An in situ molecularly imprinted functionalized cds/3dom TiO 2 Photoelectric analysis method of benzopyrene at /BDD electrode

A technology of molecular imprinting and photoelectric analysis, applied in the direction of material electrochemical variables, can solve the problems of low sensitivity and complicated operation, achieve low background current, good stability and reproducibility, and improve accuracy and precision.

Inactive Publication Date: 2017-08-25
TONGJI UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide an in-situ molecularly imprinted functionalized CdS / 3DOM TiO solution for the shortcomings of the existing benzopyrene (BaP) detection technology, such as low sensitivity and complicated operation. 2 Photoelectric analysis method of benzopyrene at / BDD electrode

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  • An in situ molecularly imprinted functionalized cds/3dom TiO <sub>2</sub> Photoelectric analysis method of benzopyrene at /BDD electrode
  • An in situ molecularly imprinted functionalized cds/3dom TiO <sub>2</sub> Photoelectric analysis method of benzopyrene at /BDD electrode

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Embodiment 1

[0027] A functionalized CdS / 3DOM TiO based on in situ molecular imprinting 2 / BDD electrode for photoelectrochemical analysis of BaP, the electrode is constructed by the following steps:

[0028] 1) Pretreatment of BDD electrodes:

[0029] The BDD electrode to be treated was used as the working electrode, the platinum wire electrode was used as the auxiliary electrode, and the saturated calomel electrode was used as the reference electrode. -1 h 2 SO 4 In the solution, use the multi-step potential method (-3.5V, 10s; 3.5V, 10s) to clean for 30min, then take out the BDD electrode, and wash it with deionized water, then put it in aqua regia water bath and boil for 15min, and finally put the electrode in deionized Water, acetone, and deionized water were ultrasonically cleaned for 3 minutes, and then dried naturally to obtain a clean BDD electrode.

[0030] 2) 3DOM TiO 2 preparation of

[0031] Using the hard template method combined with the sol-gel method, the pretreated...

Embodiment 2

[0036] Prepare a series of 0.1 mol L of BaP with different concentrations -1 PBS (containing 0.1 mol·L -1 AA, PH=7.4) standard solution was added to the electrolytic cell as the electrolyte, and the BaP in situ molecular imprinting functionalized CdS / 3DOM TiO prepared in Example 1 2 The / BDD electrode was used as the working electrode, the platinum wire electrode was used as the auxiliary electrode, and the saturated calomel electrode was used as the reference electrode. The above three-electrode system was placed in the electrolyte and stirred for 5 minutes before standing still. Using electrochemical workstation CHI660C, the photocurrent was measured by chronoamperometry under the irradiation of visible light with 0 V bias applied. Firstly, measure the electrode in blank electrolyte solution 0.1 mol L -1 PBS (containing 0.1 mol·L -1 AA, PH=7.4) and the photocurrent after adding different concentrations of BaP standard solutions, and then convert the photocurrent densi...

Embodiment 3

[0038] Measure the blank solution 0.1 mol·L respectively -1 PBS (containing 0.1 mol·L -1 AA, PH=7.4) and 0.1 mol·L containing a certain concentration of BaP -1 PBS (containing 0.1 mol·L -1 AA, PH=7.4) standard solution and 0.1 mol L containing the same concentration of BaP interfering substances (such as benzene, naphthalene, pyrene) -1 PBS (containing 0.1 mol·L -1 AA, PH=7.4) solution was used as the electrolyte, and the three-electrode system as described in Example 2 was used to measure the corresponding photocurrents of different electrolytes, and the respective photocurrent densities of different electrolytes were obtained by calculating the working area of ​​the working electrode. The results show that the photocurrent density in the above-mentioned electrolytes containing BaP and interfering substances has increased to varying degrees compared with the blank electrolyte, but the influence of the photocurrent density on the detection of BaP is less than 22%, whi...

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Abstract

The invention relates to a photoelectric analysis method of in-situ molecular imprinting functionalized CdS / 3DOM TiO2 / BDD electrode for benzopyrene. Firstly, the hard template method combined with the sol-gel method was used to construct 3DOM TiO2 on the surface of BDD, and then the BaP in situ molecularly imprinted functionalized CdS nanoparticles were assembled by the continuous ion layer adsorption reaction method to construct the CdS / 3DOM TiO2 / BDD photoelectrochemical sensor . The invention can realize highly sensitive and selective detection of BaP by means of catalytic species selection and microstructure control of the photoelectric sensor. The present invention uses in-situ molecularly imprinted functionalized CdS nanoparticles as selective recognition elements, which has more stable imprinting sites and selectivity; the three-dimensional macroporous structure of TiO2 has a higher spatial specific surface area, which is not only beneficial to the recognition of element CdS Evenly loaded, and can form a heterojunction with CdS, so that the electrode can obtain visible photoelectric response capability, and at the same time improve the separation efficiency of photogenerated electrons and holes, so that the electrode has a stable and efficient visible light response. Under visible light irradiation, the sensing electrode is used to perform photoelectric analysis and detection of BaP in water samples, and the detection limit reaches the order of 10‑14mol·L‑1.

Description

technical field [0001] The invention belongs to the technical field of environmental detection and relates to a functionalized CdS / 3DOMTiO based on in-situ molecular imprinting 2 A photoelectrochemical analysis method for benzopyrene (BaP) at the / BDD electrode. Background technique [0002] Benzopyrene (BaP) is a common polycyclic aromatic hydrocarbon environmental pollutant, which is mainly produced by incomplete combustion of coal, petroleum, wood, organic polymer compounds, etc., and widely exists in the atmosphere, water, soil and food. The first environmental chemical carcinogen to be discovered is also the most carcinogenic among polycyclic aromatic hydrocarbons, and it is used as an important indicator for monitoring the pollution of polycyclic aromatic hydrocarbons in the environment. Therefore, the highly sensitive and selective quantitative analysis of BaP is of great environmental significance. [0003] The traditional detection methods of BaP mainly include tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 刘梅川雒彩芳赵国华
Owner TONGJI UNIV
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