广东省典型城市湖泊沉积物氨氮吸附特性初步研究

研究了广州及其周边典型城市湖泊沉积物对氨氮的吸附等温线及热力学参数,结果表明：该类沉积物对氨氮的吸附等温线同时满足Langmuir模型、Freundlich模型、Linear模型,其拟合的程度都达到了极其显著的效果。根据Langmuir模型计算,流花湖、逸仙湖和荔弯湖三湖泊沉积物对氨氮的吸附容量分别为500 mg/kg、416.66 mg/kg、357.14 mg/kg。以流花湖沉积物为代表研究其吸附热力学参数,结果发现氨氮的吸附过程是一个微型的放热过程。该湖泊沉积物吸附热为-5.05 kJ/mol,其吸附自由能的改变量为-967.467 J/mol。从其热力学的角度对其吸附机理做了初步的探讨。

Preliminary Study on Adsoption of Ammonia Nitrogen on Sediments from the TyPical Lakes of Guangzhou Province

Sorption isotherms of Gummonium and adsorption thermodynamics parameter on surface sediments taken from the typical lakes of Guangzhou along were determined in laboratory.The results indicated that adsorption isotherms curves were fitted to Langmuir equation Freundlich equation as well as Linear equation.Based on Langmuir equation calculation,liuhua、yixi and liwuan lakes adsorption capacities were 500 mg/kg 、416.66 mg/kg 、357.14 mg/kg.Liuhua lake as adsorption thermodynamics paramete type,which indicated that ammonium is exothermic reaction.The sorption parameters of thermodynamics was-718 kJ/mol,the free energy changes of ammonium was-967.467J/mol.Also,the mechanism of adsorption was disussed from the perspecives of thermodynamics.