化工环保2024，Vol.44Issue(2)：205-212,8.DOI:10.3969/j.issn.1006-1878.2024.02.007
粉煤灰基沸石分子筛对水中氨氮的吸附
Adsorption of ammonia nitrogen in water by fly ash based zeolite molecular sieve
摘要
Abstract
Three zeolite molecular sieves were prepared using fly ash as the raw material through an alkali fusion-hydrothermal method,and characterized by XRD,XRF,SEM,and BET methods.These molecular sieves were used to adsorb ammonia nitrogen from solutions,and the main factors affecting the adsorption efficiency,isothermal adsorption characteristics and adsorption kinetics of ammonia nitrogen were investigated.The experimental results show that:The zeolite molecular sieve B(Na20.8Al23Si36O117·7.69 H2O)exhibits the best adsorption performance,and under the conditions of initial ammonia nitrogen mass concentration 100 mg/L,molecular sieve B addition 2 g/L,pH 7,temperature 25℃,rotation speed 50 r/min,and adsorption time 60 min,the adsorption amount and removal rate of ammonia nitrogen are 40.61 mg/g and 90%,respectively;The order of influence of 4 cations on the adsorption of ammonia nitrogen is K+>Ca2+>Na+>Mg2+;The adsorption of ammonia nitrogen by molecular sieve B is a single-layer adsorption with chemical adsorption characteristics.The optimal process conditions for the adsorption of ammonia nitrogen by molecular sieve B are solution pH 7,temperature 45℃,and initial ammonia nitrogen mass concentration 40 mg/L.Under these conditions,the removal rate of ammonia nitrogen is 93%.关键词
粉煤灰/沸石分子筛/氨氮/吸附Key words
fly ash/zeolite molecular sieve/ammonia nitrogen/adsorption分类
资源环境引用本文复制引用
陈晓冉,李睿羚,俞昊君,王艾,康巧玲,严立京..粉煤灰基沸石分子筛对水中氨氮的吸附[J].化工环保,2024,44(2):205-212,8.基金项目
浙江省大学生科技创新活动计划暨新苗人才计划项目(2023R409020). （2023R409020）
