Small bell type Fe3O4 nano-reactor, and preparation and application of nano-reactor

A nano-reactor and bell-shaped technology, which is applied in the field of preparation of bell-shaped nano-reactors, can solve the problems of poor stability and low catalytic activity, and achieve the effect of avoiding agglomeration and enhancing stability

Inactive Publication Date: 2017-09-22
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low catalytic activity and poor stability of existing heterogeneous Fenton catalysts, and to provide a method that can limit the Fenton-like reaction in a specific nanometer space, thereby efficiently catalytic oxidation to remove chlorine Bell-Type Fe of Phenolic Organic Pollutants 3 o 4 Nanoreactor and its preparation and application

Method used

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  • Small bell type Fe3O4 nano-reactor, and preparation and application of nano-reactor
  • Small bell type Fe3O4 nano-reactor, and preparation and application of nano-reactor
  • Small bell type Fe3O4 nano-reactor, and preparation and application of nano-reactor

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: bell type Fe of the present invention 3 o 4 Preparation method of nanoreactor

[0025] The core-shell provided by the present invention is Fe 3 o 4 Fe 3 o 4 @Fe 3 o 4 / C, the synthesis schematic is as follows figure 1 As shown, its specific preparation method can be divided into the following four steps:

[0026] (1) Preparation of Fe 3 o 4 Magnetic particles: 2.60g FeCl 3 ·6H 2 O. Dissolve 1.35g of sodium citrate and 4.80g of sodium acetate in 80mL of ethylene glycol, and magnetically stir at room temperature for half an hour. The obtained yellow mixed solution was immediately transferred into a closed polytetrafluoroethylene-lined stainless steel high-temperature and high-pressure reactor, and heated to 200° C. in a muffle furnace for 10 hours of reaction. After the reaction, the black product was magnetically separated, washed three times with ethanol and deionized water, and dried in vacuum for 12 hours to obtain Fe 3 o 4 Magnetic partic...

Embodiment 2

[0030] Embodiment 2: bell type Fe of the present invention 3 o 4 Structural Characterization of Nanoreactors

[0031] For the Fe prepared in Example 1 3 o 4 The structure of the nanoreactor was characterized as follows:

[0032] (1) Morphological characterization

[0033] The as-prepared Fe was observed by transmission electron microscopy (TEM) 3 o 4 , Fe 3 o 4 @SiO 2 , Fe 3 o 4 @SiO 2 @Fe 3 o 4 / C and bell type Fe 3 o 4 @Fe 3 o 4 / C nanoreactor morphology, the results are as figure 2 shown. Fe 3 o 4 The particle size is uniform, the edge is slightly rough, and the average particle size is about 200nm. After coating with a layer of silica gel with a thickness of about 40nm, it presents an obvious core-shell structure, and the edges become smoother. in H 2 o 2 Under the action of ferrocene and ferrocene, a special double-layer shell structure grows on the surface of the silica gel shell, which consists of Fe in the inner ring 3 o 4 layer and the carb...

Embodiment 3

[0039] Embodiment 3: adopt heterogeneous phase Fenton treatment method to remove 4-chlorophenol in the aqueous solution

[0040] Fe 3 o 4 Magnetic particles, Fe 3 o 4 @Fe 3 o 4 The preparation process of / C reactor is with example 1. In this example, 4-chlorophenol is used as a representative organic pollutant to investigate Fe 3 o 4 @Fe 3 o 4 / C reactor catalytic decomposition of H 2 o 2 Ability to oxidize 4-chlorophenol.

[0041] The degradation experiment was carried out in a 50mL Erlenmeyer flask, and Fe 3 o 4 @Fe 3 o 4 / C catalyst (final concentration is 0.5g / L in waste water volume, under the same condition with Fe 3 o 4 magnetic particles as a control), and then add mass concentration of 30% H 2 o 2 (The final concentration is 20mM in terms of waste water volume) to activate the catalytic degradation reaction, and take out part of the reaction solution to measure the concentration of 4-chlorophenol at regular intervals. The reaction flask was placed ...

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Abstract

The invention discloses a small bell type Fe3O4 nano-reactor, and preparation and application of the nano-reactor. The reactor takes Fe3O4 particles as a core, the surface of the core is coated with a silica gel layer by a Stober method to form a Fe3O4@SiO2 compound, the surface of the Fe3O4@SiO2 compound reacts in acetone by the aid of dicyclopentadienyl iron and H2O2 to form a Fe3O4 / C shell, a Fe3O4@SiO2@Fe3O4 / C compound is obtained, and finally, the silica gel layer is removed by ammonia water to obtain the small bell type Fe3O4 nano-reactor. Compared with a traditional heterogeneous Fenton catalyst, the small bell type structure effectively avoids catalyst agglomeration, and stability of the Fenton catalyst is enhanced.

Description

(1) Technical field [0001] The invention relates to the field of material preparation and environmental technology, in particular to a core and shell parts made of Fe 3 o 4 The preparation method and application of the bell-shaped nanoreactor composed of the present invention. (2) Background technology [0002] Advanced oxidation technology is an effective method to remove refractory toxic and harmful organic substances in the environment. Among them, the widely used Fenton reaction utilizes ferrous ions (Fe 2+ ) and H 2 o 2 The role produces a strong oxidizing hydroxyl radical (OH), which oxidizes and degrades organic pollutants almost non-selectively. Due to the advantages of high oxidation efficiency, easy operation, and low cost, Fenton oxidation technology plays an important role in the treatment of various wastewater such as dye wastewater, pharmaceutical wastewater, papermaking wastewater, and pesticide wastewater. In recent years, heterogeneous Fenton-like reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/08B01J35/10B01J37/03B01J37/08C02F1/72C02F101/34C02F101/36
CPCC02F1/722C02F1/725B01J23/745B01J37/0018B01J37/031B01J37/033B01J37/08C02F2305/026C02F2101/36C02F2101/345B01J35/393B01J35/30B01J35/23B01J35/397B01J35/33B01J35/51B01J35/633
Inventor 曾滔俞明东张海燕何志桥宋爽
Owner ZHEJIANG UNIV OF TECH
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