自然水体生物膜对苯酚及对硝基苯酚的热力学吸附

利用长春南湖水体培养生物膜， 研究自然水体生物膜对苯酚及对硝基苯酚的吸附特性及pH值对生物膜吸附苯酚及对硝基苯酚的影响. 结果表明， Freudlich方程、 Langmuir方程均能较好地描述生物膜对苯酚及对硝基苯酚的吸附. 生物膜吸附苯酚、 对硝基苯酚的过程中表现出对酸、 碱的缓冲能力， 具有两性表面特性. 生物膜对苯酚的吸附在pH=5~9范围内， 随pH值的升高而增加， 生物膜对对硝基苯酚的吸附随pH值的升高而减小. 溶液中pH值的变化， 改变了酚类化合物的存在形态， 从而影响生物膜对酚类的吸附.

Characteristics of Thermodynamic Adsorption of Phenol and p-Nitrophenol onto Natural Surface Coatings

The adsorption characteristics of phenol and p-nitrophenol onto natural surface coatings(biofilms and associated minerals,collected in the Nanhu Lake,Changchun,China) and the effect of pH on phenol and p-nitrophenol adsorption onto natural surface coatings were examined.The results show that Freundlich and Langmuir models are all fit in with describing the adsorption behavior of phenol and p-nitrophenol on natural surfaces coatings.During the adsorption procedure,surface coatings showed amphoteric properties and can buffer the acids or alkalis in the solution.With pH from 5 to 9,the sorption amount of phenol increased with increasing pH,however,the sorption amount of p-nitrophenol decreased with increasing pH.The variety of pH in solution could affect the species and adsorption of phenol and p-nitrophenol.