摘要
研究了介孔碳CMK-3对苯酚的吸附性能,与传统商用活性碳(CAC)进行了比较,结果表明,CMK-3比CAC的吸附量大、吸附速率快、达到平衡时间短,是一种较好的吸附剂.同时探讨了介孔碳CMK-3对苯酚的吸附热力学和动力学特征.CMK-3对苯酚的吸附行为可用Langmuir和Freundlich等温式进行描述,相关性都较好,但更符合Freundlich经验公式.分别采用模拟一阶反应和二阶反应模型考察了吸附动力学,并计算了这些动力学模型的速率常数.模拟二级反应模型和实验数据之间有较好的相关性.分别计算了热力学参数ΔG0,ΔS0和ΔH0,结果表明,CMK-3对苯酚的吸附过程是吸热和自发的.
Mesoporous carbon CMK-3 was used to adsorb phenol from water by comparing its adsorption ability with commercial spherical activated carbon（CAC）. CMK-3 had a higher adsorption capacity and faster adsorption rate than CAC. The adsorption property of phenol onto the mesoporous carbon CMK-3 was discussed from the thermodynamic and kinetic viewpoints. The adsorption parameters for Langmuir and Freundlich isotherm models were determined for CMK-3. Both isotherms were suitable models to analyze the equilibrium data for the phenol adsorption. However, the Freundlich model fitted better than the Langmuir model. The adsorp- tion kinetics was tested with the pseudo-first-order and pseudo-second-order reaction model. The rate constants of adsorption for these kinetics models were calculated. The pseudo-second-order kinetic model provided the best correlation of the experimental data compared to the pseudo-first-order model. The thermodynamic constants of the adsorption process △G^0, AS^0 and △H^0 were evaluated. These show that adsorption of phenol on CMK-3 was endothermic and spontaneous.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期289-292,共4页
Chemical Journal of Chinese Universities
基金
辽宁省教育厅2004年度高等学校科学研究项目计划(批准号:2004D073)资助
关键词
介孔碳
苯酚
吸附动力学
吸附热力学
CMK-3
Phenol
Adsorption kinetics
Adsorption thermodynamics
