A water treatment method utilizing graphene oxide to catalyze ozone

A graphene and water treatment technology, applied in oxidation water/sewage treatment, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as limitation and low reaction rate, achieve fast oxidation rate, easy availability of raw materials, The effect of enriching oxygen-containing groups

Active Publication Date: 2017-09-26
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, due to the selective oxidation characteristics of ozone and the low reaction rate with pollutants, it is limited in the field of water treatment.

Method used

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  • A water treatment method utilizing graphene oxide to catalyze ozone
  • A water treatment method utilizing graphene oxide to catalyze ozone

Examples

Experimental program
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Effect test

example 1

[0038] Example 1: Combination of Graphene Oxide (GO) and Ozone

[0039] Add graphene oxide to the ozone reactor equipped with 1mmol / L oxalic acid aqueous solution whose pH has been adjusted by phosphate, so that the mass concentration of graphene oxide is 20mg / L, the feed concentration is 10mg / L, and the flow rate is 0.4NL / min of ozone, using ozone to aerate the oxalic acid aqueous solution added with graphene oxide, sampling every 20min, removing graphene oxide by filtration with a 0.22 μm syringe filter, and measuring the concentration of oxalic acid. Wherein, the residence time of the oxalic acid aqueous solution in the ozone reactor is controlled to be 60 minutes, and the state of stirring and passing ozone is kept during the water treatment process. Then draw the removal rate graph, such as figure 1 Histogram in GO+O 3 shown.

[0040] In the first example, the graphene oxide can be added directly in the form of solid graphene oxide or in the form of graphene oxide sol...

example 2

[0047] Example 2: Graphene oxide (GO) combined with ozone

[0048] Add graphene oxide in the ozone reactor that is equipped with the 50 μ mol / L DEET solution that has adjusted pH through phosphate, make the mass concentration of graphene oxide be 20mg / L, pass into concentration and be 5mg / L, flow rate is 0.4NL / min of ozone, use ozone to aerate the DEET solution added with graphene oxide, take samples every 2min, filter the graphene oxide with a 0.22μm syringe filter, and measure the DEET concentration. Among them, the residence time of the DEET solution in the ozone reactor is controlled to be 10 minutes, and the state of stirring and ozone is kept during the water treatment process. Then draw the removal rate graph, such as figure 2 Histogram in GO+O 3 shown.

[0049] In the second example, the graphene oxide can be added directly in the form of solid graphene oxide or in the form of graphene oxide solution. The phosphate can be added directly in the form of solid phosph...

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Abstract

The invention discloses a method for water treatment by utilizing graphene oxide-catalyzed ozone. The method comprises the steps of adding graphene oxide into an ozone reactor containing to-be-treated water, utilizing ozone to aerate the to-be-treated water where the graphene oxide is added, and maintaining a stirring and ozone aeration state in the water treatment process. The to-be-treated water can be water containing pollutants such as oxalic acid and deet. The pollutants are degraded by utilizing hydroxyl free radicals which have high oxidization capability and are generated by the ozone and the graphene oxide in the reaction process. Compared with activated carbon and carbon nano tubes, the method for water treatment by utilizing graphene oxide-catalyzed ozone has the advantages of being high in catalysis capability and quick in oxidization speed. Besides, the specific surface area of the graphene oxide is large, the raw materials are easy to obtain, and the ozone contains rich oxygen-containing groups and is good in dispersion effect in water and chemical modificability.

Description

【Technical field】 [0001] The invention relates to the field of water treatment, in particular to a water treatment method using ozone. 【Background technique】 [0002] As a green, strong oxidizing agent, ozone has been widely used in water treatment process. However, due to the selective oxidation characteristics of ozone and the low reaction rate with pollutants, it is limited in the field of water treatment. Advanced oxidation technology uses the non-selective strong oxidation ability of hydroxyl radicals to degrade organic matter. Currently advanced oxidation technologies include ozone oxidation, photochemical oxidation, catalytic wet oxidation, sonochemical oxidation, electrochemical oxidation, Fenton oxidation, etc. Ozone in water can directly oxidize organic matter by using ozone molecules, and can also indirectly oxidize organic matter by using hydroxyl radicals generated by ozone decomposition. These two reactions exist simultaneously in the aqueous solution system....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72B01J21/18
Inventor 吴乾元刘嘉南胡洪营李昂蔡亦忠
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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