scholarly journals Relation Between the Adsorbed Quantity and the Immersion Enthalpy in Catechol Aqueous Solutions on Activated Carbons

2011 ◽  
Vol 13 (1) ◽  
pp. 44-55 ◽  
Author(s):  
Juan Carlos Moreno-Piraján ◽  
Diego Blanco ◽  
Liliana Giraldo
Keyword(s):  
Aqueous Solutions ◽  
Activated Carbons ◽  
Immersion Enthalpy ◽  
Adsorbed Quantity

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.

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 Effect of Surface Acidic Groups of Activated Carbons on The Adsorption Rate from Aqueous Solutions

TANSO ◽  
1991 ◽  
Vol 1991 (148) ◽  
pp. 151-156
Author(s):  
Kazuji Kushiro ◽  
Hirokazu Oda ◽  
Chikao Yokokawa
Keyword(s):  
Aqueous Solutions ◽  
Activated Carbons ◽  
Adsorption Rate ◽  
Effect Of Surface

Adsorption of Phenolic Compounds from Aqueous Solutions, by Activated Carbons, Described by the Dubinin−Astakhov Equation

Langmuir ◽  
2001 ◽  
Vol 17 (11) ◽  
pp. 3301-3306 ◽  
Author(s):  
Fritz Stoeckli ◽  
M. Victoria López-Ramón ◽  
Carlos Moreno-Castilla
Keyword(s):  
Phenolic Compounds ◽  
Aqueous Solutions ◽  
Activated Carbons

159. Adsorption studies of strontium on activated carbons from aqueous solutions

Carbon ◽  
1984 ◽  
Vol 22 (2) ◽  
pp. 221-222
Author(s):  
J Rivera-Utrilla ◽  
M.A Ferro-Garcia ◽  
A Mata-Arjona
Keyword(s):  
Aqueous Solutions ◽  
Activated Carbons ◽  
Adsorption Studies
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