A method for magnetic nanospheres to adsorb vanadium oxide quantum dots to degrade rhodamine b

A magnetic nanosphere and magnetic nanoparticle technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of large material size, difficult separation, and the size of metal compounds Large and other problems, to achieve the effect of environmental friendliness, broad market prospects, and ingenious ideas

Active Publication Date: 2022-04-01
QINGDAO UNIV
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  • 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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  • A method for magnetic nanospheres to adsorb vanadium oxide quantum dots to degrade rhodamine b
  • A method for magnetic nanospheres to adsorb vanadium oxide quantum dots to degrade rhodamine b
  • A method for magnetic nanospheres to adsorb vanadium oxide quantum dots to degrade rhodamine b

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Experimental program
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Embodiment 1

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

[0040] S1. Dissolve 1.5g PSSMA 1:1 in 80mL ethylene glycol (with FeCl 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 alcohol solution, then transferred to a 100mL polytetrafluoro-lined reaction kettle, heated to 200°C in a blast drying oven, and maintained for ten hours, collected with a magnet The precipitate was washed three times with ethanol and deionized water, and then freeze-dried for 24 hours;

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

Embodiment 2

[0044] This 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, ultrasonicated for 30 minutes, then added 0.75g polydiallyl ammonium chloride (PDDA), mechanically stirred for 1h and washed to remove excess PDDA; the same method was used to wrap polyphenylene Sodium ethylene sulfonate (PSS), PDDA-modified Fe 3 o 4 @SiO 2 It is represented by the letter FS (PDDA), and the modified PDDA and PSS is represented by the letter FS (P / S). After adsorbing quantum dots, it is represented by the letters VFS (PDDA), VFS (P / S), Figure 5 (A) As shown in the figure, a-h were respectively controlled as follows, and the UV absorbance was measured after 5 minutes of reaction, (a) Rh B; (b) Rh B+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)+H 2 o 2 ; When PDDA is wra...

Embodiment 3

[0048] This embodiment verifies the charge conditions of the silicon dioxide-wrapped iron ferric oxide 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 negatively charged surface to the quantum dots. The potential difference of the surface before and after the adsorption of the magnetic silicon ball is as follows: Figure 4 As shown, it shows that the surface potential of the magnetic silicon sphere wrapped by silica is slightly lower than that of the material without adsorption, and the potential value at pH 1-7 is slightly lower, and the surface of the surface silicon sphere is indeed adsorbed with quantum dots.

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Abstract

The invention belongs to the field of design and degradation application of magnetic composite nanomaterials, and relates to a 2+ / VO 2 + ) and iron ions (Fe 2+ / Fe 3+ ) Fenton-like reaction system designed with a similar charge transfer mechanism, especially the electrostatic adsorption of vanadium oxide quantum dots with opposite charges on magnetic nanomaterials, and using rhodamine B as a dye model to perform Fenton-like reaction degradation. This method can quickly realize the decolorization and degradation of rhodamine B within 30 seconds. Compared with the traditional Fenton reaction, there is no iron sludge precipitation after 12 hours; the vanadium oxide quantum dots supported by magnetic silicon spheres can be recycled, and the magnet inside has no loss; For the first time, the inner ball reaction mechanism was proposed in the degradation of dyes and organic matter, which explained the reason for the rapid realization of this type of Fenton reaction. The preparation method is ingeniously conceived, simple and easy to operate, and can realize rapid decolorization and degradation of rhodamine B within 30 seconds, which provides a new idea for the study of redox research, is environmentally friendly and has broad market prospects.

Description

Technical field: [0001] The invention belongs to the field of design and degradation application of magnetic composite nanomaterials, and relates to a 2+ / VO 2 + ) and iron ions (Fe 2+ / Fe 3+ ) Fenton-like reaction system designed with a similar charge transfer mechanism, especially the electrostatic adsorption of vanadium oxide quantum dots with opposite charges on magnetic nanomaterials, and using rhodamine B as a dye model to perform Fenton-like reaction degradation. Background technique: [0002] H.J.H Fenton proposed that iron acts in a manner commonly called "catalysis" and that a very small amount of iron is sufficient to determine the oxidation of tartaric acid in this direction in almost unlimited quantities, demonstrating that several metals have the property of transporting oxygen, Can increase the efficiency of hydrogen peroxide. To commemorate this discovery, the reaction in which ferrous iron catalyzes the production of hydroxyl radicals from hydrogen pero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/84
CPCC02F1/725C02F1/722B01J23/8472B01J23/002B01J35/0033B01J35/0073A62D3/38B01J2523/00C02F2305/026B01J2523/41B01J2523/55B01J2523/842
Inventor 牛玉生张蒙许元红
Owner QINGDAO UNIV
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