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Catalyst for activating persulfate and application of catalyst in catalysis of persulfate for contaminant removal

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

Active Publication Date: 2019-03-29
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 catalyst in catalysis of persulfate for contaminant removal
  • Catalyst for activating persulfate and application of catalyst in catalysis of persulfate for contaminant removal
  • Catalyst for activating persulfate and application of catalyst in catalysis of persulfate for contaminant removal

Examples

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Embodiment 1

[0048] This example mainly proves that this method can remove typical organic pollutants from water. Benzoic acid has stable chemical properties and is a representative of highly stable organic pollutants. Its degradation effect can reflect the effectiveness of oxidation technology. In a drinking water treatment process using surface water as the source of water, 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 was prepared according to the following method: (1) Put 100g of quartz sand (with a particle size of 2~5mm) into 1L of water, and stir quickly to fully wet it; 2) Under 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 25℃ at 60-80r The react...

Embodiment 2

[0056] The preparation method and application of a persulfate catalyst in this embodiment are basically the same as those in embodiment 1, except that:

[0057] 1. The treatment object of this embodiment is industrial wastewater, containing 20 mg / L of chlorophenol, pH of 9.2, and water temperature of 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, the others are the same as in Example 1;

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

[0060] For the processing effect of this embodiment, see figure 2 It can be seen that this embodiment can remove more than 90% of chlorophenols in a certain industrial wastewater within 30 minutes, and the effect is obvious. Among them, the activate...

Embodiment 3

[0062] The preparation method and application of a persulfate catalyst in this embodiment are basically the same as those in embodiment 1, except that:

[0063] 1. The treatment object of this embodiment is groundwater, containing 1.5 mg / L trichloroethylene, 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 others are the same as in Example 1;

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

[0066] For the processing effect of this embodiment, see image 3 It can be seen that this embodiment almost completely removes trichloroethylene in groundwater within 10 minutes. Among them, 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 application of the catalyst in catalysis of persulfate for contaminant removal. The solid catalyst is prepared by using the following steps: (1) immersing a carrier in water completely, performing stirring so as to wet the carrier sufficiently and obtain slurry; (2) adding a metal salt including a copper salt to the slurry, performing thorough and even mixing, controlling the pH value at 3 or below, and performing impregnation so as to load metal ions onto the carrier; (3) adding an alkaline substance to the mixed system obtainedin the step (2) so as to control the pH value of the system at 7 or above, performing stirring for a reaction at 10-40 DEG C for 30-240 minutes, and separating the solid; (4) washing the solid with water at a pH value of 7-14; and (5) performing drying or natural airing on the solid obtained in the step (4) at 100 DEG C or below so as to obtain the solid catalyst for activating persulfate. The catalyst can be applied to catalysis of persulfate for contaminant removal, high-oxidbility free radicals can be generated by the catalyzed persulfate, and the catalyst has the advantages of safety, high efficiency, stability and wide application.

Description

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

Claims

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Application Information

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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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