Mercury-ion nanometer sensor and preparing method and application thereof

An ion sensor and mercury ion technology are applied in the field of mercury ion nanosensors and their preparation, achieving the effects of high sensitivity, wide application prospects, and omitting sample pretreatment steps.

Active Publication Date: 2017-04-26
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this immobilized quantum dot heavy metal

Method used

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  • Mercury-ion nanometer sensor and preparing method and application thereof
  • Mercury-ion nanometer sensor and preparing method and application thereof
  • Mercury-ion nanometer sensor and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1. Preparation of ion sensor

[0037] 1) Remove the coating layer of about 2.5cm from the silica fiber with a diameter of 600μm and a length of 5cm, soak the part of the removed coating layer in 30% hydrofluoric acid, and take out the fiber when its diameter is reduced to about 230μm. At this time, a tapered structure is formed, and the taper angle is about 0.5 cm long. The tapered fiber can ensure that the fluorescence is transmitted in the form of total reflection in the fiber, thereby improving the transmission efficiency of the fluorescence.

[0038] 2) Hydroxylation of optical fiber: immerse the tapered optical fiber to 30% H 2 O 2 / Concentrated H 2 SO 4 (v / v,3:1) In the mixed solution, take out the optical fiber after 30 minutes at room temperature, and rinse it with ultrapure water until the pH of the cleaning solution is neutral, and finally dry it with nitrogen at room temperature and store in a vacuum drying box spare.

[0039] 3) Silanization of optical fi...

Example Embodiment

[0042] Example 2. Using the ion sensor obtained in Example 1 to detect mercury ion spiked water sample

[0043] 1) Install the ion sensor prepared in Example 1 to figure 2 In the sensing platform shown, the tapered end of the optical fiber extends into the sample channel, and the other end is connected to the excitation light transmission device and the fluorescence collection device through an optical fiber coupler, and the fluorescence signal generated by the detection end is collected and converted into electricity. Signal output

[0044] 2) A series of 200 μl mercury ion standard solutions with a concentration in the range of 5 to 1000 nM are sequentially injected into the sample channel. The mercury ions entering the channel will interact with the quantum dots on the surface of the optical fiber, causing its fluorescence intensity to change. After each sample is tested, follow step 1) to replace the optical fiber.

[0045] The real-time signal curve corresponding to each conce...

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Abstract

The invention discloses a mercury-ion nanometer sensor and a preparing method and application thereof. The mercury-ion nanometer sensor is composed of an optical fiber and carboxylation quantum dots, wherein the surface of one end of the optical fiber is coated with the carboxylation quantum dots. In the mercury-ion nanometer sensor, the optical fiber is a quartz optical fiber; the optical fiber coated with the carboxylation quantum dots is conical. The carboxylation quantum dots are CdSe/ZnS shell-type quantum dots, wherein carboxyl is modified on the surfaces of the carboxylation quantum dots; the maximum emission wavelength of the carboxylation quantum dots is 605 nm. According to the mercury-ion nanometer sensor and the preparing method and application thereof, the particle aggregation problem caused by the conditions such as pH and the ion strength is solved, the multiple sample pretreatment steps are omitted, and the mercury-ion nanometer sensor also has the higher signal response speed. In addition, the method has the high sensitivity (a detection limit is the nM magnitude order), the requirements of mercury control indexes in various water quality standards can be met, and therefore the preparing method has the broad application prospects.

Description

technical field [0001] The invention belongs to the field of component detection, and in particular relates to a mercury ion nanometer sensor and its preparation method and application. Background technique [0002] Mercury is a highly toxic heavy metal widely distributed in nature, even at a low concentration level, it will cause serious harm to human health. In order to reduce the harm of mercury to the public, the U.S. Environmental Protection Agency and my country have set nM mandatory standards for mercury content in drinking water. Therefore, the detection method of mercury ions must have high sensitivity. At present, the quantitative detection techniques widely used in the world include: atomic absorption method (AAS), inductively coupled plasma atomic emission spectrometry (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), etc. Although these methods have high sensitivity and precision, they often require complex and expensive instruments, profession...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N33/18
CPCG01N21/643G01N33/1813
Inventor 龙峰王宏亮吴君
Owner RENMIN UNIVERSITY OF CHINA
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