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Method for degrading rhodamine B by adsorbing vanadium oxide quantum dots through magnetic nanospheres

A technology of magnetic nanospheres and vanadium quantum, applied in chemical instruments and methods, oxidized water/sewage treatment, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of large material size, difficult separation, and large specific surface area and other issues, to achieve the effects of environmental friendliness, ingenious ideas, and broad market prospects

Active Publication Date: 2020-05-08
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large amount of ferrous sulfate is added during the oxidation process, which causes a large amount of iron ions in the ferrous sulfate to precipitate, and a large amount of iron sludge is produced.
In the prior art, the use of iron-containing minerals and other transition metals such as Co, Cd, Cu, Ag, Mn, Ni, etc. can accelerate or replace Fe 2+ with H 2 o 2 Play a catalytic role, however, these metal compounds are large in size and have a large relative specific surface area
In the prior art, there is no report on the degradation of magnetic nanomaterials combined with quantum dots. In the published technologies, the Fenton reaction is all based on iron-based material design, and the materials designed for Fenton-like reactions are large in size and difficult to separate.

Method used

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  • Method for degrading rhodamine B by adsorbing vanadium oxide quantum dots through magnetic nanospheres
  • Method for degrading rhodamine B by adsorbing vanadium oxide quantum dots through magnetic nanospheres
  • Method for degrading rhodamine B by adsorbing vanadium oxide quantum dots through magnetic nanospheres

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The preparation of the magnetic ferric oxide involved in the present embodiment and the wrapping of the silicon dioxide layer, the specific synthesis method is carried out according to the steps:

[0040] S1, 1.5g PSSMA was dissolved 1:1 in 80mL ethylene glycol (with FeCl) in a 50°C water bath. 3 ·6H 2 O is the precursor, weigh 1.62g FeCl respectively 3 ·6H 2 O and 4.5g of anhydrous sodium acetate in the above-mentioned alcoholic solution, then transferred to a 100mL polytetrafluoro-lined reaction kettle, heated to 200°C in a blast drying oven, and maintained for ten hours. The precipitate was washed three times with ethanol and deionized water, and then freeze-dried for 24 hours;

[0041] S2. Weigh 50mg ferric oxide nanoparticles and disperse them in 5mL deionized water, then disperse them in a round-bottomed flask equipped with 200mL absolute ethanol and 10mL deionized water to obtain a dispersion, and then ultrasonically treat the above dispersion 15 minutes; the...

Embodiment 2

[0044] The present embodiment verifies the degradation conditions of Rhodamine B, and the specific steps are carried out as follows:

[0045] Weigh 50mg Fe 3 O 4 @SiO 2 Powder, dispersed in 100ml 0.5M NaCl solution, sonicated for 30 minutes, then added 0.75g polydiallyl ammonium chloride (PDDA), mechanically stirred for 1h, washed with water to remove excess PDDA; the same method was used to wrap polyphenylene Sodium ethylene sulfonate (PSS), modified Fe of PDDA 3 O 4 @SiO 2 It is represented by the letters FS (PDDA), and the modified PDDA and PSS are represented by the letters FS (P / S). After the quantum dots are adsorbed respectively, they are represented by the letters VFS (PDDA) and VFS (P / S). Figure 5 (A) As shown in the figure, a-h were controlled as follows, and the UV absorbance was measured after 5 min of reaction, (a) Rh B; (b) RhB+H 2 O 2 ;(c)FS+H 2 O 2 ;(d) VFS+H 2 O 2 ;(e)FS(PDDA)+H 2 O 2 ; (f) VFS(PDDA)+H 2 O 2 ;(g)FS(P / S)+H 2 O 2 ;(h)VFS(P / S) +...

Embodiment 3

[0048] This example verifies the charge conditions of the silica-coated ferric tetroxide and quantum dots in Example 1 and Example 2. The pure quantum dot alcohol solution has a positive charge at pH=2. The charged state of the dots realizes the adsorption of the quantum dots on the negatively charged surface. The potential difference between the magnetic silicon spheres before and after adsorption is as follows: Figure 4 It shows that the surface potential of the silica-wrapped magnetic silicon sphere is slightly lower than that of the material without adsorption, and the potential value at pH 1-7 is slightly lower, and quantum dots are indeed adsorbed on the surface of the surface silicon sphere.

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Abstract

The invention belongs to the field of design and degradation application of magnetic composite nanometer materials, and relates to a Fenton-like reaction system designed by utilizing a charge transfermechanism similar to the charge transfer mechanisms of vanadium oxide ions (VO2<+> / VO<2+>) and iron ions (Fe<2+> / Fe<3+>), particularly to a method for Fenton-like reaction degradation by electrostatically adsorbing vanadium oxide quantum dots with opposite charges on a magnetic nanometer material and taking rhodamine B as a dye model. According to the method, decolorization and degradation of rhodamine B can be rapidly realized within 30 seconds, and compared with a traditional Fenton reaction, no iron mud precipitate is generated in 12 hours; the vanadium oxide quantum dots loaded on magnetic silicon balls can be recycled, and magnets in the magnetic silicon balls are not lost; and an inner sphere reaction mechanism is provided in the aspect of dye and organic matter degradation for thefirst time, and the reason why the Fenton-like reaction is quickly realized is explained. The method is ingenious in conception, simple and easy to operate, capable of achieving rapid decoloration anddegradation of rhodamine B within 30 seconds and providing a new thought for research on redox, environmentally-friendly in application and wide in market prospect.

Description

Technical field: [0001] The invention belongs to the field of design and degradation application of magnetic composite nanomaterials, and relates to a method utilizing vanadium oxide ions (VO 2+ / VO 2 + ) and iron ions (Fe 2+ / Fe 3+ ) Fenton-like reaction system designed with similar charge transfer mechanism, especially the electrostatic adsorption of vanadium oxide quantum dots with opposite charges on magnetic nanomaterials, and the method of Fenton-like reaction degradation with Rhodamine B as the dye model. Background technique: [0002] H.J.H Fenton proposed that iron acts in a manner commonly referred to as "catalysis", that very small amounts of iron are sufficient to determine the oxidation of an almost infinite amount of tartaric acid in this direction, demonstrating that several metals have the property of transporting oxygen, The efficiency of hydrogen peroxide can be increased. In honor of this discovery, the reaction in which ferrous iron catalyzes the gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B01J23/847A62D3/38
CPCC02F1/725C02F1/722B01J23/8472B01J23/002A62D3/38B01J2523/00C02F2305/026B01J35/396B01J35/33B01J2523/41B01J2523/55B01J2523/842
Inventor 牛玉生张蒙许元红
Owner QINGDAO UNIV
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