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Natural sponge preparation method of gold/silver supported nanoparticle and application of gold/silver supported nanoparticle in catalyzing and degrading azobenzene pollutant

A silver nanoparticle and nanoparticle technology, which is applied in the field of water pollution treatment, can solve the problems of high cost and difficult regeneration, and achieve the effect of reducing the impact and being conducive to full utilization.

Inactive Publication Date: 2019-05-21
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that activated carbon is the best adsorbent for most dyes (including azo dyes), but its regeneration is difficult and costly

Method used

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  • Natural sponge preparation method of gold/silver supported nanoparticle and application of gold/silver supported nanoparticle in catalyzing and degrading azobenzene pollutant
  • Natural sponge preparation method of gold/silver supported nanoparticle and application of gold/silver supported nanoparticle in catalyzing and degrading azobenzene pollutant
  • Natural sponge preparation method of gold/silver supported nanoparticle and application of gold/silver supported nanoparticle in catalyzing and degrading azobenzene pollutant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The specific operation steps are as follows:

[0028] (1) Natural sponge pretreatment:

[0029] Take 10mg of natural sponge, pretreat it with 0.1M NaOH treatment solution at 60°C for 0h, 1h, 2h, 3h, 4h, 5h respectively, and wash it with ultrapure water 5 times directly after treatment.

[0030] (2) Preparation of silver nanoparticles:

[0031] Soak the above-mentioned pretreated natural sponge in 20ml, 3mM chloroauric acid solution or 20ml, 6mM silver nitrate solution, place it for 1 hour, and keep a constant temperature of 30°C. Then wash 3 times with ultrapure water to wash away unbound metal precursors, and place the sponge with chelated metal precursors in 0.1 mM sodium borohydride for 10 minutes under stirring to grow gold / silver on the sponge fibers nanoparticles. Afterwards, the sponge loaded with gold / silver nanoparticles was washed 5 times with ultrapure water, and set aside.

[0032] The effect diagram of this embodiment is as follows Figure 4 The result...

Embodiment 2

[0034] The specific operation steps are as follows:

[0035] (1) Natural sponge pretreatment:

[0036] Take 10 mg of natural sponge, pretreat with 0.01M, 0.1M, 0.2M NaOH treatment solution at 60°C for 4 hours, and wash with ultrapure water for 6 times directly after treatment.

[0037] (2) Preparation of silver nanoparticles:

[0038] Soak the above-mentioned natural sponge after 4 hours of pretreatment in 20ml, 3mM chloroauric acid solution or 20ml, 6mM silver nitrate solution, and place it for 1 hour, keeping a constant temperature of 30°C. Then wash 3 times with ultrapure water to wash away unbound metal precursors, and place the sponge with chelated metal precursors in 0.1 mM sodium borohydride solution for 10 minutes under stirring to grow gold and silver on the sponge fibers nanoparticles. Afterwards, the sponge loaded with gold and silver nanoparticles was washed 6 times with ultrapure water.

[0039] The effect diagram of this embodiment is as follows figure 2 wi...

Embodiment 3

[0041] The specific operation steps are as follows:

[0042] (1) Natural sponge pretreatment:

[0043] Take 10 mg of natural sponge, pretreat it with 0.1M NaOH treatment solution at 40°C, 60°C, and 80°C for 4 hours, and wash it with ultrapure water 5 times directly after treatment.

[0044] (2) Preparation of silver nanoparticles:

[0045] Soak the natural sponge after pretreatment for 4 hours in 20ml, 3mM chloroauric acid solution or 20ml, 6mM silver nitrate solution, place it for 1 hour, and keep a constant temperature of 30°C. Then wash 3 times with ultrapure water to wash away unbound metal precursors, and place the sponge with chelated metal precursors in 0.1 mM sodium borohydride for 10 minutes under stirring to grow gold and silver nanoparticles on the sponge fibers. particles. Afterwards, the sponge loaded with gold and silver nanoparticles was washed 5 times with ultrapure water.

[0046] This example discusses the effect of NaOH treatment temperature on the growt...

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Abstract

The invention discloses a natural sponge preparation method of gold / silver supported nanoparticles and application of the gold / silver supported nanoparticles in catalyzing and degrading azobenzene pollutants. Natural sponge is firstly subjected to pretreatment and hydrolysis of an alkali, then tissue scales on the surface of a sponge fiber can be removed, nanoparticle supporting and catalysis properties can be stabilized, gold or silver nanoparticles are supported under an appropriate condition, a novel injection-extrusion reaction mode is adopted to form a sponge composite material with supported nanoparticles as a deformable reaction container with a catalysis function, a continuous flow reaction system can be also filled with the sponge composite material, then continuous catalysis conversion of reactants can be achieved, and efficient catalytic degradation of azobenzene pollutants in a water environment can be achieved.

Description

technical field [0001] The invention relates to the field of water pollution treatment, in particular to a method for preparing a natural sponge loaded with gold and silver nanoparticles and its application in catalytic degradation of azobenzene pollutants. Background technique [0002] Azo dyes are the most numerous types of synthetic dyes, including acid, mordant, reactive, cationic, neutral, and disperse dyes. It accounts for 80% of the total organic dye products. The color spectrum is complete. Most azo dyes are formed by coupling aromatic amines with phenols, aromatic amines, and active methylene compounds after diazotization. After absorption, the structure of DNA is changed through the activation of the human body, causing human lesions and inducing cancer. Its chemical properties are relatively stable, and the wastewater components are complex, so azo dye wastewater is recognized as a high-concentration organic wastewater that is difficult to treat. [0003] Ther...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J35/10B01J37/02C02F1/58C02F101/38
Inventor 苏荣欣张泽张景辉刘朝辉刘明月黄仁亮齐崴
Owner TIANJIN UNIV