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Preparation method and application of anti-pollution silicon-titanium copolymerized composite membrane

A composite membrane, anti-pollution technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem that the structure of the modifier is difficult to control and characterize, the related mechanism is complex, and it is difficult to achieve effective surface modification of membrane pores. and other problems to achieve the effect of excellent water flux

Active Publication Date: 2019-05-31
CHANGZHOU UNIV
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Problems solved by technology

[0003] The surface grafting method refers to the method of introducing surface modification groups on the surface of the membrane through chemical reactions to improve the anti-fouling properties of the membrane, but the grafting process and related mechanisms are complicated, and the modifier structure of the modified surface obtained is not easy to control and Characterization, long-chain polymer segments may reduce the permeability of the membrane, making it difficult to effectively modify the membrane pore surface
Inorganic additives (Ag 2 O, SiO 2 、TiO 2 etc.) are easy to form agglomerates in the casting liquid and cannot be uniformly dispersed in the matrix, which changes the physical and chemical properties of the membrane, resulting in unsatisfactory anti-pollution modification effect

Method used

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  • Preparation method and application of anti-pollution silicon-titanium copolymerized composite membrane
  • Preparation method and application of anti-pollution silicon-titanium copolymerized composite membrane
  • Preparation method and application of anti-pollution silicon-titanium copolymerized composite membrane

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Embodiment 1

[0024] (1) Preparation of silica-titanium polymerization sol: add 18.973g EtOH to a 100mL beaker, then add 1.000g BTESE and 0.192g TBT and stir for 2 minutes, add 1 to 2 drops of 37wt% concentrated hydrochloric acid in 3.655g water to prepare a hydrochloric acid solution, and then add the hydrochloric acid solution Slowly add it dropwise to the precursor solution, transfer the beaker to a constant temperature water bath at 50°C, continue stirring for 3 hours to obtain a silica-titanium sol and dilute its concentration to 0.5wt% with EtOH;

[0025] (2) Coating the silica-titanium sol prepared in step (1) on α-Al by rubbing method 2 O 3 On the sheet membrane, then calcined at 300 ° C for 30 min, repeating the above steps twice to obtain a silicon-titanium copolymer separation membrane;

[0026] (3) Use a separation membrane to separate the mixed aqueous solution containing 2000ppm sodium chloride (NaCl) and 800ppm bovine serum albumin (BSA). After running for 1 hour, wash the m...

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Abstract

The invention belongs to the field of separating membranes, and particularly relates to a preparation method and application of an anti-pollution silicon-titanium copolymerized composite membrane. Thepreparation method includes: allowing titanium source precursor and silicon source precursor to be in in-situ copolymerization to form silicon-titanium polymerized sol, and performing high-temperature calcining to form the silicon-titanium copolymerized composite membrane on the surface of a porous inorganic supporting body. In-situ copolymerization enables titanium oxide and silicon oxide to form a uniform and stable Ti-O-Si hybrid network structure, and the problem that TiO2 is nonuniform in dispersion in a matrix during general doping modification is solved. The silicon-titanium compositemembrane formed by in-situ copolymerization presents good anti-pollution performance and separation performance in water treatment like desalting.

Description

technical field [0001] The invention belongs to the field of separation membrane preparation, in particular to a preparation method and application of an anti-pollution silicon-titanium copolymer composite membrane. Background technique [0002] Membrane technology is widely used in the field of water treatment due to its low equipment cost, small size, high efficiency, less resource consumption in operation, easy maintenance, and environmental protection. However, there is also the problem of membrane pollution. The adsorption of particles, colloidal particles and organic matter in the water on the membrane surface will cause membrane fouling. Among them, organic matter and microbial fouling are the most difficult to solve, which will cause the water flux of the membrane to drop rapidly and the membrane lifespan is greatly shortened. At present, the anti-fouling properties of membranes are mainly improved by surface grafting of hydrophilic polymers and doping of anti-foulin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D69/12B01D69/02B01D67/00
Inventor 徐荣朱春晖钟璟
Owner CHANGZHOU UNIV
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