天然斜发沸石基方沸石及其改性对Pb^(2+)的吸附性能  

Adsorption performance of natural clinoptilolite based analcime and its modifications on Pb^(2+)

作　　者：张伊 么秋香 孙鸣[1] ZHANG Yi;YAO Qiuxiang;SUN Ming(School of Chemical Engineering,Northwest University,International Science&Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources,Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy,Shaanxi Research Center of Engineering Technology for Clean Coal Conversion,Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern,Xi’an 710069,Shaanxi,China;School of Electronic Information,Xijing University,Xi’an 710123,Shaanxi,China)

机构地区：[1]西北大学化工学院,国家碳氢资源清洁利用国际科技合作基地,陕北能源先进化工利用技术教育部工程研究中心,陕西省洁净煤转化工程技术中心,陕西西安710069 [2]西京学院电子信息学院,陕西西安710123

出　　处：《化工进展》2025年第3期1726-1738,共13页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(22078266,22178289,22278338);国家重点研发计划(2023YFB4103400);陕西省重点研发计划(2024GXYBXM-480);西京学院高层次人才专项(XJ21B10,XJ23T02)。

摘　　要：首次以天然斜发沸石为原料,在无需额外添加硅铝源的基础上通过水热法制备方沸石(ANA),并采用NaOH和NaCl对ANA进行改性制得OH-ANA和Na-ANA。采用XRD、SEM、FTIR、BET、zeta电位和ICP-OES对合成沸石进行了表征,并研究了合成沸石对Pb^(2+)的吸附性能。结果表明,改性后的Na-ANA和OH-ANA的比表面积均高于ANA,Na-ANA和OH-ANA对Pb^(2+)最大吸附容量分别为96.00mg/g、125.54mg/g,均大于ANA的71.95mg/g,表明天然斜发沸石基方沸石在经过改性后吸附性能有所提升。ANA、Na-ANA和OH-ANA对Pb^(2+)吸附是一个吸热的自发过程,符合伪二级动力学和Langmuir等温线模型,且吸附速率由外扩散和颗粒内扩散共同控制。材料表征结果显示,ANA、Na-ANA和OH-ANA对Pb^(2+)吸附机理是静电吸引、离子交换和化学络合三者的协同作用。再生循环实验表明,OH-ANA材料具有良好的可再生性能。综上所述,ANA、Na-ANA和OH-ANA在去除重金属离子方面具有一定的应用潜力。In this study,natural clinoptilolite was used for the first time as a raw material to synthesize analcime(ANA)by a hydrothermal method without the need for additional silicon-aluminium sources.The resulting ANA was further modified using NaOH and NaCl to obtain OH-ANA and Na-ANA.The synthesized zeolites were characterized by XRD,SEM,FTIR,BET,zeta potential and ICP-OES.The adsorption performance of the synthesized zeolites for Pb^(2+)was investigated.The results showed that the specific surface areas of modified Na-ANA and OH-ANA were higher than those of ANA.The maximum adsorption capacities of Na-ANA and OH-ANA for Pb^(2+)were 96.00mg/g and 125.54mg/g,respectively,both higher than that of ANA(71.95mg/g),indicating an improvement in the adsorption performance after modification.The adsorption of Pb^(2+)by ANA,Na-ANA and OH-ANA was an endothermic spontaneous process following pseudo-second-order kinetics and Langmuir isotherm models.The adsorption rate was controlled by both external and intraparticle diffusion.Material characterization results showed that the adsorption mechanisms involved the synergistic effects of electrostatic attraction,ion exchange and chemical complexation for ANA,Na-ANA and OH-ANA towards Pb^(2+).Regeneration cycle experiments showed that OH-ANA had good renewable properties.In conclusion,ANA,Na-ANA and OH-ANA had potential applications in the removal of heavy metal ions.

关 键 词：天然斜发沸石 水热法 方沸石 二价铅 吸附性能 

分 类 号：X523[环境科学与工程—环境工程]