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Preparation method of flexible organic piezoelectric-photocatalytic composite helical fibers

A photocatalytic and organic technology, applied in the field of composite helical fibers, can solve the problems of easy saturation of the built-in electric field of the catalyst, low photocatalytic efficiency, etc., and achieve the effect of good catalytic effect, promotion of effective separation, and self-repair.

Active Publication Date: 2019-02-15
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to develop a method for preparing a new piezoelectric-photocatalytic composite material system—flexible organic piezoelectric-photocatalytic composite helical fibers. Repair, continuously promote the separation of photogenerated carriers in photocatalysts, improve the catalytic performance of semiconductor photocatalysts, so as to solve the problems in the prior art that the built-in electric field of the catalyst is easy to be saturated and the photocatalytic efficiency is low

Method used

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  • Preparation method of flexible organic piezoelectric-photocatalytic composite helical fibers
  • Preparation method of flexible organic piezoelectric-photocatalytic composite helical fibers
  • Preparation method of flexible organic piezoelectric-photocatalytic composite helical fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Flexible organic piezoelectric-photocatalytic composite helical fiber PVDF / g-C 3 N 4 preparation of

[0025] S1: Add 0.2 g of pre-synthesized photocatalyst powder g-C to 9.0 g of solvent DMF 3 N 4 Ultrasonic dispersion is performed to form a photocatalyst dispersion liquid.

[0026] g-C 3 N 4 Prepared by the following steps:

[0027] S1.1 Weigh a certain amount of urea in a mortar, grind it thoroughly and transfer it to a corundum crucible;

[0028] S1.2 Put the corundum crucible into the muffle furnace for sintering, and put the reactants at 25 o C / min increased to 520 o C, keep warm for 2 hours;

[0029] S1.3 Cool the muffle furnace and the internal product to room temperature at 25°C / min to obtain a light yellow powder;

[0030] S1.4 Weigh a certain amount of light yellow powder and spread it in the corundum ark;

[0031] S1.5 Transfer the corundum ark containing the light yellow powder to the muffle furnace, sinter the powder again, and the heating rate i...

Embodiment 2

[0042] The diameter of the outlet pipe of the microfluidic device in Example 1 was set to 100 μm, and the flow rate was set to 6 mL / s. In the same manner as in Example 1, a helical fiber was prepared.

[0043]The obtained composite helical fiber has a uniform size, the helical diameter of the fiber is about 1.1 mm, the pitch is about 3.0 mm, and the diameter of the fiber is about 0.15 mm.

Embodiment 3

[0045] The diameter of the outlet pipe of the microfluidic device in Example 1 was set to 180 μm, and the flow rate was set to 30 mL / s. In the same manner as in Example 1, helical fibers were prepared.

[0046] The obtained composite helical fiber is uniform in size, the helical diameter of the fiber is 2.6 mm, the pitch is 0.78 mm, and the diameter of the fiber is about 0.35 mm.

[0047] Organic piezoelectric-photocatalytic composite helical fiber PVDF / g-C 3 N 4 Catalytic Degradation of Organic Pollutant Rhodamine B

[0048] First, the spiral micron composite fiber prepared in Example 1 is packed into a quartz capillary with a diameter of 2 mm and a length of 5 cm. The two ends of the capillary are aligned, encapsulated with a quartz glass sheet, and connected with a syringe to prepare a photocatalytic microreactor. . Each reactor contains 15 quartz capillary tubes equipped with helical fibers to ensure a certain amount of photocatalyst. Subsequently, 0.012 g of rhodamine...

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Abstract

The invention discloses a preparation method of flexible organic piezoelectric-photocatalytic composite helical fibers. The method comprises the following steps: precursor liquid of a photocatalyst, an organic piezoelectric material and a solvent is prepared; the precursor liquid is loaded into a microfluidic device and allowed to flow out from a liquid outlet pipe with a certain caliber at a certain rate; and the effluent precursor liquid is allowed to flow into a curing liquid for curing to obtain the helical fibers. The organic piezoelectric-photocatalytic composite helical fibers preparedwith the method can continuously generate self-repairing piezoelectric potentials under the action of waterflows, so that the separation of photo-generated electron-hole pairs in the photocatalyst canbe effectively promoted, and the photocatalysis efficiency can be greatly improved; and by adopting the composite helical fibers prepared with the method, the organic hazardous substance degradationefficiency of the photocatalyst can be remarkably improved, and the effects of hydrogen production through photocatalytic water splitting can be effectively enhanced.

Description

technical field [0001] The invention belongs to the fields of photocatalysis technology, piezoelectric technology and microfluidic technology, and specifically relates to the effective compounding of flexible organic piezoelectric materials and semiconductor photocatalysts, and the controllable synthesis of composite helical fibers by using microfluidic technology. Background technique [0002] Energy crisis and environmental pollution are two major problems facing mankind at present, which have aroused extensive attention of scholars all over the world. Because semiconductor photocatalysts can use solar energy to decompose water at room temperature to generate clean energy hydrogen energy, degrade harmful substances, reduce heavy metal ions, kill bacteria and eliminate odors, etc., they have broad prospects in the fields of energy and the environment, and have become the focus of today's society. One of the main research hotspots. Photocatalytic technology has achieved rap...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J27/04B01J27/24B01J35/06B01J37/34C02F1/32C01B3/04
CPCC01B3/042C02F1/32B01J27/04B01J27/24B01J31/26B01J37/343C01B2203/0277C01B2203/1041C02F2101/38C02F2101/36C02F2101/34C02F2305/10B01J35/58B01J35/39Y02E60/36
Inventor 陆春华寇佳慧代宝莹张方舒李玲许仲梓
Owner NANJING UNIV OF TECH
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