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A method for treating dye wastewater with a heterogeneous Fenton-like catalyst based on fe-beta molecular sieves

A fe-beta, dye wastewater technology, applied in the field of environmental engineering, can solve the problems of secondary pollution and low utilization rate, and achieve the effect of not easy to corrode equipment and good treatment effect

Active Publication Date: 2020-08-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional Fenton reaction exists H 2 o 2 Low utilization rate, secondary pollution and other problems, and strict requirements on the pH of the solution, the application has been greatly limited

Method used

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  • A method for treating dye wastewater with a heterogeneous Fenton-like catalyst based on fe-beta molecular sieves
  • A method for treating dye wastewater with a heterogeneous Fenton-like catalyst based on fe-beta molecular sieves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Catalyst preparation: Mix Beta molecular sieves with concentrated nitric acid at a mass ratio of 1:50, at a temperature of 80 ° Stirring and dealumination at C for 20 h, centrifugation and washing 8 times, 105 ° C drying for 2 h, then 150 ° C drying for 10 h to obtain dealuminated Beta molecular sieves. Mix 1 g dealuminated Beta molecular sieve with 621.43 mg ferrous acetate (containing 200 mg Fe), grind for 15 min, and ° C, Roasting in air atmosphere for 6 h, Fe-Beta molecular sieve can be obtained.

[0025] Catalyst treatment of dye wastewater: Take 100 mL of rhodamine B solution with a concentration of 100 mg / L in a conical flask, add 30 mg of Fe-Beta molecular sieve catalyst, adjust the pH of the solution to 3.0 with 1 mol / L HCl solution, Placed on a shaker with a rotation speed of 150r / min and oscillated for 30 min in the dark to achieve adsorption equilibrium. later at 70 ° Mix the dye solution, Fe-Beta molecular sieves, and 0.4 mL of H at C 2 o 2 The solut...

Embodiment 2

[0027] The difference between this example and Example 1 is that the amount of ferrous acetate used in the preparation of the catalyst is 310.71 mg (containing 100 mg Fe), and other steps, parameters and operations are the same as in Example 1. The decolorization rate of rhodamine B under this embodiment is 18.8%.

Embodiment 3

[0029] The difference between this example and Example 1 is that the amount of ferrous acetate used in the preparation of the catalyst is 1242.86 mg (including 400 mg Fe), and other steps, parameters and operations are the same as in Example 1. The decolorization rate of rhodamine B under this embodiment is 30.1%.

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Abstract

The invention relates to a method for treating dye wastewater by using a heterogeneous Fenton catalyst based on a Fe-Beta molecular sieve. In allusion to the defects that the conventional Fenton catalyst corrodes equipment easily, is difficult to separate and recycle, has a strict requirement on pH and the like, the invention provides a simple and convenient preparation method of a catalyst, and recycle of the catalyst can be achieved. The preparation method of the catalyst comprises the following steps: dealuminizing a Beta molecular sieve by using nitric acid, and immobilizing Fe on the dealuminized molecular sieves in a solid-state ion exchange way. The method for treating the dye wastewater by using the catalyst comprises the following steps: adding the Fe-Beta molecular sieve, a H2O2solution and a dye solution into a flask with a condensing reflux device, reacting under a magnetic stirring action, sampling at a set time point, and measuring absorbance by using a spectrophotometerto calculate the decolorization rate. The Fe-Beta molecular sieve used in the reaction can be reused as the catalyst after being centrifuged and activated.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating dye wastewater with a Fe-Beta molecular sieve-based heterogeneous Fenton-like catalyst, which belongs to the field of environmental engineering. Background technique [0002] Dye wastewater has the characteristics of high pollutant concentration, deep color, high toxicity, refractory degradation, anti-oxidation, anti-photolysis, and strong thermal stability. Improper discharge will seriously affect the growth of aquatic organisms and threaten human health. Therefore, dyes The comprehensive treatment of wastewater has become an urgent problem to be solved. [0003] At present, the processes commonly used in the industry for the treatment of dye wastewater include flocculation and sedimentation (air flotation), electrolysis, oxidation, adsorption, and biodegradation. The biodegradability of dye wastewater is low, and the biodegradation is difficult, requiring ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76C02F1/72C02F101/30
CPCB01J29/7615C02F1/722C02F1/725C02F2101/308
Inventor 张亚雷沈峥褚华强张唯
Owner TONGJI UNIV
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