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Preparation method of novel gold nanoparticle-modified silicon dioxide nanosheet catalyst

A technology of gold nanoparticles and silica, which is applied in the field of preparation of new gold nanoparticles modified silica nanosheet catalysts, can solve the problems of particle size, high dispersion and stability that are not easy to achieve, and avoid the risk of toxicity , high catalytic efficiency, and high structural self-regulation

Pending Publication Date: 2017-05-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite the successful synthesis of supported gold catalysts, it is still not easy to achieve uniform particle size, high dispersion, and stability during the repeated use of AuNPs in supports or heat treatment, which may be affected by the catalytic activity of AuNPs.

Method used

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  • Preparation method of novel gold nanoparticle-modified silicon dioxide nanosheet catalyst
  • Preparation method of novel gold nanoparticle-modified silicon dioxide nanosheet catalyst
  • Preparation method of novel gold nanoparticle-modified silicon dioxide nanosheet catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Preparation of SiO 2 Nanosheets. Specifically include the following steps:

[0038] Step 1.1: Deposit 500 nm thick SiO on a single side polished Si(001) 4 inch diameter wafer by magnetron sputtering 2 film;

[0039] Step 1.2: For convenience, cut the silicon wafer with a 500 nm thick silicon dioxide layer into 2 x 2 cm pieces;

[0040] Step 1.3: Immerse the silicon wafer in NaBH in a 20 mL capacity Teflon-lined steel autoclave 4 solution (0.10g / ml, 3ml), and incubated at 75°C for 6 hours;

[0041] Step 1.4: Sonicate the resulting solution for 1 min and centrifuge to collect SiO in the solution 2 Nanosheet sample; after testing, the ultrasonic treatment time can reach the goal within 0.1-2 minutes.

[0042] Step 1.5: The collected samples were rinsed and dried under vacuum at room temperature to obtain SiO 2 Nanosheets.

[0043] Step 2: Prepare AuNPs colloidal solution. Specifically include the following steps:

[0044] Step 2.1: Obtain solution I by st...

Embodiment 2

[0053] Similar to Example 1, the difference is that the mass percentages of tetrachloroauric acid aqueous solution and trisodium citrate in steps 2.1 and 2.2 of Example 1 are changed to 0.5wt%, and other conditions remain the same.

Embodiment 3

[0055] Similar to Example 1, the difference is that the heating temperature in step 2.3 of Example 1 is changed to 70° C., and other conditions remain the same.

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Abstract

The invention discloses a preparation method of a novel gold nanoparticle-modified silicon dioxide nanosheet catalyst. The preparation method comprises the following steps: (1) weighing a SiO2 nanosheet and a AuNPs colloidal solution, and putting the SiO2 nanosheet into the AuNPs colloidal solution to obtain a mixed solution; (2) oscillating the mixed solution obtained in the step (1) at room temperature for 0.5 to 1 hour, and carrying out centrifugal collection to obtain AuNPs-modified SiO2 nanosheet catalyst. The preparation method of the novel gold nanoparticle-modified silicon dioxide nanosheet catalyst is simple and controllable in preparation process; no surfactant is used, so that the toxicity risk caused by the surfactant is avoided. The prepared catalyst can be applied to various catalysis processes, has the characteristics of high load rate, high catalysis efficiency and structural self-adjustability, and can bear thermal treatment.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a preparation method of a novel gold nanoparticle-modified silica nanosheet catalyst. Background technique [0002] With the ever-increasing demand for regulations on the protection of human health and the planet's environment, the invention and development of green chemical processes has become a key topic in industrial manufacturing, which needs to be produced in a sustainable, safe, energy-saving manner and produces no or only Very little scrap. Nanocatalysts play an important role in the implementation of green chemistry and have become one of the most attractive and exciting fields from nanoscience to nanotechnology. The specific nanofeatures of nanocatalysts open up a wide range of possibilities to control reactions with tunable chemical activity, specificity, and selectivity. Since the report by Haruta et al., well-defined AuNPs have been identified as excelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/02B01J35/00
CPCB01J23/52B01J35/00B01J35/30B01J35/40
Inventor 吉庆敏孙姣刘新邦
Owner NANJING UNIV OF SCI & TECH