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Method for degrading azo dye through photo-enzyme catalysis

A photo-enzyme catalyzed azo and azo technology, applied in chemical instruments and methods, water pollutants, water treatment of special compounds, etc. The effect of high degradation rate

Pending Publication Date: 2022-03-04
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, high concentration of hydrogen peroxide will quickly reduce the activity of enzymes, which limits the application of peroxidase in dye decolorization, especially for some waste liquids with high concentration of dyes; secondly, hydrogen peroxide acts as an unstable strong Oxidizing substances, their storage and transportation require a lot of manpower and material resources, and even pose a safety hazard; third, hydrogen peroxide is listed by the World Health Organization as a third-class carcinogen, which may endanger the health of operating workers

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  • Method for degrading azo dye through photo-enzyme catalysis
  • Method for degrading azo dye through photo-enzyme catalysis
  • Method for degrading azo dye through photo-enzyme catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Photocatalyst Au-TiO 2 preparation of

[0029] The AuCl used in this example 3 and TiO 2 (Anatase or rutile, 10-25nm) were purchased from Anaiji Chemical. Photocatalyst Au-TiO 2 The preparation method is as follows: 5mM AuCl 3 The solution (77.5mg 98% gold chloride dissolved in 50mL deionized water) was heated to 70°C, and the pH was adjusted to 7.2 with 0.1M NaOH solution; 97mL deionized water was taken and heated to 70°C, and 11mL of the above-mentioned AuCl was added 3 solution, stirred for 10 minutes, added 1g TiO 2 Granulate and stir at 70°C for 1 hour. Cool to room temperature, centrifuge at a rate of 6000rpm for 15 minutes, wash three times with deionized water and centrifuge to remove the supernatant, dry overnight at 70°C (about 1.1% Au), photocatalyst Au-TiO 2 (According to the different raw materials, it is divided into anatase Au-TiO 2 or rutile Au-TiO 2 ).

[0030] Under the scanning electron microscope, we found that the anatase and rut...

Embodiment 2

[0031] Embodiment 2 light-enzyme catalyzes the degradation of acid red 1

[0032] The reaction conditions were: Acid Red 1 dye concentration of 0.05 mml / L, disodium phosphate-citrate buffer at pH=4, 0.2 mg / mL HRP and 0.5 mg / mL Au-TiO 2 As a catalyst, react at 25°C to investigate the catalytic effect of two different crystal photocatalysts, the results are shown in Table 1. We found that under the same conditions, the anatase Au-TiO 2 With high catalytic activity, 80% of acid red dye can be degraded in 5 minutes when combined with HRP, and the degradation rate can be increased to 85% if the time is extended to 15 minutes; while rutile Au-TiO 2 It can also cooperate with enzymes to catalyze the degradation of dyes, with degradation rates of 62% and 81% in 5 minutes and 15 minutes, respectively. combine Figure 4 The scanning electron microscope image, we speculate that it may be anatase Au-TiO 2 Has a regular surface structure, large specific surface area, high catalytic eff...

Embodiment 3

[0037] Embodiment 3 photo-enzyme catalytic system is to the degradation effect of various dyes

[0038] Under this catalytic system, we selected 5 kinds of dyes for degradation test, the results are as follows: Image 6 shown. Regardless of the dyes with monoazo, disazo or trisazo structures, no matter what color system the dyes are, the photo-enzyme catalytic system established in this study has a good catalytic degradation effect. Among them, Direct Green 6, which has the most complex structure and the largest molecular weight, has the highest degradation rate of 86%, while Acid Orange 7, which has the smallest molecular mass and the simplest structure, has the lowest degradation rate of only 49%. In the system, the influence of the type of dye on the catalytic efficiency is actually multifaceted. On the one hand, the color of the dye will affect the wavelength and energy of light absorbed by the photocatalyst. On the other hand, the dye is catalyzed and degraded in the act...

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Abstract

The invention discloses a method for degrading azo dyes through photo-enzyme catalysis, which comprises the following steps: under the conditions of a photocatalyst Au-TiO2, enzyme, oxygen and light, carrying out degradation reaction on wastewater containing azo dyes under an acidic condition to obtain wastewater after dye degradation. According to the method, two-step reaction of photocatalytic in-situ hydrogen peroxide generation and enzyme catalytic oxidation is combined, so that decoloration and degradation of various azo dyes are successfully realized, and the method can be used for degradation of various azo dyes, including acid red 1, acid yellow 36, acid orange 7, acid black 1, direct blue 6 and direct green 6, and has relatively high degradation rate.

Description

technical field [0001] The invention belongs to the field of dye degradation, and in particular relates to a photoenzyme-catalyzed degradation method for azo dyes. Background technique [0002] With the continuous emergence of new varieties of dyes and the continuous increase in consumption, the amount of printing and dyeing wastewater is also increasing. Data show that the daily discharge of printing and dyeing wastewater in my country has reached 300-400t, causing great environmental pollution and posing a threat to human survival. Therefore, how to efficiently treat dyes in wastewater is a hot issue of common concern in domestic and foreign academic and industrial circles. [0003] Based on the chemical structure of the chromophore, dyes can be divided into azo, anthraquinone, indigo and triarylmethane, among which azo and anthraquinone are the two most widely used in the printing and dyeing industry. At present, the commonly used treatment methods for printing and dyei...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/72C02F101/30C02F101/34C02F101/38
CPCC02F1/30C02F1/725C02F1/722C02F2305/10C02F2101/308C02F2101/40C02F2101/38C02F2101/34C02F2209/02
Inventor 陈晓阳
Owner JIAXING UNIV
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