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A high-strength wastewater treatment catalyst and its preparation method and application

A wastewater treatment, high-strength technology, applied in the direction of physical/chemical process catalysts, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of poor compressive resistance and wear resistance of catalysts, and achieve compressive strength and wear resistance Enhanced properties, high pore volume, and ease of mass production

Active Publication Date: 2020-12-11
中国科学院上海硅酸盐研究所湖州先进材料产业创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the problems of poor pressure resistance and wear resistance of catalysts for wastewater treatment, the object of the present invention is to provide a high-strength wastewater treatment catalyst with low energy consumption, simple operation, and suitable for use of shaped catalyst carriers, and its preparation method and application

Method used

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  • A high-strength wastewater treatment catalyst and its preparation method and application
  • A high-strength wastewater treatment catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 300g activated alumina balls (diameter 2-4mm, specific surface area 240m 2 / g, crushing strength is 50N) in 400g total salt concentration is 1wt% NaCl-KCl aqueous solution (NaCl and KCl molar ratio is 1:1) in immersing 12h, drain and dry naturally; Dry for 15 hours, put it in a muffle furnace and bake at 300°C for 3 hours; when the temperature drops to room temperature, rinse with water several times, drain and dry naturally; then dry at 120°C for 10 hours, and finally get the catalyst carrier with enhanced treatment , the specific surface area is 225m 2 / g, the crushing strength is 72N.

[0048] The alumina carrier after the above treatment was immersed in 150ml of ferric nitrate nonahydrate aqueous solution with a mass concentration of 30% for 12h, drained and dried naturally; then dried at 120°C for 15 hours, and placed in a muffle furnace at 400°C Calcined for 6 hours, the alumina-supported iron oxide catalyst used in this test was finally obtained. In the alumin...

Embodiment 2

[0052] With 300g strip alumina (diameter 2mm, length 5mm, specific surface area is 240m 2 / g, crushing strength is 40N) in 450g total salt concentration is 0.5wt% NaCl-KCl aqueous solution (the molar ratio of NaCl and KCl is 1:1) in immersion 12h, drain and dry naturally; Then at 120 ℃ Dry it for 15 hours, put it in a muffle furnace and bake it at 350°C for 3 hours; when the temperature drops to room temperature, rinse it with water several times, drain it and dry it naturally; then dry it at 120°C for 10 hours, and finally get the catalyst with enhanced treatment Carrier (specific surface area is 228m 2 / g, crushing strength is 70.2N).

[0053]The alumina carrier after the above treatment is immersed in 150ml of a mixed aqueous solution of ferric nitrate nonahydrate and cerium nitrate with a mass concentration of 30% (the molar ratio of ferric nitrate and cerium nitrate is 10:1), soaked for 12h, drained and aired naturally Dry; then dry at 120°C for 15 hours, place in a muf...

Embodiment 3

[0057] 100g strip activated carbon (diameter 2mm, length 5mm, specific surface area is 700m 2 / g, strength is 90%) in 200g total salt concentration is 0.5wt% Na 2 SO 4 -K 2 SO 4 In the mixed aqueous solution (Na 2 SO 4 with K 2 SO 4 The molar ratio is 1:1), soaked in 12h, drained and dried naturally; then dried at 120°C for 15 hours, placed in a tube furnace, and roasted at 400°C for 3 hours under vacuum; when the temperature dropped to room temperature, water Rinse for the first time, drain and dry naturally; then dry at 120°C for 10 hours to finally obtain a modified catalyst carrier (specific surface area is 694m 2 / g, the strength is 94%).

[0058] The activated carbon carrier after the above treatment is immersed in 150ml of 30% ferric nitrate nonahydrate aqueous solution for 12h, drained and dried naturally; then dried at 120°C for 15 hours, placed in a tube furnace under vacuum for 400 °C for 6 hours to finally obtain the activated carbon-supported iron oxide c...

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Abstract

The invention relates to a high-strength wastewater treatment catalyst and a preparation method and application thereof. The preparation method comprises the steps that a catalyst carrier is dipped into a mixed solution containing at least two inorganic salts at a time and then is taken out for thermal treatment, the enhanced catalyst carrier is obtained, and the inorganic salts include alkali metal salts or / and alkaline metal salts; the enhanced catalyst carrier loads active components, and the high-strength wastewater treatment catalyst is obtained. The obtained high-strength wastewater treatment catalyst is large in specific surface area and high in reactivity and strength, the compressive strength reaches 60-80 N, and the using requirement for a fixed bed catalyst chamber can be met.

Description

technical field [0001] The invention relates to a high-strength wastewater treatment catalyst, a preparation method and application thereof, and belongs to the technical field of water treatment. Background technique [0002] Advanced sewage treatment processes mainly include membrane separation, activated carbon adsorption, and advanced oxidation. Due to the complexity of the wastewater system, the membrane separation method will cause serious membrane fouling, which not only seriously affects the operation stability, but also significantly increases the operation cost. Although the activated carbon adsorption method has a good enrichment effect on most organic pollutants, the application of the activated carbon adsorption method is very limited due to the high regeneration cost of activated carbon and complicated devices. The most important thing is that the above two methods can only achieve the enrichment or transfer of pollutants, but cannot completely eliminate pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J23/83B01J23/888C02F1/76C02F1/78
CPCB01J23/745B01J23/83B01J23/888C02F1/722C02F1/725C02F1/766C02F1/78
Inventor 刘阳桥杨庆峰齐振一张涛宋力昕
Owner 中国科学院上海硅酸盐研究所湖州先进材料产业创新中心
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