A kind of preparation method and application of iron-loaded molecular sieve type Fenton-like catalyst

A technology of molecular sieve and catalyst, which is applied in the field of preparation of iron-carrying molecular sieve-type Fenton-like catalyst and its pretreatment of nitrobenzene wastewater, can solve the problems of increasing treatment equipment and costs, achieve low treatment cost, broaden the scope of PH application, The effect of simple process

Active Publication Date: 2015-08-19
浙江灵泽环保科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional Fenton reaction needs to stabilize the pH at about 3, so a large amount of acid is required for acidification before the reaction, and a large amount of Fe(OH) will be produced during neutralization after the reaction 3 Precipitation requires additional processing equipment and costs

Method used

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  • A kind of preparation method and application of iron-loaded molecular sieve type Fenton-like catalyst
  • A kind of preparation method and application of iron-loaded molecular sieve type Fenton-like catalyst
  • A kind of preparation method and application of iron-loaded molecular sieve type Fenton-like catalyst

Examples

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Effect test

Embodiment 1

[0026] Embodiment 1: a kind of preparation method of 3A-Fe type molecular sieve class Fenton catalyst, this method comprises the following steps:

[0027] In the first step, under vigorous stirring, the Na 2 CO 3 Add powder slowly to 2.5g / L FeSO 4 In the solution, maintain the molar ratio of sodium ions to iron ions at 1:1 (mol / mo1), and continue to stir with a stirrer at a speed of 500r / min for 1h to obtain Na 2 CO 3 and FeSO 4 mixed system.

[0028] In the second step, the 3A molecular sieve is activated by calcination at a high temperature of 400° C. for 1 hour, cooled at room temperature, and stored in a desiccator for future use.

[0029] In the third step, the activated 3A molecular sieve powder is put into the above Na 2 CO 3 and FeSO 4 In the mixing system, and at room temperature (18~25°C), continue stirring with a stirrer at a speed of 100r / min for 5h to obtain a mixed material. The mixture was suction-filtered to obtain a precipitate, washed three times wit...

Embodiment 2

[0032] Example 2: At room temperature, when degrading 500mL concentration of 600mg / L nitrobenzene, the addition of 3A-Fe type molecular sieve catalyst is 0.5g, H 2 o 2 The addition amount of the method is 3mL, the pH value of the reaction is 10, the degradation rate of nitrobenzene is over 90% in 120min, and the removal rate of CODcr is over 78.6%.

[0033] Pour 500mL of nitrobenzene wastewater with a concentration of 600mg / L into a 1L beaker, place it on a magnetic stirrer, add 0.5g of the 3A-Fe molecular sieve catalyst prepared by the method in Example 1, and adjust the pH to 10 with HCl or NaOH , turn on the constant temperature magnetic stirrer, make it fully mixed, and then add 3mL H 2 o 2 solution to form a heterogeneous Fenton-like catalytic oxidation wastewater treatment system, and use this as the start time of the reaction, the reaction time is 120min, and samples are taken at different reaction time intervals within 120min, and the nitro For the concentration of ...

Embodiment 3

[0034] Embodiment 3: Degradation 500mL concentration is the nitrobenzene solution of 100mg / L, the addition of the 3A-Fe type molecular sieve catalyst that adopts the method for embodiment 1 to prepare is 0.5g, H 2 o 2The addition amount of nitrobenzene is 2.5mL, and the pH value of the reaction is under the conditions of 2, 4, 6, 8, and 10 respectively. After 120 minutes of reaction, the degradation rates of nitrobenzene are 91.7%, 94.1%, 87.3%, 88.4%, and 95.1%. For details, see the attached Figure 5 . This shows that the heterogeneous Fenton reaction with 3A-Fe molecular sieve as a catalyst can produce high degradation efficiency of p-nitrobenzene pollutants between pH 2-10, breaking through the limitation of the pH applicable range of the traditional Fenton reaction being acidic .

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Abstract

The invention discloses a preparation method of an iron carrying molecular sieve fenton-like catalyst and application of the catalyst prepared by the method in a nitrobenzene waste water treatment system. According to the preparation method, a 3A molecular sieve is taken as a carrier, ferrous sulfate is taken as a precursor, and a 3A-Fe molecular sieve is prepared through the technical parameters of control of the high temperature calcinations temperature of the 3A molecular sieve, the reaction addition amount of Na2CO3 and FeSO4 and the like. A heterogeneous fenton-like catalytic oxidation waste water treatment system comprises the 3A-Fe molecular sieve and hydrogen peroxide so as to process the nitrobenzene waste water to remove and mineralize the nitrobenzene waste water efficiently. The fenton-like catalyst can be recycled and separated from the waste water after being used for processing the waste water; the heterogeneous fenton-like waste water treatment system can well operate under acid and alkaline conditions, the pH value does not need to be regulated, no chemical sludge is generated in the system, and the processing cost is low; and the technology process is simple and easy to control, and has good practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials and wastewater treatment, and in particular relates to the preparation of an iron-carrying molecular sieve type Fenton-like catalyst and a method for pretreating nitrobenzene wastewater. Background technique [0002] Most of the wastewater in pharmaceutical and chemical enterprises is high-concentration toxic and harmful wastewater. Due to the complexity and harmfulness of its water quality, it has always been one of the most difficult wastewater in the field of industrial water treatment, causing great pressure on energy conservation and emission reduction for enterprises. Nitrobenzene wastewater is a relatively representative industrial wastewater, which has been included in the blacklist of priority pollutants in water by my country. The waste water is highly toxic and refractory to biodegradability. When it is discharged into the water body, it will seriously deterio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76C02F1/72
Inventor 蒋胜韬白书立管玉江王三秀祝建中
Owner 浙江灵泽环保科技有限公司
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