MXene-based bismuth-based photocatalytic composite membrane and preparation method thereof

A photocatalytic and composite membrane technology, which is applied in catalyst activation/preparation, chemical instruments and methods, special compound water treatment, etc. low rate issues

Active Publication Date: 2020-10-27
XIAN TECHNOLOGICAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Currently including TiO 2 , g-C 3 N 4 Various photocatalysts such as carbon quantum dots have been used in the preparation of photocatalytic films (Applied Catalysis B: Environmental 2020, 264, 118528; Journal of Membrane Science 2019, 584, 364-392; ACS Applied Materials & Interfaces 2020, 12, 580-590); but the above The ph

Method used

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  • MXene-based bismuth-based photocatalytic composite membrane and preparation method thereof
  • MXene-based bismuth-based photocatalytic composite membrane and preparation method thereof
  • MXene-based bismuth-based photocatalytic composite membrane and preparation method thereof

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preparation example Construction

[0030] The present invention also provides a method for preparing a bismuth-based photocatalytic composite film based on MXene, comprising the following steps:

[0031] Step 1: First configure the MXene aqueous dispersion with a concentration of 0.05-5 mg / mL, and then add a reducing agent, which is any one of oxalic acid, urea and sodium ascorbate;

[0032] The second step: add bismuth source and sulfur source to the MXene aqueous dispersion, stir evenly to form a mixed aqueous dispersion, wherein the bismuth source is any one of bismuth nitrate pentahydrate, bismuth chloride and bismuth subcitrate, The sulfur source is any one of carbon disulfide, thiourea, sodium sulfide and sodium thiosulfate, the concentration of the bismuth source is 0.05-6 mg / mL, and the molar ratio of the sulfur source and the bismuth source is S:Bi=0.1-5;

[0033] The third step: transfer the mixed water dispersion into the reaction kettle, grow bismuth-based photocatalytic nanoparticles on the surface...

Embodiment 1

[0039] Weigh 10mg Ti 3 C 2 T x Add 20mL of water, ultrasonically disperse evenly, configure Ti 3 C 2 T x Water dispersion, add 10mg bismuth nitrate pentahydrate (bismuth source), 5mg thiourea (sulfur source), 3mg oxalic acid (reducing agent) to Ti 3 C 2 T x In the aqueous dispersion (that is, the MXene aqueous dispersion), stir evenly for five minutes and then transfer them to a 50mL stainless steel reactor, react at 40°C for 1 hour, and cool naturally after the end; 3 C 2 T x / bismuth sulfide nanoparticle composite dispersion (i.e. MXene / bismuth-based photocatalytic nanoparticle composite dispersion) is divided into two parts, 10mL each, and one part is poured on the polyethersulfone (PES) ultrafiltration membrane substrate (porous support layer), vacuum-filtered to form a film, and placed in a vacuum oven to dry for later use. The drying time was 0.5 hour, and the drying temperature was 40°C.

[0040] The Ti prepared in this example 3 C 2 T x / Bi 2 S 3 The pho...

Embodiment 2

[0042] Weigh 10mg Ti 3 C 2 T x Add 20mL of water, ultrasonically disperse evenly, configure Ti 3 C 2 T x Water dispersion, add 35mg bismuth nitrate pentahydrate (bismuth source), 20mg thiourea (sulfur source), 15mg oxalic acid (reducing agent) to Ti 3 C 2 T x In the aqueous dispersion (that is, the MXene aqueous dispersion), stir evenly for five minutes and transfer them to a 50mL stainless steel reactor, react at 120°C for 12 hours, and cool naturally after the end; 3 C 2 T x / bismuth sulfide nanoparticle composite dispersion (i.e. MXene / bismuth-based photocatalytic nanoparticle composite dispersion) is divided into two parts, 10mL each, and one part is poured on the polyethersulfone (PES) ultrafiltration membrane substrate (porous support layer), vacuum-filtered to form a film, and placed in a vacuum oven to dry for later use. The drying time was 1 hour and the drying temperature was 60°C.

[0043] By scanning electron microscope (SEM), X-ray diffraction analysis (...

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Abstract

The invention belongs to the technical field of membrane preparation, and particularly provides a MXene-based bismuth-based photocatalytic composite membrane which comprises an MXene nanosheet, bismuth-based photocatalytic nanoparticles and a porous support layer, wherein the bismuth-based photocatalytic nanoparticles grow on a single-layer MXene nanosheet in situ to form an MXene/bismuth-based photocatalytic nanoparticle composite material, and the MXene/bismuth-based photocatalytic nanoparticle composite material is prepared on the porous support layer; the membrane has good separation performance, and the pure water flux is increased by 2-23 times compared with that of a traditional polymer membrane on the premise that the rejection rate is kept; the membrane has excellent self-cleaningand anti-pollution performance, after the membrane performs a filtering experiment on dye molecules rhodamine B for 12 hours, the dye adsorbed on the membrane is degraded for 20 minutes by using simulated sunlight, and the water flux recovery rate of the membrane is as high as 97.6%; the preparation method of the MXene-based bismuth-based photocatalytic composite membrane is relatively simple, low in cost, time-saving and suitable for industrial expanded production.

Description

technical field [0001] The invention belongs to the technical field of membrane materials and membrane preparation, and in particular relates to an MXene-based bismuth-based photocatalytic composite membrane and a preparation method thereof. Background technique [0002] With the development of industrialization, more and more industrial waste water leads to increasingly serious environmental pollution. In the toxic waste water of the textile and dye industry, one of the important sources of pollution, organic small molecules have a stable structure, high content, deep color, and are not easy to be degraded. Relying on the advantages of low energy consumption, high efficiency, and environmental friendliness, membrane separation technology plays an important role in the treatment of printing and dyeing wastewater. [0003] to Ti 3 C 2 T x The representative MXene is a two-dimensional layered transition metal carbide / nitride, with its layered ultra-thin and rigid structure...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J27/22B01J37/10B01D69/02B01D67/00C02F1/30C02F1/44C02F101/30
CPCB01J27/24B01J27/22B01J35/023B01J35/004B01J37/10B01D69/02B01D67/0088C02F1/30C02F1/44B01D2325/10C02F2101/308C02F2305/10Y02W10/37
Inventor 张红梨张娜陈卫星杨杰罗春燕
Owner XIAN TECHNOLOGICAL UNIV
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