An attapulgite-graphite-like-phased carbon nitride-poly(vinylidene fluoride) nanometer composite ultrafiltration membrane, a preparing method thereof and applications of the membrane

A technology of graphite phase carbon nitride and polyvinylidene fluoride membrane, which is applied in chemical instruments and methods, ultrafiltration, special compound water treatment, etc., can solve the problems of section, bottom surface structure and performance without improvement, and improve anti-pollution And self-cleaning performance, the effect of improving economy

Active Publication Date: 2017-06-30
HUAIYIN TEACHERS COLLEGE
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the blending modification, since the nanoparticles are wrapped in the polymer membrane material, its photocatalytic performance is seriously affected. The modification can expose the nanoparticles on the surface of the membrane and directly interact with the pollutants, but the implantation of nanoparticles only changes the surface morphology of the ultrafiltration membrane, and does not improve the structure and performance of its cross section and bottom surface.

Method used

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  • An attapulgite-graphite-like-phased carbon nitride-poly(vinylidene fluoride) nanometer composite ultrafiltration membrane, a preparing method thereof and applications of the membrane
  • An attapulgite-graphite-like-phased carbon nitride-poly(vinylidene fluoride) nanometer composite ultrafiltration membrane, a preparing method thereof and applications of the membrane

Examples

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preparation example Construction

[0046] The preparation method of the ultrafiltration membrane can be obtained by common phase inversion methods, such as immersion precipitation phase inversion and thermally induced phase inversion coupling process, firstly, attapulgite-graphite-like carbon nitride composite material, PVDF, organic solvent After mixing and dispersing, a casting liquid is obtained, and after the casting liquid undergoes phase transformation in the solidification liquid, an ultrafiltration membrane with a microporous structure can be obtained.

[0047] Here, the organic solvent refers to a substance that dissolves polyvinylidene fluoride resin, and examples thereof include N-methyl-2-pyrrolidone, tetrahydrofuran, dimethyl sulfoxide, tetramethyl urea; Amides such as methylformamide; esters or lactones such as trimethyl phosphate, triethyl phosphate, γ-butyrolactone; and their mixed solvents.

[0048] In the above-mentioned method, the non-solvent of the coagulation liquid includes, for example, ...

Embodiment 1

[0055] Example 1 Preparation of attapulgite-graphite-like carbon nitride composite material

[0056] Weigh 3.02g of silane coupling agent-modified attapulgite and disperse it in 1000mL of deionized water, and ultrasonically disperse; then add 6.01g of melamine, stir, condense and reflux at 80°C for 2h; then freeze-dry for 48h, grind and add to a quartz boat , place the quartz boat in a tube furnace, and program the temperature in the tube furnace under an air atmosphere. The heating program is as follows: the room temperature is increased to 500 °C for 0.5 h, kept at 500 °C for 2 h, and then heated to 520 °C for 2 min. After 2 hours, the temperature was naturally lowered, and the material was fully ground to powder to obtain attapulgite-graphite-like carbon nitride composite material (for the preparation method, refer to patent document CN106179447A).

Embodiment 2

[0057] Example 2 Preparation of attapulgite-graphite-like carbon nitride composite material doped ultrafiltration membrane

[0058] 1 gram of attapulgite-graphite-like carbon nitride composite material was added to 80 grams of triethyl phosphate, after vigorous mechanical stirring and ultrasonic treatment, 20 grams of polyvinylidene fluoride powder was added and stirred at 80 °C Dissolve for 24 hours, then add 5 grams of polyethylene glycol and stir for 12 hours to obtain a casting solution, which is then left to stand for deaeration at 80°C for 24 hours. The coupling process of immersion precipitation phase inversion and thermally induced phase inversion is adopted. The conditions are: air drying process is 0 cm; the flow rate of the casting liquid is 2 mL / min; the core liquid is an aqueous suspension of attapulgite-graphite-like carbon nitride composite material, and the mass percentage of attapulgite-graphite-like carbon nitride composite material in the inner core liquid i...

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Abstract

The invention discloses an attapulgite-graphite-like-phased carbon nitride-poly(vinylidene fluoride) nanometer composite ultrafiltration membrane and a preparing method thereof. Through simultaneously introducing an attapulgite-graphite-like-phased carbon nitride composite material into the main body, the external surface and the internal surface of a poly(vinylidene fluoride) hollow fiber ultrafiltration membrane, a three-dimensional network structure formed by a unique nanometer fiber structure of attapulgite and poly(vinylidene fluoride) can be utilized to effectively improve the structure and strength of the poly(vinylidene fluoride) ultrafiltration membrane and to enhance a membrane densification property; high hydrophilicity of the attapulgite is utilized to improve permeability and hydrophilicity of the membrane; and more importantly, photocatalytic performance of graphite-like-phased carbon nitride on the internal and external surfaces and in the main body of the ultrafiltration membrane is utilized to achieve anti-pollution and self-cleaning functions of the membrane and to increase the economical efficiency of a membrane separating process.

Description

technical field [0001] The invention relates to an attapulgite-graphite-like carbon nitride-polyvinylidene fluoride nanocomposite ultrafiltration membrane and a preparation method thereof, belonging to the technical field of membrane separation materials. Background technique [0002] Membrane separation technology, as an efficient and pollution-free purification technology integrating concentration and separation, has the characteristics of simple operation, convenient maintenance, low energy consumption and strong adaptability, and has been widely used in chemical industry, electronics, food, medical treatment and environmental protection and other fields. The chemical properties and membrane structure of the membrane material determine the separation effect. Polyvinylidene fluoride (PVDF) is an emerging membrane material with excellent comprehensive performance. It has high mechanical strength, acid and alkali resistance and other harsh environmental conditions and good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D69/12B01D71/34B01J31/06C02F1/30C02F1/44C02F101/30
CPCB01D61/145B01D67/0079B01D69/02B01D69/12B01D71/34B01D2325/10B01J31/06B01J35/004B01J35/023B01J35/065C02F1/30C02F1/444C02F2101/30C02F2305/10
Inventor 周守勇薛爱莲赵宜江赵丹李梅生杨禹张艳邢卫红吴飞跃张莉莉褚效中黄进
Owner HUAIYIN TEACHERS COLLEGE
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