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Hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material and application thereof

A silica, hydrated mesoporous technology, used in metal/metal oxide/metal hydroxide catalysts, oxidized water/sewage treatment, water pollutants, etc. High requirements for electrodes, etc., to achieve the effects of improving dispersibility and reactivity, increasing exposed active sites, and overcoming easy agglomeration and inactivation

Inactive Publication Date: 2021-03-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires harsh reaction conditions and high requirements on electrodes, which greatly limit the limitations of its use conditions
Ozone will produce some inert intermediates during the degradation process, which will affect the complete degradation of pollutants
The Fenton method also limits its application due to its narrow pH application range.
These degradation methods alone are not very good methods for removing tetrabromobisphenol A
At the same time, many methods are limited to the laboratory and cannot be applied to the actual remediation of contaminated sites or the remediation effect is very poor.

Method used

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  • Hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material and application thereof
  • Hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material and application thereof
  • Hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment provides a method for preparing a hydrated mesoporous silica-coated nano-iron-cobalt bimetallic composite, which specifically includes the following steps:

[0020] Step 1, 0.496g FeSO 4 ·7H 2 O and 0.502g CoSO 4 ·7H 2 O is dissolved in the mixed solution of 95mL water and ethanol, wherein the volume ratio of water and ethanol is (45-50): (50-45), stir to make it dissolve completely;

[0021] Step 2. Weigh 0.05g-0.06gNaBH 4 Dissolve in 50ml of deionized water and place in a three-necked flask. Will hold NaBH 4 The three-necked flask of solution was placed into the sonicator (50-70% power indication). Under the protection of nitrogen, add the mixed solution of step 1 dropwise to the solution at a rate of 3 mL / min, after the dropwise addition is completed. Continue to stir for 30-60 minutes, the solution turns black or dark brown, and obtains nano-iron-cobalt bimetallic suspension;

[0022] Step 3, continue to add 5mL NH to the three-necked flask ...

Embodiment example 2

[0033] This embodiment provides the method for removing tetrabromobisphenol A in groundwater by the iron-cobalt bimetallic composite coated with hydrated mesoporous silica obtained in embodiment 1, which specifically includes the following steps:

[0034] Step 1. Take five 100mL serum bottles and add 50ml tetrabromobisphenol A (10mg / L) solution respectively. Take out 4 serum bottles again and add the hydrogen peroxide of 20mmol / L, only stay the serum bottle that only contains 50ml tetrabromobisphenol A (10mg / L). The solutions in all 5 serum bottles were adjusted to pH=7.

[0035] Step 2. Weigh 1 g / mL of the iron-cobalt bimetallic composite coated with hydrated mesoporous silica obtained in Example 1 (containing 0.25 g / mL nano-iron-cobalt bimetal), 0.25 g / mL nano-iron-cobalt Bimetallic and 0.75 g / mL hydrated mesoporous silica, were added separately to serum bottles containing hydrogen peroxide. A serum bottle containing only tetrabromobisphenol A was used as a control. In ad...

Embodiment example 3

[0042] This example provides the iron-cobalt bimetallic composite material coated with hydrated mesoporous silica obtained in Example 1, and the cyclic degradation method. Specifically include the following steps:

[0043] Step 1. Carry out magnetic separation on the iron-cobalt bimetallic composite coated with hydrated mesoporous silica after the reaction in Example 2, wash with deionized water and absolute ethanol in turn, and obtain the composite after the reaction after repeated washing three times. Material;

[0044] Step 2. Add the composite material to a serum bottle containing 50ml TBBPA (10mg / L) and 20mmol / L hydrogen peroxide, and adjust the pH=7.

[0045] Step 3. Put the serum bottle in a constant temperature shaking incubator. During the reaction, at specified time intervals (0, 0.2, 0.5, 1, 2, 4, and 6 h), collect 1 mL of water samples (filtered with a 0.22 μm organic filter) and immediately quench the reaction with 0.5 μmL of tert-butanol .

[0046] Step 4, me...

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Abstract

The invention discloses a preparation method of a hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material. The preparation method comprises the following steps: 1, adding 0.496 g of ferric sulfate heptahydrate and 0.502 g of cobalt sulfate heptahydrate into a mixed solution of ethanol and water, and mechanically stirring until solid particles are dissolved; 2, dropwise adding a NaBH4 solution into the mixed solution at a speed of 1.5 ml / min, and continuously stirring for 30 minutes to obtain a nano zero-valent iron-cobalt bimetallic suspension; 3, continuing to add ammonia water and hexadecyl trimethyl ammonium bromide into the suspension, continuously stirring for 30 minutes, adding 1ml of tetraethyl orthosilicate, and stirring for 4 hours at a low speed (300rpm);and 4, separating a solid from a liquid by using a magnet, sequentially washing with deionized water and absolute ethyl alcohol for three times respectively, and finally drying in a drying oven for 12 hours, and obtaining a final product, namely the hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material. Through the action of the hydrated mesoporous silica coated nano iron-cobalt bimetal, the problems that the nano iron-cobalt bimetal is easy to agglomerate and inactivate and Co ions are easy to leach are solved, and the dispersity and reactivity of the nano iron-cobalt bimetal are improved. The hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material obtained by the method and hydrogen peroxide form a Fenton-like system which is used forremoving tetrabromobisphenol A in underground water. The method has a very strong remediation effect on the soil and underground water of the tetrabromobisphenol A contaminated site.

Description

technical field [0001] The invention belongs to the technical field of treatment of groundwater pollutants, and in particular relates to a hydrated mesoporous silica-wrapped nano-iron-cobalt bimetallic composite material and its application with hydrogen peroxide. Background technique [0002] Tetrabromobisphenol A (TBBPA) is a brominated flame retardant (BFR) that is widely used in our lives. Accounting for more than 60% of the BFRs market share. TBBPA is mainly used as a reactive flame retardant in circuit boards, plastics and chemicals, and the global market demand is very large. Due to the widespread use of TBBPA and the improper disposal of its waste by humans, a large amount of TBBPA has been released into the environment. TBBPA has been detected in various environmental media, such as soil, air, water environment, as well as in animals and humans. has become a ubiquitous pollutant. Studies have shown that TBBPA has thyroid hormone activity, estrogen activity and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J37/34B01J37/16B01J37/03C02F1/72C02F101/34C02F101/36C02F103/06
CPCB01J23/75B01J37/343B01J37/16B01J37/033C02F1/722C02F1/725C02F2101/345C02F2101/36C02F2103/06C02F2305/026B01J35/398B01J35/23
Inventor 李辉相明辉黄茂方王文兵黄渊
Owner SHANGHAI UNIV
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