Abstract
In order to provide protection against extremely toxic gases, activated carbon (AC) adsorption has long been regarded to be a useful technology in terms of gas removal. AC without chemical impregnation has been considerably less effective than impregnated ACs. AC in present use was modified with an organic amine, i.e., triethylenediamine (TEDA) to enhance the physical and chemical properties of AC in order to remove specific poisonous gases. With the rising concern on environmental pollution, there has been an increased curiosity in ACs as the means for eliminating pollutants from environment. Purpose of this study was to assess the TEDA impregnated AC in terms of adsorption capability for simulant gas like SO2. Analysis was done in a properly designed setup. By using the scheme reported here, significant adsorption of toxic gas was obtained. Maximum removal capability observed by AC-4 for SO2 gas was 374 mg/g-C and its breakthrough time was 264 min. Breakthrough time and adsorption capacity of AC-4 was found to be 25 times and 10 times greater as compared to raw AC. Different characterization techniques were also used to study impregnated AC. It was found that chemical adsorption was the crucial means by which TEDA-impregnated AC removed the simulant gas. Langmuir model was best to represent equilibrium, and adsorption kinetics follow second-order model. The process was endothermic, favorable, and spontaneous.
Highlights
Due to high adsorptive properties of Activated Carbon (AC), it has been employed in a huge range of applications as an easy and safe technique for eliminating contaminants from air stream and from water as well.Of the many carbonaceous materials, activated carbon has gained this special property
Results clearly indicate that AC-4 showed an enhancement in properties as compared to the Raw AC
We can say that the prepared AC-4 sample might be a sustainable candidate for purification of noxious gases from atmosphere
Summary
Due to high adsorptive properties of AC, it has been employed in a huge range of applications as an easy and safe technique for eliminating contaminants from air stream and from water as well. Of the many carbonaceous materials, activated carbon has gained this special property This is mainly because of porous nature and huge surface area of activated carbon which makes it functional for removal of irritating and toxic gases from the environment. Impregnating activated carbon (IAC) with warily chosen materials, significantly increases its capacity of adsorption for a large number of gases that raw activated carbon is unable to filter. This marvelous property of activated carbon has been used in the manufacturing of canisters and gas mask filters for the last few decades. Several impregnating materials i.e. diisopropylamine (DIPA), triethylenediamine (TEDA), piperidine, di-N-propylamine (DNPA), citric acid and tartaric acid have been used for contaminant removal. In addition to IACs, an un-impregnated activated carbon was tested for gas adsorption capacity
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