摘要
采用NaOH对围场地区天然沸石进行处理,采用X射线衍射仪、红外光谱仪、N2吸附-脱附技术、扫描电子显微镜等对材料进行表征分析,采用水蒸气吸附法评价材料的亲水性,采用Cr3+和Mn2+评价材料的离子交换性能,探讨了碱处理对天然沸石的结构、亲水性和离子交换性能的影响及其机理。实验结果表明,围场地区天然沸石中主要含有斜发沸石、石英和伊利石;碱处理可降低天然沸石的硅铝比,且沸石的硅铝比随着碱处理浓度的提高而不断降低;碱处理对斜发沸石结构的影响较石英和伊利石更大;高浓度碱处理导致天然沸石的结构发生破坏,比表面积降低,孔体积提高;伴随着天然沸石硅铝比的降低,其亲水性和离子交换性能不断提高。
In this paper,the natural zeolites from Weichang area were treated with sodium hydroxide.X-ray diffractometer,infrared spectrometer,N2 adsorption-desorption technique and scanning electron microscope were employed to characterize the materials,water vapor adsorption method was adopted to evaluate the hydrophilicity of materials,and Cr and Mn ions were used to determine the ion exchange property of materials.The effect and the mechanism of alkali treatment on structure,hydrophilicity and ion exchange property of natural zeolites were then investigated.The results show that the natural zeolites from Weichang area contain clinoptilolite,quartz and illite.Alkali treatment could decrease the SiO_(2)/Al_(2)O_(3)ratio of natural zeolites,and the SiO_(2)/Al_(2)O_(3)ratio gradually decreases with the increase of alkali concentration.The influence of alkali treatment on structure of clinoptilolite is higher than that of quartz and illite.The structure of natural zeolite is destroyed,the specific surface area of natural zeolite decreases and the pore volume of natural zeolite increases under high alkali concentration.The hydrophilicity and ion exchange property of natural zeolites gradually increase,accompanied by the decrease of SiO_(2)/Al_(2)O_(3)ratio.
作者
王程
郭慧东
于佳乐
冯锴
于开宁
李艳
WANG Cheng;GUO Hui-dong;YU Jia-le;FENG Kai;YU Kai-ning;LI Yan(School of Material Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science and Technology,Xi'an 710021,China;Hebei Center for Ecological and Environmental Geology Research,Hebei Geo University,Shijiazhuang 050031,China;College of Gemstone and Material Technology,Hebei Geo University,Shijiazhuang 050031,China)
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2021年第3期565-570,共6页
Acta Petrologica et Mineralogica
基金
国家自然科学基金项目(51604170)
中国博士后基金项目(2016M602936XB)
陕西省自然科学基金项目(2018JM5025)
温州市科技计划项目(S20180008)
陕西省无机材料绿色制备与功能化重点实验室开放基金(202007)。
关键词
天然沸石
碱处理
硅铝比
亲水性
离子交换性能
natural zeolite
alkali treatment
SiO_(2)/Al_(2)O_(3)ratio
hydrophilicity
ion exchange property
