Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of solid-state heteropolyacid composite catalyst with surface-modified variable-valence metal ions and its preparation method and application

A technology of variable valence metal ions and composite catalysts, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the effective catalytic area and active site reduction, treatment Cost increase, catalyst poisoning and other problems, to achieve the effect of wide application, improved utilization, no secondary pollution

Inactive Publication Date: 2017-05-10
ZHEJIANG GONGSHANG UNIVERSITY
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 In the system, the reduced Cr(III) is easily deposited on the surface of the solid-phase photocatalyst, reducing the effective catalytic area and active sites, and causing catalyst poisoning; in addition, strong acidity (pH ≤ 3) is the rapid reduction of Cr(VI) the necessary conditions
Although strong acidic solution is conducive to the reduction of Cr(VI), in practical application, after the reaction is over, it is often necessary to add a strong base to adjust the solution to neutral or alkaline, so that Cr(OH) 3 Precipitate Cr(III) in the form, first adjust the strong acidity and then adjust it to basicity to increase the amount of alkali added, and the processing cost will increase

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of solid-state heteropolyacid composite catalyst with surface-modified variable-valence metal ions and its preparation method and application
  • A kind of solid-state heteropolyacid composite catalyst with surface-modified variable-valence metal ions and its preparation method and application
  • A kind of solid-state heteropolyacid composite catalyst with surface-modified variable-valence metal ions and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1g phosphotungstic heteropoly acid (H 3 PW 12 o 40 , referred to as HPW) dissolved in 100mL deionized water, with KNO 3 For the ion source, control K + The molar ratio of HPW to HPW is 3:1, and the water-insoluble solid-phase heteropolyacid POM is obtained by chemical deposition. The above liquid is centrifuged at 12000r / min for 3min using a centrifuge, and the obtained solid is heated at 105°C Dry in oven. Take out the solid in the centrifuge tube and use an agate mortar to grind the solid to a fine powder state, and place it in a muffle furnace for calcination at 450°C for 2 hours, and re-immerse the calcined POM in 20umol / L Fe(NO 3 ) 3 After 12 hours in the aqueous solution, centrifugation, separation, and drying, a solid-state heteropolyacid composite catalyst modified by iron ions (abbreviated as POM-Fe) was obtained.

Embodiment 2

[0055] 1g phosphotungstic heteropoly acid (H 3 PW 12 o 40 , referred to as HPW) dissolved in 100mL deionized water, with KNO 3 For the ion source, control K + The molar ratio of HPW to HPW is 3:1, and the water-insoluble solid-phase heteropolyacid POM is obtained by chemical deposition. The above liquid is centrifuged at 12000r / min for 3min using a centrifuge, and the obtained solid is heated at 105°C Dry in oven. Take out the solid in the centrifuge tube and use an agate mortar to grind the solid to a fine powder state, and place it in a muffle furnace for calcination at 450°C for 2 hours, and re-immerse the calcined POM in 20umol / L Cu(NO 3 ) 2 After 12 hours in aqueous solution, centrifugation, separation, and drying, a solid heteropolyacid composite catalyst modified by iron ions (abbreviated as POM-Cu) was obtained.

Embodiment 3

[0057] 1g phosphotungstic heteropoly acid (H 3 PW 12 o 40 , referred to as HPW) dissolved in 100mL deionized water, with Cs 2 CO 3 For the ion source, the molar ratio between the ion source and HPW is controlled to be 2.5:1, and the water-insoluble solid-phase heteropolyacid POM is obtained by chemical deposition, and the above liquid is centrifuged at 12000r / min using a centrifuge After 3 minutes, the obtained solid was dried in an oven at 105°C. Take out the solid in the centrifuge tube and use an agate mortar to grind the solid to a fine powder state, and place it in a muffle furnace for calcination at 450°C for 2 hours, and re-immerse the calcined POM in 20umol / L Fe(NO 3 ) 3 In the aqueous solution for 12 hours, after centrifugation, separation and drying, different counter-ionic solid-state heteropolyacid composite catalysts (abbreviated as POM-Fe) decorated with iron ions were obtained. The SEM morphology of the prepared POM-Fe was characterized, and it was found t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a solid heteropoly acid composite catalyst with the surface modified with variable valence metal ions, and a preparation method and an application thereof. The composite catalyst is composed of a solid heteropoly acid and variable valence metal ions loaded on the surface of the solid heteropoly acid, and the solid heteropoly acid is prepared through the following steps: dissolving phosphotungstic heteropoly acid in deionized water, preparing a phosphotungstic heteropoly acid parent through a chemical deposition technology with different ion pair sources as ion pairs, and calcining the phosphotungstic heteropoly acid parent. The composite catalyst is used in treatment of chromium-containing organic wastewater, and still has high catalysis activity in weakly acidic environment (with the pH value of 4-5).

Description

technical field [0001] The present invention relates to the technical field of a class of industrial wastewater treatment, in particular to a wastewater treatment technology that utilizes surface-modified metal ions to modify solid porous heteropolyacid visible light catalyzed synergistic reduction of highly toxic hexavalent chromium Cr(VI) and oxidatively degrades organic pollutants . Background technique [0002] In recent years, heavy metal pollution incidents in my country have been on the rise, posing a serious threat to the natural ecology and the masses. Taking heavy metal chromium as an example, it is an indispensable raw material for tanning, industrial pigments, printing and dyeing, electroplating, rubber and other industries. It is also a carcinogen and is one of the 129 key pollutants recognized by the US Environmental Protection Agency. It is the key control object of our country. Chromium pollution control is a worldwide environmental protection problem. The ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/18C02F1/30C02F1/72C02F1/70C02F101/22C02F101/30
CPCY02W10/37
Inventor 王齐朱纳鑫石晓东刘恩秦周甜甜刘妍秋张佰鑫丛燕青
Owner ZHEJIANG GONGSHANG UNIVERSITY