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A preparation method of hollow fiber composite membrane with catalytic ozonation function

An ozone oxidation and fiber composite technology, applied in chemical instruments and methods, oxidized water/sewage treatment, physical/chemical process catalysts, etc., can solve the problem of insufficient ozone mass transfer efficiency, reduced ozone mass transfer efficiency, and large reactor volume. and other problems, to achieve the effect of fast ozone mass transfer rate, good effect and small volume

Active Publication Date: 2021-01-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ozone mass transfer efficiency of traditional reactors is not high enough, and the reactor volume is often large
In addition, traditional reactors are prone to problems such as flooding, emulsion, foam and mist entrainment, which further reduce the mass transfer efficiency of ozone

Method used

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  • A preparation method of hollow fiber composite membrane with catalytic ozonation function
  • A preparation method of hollow fiber composite membrane with catalytic ozonation function
  • A preparation method of hollow fiber composite membrane with catalytic ozonation function

Examples

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Effect test

Embodiment 1

[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0030] Example 1

[0031] The preparation process of the hollow fiber composite membrane proposed by the present invention can be found in figure 1 .

[0032] Alumina hollow fiber ceramic membrane (outer diameter 2mm, inner diameter 1mm, average pore diameter 0.5μm) was cut to 15cm long, ultrasonically cleaned in deionized water for 30min, and dried at 120°C; 400g of the above ceramic membrane was soaked in 1000ml 40wt% manganese nitrate aqueous solution Take it out after 4 hours, and dry it at 120°C for 2 hours;

[0033] Sinter the above hollow fiber membrane at 500°C for 24 hours, take it out after natural cooling, and dry it at 120°C for 2 hours after ultrasonic cleaning;

[0034] Mix 100g of polyvinylidene fl...

Embodiment 2

[0040] In this example, the ozone oxidation of the hollow fiber composite membrane prepared in Example 1 was compared.

[0041] Prepare 5 hollow fiber composite membranes without manganese oxide nanoparticles according to the method of Example 1, each with a length of 15 cm;

[0042]Prepare the above-mentioned hollow fiber composite membranes loaded / unloaded with nanoparticles as one membrane module, each membrane module contains 5 membranes, and the effective length is 8cm;

[0043] use as Figure 4 The test device shown in the figure carries out the comparison test of its oxidation effect; in the figure, 4-1, ozone generator; 4-2, ozone concentration analyzer; 4-3, hollow fiber membrane module; 4-4, peristaltic pump; 4- 5. Raw material liquid tank. The raw material solution is 100μg / L nitrobenzene solution, the pH of the solution is 1-5, the ozone concentration is 30mg / L, the ozone flow rate is 30ml / min, the reaction time is 15min, and the reaction temperature is 20°C.

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Abstract

A method for preparing a hollow fiber composite membrane with catalytic ozonation function: comprising the following steps: a) soaking the ceramic hollow fiber membrane in a metal salt precursor solution and drying; b) heating the soaked membrane to high temperature Sintering; c) repeating the steps a) and b) above until the specified load; d) immersing the above-mentioned loaded film in the casting solution, and placing it in a non-solvent phase to gel to form a hydrophobic film surface. The above-mentioned hollow fiber composite membrane is used in the ozone treatment process of water and wastewater, which can effectively improve the ozone mass transfer rate, the pollutant degradation rate, and solve the problem of difficult catalyst recovery, which can realize small reactor volume and low energy consumption during the reaction process. lower effects.

Description

technical field [0001] The invention relates to a method for preparing a hollow fiber composite membrane with catalytic ozone oxidation function, belonging to the field of water treatment. Background technique [0002] Ozone is widely used in water and wastewater treatment processes, such as drinking water disinfection and wastewater decolorization. In the ozone oxidation process, the reaction rate of ozone and pollutants and the mass transfer rate of ozone are the key factors affecting its treatment effect. [0003] The reaction process of ozone and pollutants includes two ways: direct reaction and indirect reaction. Its direct reaction rate constant is generally low (k D 1.0-10 3 m -1 the s -1 ), and the selectivity is strong, its ozone utilization efficiency is low, and the degradation rate of pollutants is slow. In practical applications, the indirect reaction pathway of hydroxyl radicals is mostly carried out, and the reaction rate constant is relatively high (k ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/78B01J23/34B01J35/06B01J35/10B01D67/00B01D69/12B01D69/08
CPCB01D67/0079B01D69/08B01D69/12C02F1/44C02F1/725C02F1/78B01J23/34B01D2325/10B01D2323/04B01D2325/38C02F2101/38B01J35/59B01J35/61
Inventor 王军张勇侯得印赵长伟曹爱新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI