A kind of preparation method of gold cluster/graphene composite catalytic membrane

A technology of graphene composite and gold clusters, which is applied in the field of catalytic membranes, can solve the problems such as difficult recovery of gold clusters, and achieve the effects of high catalytic activity, avoiding agglomeration, and easy recycling

Active Publication Date: 2021-01-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, gold clusters are difficult to recover from the reaction solution due to their ultra-small size

Method used

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  • A kind of preparation method of gold cluster/graphene composite catalytic membrane
  • A kind of preparation method of gold cluster/graphene composite catalytic membrane
  • A kind of preparation method of gold cluster/graphene composite catalytic membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 50 mg of graphene oxide into a beaker with an analytical balance, add 25 mL of deionized water and use the probe to ultrasonicate for 15 min to make it evenly dispersed to obtain mixed solution A, pour A into a polytetrafluoroethylene reactor and water at 180 ° C After heating for 5 h, the obtained rGO was rod-shaped. After freeze-drying, 5 mg of rGO was added to 10 mL of thiol ligand-protected gold cluster solution (1 mM) and 10 mL of ultrapure water. After sonication for 45 min, a uniformly dispersed mixture B was obtained. After the membrane, the excess material was washed with 150 mL of deionized water to form a homogeneous composite catalytic membrane. Using 0.2mM p-nitrophenol (4-NP) solution at a flow rate of 1mL / min for 2h to reach adsorption saturation, 0.5mM, 1.0mM and 1.5mM p-nitrophenol (4-NP) were degraded in turn. solution, the degradation effect is 100%, 100%, 100% respectively.

Embodiment 2

[0028] Weigh 50 mg of graphene oxide into a beaker with an analytical balance, add 25 mL of deionized water and use the probe to ultrasonicate for 15 min to make it evenly dispersed to obtain mixed solution A, pour A into a polytetrafluoroethylene reactor and water at 180 ° C After heating for 5 h, the obtained rGO was rod-shaped. After freeze-drying, 5 mg of rGO was added to 5 mL of thiol ligand-protected gold cluster solution (1 mM) and 15 mL of ultrapure water. After sonication for 45 min, a uniformly dispersed mixture B was obtained. After the membrane, the excess material was washed with 150 mL of deionized water to form a homogeneous composite catalytic membrane. The 0.2 mM p-nitrophenol (4-NP) solution was used to pass through the membrane for 2 h at a flow rate of 1 mL / min to reach adsorption saturation, and then the 0.5 mM, 1.0 mM and 1.5 mM 4-NP solutions were degraded in turn. The degradation effects were as follows: 100%, 96.1%, 62.1%.

Embodiment 3

[0030] Weigh 50 mg of graphene oxide into a beaker with an analytical balance, add 25 mL of deionized water and use the probe to ultrasonicate for 15 min to make it evenly dispersed to obtain mixed solution A, pour A into a polytetrafluoroethylene reactor and water at 180 ° C After heating for 5 h, the obtained rGO was rod-shaped. After freeze-drying, 5 mg of rGO was added with 20 mL of thiol ligand-protected gold cluster solution (1 mM). After sonication for 45 min, a uniformly dispersed mixed solution B was obtained. A homogeneous composite catalytic membrane is formed after the ionized water washes the excess material. The 0.2 mM p-nitrophenol (4-NP) solution was used to pass through the membrane for 2 h at a flow rate of 1 mL / min to reach adsorption saturation, and then 0.5 mM, 1.0 mM and 1.5 mM 4-NP were degraded in turn, and the degradation effects were 100 %, 100%, 100%.

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Abstract

The invention relates to a gold cluster / graphene compound catalytic membrane preparation method which comprises the steps: (1) adding deionized water into oxidized graphene to be dispersed evenly andultrasonically dispersing to obtain dispersion liquid; utilizing a hydrothermal reduction method to reduce the oxidized graphene into reduced oxidized graphene rGO and freeze drying to obtain rGO powder; (2) adding the rGO powder into a gold cluster solution protected by thiol ligand, then adding ultrapure water and ultrasonically dispersing to obtain mixed liquid; utilizing vacuum filtration to load the mixed liquid on a base membrane and washing to obtain a gold cluster / graphene compound catalytic membrane. The preparation method disclosed by the invention has the advantages of convenient technological operation, large gold cluster load amount, high catalytic activity, easiness in being recycled and utilized, ability in achieving high-efficiency catalytic membrane construction and good application prospect.

Description

technical field [0001] The invention belongs to the field of catalytic membranes, and particularly relates to a preparation method of a gold cluster / graphene composite catalytic membrane. Background technique [0002] Recent studies have shown that the catalytic separation membrane system integrates the catalytic process and the membrane separation process in the same processing unit, and has the advantages of fast mass transfer, easy scale-up, process control, and catalyst recyclability. In addition, some catalytic separation membranes also have functions such as selective supply of reactants, selective removal of reaction products, and acceleration of reaction kinetics. As the core of this system, high-efficiency membrane materials, which play a decisive role in catalysis and separation performance, have naturally received high attention in the field of catalytic separation membranes. However, it is still a challenge in the field of membrane technology to prepare a cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J23/52B01J35/06B01D71/02
CPCB01D71/021B01D71/022B01J23/52B01J31/226B01J35/0013B01J35/065
Inventor 刘艳彪刘翔杨胜楠李方沈忱思马春燕吴鹏姚劲宇许凯张晓冉
Owner DONGHUA UNIV
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