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Method of degrading printing and dyeing wastewater by activating persulfate with graphite-phase carbon nitride under dark reaction conditions

A technology of graphite phase carbon nitride and activated persulfate, which is applied in the direction of chemical instruments and methods, chemical/physical processes, nitrogen and non-metallic compounds, etc., can solve the problem of secondary pollution of metal activation, and achieve a stable removal effect Effect

Pending Publication Date: 2020-04-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activation of persulfate (PS) production by heating, ultraviolet light, and transition metal ions However, the activation of heat and light requires additional energy, which is mostly restricted by equipment conditions and energy consumption. There is a risk of secondary pollution in metal activation.

Method used

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  • Method of degrading printing and dyeing wastewater by activating persulfate with graphite-phase carbon nitride under dark reaction conditions
  • Method of degrading printing and dyeing wastewater by activating persulfate with graphite-phase carbon nitride under dark reaction conditions
  • Method of degrading printing and dyeing wastewater by activating persulfate with graphite-phase carbon nitride under dark reaction conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Weigh 5 g of melamine and grind finely in a mortar to obtain powder A.

[0024] 2) Pour powder A into an alumina crucible, cover it and place it in a muffle furnace for 4h, heating rate 5℃ / min, calcination temperature 550℃, take out after the muffle furnace temperature drops to 80℃, get sample B.

[0025] 3) Transfer sample B into a mortar and grind to obtain a light yellow powder as graphite phase carbon nitride.

[0026] The scanning electron microscope image of the graphite phase carbon nitride material prepared above is as follows figure 1 As shown in the figure, it can be seen that the material has an irregular lamellar stacked structure, with uneven size distribution and a relatively smooth surface.

[0027] The X-ray diffractometer diagram of the graphite phase carbon nitride material prepared above is as follows figure 2 As shown, diffraction peaks appear at 2θ of 13.1° and 27.4°, corresponding to g-C 3 N 4 The (100) and (002) crystal planes indicate that the synthe...

Embodiment 2

[0029] 1) Configure a 10 mg / L methylene blue solution as the target pollutant, measure 100 ml of the solution and a beaker, control the initial pH of the solution to 5, and the reaction temperature to 25°C, which is recorded as solution A.

[0030] 2) Under dark and shading conditions, add the graphite phase carbon nitride powder prepared in Example 1 to solution A, the dosage is 0.8g / L, and continue to stir for 30 minutes to achieve the adsorption-desorption of the catalyst and the target degradation product. With equilibrium, mixture B is obtained.

[0031] 3) Under dark and shading conditions, add sodium persulfate to the mixture B, the dosage is 5mg / L, start timing and continue to stir, and the reaction ends after 60 minutes.

[0032] The above experiment shows that the graphite phase carbon nitride activated sodium persulfate degrades the methylene blue of typical printing and dyeing wastewater under dark reaction conditions. image 3 .

[0033] The results show that the use of m...

Embodiment 3

[0035] Advantages of the present invention-stability and recycling test

[0036] Stability and recycling test

[0037] The present invention studies the stability and recycling properties of the catalyst in the experiment of degrading methylene blue by graphite phase carbon nitride activated persulfate under dark reaction conditions, and filters the graphite phase carbon nitride powder after participating in the reaction in specific implementation case 2. Collect, use ethanol and deionized water to alternately rinse and centrifuge to obtain clean powder, which is dried in an oven to obtain dry powder. Four cycles of experiments were carried out under the same experimental conditions, and the graphite phase carbon nitride powder (g-C 3 N 4 *4).

[0038] Graphite phase carbon nitride powder (g-C 3 N 4 *4) The scanning electron microscope picture is as follows Figure 4 As shown in the figure, it can be seen that the material is still in an irregular lamellar stacked structure, which ...

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Abstract

The invention belongs to a method of degrading printing and dyeing wastewater under dark reaction conditions. The method is characterized in that graphite-phase carbon nitride and persulfate form a heterogeneous system (g-C3N4 / PS) under dark reaction conditions to remove a typical pollutant methylene blue (MB) of printing and dyeing wastewater, and the method comprises the following steps of: taking melamine as a raw material, and preparing the graphite-phase carbon nitride by adopting a high-temperature calcination method, adding the graphite-phase carbon nitride powder into a methylene bluesolution, continuously shading and stirring for 30 minutes, continuously adding sodium persulfate, keeping a shading and stirring state, starting timing, and reaching the maximum removal rate of pollutants after 10 minutes. In the method, after the catalyst is recycled for 4 times, the pollutant removal rate is still 85% or above. The treatment method does not need illumination, heating and otherconditions, has the advantages of high reaction rate and low energy consumption as compared with the existing treatment method, and widens the applicable range.

Description

Technical field [0001] The invention belongs to the field of sewage treatment. Specifically, it relates to a method for degrading printing and dyeing wastewater by using graphite phase carbon nitride to activate persulfate under dark reaction conditions. Background technique [0002] The large discharge volume, high organic content and complex composition of dye wastewater pose a huge threat to the water environment and human health. The search for green and efficient dye wastewater degradation methods has become the current research focus. Graphite phase carbon nitride (g-C 3 N 4 ) As a new type of non-metal semiconductor material, it has good chemical stability and is widely used in the fields of photolysis of hydrogen, photocatalytic reduction of CO2, photocatalytic degradation of pollutants, and photocatalytic sterilization. g-C 3 N 4 Photo-generated electron holes (h+) and oxygen generate superoxide radicals under visible light catalysis Active species such as hydroxyl rad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C01B21/082B01J27/24C02F101/30
CPCC02F1/725C01B21/082B01J27/24C02F2101/308Y02P20/584Y02W10/37
Inventor 王丽娟张海潇张锐
Owner HEBEI UNIV OF TECH
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