甲酚异构体在活性炭上的吸附与解吸平衡特性

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pK_a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.

Characteristics of Adsorption and Desorption Isotherm of Cresol Isomers on Activated Carbon

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 pK_a and negatively correlated to solubility and critical oxidation potential(COP);and the desorbability sequences in the order of o-cresol>m-cresol>p-creso...