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Persulfate activating method

A persulfate and treatment method technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve problems such as non-recyclable, low cost, and potential toxicity, and improve the removal rate of wastewater , Strengthen the effect of governance

Inactive Publication Date: 2019-06-25
CHANGZHOU UNIV
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Problems solved by technology

[0002] Based on the sulfate radical (SO 4 - )’s advanced oxidation technology is a research hotspot in the field of environmental governance in recent years. Persulfate can be activated by ultraviolet light, heat, transition metals, etc. to produce SO 4 - · Among these activation methods, transition metal ion activation has higher practical application value compared with other activation methods due to its low energy consumption and low cost; however, transition metal activation is generally a homogeneous system, which easily causes metal ion dissolution. At the same time, the catalytic activity of the homogeneous system is greatly affected by the pH value, which cannot be recycled and has potential toxicity. In recent years, the activation methods of transition metal oxides have gradually emerged. Transition metal oxides can not only have transition The advantages of metal ion activation, and will not cause secondary pollution, can be recycled

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Embodiment 1

[0020] Experimental conditions: Experimental conditions: when adding PDS alone, the dosage of PDS is 3 g / L; adding Fe alone 3 o 4 when Fe 3 o 4 The dosage is 1 g / L; Fe 3 o 4 In the / PDS system, the dosage of PDS is 3 g / L, Fe 3 o 4 The dosage is 1 g / L, and the initial pH of the solution is 3.

[0021] Depend on figure 1 It can be seen that when PDS is added alone, the degradation rate of rhodamine B is 25.6%. PDS itself has a certain oxidation ability. When PDS is dissolved in aqueous solution, a hydrolysis reaction will occur to generate persulfate (S 2 o 8 2- ), its oxidation-reduction potential is 2.01V, which can effectively oxidize some pollutants, but its oxidation ability is relatively weak, so the degradation rate of rhodamine B in the reaction system is not high.

[0022] Dosing Fe alone 3 o 4 When , the degradation rate of rhodamine B in the system was only 22.7%. This is mainly because Fe 3 o 4 The crystal particles are larger and clustered, and have ...

Embodiment 2

[0025] Experimental conditions: PDS dosage is 3 g / L, reaction temperature is 25°C, Fe 3 o 4 The dosage was 1.0 g / L, and the initial pH of the solution was 3, 7, and 9, respectively. The treatment effect of the system on rhodamine B dye wastewater was mainly investigated under acidic, neutral and alkaline conditions. Depend on figure 2 It can be seen that the degradation rate of rhodamine B is the best under acidic conditions, with a degradation rate of 93.2 %, followed by neutral conditions, with a removal rate of 81.8 %; the worst treatment effect is under alkaline conditions, with a degradation rate of 70.4 %.

Embodiment 3

[0027] Experimental conditions: the initial pH of the solution is 3, the dosage of PDS is 3 g / L, the reaction temperature is 25 ℃, Fe 3 o 4 The dosage is 0.5, 1.0, 1.5 g / L respectively. Depend on image 3 It can be seen that when Fe 3 o 4 When the dosage is 0.5 g / L, the degradation rate of Rhodamine B is 85.2%, and when the dosage increases to 1.0 g / L, the removal rate is 93.2%. Ming B degradation rate. This is because Fe 3 o 4 The increase in the dosage is beneficial to improve the surface Fe 2+ The probability of exposure to persulfate, which promotes SO 4 - ·generate. But Fe 3 o 4 When the dosage was further increased to 1.5 g / L, the removal rate did not increase significantly.

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Abstract

The invention provides a persulfate activating method. A homogeneous system is generally adopted for common transition metal activation, secondary pollution is prone to being caused due to the fact that metal ions are dissolved in water, meanwhile, the catalysis activity of the homogenous system is largely affected by pH values, and the homogenous system cannot be recycled and has potential toxicity. Fe3O4 which is a non-homogenous Fenton reaction catalyst excellent in performance is adopted, activation of persulfate and degradation of pollutants occur on the surface of the Fe3O4, contact between generated SO4<->. and Fe<2+> in the Fe3O4 can be effectively reduced, the probability of side reaction is lowered, and it is ensured that the utilization rate of persulfate is high; and secondarypollution caused by a large amount of iron ions dissolved in water is avoided.

Description

technical field [0001] The invention belongs to the field of ecological environment protection, and in particular relates to a method for activating persulfate. Background technique [0002] Based on the sulfate radical (SO 4 - )’s advanced oxidation technology is a research hotspot in the field of environmental governance in recent years. Persulfate can be activated by ultraviolet light, heat, transition metals, etc. to produce SO 4 - · Among these activation methods, transition metal ion activation has higher practical application value compared with other activation methods due to its low energy consumption and low cost; however, transition metal activation is generally a homogeneous system, which easily causes metal ion dissolution. At the same time, the catalytic activity of the homogeneous system is greatly affected by the pH value, which cannot be recycled and has potential toxicity. In recent years, the activation methods of transition metal oxides have gradually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30
Inventor 魏永高赟任冰
Owner CHANGZHOU UNIV
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