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Attapulgite-graphite-like carbonitride composite hollow fiber microfiltration membrane with photocatalytic performance and preparation method and application thereof

A graphite phase carbon nitride and attapulgite technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of low recycling rate, difficult separation, and difficult dispersion, etc., to maintain process characteristics and treatment. ability, improve the photocatalytic degradation rate, and ensure the effect of complete removal

Active Publication Date: 2017-07-14
HUAIYIN TEACHERS COLLEGE
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  • Description
  • Claims
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Problems solved by technology

CN106179447A discloses a strong coupling type attapulgite-KHX-g-C 3 N 4 Preparation method of composite material, strongly coupled attapulgite-KHX-g-C 3 N 4 Composite materials have good catalytic properties, but they still face the disadvantages of easy agglomeration during preparation, difficulty in dispersing and separation during use, low reuse rate, and secondary pollution easily caused by the effluent, which seriously limits its application.

Method used

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  • Attapulgite-graphite-like carbonitride composite hollow fiber microfiltration membrane with photocatalytic performance and preparation method and application thereof

Examples

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preparation example Construction

[0053] The preparation method adopts the phase inversion method combined with the roasting technology to prepare the hollow fiber ceramic membrane. The specific steps include: 1) Add attapulgite-graphite-like phase carbon nitride composite material particles and ceramic matrix particles into the solvent, and stir them evenly after ultrasonication. Add polyethersulfone, ball mill evenly, add porogen, stir evenly at room temperature, and vacuum degas to obtain casting solution; 2) Phase inversion process, that is, casting solution passes through spinning device, casting solution and core solution, Formed under the action of flocculant, and soaked in the external flocculant for a certain period of time to complete the phase transformation of solvent / non-solvent. 3) In the process of drying and sintering, the film with complete phase inversion is taken out from the external coagulation bath and dried naturally; the dried film is fired at a certain temperature to make it have corres...

Embodiment 1

[0059] Example 1 Preparation of attapulgite-graphite-like phase carbon nitride composite material

[0060] Weigh 3.02g of silane coupling agent-modified attapulgite and disperse it in 1000mL of deionized water, 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 the quartz boat , the quartz boat was placed in the tube furnace, and the temperature was programmed in the tube furnace under the air atmosphere. The temperature rise program was as follows: room temperature was raised to 500 °C for 0.5 h, kept at 500 °C for 2 h, then continued to be heated to 520 °C for 2 min, and kept After 2 hours, the temperature was naturally lowered, and it was fully ground to a powder form to obtain an attapulgite-graphite-like phase carbon nitride composite material (for the preparation method, refer to patent document CN106179447A).

Embodiment 2

[0062] Preparation of attapulgite-graphite-like phase carbon nitride composite hollow fiber microfiltration membrane: Add 170 g of 1-methyl-2-pyrrolidone and 22 g of nano-alumina particles, attapulgite-graphite-like phase to a 500ml reagent bottle in sequence 28g of carbon nitride composite material, stirred evenly after 10 minutes of ultrasonication, added 25g of polyethersulfone, ball milled for 72 hours, then added 5 g of polymethylpyrrolidone K23-27, continued stirring for 6 hours, and vacuum degassed for 4 hours to obtain a stable casting Membrane fluid.

[0063]Add the casting solution and the core solution deionized water into the stainless steel syringe of the high-pressure syringe pump, turn on the injection pump, let the core solution deionized water and the casting solution pass through the spinning head, and the casting solution is at the exit of the spinning head The spinning process parameters are: the air gap is 15 cm respectively, and the core liquid flow rate ...

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Abstract

The invention relates to an attapulgite-graphite-like carbonitride composite hollow fiber microfiltration membrane with photocatalytic performance and a preparation method and application thereof. The preparation method comprises the following steps: adding attapulgite-graphite-like carbonitride composite particles into a solvent to prepare a polyethersulfone casting solution, extruding the casting solution through a spinning nozzle, passing through a section of air gap and entering coagulation bath for curing molding, and sintering to obtain the attapulgite-graphite-like carbonitride composite hollow fiber microfiltration membrane with photocatalytic performance. The hollow fiber microfiltration membrane is composed of fibrous attapulgite and a graphite-like carbonitride polymer with photocatalytic performance. By the photocatalytic performance of the graphite-like carbonitride, coupling of photocatalysis and membrane separation process can be realized. As the graphite-like carbonitride polymer is uniformly dispersed and immobilized on the attapulgite surface of the membrane through the chemical binding effect, the deficiency that granular graphite-like carbonitride is easy to agglomerate, hard to separate and difficult to reuse during the separate using process is effectively avoided.

Description

technical field [0001] The invention relates to an attapulgite-graphite-like phase carbon nitride composite hollow fiber microfiltration membrane with photocatalytic performance and a preparation method thereof, belonging to the technical field of ceramic membrane preparation. Background technique [0002] Hollow fiber ceramic membrane not only has excellent thermal stability, chemical stability and durability of ceramic materials, it is suitable for separation systems under harsh environments such as strong acid, strong alkali and high temperature, and has a large specific surface area and high packing density per unit volume. Today, when the cost is high, it can greatly save the operating cost and has important practical application value. At present, the main hollow fiber ceramic microfiltration membranes are mainly composed of Al 2 o 3 、TiO 2 , ZrO 2 It is made of ceramic particles, and the cortical pores that act as separation are formed by the accumulation of cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/08B01D69/02B01D67/00B01D61/14C02F1/30C02F1/44C02F101/30
Inventor 张艳薛爱莲周守勇赵宜江范兆如李梅生邢卫红吴飞跃张莉莉褚效中黄进
Owner HUAIYIN TEACHERS COLLEGE
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