Load type solid catalyst for heterogeneous phase Fenton system and application thereof in water treatment

A solid catalyst, supported technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of decreased treatment efficiency, reduced catalytic performance, and ineffective production of active intermediates.

Inactive Publication Date: 2011-05-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, the heterogeneous Fenton system cannot effectively generate reactive intermediates, resulting in a decrease in the efficiency of the process
In addition, iron loss that may occur during processing can also reduce its catalytic performance
[0013] So far, the field

Method used

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  • Load type solid catalyst for heterogeneous phase Fenton system and application thereof in water treatment
  • Load type solid catalyst for heterogeneous phase Fenton system and application thereof in water treatment
  • Load type solid catalyst for heterogeneous phase Fenton system and application thereof in water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The aqueous solution used in this example is deionized water in which 100 ppm phenol is dissolved.

[0062] see figure 1 Describe the water treatment process. Put 20ml of the above-mentioned phenol solution and 2mg supported Au (1.5wt%, dAu: 3.5nm) / TiO 2 Catalyst (British London World Gold Association provides), this reactor is put into the condenser 2 that stirs continuously with magnetic stirrer 3, and wherein the rotating speed of magnetic stirrer is 400 rev / mins, and reaction condition is pH=6.8, T= 70° C.; then, intermittently add 1 ml of hydrogen peroxide solution (30% by weight, Sigma-Aldrich Company, St. Louis, U.S.) to the reactor through the glass stopper 4, and the time intervals are 0, 10 minutes, 20 minutes, 30 minutes, respectively. minutes and 50 minutes, the reaction time is 60-120 minutes; during the test, the degradation rate of phenol is about 30% in 10 minutes, about 40% in 30 minutes, and about 45% in 60 minutes; The instrument used for the dete...

Embodiment 2

[0064] The conditions used in this example are the same as those in Example 1 except that the usage amount of the supported catalyst is increased from 2.0 mg to 10.0 mg. With the increase of the amount of catalyst used, the degradation rate of phenol decreased from about 90% to about 31% when the reaction time was 60 minutes. This may be due to the increase in free radical scavenging rate caused by the decomposition of free radicals (hydroxyl radicals) into hydroxide ions by the catalyst. Therefore, as the amount of catalyst increases, the free radicals capable of oxidizing phenol will decrease, resulting in a decrease in the degradation rate of phenol.

Embodiment 3

[0066] The conditions of this example are the same as Example 1 except for two additional temperature values ​​of 25°C and 40°C. The result is as image 3 shown. The reaction time was 60 minutes, and when the temperature rose from 25°C to 40°C until reaching 70°C, the conversion rates of hydrogen peroxide were 27%, 35% and 45%, respectively. Therefore, increasing the temperature is beneficial to increase the conversion rate of hydrogen peroxide, so that the free radicals that can be used to oxidize phenol increase, thereby increasing the degradation rate of phenol. Using Au (2.4% by weight) / Hap as a catalyst under the same temperature (298K, 313K, 343K) has done another temperature test, the results are as follows Figure 4 Shown: the reaction time is 120 minutes, the conversion rate of phenol is 50% at 298K; the conversion rate of phenol is 70% at 313K; and its conversion rate is 83% at 343K. Therefore, it can be seen that the reaction speeds up significantly with increasi...

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Abstract

The invention relates to a load type solid catalyst for a heterogeneous phase Fenton system and an application thereof in water treatment. The load type solid catalyst for the heterogeneous phase Fenton system comprises an active ingredient aurum and a carrier, wherein the aurum is loaded on the carrier or in the carrier. The invention also provides a water treatment method.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environment, and relates to a catalyst for degrading organic matter in water. Specifically, the invention relates to a loaded solid catalyst for a heterogeneous Fenton system and its application in water treatment. Background technique [0002] Organic compounds can have toxic effects on the human body and other organisms, so it is of great significance to the treatment of water containing organic pollutants such as formaldehyde, phenol and alcohol. In today's society, due to climate change and environmental pollution, the frequency and duration of droughts are increasing, resulting in relatively scarce water resources. Therefore, improving domestic and industrial water supply is a global issue. [0003] However, currently only a few treatment processes such as general wet oxidation, homogeneous catalytic oxidation, heterogeneous catalytic oxidation, biological oxidation, supercritical oxida...

Claims

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Application Information

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IPC IPC(8): B01J27/18B01J23/89B01J23/66C02F1/72
Inventor 韩一帆徐晶赵一扬李平
Owner EAST CHINA UNIV OF SCI & TECH
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