Gold cluster/graphene compound catalytic membrane preparation method

A graphene composite, gold cluster technology, applied in the field of catalytic membrane, can solve the problem of difficult recovery of gold clusters, and achieve the effect of high catalytic activity, large loading, and avoiding agglomeration

Active Publication Date: 2018-08-17
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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  • Gold cluster/graphene compound catalytic membrane preparation method
  • Gold cluster/graphene compound catalytic membrane preparation method
  • Gold cluster/graphene compound catalytic membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 50mg of graphene oxide into a beaker with an analytical balance, add 25mL of deionized water and use a probe to ultrasonically disperse it for 15 minutes to obtain a mixed solution A. Pour A into a polytetrafluoroethylene reactor at 180°C. After heating for 5 hours, the obtained rGO was in the form of rods. 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 ultrasonication for 45 min, a uniformly dispersed mixture B was obtained. After the membrane was washed with 150mL deionized water to form a homogeneous composite catalytic membrane. Use 0.2mM p-nitrophenol (4-NP) solution to pass through the membrane at a flow rate of 1mL / min for 2h to reach adsorption saturation, and then degrade 0.5mM, 1.0mM, and 1.5mM p-nitrophenol (4-NP) in turn. Solution, degradation effect are 100%, 100%, 100% respectively.

Embodiment 2

[0028] Weigh 50mg of graphene oxide into a beaker with an analytical balance, add 25mL of deionized water and use a probe to ultrasonically disperse it for 15 minutes to obtain a mixed solution A. Pour A into a polytetrafluoroethylene reactor at 180°C. After heating for 5 hours, the obtained rGO was in the form of rods. After freeze-drying, take 5 mg of rGO, add 5 mL of thiol ligand-protected gold cluster solution (1 mM) and 15 mL of ultrapure water, and obtain a uniformly dispersed mixture B after ultrasonication for 45 min. After the membrane was washed with 150mL deionized water to form a homogeneous composite catalytic membrane. Use 0.2mM p-nitrophenol (4-NP) solution to pass through the membrane at a flow rate of 1mL / min for 2h to reach adsorption saturation, and then degrade 0.5mM, 1.0mM, and 1.5mM 4-NP solutions in turn, and the degradation effects are respectively 100%, 96.1%, 62.1%.

Embodiment 3

[0030] Weigh 50mg of graphene oxide into a beaker with an analytical balance, add 25mL of deionized water and use a probe to ultrasonically disperse it for 15 minutes to obtain a mixed solution A. Pour A into a polytetrafluoroethylene reactor at 180°C. After heating for 5 hours, the obtained rGO was in the form of a rod. After freeze-drying, take 5 mg of rGO and add 20 mL of thiol ligand-protected gold cluster solution (1 mM). After ultrasonication for 45 min, a uniformly dispersed mixture B was obtained. After pumping B, use 150 mL to remove A homogeneous composite catalytic membrane is formed after washing excess substances with ion water. Use 0.2mM p-nitrophenol (4-NP) solution to pass through the membrane at a flow rate of 1mL / min for 2h to reach adsorption saturation, and then degrade 0.5mM, 1.0mM, and 1.5mM 4-NP in sequence, and the degradation effects are 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, in particular to a method for preparing a gold cluster / graphene composite catalytic membrane. Background technique [0002] Studies in recent years 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, controllable process and recyclable catalyst. In addition, some catalytic separation membranes also have the functions of selectively providing reactants, selectively removing reaction products, and accelerating reaction kinetics. As the core of this system, high-efficiency membrane materials that play a decisive role in catalytic and separation performance have naturally received high attention in the field of catalytic separation membranes. However, at this stage, it is still a challenge in the field of membrane technology to prepare ...

Claims

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Application Information

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Patent Type & Authority Applications(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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