Experimental Study of Adsorption on Activated Carbon for CO₂Capture

Abstract

The adsorption of carbon dioxide (CO) on activated carbon (AC) prepared from olive trees has been investigated by using a fixed bed adsorption apparatus. The adsorption equilibrium and breakthrough curves were determined at different temperatures 30, 50, 70, and 90°C in order to investigate both kinetic and thermodynamic parameters. Maximum CO 2 sorption capacity on AC ranged from 109.5 to 35.46 and from 129.65 to 35.55 mg CO 2 /g of AC for initial concentrations 10 and 13.725% vol., respectively. Different isotherm models are applied to mathematically model the CO 2 adsorption, and on the basis of the estimated adsorption capacity by model and determination coefficient (r 2), the Langmuir model provides a perfect fit to the experimental data owing to closeness of the r 2 to unity. From the correlation coefficient, it is found that the pseudo-second-order model is well-fitted with the experimental data. In addition, it indicates that CO 2 adsorption is a physical adsorption process and demonstrates a behavior of an exothermic reaction, which is consistent with the thermodynamic analysis. The results obtained in this study conclude that AC prepared from olive trees can be considered as adequate for designing a fixed bed cycle to separate carbon dioxide from flue gases and serve as a benchmark while searching for inexpensive and superior activated carbon production in future studies.

Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

“…Slightly higher adsorption can be achieved in the presence of high concentrations of mixed complexing agents (3 and 4 mM of each agent). This is probably because a high concentration of (Au 2 S 2 O 3 )­(SO 3 ) 2 5– in the bulk liquid can initiate a high concentration gradient between the bulk phase and the surface of TiO 2 , resulting in an increased mass transfer as well as an increased adsorption capacity. , In the presence of light, increasing the concentration of mixed complexing agents slightly decreased the photocatalytic efficiency for Au recovery compared with that in the absence of complexing agents, probably attributed to the shielding behavior of densely surrounded species in the presence of a high concentration of complexing agents. Based on the obtained results, among all employed commercial semiconductors, TiO 2 exhibited the highest photocatalytic recovery of Au from the simulated spent non-cyanide plating bath both in the absence and presence of complexing agents at all explored concentrations.…”

Equilibrium Volumetric Experiment Apparatus Review for Mixed-Gas Adsorption

“…Dynamic adsorption or breakthrough adsorption occurs when C/C0 equals to one. To measure the residual gas, which is the outtake gas concentration when equilibrium is reached, a gas analyzer [5][6][7] or gas chromatography can be used. Also, an additional chamber could be installed to extend the volume of the apparatus system, which is suitable for gas concentration measurement.…”

Adsorption of CO2 on Activated Carbon, Fe‐Based Metal Organic Framework, ZnO, and CaO for Carbon Capture and Storage Application

“…AC from sea mango (Cerbera odollam) -9.851 mg CO2 g sol -1 [9] AC from olive trees 30 °C, 1 bar 129.651 mg CO2 g AC -1 [10] Agro-waste-based AC 25 °C, 1 bar 80 mg CO2 g adsorbent -1 [11] Calcium oxide-silica and magnesium oxide-silica composites 120 °C, 10 g of coconut shell was soaked for 12 h in phosphoric acid at a ratio of 1:1.5. The activation temperature and time were set to 400 °C and 10 min.…”

“…There are many publications concerning CO 2 adsorption over ACs, MOFs, and metal oxides. Previous studies revealed the development and utilization of AC nanoparticles owing to their high CO 2 adsorption capacities [9][10][11]. On the other hand, few researchers have investigated the role of various metal oxides in the capture of CO 2 , such as zinc oxide (ZnO) and calcium oxide (CaO) [12].…”