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Photoacoustic detection probe used for detecting Hg<2+> and preparation method thereof

A photoacoustic detection and probe technology, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of poor stability, limitations, and application of polluted water samples in the detection system, and achieve good stability and anti-interference The effect of high sensitivity and sensitivity

Active Publication Date: 2018-09-28
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of above-mentioned deficiencies in the prior art, the object of the present invention is to provide a kind of for Hg 2+ Detected photoacoustic detection probe and preparation method thereof, aiming at solving existing Hg 2+ The detection system has poor stability and poor color anti-interference, which limits the actual Hg 2+ Problems with Contaminated Water Sample Applications

Method used

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  • Photoacoustic detection probe used for detecting Hg&lt;2+&gt; and preparation method thereof
  • Photoacoustic detection probe used for detecting Hg&lt;2+&gt; and preparation method thereof
  • Photoacoustic detection probe used for detecting Hg&lt;2+&gt; and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] The preparation steps of the MTA-GNRs photoacoustic detection probe in this embodiment are as follows:

[0048] a) GNRs with characteristic absorption peak at 780nm were prepared according to the traditional one-pot seedless method, and centrifuged twice (9000g, 15min) to remove excess surfactant (cetyltrimethylammonium bromide) on the surface of GNRs.

[0049] b) Under the protection of nitrogen, the MTA solution and the hydrochloric acid solution were sequentially added to the centrifuged GNRs solution, stirred and reacted for 4 hours, and then centrifuged (9000g, 10min) to remove excess MTA. The pH of the prepared MTA-GNRs photoacoustic detection probe was adjusted to 2.5 to ensure its stability before detection.

Embodiment 2

[0051] Prepare a final concentration of 100 μM Hg with deionized water 2+ Stock solution, take 0.1mL and add it to the 0.9mL MTA-GNRs photoacoustic detection probe solution (0.12nM) prepared in Example 1, stir gently, keep the mixture at room temperature for 1 minute, and then add deionized water As a control group, the samples were detected by a UV-Vis spectrophotometer. Such as figure 2 Shown, adding Hg 2+ Afterwards, the solution changed from orange to blue-purple, and the ultraviolet absorption at 780nm decreased, and the hydraulic diameter of the MTA-GNRs photoacoustic detection probe increased from 53nm to 207nm, and the aggregation of the probe can be seen through the TEM image.

Embodiment 3

[0053] In order to evaluate the MTA-GNRs photoacoustic detection probe that embodiment 1 prepares to Hg 2+ Selectivity of detection, all metal salts including Ca 2+ 、Cd 2+ 、Cu 2+ , Fe 3+ , Hg 2+ , Mg 2+ , Mn 2+ , Pb 2+ and Zn 2+ Both were prepared with deionized water to make 100 μM metal ion solutions. Mix 0.1 mL of each metal ion solution with 0.9 mL of MTA-GNRs photoacoustic detection probe. After incubation for 1 minute, the photoacoustic signal of each sample was detected with deionized water as the control. Such as image 3 As shown, compared with the control group and other ions, only the addition of Hg 2+ The photoacoustic signal of the MTA-GNRs photoacoustic detection probe solution at 780 nm was significantly enhanced.

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Abstract

The invention discloses a photoacoustic detection probe used for detecting Hg<2+> and a preparation method thereof. The photoacoustic detection probe is composed of gold nano particles and (11-mercaptoundecyl)-trimethyl ammonium bromide combined with the surface of the gold nano particles, and the gold nano particles and (11-mercaptoundecyl)-trimethyl ammonium bromide are combined through an Au-Sbond. The MTA-GNPs photoacoustic detection probe has the characteristics of specificity and high sensitivity on Hg<2+>. More importantly, compared with a traditional colorimetric detection system based on the gold nano particles, the photoacoustic detection probe has good stability and interference immunity, and can be used for practical Hg<2+> contaminated water sample.

Description

technical field [0001] The invention relates to the technical field of photoacoustic detection probes, in particular to a method for Hg 2+ A photoacoustic detection probe for detection and a method for preparing the same. Background technique [0002] Mercury (mercury) is a common heavy metal pollutant that can pose serious hazards to humans and the environment even at low concentrations. Mercury ion (Hg 2+ ) is one of the main forms of mercury in nature. Currently, common Hg 2+ The detection methods mainly include gas chromatography (GC), high performance liquid chromatography (HPLC), mass spectrometry (MS) or inductively coupled plasma mass spectrometry (ICPMS). However, these methods are very complicated for sample pretreatment, so it is urgent to develop a simple method for Hg 2+ detection. [0003] With the rapid development of nanotechnology, many nanomaterials such as gold nanoparticles, silver nanoparticles, carbon nanomaterials, quantum dots and silica nanopar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCG01N21/1702
Inventor 黄鹏黄艳林静
Owner SHENZHEN UNIV