Preparation method and application of MOFs composite TiO2 photoactive material electrode

A composite electrode and photoactive technology, applied in the direction of material electrochemical variables, color/spectral characteristic measurement, material analysis using wave/particle radiation, etc., to achieve enhanced sensitization effect, high light absorption efficiency, and improved conversion efficiency

Pending Publication Date: 2021-11-05
广东五研检测技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many challenges and difficulties in the preparation of MOFs derivatives with specific structures and retained functionalization for the construction of high-performance photoactive composites.

Method used

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  • Preparation method and application of MOFs composite TiO2 photoactive material electrode
  • Preparation method and application of MOFs composite TiO2 photoactive material electrode
  • Preparation method and application of MOFs composite TiO2 photoactive material electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A kind of MOFs composite TiO 2 Preparation methods of photoactive material electrodes, such as figure 1 As shown, it mainly includes the following steps:

[0053] 1. Synthesis of HKUST-1 octahedron

[0054] HKUST-1 was prepared by hydrothermal solvent method. Mainly include: weigh 0.535g Cu(NO 3 ) 2 ·3H 2 O (2.21mmol) and 0.234g BTC (tribenzoic acid) (1.11mmol) were added to 8mL of deionized water and 8mL of ethanol solution respectively, after stirring for 15min, the two solutions were mixed and ultrasonicated under the condition of 50W power Treat for 10 min to obtain a uniformly dispersed mixed solution. Then, the mixture was transferred to a 100 mL stainless steel reactor and kept at 120 °C for 24 h. Naturally cooled to room temperature, centrifuged with water / ethanol (1:1, volume ratio) (8000rpm, 10min) to wash the product three times, and finally, the precipitate was vacuum-dried at 60°C for 12h to obtain blue HKUST-1 particles . Scanning electron microsc...

Embodiment 2

[0063] A composite TiO based on MOFs 2 The preparation method of the photoelectrochemical biosensor of photoactive material electrode, its schematic diagram, such as figure 1 shown. Taking the biosensor for detecting Escherichia coli toxin DNA as an example, its specific preparation method is as follows:

[0064] The DNA sequence adopted in this embodiment is as follows:

[0065] Capture probe sequence (S1): 5'-NH 2 -(CH 2 ) 6 -GAG CGG CGC AAC ATT TCA GGT CGA-3';

[0066] Complementary sequence (S2): 5'-TCG ACC TGA AAT GTT GCG CCG CTC-3';

[0067] Single base mismatch sequence (S3): 5'-TCG ACC TGA AAT GTT GCG CCT CTC-3';

[0068] Three base mismatch sequence (S4): 5'-TCG TCC TGA AAC GTT GCG CCT CTC-3';

[0069] Non-complementary sequence (S5): 5'-GCA CGG CGC AAC ATT TCA GGT CGA-3';

[0070] Using EDC / NHS as activator to convert 5'-NH 2 The modified probe NDA was covalently immobilized on the surface of the modified electrode through amidation reaction. The preparati...

experiment example 1

[0073] Application of the photoelectrochemical (PEC) biosensor prepared in Example 2 in the detection of Escherichia coli toxin DNA (S2)

[0074] The analytical performance of the probe (S1) modified electrode is as follows: Figure 10 Shown in B. Under optimal experimental conditions, the prepared two PEC biosensors with increasing target DNA concentration (C S2 ) hybridization reaction, the photocurrent signal obtained gradually decreases, and their photocurrent change value (ΔI) is related to the logarithm of the DNA concentration (log C S2 ) show a good correspondence. For S1 / CS / HKUST-1 / TiO 2 / ITO sensor, its detection linear range is 1.0×10 -6 nM~4.8×10 -2 nM, the detection limit based on 3 times the signal-to-noise ratio (S / N=3) is 6.31×10 -7 nM, the linear regression equation is ΔI(10 -7 A)=0.6052-0.2023log(C S2 / M)(R 2 =0.9969)( Figure 10 C). For S1 / HKUST-CuO / TiO 2 / ITO sensing platform ( Figure 8 E and F), which exhibit a wider linear detection range (1...

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Abstract

The invention belongs to the technical field of photoelectrochemical analysis, and particularly relates to a preparation method and application of an MOFs composite TiO2 photoactive material electrode. The preparation method comprises the following steps of S01, preparing HKUST-1, S02, dropwise adding the TiO2 dispersion liquid on an ITO electrode, S03, preparing an HKUST-1/TiO2/ITO modified electrode, and S04, preparing a CS/HKUST-1/TiO2/ITO composite electrode. The step S04 is replaced by the step S04', and the step S04' comprises the substeps that the HKUST-1/TiO2/ITO modified electrode obtained in the step S03 is heated to 300-380 DEG C at the speed of 8-12 DEG C/min, roasted for 0.8-1.5 h and cooled, and then the HKUST-CuO/TiO2/ITO composite electrode is obtained. The hollow and thin-layer defect structure of HKUST-CuO is beneficial to enhancing the multiple diffuse reflection effect on visible light, a sensor platform can be further applied to high-sensitivity detection of other biomolecules such as alpha fetoprotein (AFP), lincomycin (Lin) and heavy metal ions Hg<2+>, and meanwhile, the composite material also has an obvious effect on catalytic degradation of dye molecules.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemical analysis, in particular to a kind of MOFs composite TiO 2 Preparation method and application of photoactive material electrode. Background technique [0002] Photoelectrochemical (PEC) technology inherits many advantages of electrochemical methods such as simple construction, portability, and ease of operation. However, the PEC analysis method has a lower overpotential than the electrochemical method, and thus has the potential to be more reliable for the construction of high-sensitivity sensors. Recently, in the field of biochemical biomolecular detection such as specific DNA sequences, microscopic RNA molecules, protein active enzymes, and organophosphorus pesticide residues, PEC analysis techniques have received extensive attention. For the construction of PEC biosensors, photoactive materials on the sensing interface are functionalized biorecognition substrates such as nucleic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/227G01N27/26G01N21/33
CPCG01N23/227G01N27/26G01N21/33G01N2223/084
Inventor 吴亚宜杨汉贵谢葳蔡长寿谢文嘉金淼许思捷杨翰林剑峰柯桂沁陈雪丽陈少勉杨晓生吴晓仰杨凡
Owner 广东五研检测技术有限公司
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