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Biomass cellulose modified PVDF hollow fiber microfiltration membrane as well as preparation method and application thereof

A biomass and cellulose technology, used in chemical instruments and methods, biological water/sewage treatment, membranes, etc., can solve the problems of easy detachment of carbon nanotube modified layers, and achieve good anti-pollution performance and anti-mechanical fracture performance. , The effect of low processing cost and simple processing method

Pending Publication Date: 2020-09-04
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this simple coating method surface carbon nanotube modified layer is easy to fall off

Method used

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  • Biomass cellulose modified PVDF hollow fiber microfiltration membrane as well as preparation method and application thereof
  • Biomass cellulose modified PVDF hollow fiber microfiltration membrane as well as preparation method and application thereof
  • Biomass cellulose modified PVDF hollow fiber microfiltration membrane as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of biomass cellulose modified PVDF hollow fiber microfiltration membrane, comprising the following steps:

[0035] (1) The biomass is made of tea dregs. After the tea dregs are crushed and washed with water, they are added to the acidic sodium chlorite solution for immersion treatment. The pH of the acidic sodium chlorite solution is adjusted to 3 with nitric acid, and the temperature of immersion is 100°C. 30min; after the impregnation, wash it with 95% ethanol solution to obtain biomass crude cellulose; take the above biomass crude cellulose and place it in a sodium hydroxide solution with a mass concentration of 2% and heat it to 100°C for alkali treatment After 30 minutes, the hemicellulose was removed to obtain biomass cellulose, which was dried and used for later use.

[0036] (2) Add biomass cellulose to DMAC, and add LiCl, the dosage of LiCl is 60g / L; ultrasonic 6h under the condition of ultrasonic power 100W at 80°C to fully disperse the bi...

Embodiment 2

[0050] A preparation method of biomass cellulose modified PVDF hollow fiber microfiltration membrane, comprising the following steps:

[0051] (1) The biomass is made of tea dregs. After the tea dregs are crushed and washed with water, they are added to an acidic sodium chlorite solution for immersion treatment. The pH of the acidic sodium chlorite solution is adjusted to 4 with nitric acid, and the temperature of immersion is 100°C. After immersion, wash it with 95% ethanol solution to obtain biomass crude cellulose; take the above biomass crude cellulose and place it in 2% sodium hydroxide solution with a mass concentration of 2% and heat it to 100°C for alkali treatment for 30 minutes to remove Biomass cellulose is obtained after hemicellulose is dried for use.

[0052] (2) Add biomass cellulose to DMAC, and add LiCl, the dosage of LiCl is 60g / L, ultrasonic 6h under the condition of ultrasonic power 100W at 80°C to fully disperse the biomass cellulose in DMAC to obtain fibe...

Embodiment 3

[0061] A preparation method of biomass cellulose modified PVDF hollow fiber microfiltration membrane, comprising the following steps:

[0062] (1) The biomass is made of tea dregs. After the tea dregs are crushed and washed with water, they are added to the acidic sodium chlorite solution for immersion treatment. The pH of the acidic sodium chlorite solution is adjusted to 3.5 with nitric acid, and the temperature of the immersion is 100°C. After the impregnation, it was washed with 95% ethanol solution to obtain biomass crude cellulose; the above biomass crude cellulose was placed in a 2% sodium hydroxide solution and heated to 120°C for alkali treatment for 50 minutes. After removing the hemicellulose, the biomass cellulose is obtained, which is dried for use.

[0063] (2) Add biomass cellulose to DMAC, and add LiCl, the dosage of LiCl is 60g / L, ultrasonic 6h under the condition of ultrasonic power 100W at 80°C to fully disperse the biomass cellulose in DMAC to obtain fibers...

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Abstract

The invention discloses a biomass cellulose modified PVDF (Polyvinylidene Fluoride) hollow fiber microfiltration membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out dipping treatment on biomass by using an acidic sodium chlorite solution to obtain biomass cellulose; dispersing the biomass cellulose into DMAC to obtaina cellulose-DMAC system; adding PVDF, a pore-foaming agent and a modifier into the cellulose-DMAC system for dispersion, and carrying out negative-pressure defoaming treatment to obtain a membrane casting solution; and adjusting the reaction pressure and temperature, controlling gel conditions and spinning conditions, and adopting an NIPS method to obtain the biomass cellulose modified PVDF hollow fiber microfiltration membrane. Biomass cellulose is used for modifying PVDF, due to introduction of hydrophilic groups, the surface of the membrane shows higher membrane surface tension, more hydrogen-bond interaction is generated at the interface between water and the membrane, hydrophobic substances can be effectively prevented from getting close to the interface layer, the pollution resistance is higher, and the flux and the mechanical strength are higher.

Description

technical field [0001] The invention belongs to the membrane separation technology in the field of waste water treatment, and in particular relates to a biomass cellulose modified PVDF hollow fiber microfiltration membrane and a preparation method and application thereof. Background technique [0002] Membrane separation technology is a cutting-edge technology for water treatment applications. The principle of membrane separation is to use the osmosis of the membrane to realize the separation and concentration process of various components under the impetus of external pressure or energy. Ultra-microfiltration technology is widely used in the purification of drinking water, the advanced treatment and reuse of domestic sewage and industrial wastewater, and the separation of materials in certain industries. [0003] MBR, also known as Membrane Bio-Reactor (Membrane Bio-Reactor), is a new type of water treatment technology that combines a membrane separation unit with a biologi...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/08B01D69/02B01D71/34B01D61/14C02F3/00
CPCB01D67/0011B01D69/08B01D69/02B01D71/34B01D61/147C02F3/00B01D2325/36B01D2325/24B01D2325/023
Inventor 谢超孔令涛张开胜何军勇吴子健刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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