Au-Ag nanometer core-shell material taking carrageenan as reducing agent as well as preparation method and application thereof

A nano-core-shell, reducing agent technology, applied in the field of catalytic materials and bio-enzyme research, can solve problems such as the inability to meet the needs of multi-functional materials

Active Publication Date: 2020-07-07
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the deepening of technical research on nano-level materials in the field of science and technology in our country, nano-materials synthesized by only one precious metal can no longer meet people's needs for multi-functional materials.

Method used

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  • Au-Ag nanometer core-shell material taking carrageenan as reducing agent as well as preparation method and application thereof
  • Au-Ag nanometer core-shell material taking carrageenan as reducing agent as well as preparation method and application thereof
  • Au-Ag nanometer core-shell material taking carrageenan as reducing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 0.5g of carrageenan powder in 100mL of secondary water, heat and stir for 1h. Take 10 mL of the above solution and add 20 μL, 50 μL, and 100 μL of 0.02M chloroauric acid solution and 50 μL of 0.01M sodium hydroxide solution respectively, shake well, place in an electric blast drying oven, and react at 60°C for 12 hours. Cool to room temperature after reaction finishes, the result is as follows figure 1 shown.

[0029] figure 1 It was shown that the optimal addition amount of chloroauric acid was 50 μL, and the gold sol obtained was purple without precipitation, and the effect was the best. The gold sol prepared under this condition was labeled as AuNPs.

Embodiment 2

[0031] Dissolve 0.5g of carrageenan powder in 100mL of secondary water, heat and stir for 1h. Take 10 mL of the above solution and add 50 μL of 0.02M chloroauric acid solution and 50 μL of 0.01M sodium hydroxide solution into three parts, shake well, place in an electric blast drying oven, and react at 40°C, 60°C, and 80°C respectively 12h. Cool to room temperature after reaction finishes, the result is as follows figure 2 shown.

[0032] figure 2 It shows that the optimum reaction temperature is 60°C, and the obtained gold sol is purple without precipitation, and the effect is the best.

Embodiment 3

[0034] Dissolve 0.5g of carrageenan powder in 100mL of secondary water, heat and stir for 1h. Take 10 mL of the above solution, add 50 μL of 0.02M chloroauric acid solution and 50 μL of 0.01M sodium hydroxide solution, shake well, place in an electric blast drying oven, and react at 60°C for 12 hours. After the reaction, cool to room temperature, then prepare 1ml of gold sol prepared above, different volumes of 0.02M silver nitrate solution, 200μL of 0.01M sodium hydroxide solution, and secondary water to make a solution with a volume of 2ml, shake well, and place in In an electric blast drying oven, react at 80° C. for 2 h to obtain an orange Au-Ag nano core-shell material.

[0035] Regulating raw materials during the synthesis of Au-Ag (HAuCl 4 :AgNO 3 ) with a volume ratio of (a) 1:1 (b) 1:2 (c) 1:4 (d) 1:8 (e) 1:10 to obtain different Au-Ag nano core-shell materials. Add 1mL of the above-mentioned Au-Ag nano-core-shell materials with different raw material volume ratios...

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Abstract

The invention discloses an Au-Ag nanometer core-shell material taking carrageenan as reducing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a chloroauric acid solution and an alkaline solution into a carrageenan aqueous solution, shaking well, reacting at 40 to 80 DEG C, cooling to room temperature after the reaction toobtain an orange solution, namely gold sol; and adding a certain amount of silver nitrate solution and an alkaline solution into the gold sol, shaking well and reacting at 80 DEG C to obtain the Au-Agnanometer core-shell material. The Au-Ag nanometer core-shell material comprises a nano-gold core body and a nano-silver shell layer, wherein the average particle size of the nano-gold core body is 10+ / -5 nm, and the average particle size of the nano-silver shell layer is 30+ / -5 nm. The Au-Ag nanometer core-shell material can serve as a compound similar to catalase for detecting hydrogen peroxideso as to prevent food from being oxidized or remove the hydrogen peroxide from the food. The Au-Ag nanometer core-shell material can develop color by itself, does not need to add a developer in the process of detecting the hydrogen peroxide and is mild in detection condition and simple in detection method.

Description

technical field [0001] The invention relates to a method for preparing a metal nanometer material, in particular to a method for preparing an Au-Ag nanometer core-shell material by using carrageenan as a reducing agent, and belongs to the research field of catalytic materials and biological enzymes. Background technique [0002] As we all know, biological enzyme is a polymer substance with good selectivity and high biocatalytic activity. Enzymes in organisms are mainly composed of proteins, so their activity will be denatured and inactivated by other molecules and the surrounding environment (such as pH, temperature, electromagnetic waves, etc.), and are often affected by storage, transportation, etc. limits. These factors limit the application range of biological enzymes. Therefore, people have been devoting themselves to researching bioenzyme-like enzymes that can have similar catalytic properties to biological enzymes. The artificially synthesized biological enzymes ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00B82Y30/00G01N21/78B01J23/52B01J23/50B01J37/16
CPCB22F9/24B82Y40/00B82Y30/00G01N21/78B01J23/52B01J23/50B01J35/0013B01J35/0073B01J37/16B22F1/17
Inventor 王应霞于颖刘传飞俞立东李军
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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