Microcystic toxin molecular imprinting functionalization TiO2@CNTs photoelectric sensor electrode and photoelectric analysis method with same

A technology of microcystin and molecular imprinting, applied in nanotechnology for materials and surface science, material electrochemical variables, nanotechnology, etc., can solve problems such as poor stability and easy degradation of polymer molecular imprinting, and achieve Rapid response, good application prospects, excellent selective recognition effect

Inactive Publication Date: 2016-08-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polymer molecular imprinting technology has achieved initial success in photoelectric analysis of MC-LR (Environmental Science and Technology, 2012, 46(21):11955-11961), but polymer molecular imprinting has the disadvantages of easy degradation and poor stability. shortcoming

Method used

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  • Microcystic toxin molecular imprinting functionalization TiO2@CNTs photoelectric sensor electrode and photoelectric analysis method with same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A microcystin molecularly imprinted functionalized TiO 2 @CNTs photoelectric sensing electrode consists of a base electrode and MI-TiO covered on the surface of the base electrode 2 @CNTs nanomaterial composition, the MI-TiO 2 @CNTs nanomaterials consist of multi-walled carbon nanotubes and TiO wrapped on the outer surface of multi-walled carbon nanotubes 2 Nanoparticle layer and TiO 2 The surface of the nanoparticle layer is modified by MC-LR in situ molecular imprinting sites, and the base electrode is an FTO electrode. The electrode is obtained through the following steps:

[0051] (1) Pretreatment of multi-walled carbon nanotubes: weigh about 0.1g MWCNTs in 3M HNO 3 The solution was placed in a round-bottomed flask, condensed and refluxed in an oil bath at 110°C for 8 hours, and MWCNTs precipitated at the bottom of the round-bottomed flask at the end. After taking it out, wash it with distilled water until neutral. During the process, use a high-speed centrifug...

Embodiment 2

[0060] Adopt the MI-TiO that embodiment 1 prepares 2@CNTs / FTO sensing electrodes for photoelectrochemical detection of MC-LR.

[0061] Using the traditional three-electrode system to prepare MI-TiO 2 @CNTs / FTO is the working electrode, the saturated calomel electrode is the reference electrode, and the platinum wire electrode is the counter electrode, with 0.1mol / L Na 2 SO 4 The buffer solution is a supporting electrolyte solution. A series of MC-LR standard solutions with different concentrations were gradually added to the system by the standard addition method (every time the MC-LR standard solution was added to the supporting dielectric solution, it was diluted 1000 times). , apply a bias voltage of 0.6V, and use the I-t curve method to measure the photocurrent of the MC-LR system with different concentrations under full-wave light excitation, and convert it into photocurrent density (j) according to the working area of ​​the electrode. Through the analysis results, it...

Embodiment 3

[0063] Adopt the MI-TiO that embodiment 1 prepares 2 @CNTs / FTO sensing electrodes for selective performance detection.

[0064] MI-TiO prepared by 2 @CNTs / FTO is the working electrode, the saturated calomel electrode is the reference electrode, and the platinum wire electrode is the counter electrode, with 0.1mol / L Na 2 SO 4 The buffer solution is a supporting electrolyte solution. Apply 0.6V bias voltage, adopt I-t curve method to measure the photocurrent of the mixed system containing 0.1nM MC-LR solution and 100 times molar concentration of interfering substances in MC-LR respectively under full-wave light excitation, and calculate the relative photocurrent ratio (R ), to obtain the selectivity of the sensor. Interfering substances include monosultap, paraquat, omethoate, acetamiprid, atrazine, glyphosate or humic acid. The results showed that when containing monosultap, paraquat, omethoate, acetamiprid, atrazine and glyphosate at 100 times the molar concentration of M...

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Abstract

The invention relates to a microcystic toxin molecular imprinting functionalization TiO2@CNTs photoelectric sensor electrode and a photoelectric analysis method with the same. The electrode is composed of a substrate electrode and an MI-TiO2@CNTs nano-material covering the surface of the substrate electrode. The MI-TiO2@CNTs nano-material is composed of a multiwalled carbon nanotube and a TiO2 nano-particle layer, wherein the TiO2 nano-particle layer wraps the outer surface of the multiwalled carbon nanotube and is provided with MC-LR in-situ molecular imprinting sites. Compared with the prior art, the electrode greatly improves the photoelectric catalytic performance, and is good in selective recognition performance and adsorption enrichment performance for MC-LR and high in photoelectric detection sensitivity, and the limit of detection reaches 1.0*(10-12) mol.L-1; meanwhile, a preparation method is simple, an analysis method is quick and simple, good repeatability is achieved, and the method can be applied to detection analysis on trace contaminants.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemical analysis, in particular to a microcystin molecularly imprinted functionalized TiO 2 @CNTs photoelectric sensing electrode and photoelectric analysis method using the electrode. Background technique [0002] The microcystins produced by algal blooms have a great impact on public health and the environment, among which microcystin-LR (MC-LR) is a highly toxic hepatotoxin, and it is also one of the most toxic and common MCs 1. With human and animal liver as the target organ, long-term consumption of water containing this trace toxin can induce liver cancer; trace (10 -9 mol L -1 ) can cause harm; toxicity has bioaccumulation; but its chemical properties are stable and difficult to degrade under natural conditions; the World Health Organization (WHO) stipulates that the maximum content of MC-LR in drinking water is 1 μg / L. Therefore, its detection is of great significance to protect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N27/26G01N27/30
Inventor 刘梅川丁雪杨骐玮赵国华
Owner TONGJI UNIV
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