摘要
以邻、间、对甲酚为模拟废水,考察甲基的取代位置对吸附和解吸特性的影响,并以此评价活性炭吸附-生物再生工艺处理甲酚废水的可行性.平衡数据经Freundlich模型拟合后表明,活性炭(AC)对3种甲酚的吸附能力由大到小的顺序为:对甲酚>邻甲酚>间甲酚,与pKa呈正相关,与可溶性和氧化电极电位呈负相关;解吸能力由大到小的顺序为:邻甲酚>间甲酚>对甲酚,与沸点和黏度呈负相关.此外,对比吸附和解吸平衡曲线,发现吸附不可逆性是两曲线差异的重要原因,并结合数理统计的方法推导出理论不可逆吸附量的计算方法,得到AC对邻、间、对甲酚的不可逆吸附量Qi分别为27.9、28.5、33.4 mg/g.
Simulated wastewater containing o-, m- and p-cresol was used respectively to study the effects of substituted position on adsorption and desorption and the feasibility of activated carbon adsorption-bioregeneration treatment. According to the isotherm, the adsorbability sequences in the order of p-cresol 〉 o-cresol 〉 m-cresol, which is positively correlated to pKa and negatively correlated to solubility and critical oxidation potential （COP）; and the desorbability sequences in the order of o-cresol 〉 m-cresol 〉 p-cresol, which is negatively correlated to boiling point and viscosity. According to comparative analysis, irreversible adsorption is found to be the main reason for differences between adsorption and desorption isotherms. A mathematical statistics method was applied to estimate the amount of irreversible adsorption. The irreversible adsorption amounts of o, m, p-cresol are 27.9 mg/g, 28.5 mg/g and 33.4 mg/g, respectively.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第6期1744-1748,共5页
Environmental Science
关键词
甲酚
异构体
活性炭
吸附
解吸
cresol
isomers
activated carbon
adsorption
desorption
