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Study on CO2 Adsorption with Activated Carbon Alkaline Cleaned and Modified under Ultrasonic Condition
Fubao Zheng, Rongying Lin, Pan Yang   2016/12    

In this experiment, coconut shell activated carbon particles were used as the carriers, the activated carbon particles alkaline cleaned and modified under ultrasonic condition were used for the adsorption of CO2 gas. This paper focuses on the influences of alkaline agent concentration and ultra- sonic time in the process of alkaline cleaning of activated carbon, and the influences of the stirring time, ultrasonic time and modifying agents in the process of modification of activated carbon. The alkaline cleaned and modified activated carbon particles were characterized by TGA and ASAP2020. The results show that the adsorption capacity of CO2 gas of the modified activated carbon particles was 1.5 mmol·g-1 when the alkaline cleaning conditions were KOH solution of 5 mol·L-1 and ultrasonic time of 120 min, and the modified conditions were stirring time of 30 min, ultrasonic time of 100 min, and 10% (mass fraction) potassium carbonate as modifier. Research shows that ultrasound could promote the dispersion effect of alkaline agent on activated carbon pore, so that the pore cleaning effect on activated carbon would be enhanced. Besides, modifiers were distributed in pores very well by ultrasound, thus the adsorption performance of modified activated carbon particles for CO2 gas could be improved. However, when ultrasonic time was too long in the process of modification, the pore would be collapsed and broken into small particles, and then the adsorption property declined. 

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