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Method for degrading organic dye in water by activating persulfate by using molybdenum disulfide synergized bivalent iron

A technology for activating persulfate and molybdenum disulfide, which is applied in the field of water pollution treatment, can solve the problems of reducing the usage of persulfate and ferrous iron, easy precipitation, and difficult to circulate, and achieves broad practical application prospects and low usage. , the effect of low dosage

Active Publication Date: 2019-09-13
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The method of the invention solves the problems that Fe(III) is easy to precipitate and Fe(III) / Fe(II) is difficult to circulate in the Fe(II) excited persulfate system, and molybdenum disulfide has the advantages of being recyclable, environmentally friendly and non-toxic. Secondary pollution and other advantages, this method reduces the use of persulfate and ferrous iron under the premise of ensuring removal efficiency, and has strong practical application value

Method used

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  • Method for degrading organic dye in water by activating persulfate by using molybdenum disulfide synergized bivalent iron
  • Method for degrading organic dye in water by activating persulfate by using molybdenum disulfide synergized bivalent iron
  • Method for degrading organic dye in water by activating persulfate by using molybdenum disulfide synergized bivalent iron

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Embodiment 1

[0038] The present invention first investigates the persulfate itself, the persulfate oxidation technology based on ferrous iron and the persulfate oxidation technology effect based on molybdenum disulfide.

[0039] Add 10mL of 100mg / L Rhodamine B mother solution to the Erlenmeyer flask containing 90mL of ultrapure water, adjust the pH=3.0, stir evenly and take the sample before degradation, then add 1mL of PMS (C(PMS)=0.25mM) , after reacting for 60 minutes, take a water sample to test the Rhodamine B concentration and calculate its removal rate, the results are as follows figure 1 As shown, the removal rate was only 9%.

[0040] Add 10mL of rhodamine B mother liquor of 100mg / L in the Erlenmeyer flask that 89m ultrapure water is housed, ferrous iron solution 1mL (C(Fe 2+ )=10.8uM), adjust the pH=3.0, stir evenly, quickly take the undegraded sample, then add 1mL PMS (C(PMS)=0.25mM), after reacting for 60 minutes, take a water sample to test the concentration of rhodamine B an...

Embodiment 2

[0043] The present embodiment provides a method for treating sewage. The method specifically includes: adding 0.03 g of molybdenum disulfide cold water to an Erlenmeyer flask containing 89 mL of ultrapure water and ultrasonicating for 1 minute, and then adding 100 mg / L of rhodamine B Mother liquor 10mL, ferrous iron solution 1mL (C(Fe 2+ )=10.8uM), adjust the pH=3.0, stir evenly, quickly take the undegraded sample, then add 1mL PMS (C(PMS)=0.25mM), after reacting for 60 minutes, take a water sample to test the concentration of rhodamine B and Calculate its removal rate, and the results are shown in Table 1.

[0044] In this embodiment, on the basis of using the above-mentioned method to treat sewage, only the concentration of the PMS is adjusted to 0.1 and 1mM respectively to obtain another two groups of treated sewage, and the three groups of treated sewage above are treated. Data analysis, monitoring the concentration of Rhodamine B and calculating its removal rate, the res...

Embodiment 3

[0048] The present embodiment provides a method for treating sewage. The method specifically includes: adding 0.03 g of molybdenum disulfide cold water to an Erlenmeyer flask containing 89 mL of ultrapure water and ultrasonicating for 1 minute, and then adding 100 mg / L of rhodamine B Mother liquor 10mL, ferrous iron solution 1mL (C(Fe 2+ )=10.8uM), adjust the pH=3.0, stir evenly, quickly take the undegraded sample, then add 1mL PMS (C(PMS)=0.25mM), after reacting for 60 minutes, take a water sample to test the concentration of rhodamine B and Calculate its removal rate, and the results are shown in Table 2.

[0049] In this embodiment, on the basis of using the above method to treat sewage, only the Fe 2+ The concentrations were adjusted to be 5.4 and 54mM respectively, and another two groups of treated sewage were obtained. Data analysis was carried out on the above-mentioned three groups of treated sewage, the concentration of Rhodamine B was monitored and its removal rate...

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Abstract

The invention discloses a method for degrading organic dye in water by activating a persulfate by using molybdenum disulfide synergized bivalent iron. The method comprises the following steps: addingmolybdenum disulfide into ultrapure water, carrying out ultrasonic treatment at a temperature of 15-25 DEG C, then adding organic dye wastewater, uniformly carrying out mixing, then adding ferrous iron, adjusting the pH value to 2-4, then adding a persulfate to obtain a reaction system, and carrying out stirring at normal temperature for degradation. The use amount of molybdenum disulfide in the method is low, the molybdenum disulfide can be repeatedly used, and no secondary pollution is caused. Compared with a method of activating a persulfate by single bivalent iron, the method has the advantages that the use amount of bivalent iron is lower, the reaction time is greatly shortened, and a large amount of manpower, material resources and financial resources are saved. The application rangeof a pH value of the system is wide, and the activation effect is the best under the condition that the pH value is equal to 3. The method disclosed by the invention has a very simple process flow and does not need a complex device, the reaction conditions are mild, and a reaction can be carried out quickly at normal temperature and normal pressure. Operability is high, and the method has a widepractical application prospect.

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 molybdenum disulfide to cooperate with ferrous iron to activate persulfate to degrade organic dyes in water. [0003] (2) Background technology [0004] In advanced oxidation processes (AOPs), due to sulfate radicals (SO 4 - ) has attracted increasing attention in the field of water treatment due to its high reactivity with organic pollutants and high selectivity to complex environmental matrices. Potassium persulfate (PMS) and sodium persulfate (PS) with high water solubility, high stability and relatively low cost are two widely used drugs for generating sulfate radicals. In general, PMS and PS are activated by heat, ultraviolet light, ultrasound, electrochemistry, transition metal ions, or other methods to generate more and faster SO 4 - ·. These SOs 4 - ·Can react with water to form another powerful non-selective oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C02F1/30C02F101/30C02F101/38
CPCB01J27/0515C02F1/30C02F2101/308C02F2101/38
Inventor 罗宏伟程莹何东芹潘响亮
Owner ZHEJIANG UNIV OF TECH
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