Kinetics of CO2 Adsorption on Microwave Palm Shell Activated Carbon

2014 ◽  
Vol 1043 ◽  
pp. 224-228 ◽  
Author(s):  
Noor Shawal Nasri ◽  
Usman Dadum Hamza ◽  
Nor Aishah Saidina Amin ◽  
Jibril Mohammed ◽  
Murtala Musa Ahmed ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
Diffusion Mechanism ◽  
Co2 Uptake ◽  
Intraparticle Diffusion Model ◽  
Palm Shell ◽  
Model Pore ◽  
Pseudosecond Order ◽  
Kinetics Of

Activated carbon was prepared from palm shell by pyrolysis followed by K2CO3 assisted microwave heating. Effects of temperature on adsorption capability and kinetics of the sorbent towards CO2 adsorption was also studied. The results indicated that, the amount CO2 adsorbed decrease as the adsorption temperature increases. The kinetic data were obtained using a static volumetric method at 303.15, 343.15, 378.15, and 443.15 K and at pressures up to 4 bar. The kinetics of CO2 adsorption on the activated carbons was examined using the pseudofirst-order equation and pseudosecond-order equations. Weber and Morris intraparticle diffusion model was applied to examine the mechanism of the adsorption system. Lowest CO2 uptake recorded was 0.3 mmol/g at 443.15 K and 0.5 bar while the highest was 7.45mmol/g obtained at 303.15 K and 4 bar. The kinetics followed pseudosecond-order model. Pore diffusion is not the sole rate diffusion mechanism.

scholarly journals Equilibrium and Kinetics of CO2 Adsorption by Coconut Shell Activated Carbon Impregnated with Sodium Hydroxide

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 201
Author(s):  
Chaiyot Tangsathitkulchai ◽  
Suravit Naksusuk ◽  
Atichat Wongkoblap ◽  
Poomiwat Phadungbut ◽  
Prapassorn Borisut
Keyword(s):  
Activated Carbon ◽  
Sodium Hydroxide ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
Nitrogen Adsorption ◽  
Coconut Shell ◽  
Type I ◽  
Equilibrium And Kinetics ◽  
Coconut Shell Activated Carbon ◽  
Kinetics Of

The equilibrium and kinetics of CO2 adsorption at 273 K by coconut-shell activated carbon impregnated with sodium hydroxide (NaOH) was investigated. Based on nitrogen adsorption isotherms, porous properties of the tested activated carbons decreased with the increase of NaOH loading, with the decrease resulting primarily from the reduction of pore space available for nitrogen adsorption. Equilibrium isotherms of CO2 adsorption by activated carbons impregnated with NaOH at 273 K and the pressure up to 100 kPa displayed an initial part of Type I isotherm with most adsorption taking place in micropores in the range of 0.7–0.9 nm by pore-filling mechanisms. The amount of CO2 adsorbed increased with the increase of NaOH loading and passed through a maximum at the optimum NaOH loading of 180 mg/g. The CO2 isotherm data were best fitted with the three-parameter Sips equation, followed by Freundlich and Langmuir equations. The pore diffusion model, characterized by the effective pore diffusivity (De), could well describe the adsorption kinetics of CO2 in activated carbons impregnated with NaOH. The variation of De with the amount of CO2 adsorbed showed three consecutive regions, consisting of a rapid decrease of De for CO2 loading less than 40 mg/g, a relatively constant value of De for the CO2 loading of 40–80 mg/g and a slow decrease of De for the CO2 loading of 80–200 mg/g. The maximum De occurred at the optimum NaOH loading of 180 mg/g, in line with the equilibrium adsorption results. The values of De varied from 1.1 × 10−9 to 5.5 × 10−9 m2/s, which are about four orders of magnitude smaller than the molecular diffusion of CO2 in air. An empirical correlation was developed for predicting the effective pore diffusivity with the amount of CO2 adsorbed and NaOH loading.

scholarly journals Electrospun Composites Made of Reduced Graphene Oxide and Polyacrylonitrile-Based Activated Carbon Nanofibers (rGO/ACNF) for Enhanced CO2 Adsorption

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2117
Author(s):  
Faten Ermala Che Othman ◽  
Norhaniza Yusof ◽  
Javier González-Benito ◽  
Xiaolei Fan ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Graphene Oxide ◽  
Activated Carbon ◽  
Reduced Graphene Oxide ◽  
Carbon Nanofibers ◽  
Co2 Adsorption ◽  
Morphological Properties ◽  
Co2 Uptake ◽  
Order Model ◽  
Activated Carbon Nanofibers ◽  
Reduced Graphene

