摘要
采用静态吸附实验研究苯酚在活性炭上的吸附热力学及动力学行为。采用预处理后的活性炭吸附苯酚,吸附过程遵守二级动力学方程,最大吸附量为0.276 1 g/g。吸附热为23.89 kJ/mol,吸附键强度较小,一个苯酚分子通过氢键吸附在活性炭界面两个活性点上;随着苯酚引入量的增加,红外光谱在3 432 cm 1的羟基谱线由尖逐渐变宽,出现弥散光谱,由此推测出苯酚通过羟基上的氢键发生缔合。综合所得数据提出活性炭吸附苯酚的模型,并圆满解释相关的实验现象。
The dynamics and thermodynamics of activated carbon adsorbing phenol were investigated by static adsorption experiments. The adsorption process obeys the second-level dynamic equation, where the pretreatment activated carbon is used to adsorb phenol. The maximum adsorption capacity is 0.276 1 g/g. The experimental results deduced from the adsorption thermodynamics computation and the infrared spectrogram shows that the adsorption heat is -33.046 kJ/mol, the adsorption bond strength is small, and a phenol molecule adsorbs on two active points of activated carbon surface via hydrogen bond. With the increase of phenol dosage, the infrared spectrum broadens gradually on 3 432 cm-1 hydroxyl spectral line, the dissemination spectrum occurs, which indicates that phenol associates through hydrogen bond on hydroxyl. Adsorption model being built based to the obtained data could be used to explain the related experiment phenomena.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第10期2924-2929,共6页
The Chinese Journal of Nonferrous Metals
基金
国家杰出青年科学基金资助项目(50925417)
国家自然科学基金重点项目(50830301)
湖南省研究生科研创新项目(CX2010B121)
关键词
苯酚
活性炭
吸附模型
phenol
activated carbon
adsorption model
