红辉沸石两步水热制备高品质X型分子筛及其高效吸附Cd^(2+)、Ni^(2+)性能研究  

Two-step Hydrothermal Synthesis of Stellerite Zeolite to High Quality Zeolite X and Its Efficient Adsorption Performance Study for Cd ^(2+)and Ni ^(2+)

作　　者：裴胤昌 莫胜鹏 解庆林[1,2] 陈南春[3,4] PEI Yinchang;MO Shengpeng;XIE Qinglin;CHEN Nanchun(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541006,Guangxi,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541006,Guangxi,China;College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi,Guilin University of Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541006 [2]桂林理工大学广西岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541006 [3]桂林理工大学材料科学与工程学院,广西桂林541004 [4]桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西桂林541004

出　　处：《材料导报》2023年第24期86-94,共9页Materials Reports

基　　金：国家自然科学基金(41662005,51564008)。

摘　　要：本研究以红辉沸石为原料,经两步水热法制备高品质的X型分子筛,探究了n(H_(2)O/SiO_(2))、n(Na_(2)O/SiO_(2))、n(Al_(2)O_(3)/SiO_(2))、陈化时间、晶化温度、晶化时间等因素对红辉沸石转化为X型分子筛的影响,以及考察了X型分子筛对Cd^(2+)、Ni^(2+)的吸附性能。研究表明,X型分子筛的最优转化条件为:n(H_(2)O/SiO_(2))=55、n(Na_(2)O/SiO_(2))=1.1、n(Al_(2)O_(3)/SiO_(2))=0.33、陈化时间48 h、晶化温度82℃、晶化时间4 h。红辉沸石溶解后解聚为低聚态Si物种且在体系中保留参与分子筛的生长,使得所合成的X型分子筛相对结晶度达100%、n(Si/Al)值为1.14,并缩短了晶化时间和降低了晶化温度,其中所合成的X型分子筛对Cd^(2+)和Ni^(2+)的吸附容量分别达到173.553 mg/g和75.897 mg/g。因此,本研究将为天然矿物快速转化为高品质的X型分子筛设计与制备提供理论基础和技术支持。In this study,high quality zeolite X was conversed from stellerite zeolite by a two-step hydrothermal method.The influence of n(H_(2)O/SiO_(2)),n(Na_(2)O/SiO_(2)),n(Al_(2)O_(3)/SiO_(2)),aging time,crystallization temperature and crystallization time of the stellerite zeolite conversion into zeolite X were investigated,and the adsorption performance for Cd ^(2+)and Ni ^(2+)of zeolite X was investigated.The results showed that the optimal conversion conditions of zeolite X were as follows:n(H_(2)O/SiO_(2))=55,n(Na_(2)O/SiO_(2))=1.1,n(Al_(2)O_(3)/SiO_(2))=0.33,aging time 48 h,crystallization temperature 82℃and crystallization time 4 h.After dissolution,the stellerite zeolite depolymerized into the oligomeric Si species and remained in the system to participate in the growth of zeolite X,prompting the relative crystallinity and n(Si/Al)value of the synthesized zeolite X were 100%and 1.14,respectively.It was beneficial to shorten the crystallization time and reduce the crystallization temperature.And the adsorption capacity of Cd ^(2+)and Ni ^(2+)for zeolite X were 173.553 mg/g and 75.897 mg/g,respectively.Therefore,this study would provide theoretical basis and technical support for the rapid conversion of natural minerals into high quality zeolite X design and preparation.

关 键 词：红辉沸石 X型分子筛 两步水热法 吸附性能 镉离子 镍离子 

分 类 号：TB382[一般工业技术—材料科学与工程]