摘要
作者在298、308和318 K下,利用动力学、等温线模型和吸附热力学研究了粉煤灰对水溶液中硝基苯的吸附过程。结果表明:此吸附过程更符合拟二级动力学模型,受边界层扩散和粒内扩散共同控制;吸附活化能(Ea)为27.75 kJ/mol;此吸附过程较符合Sips和Langmuir模型,吸附性能良好;吸附热力学参数分别为?G^0(-1.225^-2.760 kJ/mol)<0、0<?H^0(22.07 kJ/mol)<40 kJ/mol和?S^0(20.62J/(mol·K))>0,显示此吸附为自发吸热过程。结合动力学模型、活化能、等温线模型和热力学参数,得出粉煤灰对硝基苯的吸附是物理吸附和化学吸附共同作用。
Adsorption process of flyash for the removal of nitrobenzene from aqueous media were investigated at 298,308 and 318 K,and the kinetics,isotherm and thermodynamics of the adsorption process were analyzed.The results showed that the adsorption process could be better characterized by the pseudo-second-order model than others.The adsorption process was controlled by both boundary layer diffusion and intraparticle diffusion.The adsorption activation energy was calculated to be 27.75 kJ/mol.Moreover,the adsorption isotherm curves of nitrobenzene by the flyash could be well described by Sips and Langmuir isotherm model,indicating a favorable adsorption performance.Furthermore,thermodynamics parameters were obtained as follow:?G^0(-1.225^-2.760 k J/mol)<0,0<?H^0(22.07 kJ/mol)<40 kJ/mol and?S^0(20.62 J/(mol·K))>0,respectively.The analysis of these thermodynamic parameters suggested that the process was spontaneous and endothermic.Combining the kinetic model,activation energy,isotherm model and thermodynamic parameters,it was concluded that the adsorption of nitrobenzene by flyash was physisorption and chemisorption coexisted.
作者
于波
于洪翠
宋邦雄
齐瑞雪
YU Bo;YU Hongcui;SONG Bangxiong;QI Ruixue(College of Chemistry and Materials Science,National Experimental Teaching Demonstration Center of Chemistry,Inner Mongolia Key Laboratory of Carbon Nanomaterials,Inner Mongolia Key Laboratory of Chemistry for Natural Products and Synthesis for Functional Molecules,Inner Mongolia University for Nationalities,Tongliao 028043,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第S01期11-16,共6页
Environmental Science & Technology
基金
内蒙古自然科学基金项目(2019BS02009)
内蒙古高等学校科学研究项目(NJZY20116)
内蒙古民族大学科学研究项目(NMDYB19050)
内蒙古民族大学博士启动项目(BS425)
