Electrochemical sensor for determining o-phenylenediamine with high flexibility as well as determining method of sensor
An o-phenylenediamine, high-sensitivity technology, applied in the field of nanomaterial technology and electrochemical analysis and detection, can solve the problems of difficult to meet on-site detection, rapid analysis, dependence on complex experimental equipment, cumbersome detection operation steps, etc., to achieve construction and detection Process economy, high sensitivity, good anti-interference effect
Inactive Publication Date: 2014-01-29
SHANGHAI UNIV
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Problems solved by technology
[0004] With the advancement of modern technology, the detection technology for o-phenylenediamine is also developing continuously. The early detection methods for o-phenylenediamine are mainly spectroscopic and chromatographic techniques , but with the improvement of detection requirements, the previous methods are no longer competent
In recent years, the detection technology for o-phenylenediamine has made great improvements in accuracy and sensitivity. However, due to the cumbersome detection procedures or the dependence on complex experimental equipment, it is difficult to meet the requirements of on-site detection and rapid analysis.
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Embodiment 1
[0016] The preparation method and steps of the modified glassy carbon electrode in the present embodiment are as follows:
[0017] (1) Pretreatment of the glassy carbon electrode: first, the glassy carbon electrode was treated with 0.5M H 2 SO 4 Soak for half an hour, then rinse clean; grind the rinsed glassy carbon electrode with 5000-mesh sandpaper for 5 minutes, and then use 1mm, 0.3mm, 0.05mm alumina powder to grind on the suede for 5 minutes, so that the polished glass The carbon electrode has a flat mirror surface, and then successively wash with absolute ethanol, 0.5M H 2 SO 4 Ultrasonic cleaning with ultrapure water for 5 minutes each, rinse and set aside;
[0018] (2) LaNiTiO 3 -Fe 3 o 4 Preparation of modified glassy carbon electrode: first prepare a certain concentration of LaNiTiO with ultrapure water 3 -Fe 3 o 4 Suspension, the most suitable concentration is 0.10mg / mL, ultrasonic vibration at room temperature for 4 hours; then the ground glassy carbon ele...
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The invention relates to a preparation of a modified glassy carbon electrode by utilizing a novel perovskite composite nano material LaNiTiO3-Fe3O4 as well as an application of the modified glassy carbon electrode serving as an o-phenylenediamine electrochemical sensor to rapid and flexible determination of an o-phenylenediamine solution, and belongs to the technical field of nano science and technology and electrochemical analysis detection. The invention is mainly characterized in that by utilizing electrochemical catalysis and oxidation effects on o-phenylenediamine by the o-phenylenediamine sensor prepared from the LaNiTiO3-Fe3O4 turbid liquid modified glassy carbon electrode, the o-phenylenediamine is subjected to high-flexibility quantitative analysis testing through a square wave volt-ampere pulse method. According to the key points, a dispersed LaNiTiO3-Fe3O4 uniform turbid liquid is modified to the surface of the treated glassy carbon electrode by a dispensing method, and is distributed on the surface of the glassy carbon electrode in a layered mode under an self-assembly effect of nano particles so as to form a uniform membrane structure, and the catalysis and a favorable electronic transmitting effect on the o-phenylenediamine are realized. The o-phenylenediamine sensor manufactured according to the invention can be used for the rapid and accurate determination of the o-phenylenediamine, expresses reliably and stably in an analysis experiment of commercially available samples, and has the favorable characteristics of low manufacturing cost, long service life, favorable reproducibility and the like.
Description
technical field [0001] The invention relates to a kind of composite nano material LaNiTiO utilizing perovskite 3 -Fe 3 o 4 The invention discloses a method for measuring o-phenylenediamine (o-phenylenediamine) by a modified glassy carbon electrode (GCE), belonging to the technical fields of nanometer material technology and electrochemical analysis and detection. Background technique [0002] Perovskite-type nanomaterials have a variety of functional properties. Their catalytic oxidation properties, electron transfer properties, and film-forming properties have attracted widespread attention in the research of perovskite-type nanomaterials in the field of electrochemistry. Basic research on these properties, It also provides support for the construction of electrochemical sensors based on perovskite nanomaterials; on the other hand, due to the fast and sensitive electrochemical detection methods, the synthesized perovskite nanomaterials are economical and durable, making ...
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IPC IPC(8): G01N27/30G01N27/48
Inventor 徐彦红周英哲辛美玲黄岩郑文玲马文丽
Owner SHANGHAI UNIV