摘要
以兰炭粉为原料,水蒸汽为活化剂制备粉状活性炭。考察了水蒸汽流量、活化温度、活化时间、兰炭粉粒径对碘和亚甲蓝（MB）吸附值的影响。利用全自动吸附仪分析活性炭的比表面积和孔径分布,利用傅里叶变换红外光谱仪和X射线衍射仪对活性炭表面官能团和活性炭的微晶结构进行表征。实验结果表明：活化温度、活化时间、水蒸汽流量和原料粒度对活性炭的收率和吸附性能都有较大影响。当兰炭粉粒径尺寸为0.9~1.0 mm、活化温度为800℃、活化时间为180 min、水蒸汽流量为50m L/h时,制备活性炭的碘吸附值最高达到1 109.48 mg/g,比表面积为786.82 m2/g。制得的活性炭以微孔和中孔为主,而且具有多级孔的特征。相对于兰炭粉而言,活性炭含氧、含氮官能团数量增多。
Activated carbons with hierarchical pores were prepared based on semicoke powder by steam activation in this work. The influences of steam flow, activation temperature, activation time and semicoke size on the iodine value and methylene blue （MB） value of the obtained activated carbons were investigated. The nitrogen adsorption-desorption isotherm and pore size distribution of the activat- ed carbon were analyzed by BET, and the function groups and microcrystalline of activated carbon were analyzed by FT-IR spec- troscopy and X-ray diffraction, respectively. The results show that activation temperature, activation time, steam flow and semicoke size have a great impact on the yield and adsorption properties of the activated carbon. When the semicoke powder size was 0.9-1.0 mm, activation temperature was 800 ℃, activation time was 180 min and steam flow was 50 mL/h, the iodine value and BET surface area of resultant activated carbon achieved 1109.48 mg/g and 786.82 m2/g, respectively. The pore size calculation results show resultant acti- vated carbons have hierarchical pores, in which the micropores and mesopores are the main part. FT-IR spectra indicated that the number of oxygen, nitrogen functional groups of activated carbon increased compared with that of semicoke powder.
出处
《炭素技术》
CAS
北大核心
2015年第2期31-35,45,共6页
Carbon Techniques
基金
辽宁省教育厅项目(12013124)
辽宁科技大学专项基金(2012YY03)
关键词
兰炭粉
活性炭
水蒸汽活化法
碘吸附值
比表面积
Semicoke powder
activated carbon
steam activation
iodine value
specific surface area
