Biomimetic construction method of g-C3N4/BiOI-pDA@PVDF photocatalytic membrane and application thereof

A technology of photocatalytic film and construction method, which is applied in the field of environmental functional material preparation, can solve the problems of reduced catalytic active sites of catalysts, uneven distribution of nano-photocatalysts, and reduced photocatalytic activity, so as to reduce film pollution and improve photocatalytic activity. Catalytic activity, the effect of improving catalytic activity

Inactive Publication Date: 2019-08-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the uneven distribution of nano-photocatalysts in the photocatalytic film prepared by the traditional blending modification method, and a large number of photocatalysts embedded in the film matrix, the catalytic active sites of the catalysts may be reduced and the photocatalytic efficiency will be reduced.
In addition, the photocatalyst embedded in the membrane may block the membrane channel and reduce the flux of the membrane
Inorganic catalysts have poor interfacial compatibility with organic polymers, such as cellulose acetate (CA), which lacks active functional groups, resulting in reduced photocatalytic activity of the film and secondary pollution

Method used

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  • Biomimetic construction method of g-C3N4/BiOI-pDA@PVDF photocatalytic membrane and application thereof
  • Biomimetic construction method of g-C3N4/BiOI-pDA@PVDF photocatalytic membrane and application thereof
  • Biomimetic construction method of g-C3N4/BiOI-pDA@PVDF photocatalytic membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1g-C 3 N 4 / Preparation of BiOI-pDA@PVDF photocatalytic film

[0033] (1) Weigh a certain amount of melamine in a semi-closed crucible, dry it overnight, then wrap it with tin foil and transfer it to a temperature-programmed muffle furnace, and heat it to 550°C for 4.0h at a heating rate of 2.3°C / min. , after naturally cooling to room temperature, take it out, grind it into powder, and get g-C 3 N 4 ;

[0034] (2) Take a certain quality of Bismuth Nitrate Pentahydrate Bi(NO 3 ) 3 ·5H 2 O and g-C 3 N 4 Disperse in absolute ethanol, ultrasonic for 30min; then dissolve a certain mass of KI in deionized water, add dropwise to the above mixed solution under vigorous stirring, after stirring for 1h, transfer the obtained solution to an autoclave at 180°C for hydrothermal After reacting for 12 hours, the obtained product was centrifuged, washed, and dried to obtain a composite photocatalyst, denoted as g-C 3 N 4 / BiOI;

[0035] (3) Preparation of pDA@PVDF ...

Embodiment 2

[0043] Under the condition that embodiment 2 guarantees that other conditions are constant, set up comparative experiment as follows: in step (4), take 0.2gBiOI catalyst to replace g-C 3 N 4 / BiOI, added to the casting solution.

Embodiment 3

[0044] Under the situation that embodiment 3 guarantees that other conditions are constant, set up comparative experiment as follows: in step (4), take by weighing 0.2gg-C 3 N 4 The catalyst was replaced by g-C3N4 / BiOI and added to the casting solution.

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Abstract

The invention belongs to the technical field of preparation of environmental functional materials, and discloses a biomimetic construction method of a g-C3N4 / BiOI-pDA@PVDF photocatalytic membrane andapplication thereof. According to the biomimetic construction method, the photocatalytic membrane is prepared by using a freeze casting method after modifying PVDF powder with polydopamine (pDA), andthe photocatalytic membrane is used for removing tetracycline (TC) from a solution. Researches show that the modified PVDF powder can effectively solve the problem of compatibility between a photocatalyst and a membrane, the catalytic performance of the g-C3N4 / BiOI-pDA@PVDF photocatalytic membrane is further improved; according to the freeze casting method, an ordered lattice macroporous structureis formed inside the membrane, so that the flux of the membrane is increased, more catalytic active sites are provided and the catalytic activity is effectively improved; in addition, a composite membrane with a photocatalytic function is prepared through combination of a photocatalytic technology and a membrane separation technology, membrane fouling is effectively reduced, recycling of the composite membrane is facilitated, and the composite membrane is superior to a powder catalyst and has practical application.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, in particular to a g-C 3 N 4 / Biomimetic construction method and application of BiOI-pDA@PVDF photocatalytic membrane. Background technique [0002] Tetracycline (Tetracycline, TC) is a class of chemical substances that can inhibit the reproduction of bacteria and microorganisms, and is widely used in the treatment of various bacterial infectious diseases in humans and animals, such as: mycoplasma pneumonia, Gram-positive and negative bacterial infections, etc. However, with the large-scale use of TC, it is continuously discharged and accumulated in the water environment through various channels. Although it has certain antibacterial activity against some bacterial microorganisms, it can also induce some drug-resistant bacteria, leading to the spread of drug-resistant microorganisms. problems, thereby threatening human health and the balance of ecosyste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J35/02B01J35/10C02F1/30C02F101/38C02F101/34
CPCB01J31/26B01J35/004B01J35/02B01J35/10C02F1/30C02F2101/34C02F2101/38C02F2305/10
Inventor 郑健吴瑾瑜兰义营崔颜华李彬榕孟敏佳
Owner JIANGSU UNIV
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