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Preparation method of high-flux chip type TiO2 nanofiltration membrane

A high-flux, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as low flux, and achieve the effect of high rejection rate and excellent nanofiltration performance.

Inactive Publication Date: 2013-02-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

E.g, and Zaspalis et al. prepared flake TiO 2 Nanofiltration membranes, these nanofiltration membranes have good nanofiltration performance, but the flux is low, and the level of flux will be directly related to the processing capacity of the nanofiltration membrane, which is closely related to the operating cost in the application process

Method used

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  • Preparation method of high-flux chip type TiO2 nanofiltration membrane
  • Preparation method of high-flux chip type TiO2 nanofiltration membrane
  • Preparation method of high-flux chip type TiO2 nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 2.1ml (0.01mol) of ethyl titanate with 8ml (0.14mol) of ethanol and stir for 15min to obtain a mixed solution M1. Mix 0.9mL (0.012mol) hydrochloric acid with 0.27mL (0.015mol) H 2 O mixed to obtain a mixed liquid M2. The mixed solution M1 was placed in an ice bath at 0° C., and the mixed solution M2 was added under the condition of stirring. After stirring and mixing for 15 minutes, it was quickly placed in a constant temperature water bath at 0°C for 2 hours. After the reaction, TiO with transparent appearance was obtained 2 polymeric sol. Store it at -20°C until use. Mix the sol and ethanol at a volume ratio of 1:5 to obtain a film-forming solution, and place the film-forming solution on the sheet-type γ-Al 2 o 3 The surface of the carrier is coated with a film, and at 2°C min -1 Sintering at a heating rate of 300°C, holding for 2 hours after reaching 300°C, and then cooling down naturally to obtain TiO 2 Nanofiltration. The pure water flux of the membran...

Embodiment 2

[0027] 3ml (0.01mol) of tetraisopropyl titanate and 40ml (0.52mol) of isopropanol were mixed and stirred for 8min to obtain a mixed solution M1. Mix 0.2mL (0.003mol) of nitric acid with 1mL (0.056mol) of H 2 O mixed to obtain a mixed liquid M2. The mixed solution M1 was placed in an ice bath at -20°C, and the mixed solution M2 was added under the condition of stirring. After stirring and mixing for 8 minutes, it was quickly placed in a constant temperature water bath at 80° C. for 3 hours. After the reaction, TiO with transparent appearance was obtained 2 polymeric sol. Store it at -20°C until use. The sol and isopropanol are mixed with a volume ratio of 1:12 to obtain a film-making solution, and the film-making solution is placed on the sheet-type TiO 2 The surface of the carrier is coated with a film, and at 1°C min -1 Sintering at a heating rate of 450°C, holding for 5 hours after reaching 450°C, and then cooling down naturally to obtain TiO 2 Nanofiltration. Charac...

Embodiment 3

[0029] 3.4ml (0.01mol) of butyl titanate and 65ml (0.71mol) of n-butanol were mixed and stirred for 16min to obtain a mixed solution M1. Mix 0.15mL (0.003mol) of sulfuric acid with 0.64mL (0.036mol) of H 2 O mixed to obtain a mixed liquid M2. The mixed solution M1 was placed in an ice bath at -10°C, and the mixed solution M2 was added under the condition of stirring. After stirring and mixing for 16 minutes, it was quickly placed in a constant temperature water bath at 40° C. for 5 hours. After the reaction, TiO with transparent appearance was obtained 2 polymeric sol. Store it at -20°C until use. The sol and n-butanol are mixed with a volume ratio of 1:18 to obtain a film-making solution, and the film-making solution is placed in a sheet-type ZrO 2 Carrier surface coating, and at 0.2 ℃ min -1 Sintering at a heating rate of 550°C, holding for 3 hours after reaching 550°C, and then cooling down naturally to obtain TiO 2 Nanofiltration. Characterized, TiO 2 The pure wat...

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Abstract

The invention relates to a preparation method of a high-flux chip type TiO2 nanofiltration membrane, which comprises the following steps that a titanium alkoxide is used as a precursor, a sol-gel method is adopted, process parameters are strictly controlled, TiO2 polymerization sol with appropriate performance is prepared, a membrane is coated on a chip type carrier, and then the chip type TiO2 nanofiltration membrane is obtained. The flux of the chip type TiO2 nanofiltration membrane is higher, and the processing capacity of the nanofiltration membrane can be increased, thereby reducing the operating cost in the process of application. Additionally, the nanofiltration membrane has excellent nanofiltration performance, the molecular weight cut off (MWCO) of the TiO2 nanofiltration membrane is less than 1000 Da, the retention rate of the membrane on heavy metal ions Cu(NO3)2, Ni(NO3)2 and ZnCl2 with the concentration of 200 mg / L can reach 80 to 90%, and therefore, the foundation is laid for the application of the TiO2 nanofiltration membrane in the industrial process.

Description

Technical field: [0001] The invention relates to a high-throughput sheet-type TiO 2 Preparation method of nanofiltration membrane. The TiO 2 Nanofiltration membranes will have broad application prospects in industrial applications such as water treatment, dyes, food and medicine. Background technique: [0002] Membrane separation technology has the advantages of simple process, no chemical change and phase change, no heating and environmental friendliness, etc. It is widely used in various separation, refining and concentration processes in water treatment, dyes, food, medicine and chemical industry. Nanofiltration membranes are widely used due to their high rejection rate for small molecular organics and high-valent ions. [0003] According to the different properties of membrane materials, nanofiltration membranes can be divided into organic nanofiltration membranes and inorganic nanofiltration membranes. Among them, the preparation method of organic membranes is relati...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/06B01D67/00
Inventor 漆虹牛淑锋徐南平
Owner NANJING UNIV OF TECH