摘要
研究了天然沸石对氨氮的吸附性能,实验结果表明:天然沸石在去离子水、自来水和生活污水中,对氨氮的吸附符合Langmuir和Freundlish吸附等温方程,天然沸石吸附氨氮的焓变为-16.21kJ/mol,温度对于天然沸石吸附氨氮的影响不大,天然沸石吸附氨氮同时受液膜扩散和颗粒内扩散的影响,在高初始氨氮浓度的情况下,颗粒内扩散是吸附的主要控制因素,在共存阳离子浓度为50mg/L的条件下,共存阳离子对吸附过程的影响不大,相应的影响顺序为:K+>Ca2+>Na+>Mg2+。
The adsorbability for ammonia-nitrogen on natural zeolite was studied.The result showed that in the de-ionized water,tap water and sanitary waste water,both Langmuir and Freundlish models could simulate the equilibrium adsorption data of ammonia on natural zeolite,the enthalpy difference of adsorption was-16.21kJ/mol,the effect of temperature was little.The adsorption of ammonia on natural zeolite was both influenced by fluid film diffusion and intraparticle diffusion,the intraparticle diffusion was the main controlling factor in high initial ammoniac concentration.In the condition of initial competing cations concentration 50mg/L,the effect of competing cations were little in the adsorption of ammonia on natural zeolite,the corresponding sequence was K+>Ca 2+ > Na+> Mg 2+.
出处
《环境工程》
CAS
CSCD
北大核心
2009年第S1期171-173,共3页
Environmental Engineering
基金
国家"863计划"项目(2003AA601020)
上海科委重大项目(02DZ12099)
关键词
沸石
吸附
氨氮
zeolite
adsorption
ammonia nitrogen
