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Preparation method and application of NiO hollow nanospheres

A nanosphere and hollow technology, applied in nanotechnology, instruments, measuring devices, etc., can solve the problems of cumbersome steps, too many uncontrollable factors in the middle, and complexity, and achieve the effect of increasing specific surface area, low cost, and simple method

Active Publication Date: 2021-02-12
HEIHE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]The purpose of the present invention is to aim at the prior art that the synthesis method of the current multi-stage hollow structure usually involves complex template routes, cumbersome steps, too many intermediate uncontrollable factors, etc. Insufficiency, provide a kind of application biomass pectin as carbon source and soft template, at room temperature, pectin and nickel acetate undergoes self-crosslinking reaction and subsequent sintering steps, prepared by nano-particles assembly particle size approx. NiO hollow nanospheres of 40-60nm

Method used

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  • Preparation method and application of NiO hollow nanospheres
  • Preparation method and application of NiO hollow nanospheres
  • Preparation method and application of NiO hollow nanospheres

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Embodiment 1

[0040] At room temperature, 0.3 g of pectin was dissolved in 100 mL of water and vigorously stirred for 10 h, then 0.3 wt % pectin solution was added dropwise into 1 wt % nickel acetate solution while stirring continuously.

[0041]When nickel ions meet the pectin microspheres, they are immediately adsorbed to the surface of the pectin spheres, forming gel microspheres composed of adsorbed nickel ions. These gel microspheres were centrifuged and washed with water to remove excess salt, then freeze-dried in a freeze dryer for 36 hours.

[0042] Dry the sample in N 2 Carbonization at 600°C for 2h under atmosphere, and finally firing in a fiber furnace at 400°C for 4h to obtain NiO hollow nanospheres. The hollow nanosphere is a nanosphere with a multi-level structure, and the nanosphere is constructed of nanoparticles. The diameter of the nanosphere is about 40-60nm, see Figure 1~2 .

[0043] figure 1 It is the XRD pattern of the sample powder after sintering at 400°C for 4 ...

Embodiment 2

[0045] S1: Preparation of nickel ion gel microspheres: The relative molecular weight of pectin is about 25,000. Under room temperature, dissolve pectin in water and stir vigorously for 5 hours to prepare it into a 0.1wt% pectin solution, and add it drop by drop Adding 5wt% nickel acetate solution, stirring continuously at the same time, after the dropwise addition, the solution is centrifuged, washed with water to remove excess salt, and freeze-dried;

[0046] S2: Preparation of NiO hollow nanospheres: nickel ion gel microspheres in N 2 Carbonization under the atmosphere, the carbonization temperature is 550°C, and the carbonization time is 4h; finally, it is fired in a fiber furnace, the firing temperature is 450°C, and the firing time is 3h.

Embodiment 3

[0048] S1: Preparation of nickel ion gel microspheres: The relative molecular weight of pectin is about 30,000. Under room temperature, dissolve pectin in water and stir vigorously for 10 hours to prepare a 1wt% pectin solution, and add it dropwise 1wt% nickel acetate solution, while constantly stirring, after the dropwise addition, the solution was centrifuged, washed with water to remove excess salt, and freeze-dried;

[0049] S2: Preparation of NiO hollow nanospheres: nickel ion gel microspheres in N 2 Carbonization under the atmosphere, the carbonization temperature is 650℃, the carbonization time is 2h; finally it is roasted in the fiber furnace, the roasting temperature is 350℃, the roasting time is 5h.

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Abstract

The invention discloses a preparation method of NiO hollow nanospheres, which comprises the following steps: by using biomass pectin as a soft template, carrying out self-crosslinking reaction with nickel acetate, and carrying out subsequent sintering to prepare the NiO hollow nanospheres with the particle size of about 40-60nm, which are assembled by nanoparticles. The material is stable in structure, excellent in H2S gas sensitivity and low in working temperature, the 50ppmsensitivity of the material is 175.9, and the H2S gas sensitivity is far superior to that of reported H2S gas sensors.

Description

technical field [0001] The invention belongs to the field of gas sensors, and in particular relates to a NiO hollow nanosphere, a preparation method and an application thereof, in particular to a NiO hollow nanosphere with a multi-level structure in H 2 S sensor applications. Background technique [0002] h 2 S is a poisonous, dangerous and flammable gas with a distinct smell of rotten eggs. It usually occurs in poorly ventilated closed places such as basements, sewers, and manholes; it may also exist in crude oil, natural gas, and hot springs; in addition, H 2 S is also a by-product of more than 70 industries and manufacturing industries such as petroleum refining, kraft paper mills, coal gasifiers, and waste management. It is released when sulfur-containing organic compounds and proteins are broken down by microorganisms. In addition, H 2 S can enter the human body through breathing, and interact with disulfide bonds (-S-S-) in oxidases, proteins, and amino acids in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04B82Y40/00G01N27/12
CPCC01G53/04B82Y40/00G01N27/127C01P2004/34C01P2004/64C01P2002/72C01P2004/04
Inventor 刘立红杨铭历亳孙晶陈利强朱明霞
Owner HEIHE UNIV
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