Formaldehyde gas sensor, making method and formaldehyde monitoring and treatment device

A technology of formaldehyde gas and production methods, applied in the direction of material electrochemical variables, etc., can solve the problems of harming human health and toxicity, and achieve low cost, simple operation, and easy realization

Inactive Publication Date: 2012-03-21
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Formaldehyde, also known as formalin, is a colorless gas with a strong pungent odor. Its chemical formula is CH 2 O, because of its special chemical activity, high purity, and cheap price, it is widely used in production and interior decoration, but it is also a toxic substance that endangers human health

Method used

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  • Formaldehyde gas sensor, making method and formaldehyde monitoring and treatment device
  • Formaldehyde gas sensor, making method and formaldehyde monitoring and treatment device
  • Formaldehyde gas sensor, making method and formaldehyde monitoring and treatment device

Examples

Experimental program
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example 1

[0028] Such as figure 1 As shown, the working electrode 2 of the formaldehyde gas sensor 1 is a Pd-Ni / SiNWs formaldehyde catalytic electrode, which is installed in the middle of the sensor housing 4, and the counter electrode 3 is a Ni / SiNWs formaldehyde gas sensor electrode, which is installed in the sensor housing. At the inner bottom of the housing 4, the working electrode 2 and the counter electrode 3 are respectively connected to the corresponding tube angle 5 at the bottom of the sensor housing 4 through wires. The electrolyte 6 is filled between the working electrode 2 and the counter electrode 3, and the shell above the working electrode 2 The inner space is connected with the vent hole 9 on the top of the sensor housing 4 through the vent membrane 7 and the filter 8 . The electrolyte 6 has a concentration of 2 M L -1 of KOH solution. figure 2 SEM image of Ni / SiNWs array cathode, image 3 It is the SEM image of the Pd-Ni / SiNWs array anode.

example 2

[0029] Example 2 Manufacturing method of formaldehyde gas sensor electrode

[0030] 1) The preparation method of Ni / SiNWs formaldehyde gas sensor cathode is as follows: the surface area is about 1.0×0.5cm 2The SINWs sheet is a prefabricated electrode substrate, cleaned with deionized water, soaked in 1-5% TritonX-100 wetting agent for 30-60s to activate the surface, so that the surface of SiNWs can form a H-bond terminated surface.

[0031] Prepare the following chemical electrode array electroless plating solution: 1mol L -1 Nickel sulfate hexahydrate, 0.5 mol L -1 Ammonium sulfate, 0.005~0.010mol L -1 Lead chloride, 2.5mol L -1 Ammonium fluoride, 0.001mol L -1 Sodium lauryl sulfate, 0.2mol L -1 Sodium succinate, 0.2mol L -1 Sodium citrate. Mix the above plating solution and put it into 100 mL deionized water for ultrasonic dissolution for 20 min, then put it into a constant temperature water bath with a temperature control accuracy of 0.1°C and raise the temperature t...

example 3

[0034] Example 3 Formaldehyde monitoring and real-time processing device made of formaldehyde gas sensor

[0035] Such as Figure 4 As shown, the device is composed of a formaldehyde sensor 1 extended and connected in sequence, a single-chip microcomputer 10 whose model is STC12C5410, a peak current value holder 11 whose model is PKD01, and a display output device 12 whose model is LCD1602.

[0036] The device system is usually in a dormant state. When there is no formaldehyde gas molecule in the indoor air, no voltage will be generated on the electrode; if there is formaldehyde gas in the air, the formaldehyde molecule will catalyze oxidation on the Pd-Ni / SiNWs electrode and release charges, resulting in A catalytic voltage of about -0.7 V is generated on the electrode, which can wake up the STC12C5410 to work by interrupting, and then output a cyclic voltammetry scanning voltage on the triangular wave output circuit according to the program, which can promote the electrocata...

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Abstract

The invention discloses a formaldehyde gas sensor and a making method thereof and a formaldehyde monitoring and treatment device with the formaldehyde gas sensor. The formaldehyde gas sensor is an electrochemical two-electrode system, a Pd-Ni / SiNWs formaldehyde catalytic electrode is used as a working electrode, a Ni / SiNWs electrode is used as a counter electrode, and the formaldehyde gas sensor is made by electrolyte encapsulation. Each SiNWs of the Pd-Ni / SiNWs electrode in the designed formaldehyde gas sensor can be regarded as a micro electrode with a micro / nano-scale curvature radius tip,so that catalytic reaction of formaldehyde gas molecules on the surface of the Pd-Ni / SiNWs electrode is promoted. The clearances among numerous SiNWs also have micro or nano scale, so that the effective diffusion layer soaked into a solution is smaller, and meanwhile, the double-electrode layer of the solution / electrode interface has stronger electric field effect. The formaldehyde monitoring and treatment device can be used for monitoring the formaldehyde concentration in the indoor air and treating the formaldehyde in real time, and has the advantages of low cost, simplicity in operation, easiness in implementation and the like.

Description

technical field [0001] The invention relates to a formaldehyde gas sensor and a manufacturing method of the formaldehyde gas sensor, and also relates to a formaldehyde monitoring and processing device made of the formaldehyde gas sensor. technical background [0002] Formaldehyde, also known as formalin, is a colorless gas with a strong pungent odor. Its chemical formula is CH 2 O, because of its special chemical activity, high purity, and low price, is widely used in production and interior decoration, but it is also a toxic substance that endangers human health. Therefore, the detection and treatment of indoor formaldehyde is of great significance. On the one hand, formaldehyde is a highly toxic substance, and formaldehyde ranks second on the list of priority control of toxic chemicals in my country. Formaldehyde is defined as carcinogenic and teratogenic shape material by the World Health Organization, is the allergen of generally acknowledging, also is one of potential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/26
Inventor 苗凤娟陶佰睿宋志章张琦戴问樵彭立志丛秀亮陈清清刘晓佳
Owner QIQIHAR UNIVERSITY
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