High sensitivity and selectivity detection of chlorpyrifos by direct Z-type photocatalysis

Recently, Huang Xingjiu research group of intelligent Institute of Hefei Research Institute of Chinese Academy of Sciences has designed and prepared a kind of direct Z-type photocatalytic heterojunction ZnS / CO 9s 8 with hollow structure for the first time, and constructed a ZnS / CO 9s 8 photoelectric sensor, which can realize the highly sensitive and selective detection of Chlorpyrifos Relevant research results have been received and published by environmental science: nano (DOI: 10.1039 / c9en01265f) In order to improve the yield of crops, organophosphorus pesticides are widely used in agricultural production Compared with other organophosphorus pesticides, chlorpyrifos is the most widely used pesticide in the world Therefore, it is very important to develop a new method with high sensitivity, high selectivity, simple and rapid detection of chlorpyrifos residues In recent years, photoelectrochemical detection method has been widely concerned because of its high sensitivity, fast response, simple equipment and easy miniaturization Photoelectric detection has also made some progress in the detection of organic pollutants, but the design of highly sensitive and selective photoelectric chemical sensitive interface without biomarkers is still facing severe challenges Because of its excellent catalytic performance, direct z-heterojunction has been widely used in water decomposition, CO2 reduction, organic matter degradation and other research fields, which represents the latest development trend of new energy utilization and environmental purification According to the energy band structure of semiconductor materials, the direct Z-type heterojunction designed by Huang Xingjiu group makes the photogenerated carriers of photoelectric materials separate faster and reduce their recombination, thus improving the photocatalytic performance; in addition, the structure of hollow vertical block greatly enhances the light absorption of photoelectric materials, which improves the sensitivity of sensors to chlorpyrifos In addition, the team also found that the high selectivity of the photoelectric sensor is due to the specific binding of the co site on the surface of ZnS / Co9S8 heterojunction with the adjacent s and N atoms in chlorpyrifos This study provides a new idea for the design of a more simple, highly sensitive and selective photoelectric sensitive interface, that is, to build a photoelectric sensitive interface based on the direct Z-type heterostructure, which has great potential in photoelectric detection of inert organic pollutants The research work has been supported by key projects of NSFC, Boxin plan, major science and technology projects of Anhui Province, and key supporting projects of the 13th five year plan of Hefei Institute of material science, Chinese Academy of Sciences.