微波活化法制备加拿大一枝黄花活性炭及其性能表征
Preparation and characterization of activated carbon from Solidago Canadensis by means of microwave irradiation activation
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摘要: 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。
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关键词:
- 加拿大一枝黄花活性炭微波辐射氢氧化钾
Abstract: The activated carbons (ACs) was prepared from Solidago Canadensis,an alien invasive plant. The plant was firstly carbonized under nitrogen at 400℃ for 90 min,then the carbonized product was activated with KOH through microwave radiation.Effects of KOH/C ratio,microwave power and microwave radiation time on the adsorption capacities and yield of AC were evaluated. It indicated that the optimum conditions were the KOH/C ratio of 2 g/g,microwave power of 700 W and microwave radiation time of 6 min. The adsorption amount of methylene blue and iodine,the activation yield and the surface area of AC prepared from optimum conditions were 302.4 mg/g,1 470.27 mg/g,53.75% and 1 888 m2/g,respectively. The carbonation process of Solidago Canadensis was analyzed by TG and DTG. The pore structural parameters,surface structure and surface functional groups of the AC were characterized by nitrogen adsorption-desorption,SEM,FT-IR,respectively.-
Key words:
- Solidago Canadensis
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