【作者】 李岩梅； 崔洪友；

【Author】 Li Yanmei;Cui Hongyou;Institute of Chemistry and Chemical Engineering,Shandong University of Technology;

【机构】 山东理工大学化学化工学院；

【摘要】 采用玉米秸秆快速热裂解制生物油后的固体残渣(生物炭)为原料,以2 mol/L NaOH水溶液为活化改性剂,考察了不同焙烧温度对生物炭改性效果的影响,结果表明700℃焙烧的效果最好,制得的炭材料BET表面积可为389.4921 m~2/g,总孔容为0.4943 cm~3/g,存在大量的微孔和介孔。与改性前相比,比表面积增加了160倍和总孔容增加了近120倍。改性生物炭吸附水中的亚甲基蓝表明,25℃时亚甲基蓝的吸附量为238.35 mg/g,随着温度的升高,炭材料的吸附量增加,吸附过程是吸热过程;p H值为2~10时,p H值的增加,炭材料的单位吸附量也相应增加。等温吸附符合Langmuir模型,单层最大吸附能力为333.33 mg/g。吸附动力学符合准二级动力学模型。更多还原

【Abstract】 Using biochar that is a solid residue produced in fast pyrolysis of corn stalk towards bio-oil,as the raw material,2 mol/L NaOH solution as the activation agent,the effect of calcination temperature on the modification of biochar is investigated. It is found that 700 ℃ is the appropriate temperature, under which the prepared modified biochar is389. 4921 m~2/g in BET surface area and 0. 4943 cm~3/g in pore volume,respectively,with micorpores and mesopores. The BET surface area and pore volume increase 160 and 120 times more than before,separately. The adsorptive properties of the modifiedbio-char are surveyed by methylene blue adsorption in aqueous solution. The experimental results indicated that the adsorption capacity under 25 ℃ was about 238. 35 mg/g,and increased with adsorption temperature gradually. As p H increased from 2 to 10,the adsorption capacity also increases. The adsorption isotherm experiment data is well in agreement with Langmuir model, with the maximum monolayer adsorption capacity of 333. 33 mg/g. Adsorption kinetics was in accordance with the quasi two-order dynamic model.更多还原