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Sodium holmium tungstate nano water treatment catalyst and preparation method thereof

A technology of sodium holmium tungstate and catalyst, which is used in physical/chemical process catalysts, chemical instruments and methods, reduced water/sewage treatment, etc., can solve problems such as large changes in pH value, achieve low cost, improve catalyst activity, and excellent The effect of catalytic conversion

Active Publication Date: 2021-11-05
NANJING UNIV OF TECH +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, place them in a 50mL cylindrical open glass bottle, and dissolve them uniformly through ultrasonic oscillation to form a complex solution of ammonium metatungstate for later use;

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

[0028] Weigh 5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water, place them in a 200mL polytetrafluoroethylene digestion tank, and dissolve them uniformly by ultrasonic oscillation to form a mixed solution of holmium chloride and sodium chloride, which is set aside;

[0029] (3) Supercritical hydrothermal synthesis

[0030] The open glass bottle that ammonium metatungstate complex solution is housed in the step (1) is placed in the polytetrafluoroethylene digestion tank in the step (2), guarantee simultaneously th...

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, place them in a 50mL cylindrical open glass bottle, and dissolve them uniformly by ultrasonic oscillation to form an ammonium metatungstate complex solution for later use;

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

[0037] Weigh 5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water, place them in a 200mL polytetrafluoroethylene digestion tank, and dissolve them uniformly by ultrasonic oscillation to form a mixed solution of holmium chloride and sodium chloride, which is set aside;

[0038] (3) Supercritical hydrothermal synthesis

[0039] The open glass bottle that ammonium metatungstate complex solution is housed in the step (1) is placed in the polytetrafluoroethylene digestion tank in the step (2), guarantee simultaneously that the...

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, place them in a 50mL cylindrical open glass bottle, and dissolve them uniformly through ultrasonic oscillation to form a complex solution of ammonium metatungstate for later use;

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

[0046] Weigh 5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water, place them in a 200mL polytetrafluoroethylene digestion tank, and dissolve them uniformly by ultrasonic oscillation to form a mixed solution of holmium chloride and sodium chloride, which is set aside;

[0047] (3) Supercritical hydrothermal synthesis

[0048] The open glass bottle that ammonium metatungstate complex solution is housed in the step (1) is placed in the polytetrafluoroethylene digestion tank in the step (2), guarantee simultaneously t...

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PUM

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Abstract

The invention discloses a sodium holmium tungstate nano water treatment catalyst and a preparation method thereof. According to the method, with ammonium metatungstate, citric acid monohydrate, holmium chloride, sodium chloride and deionized water as raw materials, the holmium sodium tungstate catalyst is prepared through a supercritical hydrothermal synthesis method. The catalyst disclosed by the invention is environment-friendly and low in cost, can efficiently catalyze and reduce water pollutants such as p-nitrophenol, methyl orange and methylene blue, has the advantages of long service life, simplicity in regeneration and the like, and has a wide market application prospect.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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 UNIV OF TECH
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