MOF复合材料在固相萃取中的应用进展

Application of metal organic framework composites in solid phase extraction

样品前处理是分析过程中不可或缺的一步.无论样品是气态、液态还是固态,只有经过前处理才能进行后续分析,其主要目的是使样品中目标组分浓度升高,提高仪器的灵敏度,去除样品中的其他杂质以得到较为纯净的目标组分.而样品前处理的关键是吸附剂类型的选择,它决定了萃取效率.金属有机骨架化合物(MOF)是一种新型材料,因其组成和结构非常丰富,且比表面积和孔隙率高、孔道性能可调、热稳定性较好等诸多优势,被广泛应用于样品前处理.而MOF与其他材料结合形成的复合物不仅克服了MOF本身的缺点,而且还对MOF的特性进行重大改进.本文主要综述了近年来MOF与磁性材料、碳及聚合物等材料复合后作为固相萃取吸附剂在环境、食品和生物等样品分析方面的应用.

Sample pretreatment is an indispensable step in the analysis process.Whether the sample is gaseous,liquid,or solid,pretreatment must be carried out before the sample analysis.The main purpose of pretreatment is to increase the concentration of the target component,improve the sensitivity of the instrument,and remove other impurities to obtain a purer target component.The key of sample pretreatment is the selection of adsorbent,which determines the extraction efficiency.Metalorganic franework(MOF),as a new kind of cage material,has attracted much attention.Its uniform pore structure shows the molecular sieve effect and shape selectivity in the adsorption process.In addition,MOF has many advantages,such as rich composition and structure,high specific surface area and porosity,adjustable pore performance,good thermal stability,etc.MOFs are widely used in gas storage and capture,catalysis,sample pretreatment and other fields.The composite formed by the combination of MOF and other materials not only overcomes the shortcomings of MOF itself,but also greatly improves the properties of MOF.This paper mainly reviewed the applications of MOF composites(including MOF@magnetic material,MOF@carbon composite,MOF@polymer composite,etc)as solid phase extraction adsorbents in the environmental analysis,food analysis and biological sample analysis.