Activated carbon-loaded nano-zinc oxide ozonation catalyst and preparation and use thereof

A nano-zinc oxide, ozone oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as catalyst loss, achieve efficient adsorption, good The effect of catalytic ozone oxidation

Inactive Publication Date: 2016-10-12
天津大拇指环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problems to be solved in the present invention are: (1) after using activated carbon-loaded nano-zinc oxide as a catalyst, the loss of the catalyst can be avoided; (2) granular activated carbon-loaded nano-zinc oxide can be applied to the sewage treatment system for continuous treatment without the need for cumbersome Catalyst recovery process

Method used

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  • Activated carbon-loaded nano-zinc oxide ozonation catalyst and preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 600g of zinc nitrate and prepare a saturated solution; weigh 350g of urea and dissolve it in 3150g of distilled water; select 2-3mm activated carbon particles and soak them in 10% sodium hydroxide solution for 12 hours, and wash them with distilled water until the pH value of the cleaning solution reaches Until it changes again, soak it in 10% nitric acid for 3 hours, wash it with distilled water, and dry it for later use. First add the dried pretreated activated carbon particles into the above-mentioned zinc nitrate solution, heat to 40°C, and then add the prepared urea solution while stirring for 8 hours. After the reaction, the product was filtered, washed and dried, and sent to a horse boiler, and roasted in a nitrogen atmosphere at 600°C for 3 hours to obtain a finished catalyst.

Embodiment 2

[0020] Weigh 300g of zinc nitrate and make a saturated solution; weigh 200g of urea and dissolve it in 800g of distilled water; pick 2-3mm activated carbon particles and soak them in 5% sodium hydroxide solution for 20 hours, and wash them with distilled water until the pH value of the cleaning solution reaches Until it changes again, soak it in 10% nitric acid for 4 hours, wash it with distilled water, and dry it for later use. First add the dried pretreated activated carbon particles into the above-mentioned zinc nitrate solution, heat to 50°C, and then add the prepared urea solution while stirring and reacting for 6 hours. After the reaction, the product was filtered, washed and dried, and sent to a horse boiling furnace, and roasted for 3 hours in a nitrogen atmosphere at 500°C to obtain a finished catalyst.

Embodiment 3

[0022] Weigh 900g of zinc nitrate and prepare a saturated solution; weigh 600g of urea and dissolve it in 2400g of distilled water; pick 2-3mm activated carbon particles and soak them in 10% sodium hydroxide solution for 16 hours, and wash them with distilled water until the pH value of the cleaning solution reaches Until it changes again, soak it in 8% nitric acid for 5 hours, wash it with distilled water, and dry it for later use. First add the dried pretreated activated carbon particles into the above-mentioned zinc nitrate solution, heat to 40°C, and then add the prepared urea solution while stirring for 8 hours. After the reaction, the product was filtered, washed and dried, and sent to a horse boiler, and roasted for 4 hours in a nitrogen atmosphere at 600°C to obtain a finished catalyst.

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Abstract

The invention relates to an activated carbon-loaded nano-zinc oxide ozonation catalyst and preparation and use thereof. The catalyst is prepared by loading nano-zinc oxide on the surface of modified activated carbon. The modified activated carbon carrier is prepared by cleaning activated carbon with a sodium hydroxide solution, then dipping with dilute nitric acid, cleaning with deionized water and then drying. According to the catalyst disclosed by the invention, active components are prepared by adopting a coprecipitation method and taking zinc nitrate as a precursor; zinc hydroxide precipitate is generated by using a saturated zinc nitrate solution and a saturated urine solution and is attached to the surface of the modified activated carbon, and then the activated carbon the surface of which is attached with the zinc hydroxide is dried and roasted to prepare the oxidization catalyst. That is, the adsorption property of the activated carbon is reserved, and nano-zinc oxide microparticles having ozone catalysis activity are loaded in the activated carbon. Under the synergistic effect of adsorption and activation, organic pollutants in water can be adsorbed at high efficiency, and meanwhile, ozone molecules can be catalyzed and activated to produce free radicals having high oxidizability, thereby obtaining a better catalytic ozonation effect.

Description

Technical field: [0001] The invention relates to the field of ozone catalysts for sewage treatment. Background technique: [0002] At present, the types and discharges of domestic sewage and industrial wastewater are increasing, and the composition is more complex, which contains many refractory organic substances, such as dyes, phenols, phenols, pesticides, polychlorinated biphenyls, polycyclic aromatic hydrocarbons, nitroaromatic compounds, alkanes, etc. Base benzene sulfonic acid and humic acid etc. These refractory organics are difficult to remove by traditional ozone oxidation process. Although the application of ozone oxidation technology in water treatment is very extensive, and it also shows incomparable superiority, it still has certain limitations. First, the utilization efficiency of ozone is not high, and the cost of ozone generation is high, resulting in The cost of treatment is high; however, with the improvement of the level of ozone produced by people, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J20/20B01J20/30C02F1/28C02F1/78C02F101/30
CPCB01J23/06B01J20/20C02F1/283C02F1/725C02F1/78C02F2101/30
Inventor 陈琴波贺国臣曲胜阳陈青松
Owner 天津大拇指环境工程有限公司
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