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Nickel doped nanometer bismuth tungstate visible-light photocatalyst, and preparation and application thereof

A nano-tungsten and catalyst technology, applied in the field of environmental photocatalysis, can solve the problems of lack of independent intellectual property rights, difficult to obtain preparation raw materials, complicated preparation steps, etc., and achieve the effects of easy implementation, mild preparation conditions, and simple preparation steps.

Inactive Publication Date: 2017-05-10
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been reported abroad that some related metals (such as molybdenum, zirconium, copper, etc.) doped to improve Bi 2 WO 6 Cases of photocatalytic activity of materials, however, there are few domestic reports, especially the lack of accumulation of relevant independent intellectual property rights
At the same time, existing metal doped Bi 2 WO 6 The materials also have problems such as complicated preparation steps, difficult to obtain raw materials, and relatively high preparation costs.

Method used

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  • Nickel doped nanometer bismuth tungstate visible-light photocatalyst, and preparation and application thereof
  • Nickel doped nanometer bismuth tungstate visible-light photocatalyst, and preparation and application thereof
  • Nickel doped nanometer bismuth tungstate visible-light photocatalyst, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] One, a kind of nickel-doped nano bismuth tungstate (Ni-Bi 2 WO 6 ) The preparation method of visible light catalyst, concrete steps are as follows:

[0034] (1) 1mmol sodium tungstate (Na 2 WO 4 2H 2 O) dissolved in 45 mL of distilled water, sonicated (100W, 5 min) to obtain Na 2 WO 4 2H 2 O solution;

[0035] (2) Then 0.3mmol nickel chloride (NiCl 2 ·6H2 O) and 2 mmol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) add Na sequentially 2 WO 4 2H 2 O solution, sonication (100W, 5 min) to obtain a light green suspension, which is the precursor for the preparation of the target material.

[0036] (3) The precursor was transferred to a 100 mL high-temperature and high-pressure hydrothermal reactor with a polytetrafluoroethylene liner, and hydrothermally reacted at 180 °C for 12 h.

[0037] (4) After the reaction kettle was naturally cooled to room temperature, the resulting product was collected, washed 5 times with distilled water, centrifuged (3000r / min, 10min), and ...

Embodiment 2

[0045] In order to compare the effect of nickel-tungsten molar ratio (Ni / W) on the performance of nickel-doped nano-bismuth tungstate visible light catalysts, by changing the amount of nickel chloride added (ie 0, 0.1, 0.3, 1, 1.5mmol), and according to The steps in Example 1 were simultaneously prepared to obtain nickel-doped nano-bismuth tungstate visible light with undoped nickel (Ni / W=0) and nickel-tungsten molar ratios of 1:20, 3:20, 1:2, and 3:4, respectively. catalyst.

Embodiment 3

[0047] Ni-Bi 2 WO 6 Adsorption of organic dye (rhodamine B) by visible light catalyst and visible light catalytic degradation test, the specific steps are as follows:

[0048] Prepare 300 mL of rhodamine B solution (15 mg / L), and disperse 0.3 g of photocatalyst (Ni / W=0.15, ie 3:20) in the solution (so that the solubility of the prepared catalyst in the solution is 1 g / L) , the adsorption experiment was carried out under the condition of magnetic stirring (200r / min) in the dark, and the experiment time was 120min. Samples were taken every 10 min, passed through a 0.22 μm filter membrane, and the absorbance of the filtrate was detected at λ=554 nm with a TU-1810 / 1810S UV-visible spectrophotometer, and according to the standard working curve of rhodamine B solution ( figure 2 ) to find its concentration in the filtrate. Take time (t) as the abscissa, and the adsorption rate (the ratio of the concentration of rhodamine B in the filtrate to its initial concentration at a certai...

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Abstract

The invention belongs to the field of environmental photocatalysis research, and specifically discloses a nickel doped nanometer bismuth tungstate visible-light photocatalyst, and a preparation method and an application thereof. The nickel doped nanometer bismuth tungstate visible-light photocatalyst comprises nickel and tungsten with a mol ratio of 1: 20 to 1: 2. The preparation method comprises the following concrete steps: preparing a sodium tungstate aqueous solution, adding nickel chloride tetrahydrate and bismuth nitrate into the sodium tungstate aqueous solution, carrying out a reaction so as to form a precursor, transferring the precursor into a hydrothermal reactor with a polytetrafluoroethylene liner, then carrying out a reaction, and subjecting a reaction product to washing, centrifugation and drying so as to obtain a Ni-Bi2WO6 catalyst. The catalyst provided by the invention has good specific surface adsorption performance, and can realize highly-efficient catalytic degradation of organic dyes in water under visible light.

Description

technical field [0001] The invention relates to the technical field of environmental photocatalysis, in particular to a nickel-doped nano-bismuth tungstate visible light catalyst and its preparation method and application. Background technique [0002] With the continuous growth of my country's population and the acceleration of industrialization and urbanization, a large number of pollutants have entered natural water bodies (such as lakes, rivers and reservoirs, etc.), resulting in a sharp decline in water quality; various organic pollutants have been widely detected, serious Threat to the ecological environment and public water security. The removal and restoration of organic pollutants in water is imminent. [0003] Nanomaterials refer to any one-dimensional geometric size in the nanoscale (1-100 nm) material. Due to their structure and size characteristics, nanomaterials have excellent adsorption properties and photoelectric activity, and are an effective technical app...

Claims

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Application Information

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IPC IPC(8): B01J23/888C02F1/30
CPCC02F1/30B01J23/002B01J23/888C02F2101/308C02F2305/10B01J35/39
Inventor 向垒莫测辉陈雷余忠雄李彦文蔡全英李慧赵海明黄献培
Owner JINAN UNIVERSITY
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