H_(3)PMo_(12)O_(40)/MOF-808复合材料制备及其吸附性能研究  

Research on preparation and absorption properties of H_(3)PMo_(12)O_(40)/MOF-808 composites

作　　者：杨赟 张依灵 胡豪 杨水金 YANG Yun;ZHANG Yi-ling;HU Hao;YANG Shui-jin(Guizhou Province Key Laboratory of Ecological Protection and Restoration of Typical Plateau Welt,Guizhou University of Engineering Science,Bijie551700,China;College of Chemistry and Environmental Engineering,Hanjiang Normal University,Shiyan 442000,China;College of Chemistry and Chemical Engineering,Hubei Normal University,Huangshi435002,China)

机构地区：[1]贵州工程应用技术学院贵州省典型高原湿地保护与修复重点实验室,贵州毕节551700 [2]汉江师范学院化学与环境工程学院,湖北十堰442000 [3]湖北师范大学化学化工学院,中国黄石435002

出　　处：《化学研究与应用》2023年第4期862-869,共8页Chemical Research and Application

基　　金：2021年贵州省典型高原湿地保护与修复重点实验室开放基金一般项目(202104)资助;湖北省教育厅重点项目(D20213102)资助。

摘　　要：以Keggin型磷钼酸、1,3,5-均苯三甲酸和八水氯氧化锆为原料,通过一步原位溶剂热制备了复合型吸附剂,通过XRD、SEM、FT-IR和TGA等表征手段说明,将亲水性杂多酸固定在MOF-808金属有机骨架基体上,对水溶液中亚甲基蓝溶液的吸附能力得以提升。动力学实验表明,H_(3)PMo_(12)O_(40)/MOF-808对亚甲基蓝的吸附符合准二级动力学模型,吸附等温线遵循Langmuir等温线模型,表明MB均匀吸附在H_(3)PMo_(12)O_(40)/MOF-808表面。根据Langmuir模型,在pH值为8,T=303K,吸附剂吸附性能最好。热力学研究表明,吸附过程是一个自发的放热反应。此外,H_(3)PMo_(12)O_(40)/MOF-808在五个连续循环实验中从其水溶液中吸附MB分子,表现出较好地可重复使用性。Using Keggin-type H_(3)PMo_(12)O_(40),1,3,5-trimesic acid,and ZrOC_(l2)·8H_(2)O as raw materials,composite materials were prepared by a simple one-pot solvothermalreaction.Characterizations such as XRD,SEM,FT-IR and TGA proved that the polyoxometalates and metal-organic frameworks were successfully composited.The results of adsorption experiments showed that the adsorption capacity of MOF-808 for methylene blue solution in aqueous solution was improved by immobilizing the hydrophilic POM in the metal-organic framework of MOF-808.Kinetic experiments showed that the adsorption of MB on H_(3)PMo_(12)O_(40)/MOF-808 followed a kinetic model close to the second order.The adsorption isotherm corresponds to the Langmuir isotherm model,indicating that MB is uniformly adsorbed on the surface of H_(3)PMo_(12)O_(40)/MOF-808.According to the Langmuir model,at pH 8,T=303K,the adsorption performance of the adsorbent is the best.Thermodynamic studies show that the adsorption process is a spontaneous exothermic reaction.Furthermore,H_(3)PMo_(12)O_(40)/MOF-808 adsorbed MB molecules from its aqueous solution in five consecutive cycles,showing appropriate reusability.

关 键 词：多金属氧酸盐 金属有机骨架 吸附 亚甲基蓝 

分 类 号：O614.5[理学—无机化学]