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利用入侵植物加拿大一枝黄花为原料,采用在400℃氮气保护下,直接碳化90 min后,选择KOH为活化剂,微波活化的方法制备活性炭。研究了不同的KOH/C比值、微波功率及活化时间对活性炭吸附量及产率的影响。结果表明,最优活化条件为碱碳比2 g/g、微波功率700 W及微波辐射6 min,此时活性炭的亚甲基蓝吸附值、碘吸附值、活化产率和表面积分别为302.4 mg/g、1 470.27 mg/g、53.75%和1 888 m2/g。采用热重分析研究加拿大一枝黄花的碳化过程,分别使用氮气吸附-脱附、扫描电镜(SEM)和傅立叶红外光谱法(FT-IR)表征了活性炭的孔结构特征、表面结构及表面官能团。
Using the invasive plant Solidago canadensis as raw material, activated carbon was prepared by microwave activation after direct carbonization at 400 ℃ under nitrogen for 90 min. The effects of different KOH / C ratio, microwave power and activation time on the adsorption capacity and yield of activated carbon were studied. The results showed that the optimal activation conditions were as follows: alkali-carbon ratio 2 g / g, microwave power 700 W and microwave irradiation 6 min. At this time, methylene blue adsorption, iodine adsorption, activation yield and surface area of activated carbon were 302.4 mg / 1 470.27 mg / g, 53.75% and 1888 m2 / g. The carbonization process of Solidago canadensis was studied by thermogravimetric analysis. The pore structure, surface structure and surface functional groups of activated carbon were characterized by nitrogen adsorption-desorption, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR).