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Near-normal-temperature thermosensitive catalyst and preparation method thereof

A catalyst and warming technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as complex components, high wastewater COD, complex operation, etc., and achieve simple and operable effects

Pending Publication Date: 2021-04-20
NANCHANG CAMPUS OF JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dye wastewater has a wide range of water quality and quantity, complex components, high concentration, and deep color, which make it more difficult to treat dye wastewater.
In general, the treatment of organic wastewater mainly has the following difficulties: high COD, difficult to degrade; high COD in wastewater, low BOD / COD, generally between 0.2 and 0.4, biochemical and difficult to biochemical
[0004] The methods commonly used to treat organic wastewater include: photodegradation, physical degradation, electrochemical degradation and biodegradation, but there are still many shortcomings such as low degradation rate, complicated operation and expensive price.

Method used

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  • Near-normal-temperature thermosensitive catalyst and preparation method thereof
  • Near-normal-temperature thermosensitive catalyst and preparation method thereof
  • Near-normal-temperature thermosensitive catalyst and preparation method thereof

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preparation example Construction

[0029] The preparation method of the present invention comprises the following steps:

[0030] Step 1. Preparation of carrier BiOCl:

[0031] Dissolve 1-1.2 mol of bismuth nitrate in deionized water and keep stirring, then add 2-2.4 mol of sodium sulfide into it, mix well, adjust the pH value of the solution to 7.0-7.5, stir and sonicate, then keep the temperature at 80 ℃, heated to reflux, washed and dried twice after the solution was cooled;

[0032] Step 2. Preparation of carrier BiOCl / Ag 3 PO 4 :

[0033] Add 1 to 1.2 mol of silver nitrate to the solution obtained in step 1, and keep stirring to dissolve it, then add 1 to 1.3 mol of disodium hydrogen phosphate solution dropwise to obtain a precipitate; keep the precipitate at a certain temperature for several hours, After cooling, wash with ultrapure water and ethanol three times respectively;

[0034] Step 3. Preparation of BiOCl / Ag 3 PO 4 / FeS 2 :

[0035] Add 5.6 to 6.1 mol of ferrous chloride and 2.2 to 2.5 mo...

Embodiment 1

[0037] Weigh the initial reactant 1mol of bismuth nitrate in deionized water in sequence according to the recipe and keep stirring, then add 5 drops of 0.1mol / L hydrochloric acid to adjust the pH of the mixed solution to 7.0, stir and sonicate for 4h, and heat to reflux for 12h. Then add 1mol silver nitrate in the solution and keep stirring to dissolve it, then add 1mol disodium hydrogen phosphate solution dropwise to obtain BiOCl / Ag 3 PO 4 , Transfer the precipitate to a polytetrafluoroethylene hydrothermal reactor and keep it at 140°C for several hours. Again, add 1.1 mol of ferrous chloride and 1.1 mol of elemental sulfur to the solution in sequence, then add 3 drops of 0.1 mol / L ammonia water to adjust the pH value of the solution to 7.0, conduct a hydrothermal reaction at 130°C for 12 hours, and wait for cooling Wash with deionized water and ethanol three times each, and then dry at 60 °C for 10 h to obtain BiOCl / Ag 3 PO 4 / FeS 2 powder.

Embodiment 2

[0039] Weigh the initial reactant 1.1mol bismuth nitrate in deionized water in turn according to the recipe and keep stirring, then add 4 drops of 0.1mol / L hydrochloric acid to adjust the pH of the mixed solution to 7.2, stir and sonicate for 3h, and heat to reflux for 12h. Then add 1.1mol silver nitrate in the solution and keep stirring to dissolve it, and then add 1.1mol disodium hydrogen phosphate solution dropwise to obtain BiOCl / Ag 3 PO 4 , Transfer the precipitate to a polytetrafluoroethylene hydrothermal reactor and keep it at 140°C for several hours. Again, add 1.1 mol of ferrous chloride and 1.1 mol of elemental sulfur to the solution in sequence, then add 3 drops of 0.1 mol / L ammonia water to adjust the pH value of the solution to 7.2, react hydrothermally at 120°C for 12 hours, and wait for cooling Wash with deionized water and ethanol three times each, and then dry at 60 °C for 10 h to obtain BiOCl / Ag 3 PO 4 / FeS 2 powder.

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Abstract

The invention discloses a near-normal-temperature thermosensitive catalyst and a preparation method thereof. The catalyst is prepared from bismuth nitrate, silver nitrate, ferrous chloride and elemental sulfur, and the preparation method comprises the following steps of preparing a carrier BiOCl; preparing a carrier BiOCl / Ag3PO4; and preparing BiOCl / Ag3PO4 / FeS2. The thermosensitive catalyst prepared by the invention has the advantages of low cost, simplicity, operability and excellent degradation effect of efficiently degrading organic wastewater, and the methylene blue removal rate of the catalyst reaches 99.2%.

Description

technical field [0001] The invention relates to the technical field of metal salts and their composites and the degradation of organic waste water, in particular to a near normal temperature thermosensitive catalyst and a preparation method thereof. Background technique [0002] my country produces more than 100,000 tons of dyes every year, which are divided into 11 categories, namely vulcanization, acidity, alkalinity, reduction, activity, dispersion, directness, neutrality, ice dyeing and cationic. In addition, more than 100,000 tons of organic pigments, additives and intermediates are produced, with more than 550 varieties, and the amount of waste water is 1.57×10 8 m 3 / a, the wastewater treatment rate is only about 22.5%. [0003] Most of the organic components in dye wastewater are based on aromatic hydrocarbons and heterocyclic compounds, and have color and polar groups. Wastewater also contains more raw materials and by-products, such as aniline, phenols and inorg...

Claims

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Application Information

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IPC IPC(8): B01J27/186C02F1/58C02F101/30
Inventor 丁凤
Owner NANCHANG CAMPUS OF JIANGXI UNIV OF SCI & TECH