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研究论文

Characters of p-nitrophenol sorption in sediments--sorption isotherms and sorption thermodynamics

摘要：研究了对硝基苯酚在不同沉积物上的吸附等温线,比较分析了Linear方程、Freundlich方程和Langmuir方程描述吸附等温线的准确性和稳定性.结果表明,Linear方程更适合描述沉积物吸附对硝基苯酚的等温线.对硝基苯酚在沉积物上的吸附主要是溶质在沉积物有机质中的分配,其吸附热为-7.8kJ·mol^-1,主要的吸附作用力为疏水键力.对硝基苯酚在18个沉积物有机质上吸附自由能改变量为-5.4--7.2kJ·mol^-1.标准自由能的变小是对硝基苯酚在沉积物有机质上吸附的推动力

Abstract：The isotherm data of p nitrophenol to 18 sediments were studied. An evaluation of Linear, Freundlich and Langmuir equations on both accuratity and stability indicates that the Linear equation is the best. Sorption of p nitrophenol to sediment is dominated by the partition of solutes to sedimental organic matter. The influences of temperature on sorption of p nitrophenol to sediment was also investigated. The sorption parameters of thermodynamics, Δ H =-7.8kJ·mol^-1, suggest that the sorption behavior is dominated by dispersive force. The free energy changes of p nitrophenol sorption to 18 sedimental organic matter is in the range of -5.3-7.2kJ·mol^-1 . The sorption happened in sediment organic matter because of the decrease of free energy.