【摘要】 以玉米秸秆为原料,在不同热解条件下制备活性炭,再运用BET模型和Boehm滴定法测定活性炭孔隙结构和表面性质,并选取性能较优的活性炭进行NaOH改性,研究其改性前后对甲醛的吸、脱附性能和表面结构与表面化学性质变化。结果表明:在最优热解参数60 min、650℃制备的玉米活性炭经NaOH改性后可使其对甲醛饱和吸附时间延长62%,饱和吸附量提高133.33%,比表面积增加3.02%,微孔容积增大0.6%,脱附峰面积和峰高明显增大,且其表面碱、酸性官能团含量分别提高了11.85%、5.51%,说明NaOH改性能提高活性炭的表面碱、酸性官能团含量,增大活性炭比表面积与孔径,从而提高其对甲醛等极性物质的吸附能力。更多还原

【Abstract】 Activated carbons(AC) were prepared using corn stalk as raw material at different pyrolysis conditions. The surface structure and property of the activated carbon were studied by BET model and Boehm titration. Then the optimized AC(ACN) was selected and modified by NaOH, and toluene adsorption and desorption capacity of AC and ACN were compared. The results showed that the optimized pyrolysis parameters were as following:time of 60 min and temperature of 650 ℃.It was found that the saturated absorption time of ACN for formaldehyde was prolonged by 62%, the saturated absorption capacity was increased by 133.33%, the specific surface area was increased by 3.02%, and micropore volume was increased by 0.6%. And desorption peak area and peak height were increased obviously,the content of the surface basic functional groups were increased by 11.85% and surface acidic functional groups were increased by 5.51%. It is indicated that the content of the surface basic functional groups, pore size and specific surface area of ACN were increased, and the adsorption capacity was also increased by NaOH modification.更多还原