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Photoelectrochemical analysis method based on pd quantum dots modified tio2 nanorods and its application

An analysis method, nanorod technology, applied in chemical analysis by catalysis, analysis by making materials undergo chemical reactions, electrochemical variables of materials, etc., can solve the problem that it is difficult to effectively realize the reduction and desorption of chlorinated organic chemicals. Halogen and other problems, to achieve good reproducibility, improve selectivity, high selectivity effect

Inactive Publication Date: 2019-01-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Nano-TiO 2 The photogenerated electrons generated by photocatalysis (e - ) has a reducing effect, but it has been found through reports in recent years that it is difficult to effectively realize the reduction and dehalogenation of chlorinated organic chemicals when there is no co-catalyst

Method used

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  • Photoelectrochemical analysis method based on pd quantum dots modified tio2 nanorods and its application
  • Photoelectrochemical analysis method based on pd quantum dots modified tio2 nanorods and its application
  • Photoelectrochemical analysis method based on pd quantum dots modified tio2 nanorods and its application

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Effect test

Embodiment 1

[0041] A Modified TiO Based on Pd Quantum Dots 2 Nanorod photoelectrochemical analysis method, the working electrode is Pd quantum dot modified TiO 2 Nanorods are obtained through the following steps:

[0042] Using low-temperature hydrothermal method to prepare molecularly imprinted (SC, MI)-TiO with template molecule PCB101 on FTO substrate 2 NRs electrode; the electrode is calcined in a muffle furnace at 500℃ to remove the template molecules to obtain TiO 2 Nanorods; 800mg polyvinylpyrrolidone (PVP), 9mg palladium chloride (PdCl 2 ) And 300mg NaI in 13ml H 2 In O, after stirring evenly, transfer the above mixed solution into a 25ml polytetrafluoro stainless steel autoclave. TiO 2 The nanorods were placed in the mixed solution and reacted hydrothermally for 1.5 hours at a constant temperature of 180°C. After cooling to room temperature, the electrode was taken out and washed with double distilled water, and the surface was dried with nitrogen to obtain Pd quantum dot modified Ti...

Embodiment 2

[0050] A Modified TiO Based on Pd Quantum Dots 2 The photoelectrochemical analysis method of nanorods includes the following steps:

[0051] (1) Dissolve PCB101 in distilled water and prepare a concentration range of 10 -10 ~10 -7 Multiple sets of PCB101 standard solutions of mol / L;

[0052] (2) Preparation of Pd quantum dots modified TiO 2 Nanorods: (SC, MI)-TiO with template molecule PCB101 molecular imprinting was prepared on FTO substrate by low-temperature hydrothermal method 2 NRs electrode, and (SC,MI)-TiO 2 The NRs electrode is placed in a muffle furnace and calcined at 400°C to remove the template molecules to obtain TiO 2 Nanorods; then mix polyvinylpyrrolidone, palladium chloride, and NaI in a mass ratio of 800:5:200, and add them to 10mL of distilled water to obtain a mixed solution; then combine the TiO obtained in step (a) 2 The nanorods and the mixed solution obtained in step (b) are placed in a reactor, reacted at 150°C for 1 hour, cooled, washed with distilled water,...

Embodiment 3

[0057] A test method similar to that of Example 2 is adopted, and the specific steps are as follows:

[0058] (1) Dissolve PCB101 in distilled water and prepare a concentration range of 10 -10 ~10 -7 Multiple sets of PCB101 standard solutions of mol / L;

[0059] (2) Preparation of Pd quantum dots modified TiO 2 Nanorods: (SC, MI)-TiO with template molecule PCB101 molecular imprinting was prepared on FTO substrate by low-temperature hydrothermal method 2 NRs electrode, and (SC,MI)-TiO 2 The NRs electrode is placed in a muffle furnace and calcined at 500℃ to remove the template molecules to obtain TiO 2 Nanorods; then mix polyvinylpyrrolidone, palladium chloride, and NaI in a mass ratio of 800:10:500 and add them to 20mL of distilled water to obtain a mixed solution; then combine the TiO obtained in step (a) 2 The nanorods and the mixed solution obtained in step (b) are placed in a reactor, reacted at 100°C for 1 hour, cooled, washed with distilled water, and N 2 Blow dry to get the Pd ...

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Abstract

The invention relates to a Pd quantum dot-modified TiO2 nanorod-based photoelectric chemical analysis method and application thereof. By means of making a relational diagram of the concentration of a standard PCB 101 solution and current, the concentration of PCB 101 in a to-be-measured solution can be obtained. Compared with the prior art, by constructing a Pd quantum dot-modified TiO2 nanorod with efficient photoelectric catalytic reduction activity, the method realizes efficient reduction for the PCB 101, obtains sensitive cathode photocurrent and realizes photoelectric chemical detection for the PCB 101; furthermore, due to the introduction of molecularly imprinted loci and the establishment of a reaction type analysis method, the selectivity of the analysis method is further improved, and the interference of coexisting easily oxidized pollutants in environmental water with PCB 101 detection is greatly reduced. The method is simple and easy to implement and high in sensitivity, has a limit of detection reaching up to 10-13mol / L, is stable in electrodes and has good reproducibility.

Description

Technical field [0001] The invention relates to the field of photoelectrochemical analysis methods, in particular to a modified TiO based on Pd quantum dots 2 Nanorod photoelectrochemical analysis method and its application. Background technique [0002] Polychlorinated biphenyls (PCBs) are a kind of ubiquitous and extremely stable chlorinated aromatic compounds. They are one of the persistent organic pollutants that are of wide concern around the world. They are carcinogenic, endocrine disrupting, bioconcentration and environmental persistence. Features. The development of rapid and accurate detection methods to reflect the overall distribution and toxicity of PCBs in the environment is of great significance to the protection of the environment and human health. There are 209 kinds of PCBs homologues. Due to the difference in the substitution number and substitution position of chlorine, the biochemical and toxicological reactions caused by different PCBs homologues are diversi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/30G01N21/75G01N21/76G01N31/10
CPCG01N21/75G01N21/76G01N27/26G01N27/30G01N31/10G01N2021/757
Inventor 史慧杰赵金芝赵国华
Owner TONGJI UNIV
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