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Pd quantum dot-modified TiO2 nanorod-based photoelectric chemical analysis method and application thereof

An analytical method and nanorod technology, which are applied in chemical analysis by catalysis, analysis by chemical reaction of materials, electrochemical variables of materials, etc. Halogen and other problems, to achieve good reproducibility, selectivity improvement, and selectivity improvement effects

Inactive Publication Date: 2016-10-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Pd quantum dot-modified TiO2 nanorod-based photoelectric chemical analysis method and application thereof
  • Pd quantum dot-modified TiO2 nanorod-based photoelectric chemical analysis method and application thereof
  • Pd quantum dot-modified TiO2 nanorod-based photoelectric chemical analysis method and application thereof

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Embodiment 1

[0041] A modified TiO based on Pd quantum dots 2 Photoelectrochemical analysis method of nanorods, the working electrode is Pd quantum dots modified TiO 2 Nanorods, obtained by the following steps:

[0042] Molecularly imprinted (SC,MI)-TiO with template molecule PCB101 prepared on FTO substrate by low-temperature hydrothermal method 2 NRs electrode; and the electrode is calcined in a muffle furnace at 500 ° C to remove template molecules and obtain TiO 2 Nanorods; 800mg polyvinylpyrrolidone (PVP), 9mg palladium chloride (PdCl 2 ) and 300mg NaI in 13ml H 2 O, after stirring evenly, the above mixed solution was transferred to a 25ml polytetrafluoro stainless steel autoclave. TiO 2 The nanorods were placed in the mixed solution, and subjected to a hydrothermal reaction at a constant temperature of 180° C. for 1.5 h. After cooling to room temperature, the electrode was taken out and washed with twice distilled water, and the surface was blown dry with nitrogen to obtain Pd ...

Embodiment 2

[0050] A modified TiO based on Pd quantum dots 2 The photoelectrochemical analysis method of nanorods comprises the following steps:

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

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

Embodiment 3

[0057] Adopt similar testing method with embodiment 2, its concrete steps are as follows:

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

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

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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 Pd quantum dot-based modified TiO 2 Nanorod photoelectrochemical analysis method and its application. Background technique [0002] Polychlorinated biphenyls (PCBs) are a class of ubiquitous and extremely stable chlorinated aromatic compounds. They are one of the persistent organic pollutants that are widely concerned worldwide. They have carcinogenicity, endocrine disruption, bioaccumulation and environmental persistence. Features. The development of rapid and accurate detection methods to reflect the distribution and toxicity of PCBs compounds in the environment as a whole is of great significance to the protection of the environment and human health. There are 209 homologues of PCBs. Due to the difference in the number and position of chlorine substitution, the biochemical and toxicological reactions caused by different homologues of PCBs are diversifie...

Claims

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Application Information

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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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