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Method of measuring concentration of H2O2 with self-driving Janus particles

A technology of hydrogen peroxide concentration and hydrogen peroxide, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low sensitivity of detection means and easy to be interfered by external factors, and achieve good stability, fast and accurate determination method Effects of Accuracy and Precision

Inactive Publication Date: 2017-08-29
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects and deficiencies of the existing preparation technology, the purpose of the present invention is to provide a method for measuring the concentration of hydrogen peroxide using self-driven light scattering technology, so as to solve the problems of low sensitivity of existing detection methods and being easily interfered by external factors

Method used

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  • Method of measuring concentration of H2O2 with self-driving Janus particles
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  • Method of measuring concentration of H2O2 with self-driving Janus particles

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Embodiment 1

[0031] Place the silicon wafer in a plasma cleaning machine for surface modification, and the nominal diameter is φ1μm SiO 2 The aqueous solution of microspheres is evenly dropped on the silicon wafer, and the silicon wafer is placed on a homogenizer and rotated to spread the microspheres evenly. After a period of natural volatilization, tightly arranged SiO 2 microsphere monolayer structure; after that, the SiO 2 A Pt layer about 5nm thick is evaporated on the surface of the microspheres, thus obtaining the required Pt-SiO 2 Type Janus granules.

[0032] Scrape 12cm from silicon wafer 2 Janus particles into a glass bottle, add 2200 μl ultrapure water into the glass bottle to get Pt-SiO 2 Type Janus particle suspension. Sonicate the Janus particle suspension for 3 minutes to deagglomerate, then centrifuge in a centrifuge, and take the supernatant to obtain the desired Pt-SiO 2 Type Janus particle suspension.

Embodiment 2

[0034] Prepare hydrogen peroxide solutions with concentrations of 0%, 2.0%, 4.0%, and 6.0%, respectively, and mix 550 μl of the Janus particle suspension prepared in Example 1 with the hydrogen peroxide solutions of these four concentrations in the sample cell in equal volumes , the concentrations of hydrogen peroxide in the mixed solution were 0%, 1.0%, 2.0%, and 3.0%, respectively. Using a multi-angle dynamic / static laser light scattering instrument (model Nano ZS90) to measure Pt-SiO in four mixed liquids 2 Diffusion coefficient of type Janus particles. A set of data is obtained by taking the average value of multiple measurements, and multiple sets of data are measured for each sample. Finally, the hydrogen peroxide concentration and Pt-SiO 2 The relationship equation for the diffusion coefficient of Janus-type particles is: y=0.0249x+0.3919, where y represents Pt-SiO 2 The diffusion coefficient of type Janus particles in hydrogen peroxide, x represents the concentratio...

Embodiment 3

[0037] For a certain hydrogen peroxide solution (a known concentration of 8.0%), get 550 μl of hydrogen peroxide solution and 550 μl of the Pt-SiO obtained in Example 1 2 The type Janus particle suspension is mixed in the sample cell, and the concentration of hydrogen peroxide in the mixture is 4.0%. Using a multi-angle dynamic / static laser light scattering instrument (model Nano ZS90) to measure Pt-SiO in the mixed solution 2 Diffusion coefficient of type Janus particles. The measured diffusion coefficient of the Janus particles was 0.483, and the concentration of the hydrogen peroxide solution was obtained as 3.7% through the relationship equation between the diffusion coefficient and the concentration of hydrogen peroxide obtained in Example 2.

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Abstract

The invention discloses a method of measuring concentration of H2O2 with self-driving Janus particles. The method includes the steps of: a) quantifying the concentration and volume of a self-driving Janus particle suspension liquid and measuring the diffusion coefficient of the self-driving Janus particle suspension liquid in H2O2 solutions in different concentrations under the concentration and the volume, thus acquiring the relationship between the H2O2 concentrations and the diffusion coefficient of the self-driving Janus particles; and b) mixing a H2O2 solution in unknown concentration with the self-driving Janus particle suspension liquid, measuring the diffusion coefficient of the self-driving Janus particles in the mixture liquid, and acquiring the concentration of the H2O2 by means of the relationship between the H2O2 concentrations and the diffusion coefficient of the self-driving Janus particles. The method is quick and has good stability, is free of influence due to other interference factors, and has excellent accuracy and precision in measurement results.

Description

technical field [0001] The invention belongs to the field of hydrogen peroxide monitoring, in particular to a method for detecting hydrogen peroxide in water samples, in particular to a method for measuring the concentration of hydrogen peroxide by using self-driven Janus particles. Background technique [0002] As an important chemical product, hydrogen peroxide has multiple functions such as bleaching, oxidation and disinfection. It is widely used in textile industry, chemical industry, paper industry, environmental protection industry, electronics industry, food hygiene industry and other fields. Therefore, the determination of hydrogen peroxide is of great significance to these fields. Now detect H 2 o 2 The main methods used are fluorescence, chemiluminescence, spectroscopy and titration. Among them, the iodometric method is widely used in factories to detect the hydrogen peroxide content in the bleaching process. This method is simple to operate, but has low sensit...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 刘金豪崔海航张鸿雁陈力王雷磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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