摘要
利用天然沸石的离子交换性对小粒径白银斜发沸石进行NaCl改性,以增强其对氨氮的吸附能力,并对改性沸石进行XPS,XRD等手段测试。吸附氨氮热力学实验表明,改性后沸石吸附氨氮的等温吸附线符合Langmuir吸附模型,并且从Langmuir方程拟合的数据可知,经改性的沸石对氨氮的饱和吸附量高于天然沸石。吸附氨氮动力学实验表明,天然沸石和Na型沸石吸附氨氮的速率可按一级反应处理,根据总速率常数值可知,改性沸石对氨吸附速率快。
Natural zeolite was modified by sodium chloride to enhance sorption capacity for ammoniacal nitrogen. The untreated and treated zeolite was characterized by XPS and XRD techniques. The sorption isotherm tests showed that equilibrium sorption data were better represented by the Langrnuir model than by the Freundlich model. Treatment of natural zeolite by sodium chloride increased the sorption capacity for ammoniacal nitrogen removal from aqueous solutions.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2013年第11期1537-1540,共4页
Chemical Research and Application
基金
2012年度甘肃省高等学校研究生导师科研项目(1212-04)
2011年度兰州城市学院博士科研启动金
关键词
斜发沸石
改性
氨氮
吸附
natural zeolite
modifieation
ammoniacal nitrogen
sorption
