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Filter membrane preparation method and filter membrane

A filter membrane and nanofiltration membrane technology, applied in the field of chemical materials, can solve the problems of inability to effectively absorb photons in the visible light region, limit practical applications, and high economic costs, achieve effective separation efficiency of photogenerated charge carriers, and facilitate recycling and reuse , avoid the effect of rapid compounding

Active Publication Date: 2020-03-24
ZHUHAI DAHENGQIN TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SnO 2 The band gap is wide (3.59eV), and it can only absorb ultraviolet light, while the ultraviolet photon flux only accounts for 3% of the entire solar spectrum
However, the use of artificial ultraviolet light in the photocatalytic process will consume a large amount of additional energy, and the economic cost is high.
In addition, injecting SnO 2 The electrons in the conduction band (Conduction Band, CB) are easy to recombine with the holes in the valence band (Valence Band, VB) to reduce the photocatalytic efficiency.
[0004] It can be seen that there are four typical disadvantages in traditional photocatalytic systems: 1) rapid recombination of photoinduced charges; 2) metal oxides with too wide a band gap to effectively absorb photons in the visible light region; 3) materials are difficult to recycle; in addition, 4) nanoparticles Severe agglomeration reduces the surface area and inhibits the catalytic activity of photocatalysts, which limits its practical application

Method used

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  • Filter membrane preparation method and filter membrane
  • Filter membrane preparation method and filter membrane
  • Filter membrane preparation method and filter membrane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] refer to figure 1 , showing a flow chart of the steps of a method for preparing a filter membrane provided by the present invention, such as figure 1 As shown, the method may include:

[0043] Step 101: Prepare SnO with a three-dimensional network structure 2 nanofiltration membrane.

[0044] In the embodiment of the present invention, based on SnO 2 High electron mobility, photocatalytic activity, chemical stability, non-toxicity and low cost, choose SnO 2 Nanofiltration membranes serve as the basis for membrane preparation. Optionally, in order to enhance the SnO 2The specific surface area of ​​the nanofiltration membrane can prepare SnO with a three-dimensional network structure 2 nanofiltration membrane. Those skilled in the art can also select other nanofiltration membranes with a high specific surface area structure, high electron mobility, and good photocatalytic activity according to specific preparation process conditions or actual application requiremen...

example 1

[0086] Deposition of dense polycrystalline SnO on pre-cleaned stainless steel wire mesh cartridges by spray pyrolysis on a hot stage at 300 °C 2 electron transport layer. Spray precursor solution containing 0.25M SnCl 2 ethanol solution. The spray distance is 6 cm from the sample, the single spray time is 60 seconds, the number of spray cycles is 30, and the interval between each cycle is 30 seconds. By controlling the above parameters, the dense polycrystalline SnO with a thickness of about 100 nanometers is obtained. 2 Electron transport layer;

[0087] The viscous paste of SnO 2 Nanoparticles (average particle size 50 nm, diluted with 36% terpineol into a viscous paste) were loaded onto dense polycrystalline SnO by stencil printing. 2 On the electron transport layer, cycle this operation 3 times, and dry in an oven at 150°C for 15 minutes after each cycle, then place the sample in a muffle furnace for sintering at 380°C for 30 minutes, and then naturally cool to 70°C ,...

example 2

[0093] The embodiment of the present invention is also to the ZD12-SnO that above-mentioned example 1 prepares 2 The catalytic degradation performance of volatile organic compounds, such as benzene, toluene, and formaldehyde, has been studied in the photocatalytic system of nanofiltration membranes. The following takes formaldehyde as an example:

[0094] Add 100L of formaldehyde-containing air to the quartz reactor to circulate through the filter membrane, the initial formaldehyde concentration is 0.1-12mg / L, the initial humidity is 10-260%, and the formaldehyde air flow rate is 10-260m 3 / h. The adsorption experiment was carried out in the dark for 15 minutes to achieve sufficient contact between formaldehyde and photocatalyst to establish adsorption equilibrium.

[0095] Alternatively, 100L of formaldehyde-containing air can be added to the quartz reactor to circulate through the filter membrane, the initial formaldehyde concentration is 10mg / L, the initial humidity is 72%...

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Abstract

The embodiment of the invention provides a filter membrane preparation method. The preparation method includes: preparing a SnO2 nano filter membrane with a three-dimensional network structure; immersing the SnO2 nano filter membrane into an ethanol solution containing 0.35mmol / L ZD12 molecules, and conducting sensitizing for 6h to obtain a ZD12-SnO2 nano filter membrane; and bonding the ZD12 molecules to the surface of the SnO2 nano filter membrane through a cyanoacetic acid group chemical bond. Specifically, the structure of the ZD12 molecules is shown as the specification. The filter membrane prepared according to the embodiment of the invention has a simple preparation method, can effectively absorb light, has high photocatalytic efficiency and good stability, and is convenient for recycling.

Description

technical field [0001] The invention relates to the field of chemical materials and the field of pollutant treatment, in particular to a method for preparing a filter membrane and a filter membrane. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point below 260°C at normal pressure, or all volatile compounds with a vapor pressure greater than or equal to 10Pa at 20°C Organic compounds, most VOCs have unpleasant special smell, and are toxic, irritating, teratogenic and carcinogenic, especially benzene, toluene and formaldehyde will cause great harm to human health. For example, formaldehyde is a typical representative of VOCs, which widely remains in chemical products such as paints and coatings. At present, it is reported that formaldehyde is leached from decoration building materials, furniture, and plastic products, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/06B01J31/02B01D53/86B01D53/72
CPCB01D67/0079B01D69/02B01D71/06B01D53/8668B01J31/0271B01J31/0248B01D2255/2094B01D2255/802B01D2257/7027B01D2257/708B01J35/39
Inventor 钟丹
Owner ZHUHAI DAHENGQIN TECH DEV CO LTD
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