摘要
采用氢氧化钠对麦饭石进行改性,考察了改性麦饭石投量、pH值、吸附时间和吸附温度对水中氨氮吸附效果的影响。对其吸附等温曲线进行了分析,并通过扫描电子显微镜(SEM)、比表面积(BET)和X射线衍射(XRD)表征方法对改性麦饭石的吸附机理进行了探究。结果表明:改性麦饭石对水中氨氮的去除效果远远优于天然麦饭石,对50mL的氨氮质量浓度为5mg/L废水中氨氮的去除率高达86.6%;Freundlich吸附等温方程能更好地描述改性麦饭石对水中氨氮的吸附行为;SEM和BET表征结果证明了该改性方法有效增大了麦饭石的比表面积及总孔体积;XRD表征结果证明了废水中的氨氮附着在改性麦饭石上,其反应机理不仅包括物理作用还包离子交换作用。
Maifan stone was modified by sodium hydroxide.The effect of the dosage of modified clinoptilolite,the value of pH,the contact time and temperature on simulated wastewater were investigated.Analyzing the adsorption isotherm,and through SEM,BET and XRD,the adsorptive capability of maifan stone in removing ammonium was investigated.The results showed that the modified maifan stone can effectively improve the adsorption ion capacity of natural maifan stone.Dealing with 50 mL simulated wastewater with total ammonium 5mg/L,the removal rate reached at 86%.Freundlich equation was better in describing the behavior of ammonium adsorption on modified maifan stone.SEM and BET results showed that this modified method effectively increased the specific surface area and total pore volume of maifan stone.XRD results demonstrated that phosphorus appeared on the surface of modified maifan stone and the reaction mechanism involved not only had the physical effects also included ion exchange.
出处
《化工新型材料》
CAS
CSCD
北大核心
2017年第9期166-168,共3页
New Chemical Materials
基金
国家水体污染控制与治理科技重大专项(2014ZX07105-001)
关键词
麦饭石
改性
吸附
氨氮
机理
maifan stone
modification
adsorption
ammonium
mechanism
