Determination of adsorption on activated carbon

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Asked at 2022-01-18 22:17:49

(1) The isotherm of adsorption and desorption of coconut-based activated carbon for domestic tobacco was determined by low temperature nitrogen adsorption method, BET method was used to calculate its specific surface area and pore volume, and density function theory was used to calculate its total pore distribution. The surface morphology of activated carbon was observed by scanning electron microscope. Finally, seven kinds of samples whose structural parameters meet the requirements of the experimental gradient are determined. The specific surface area of the sample ranges from 700-1400m2/g, and the particle size ranges from 40-60, 60-80 and 80-100 mesh. All the samples are dominated by micropores, and the percentage of micropores is more than 80%.old adsorption on activated carbon 

(2) determination of activated carbon to join before and after the join in cigarette smoke volatile) base material, phenolic compounds, 5 kinds of volatile organic compounds (1, 3 butadiene and isoprene, acrylonitrile, benzene and toluene) and aroma composition to release a quantity to change, discusses the structure, the nature of the compound, activated carbon and filtration efficiency of flue gas composition. The results show that the activated carbon has a general filtering effect on flue gas compounds, but the filtering degree of different compounds is different. The filtration efficiency is mainly related to the specific surface area and micropore volume of activated carbon. When the particle size is certain, the filtration efficiency increases with the increase of specific surface area and micropore volume of activated carbon. When the specific surface area and micropore volume are close to each other, the smaller the carbon particle size is, the higher the filtration efficiency of flue gas components is. Microporous high percentage of carbon retention ability of small molecules, of acetaldehyde, 1, 3 - butadiene and isoprene small molecule compounds, such as high filtration efficiency, high percentage and microporous carbon mass transfer resistance is big, such as phenolic half less volatile components of filtering, appropriately increase large and medium hole and transitional channel will increase the filtering of macromolecular compounds. The filtration efficiency was related to the properties of the compounds, especially the molecular weight and boiling point of the compounds. The filtration efficiency of volatile carbon substrate and 5 volatile organic compounds increased with the increase of the boiling point of the molecular weight of compounds. The filtration efficiency of phenolic compounds was significantly lower than that of volatile compounds) and five volatile organic compounds, and the filtration efficiency of binary phenol was lower than that of monophenol. The filtration efficiency of aromatic compounds decreased with the increase of molecular weight boiling point  


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