Synthesis of modified rice husk activated carbon and study on their carbon dioxide (co2) adsorption capacity

Characterization studies of impregnated activated carbon with monoethanolamine (MEA), diethanolamine (DEA), and piperazine as potential carbon dioxide (CO2) adsorbent were conducted. The adsorption capacity of the activated carbon can be increased by introducing amine group on the surface of the adsorbent. MEA, DEA, and piperazine were selected as amino compounds for the binding process on activated carbon surface. The synthesis of impregnated activated carbon was prepared according to concentration and mixture ratio. The physicochemical properties of impregnated activated carbon were characterized by x-ray diffraction (XRD), Brunauer, Emmett and Teller (BET), fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). The XRD analysis was used to determine the type of compound present on the activated carbon surface. The result revealed that the diffraction angles around 21.54º to 22.18º were linked for pyrazole, ethanolamine, diethanolamine, and benzalazine which prove the presence of hydrocarbon and amine on the activated carbon surfaces. From the BET analysis, the total surface area and pore volume decreased with increase in concentration of alkanolamine. The presence of amide functional groups in FTIR analysis at 3288 cm-1and 1651 cm-1band for the impregnated activated carbon proved that a reaction occured between carboxyl groups on the activated carbon surfaces with amine bonded. As for FESEM analysis, it was shown that the morphology of the non-impregnated activated carbon contained many pores on its surface while the pores on the impregnated activated carbon with alkanolamine were filled with amines according to the selected concentration. The sample chosen for CO2 adsorption capacity study was of the highest concentration and mixture ratio of piperazine, namely 75 wt.% and 1:2 activated carbon to piperazine ratio, respectively. The CO2 adsorption capacity studies show that the best condition for adsorption process to take place was at bed temperature of 25°C and feed gas flow rate of 20 ml/min. The CO2 uptake was highest at this temperature and flow rate for piperazine impregnated activated carbon followed by the regenerated sample and non-impregnated activated carbon which were 145.42, 95.81, and 42.00 mg-CO2/g-adsorbent respectively. The regeneration recovery for the piperazine impregnated activated carbon was more than 65%

Characterization of impregnated commercial rice husks activated carbon with monoethanolamine (mea) and diethanolamine (dea) as potential co2 adsorbent

The studies characterization of impregnated activated carbon with monoethanolamine (MEA) and diethanolamine (DEA) as potential carbon dioxide (CO2) adsorbent was successfully performed. The adsorption capacity of the activated carbon can be increased by introducing the amine group on the surface of the adsorbent. MEA and DEA were selected as amino compounds for the binding process on the activated carbon surface. The synthesis of the impregnated activated carbon was prepared according to the concentration and mixture ratio. The physicochemical properties of the impregnated activated carbon were characterized by X-Ray Diffraction (XRD), Brunauer, Emmett and Teller (BET), Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FESEM). The XRD analysis was used to determine the type of compound presence on the activated carbon surface. The result reveals that the diffraction angles around 21.66º to 22.18º were linked for pyrazole, ethanolamine and diethanolamine which prove the presence of hydrocarbon and amine on the activated carbon surfaces. From the BET analysis, the total surface area and pore volume decreased with the increase of concentration of MEA and DEA. The presence of amide functional groups in FTIR analysis at 3288 cm-1 and 1651 cm-1 band for the impregnated activated carbon proved that there was a reaction occurs between carboxyl groups on the activated carbon surfaces with amine bonded. As for FESEM analysis, it was shown that the morphology of the non-impregnated activated carbon contains many pores on its surface while the pores on the impregnated activated carbon with MEA and DEA were filled with amines according to the selected concentration. The findings signify the high potential of CO2 adsorption capacity as the characterization results shows a positive feedback towards the quantity of MEA and DEA in the impregnated activated carbon sample

Preparation and Characterization of Impregnated Commercial Rice Husks Activated Carbon with Piperazine for Carbon Dioxide (CO2) Capture

Development of effective materials for carbon dioxide (CO2) capture technology is a fundamental importance to reduce CO2 emissions. This work establishes the addition of amine functional group on the surface of activated carbon to further improve the adsorption capacity of CO2. Rice husks activated carbon were modified using wet impregnation method by introducing piperazine onto the activated carbon surfaces at different concentrations and mixture ratios. These modified activated carbons were characterized by using X-Ray Diffraction (XRD), Brunauer, Emmett and Teller (BET), Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FESEM). The results from XRD analysis show the presence of polyethylene butane at diffraction angles of 21.8° and 36.2° for modified activated carbon with increasing intensity corresponding to increase in piperazine concentration. BET results found the surface area and pore volume of non-impregnated activated carbon to be 126.69 m2/g and 0.081 cm3/g respectively, while the modified activated carbons with 4M of piperazine have lower surface area and pore volume which is 6.77 m2 /g and 0.015 cm3/g respectively. At 10M concentration, the surface area and pore volume are the lowest which is 4.48 m2/g and 0.0065 cm3/g respectively. These results indicate the piperazine being filled inside the activated carbon pores thus, lowering the surface area and pore volume of the activated carbon. From the FTIR analysis, the presence of peaks at 3312 cm-1 and 1636 cm-1 proved the existence of reaction between carboxyl groups on the activated carbon surfaces with piperazine. The surface morphology of activated carbon can be clearly seen through FESEM analysis. The modified activated carbon contains fewer pores than non-modified activated carbon as the pores have been covered with piperazin

Investigation of impregnated commercial rice husks activated carbon with alkanolamine as carbon dioxide (CO2) adsorbent

The adsorption capacity of the activated carbon can be increased by introducing the amine group on the surface of the adsorbent. Modified rice husk activated carbon with different concentration and mixture ratio were prepared using wet impregnation method with alkanolamine. The adsorbents obtained were characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FESEM). From XRD analysis, the diffraction angles around 21.66° to 22.18° were linked for pyrazole, ethanolamine and diethanolamine which prove the presence of hydrocarbon and amine on the activated carbon surfaces. The presence of amide functional groups in FTIR analysis at 3288 cm-1 and 1651 cm-1 band proved that there was a reaction occured between carboxyl groups on the activated carbon surfaces with amine bond. For FESEM analysis, it was shown that the morphology of the non-modified activated carbon contains many pores on its surface while the pores on the modified activated carbon were covered with alkanolamines according to the selected concentrations