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A kind of holmium sodium tungstate nanometer water treatment catalyst and preparation method thereof

A technology of sodium holmium tungstate and catalyst, which is applied in physical/chemical process catalysts, chemical instruments and methods, and reduced water/sewage treatment, etc. The effect of solving the problem of water pollution

Active Publication Date: 2022-06-24
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, wastewater containing dyes such as p-nitrophenol, methyl orange, and methylene blue is usually alkaline and has a large pH value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of ammonium metatungstate complex solution

[0026] Weigh 8.485g of ammonium metatungstate, 8.485g of citric acid monohydrate and 42.425g of deionized water, put them in a 50mL cylindrical open glass bottle, and uniformly dissolve them by ultrasonic vibration to form an ammonium metatungstate complex solution, which is for later use;

[0027] (2) Preparation of mixed solution of holmium chloride and sodium chloride

[0028] 5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water were weighed, placed in a 200mL polytetrafluoroethylene digestion tank, and uniformly dissolved by ultrasonic vibration to form a mixed solution of holmium chloride and sodium chloride, for use;

[0029] (3) Supercritical hydrothermal synthesis

[0030] The open glass bottle containing the complex solution of ammonium metatungstate in step (1) is placed in the polytetrafluoroethylene digestion tank in step (2), while ensuring that the mixed solution of ho...

Embodiment 2

[0034] (1) Preparation of ammonium metatungstate complex solution

[0035] Weigh 8.485g of ammonium metatungstate, 25.455g of citric acid monohydrate and 42.425g of deionized water, put them in a 50mL cylindrical open glass bottle, and uniformly dissolve them by ultrasonic vibration to form an ammonium metatungstate complex solution, which is for later use;

[0036] (2) Preparation of mixed solution of holmium chloride and sodium chloride

[0037] 5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water were weighed, placed in a 200mL polytetrafluoroethylene digestion tank, and uniformly dissolved by ultrasonic vibration to form a mixed solution of holmium chloride and sodium chloride, for use;

[0038] (3) Supercritical hydrothermal synthesis

[0039] The open glass bottle containing the complex solution of ammonium metatungstate in step (1) is placed in the polytetrafluoroethylene digestion tank in step (2), while ensuring that the mixed solution of h...

Embodiment 3

[0043] (1) Preparation of ammonium metatungstate complex solution

[0044] Weigh 8.485g of ammonium metatungstate, 20.000g of citric acid monohydrate and 42.425g of deionized water, put them in a 50mL cylindrical open glass bottle, and uniformly dissolve them by ultrasonic vibration to form an ammonium metatungstate complex solution, which is for later use;

[0045] (2) Preparation of mixed solution of holmium chloride and sodium chloride

[0046] 5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water were weighed, placed in a 200mL polytetrafluoroethylene digestion tank, and uniformly dissolved by ultrasonic vibration to form a mixed solution of holmium chloride and sodium chloride, for use;

[0047] (3) Supercritical hydrothermal synthesis

[0048] The open glass bottle containing the complex solution of ammonium metatungstate in step (1) is placed in the polytetrafluoroethylene digestion tank in step (2), while ensuring that the mixed solution of h...

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PUM

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Abstract

The invention discloses a nanometer water treatment catalyst of holmium sodium tungstate and a preparation method thereof. The method uses ammonium metatungstate, citric acid monohydrate, holmium chloride, sodium chloride and deionized water as raw materials, and utilizes supercritical water Prepare the sodium holmium tungstate catalyst by thermal synthesis. The catalyst of the present invention is environmentally friendly, low in cost, capable of efficiently catalytically reducing water body pollutants such as p-nitrophenol, methyl orange, and methylene blue, and has the advantages of long service life, simple regeneration, and the like, and has broad market application prospects.

Description

technical field [0001] The invention provides a holmium sodium tungstate nanometer water treatment catalyst and a preparation method thereof, belonging to the field of environmental protection catalysis and water pollution control. Background technique [0002] p-nitrophenol, methyl orange, methylene blue, etc. are commonly used dyes, and 10% to 20% of them are discharged into the water environment during their use, while the waste water containing p-nitrophenol, methyl orange, methylene blue and other dyes is toxic High, containing carcinogenic, mutagenic and teratogenic substances; high chroma, inhibiting photosynthesis of plants in aquatic systems: high COD value will lead to eutrophication of water. Based on the above hazards, wastewater containing dyes such as p-nitrophenol, methyl orange, and methylene blue is an urgent problem that needs to be dealt with in the current water treatment technology. Commonly used treatment methods include adsorption method, membrane sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30C02F1/70C02F101/30C02F101/34
CPCB01J23/30C02F1/70C02F2101/308C02F2101/345
Inventor 徐海涛金奇杰陆尧徐慕涛计雯钰李明波徐梦宋静
Owner NANJING TECH UNIV
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