Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Five-wavelength ultraviolet spectrum method for evaluating reduction performance of metal catalysis reductant

A technology of metal catalysis and ultraviolet spectroscopy, which is used in the field of evaluating the reduction ability of metal catalyst reductants and evaluating the treatment effect of metal catalyst reductants for the catalytic reduction of simulated dichlorobenzene in wastewater

Inactive Publication Date: 2016-12-07
SOUTH CHINA UNIV OF TECH
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of these methods increase the unpredictability of the research process. Therefore, there is an urgent need for a fast and efficient detection technology to simultaneously detect the process of metal catalytic reducing agents degrading dichlorobenzene, so as to better screen catalytic reducing agents and adjust Reaction conditions, such as: concentration of dichlorobenzene, amount of catalytic reducing agent, type of catalytic reducing agent and treatment temperature, etc.

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
  • Five-wavelength ultraviolet spectrum method for evaluating reduction performance of metal catalysis reductant
  • Five-wavelength ultraviolet spectrum method for evaluating reduction performance of metal catalysis reductant
  • Five-wavelength ultraviolet spectrum method for evaluating reduction performance of metal catalysis reductant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Embodiment 1 evaluates self-made metal catalytic reducing agent reducing effect

[0103] Put 31ml of 0.08mmol / L dichlorobenzene solution in a 20ml serum bottle (without headspace, oxygen isolation), add 0.05g self-made microfibrillated cellulose supported metal catalytic reducing agent (the molar ratio of nanometer Fe / Ni is 8:2 ), put it on a magnetic stirrer, the reaction temperature is 30°C, stop the reaction at different times, let it stand for 15 minutes, take the supernatant for ultraviolet light detection, and then bring it into the mathematical Formula (8) (9) (10), calculate the concentration of DCB, CB and B, see the experimental results Figure 4 .

[0104] From Figure 4 It can be seen that as the reaction proceeds, the concentration of dichlorobenzene decreases gradually, and is almost 0 after 3 hours, while benzene has been increasing gradually, and the concentration of chlorobenzene has not been high, indicating that the final product of the catalytic re...

Embodiment 2

[0105] Embodiment 2 evaluates commercially available certain metal catalytic reducing agent reduction effect

[0106] Put 31ml of 0.08mmol / L dichlorobenzene solution in a 20ml serum bottle (without headspace, oxygen isolation), add 0.05g of commercially available nano-iron powder, place it on a magnetic stirrer, react at a temperature of 30°C, and stop at different times React, let it stand for 15 minutes, take the supernatant for ultraviolet light detection, and then bring the absorbance values ​​at 260, 269, 277, 290 and 300nm into the mathematical formula (8) (9) (10) to calculate the DCB, CB and B Concentration, the experimental results see Figure 5 .

[0107] From Figure 5 It can be seen that after reduction, the concentration of dichlorobenzene is very high, but the concentration of benzene is not high, indicating that the reduction ability of commercially available nano-iron powder is not as good as that of self-made nano-catalyzed reducing agent.

Embodiment 3

[0108] Embodiment 3 evaluates self-made metal catalytic reducing agent reducing effect

[0109] Put 31ml of 0.08mmol / L dichlorobenzene solution in a 20ml serum bottle (without headspace, oxygen isolation), add 0.05g self-made microfibrillated cellulose supported metal catalytic reducing agent (the molar ratio of nanometer Fe / Ni is 8:2 ), put it on a magnetic stirrer, the reaction temperature is 20°C, stop the reaction at different times, let it stand for 15 minutes, take the supernatant for ultraviolet light detection, and then bring it into the mathematical Formula (8) (9) (10), calculate the concentration of DCB, CB and B, see the experimental results Figure 6 .

[0110] From Figure 6 It can be seen that the low reaction temperature is unfavorable to the reduction reaction, the concentration of dichlorobenzene is still very high, and the amount of benzene generated is very little.

[0111] Therefore, according to this method, the reducing performance of the catalytic re...

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

No PUM Login to View More

Abstract

The invention belongs to the technical field of detection methods, and discloses a five-wavelength ultraviolet spectrum method for evaluating reduction performance of metal catalysis reductant. The method includes the steps of 1, absorbancy-wavelength standard curves of 1,2-dichlorobenzene, chlorobenzene and benzene are drawn; 2, the characteristic absorption wavelength is determined according to the standard curves, and the absorbancy-concentration standard curve of all the substances at the characteristic wavelength position is drawn to determine the extinction coefficient; 3, a mathematical formula is set up; 4, the metal catalysis reductant is added into simulation wastewater containing 1,2-dichlorobenzene to react in a contact mode and stands, supernate is taken and scanned in a full-wavelength range, light absorption values at the 260 nm, 269 nm, 277 nm, 290 nm and 300 nm positions are recorded, the concentration of dichlorobenzene, chlorobenzene and benzene in the simulation wastewater is calculated, the reduction capacity of the catalysis reductant and the catalysis effect of the catalysis reductant under different reaction conditions are evaluated. The method is simple and capable of fast evaluating reduction performance of metal catalysis reductant.

Description

technical field [0001] The invention belongs to the technical field of detection methods, and relates to a method for evaluating the reducing ability of a metal catalytic reducing agent, in particular to a detection method for evaluating the treatment effect of dichlorobenzene in simulated wastewater by catalytic reduction of a metal catalytic reducing agent using an ultraviolet spectrum analysis method . Background technique [0002] Chlorobenzene compounds are usually used as solvents, insecticides, fungicides and intermediates for the synthesis of many organic compounds. O-dichlorobenzene is widely used and is an important organic chemical raw material for the production of dyes, medicines, pesticides, engineering plastics, etc. They pass It enters the environment in various ways, pollutes water bodies, soil, sediment layers, aquifers, etc., and bioaccumulates in the important food chains of humans, especially in aquatic organisms. Some also volatilize into the air and c...

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 Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 万小芳郭从宝李友明
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products