In this work, we report the preparation of polyacrylonitrile (PAN)-based activated carbon nanofibers composited with different concentrations of reduced graphene oxide (rGO/ACNF) (1%, 5%, and 10% relative to PAN weight) by a simple electrospinning method. The electrospun nanofibers (NFs) were carbonized and physically activated to obtain activated carbon nanofibers (ACNFs). Texture, surface and elemental properties of the pristine ACNFs and composites were characterized using various techniques. In comparison to pristine ACNF, the incorporation of rGO led to changes in surface and textural characteristics such as specific surface area (SBET), total pore volume (Vtotal), and micropore volume (Vmicro) of 373 m2/g, 0.22 cm3/g, and 0.15 cm3/g, respectively, which is much higher than the pristine ACNFs (e.g., SBET = 139 m2/g). The structural and morphological properties of the pristine ACNFs and their composites were studied by Raman spectroscopy and X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM) respectively. Carbon dioxide (CO2) adsorption on the pristine ACNFs and rGO/ACNF composites was evaluated at different pressures (5, 10, and 15 bars) based on static volumetric adsorption. At 15 bar, the composite with 10% of rGO (rGO/ACNF0.1) that had the highest SBET, Vtotal, and Vmicro, as confirmed with BET model, exhibited the highest CO2 uptake of 58 mmol/g. These results point out that both surface and texture have a strong influence on the performance of CO2 adsorption. Interestingly, at p < 10 bar, the adsorption process of CO2 was found to be quite well fitted by pseudo-second order model (i.e., the chemisorption), whilst at 15 bar, physisorption prevailed, which was explained by the pseudo-first order model.

Pine cone shell-based activated carbon used for CO2 adsorption

2016 ◽  
Vol 4 (14) ◽  
pp. 5223-5234 ◽  
Author(s):  
Kaimin Li ◽  
Sicong Tian ◽  
Jianguo Jiang ◽  
Jiaming Wang ◽  
Xuejing Chen ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
Adsorption Performance ◽  
Pine Cone

After carbonization and activation, pine cone shell-based activated carbons were used to adsorb CO2, and presenting a good adsorption performance.

MICROWAVE ASSISTED K2CO3 PALM SHELL ACTIVATED CARBON AS SORBENT FOR CO2 ADSORPTION APPLICATION

2016 ◽  
Vol 78 (8-3) ◽  
Author(s):  
Usman Dadum Hamza ◽  
Noor Shawal Nasri ◽  
Nor Aishah Saidina Amin ◽  
Jibril Mohammed ◽  
Husna Mohd Zain
Keyword(s):  
Activated Carbon ◽  
Porous Carbon ◽  
Co2 Adsorption ◽  
Co2 Uptake ◽  
Adsorption Method ◽  
Equilibrium Data ◽  
Different Temperatures ◽  
Co2 Adsorption Capacity ◽  
Adsorption Equilibrium Data ◽  
Best Fit

Carbon dioxide is believed to be a major greenhouse gas (GHG) that contributes to global warming. In this study, palm shells were used as a precursor to prepare CO2 activated carbon sorbents via carbonization, chemical impregnation with K2CO3 and microwave activation.  Adsorption equilibrium data for CO2 adsorption on the porous carbon were obtained at different temperatures using static volumetric adsorption method. Langmuir, Freundlich, Sips and Toths models were used to correlate the experimental data. The CO2 adsorption capacity at 303.15, 343.15, 378.15 443.15 K and 1 bar on the sorbent was 2.71, 1.5, 0.77, 0.69 mmol/g respectively. Sips isotherm was found to have the best fit. The results indicated that the porous carbon sorbent prepared by carbonization and microwave K2CO3 assisted activation have good CO2 uptake. The porous carbons produced are therefore good candidates for CO2 adsorption applications

CO2 Adsorption by Modified Palm Shell Activated Carbon (PSAC) Via Chemical and Physical Activation and Metal Impregnation

2016 ◽  
Vol 203 (11) ◽  
pp. 1455-1463 ◽  
Author(s):  
Muhammad Younas ◽  
Loong Kong Leong ◽  
Abdul Rahman Mohamed ◽  
Sumathi Sethupathi
Keyword(s):  
Activated Carbon ◽  
Co2 Adsorption ◽  
Physical Activation ◽  
Palm Shell ◽  
Metal Impregnation

scholarly journals Carbon Dioxide Adsorption on Porous and Functionalized Activated Carbon Fibers

2019 ◽  
Vol 9 (10) ◽  
pp. 1977 ◽  
Author(s):  
Yu-Chun Chiang ◽  
Cheng-Yu Yeh ◽  
Chih-Hsien Weng
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Pore Volume ◽  
Co2 Adsorption ◽  
Physical Adsorption ◽  
Koh Activation ◽  
Co2 Uptake ◽  
Activated Carbon Fibers

