Study On Constructing Aqueous Pollutants Sensor Based On MOF-Derived Composite Material

Organic pollutants such as phenols and organophosphorus pesticides are highly toxic,poor degradability,and bioaccumulative,therefore,it is necessary to rapid detection of organic pollutants.Due to the good stability,uniform structure and large specific surface area,the MOF-derived porous composites have attracted considerable attention in recent years,they have a good application prospect in the fields of electrochemical sensing.In this paper,several kinds of derivatives were successfully prepared by pyrolysising MOFs with controllable structure and their structures were investigated by means of various characterization.At the same time,the prepared materials were used as the sensors to electrochemical detection organic pollutants:catechol(CC),hydroquinone(HQ)and methyl parathion(MP)in environment.Specific contents as follow:Firstly,we choosed MIL-125(Ti)?MIL-101(Cr)?MIL-101(Fe)as a precursor and used the calcination method for the synthesis of TiO2/C?Cr2O3/C?Fe2O3/C composite materials,respectively.We discussed the electrochemical performance of different products when they are applied to dihydroxybenzene sensor.The experiment revealed that the differences in metal center could lead to different performances of the derived porous carbon material,which provided another way for the construction of high-performance sensors.Secondly,the N-doped CoO/Co/C material(C-ZIF-67-800?C-ZIF-67/PAN-800) synthesized by pyrolysising ZIF-67 and ZIF-67/PAN composite nanofiber prepared by electrospinning ZIF-67 with polyacrylonitrile(PAN).The electrochemical sensor based on N-doped CoO/Co/C material glassy modified carbon electrode which realized the detection of dihydroxybenzene.The experiment revealed that the introduction of N source by electrospinning to improves the electrochemical performance of the pyrolyzed material.Finally,TiO2/C?ZrO2/C composite materials were synthesized by thermal treatment of MIL-125(Ti)?UIO-66(Zr).When TiO2/C?ZrO2/C applied to construct the electrochemical sensors for determination of MP,MP had a good response onTiO2/C/GCE and ZrO2/C/GCE.The results revealed that TiO2 prepared with MIL-125 may have a greater affinity for phosphate groups than ZrO2 prepared with UIO-66.