| Metal-organic framework (Metal-Organic Frameworks, MOFs) are a new class of porous material, which are formed by metal and organic ligand self-assembly. The diverse of composition and structure, large specific surface area, pore size regulated and easy modification make the materials have potential applications in many fields. The purpose of this article is to modify MOFs material, so that it have new features to enrich application of MOFs.This article includes the following four sections:Chapter one ReviewWe have summarized the research history of MOF, synthetic methods, structural features and application fields.Chapter two The synthesis and characterization of Fe3O4@SiO2@Fe-pamoate materialsUnique ternary single core-double shell structured magnetic microspheres of Fe3O4@SiO2@Fe-pamoate were successfully fabricated via a step-by-step assembly strategy. The procedures involved initial pre-treatment of the silica-coated magnetic cores with carboxyl groups to functionalize the magnetic microspheres, and subsequent alternating treatments with Fe+and pamoic acid solutions for growth of Fe-pamoate complexes on the microsphere surface to form Fe3O4@SiO2@Fe-pamoate magnetic microspheres. Characterization using various techniques demonstrated that the microspheres were porous, thermally stable, and possessed a single core-double shell sandwich structure. The as-synthesized materials possessed bifunctional character derived from the magnetic properties of the Fe3O4 nanoparticles and the high porosity of Fe-pamoate,Chapter three Fe3O4@SiO2@Fe-pamoate for extraction of sulfonamides from environmental water samplesMagnetic Fe304@Si02@Fe-pamoate magnetic microspheres have the large specific surface area, and are able to be quickly separated from the solution under the external magnetic field, which make them be used as an excellent adsorbent. So we used the Fe3O4@SiO2@Fe-pamoate microspheres as adsorbent for extraction of five sulfonamides from environmental water samples prior to high performance liquid chromatography analysis. The amount of adsorbent, the extraction time, the solution pH and the eluent conditions were optimized During the experiment under optimal conditions. The actual samples were spiked recovery. The results shown that the magnetic microspheres exhibited excellent capacity for enrichment of sulfonamides. Five sulfonamides had a wide linear range (0.5～50 ng mL-1), low detection line (0.08～0.12 ng mL-1),high precision (relative standard deviation 1.4～12.3%), and good linearity (R2>0.9947). Average recoveries at three spiked levels (3,10,30 ng mL-1) were in the range of 86.3 to 99.7% with relative standard deviations below 12.3%. This experiment not only broadens the scope of application of MOFs, and provides a new method to detecte sulfonamides from water samples.Chapter four Boron-Doped metal-organic framework for monosaccharide sensingIn this study, we first had used benzene boronic acid to modify NH2-MIL-53 (Al), which has fluorescent. Characterization using various techniques demonstrated that the boronic acids have been successfully modified to the MOF and the structures of MOF has not been damaged.boric acid and diol-containing compound can form reversible complexes, so we applied PBA-MIL-53 (Al) to detecte monosaccharides. The procedure for detectinhg monosaccharides was optimized by evaluating several parameters, i.e., the incubation time, the solution of pH, the effects of different concentrations of monosaccharide. Under optimum conditions, the linear range, the linear correlation coefficient, the minimum detection limit were measured and calculated. This is a fast, simple and sensitive method for detecting sugar.it provides a new way for the identification and detection of sugar carbohydrates.
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