Preparation method and application of Au NPs coated WP5/BiOBr composite material

A composite material and mixed solvent technology, applied in the field of photoelectrochemistry, can solve the problems of requiring special operators, environmental pollution, low sensitivity of detection technology, etc.

Pending Publication Date: 2021-07-30
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a preparation method and application of an Au NPs@WP5/BiOBr composite material, which solves the problems of low sensitivity, limited detection range, ser...

Method used

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  • Preparation method and application of Au NPs coated WP5/BiOBr composite material
  • Preparation method and application of Au NPs coated WP5/BiOBr composite material
  • Preparation method and application of Au NPs coated WP5/BiOBr composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of Au NPs@WP5 / BiOBr composite material, the steps are:

[0034] Step 1, preparing bismuth oxybromide nanoflowers: 0.485g Bi(NO) 3˙ 5H 2 O was added to 30 mL of mixed solvent, the mixed solvent (V 水 :V 乙二醇 = 1:5), a transparent solution was obtained after ultrasonic dispersion, 0.4 g of PVP was added, stirred for 30 min, and then 0.119 g of KCl was added and stirred for 30 min to obtain a white suspension solution. The white suspension was poured into an autoclave, reacted in an oven at 160 °C for 3 h, and dried by centrifugation to obtain a pale yellow powder of BiOBr, that is, bismuth oxybromide nanoflowers.

[0035] Step 2, prepare gold nanoparticles by reducing chloroauric acid: take 150 mL of deionized water, heat it to boiling, add 0.9 mL of H 3 cit (0.1 M), 2.1 mL Na 3 cit (0.1 M), stirred for 15 min, injected 1 mLHAuCl 4 (25.4 mM), continue to stir for 3 min, put into ice water to quench to obtain wine red Au NPs aqueous solution; centr...

Embodiment 2

[0040] Physical characterization:

[0041] Morphology determination of BiOBr, Au NPs@WP5 / BiOBr.

[0042] figure 1 (a) and (b) are the transmission electron microscope images of the BiOBr nanoflowers prepared in step 1 and the Au NPs@WP5 / BiOBr prepared in step 5 in Example 1, respectively. The results show that the diameter of the synthesized BiOBr nanoflowers can be observed in diagram (a) is 400-450 nm, and the dispersion is uniform. It can be seen from the diagram (b) that the prepared Au NPs@WP5 are relatively uniformly dispersed in the sheets of BiOBr nanoflowers, which indicates the successful preparation of Au NPs@WP5 / BiOBr composites.

[0043] XRD powder diffraction and infrared characterization of Au NPs@WP5 / BiOBr composites.

[0044] figure 2 is the XRD powder diffraction pattern of BiOBr, Au NPs, Au NPs@WP5, and Au NPs@WP5 / BiOBr composite materials prepared in step 5. It can be seen from the figure that for Au NPs@WP5 / BiOBr, at 21.51°, 25.07°, 25.29°, 43.90°, a...

Embodiment 3

[0046] Electrochemical property test of dopamine:

[0047] 10 μL of Au NPs@WP5 / BiOBr obtained in the above Example 1 was drop-coated on the surface of GCE, and dried beside an infrared lamp at 50 °C to obtain Au NPs@WP5 / BiOBr modified GCE. Dissolve dopamine in PBS with PH=7.0 as the test object. Through the traditional three-electrode method, use a xenon lamp to simulate a visible light source to irradiate the surface of the GCE electrode, control the shading interval as an adjustable "on-off", and then use the electrochemical workstation Perform photoelectrochemical detection.

[0048] Electrochemical Characterization:

[0049] As shown in Figure 3, by adding 5.0 mM K 3 [Fe(CN) 6 ] / K 4 [Fe(CN) 6 ] and 0.1 M KCl solution to explore the electrochemical activity of BiOBr / GCE, Au NPs@WP5 / GCE and Au NPs@WP5 / BiOBr / GCE electrodes. It can be clearly seen that compared with BiOBr / GCE and Au NPs@WP5 / GCE, Au NPs@WP5 / BiOBr / GCE has the largest oxidation peak current value, which may...

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Abstract

The invention discloses an Au NPs coated WP5/BiOBr composite material as well as a preparation method and application thereof. The Au NPs coated WP5/BiOBr composite material is prepared by loading Au NPs coated WP5 in a bismuth oxybromide nanoflower lamella, the Au NPs coated WP5/BiOBr composite material is modified on the surface of a glassy carbon electrode, and the Au NPs coated WP5/BiOBr composite material is prepared by utilizing the local surface plasma effect of gold nanoparticles under visible light. The host-guest complexing effect of water-soluble pillararene and the photogenerated electron hole acceleration redox reaction of BiOBr under visible light illumination are cooperated to detect the dopamine in the solution. Bovine hemoglobin with different concentrations is sequentially dropwise added into the solution, an electric signal generated by dopamine can be weakened, so that indirect detection of the bovine hemoglobin is achieved, the detection range is 10<-11>-10<-1> mg/mL, and the detection limit is 4.2* 0<-12> mg/mL.

Description

technical field [0001] The invention relates to the field of photoelectrochemical technology, in particular to a preparation method and application of an Au NPs@WP5 / BiOBr composite material. Background technique [0002] Hemoglobin (Hb), also known as hemoglobin, is an essential substance for the human body and the main component of red blood cells. It can combine with oxygen and transport oxygen and carbon dioxide. The hemoglobin level can well reflect the degree of anemia. The normal range of hemoglobin in the human body is: male 130-175 g / L; female 115-150 g / L; newborn 170-200 g / L. Decreased hemoglobin can cause various anemias (such as aplastic anemia, iron deficiency anemia, sideroblastic anemia, megaloblastic anemia, hemolytic anemia, thalassemia, etc.), massive blood loss (such as traumatic bleeding, surgical Hemorrhage, postpartum hemorrhage, acute gastrointestinal bleeding, chronic blood loss caused by ulcer, etc.), leukemia, postpartum, chemotherapy, hookworm dis...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/30G01N27/327B82Y15/00B82Y40/00
CPCG01N27/48G01N27/308G01N27/3278B82Y15/00B82Y40/00
Inventor 周琳王锦陈婷婷卑佳丽
Owner NANTONG UNIVERSITY
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