Polyacrylonitrile-based activated carbon fibers (ACFs), modified using potassium hydroxide (KOH) or tetraethylenepentamine (TEPA), were investigated for carbon dioxide (CO2) adsorption, which is one of the promising alleviation approaches for global warming. The CO2 adsorption isotherms were measured, and the values of isosteric heat of adsorption were calculated. The results showed that the KOH-modified ACFs exhibited a great deal of pore volume, and a specific surface area of 1565 m2/g was obtained. KOH activation made nitrogen atoms easily able to escape from the surface of ACFs. On the other hand, the surface area and pore volume of ACFs modified with TEPA were significantly reduced, which can be attributed to the closing or blocking of micropores by the N-groups. The CO2 adsorption on the ACF samples was via exothermic reactions and was a type of physical adsorption, where the CO2 adsorption occurred on heterogeneous surfaces. The CO2 uptakes at 1 atm and 25 °C on KOH-activated ACFs reached 2.74 mmole/g. This study observed that microporosity and surface oxygen functionalities were highly associated with the CO2 uptake, implying the existence of O-C coordination, accompanied with physical adsorption. Well cyclability of the adsorbents for CO2 adsorption was observed, with a performance decay of less than 5% over up to ten adsorption-desorption cycles.

The Characteristics of Oil Palm Shell Biochar and Activated Carbon Produced via Microwave Heating

2014 ◽  
Vol 695 ◽  
pp. 12-15 ◽  
Author(s):  
A.M. Abioye ◽  
Farid Nasir Ani
Keyword(s):  
Activated Carbon ◽  
Microwave Heating ◽  
Oil Palm ◽  
Activated Carbons ◽  
Value Added ◽  
Management Control ◽  
Bet Surface Area ◽  
Climate Mitigation ◽  
Palm Shell ◽  
Oil Palm Shell

Biochar was produced from oil palm shell via microwave-induced pyrolysis. The biochar was subsequently activated via microwave assisted CO2 activation. A simple single layer arrangement of the microwave absorber (coconut shell based activated carbon) and oil palm shell in the reactor was adopted during pyrolysis. In recent times, the treatment of oil palm biomass using microwave heating technology has been on the increase. Value added products such as bio-oil, gas, biochar and activated carbon are being produced while at the same time serving as waste management control. Biochar is seen as a promising climate mitigation tool. Activated carbons can be used as absorbent for the removal of pollutants from wastewaters, as air pollution control and as electrode for supercapacitor. This paper presents comparative study between the characteristics of oil palm shell biochar and oil palm shell activated carbon. BET surface area and Scanning Electron Microscopy (SEM) were analyzed to establish the characteristics of the biochar and activated carbon.

scholarly journals Biomass-derived activated carbon with simultaneously enhanced CO2 uptake for both pre and post combustion capture applications

2016 ◽  
Vol 4 (1) ◽  
pp. 280-289 ◽  
Author(s):  
Helena Matabosch Coromina ◽  
Darren A. Walsh ◽  
Robert Mokaya
Keyword(s):  
Activated Carbon ◽  
Activated Carbons ◽  
Co2 Uptake ◽  
Camellia Japonica

Activated carbons from biomass (grass and Camellia japonica) exhibit enhanced CO2 uptake at 25 °C; up to 1.5 mmol g−1 at 0.15 bar, 5.0 mmol g−1 at 1 bar and 21.1 mmol g−1 at 20 bar, and depending on level of activation, have excellent uptake at both low (≤1 bar) and high (20 bar) pressure.

Enhancing Sustainable Recycle Solid Waste to Porous Activated Carbon for Methane Uptake

2014 ◽  
Vol 705 ◽  
pp. 19-23
Author(s):  
Noor Shawal Nasri ◽  
Ramlan Noorshaheeda ◽  
Usman Dadum Hamza ◽  
Jibril Mohammed ◽  
Murtala Musa Ahmed ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Activated Carbons ◽  
Low Cost ◽  
Palm Kernel ◽  
Methane Adsorption ◽  
Coconut Shell ◽  
Palm Kernel Shell ◽  
Freundlich Isotherms ◽  
Palm Shell ◽  
Methane Uptake

Potential agro wastes (i.e palm kernel shell and coconut shell) for producing low cost activated carbon (AC) was investigated. In this study, the activated carbon was produced by carbonization, chemical impregnation with KOH and microwave irradiation. The pyrolysis was carried out at 700 °C in an inert environment for 2 h. Microwave activation was carried out at 400W for 6 minutes. Characteristics of the material were investigated using Fourier transform infrared spectroscopy (FT-IR) analysis and scanning electrode microscopy (SEM). Methane adsorption equilibrium data on the activated carbons produced were obtained using static volumetric method. Microwave palm shell activated carbon (MPAC) and microwave coconut shell activated carbon (MCAC) recorded highest methane uptake of 2.489 and 1.929 mmol/g at 3 bar, 30°C. The adsorption data were correlated with Langmuir and Freundlich isotherms. The results shows that microwave activated carbon from palm shell and coconut shell have good methane adsorption characteristics.

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