study of oxytetracycline adsorption isotherms, the activated carbons were ranked in the following order: F-300 > WG-12 > Picabiol > ROW08 > WACC 8 × 30 > F-100 > WAZ 0.6–2.4. The most effective activated carbons were characterized by large specific surfaces. The best matching results were obtained for: Redlich–Peterson, Thot and Jovanovic models, and lower for the most frequently used Freundlich and Langmuir models. The adsorption proceeded better from solutions with pH = 6 than with pH = 3 and 10. Two ways of modifying activated carbon were also assessed. A proprietary method of activated carbon modification was proposed. It uses the heating of activated carbon as a result of current flow through its bed. Both carbons modified at 400 °C in the rotary kiln and on the proprietary SEOW (Joule-heat) modification stand enabled to obtain adsorbents with higher and comparable monolayer capacities. The advantage of the proposed modification method is low electricity consumption.

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 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
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