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Reduced graphene oxide supported nano Fe3O4/Mn3O4 composite and preparation and application thereof

A composite material and graphene technology, applied in the direction of oxidized water/sewage treatment, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve the problem of high catalyst consumption, long reaction time, difficult to remove, etc. problem, to achieve the effect of fast reaction rate, low equipment requirements and low cost

Inactive Publication Date: 2017-01-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional homogeneous Fenton reaction, there are high catalyst dosage, long reaction time, Fe 2+ It is difficult to remove in solution, and Fe 2+ / Fe 3+ Easy to form complexes with intermediate products, such as precipitation

Method used

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  • Reduced graphene oxide supported nano Fe3O4/Mn3O4 composite and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Synthesis of Nano-Mn by Polyhydric Alcohol Forced Hydrolysis 3 o 4 The steps of granulation are as follows: put 3.06g of manganese acetate tetrahydrate, 10ml of deionized water, and 125ml of diethylene glycol in a four-neck flask, mechanically stir vigorously, 500rpm / min, and heat with a heating mantle at the same time, 6°C / min , heated to 100°C for 30 minutes. Centrifuge after the reaction, wash with absolute ethanol and then centrifuge again, finally wash with deionized water and then centrifuge. The obtained product was placed in an oven at 50°C for 48 hours to obtain nanometer Mn 3 o 4 particles.

[0039] Preparation of Graphene Oxide-supported Nano-Fe by Massart Hydrolysis Method in Co-precipitation Method 3 o 4 / Mn 3 o 4 Composite material: Weigh 0.0232g graphene oxide in 50ml deionized water for more than 2h (power ≥ 300W); weigh 0.399g Fe 2 (SO 4 ) 3 and 0.278g FeSO 4 ·7H 2 O was dissolved in 50ml of water to prepare a solution with a molar ratio of...

Embodiment 2

[0045] Nano-Fe supported on reduced graphene oxide 3 o 4 / Mn 3 o 4 The preparation method of the composite material is the same as in Example 1.

[0046] Using reduced graphene oxide to support nano-Fe3 o 4 / Mn 3 o 4 The composite material is a catalyst for the treatment of sulfamethazine wastewater. The initial concentration of sulfamethazine in the wastewater is 20mg / L, pH=2.5, and 0.5g / L reduced graphene oxide is added to support nano-Fe 3 o 4 / Mn 3 o 4 Composite material and 25uL H 2 o 2 , the reactor was placed in a constant temperature oscillator with a rotation speed of 160 rpm and a temperature of 35°C.

[0047] Detection method: with embodiment 1.

[0048] The results showed that after 120min of reaction, the reduced graphene oxide loaded nano-Fe 3 o 4 / Mn 3 o 4 The composite material is a catalyst, the conversion rate of degrading sulfamethazine is 96%, and the removal rate of TOC is 47%.

Embodiment 3

[0050] Nano-Fe supported on reduced graphene oxide 3 o 4 / Mn 3 o 4 The preparation method of the composite material is the same as in Example 1.

[0051] Using reduced graphene oxide to support nano-Fe 3 o 4 / Mn 3 o 4 The composite material is a catalyst for the treatment of sulfamethazine wastewater. The initial concentration of sulfamethazine in the wastewater is 20 mg / L, the pH is adjusted to 3, and 1 g / L reduced graphene oxide is added to support nano-Fe 3 o 4 / Mn 3 o 4 Composite and 25 μL HO 2 o 2 , the reactor was placed in a constant temperature oscillator with a rotation speed of 160 rpm and a temperature of 35°C.

[0052] Detection method: with embodiment 1.

[0053] The results show that reduced graphene oxide loaded nano-Fe 3 o 4 / Mn 3 o 4 The composite material can quickly and effectively remove sulfamethazine in wastewater, and the conversion rate of sulfamethazine reaches 100% after 40 minutes of reaction.

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Abstract

The invention discloses a reduced graphene oxide supported nano Fe3O4 / Mn3O4 composite and preparation and application thereof and belongs to the field of material preparation and environmental technology. In the composite, a mass ratio of reduced graphene oxide to Fe3O4 / Mn3O4 is (1:20) to (1:1), and a mass ratio of Fe3O4 to Mn3O4 is (1:3) to (3:1). A preparation method comprises the steps of preparing nano Mn3O4 particles by means of polyol forced hydrolysis, preparing graphene oxide supported nano Fe3O4 / Mn3O4 composite by using Massart hydrolysis among co-precipitation methods with graphene oxide as a support, and reducing with hydrazine hydrate to obtain the reduced graphene oxide supported nano Fe3O4 / Mn3O4 composite.

Description

technical field [0001] The invention belongs to the field of material preparation and environmental technology, in particular to a reducing graphene oxide loaded nano-Fe 3 o 4 / Mn 3 o 4 Composite materials and their preparation and applications. Background technique [0002] There are a wide variety of refractory toxic organic pollutants in wastewater. These pollutants are bioaccumulative, difficult to biodegrade, and exist stably in water bodies with low content. Conventional wastewater treatment processes (chemical sludge method, flocculation, Precipitation, etc.) cannot effectively remove such pollutants. Studies have shown that such pollutants generally exist in the secondary effluent of sewage treatment plants, surface water, and even drinking water source water, which poses potential dangers to human health. [0003] At present, the methods for dealing with such pollutants include physical methods and chemical methods. The adsorption method in the physical method ...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/72C02F101/38
CPCC02F1/725B01J23/8892C02F2101/40B01J35/33
Inventor 王建龙万众
Owner TSINGHUA UNIV
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