天然沸石及改性沸石去除低浓度氨氮的研究

研究了天然斜发沸石在不同的酸、碱和盐改性条件下吸附去除氨氮（NH₄＋-N）的效果.结果表明:沸石吸附NH₄＋-N动力学曲线符合“快速吸附、缓慢平衡"的特点，且初始ρ（NH₄＋-N）越高，吸附速率越快；天然沸石及其改性沸石吸附NH₄＋-N为单分子层吸附过程，其吸附热力学曲线很好地符合Langmuir曲线. 沸石吸附NH₄＋-N是吸热反应，适当提高温度能够促进NH₄＋-N的吸附. 盐改性方法对沸石吸附NH₄＋-N的效果最好，增加了沸石的比表面积和总孔容，同时有利于沸石的再生. 

Study on Low Concentration Ammonia Nitrogen Removal by Natural and Modified Clinoptilolites

Ammonia nitrogen removal from synthetic aqueous solutions by natural and different modified clinoptilolites was investigated. The results show that the dynamic curves of ammonia nitrogen adsorption by natural and modified clinoptilolites fit the character of “fast adsorption and slow equilibration", and theiradsorption rates become higher with the initial concentrations of ammonia nitrogen increasing. Ammonia nitrogen adsorption by the natural and modified clinoptilolites fit the single molecule adsorption process, and Langmuir equation could well describe the isotherm adsorption. The adsorption reaction is endothermic process; therefore the adsorption capacity of clinoptilolite could increase when the temperature increased appropriately. The highest ammonia nitrogen adsorption efficiency was achieved by salt modified clinoptilolite because of the increase of surface area and cavity size, and salt modified method could also benefit thereuse of clinoptilolite.