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Catalyst for activating persulfate and application of catalyzing persulfate to remove pollutants

A technology for activating persulfate and persulfate, which is applied in the field of environmental pollutant treatment, can solve problems such as the scope of leakage, the presence of heavy metals, and insufficient stability, and achieve friendly and convenient preparation conditions, fast generation rate, and easy separation and recycling. Effect

Active Publication Date: 2022-04-15
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a safe, high-efficiency and stable catalyst for the problems of insufficient stability, low activity, low efficiency, great influence on water quality, high cost, heavy metal leakage risk and limited scope of application of the existing Fenton catalyst. Low-cost, wide-applicable solid catalyst for activating persulfate and its application in catalytic persulfate removal of pollutants

Method used

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  • Catalyst for activating persulfate and application of catalyzing persulfate to remove pollutants
  • Catalyst for activating persulfate and application of catalyzing persulfate to remove pollutants
  • Catalyst for activating persulfate and application of catalyzing persulfate to remove pollutants

Examples

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Effect test

Embodiment 1

[0048] This example mainly demonstrates the removal of typical organic pollutants in water by this method. Benzoic acid has stable chemical properties and is a representative of highly stable organic pollutants, and its degradation effect can reflect the efficiency of oxidation technology. In a drinking water treatment process that uses surface water as the water source, the initial concentration of benzoic acid in the filtered water to be treated is 2.0 mg / L, the pH of the solution is 7.3, and the water temperature is 20°C.

[0049] The catalyst used in this example is prepared according to the following method: (1) Put 100g of quartz sand (particle size 2~5mm) into 1L of water, and stir rapidly to fully wet; 2) At 25°C, use hydrochloric acid to adjust the pH of the water to 1.0, then add 10g copper sulfate, 40g ferrous sulfate and 200g calcium chloride, mix well, and react for 12 hours; (3) add 40g sodium hydroxide, the pH of the system is 10 at this time, at 25°C at 60-80r ...

Embodiment 2

[0056] The preparation method and application thereof of a kind of persulfate catalyst of the present embodiment are basically the same as embodiment 1, except that:

[0057] 1. The treatment object of this example is industrial wastewater, containing 20 mg / L chlorophenol, pH 9.2, and water temperature 25°C;

[0058] 2. When preparing the catalyst, the carrier used is granular activated carbon (Shanxi Xinhua coal-based activated carbon, particle size 1~2cm), the copper salt used is copper chloride, the iron salt used is ferric chloride, and the alkali used is hydroxide Calcium, other with embodiment 1;

[0059] 3. When the catalyst is applied, the dosage of potassium persulfate is 100mg / L, and the dosage of catalyst is 1g / L.

[0060] The processing effect of this embodiment can be found in figure 2 , it can be seen that the present embodiment can remove more than 90% of chlorophenols in a certain industrial wastewater within 30 minutes, and the effect is obvious. Among the...

Embodiment 3

[0062] The preparation method and application thereof of a kind of persulfate catalyst of the present embodiment are basically the same as embodiment 1, except that:

[0063] 1. The treatment object of this embodiment is groundwater, containing 1.5 mg / L trichlorethylene, pH 7.4, and water temperature 16°C;

[0064] 2. When preparing the catalyst, the carrier used is zeolite (particle size 2 ~ 4mm), no iron salt is used, and the others are the same as in Example 1;

[0065] 3. When the catalyst is applied, the dosage of potassium persulfate is 30mg / L, and the dosage of catalyst is 1.5g / L.

[0066] The processing effect of this embodiment can be found in image 3 , it can be seen that the present embodiment almost completely removes trichlorethylene in groundwater within 10 minutes. Wherein, the zeolite-supported catalyst in this embodiment can be reused many times.

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Abstract

The invention discloses a catalyst for activating persulfate and the application of catalyzing persulfate to remove pollutants. The solid catalyst is prepared through the following steps: (1) completely immerse the carrier in water, stir to make it fully wet to obtain a slurry; (2) add metal salts to the slurry, the metal salts include copper salts, and mix thoroughly Evenly, control the pH below 3 and impregnate to load the metal ions on the carrier; (3) Add alkaline substances to the mixed system in step (2) to control the pH of the system above 7, and stir and react at 10~40℃ for 30~ After 240 minutes, the solid was separated; (4) the solid was washed with water with a pH of 7~14; (5) the solid obtained in step (4) was dried below 100°C or dried naturally to obtain activated persulfate solid catalyst. The catalyst is used to catalyze persulfate to remove pollutants, can catalyze persulfate to efficiently generate strong oxidizing free radicals, and has the characteristics of safety, high efficiency, stability and wide application.

Description

technical field [0001] The invention relates to the technical field of environmental pollutant treatment, in particular to a catalyst for activating persulfate and its application in catalyzing persulfate to remove pollutants. Background technique [0002] Humans pollute the environment through the discharge of domestic sewage and industrial wastewater, solid waste and landfill leachate leakage, environmental emergencies, etc. through production activities, and cause drinking water sources, rainwater, groundwater, river water, reclaimed water, etc. through the global hydrological cycle. The widespread pollution of environmental media such as lake water, seawater, and soil poses a threat to ecological security and human health. It is urgent to develop safe, efficient, and stable treatment technologies to reduce pollution from sources such as sewage, wastewater, solid waste, and landfill leachate. Effective control of organic pollutants, effective removal of pollutants in surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/138B01J29/04C02F1/72B09C1/08C02F101/34C02F101/36C02F101/38
CPCC02F1/725B01J27/138B01J29/044B09C1/08C02F2101/34C02F2101/36C02F2101/345C02F2101/40C02F2101/38
Inventor 李旭春杨家辉吕欣吴永亨余可儿
Owner ZHEJIANG GONGSHANG UNIVERSITY
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