基于H_3PMo_(12)O_(40)修饰一例MOF复合材料及对染料的吸附

An Metal Organic Frameworks for Adsorption of Dyes Based on H_3PMo_(12)O_(40) Modified

采用溶剂热法,以H3PMo12O40和金属有机骨架〔Cu3(BTC)2,BTC=均苯三甲酸根〕为原料构筑一例金属有机骨架复合材料〔H3PMo12O40@Cu3(BTC)2〕·x G(G=客体分子),并采用IR、XRD、SEM、TG、BET进行表征。研究其对水溶液中亚甲基蓝(MB)的吸附性能,并探讨了初始p H、温度、不同初始浓度的MB对吸附容量的影响。结果表明降低温度和降低溶液的初始p H值有利于亚甲基蓝的吸附。等温吸附模型符合Langmuir等温吸附模型,动力学符合拟二级动力学。热力学参数ΔG<0,ΔΗ<0和ΔS>0,表明H3PMo12O40@Cu3(BTC)2对亚甲基蓝的吸附是自发和放热的,除此之外对甲基紫、罗丹明B、孔雀石绿、碱性品红等阳离子染料也有良好的吸附性能。

By employing the H3PMo12O40 to assemble metal-organic framework Cu3（BTC）2,BTC = 1,3,5-benzenetricarboxylate）,a metal organic frameworks composites,namely [H3PMo12O40@ Cu3（BTC）2]· x G（G = guest） was synthesized.By X-ray powder diffraction pattern（XRD）,Fourier transform infrared spectrum（FTIR）,scanning electron micrographs（SEM）,thermogravimetric（TG）,brunaue Emmett teller（BET）,the composition,structure,morphology,stability and toleration of H3PMo12O40@ Cu3（BTC）2were characterized.The adsorption of methylene blue（MB） onto H3PMo12O40@ Cu3（BTC）2in aqueous solution was studied.The effects of the experimental parameters,including sample solution initial p H,temperature and initial concentration were investigated.The results showed that the lower temperature and lower initial p H value were beneficial to the dye adsorption.The experiment data could be well described by the Langmuir equations and pseudo-second-order kinetic model.Thermodynamic parameters ΔG〈 0,ΔΗ 〈0 and ΔS〉 0 indicated that the MB adsorption onto H3PMo12O40@ Cu3（BTC）2was spontaneous and exothermic,The adsorption towards methyl violet,rhodamine B,malachite green and basic fuchsine cationic dyes also showed good adsorption properties.