摘要
以电解锰渣为原料,经过“弱酸除杂-碱融活化-室温陈化-晶化”水热合成反应体系,在分别外加铝源和硅源的条件下制备方沸石ANA-A及ANA-S,运用XRF、XRD、SEM-EDS和BET等表征手段对2种方沸石的化学组成、晶相结构、微观形貌和比表面积进行分析。结果表明:在煅烧温度750℃、合成温度180℃、水热反应时间8 h的条件下,外加铝源和硅源均可合成方沸石。进一步研究2种沸石对水溶液中Pb^2+的静态吸附性能,其所合成的电解锰渣基ANA-A及ANA-S方沸石均可以很好地用Langmuir等温模型拟合,属于单分子层吸附,饱和吸附量分别为161.29,185.19 mg/g,对初始浓度为100 mg/L的Pb^2+去除率分别为93.69%和95.47%,且均符合Lagergren准二级动力学模型,属于化学吸附;两者中ANA-S的吸附效果更好。
With electrolytic manganese slag as raw material,after the weak acid complexing,activation of alkali-melt,aging at room temperature and crystallization of hydrothermal synthesis system,analcite ANA-A and ANA-S was prepared by adding aluminum and silicon respectively.Performance of the two kinds of analcime such as chemical composition,crystal phase structure,microstructure,and specific surface area were analyzed by using characterization methods of XRF,XRD,SEM,EDS and BET.The results showed that the analcite could be successfully synthesized with both the addition of aluminum and silicon at the calcination temperature of 750℃,the synthesis temperature of 180℃,and the hydrothermal reaction time of 8 h.Further study on two kinds of zeolite Pb^2+ in aqueous solution of static adsorption showed that ANA-A and ANA-S could fitting Langmuir isotherm model well,accorded to the monolayer adsorption.Their saturated adsorption capacity were 161.29 mg/g and 185.19 mg/g,and the initial concentration of 100 mg/L of Pb^2+ removal rate reached 93.69% and 95.47% respectively,comlied with the lagergren quasi-second order kinetics model,and were defined as chemical adsorption.ANA-S has better adsorption effect between the two adsorbers.
作者
曾越
李徐立
陈宇驰
万沙
周旻
侯浩波
ZENG Yue;LI Xu-li;CHEN Yu-chi;WAN Sha;ZHOU Min;HOU Hao-bo(School of Resource and Environment Science,Wuhan University,Wuhan 430072,China;Provincial Engineering Research Center for Environmental Remediation Materials,Wuhan University,Wuhan 430079,China)
出处
《环境工程》
CAS
CSCD
北大核心
2020年第11期175-179,186,共6页
Environmental Engineering
关键词
电解锰渣
水热合成
方沸石
Pb^2+吸附
electrolytic manganese slag
hydrothermal method
analcite
Pb^2+adsorption
