摘要
采用KOH活化废弃的咖啡渣制备活性炭,在相同碱炭比(3∶1)、相同炭化温度(450℃)条件下,采用高温800~900℃,对样品进行80~100 min的活化操作,制备出3种活性炭材料,根据N2吸附等温线及BET法分析,其比表面积,分别为1 500,1 675,2 111 m^2/g。采用扫描电镜(SEM)、BJH理论分析得到的3种样本的吸附特性及孔结构特征,咖啡渣活性炭表面孔结构变化为:由表面中孔及微孔转变成大孔骨架-中孔、大孔骨架-微孔系统结构,3种活性炭样品平均孔径分别为2.508,2.267,1.926 nm。咖啡渣含碳量较高,达到57.23%,经过炭化活化后,含碳量最高为79.59%。利用FTIR光谱分析了样品所含官能团的变化情况。
Using KOH activation abandoned the coffee grouds of preparation of activated carbon. Three activated carbon samples were obtained under the same alkaline carbon ratio of 3 ∶ 1 and the carbonization temperature( 450 ℃) when the activation time was increased from 80 ~ 100 min and the activation temperature was increased from 800 ~ 900 ℃. The specific surface areas of the activated carbon samples were1 500,1 675,2 111 m^2/g according to N2 adsorption isotherm and BET theoretical analysis. Changes in surface structure of the samples were from mesopores and micropores to macroporous skeletons-mesopores or macroporous frameworks-macroporous system structures,detected by scanning electron microscopy( SEM) and BJH theoretical analysis. And the average particle size of three activated carbon solids were2. 508,2. 267 nm and 1. 926 nm. The carbon content of the coffee residue reached 57. 23%,and the highest carbon content of samples is 79. 59% after carbonization and activation. The FTIR spectra was used to detect the changes of oxygen-containing functional group.
出处
《应用化工》
CAS
CSCD
北大核心
2017年第12期2412-2415,共4页
Applied Chemical Industry
基金
国家自然科学基金(51322304)
关键词
活性炭
咖啡渣
KOH
孔结构
比表面积
activated carbon
coffee grounds
KOH
pore structure
specific surface area
