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Rare earth doped microporous silicon dioxide hybrid membrane and preparation method thereof

A technology of microporous silica and rare earth doping, applied in the field of membrane separation, to achieve good repeatability, easy operation, and simple preparation process

Active Publication Date: 2018-07-06
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few research reports on microporous silica membrane materials based on pervaporation desalination with high-concentration brine (such as ≥3.5wt% NaCl solution) as feed liquid at low temperature (or room temperature), especially at room temperature. Membrane materials with high permeation flux and high rejection rate need to be developed urgently

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  • Rare earth doped microporous silicon dioxide hybrid membrane and preparation method thereof
  • Rare earth doped microporous silicon dioxide hybrid membrane and preparation method thereof
  • Rare earth doped microporous silicon dioxide hybrid membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Add 4.6mL of 1,2-bis(triethoxysilyl)ethane to 88.7mL of absolute ethanol, stir vigorously at room temperature for 3 hours, and then place the above mixture in an ice-water bath Add 0.0902g of yttrium nitrate and 0.3075g of lanthanum nitrate, after stirring vigorously for 3 hours, add a certain amount of nitric acid and deionized water dropwise under stirring conditions, so that 1,2-bis(triethoxysilyl ) The molar ratio of ethane: yttrium: lanthanum: nitric acid: deionized water: ethanol is 1: 0.019: 0.056: 0.15: 80: 120, and the molar ratio La: Y can be obtained by stirring continuously for 6 hours under the condition of constant temperature water bath at 60°C. = 25:75 rare earth doped silica sol;

[0025] (2) Tubular Al with an average pore size of 200 nm 2 o 3 The porous support is immersed in the silica sol obtained in the step (1) diluted 10 times with absolute ethanol, put into a constant temperature and humidity box after dipping for 20 seconds, and dry for 1...

Embodiment 2—5

[0031]Keep the doping content of rare earth salt in the silica sol unchanged (La+Y): the ratio of Si is 0.075:1 (molar ratio), change the ratio of La:Y, other preparation conditions are the same as in Example 1, and a A series of silicon dioxide hybrid films with different La / Y doping ratios (i.e. Examples 2-5). The pervaporation desalination performance of these silica hybrid membranes was tested at a room temperature of 25° C. using NaCl solution with an initial concentration of 3.5 wt % as the feed solution. The results are shown in Table 2.

[0032] Table 2. Desalination properties of silicon dioxide hybrid membranes with different La / Y doping ratios in Examples 2-5

[0033]

Embodiment 6—9

[0035] Keep the molar ratio of La:Y doped in the silica sol at 25:75, change the ratio of rare earth salt doping amount (La+Y):Si, and other preparation conditions are the same as Example 1, and a series of different La / Y doped silicon dioxide hybrid film (i.e. Examples 6-9). The pervaporation desalination performance of these silica hybrid membranes was tested at a room temperature of 25° C. using NaCl solution with an initial concentration of 3.5 wt % as the feed solution. The results are shown in Table 3.

[0036] Table 3. Desalination properties of silicon dioxide hybrid membranes with different La / Y doping amounts in Examples 6-9

[0037]

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Abstract

The invention relates to a high-performance silicon dioxide hybrid membrane used for high-concentrate seawater or salt-containing wastewater desalination treatment and a preparation method thereof. Rare earth is doped into synthesized sol, and the structure of an organic silane precursor is controlled to prepare the high-performance rare earth doped microporous silicon dioxide hybrid membrane witha membrane hole diameter smaller than or equal to 0.60 nm, so that salt ions in seawater (wastewater) can be effectively held back, and therefore, the high-performance silicon dioxide hybrid membranehas high-throughout high-rejection-rate pervaporation desalination performance at room temperature. The method has a simple preparation process, is easy to operate, and has very good repeatability; and the prepared hybrid membrane has excellent long-time hydrothermal stability, is especially suitable for high-concentration seawater or salt-containing wastewater which is difficult to treat throughreverse osmosis membrane technology, and can meet large-scale industrial application requirements.

Description

technical field [0001] The invention relates to a preparation method of a rare earth-doped microporous silicon dioxide hybrid membrane with high permeation flux and its pervaporation desalination application, belonging to the technical field of membrane separation. Background technique [0002] With the rapid development of the economy, the shortage of fresh water resources in the world has become a problem of increasing concern to people. The shortage of fresh water resources caused by extreme weather such as drought, industrial pollution, and ecological environment deterioration is becoming more and more serious. Desalination and desalination of seawater, which accounts for more than 99% of the world's total water resources, has become one of the important ways to solve the water resource crisis. Compared with the traditional thermal desalination technology, membrane technology represented by reverse osmosis has the advantages of low investment, low energy consumption, les...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00C02F1/44C02F103/08
CPCB01D67/0013B01D71/027C02F1/441C02F1/448C02F2103/08Y02A20/131
Inventor 张小亮张华宇邵琦罗芳颖
Owner JIANGXI NORMAL UNIV
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