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Sea squirt nano cellulose ultrafiltration membrane as well as preparation method and application of sea squirt nano cellulose ultrafiltration membrane

A nanocellulose and ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membrane technology and other directions, can solve the problems of difficult treatment, high preparation cost, high quality of ceramic membrane, etc., and achieves low cost and simple preparation method. , the effect of simple preparation process

Active Publication Date: 2016-05-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Synthetic polymer ultrafiltration membranes usually require the use of harmful reagents and coagulants to achieve phase transitions, while ceramic membranes are heavy, difficult to handle, and costly to prepare

Method used

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  • Sea squirt nano cellulose ultrafiltration membrane as well as preparation method and application of sea squirt nano cellulose ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After dissecting the ascidian, 500 g (wet weight) of the rucksack was treated with 1.5L of 5wt% NaOH solution at 80°C for 24 hours, washed with deionized water until neutral, and then treated twice with alkali in the same way. With 1.5L1.2wt% H 2 o 2 The solution is bleached at 80°C under weakly alkaline conditions (pH 8~9), and 30g of 30%H is added every 3h 2 o 2 , After reacting for 12 hours, rinse with deionized water, dry and crush to obtain 25g of purified product. To prepare sea squirt nanocellulose suspension, 10g sea squirt cellulose was dispersed in 500g 65wt% sulfuric acid and hydrolyzed at 70°C for 2h, the reaction solution was diluted 10 times, centrifuged and washed continuously at 10000rpm until the upper liquid became turbid, and then dialyzed into water until the conductivity remained constant . The suspension was concentrated to a certain concentration by rotary evaporation, and the concentration measured by gravimetric method was 3%.

Embodiment 2

[0018] 20mL of 0.01wt% ascidian nanocellulose aqueous suspension was suction-filtered with a common filter membrane with a pore size of 0.22 μm to prepare a sea squirt nanocellulose ultrafiltration membrane. The ultrafiltration membrane has a thickness of 2 μm and a pore size of ≤30 nm. The ultrafiltration membrane was used to separate bovine serum albumin with a concentration of 10 mg / mL, and the separation rate was 80%. In addition, the ultrafiltration membrane is used for emulsified oil separation test, and the microemulsion of isooctane and water is separated at a mass ratio of 1:99. The ultrafiltration membrane is conducive to demulsification or oil droplet condensation, and effectively intercepts emulsified oil droplets to achieve oil-water separation. Purpose. The separation efficiency of the filter membrane is 90%, and the flow rate is 7710L m -2 h -1 ·MPa -1 .

Embodiment 3

[0020] Take 0.5wt% sea squirt nanocellulose aqueous suspension 3mL, use the 0.22μm pore size ordinary filter membrane, suction filter to make sea squirt nanocellulose ultrafiltration membrane. The ultrafiltration membrane has a thickness of 9 μm and a pore size of ≤30 nm. The ultrafiltration membrane was used to separate bovine serum albumin with a concentration of 10 mg / mL, and the separation rate was 90%. In addition, the ultrafiltration membrane is used for emulsified oil separation test, and the microemulsion of isooctane and water is separated at a mass ratio of 1:99. The ultrafiltration membrane is conducive to demulsification or oil droplet condensation, and effectively intercepts emulsified oil droplets to achieve oil-water separation. Purpose. The separation efficiency of the filter membrane is 99%, and the flow rate is 2100L m -2 h -1 ·MPa -1 .

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Abstract

The invention discloses a preparation method of a sea squirt nano cellulose ultrafiltration membrane. According to the method disclosed by the invention, sea squirt nano cellulose water suspension is prepared by using an acidolysis method; a common filter membrane is used as a substrate; the sea squirt nano cellulose water suspension is pumped and filtered to form the ultrafiltration membrane. The pore diameter size of the ultrafiltration membrane can be controlled through electrolytes including an acid, an alkali and salt and the like, so that micro-nano particles with different sizes are separated. The invention further discloses application of the ultrafiltration membrane in the aspects of protein concentration, oil-water separation and the like. The sea squirt nano cellulose ultrafiltration membrane prepared by the scheme can be used for effectively separating emulsified oil from proteins, and the preparation method is simple and feasible and low in cost, and has no toxin.

Description

technical field [0001] The invention relates to a sea squirt nano-cellulose ultrafiltration membrane, a preparation method and application thereof, and belongs to the fields of chemical engineering and polymer functional materials. Background technique [0002] Oily wastewater is one of the common sources of environmental pollution, which seriously threatens human health and social development. Both water treatment and oil recovery require effective separation of oily wastewater. Oils are divided into slick oil, dispersed oil, and emulsified oil according to the different states of existence in oily wastewater. Traditional oil-water separation methods such as gravity separation, centrifugal separation, flotation, and coarse granulation can only effectively separate floating oil and dispersed oil, while emulsified oil is difficult to separate because it is in a stable state and the oil droplet size is small (less than 10 μm). are effectively separated. Commonly used chemic...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D67/00B01D61/14C02F1/44
CPCB01D61/145B01D67/0002B01D71/10C02F1/444
Inventor 常春雨张俐娜程巧云汪森
Owner WUHAN UNIV
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