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 Adsorption Equilibrium and Kinetics of the Removal of Ammoniacal Nitrogen by Zeolite X/Activated Carbon Composite Synthesized from Elutrilithe

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Yong Zhang ◽  
Feng Yu ◽  
Wenping Cheng ◽  
Jiancheng Wang ◽  
Juanjuan Ma
Keyword(s):  
Activated Carbon ◽  
Adsorption Kinetics ◽  
Nitrogen Adsorption ◽  
Carbon Composite ◽  
Ammoniacal Nitrogen ◽  
Zeolite X ◽  
Carbon Composite Material ◽  
Equilibrium And Kinetics ◽  
Hydrothermal Transformation ◽  
Kinetics Of

Zeolite X/activated carbon composite material (X/AC) was prepared from elutrilithe, by a process consisting of carbonization, activation, and subsequent hydrothermal transformation of aluminosilicate in alkaline solution, which was used for the removal of ammoniacal nitrogen from aqueous solutions. Adsorption kinetics, equilibrium, and thermodynamic were studied and fitted by various models. The adsorption kinetics is best depicted by pseudosecond-order model, and the adsorption isotherm fits the Freundlich and Redlich-Peterson model. This explains the ammoniacal nitrogen adsorption onto X/AC which was chemical adsorption in nature. Thermodynamic properties such as ΔG, ΔH, and ΔS were determined for the ammoniacal nitrogen adsorption, and the positive enthalpy confirmed that the adsorption process was endothermic. It can be inferred that ammoniacal nitrogen removal by X/AC composite is attributed to the ion exchange ability of zeolite X. Further, as a novel sorbent, this material has the potential application in removing ammoniacal nitrogen coexisting with other organic compounds from industrial wastewater.

Preparation of Capacitor’s Electrode from Coconut Shell

2014 ◽  
Vol 875-877 ◽  
pp. 1585-1589
Author(s):  
Arenst Andreas Arie ◽  
Joong Kee Lee
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Electrode Materials ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Coconut Shell ◽  
Bet Surface Area ◽  
Type I ◽  
Activation Temperature ◽  
Bet Analysis

Activated carbons were prepared from coconut shell by chemical activation method and utilized as electrode materials for electrochemical double layer capacitor (EDLC). A preliminary characteristic of activated carbon from coconut shell includes the Brunnaeur Emmett Teller (BET) analysis and cyclic voltammetry measurements. The BET surface area is not affected by the variation of activation temperature as both of the samples showed BET surface area of about 850-870 m2g-1. The N2 adsorption–desorption isotherms showed that the sample exhibited type I characteristics according to IUPAC classification, which confirms its micro-porosity. Compared with the un-activated carbon samples, the activated ones exhibited the better electrochemical properties with a specific capacitance of 150 F g−1 at a scan rate of 2 mV s−1. The good performance of activated carbon is attributed to the enhancement of surface area due to the KOH pretreatment which can open new pores accessible for the ionic transport

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 High-performance removal of methyl mercaptan by nitrogen-rich coconut shell activated carbon

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 22892-22899 ◽  
Author(s):  
Qiang Liu ◽  
Ming Ke ◽  
Feng Liu ◽  
Pei Yu ◽  
Haiqiang Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
High Performance ◽  
Activated Carbons ◽  
Coconut Shell ◽  
Methyl Mercaptan ◽  
Quaternary Nitrogen ◽  
Coconut Shell Activated Carbon ◽  
Pyridinic Nitrogen

Nitrogen-rich coconut shell activated carbons were prepared with high CH3SH capacity and easy regeneration. The catalytic activity is closely related to the contents of pyridinic nitrogen and quaternary nitrogen.

scholarly journals Comparative Analysis of Activated Carbons from African Teak (Iroko) Wood and Coconut Shell in Palm Oil Bleaching

2021 ◽  
Author(s):  
Davidson C Onwumelu
Keyword(s):  
Activated Carbon ◽  
Palm Oil ◽  
Activated Carbons ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Coconut Shell ◽  
Adsorbent Dosage ◽  
Hot Air ◽  
Fuller’S Earth ◽  
Coconut Shell Activated Carbon

This study compares the effectiveness of activated carbons from the African Teak/Iroko wood (Milicia excelsia) and coconut shell as adsorbents in Crude Palm Oil (CPO) bleaching. This was done in order to source for local agro-waste substitutes for the imported Fuller’s earth. The materials were activated using analytical grade CaCl2 in 25% solution at a temperature of 109OC in a laboratory hot air oven. The obtained activated carbon samples were subjected to proximate analysis to ascertain their percentage ash, moisture, volatile matter and fixed carbon contents. The CPO to be analysed was degummed, neutralized and further bleached using 2g, 4g, 6g, 8g, 10g, 12g and 14g of the adsorbent samples at a temperature of 130OC after which the obtained oils were analysed and results plotted. It was observed that the bleached oil samples generally had reduced specific gravity, opacity, colour, and free fatty acid (FFA) compared to the CPO. It was also observed that the opacity, colour, and FFA reduced as the adsorbent dosage increased. Conversely, the percentage colour reduction and the percentage FFA reduction increased with adsorbent dosage. Overall, the oil samples bleached by activated carbon from the African Teak/Iroko wood exhibited more desirable properties than the ones bleached by the coconut shell activated carbon.

Sustainable development of coconut shell activated carbon (CSAC) & a magnetic coconut shell activated carbon (MCSAC) for phenol (2-nitrophenol) removal

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85390-85410 ◽  
Author(s):  
Ankur Sarswat ◽  
Dinesh Mohan
Keyword(s):  
Sustainable Development ◽  
Activated Carbon ◽  
Activated Carbons ◽  
Coconut Shell ◽  
Slow Pyrolysis ◽  
Coconut Shell Activated Carbon

Slow pyrolysis coconut shell (CSAC) and magnetic coconut shell (MCSAC) activated carbons were prepared, characterized and used for aqueous 2-nitrophenol (2-NP) removal.

Equilibrium and kinetics of CO2 adsorption onto activated carbon

2017 ◽  
Vol 108 ◽  
pp. 1941-1946 ◽  
Author(s):  
Skander Jribi ◽  
Takahiko Miyazaki ◽  
Bidyut Baran Saha ◽  
Animesh Pal ◽  
Mohamed M. Younes ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Co2 Adsorption ◽  
Equilibrium And Kinetics ◽  
Kinetics Of
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