Synthesis of Zinc Organic Frame Materials and Study on the Extraction Performance of Pb2+in Water
A zinc organic frame material(Zn-MOF)was prepared by solvothermal reaction of 5,11,17,23-tetrabutyl-25,26,27,28-tetrabutyl-calypylidene[4]aromatics,2,2′-bipyridine and zinc nitrate hexahydrate.The effect of this material on the extraction performance of Pb2+was studied in terms of pH value,time and initial concentration of Pb2+.The results show that the extraction efficiency of Zn-MOF for Pb2+can reach 99%in the pH value range of 4～7.Pb2+extraction can be balanced within 20 minutes.As the initial concentration of Pb2+increases,the extraction capacity of Zn-MOF for Pb2+increases,and the maximum extraction amount is 243.57 mg·g-1.Meanwhile,the extraction of Pb2+by Zn-MOF is consistent with Langmuir isothermal model and quasi-second-order kinetic model.
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