Preparation of EG/CPDA Composites and Their Adsorption of Benzene Gas
Expanded graphite/carbonated polydopamine(EG/CPDA)composites were prepared by an in situ impregnation activation process using dopamine hydrochloride as the carbon source,and the EG/CPDA composites were characterized using scanning electron microscopy,nitrogen adsorption and desorption apparatus,Fourier transform infrared spectroscopy,etc.The formation mechanism of CPDA microporous adsorption structure was investigated,and the effects of alcohol-to-water ratio,ammonia concentration,The effects of alcohol-water ratio,ammonia concentration,KOH ratio and carbonization activation sequence on the microstructure and the adsorption performance of benzene gas were investigated.The results showed that the EG/CPDA composites retained the virtual pore channels of carbonized PDA,architected a graded porous carbon material with permeable micron-level macropores and abundant nanometer-level micropores;when the alcohol-to-water ratio was 1∶2,ammonia amount was 0.4 g,it was pre-carbonated at 800℃for 2 h,mixed with KOH at 1∶4 and activated at 700℃for 1 h,the specific surface area and total pore volume could reach 1 291 m2·g-1 and 1.28 cm3·g-1,and the adsorption capacity of benzene gas could reach 1 303 mg·g-1.Moreover,the sp2 C/N enriched surface was expected to improve the competitive adsorption of benzene gas to water vapor.
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