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Preparation method and application of bifunctional photoelectrochemical composite membrane

A photoelectrochemical, composite membrane technology, applied in chemical instruments and methods, special compound water treatment, membranes, etc., can solve problems such as reducing reaction kinetics, and achieve the effects of simple raw materials, easy availability of raw materials, and short preparation period.

Active Publication Date: 2020-01-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And once the adsorbent and the adsorbate have the same charge polarity, the electrostatic repulsion will further reduce the reaction kinetics.

Method used

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  • Preparation method and application of bifunctional photoelectrochemical composite membrane
  • Preparation method and application of bifunctional photoelectrochemical composite membrane
  • Preparation method and application of bifunctional photoelectrochemical composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation method of MIL-88B(Fe)@O-CNT composite:

[0042] (1) Take 15 mg of multi-walled CNTs and immerse them in nitric acid (37wt%) at 70°C for 12h, vacuum filter them into blocks, wash off excess acid with ultrapure water, and dry at 70°C to obtain O-CNT;

[0043] (2) Dissolve O-CNT in 25mL N,N-dimethylformamide, use an ultrasonic cell disruptor to make it evenly dispersed, the ultrasonic power is 50-200W, the ultrasonic time is 20-60min;

[0044] (3) Add 0.225mmol FeCl 3 ·6H 2 O was added to the above O-CNT dispersion and stirred overnight;

[0045] (4) Add 0.225mmol terephthalic acid to 8mL N,N-dimethylformamide solution and stir evenly, then drip into the mixed solution in (3) at a flow rate of 16mL / h, and then stir for 40min to mix evenly;

[0046] (5) Transfer the mixed solution in (4) to a 50mL PTFE-lined hydrothermal kettle, and put it in a blast drying oven. The heating temperature is 100~200℃, and the heating time is 2~6h. Make MIL-88B (Fe) grow uniformly in situ o...

Embodiment 2

[0056] A continuous flow photoelectric catalytic system to remove antimony (III) method:

[0057] (1) Vacuum filter the CM (50:3) mixed solution prepared in Example 1 onto the PTFE supporting membrane, and then wash with ethanol and ultrapure water in sequence to obtain a CM (50:3) composite membrane;

[0058] The pore size of the above composite membrane is in the range of 3-8nm, showing a mesoporous pore size distribution, such as image 3 Shown.

[0059] (2) such as Figure 4 As shown, the CM (50:3) composite membrane 3 is used as the photoanode and the porous titanium sheet 5 is used as the cathode to be placed in a double-layer membrane filter device. The plastic gasket 4 is placed between the composite membrane and the porous titanium sheet 5 to make the composite membrane and The titanium ring 2 applied with a positive potential is in close contact. Under illumination 1 and applied potential 2, using continuous flow filtration, 1000μg / L of antimony (III) wastewater was flowed...

Embodiment 3

[0076] The CM synthesized in Example 2 (50:3) has the highest antimony (III) and antimony total Removal rate, this case mainly tests the stability of CM (50:3) composite membrane.

[0077] (1) Using continuous flow filtration, the wastewater containing antimony (III) was passed through the CM (50:3) composite membrane prepared in Example 2 through a peristaltic pump at a flow rate of 0.5 mL / min (the reaction conditions were set to antimony ( III) Solution concentration 500μg / L, pH=5.5, applied potential 1.5V, visible light irradiation), to the antimony in the aqueous solution total Never change

[0078] (2) The above-mentioned CM (50:3) composite membrane saturated with antimony adsorption was filtered through a circulating flow, washed with 5mM HCl solution (200mL) at a flow rate of 1mL / min to desorb the antimony ions, and then deionized Wash with water at a flow rate of 1mL / min to pH=7, then freeze-dry in vacuum;

[0079] (3) Steps (1) and (2) are repeated twice, and the stabi...

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Abstract

The invention discloses a preparation method of a bifunctional photoelectrochemical composite membrane and application of the bifunctional photoelectrochemical composite membrane in treatment of antimony (III) in a continuous flow photoelectrocatalysis system. The preparation method comprises the following steps: adding acidified CNT into an N,N-dimethylformamide solution, and then adding FeCl<3>.6H2O; dissolving terephthalic acid into an N,N-dimethylformamide solution, then adding the obtained terephthalic acid solution into the mixed solution, and heating for reaction; and carrying out suction filtration to a support membrane to obtain the bifunctional photoelectrochemical composite membrane. The composite membrane material has response to an electric field and light at the same time. Separation and transfer of electron-hole pairs generated in the photocatalysis process are accelerated by means of an external electric field, and more holes and .OH are promoted to participate in the antimony (III) oxidation process; besides, the Fe-O cluster in the membrane component has strong affinity to antimony ions, so that efficient oxidation and removal of antimony (III) are synchronously realized under the synergistic effect of an external electric field and continuous flow enhanced mass transfer.

Description

Technical field [0001] The invention relates to a preparation method and application of a dual-function photoelectrochemical composite film, in particular to a preparation method of a metal organic framework and carbon nanotube composite film material (MIL-88B(Fe)@O-CNT) and its application to water The oxidation and adsorption of the medium to high toxicity heavy metal trivalent antimony belongs to the technical field of water treatment. Background technique [0002] In recent years, a series of water environmental pollution and ecological safety problems caused by the excessive standards of emerging pollutants antimony (Sb, heavy metals, and arsenic) have attracted great attention from scholars at home and abroad. In the natural water environment, antimony occurs mainly in inorganic trivalent antimony (antimony (III)) and pentavalent antimony (antimony (V)). Among them, antimony (III) is 10 times more toxic than antimony (V) (Environ.Sci.Technol.,2016,50,6974-6982). Studies h...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D69/02B01D71/36C02F1/30C02F1/28C02F1/72C02F101/20
CPCB01D67/0079B01D69/02B01D69/12B01D71/021B01D71/06B01D71/36B01D2325/10B01D2325/12C02F1/288C02F1/30C02F1/725C02F2101/20C02F2305/10
Inventor 刘艳彪李墨华沈忱思李方杨波马春燕刘富强郭东丽胡雪梅任伊凡
Owner DONGHUA UNIV
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