Method for degrading organic dye by using heterogeneous Fenton system

A heterogeneous Fenton and organic dye technology, applied in the field of water pollution treatment, can solve the problems of slow degradation rate of organic matter, low oxidation efficiency, complicated operation, etc., and achieve the effect of increasing removal rate and improving removal efficiency

Pending Publication Date: 2020-04-14
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] The traditional homogeneous Fenton reaction system has the characteristics of fast oxidation rate and simple operation, but because the system contains a large amount of Fe 2+ , the oxidation utilization rate of the system is not high, the pollutants cannot be completely degraded, and iron precipitation is easy to cause secondary pollution
Based on the shortcomings of the traditional Fenton system, various iron oxides such as Fe 2 o 3 , FeOOH and Fe 3 o 4 Equal to H 2 o 2 The composition of the heterogeneous Fenton-like system, although this type of system solves the problem of iron precipitation compared with the traditional homogeneous system, but the oxidation efficiency is low, and the degradation rate of organic matter is very slow
Therefore, the use of heat, ultraviolet light, ultrasonic, electrochemical and other means to directly excite H 2 o 2 Decomposition or reduction of Fe 3+ produce Fe 2+ Catalytic H 2 o 2 Decomposition produces hydroxyl radicals (OH) to improve the oxidation efficiency of the system, but these physical and chemical means are not only complicated to operate, but also not easy to control, and are not suitable for large-scale sewage treatment applications

Method used

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  • Method for degrading organic dye by using heterogeneous Fenton system
  • Method for degrading organic dye by using heterogeneous Fenton system
  • Method for degrading organic dye by using heterogeneous Fenton system

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The influence of different systems of embodiment 1 on removing rhodamine B

[0030] (1) hydrogen peroxide

[0031] After adding 89mL of ultrapure water into a 250mL Erlenmeyer flask, add 10mL of rhodamine B mother liquor, and use H 2 SO 4 Adjust the pH to 3.0, stir evenly and take a "zero" sample, then add 97.9mM H 2 o 2 1mL of aqueous solution constitutes a 100mL reaction system, so that the H in the reaction system 2 o 2 Add the final concentration of 0.979mM, shake and react at 25°C for 60 minutes, take water samples at 0.5, 1, 1.5, 2, 3.5, 5, 7.5, 10, 15, 20, 30, 45, and 60 minutes respectively, and use UV spectrophotometry detects the absorbance value A at a wavelength of 558nm, and the standard curve A=0.212C+0.0039(R) measured by the rhodamine B standard solution of different concentration gradients (C) 2 =0.9998) obtain Rhodamine B concentration in the sample, and calculate Rhodamine B removal rate (%) by formula (1), the result is as follows figure 1 As ...

Embodiment 2

[0042] Example 2 Different H 2 o 2 Effect of Concentration on Removal of Rhodamine B

[0043] After adding 88mL of ultrapure water into a 250mL Erlenmeyer flask, add 0.03g of molybdenum disulfide, ultrasonic (300W) at room temperature for 1 minute, add 10mL of rhodamine B mother solution and 1mL of 15mM ferric chloride aqueous solution, and use H 2 SO 4 Adjust the pH to 3.0, stir evenly, take the "zero" sample, and then add H 2 o 2 1mL of aqueous solution constitutes 100mL system, so that the final concentration of ferric chloride in the reaction system is 0.15mM, H 2 o 2 The final concentration of adding was 0.024mM, 0.098mM, 0.490mM, 0.979mM respectively, and the reaction was shaken at 25°C for 60 minutes, and the rhodamine B removal rate was calculated with the method in Example 1. The results are shown in Table 1.

[0044] Table 1 Different concentrations of H 2 o 2 Effect on removal rate

[0045] h 2 o 2 (mM)

Embodiment 3

[0046] The impact of embodiment 3 different concentrations of iron ions on the removal rate

[0047] After adding 88mL of ultrapure water into a 250mL Erlenmeyer flask, add 0.03g of molybdenum disulfide, ultrasonicate (300W) for 1 minute at room temperature, add 10mL of rhodamine B mother solution, add 2.5mM, 1mM, 5mM, 10mM, 15mM 1mL ferric chloride aqueous solution, with H 2 SO 4 Adjust pH=3.0, stir well and take "zero" sample, then add 97.9mM, H 2 o 2 1mL of aqueous solution constitutes a 100mL reaction system, so that the H in the reaction system 2 o 2 Add the final concentration of 0.979mM, Fe 3+ The final concentrations were 0.025mM, 0.01mM, 0.05mM, 0.1mM, 0.15mM respectively, and the reaction was shaken at 25°C for 60 minutes, and the removal rate was calculated with the method in Example 1. The results are shown in Table 2.

[0048] Table 2 The influence of different concentrations of iron ions on the removal rate

[0049] Fe 3+ (mM)

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Abstract

The invention discloses a method for degrading an organic dye by using a heterogeneous Fenton system. The method comprises the following steps: adding molybdenum disulfide into ultrapure water, carrying out uniform ultrasonic dispersion at normal temperature, adding organic dye wastewater, mixing uniformly, adding ferric iron, and regulating the pH value to 2-7; and finally adding hydrogen peroxide to form a reaction system, and carrying out a stirring reaction at normal temperature to oxidize and degrade the organic dye. According to the invention, in the novel heterogeneous Fenton-like system composed of ferric ions, hydrogen peroxide and molybdenum disulfide, molybdenum disulfide cooperates with ferric ions to catalyze hydrogen peroxide to be rapidly decomposed to generate hydroxyl radicals (.OH) so as to efficiently oxidize and remove organic pollutants in water, wherein the removal rate of organic dyes reaches 91%, and the removal rate is increased by 71%; and molybdenum disulfidecan still catalyze the system disclosed by the invention to remove 89.5% of organic dyes after eight cycle tests.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of water pollution treatment, and in particular relates to a method for degrading organic dyes in water by a novel heterogeneous Fenton-like system composed of ferric ions, hydrogen peroxide and molybdenum disulfide. [0003] (2) Background technology [0004] In recent years, with the rapid development of social industry, the discharge of industrial wastewater has continued to increase, causing huge pollution to ecological water bodies. Among them, printing and dyeing wastewater is one of the difficult-to-treat wastewater generated by industry. Printing and dyeing wastewater contains dyes, dyeing auxiliaries, oil agents, etc., and has the characteristics of high organic content, complex components, high chroma and large water volume. According to previous studies, Fe 2+ and H 2 o 2 In the traditional homogeneous Fenton system composed of Fe 2+ Catalyzed by H 2 o 2 It can quickly decompose an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/722C02F1/725C02F2101/308C02F2305/026
Inventor 罗宏伟曾一峰程莹何东芹潘响亮
Owner ZHEJIANG UNIV OF TECH
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