Research Progress of Metal-Organic Framework-Based Materials as Sorbents in Sample Pretreatment
As one important part of analytical method for detecting trace compounds in complex samples,sample pretreatment can not only improve the selectivity and sensitivity with enrichment of target analytes,but also affect accuracy and reliability by eliminating most other interferences from samples.In additional,sample pretreatment also determines total analysis time.Metal-organic frameworks(MOFs)are a type of topological porous polymers which are constructed by self-assembly of organic linkers(also named ligands)and metal ions/metal oxygen clusters through coordination bonds.Due to their several fascinating features,such as diverse structural topologies,good designability,high porosity,large specific surface area,modifiable pore size,diversified components and rich functional groups,MOFs as sorbents in sample pretreatment have received considerable attention,and are considered to have broad application prospects.In this work,the sample pretreatment techniques including solid phase extraction,dispersive solid phase extraction,magnetic solid phase extraction,and solid phase microextraction based-on MOFs as sorbent as well as their applications in environments,foods and biological samples in the past ten years are reviewed.Furthermore,the methods for preparation and functional regulation of MOFs,as well as their analytical parameters,adsorption effect and extraction mechanism are also discussed.In the last,the application prospect of metal-organic framework materials in the field of sample preparation is summarized.