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Bowl-shaped porous hollow nanoparticle, and preparation method, using method and regeneration method thereof

A hollow nano-particle technology, applied in nano-materials and their application fields, can solve the problems of few cycles of use, high regeneration difficulty, low removal efficiency, etc., and achieve the effects of high adsorption capacity, fast adsorption rate, and reduced dosage

Active Publication Date: 2019-09-06
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the application of the present invention provides a bowl-shaped porous hollow nanoparticle and its preparation, use and regeneration method, which solves the problem that the existing nanoparticle is used in the removal of organic dyes due to the large amount of use and the removal of organic dyes. Technical problems such as low efficiency, high difficulty in regeneration, and low number of cycles

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  • Bowl-shaped porous hollow nanoparticle, and preparation method, using method and regeneration method thereof
  • Bowl-shaped porous hollow nanoparticle, and preparation method, using method and regeneration method thereof
  • Bowl-shaped porous hollow nanoparticle, and preparation method, using method and regeneration method thereof

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Embodiment 1

[0067] This embodiment provides a method for preparing bowl-shaped porous hollow nanoparticles, comprising the following steps:

[0068] 1. Mix ammonia water (concentration: 25%), absolute ethanol and deionized water with a volume ratio of 1:20:80 for 1 hour;

[0069] 2. Put tetraethyl orthosilicate into the solution in step 1 with a volume ratio of 100:1, and stir for 30 minutes;

[0070] 3. Configure dopamine hydrochloride-deionized aqueous solution with a mass-volume ratio of 1:20, and then put it into the solution prepared in step 2 with a volume ratio of 1:12. After stirring for 24 hours, transfer it to a hydrothermal kettle in a polytetrafluoroethylene inner village Medium, hydrothermal treatment at 140°C for 24h;

[0071] 4. Wash the product of step 3 with water and ethanol several times, add hydrofluoric acid to etch for 2 hours, wash with water 3 to 4 times, and finally disperse in water.

[0072] Scanning electron microscope and transmission electron microscope wer...

Embodiment 2

[0074] The difference from Example 1 is that the hydrothermal temperature in Step 3 is 180°C. It can be calculated from the adsorption-desorption curve that its specific surface area is 100.1 m 2 / g, the pore size is basically distributed between 2nm and 20 nm.

Embodiment 3

[0076] The difference from Example 1 is that the etching time in Step 4 is 3 hours. It can be calculated from the adsorption-desorption curve that its specific surface area is 115.8 m 2 / g, the pore size is basically distributed between 2nm and 20 nm.

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Abstract

The invention provides a bowl-shaped porous hollow nanoparticle and a preparation method thereof. A mixed solution of nano-silica and a deionized water solution of dopamine hydrochloride is hydrothermally treated, and the obtained material is etched with hydrofluoric acid to obtain the bowl-shaped nanoparticle with a hollow topography, uniform particle and a dispersed mesoporous structure. The particles has a specific surface area of 100-120 m<2> / g and a mesoporous aperture of 2-20 nm, and is chemically stable in a pH range of 1-10. The invention also provides a method using the nanoparticleto adsorb organic dyes, and a regeneration method of the nanoparticle. The nanoparticle is independently introduced into a single organic dye or mixed organic dye solution at a small dosage, and thencan complete the adsorption within 20 s without a reducing agent. The regeneration conditions are mild and the nanoparticle can be repeatedly used for 13 times or more. Compared with nanoparticles inthe prior art, the nanoparticle of the invention has the advantages of small dosage, high removal efficiency, low regeneration difficulty and high recycling frequency value.

Description

technical field [0001] The application of the present invention relates to the technical field of nanomaterials and their applications, in particular to a bowl-shaped porous hollow nanoparticle and its preparation, use and regeneration methods. Background technique [0002] Wastewater discharged from the paper industry, leather industry, pharmaceutical industry, and textile industry, etc., contains a large amount of organic dyes, such as methylene blue (MB), malachite green (MGO), methyl violet (MV), etc. Its high toxicity, chemical stability and carcinogenicity have caused serious harm to human health and other organisms. Among the currently available methods, the adsorption method has been widely concerned because of its advantages of low cost, good treatment effect and simple operation. The existing adsorbents used for the treatment of organic dye wastewater include activated carbon materials, zeolites, mesoporous materials, and functionalized nanomaterials, etc., but mo...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/26B01J20/30B01J20/34
CPCB01J20/262B01J20/28021B01J20/28061B01J20/28083B01J20/3085B01J20/3425B01J20/3475
Inventor 阎斌林佳友向淋王桂华吴江陈胜顾迎春
Owner SICHUAN UNIV