Preparation and application of a novel and efficient heterogeneous fenton catalyst fe3o4@edta

A catalyst, edta-2na technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve problems such as unsatisfactory catalytic activity

Active Publication Date: 2017-08-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although zero-valent iron has high catalytic activity under acidic pH conditions, the corresponding iron release can reach 20 mg / L, which is much higher than the limit value of 0.3 mg / L in the "Environmental Quality Standards for Surface Water (GB 3838-2002)", Goethite has similar disadvantages
Fe 3 o 4 It can efficiently catalyze the oxidation of organic substances such as phenol and aniline under neutral pH conditions, but the catalytic activity for more difficult-to-degrade polychlorophenols, dyes, endocrine disruptors, etc. is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Fe 3 O 4 Preparation of @EDTA catalysts. Formulation of FeCl 2 and FeCl 3 50mL of solution in which FeCl 2 and FeCl 3 The concentrations were 0.4mol / L and 0.8mol / L, respectively, and a certain amount of concentrated hydrochloric acid was added to inhibit Fe 2+ oxidation; prepare 0.9mol / L NH 3 ·H 2 O solution 400mL; drop the above iron salt mixed solution into NH at a rate of 1mL / min 3 ·H 2 O solution, stir and pass nitrogen to ensure that the reaction is in an oxygen-free state, continue to stir for 20 min after the reaction; separate the precipitate, wash and dry to obtain Fe 3 O 4 Magnetic nanoparticles. A certain amount of Fe 3 O 4 The powder was ultrasonically dispersed in ultrapure water, heated in a 70°C water bath for 1 hour, and stirred; a certain amount of EDTA-2Na aqueous solution was added dropwise to it, and continued stirring for 2 hours to make the reaction sufficient; the precipitate was separated, washed and dried to obtain Magnetic Fe 3 O...

Embodiment 2

[0016] The experiments compared the heterogeneous Fenton method of different catalysts, adding Fe alone 3 O 4 @EDTA and join H alone 2 O 2 Removal rate of dimethyl phthalate in three ways.

[0017] catalyst and H 2 O 2 In the combined multiphase Fenton experiment, a beaker covered with aluminum foil and protected from light was used as the reactor, and the treatment conditions were that the concentration of the wastewater containing dimethyl phthalate was 10 mg / L, and the initial pH was 5.5 (the pH was not adjusted during the reaction process. ), add 1g / L catalyst and 0.1mol / L H into the reactor at the same time 2 O 2 , stirred vigorously at room temperature.

[0018] Add Fe alone 3 O 4 In the @EDTA experiment, 1 g / L Fe was added to the reactor 3 O 4 @EDTA, other conditions as above.

[0019] Add H alone 2 O 2 In the experiment, 0.1mol / L H was added to the reactor 2 O 2 , other conditions are the same as above.

[0020] Wastewater treatment time is 10h.

[00...

example 3

[0024] Add 1g / L 10% Fe to 10mg / L dimethyl phthalate solution 3 o 4 @EDTA, initial pH 5.5 (pH is not adjusted during the reaction), the processing time and detection method are the same as Example 2, when H 2 o 2 When the concentration is 0.1mol / L, 0.5mol / L, 1mol / L, the removal rate of dimethyl phthalate is 89.6%, 94.6%, 87.7%, respectively. The above results show that the H 2 o 2 When the concentration reaches 0.1mol / L, Fe 3 o 4 @EDTA means high catalytic efficiency.

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Abstract

Aiming at the problems of iron release and low catalytic efficiency in iron-based heterogeneous Fenton catalysts, the invention discloses the preparation and application of a novel and efficient heterogeneous Fenton catalyst Fe3O4@EDTA, which belongs to the technical field of environmental protection. The Fe3O4 precursor was first prepared by the chemical co-precipitation method, and the magnetic Fe3O4@EDTA catalyst with stable performance and nanoscale was obtained through surface modification. In the presence of hydrogen peroxide, Fe3O4@EDTA can efficiently catalyze the removal of refractory organic pollutants such as dimethyl phthalate in water. The invention has simple equipment, convenient operation, easy-to-obtain reagents, can efficiently remove endocrine disruptors in waste water, and has great application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of a heterogeneous Fenton catalyst Fe3O4@EDTA and research on its use in catalyzing the removal of endocrine disruptors in water. Background technique [0002] Advanced oxidation technology is a kind of chemical oxidation technology. It uses the non-selective strong oxidant (hydroxyl radical) generated by the reaction to remove and mineralize refractory organic matter and improve the biodegradability of organic matter in water. Among them, by Fe 2+ and H 2 O 2 The formed Fenton reaction has been gradually applied to the treatment of dye wastewater, agricultural wastewater, landfill leachate, etc. But this reaction needs to adjust the pH to be around 3, and H 2 O 2 Due to the large dosage, the catalyst cannot be reused, and the accompanying production of iron sludge, etc., limits the wide application of the Fenton reaction. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28C02F1/72
Inventor 王东升何洁杨晓芳虞红波
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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