Preparation method and application of bimetallic Prussian blue analogue catalyst

A Prussian blue and catalyst technology, which is applied in the field of preparation of bimetallic Prussian blue analog catalysts, can solve the problems of poor stability, limited number of catalyst active sites, and low utilization rate of oxidants, and achieve good cycle stability and broaden the Response pH range, low toxicity effect

Active Publication Date: 2022-01-11
NANJING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008]Aiming at the deficiencies in the heterogeneous photo-Fenton catalytic technology based on hydroxyl radicals, such as limited number of catalyst active sites, low utilization rate of oxidant, stable problems such as poor performance; the present invention provides a preparation method of a bimetallic Prussian blue analog catalyst, which is applied to activate hydrogen peroxide to efficiently and stably remove refractory organic matter in water

Method used

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  • Preparation method and application of bimetallic Prussian blue analogue catalyst
  • Preparation method and application of bimetallic Prussian blue analogue catalyst
  • Preparation method and application of bimetallic Prussian blue analogue catalyst

Examples

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Effect test

Embodiment 1

[0050] 1) Weigh 1.8 g of polyvinylpyrrolidone and fully dissolve it in 60 mL of water, add 73.944 mg (5 mM) of anhydrous cerium chloride and mix with the above solution to prepare dispersion A, weigh 98.775 mg (5 mM) Potassium ferricyanide was added into 60 mL of water, and stirred ultrasonically until the potassium ferricyanide was uniformly dissolved to obtain solution B (the molar ratio of the bimetallic precursor was 1:1);

[0051] 2) Dispersion A was slowly dripped into solution B drop by drop to undergo cation exchange reaction to obtain suspension C, and its pH was adjusted to 4 with 1 M dilute hydrochloric acid; the suspension C was transferred to a three-necked flask, ℃, 2000 rpm stirring and heating conditions for hydrothermal reaction, the reaction time was controlled at 20 h, and precipitate D was formed.

[0052] 3) After centrifugation, the obtained precipitate was washed three times with ethanol and water by suction filtration, and finally dried at 60°C for 12 h...

Embodiment 2

[0057] The difference between this embodiment and Example 1 is that the ratio of the amount of anhydrous cerium chloride and potassium ferricyanide in step 1) is 2:1, 3:2, 1:1, 2: 3. 1:2, the others are the same as in Example 1.

[0058] See the experimental results figure 2 ; Under the condition of the optimal bimetallic precursor ratio (1:1), the catalyst can achieve the complete degradation of sulfamethoxazole within 30 min, and has obvious kinetic advantages.

Embodiment 3

[0060] The difference between this embodiment and Example 1 is that in step 2), 1 M dilute hydrochloric acid is used to adjust the material synthesis pH to 2, 3, 4, and 5, and the others are the same as Example 1.

[0061] See the experimental results image 3 The synthesis pH affects the crystal nucleation and growth rate of the catalyst. Under the optimal pH of 4, the complete degradation of sulfamethoxazole can be achieved within 30 min, and has obvious kinetic advantages.

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Abstract

The invention discloses a preparation method and application of a bimetallic Prussian blue analogue catalyst. According to the catalyst, a surfactant, potassium ferricyanide and rare earth metal cerium salt are used as precursors, and a bimetal Prussian blue analogue structure rich in unsaturated active sites is grown by adopting a one-step method through regulation and control of parameters such as time, pH (Potential of Hydrogen), a solvent and temperature; by adopting the catalyst, hydrogen peroxide can be efficiently activated and refractory organic matters in water can be removed under visible light and near-neutral conditions; furthermore, the catalyst gives full play to the multi-effect synergistic effect of unsaturated active sites, photon-generated carriers and bimetallic redox pairs, and successfully overcomes the problems of slow iron circulation rate, low hydrogen peroxide utilization rate and the like in the traditional Fenton oxidation process; besides, the catalyst is prepared from iron salt and cerium salt which are rich in reserves and low in cost through a one-step method, has the advantages of being high in activity and stability, environmentally friendly and the like, and is wide in application prospect.

Description

technical field [0001] The invention relates to the field of environmental functional materials and applications thereof, in particular to a preparation method and application of a bimetallic Prussian blue analog catalyst. Background technique [0002] Refractory organic matter in wastewater has complex components, a large amount, and a wide range of sources, and most of them have three effects, which can damage the human nervous and endocrine systems. Due to its refractory, strong toxicity and easy bioaccumulation, it is of great significance to use high-efficiency, low-consumption and environmentally friendly treatment technologies to remove refractory organics in water. [0003] Advanced oxidation technology can generate highly reactive species under environmental pressure, and efficiently remove and mineralize organic pollutants that are difficult to treat with traditional technologies. Among them, Fenton technology can activate hydrogen peroxide to generate a large numb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/26B01J37/03C02F1/72C02F101/30C02F101/38C02F101/34
CPCB01J27/26B01J35/004B01J37/03C02F1/725C02F1/722C02F2101/30C02F2101/305C02F2101/308C02F2101/40C02F2101/38C02F2101/34Y02W10/37
Inventor 刘福强郑文婷郑豪杜志玲李爱民
Owner NANJING UNIV
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