Synthesis And Aplication Research Of Hierarchical Biomass-based Carbon

Hierarchical porous carbons as a novel carbon material have received widespread attention by researchers in recent years.Its advantages of different scales of the porosities can overcome the shortcomings of porous carbons with single channel.Hierarchical micro-and mesoporous carbons combining the characteristics of microporous and mesoporous structure have been widely used in many fields due to their extended specific surface area,large pore volume,high mechanical strength,chemical inertness and excellent thermal stability.The main factor that caused the greenhouse effect is the sharp increase of CO2 in atmosphere,so the most direct and effective mean to solve this problem is to find the suitable adsorbent.In this thesis,the hierarchical porous carbons were synthesized by simple method,and were investigated on the CO2 adsorption after optimizing progress.Hierarchical porous carbons were synthesized by using SBA-15 as hard template through multistep method.The effects of impregnation times,carbonization temperature and carbonization time for the structure of mesoporous carbon were investigated.Hierarchical porous carbons were synthesized by CO2 activation for mesoporous carbons in optimum synthesis conditions.And the influences of activation time along with the activation temperature for structure and CO2 capture of materials were investigated.The results showed that hierarchical porous carbon had optimal pore texture under twice impregnation,carbonization temperature of 900? and carbonization time of 4 h.After activated at 900? for 4 h on optimal mesoporous carbon,its specific surface area,total pore and volume and CO2 adsorption were up to 2124.9 m2/g,2.27 cm3/g and 3.41 mmol/g,respectively.Hierarchical porous carbons were synthesized by using F127 as soft template through one-pot method.The effects of hydrothermal temperature,amount of F127 adding,carbonization temperature and amount of TEOS adding for the structure of hierarchical porous carbon were investigated.The results showed that the hydrothermal temperature of 130?,0.5 g F127,carbonization temperature of 800? and 11 mL TEOS were the optimum synthetic conditions.After the optimal carbon were activated,the results showed that its specific surface area,total pore and volume and CO2 adsorption increased from 1574.2 m2/g,1.19 cm3/g and 2.32 mmol/g to 2437.6 m2/g,2.17 cm3/g and 3.60 mmol/g at 900? for 4 h.Hierarchical porous carbons were synthesized by using DDAC as soft template through one-pot method.The effects of hydrothermal temperature,amount of DDAC adding,amount of TEOS adding and carbonization temperature for the structure of hierarchical porous carbon were investigated.The results showed that hydrothermal temperature of 110?,1.0 g DDAC,carbonization temperature of 700? and 9 mL TEOS were the optimum synthetic conditions.After the optimal carbon were activated,the results showed that its specific surface area,total pore and volume and CO2 adsorption increased from 1704.0 m2/g,1.09 cm3/g and 2.11 mmol/g to 2526.6 m2/g,1.87 cm3/g and 3.54 mmol/g at 900? for 4 h.