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

A method for degrading azo dyes in waste water

A technology for azo dyes and wastewater, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of high preparation cost, surface water and groundwater pollution, and complex catalyst preparation process.

Active Publication Date: 2020-09-18
HENAN POLYTECHNIC UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) When the catalyst is used together with ultrasound and oxidant, the preparation process of the catalyst is complicated and the preparation cost is high
However, when the above-mentioned persulfate is used as an oxidizing agent, a large amount of SO will be produced after the decomposition of the persulfate. 4 2- , exist stably after entering the water body, and cause pollution to surface water and groundwater, 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
  • A method for degrading azo dyes in waste water
  • A method for degrading azo dyes in waste water
  • A method for degrading azo dyes in waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Degradation of different concentrations of Acid orange 8 azo dyes. Prepare 0.03mmol / L Acidorange 8 solution, add H 2 o 2 and Na 2 CO 3 , so that the solution H 2 o 2 The concentration is 50mmol / L, Na 2 CO 3 The concentration is 5mmol / L, and the total volume is 150mL. Insert the ultrasonic probe into the dye wastewater, and set the ultrasonic working mode to run for 2s and interval for 2s. Turn on the ultrasonic generator switch, and the processing time is 2h. Record the absorbance change value within 2 hours, as shown in Figure 3(a), the degradation rate reaches 90% within 2 hours. Increases dye concentration by 50x. Prepare 0.15mmol / L solution of azo dye Acid orange 8, as shown in Figure 3(b) to obtain a similar effect to Figure 3(a).

Embodiment 2

[0032] Example 2: Fixing the concentration of the azo dye and exploring its optimal conditions. Prepare 0.1mmol / L solution of azo dye Acidorange 8, add H 2 o 2 and Na 2 CO 3 , with a total volume of 150 mL, treated at 30 °C for 2 h. Change the H in the system respectively 2 o 2 Concentration, sodium carbonate concentration, pH and temperature, to study the degradation effect of azo dyes under different conditions. Such as Figure 4 As shown in (a), the fixed sodium carbonate concentration is 50mmol / L, with H 2 o 2 As the concentration increased, the degradation effect of the dye within 2 hours increased accordingly. Figure 4 In (b), fix H 2 o 2 The concentration is 20mmol / L. With the increase of sodium carbonate concentration, the degradation effect of dyes within 2h is also gradually improved, but when the concentration of sodium carbonate exceeds 50mmol / L, the benefit ratio decreases. Figure 4 In (c), the system has a good degradation effect on azo dyes in an a...

Embodiment 3

[0033] Example 3: Degrading the azo dye Acid orange 8 with the best ratio. Prepare 0.1mmol / L solution of azo dye Acid orange 8, add H 2 o 2 and Na 2 CO 3 , so that the solution H 2 o 2 The concentration is 20mmol / L, Na 2 CO 3 The concentration is 50mmol / L, and the total volume is 150mL. Insert the ultrasonic probe into the dye wastewater, and set the ultrasonic working mode to run for 2s and interval for 2s. Turn on the ultrasonic generator switch and process for 2h. Record the absorbance change value within 2h, such as Figure 5 The degradation rate was 92% within 2 hours.

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 relates to a method of degrading azo dye wastewater. The method utilizes ultrasound and H2O2 to produce OH, and Na2CO3 is added to promote the degradation of the azo dye wastewater. Under the effects of the ultrasound and the H2O2, the azo dye degradation efficiency is greatly improved due to the synergistic effect of Na2CO3. The maximum absorbance of azo dyes is determined by using an ultraviolet-visible spectrophotometer, and the (Acid orange8) azo dye wastewater degradation rate is improved from 6% to 90% or above within 2 hours by adding the Na2CO3.

Description

technical field [0001] The invention relates to a method for degrading azo dyes in wastewater, belonging to the technical field of dye wastewater treatment. Background technique [0002] Azo dyes refer to a class of dyes containing an azo group (-N=N-) in the molecule. Azo dyes are the most widely used synthetic dyes in textile, paper, leather, printing and other industries, accounting for 80% of the total organic dye products. At least 10% to 15% of these dyes will enter the water body. Because of their anti-light and anti-oxidation capabilities, they can exist stably in the water body and cause damage to the water body ecosystem. In addition, azo dyes are also carcinogenic, carcinogenic, and Teratogenic, mutagenic and biodegradable, easy to accumulate in the environment and pose a hazard to organisms and human health. Therefore, economical and efficient treatment of wastewater containing azo dyes has very important theoretical value and engineering practical significance...

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): C02F1/36C02F1/72C02F101/30C02F101/38
CPCC02F1/36C02F1/722C02F2101/308C02F2101/38C02F2209/02C02F2209/06C02F2305/023
Inventor 赵同谦李鹏邰超佘加平冯磊齐永安张国成武俐肖春艳
Owner HENAN POLYTECHNIC UNIV