Application of manganese dioxide nano composite material in nitrite detection, electrochemical sensor and preparation and detection methods

The invention provides application of a manganese dioxide nano composite material in nitrite detection, an electrochemical sensor and preparation and detection methods, and belongs to the technical field of functional nano composite materials and sensing. The electrochemical sensor constructed by a noble metal-calixarene modified manganese dioxide nano composite material has the advantages of simplicity in operation, rapidness in detection, low cost and the like, can be used for rapid and accurate quantitative detection of nitrite in an actual sample, has the advantages of being high in sensitivity, wide in detection range, high in detection speed, low in detection limit, special in selectivity, convenient to operate and the like, and a cheap, rapid and sensitive method is provided for nitrite detection. The detection limit of the electrochemical sensor for detecting the nitrite is 0.33 muM, and the content of the nitrite in an actual sample can be successfully detected and the detection limit is lower than t