不同改性方法对天然斜发沸石组成结构及气体吸附性的影响研究  

Influence of Different Modification Method on the Composition,Structure and Gas Adsorption Property of Natural Clinoptilolite

作　　者：王程[1,2] 梁鑫超 王李鹏 都扶岭 于倩茹 WANG Cheng;LIANG Xinchao;WANG Lipeng;DU Fuling;YU Qianru(School of Material Science and Engineering,Shaanxi University of Science and Technology,Xi’an 710021,Shaanxi,China;Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Xi’an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021 [2]陕西省无机材料绿色制备与功能化重点实验室,陕西西安710021

出　　处：《矿产保护与利用》2023年第4期89-95,共7页Conservation and Utilization of Mineral Resources

基　　金：陕西省重点研发计划项目(2022GY-163);陕西省教育厅服务地方专项项目(22JC020);咸阳市重点研发计划项目(S2021ZDYF-GY-0189)

摘　　要：天然斜发沸石是储量最大且最具工业利用价值的天然沸石之一,然而受自身组成结构的限制,其吸附性能和环境应用效果欠佳,大规模应用进程迟缓。尽管通过对天然斜发沸石进行改性处理可在一定程度上解决上述问题,但目前关于不同改性方法对其组成结构及吸附性能的影响差异尚不完全明确,缺乏系统的对比研究。以河北承德围场地区天然斜发沸石为研究对象,考察并对比酸、碱、水热和热处理对其组成结构以及水蒸气、甲醛和甲苯气体吸附性的影响。结果表明:几种改性方法对天然斜发沸石的组成结构和气体吸附性的影响程度存在较大差异。酸、碱处理使得斜发沸石的结晶度有所降低,400℃热处理可破坏斜发沸石的晶体结构,水热处理使得天然斜发沸石转变为方沸石和P型沸石。天然沸石样品的比表面积和硅铝比分别为13 m^(2)/g和5.2,对水蒸气、甲醛和甲苯气体的吸附量分别为7.5 mg/g、8.5 mg/g和7.5 mg/g;而酸、碱、水热和热处理后沸石样品的比表面积分别为147 m^(2)/g、30 m^(2)/g、27 m^(2)/g和11 m^(2)/g,硅铝比分别为14.9、4.8、3.2和5.2,对水蒸气的吸附量分别为16.5 mg/g、8.0 mg/g、15.0 mg/g和8.5 mg/g,对甲醛的吸附量分别为27.0 mg/g、14.5 mg/g、9.0 mg/g和7.5 mg/g,对甲苯的吸附量分别为26.0 mg/g、8.5 mg/g、6.5 mg/g和5.0 mg/g。不同改性沸石气体吸附性能的差异与其比表面积和孔体积、硅铝比等特征密切相关。酸处理沸石具有相对更高的比表面积和孔体积,表现出优异的气体吸附性能。该研究对于天然斜发沸石的高效利用具有一定促进作用。Natural clinoptilolite is one of the natural zeolites with the largest reserves and the most valuable industrial use.However,due to the limitation of its composition and structure,its adsorption property and environmental application effect are not good enough,which limits its large−scale application.Although the above problems can be somehow solved by modifying natural clinoptilolite,the differences in the effects of different modification methods on its composition and adsorption properties are not completely clear at present,and systematic comparative studies are lacking.In this paper,the natural clinoptilolite in Weichang area of Chengde,Hebei Province was studied,and the effects of acid,alkali,hydrothermal and heat treatment on its composition,water vapor,formaldehyde and toluene gas adsorbability were investigated and compared.The results showed that the effects of different modification methods on the composition and gas adsorbability of natural clinoptilolite were quite different.Acid and alkali treatment reduced the crystallinity of clinoptilolite.400℃heat treatment destroyed the crystal structure of clinoptilolite.Hydrothermal treatment could transform the natural clinoptilolite to analcime and Na−P zeolite.The specific surface area and Si/Al ratio of natural zeolite samples were 13 m^(2)/g and 4.20,respectively,and the adsorption capacities of water vapor,formaldehyde and toluene were 7.5 mg/g,8.5 mg/g and 7.5 mg/g,respectively.The specific surface areas of acid,alkali,hydrothermal and heat−treated zeolite samples were 147 m^(2)/g,30 m^(2)/g,27 m^(2)/g and 11 m^(2)/g,respectively,and the Si/Al ratios were 24.73,3.85,2.39 and 4.20,respectively.The adsorption capacities of water vapor were 16.5 mg/g,8.0 mg/g,15.0 mg/g and 8.5 mg/g,respectively,and the adsorption capacities of formaldehyde were 27.0 mg/g,14.5 mg/g,9.0 mg/g and 7.5 mg/g,respectively.The adsorption capacities of toluene were 26.0 mg/g,8.5 mg/g,6.5 mg/g and 5.0 mg/g,respectively.The difference of gas adsorption properties of differen

关 键 词：天然斜发沸石 比表面积 硅铝比 改性处理 气体吸附 

分 类 号：TD985[矿业工程—选矿] TD91