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Ultrafiltration membrane surface modifier and modification method

A surface modifier and ultrafiltration membrane technology, applied in the field of ultrafiltration membranes, can solve problems such as ultrafiltration membrane pollution, and achieve the effects of reducing pollution, reducing direct contact, and increasing anti-pollution ability.

Active Publication Date: 2019-12-03
HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after a certain period of operation of the ultrafiltration membrane, the ultrafiltration membrane will inevitably be polluted

Method used

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  • Ultrafiltration membrane surface modifier and modification method
  • Ultrafiltration membrane surface modifier and modification method
  • Ultrafiltration membrane surface modifier and modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of ultrafiltration membrane surface modifier, comprises following component: diatomaceous earth, yttrium sulfate, titanium dioxide; The preparation method of described ultrafiltration membrane surface modifier comprises the following steps:

[0026] S1. Dissolve 2 kg of diatomite with a mesh number of 300 mesh and 0.1 kg of titanium dioxide with a mesh number of 600 mesh in sulfuric acid solution, stir at a rate of 200 r / min for 20 hours, filter, and dry;

[0027] S2. Add the substance obtained in S1 to 5kg of yttrium sulfate solution with a concentration of 0.01mol / L, stir for 12h at a rate of 100r / min, filter, and dry;

[0028] S3. Mix the substance obtained in S2 with 0.01 kg of chlorinated paraffin and then calcinate to obtain the surface modifier, wherein the calcining specifically includes: first heating up from room temperature to 250°C at 5°C / min, and keeping the temperature for 3h; ℃ / min to cool down to 190°C, hold for 0.5h; then heat up to 350°C at 10°C...

Embodiment 2

[0033] A kind of ultrafiltration membrane surface modifier, comprises following component: diatomaceous earth, yttrium sulfate, titanium dioxide; The preparation method of described ultrafiltration membrane surface modifier comprises the following steps:

[0034] S1. Dissolve 2.2 kg of diatomite with a mesh number of 350 mesh and 0.15 kg of titanium dioxide with a mesh number of 650 mesh in sulfuric acid solution, stir at a rate of 350 r / min for 20 hours, filter, and dry;

[0035] S2. Add the substance obtained in S1 to 7kg of yttrium sulfate solution with a concentration of 0.03mol / L, stir for 15h at a rate of 200r / min, filter, and dry;

[0036] S3. Mix the substance obtained in S2 with 0.01 kg of chlorinated paraffin and then calcinate to obtain the surface modifier, wherein the calcining specifically includes: first heating up from room temperature to 255°C at 8°C / min, and keeping the temperature for 4h; ℃ / min to cool down to 195°C, keep warm for 0.8h; then raise the temper...

Embodiment 3

[0041] A kind of ultrafiltration membrane surface modifier, comprises following component: diatomaceous earth, yttrium sulfate, titanium dioxide; The preparation method of described ultrafiltration membrane surface modifier comprises the following steps:

[0042] S1. Dissolve 2.5 kg of diatomite with a mesh number of 400 mesh and 0.1 kg of titanium dioxide with a mesh number of 700 mesh in sulfuric acid solution, stir at a rate of 500 r / min for 20 hours, filter, and dry;

[0043] S2. Add the substance obtained in S1 to 8kg of yttrium sulfate solution with a concentration of 0.05mol / L, stir for 18h at a rate of 300r / min, filter, and dry;

[0044]S3. Mix the material obtained in S2 with 0.05 kg of chlorinated paraffin and then calcinate to obtain the surface modifier, wherein the calcining specifically includes: first heating up from room temperature to 260°C at 10°C / min, and keeping the temperature for 5h; ℃ / min to cool down to 200°C, hold for 1 hour; then heat up to 360°C at 1...

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Abstract

The invention provides an ultrafiltration membrane surface modifier. By mixing diatomaceous earth with titanium dioxide, a mixture is added to an yttrium sulfate solution and mixed with chlorinated paraffin, and then calcining is performed; modification of diatomaceous earth is performed by yttrium sulfatecan to increase internal channels of diatomaceous earth and increase the active center of diatomaceous earth; the decomposition of added chlorinated paraffin during calcining can further increase the channels of the diatomaceous earth, and the performance of the ultrafiltration membrane is enhanced; the surface modification of the ultrafiltration membrane is performed by the modifier to form a coating on the surface of the ultrafiltration membrane, direct contact between the pollutant andthe ultrafiltration membrane is reduced, the pollution of the ultrafiltration membrane is reduced, and anti-pollution ability of the ultrafiltration membrane is increased; and after the ultrafiltration membrane is modified by the ultrafiltration membrane surface modifier, the removal rate of chemical oxygen demand, total organic carbon and ammonia nitrogen in sewage is improved compared with an ultrafiltration membrane without modification, and meanwhile, the surface modifier further contains titanium dioxide, and can catalyze the decomposition and degradation of the pollutants.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membranes, in particular to an ultrafiltration membrane surface modifier and a modification method. Background technique [0002] Ultrafiltration membrane separation technology is more and more widely used in the field of advanced sewage treatment. Its remarkable characteristics of operating at room temperature and low pressure, no phase change, and low energy consumption have become a standard for separation processes. Ultrafiltration technology has been widely used. usage of. With the development of membrane technology and large-scale production, the performance of ultrafiltration membrane is more stable, and the cost of mold making is greatly reduced. Ultrafiltration membranes have been widely used in various purification, concentration, purification, clarification, recovery, and sterilization processes, covering various fields such as water treatment, food and beverage, wine, pharmace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D61/14B01D69/08
CPCB01D67/0093B01D61/145B01D69/08B01D2325/30B01D2323/12
Inventor 陈泉学
Owner HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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