| Phenolic organic pollutants have been listed as one of the key pollutants to be monitored and controlled by environmental protection authorities in many countries because of their high toxicity and difficulty in degradation.Previously,there have been gas chromatography,high performance liquid chromatography and fluorescence spectrophotometry methods for the detection of phenolic organic pollutants.However,the previous methods are difficult to achieve low-cost,low-concentration and rapid detection of phenolic pollutants.Therefore,there is an urgent need to develop a simple,rapid,reliable and low-cost method for the detection of phenolic pollutants in the environment.Colorimetric and electrochemical sensing detection methods are ideal for rapid detection of low concentrations of phenolic organic contaminants with high sensitivity and selective detection with the addition of catalysts.In this paper,we construct a sensing platform based on the enzyme-like catalytic properties of MOFs-derived nanoenzymes,and use colorimetric and electrochemical sensing methods to achieve rapid and efficient detection of phenolic pollutants,respectively,as follows:1.Metal-organic framework-derived bimetallic oxide nanocomposite fibermembrane for colorimetric detection of phenolMOFs-derived nanoenzymes are of great interest for their rich active sites,huge pore structures and compositional diversity.In the present work,bimetallic oxide composite nanoenzymes with peroxidase-like activity were prepared using the variable-valence metal Co/Mn bimetallic MOF-74 as a precursor.Compared with the monometallic MOF-derived nanoenzymes,the catalytic activity was enhanced by the synergistic effect of the coupling of Co and Mn species due to the binary valence nature of Co and Mn.The nanoenzyme was combined with cellulose by suction filtration to form a nanoenzyme fibrous membrane(NFM).The prepared NFM has a stable pore structure and excellent peroxidase-like activity and can be used to prepare rapid in situ assay test strips for phenol.The assay has a wide linear range from 0.5 to500 μM with a detection limit of 0.2 μM,which is better than the previously reported phenol detection methods.It was also successfully applied to the in situ and visual detection of phenol in seawater.It is shown that the rational design of bimetallic MOF-derived NFM with special surface physicochemical properties,porous nanostructures and efficient catalytic activity can open a new path for the development of high-performance in situ detection platforms.2.In situ grown bimetallic MOF/reduced graphene based nanocomposites for bisphenol A electrochemical detectionIn this work,graphene nanocomposites MOF-74/rGO with excellent electrochemical activity were synthesized by in situ growth of bimetallic MOF-74 on conducting substrate material r GO by solvent method,and then the nanocomposites were further treated using high-temperature carbonization method,and the electrochemical behavior of the modified electrodes prepared from the composites was tested.Finally,a C-MOF-74/r GO/GCE electrochemical sensing platform for phenolic pollutant detection was developed with the synergistic effect of the excellent stability,electrocatalytic activity and electrical conductivity of r GO and MOF high-temperature-derived materials.The electrochemical sensing platform successfully achieved high sensitivity for the detection of BPA with a linear range from 10 to 500 μM and detection limits as low as 0.19 μM,and excellent stability and selectivity.At the same time,the platform can also be used for the detection of other phenolic organic pollutants. |
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