Method of treating organic wastewater based on Fenton-like reaction of iron-based organic-framework material

A technology of organic wastewater and metal skeleton materials, applied in chemical instruments and methods, water treatment of special compounds, oxidized water/sewage treatment, etc., can solve the problems of low loading of transition metals, easy loss of metal ions, and improvement of catalytic activity , to achieve the effects of easy access, broad practical application prospects, and easy promotion

Inactive Publication Date: 2015-01-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts generally have problems such as low transition metal loading, catalytic activity to be improved, and easy loss of metal ions. Therefore, the preparation of efficient and stable catalysts is a hot research topic.

Method used

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  • Method of treating organic wastewater based on Fenton-like reaction of iron-based organic-framework material
  • Method of treating organic wastewater based on Fenton-like reaction of iron-based organic-framework material
  • Method of treating organic wastewater based on Fenton-like reaction of iron-based organic-framework material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of catalyst MIL-53 (Fe): with 1.081g FeCl 3 ·6H 2 O and 0.665 g of terephthalic acid were dissolved in 20 mL of N, N-dimethylformamide (DMF), stirred at room temperature for 10 min, mixed evenly, and then packaged in a reaction vessel with a Teflon liner, in React at 150°C for 5h, cool to room temperature; centrifuge, wash with deionized water, pour the obtained tan powder into 200mL deionized water and let it stand for 12h, then centrifuge, and finally vacuum dry at 60°C for 24h. The prepared catalyst MIL-53(Fe) has a specific surface area of ​​1095m 2 / g, the pore diameter is 0.74nm.

[0024] Degradation of organic wastewater: Prepare 50 mL of rhodamine B dye wastewater with a concentration of 10.0 mg / L, adjust the pH value to 2.3 with HCl or NaOH, add 20 mg MIL-53 (Fe) and 162 mg potassium persulfate as catalyst and oxidant respectively, Stir magnetically at room temperature. After 120 minutes, the degradation rate of Rhodamine B was 91.0%.

Embodiment 2

[0026] The preparation of catalyst MIL-101 (Fe): 0.675g FeCl 3 ·6H 2 O and 0.206 g of terephthalic acid were dissolved in 15 mL of N, N-dimethylformamide (DMF), stirred at room temperature for 10 min, mixed well, and then packaged in a reaction vessel with a Teflon liner, in React at 110°C for 20h, cool to room temperature; centrifuge, then heat-treat in 50ml ethanol at 60°C for 3h, perform a total of two heat-treatments to remove adsorbed impurities, and finally vacuum-dry at 60°C for 24h. The prepared catalyst MIL-101(Fe) has a specific surface area of ​​3400m 2 / g, the pore size is 1.2 and 1.4nm.

[0027] Degradation of organic wastewater: prepare 50mL of rhodamine B dye wastewater with a concentration of 1.0mg / L, adjust the pH value to 11.0 with HCl or NaOH, add 10.0mg MIL-101(Fe) and 50mg potassium persulfate as catalyst and oxidant respectively , magnetically stirred at room temperature. After 120 minutes, the degradation rate of rhodamine B was 69.7%.

Embodiment 3

[0029] The preparation of catalyst MIL-100 (Fe): with 0.676g FeCl 3 ·6H 2 O and 0.347g of trimesic acid were dissolved in 15mL of deionized water, stirred at room temperature for 10min, mixed evenly, then packaged in a polytetrafluoroethylene-lined reactor, reacted at 160°C for 12h, and cooled to room temperature; After centrifugation, heat treatment in 50ml ethanol at 60°C for 3h, a total of two heat treatments to remove adsorbed impurities, and finally vacuum drying at 60°C for 24h. The specific surface area of ​​the prepared catalyst MIL-100(Fe) is 2210m 2 / g, the pore size is 0.55 and 0.86nm.

[0030] Degradation of organic wastewater: Prepare 50mL of 2,4-dichlorophenol wastewater with a concentration of 10.0mg / L, adjust the pH value to 2.0 with HCl or NaOH, add 50mg MIL-100(Fe) and 125mg potassium hydrogen persulfate to compound Salt as catalyst and oxidant, magnetic stirring at room temperature. After 120 minutes, the degradation rate of 2,4-dichlorophenol was 85.3%. ...

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Abstract

The invention discloses a method of treating organic wastewater based on Fenton-like reaction of an iron-based organic-framework material. The method comprises the following steps: by taking the iron-based organic-framework material as a catalyst and taking persulfate or hydrogen persulfate as an oxidant, degrading organic pollutants by virtue of sulfate radicals formed in a reaction process. The iron-based organic-framework material has a relatively great specific surface area and a relatively great bore diameter, is regular in metal ion spatial arrangement, uniform in distribution, high in active point location density, high in catalytic activity, environmentally friendly, easy to recycle and capable of being recycled. And moreover, the method is simple in equipment, convenient to operate, capable of efficiently degrading organic pollutants in water within a relatively wide pH value range, and very great in application prospect.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for treating organic wastewater based on a Fenton-like reaction of an iron-based organic-skeleton material. Background technique [0002] In recent years, based on the sulfate radical (SO 4 ?· ) advanced oxidation technology is favored at home and abroad. Persulfate (S 2 o 8 2? , PS) or hydrogen persulfate (HSO 5 ? , PMS) can be activated by ultraviolet light, heat, transition metals, etc. to produce SO 4 ?· . Among these activation methods, activation by transition metal ions is more widely used due to its low energy consumption and low cost. However, transition metal ions (such as Co 2+ 、Cu 2+ , Fe 2+ and Ag + etc.) The catalytic activity is greatly affected by the pH value, cannot be recycled, and has certain toxicity to the environment. Therefore, heterogeneous catalysts based on transition metal ions have attracted much attention. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/72C02F2101/30C02F2101/345C02F2101/36C02F2101/38C02F2305/026
Inventor 李祥惠张琪颖岳馨馨刘中华郝菲菲国伟林
Owner UNIV OF JINAN
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