滨海旱作盐化潮土铵氮吸附特性研究

发布时间：2018-02-28 18:12

本文关键词： 吸附铵氮盐化潮土动力学热力学　出处：《环境科学与技术》2017年09期 　论文类型：期刊论文

【摘要】：苏北滨海地区盐碱性土壤通过耕作措施进行了长期改良,探讨铵氮在该类型土壤中的吸附特性对防控盐碱土区域氮素流失风险具有重要意义。选取苏北平原滨海地区典型盐化潮土,开展了铵氮吸附特性室内模拟研究,描述吸附等温过程,探讨初始浓度和p H的影响,揭示铵氮吸附的动力学和热力学特征。结果表明:铵氮平衡吸附变化满足Langmuir吸附等温式,以单分子层电性吸附模式为主;吸附过程符合Elovich方程;溶液初始浓度越大、p H越高、温度越低,铵氮吸附量越大,但吸附速率降低;热力学参数估算显示该吸附是放热过程,初始浓度增加,吸附需克服的能垒越高。
[Abstract]:The salt-alkaline soil in the coastal area of northern Jiangsu has been improved through tillage measures for a long time. It is important to study the adsorption characteristics of ammonium nitrogen in this type of soil for preventing and controlling the risk of nitrogen loss in saline and alkali soils. The laboratory simulation study on the adsorption characteristics of ammonium nitrogen in typical salinized tidal soils in the coastal area of northern Jiangsu Plain was carried out. The adsorption isothermal process was described, the effects of initial concentration and pH were discussed, and the kinetics and thermodynamics of ammonium nitrogen adsorption were revealed. The results showed that the equilibrium adsorption of ammonium and nitrogen was in accordance with the Langmuir adsorption isotherm, and the single layer electroadsorption model was the main one. The adsorption process accords with the Elovich equation, the higher the initial concentration of solution is, the higher the temperature is, the higher the adsorption rate of ammonium nitrogen is, but the lower the adsorption rate is, and the thermodynamic parameter estimation shows that the adsorption process is exothermic, and the initial concentration increases. The higher the energy barrier to be overcome by adsorption.
【作者单位】：首都师范大学资源环境与旅游学院资源环境与地理信息系统北京市重点实验室;北京师范大学环境学院;环保部环境规划院;
【基金】：国家自然科学基金(41301529,41471396,41601581) "十二五"国家科技支撑计划(2015BAC02B02)
【分类号】：S156.42

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