Preparation Of BiPO₄/BiOX(X=Cl,Br,I) Photoelectric Material And Its Detection Performance For Phenolic Pollutants In Water

The environmental problem brought by economic development has always been a difficult problem.As an important chemical raw material,phenolic substances are discharged into the environment in the production and life process,which poses a potential threat to the ecological environment and human health.Therefore,it is particularly important to develop analytical methods for trace phenolic substances in the water.Photoelectrochemical?PEC?detection method has the advantages of simple operation,low detection limit and wide detection range.It has been widely studied in the field of environmental detection,biological and medical analysis.In this paper,the PEC analysis method is applied to the detection of phenolic substances in water.The key of PEC analysis method is the preparation of high-performance PEC materials.BiPO₄/BiOX?X=Cl,Br,I?composites were prepared by a hydrothermal method,and PEC sensors were constructed to detect phenolic substances in water.The main research contents are as follows:?1?BiPO₄/BiOCl composites were prepared by the one-step hydrothermal method;The introduction of BiPO₄ can enhance the optical absorption and electronic transmission rate of the pure BiOCl material,endowing a better photoelectric response of BiPO₄/BiOCl composites.A PEC sensor for the detection of4-chlorophenol?4-CP?in water was constructed using BiPO₄/BiOCl composites as PEC materials.The linear range of the PEC sensor was 20³.38*10⁴ng/mL,and the detection limit was 6.78 ng/mL.The concentration of actual water samples was determined by using the constructed PEC sensor.The recoveries were between98.13%to 100.29%.?2?BiPO₄/BiOBr composites were prepared by the one-step hydrothermal method;BiPO₄/BiOBr heterojunction owns the enhanced optical absorption and reduced recombination of photogenerated electron-hole pairs,increasing the electron transmission rate,which leads to a satisfactory photoelectric response of BiPO₄/BiOBr composites.A PEC sensor for the detection of 4-chlorophenol?4-CP?in water was constructed using BiPO₄/BiOBr composites.The linear range of the PEC sensor was 8²400 ng/mL,and the detection limit was 3.75 ng/mL.Compared with BiPO₄/BiOCl composite,the photoelectrochemical sensor based on BiPO₄/BiOBr composite can obtain a lower detection limit of 4-CP.The 4-CP concentration of actual water samples was determined by using the constructed PEC sensor.The recoveries were between 99.25%to 102.87%.?3?BiPO₄/BiOI composites were prepared by the one-step hydrothermal method;The addition of BiPO₄ can enhance the optical absorption of BiOI materials and reduce the resistance of electronic transmission,resulting into the higher photoelectric conversion efficiency of BiPO₄/BiOI composites.A PEC sensor for the determination of catechol in water was constructed by using the prepared BiPO₄/BiOI composites.The linear range of the PEC sensor was 6¹.2*10⁴ng/mL,and the detection limit was 2 ng/mL.The concentration of catechol in real water samples was determined by using the constructed PEC sensor.The recoveries were between 99.2%to 101%,indicating a satisfactory accuracy.