CN103721701B - A kind of novel nido bismuth oxide photocatalyst and preparation method thereof - Google Patents
A kind of novel nido bismuth oxide photocatalyst and preparation method thereof Download PDFInfo
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- CN103721701B CN103721701B CN201410025678.5A CN201410025678A CN103721701B CN 103721701 B CN103721701 B CN 103721701B CN 201410025678 A CN201410025678 A CN 201410025678A CN 103721701 B CN103721701 B CN 103721701B
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- bismuth oxide
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Abstract
The invention discloses a kind of novel nido bismuth oxide photocatalyst and preparation method thereof.Photochemical catalyst of the present invention is nido; Described bismuth oxide is the nano particle of monocline alpha-crystal form, and particle size is 400 ~ 800nm.The bismuth oxide that the present invention prepares has higher photocatalytic activity, and product stable, to recycle efficiency higher.
Description
Technical field
The present invention relates to a kind of photochemical catalyst, be specifically related to a kind of nido bismuth oxide photocatalyst and preparation method thereof.
Background technology
In recent years, adopt semi-conductor nano particles photocatalytic method to curb environmental pollution thing, day by day come into one's own.Theoretically, as long as the luminous energy of semiconductor absorber is greater than its energy gap, can be enough to vitalizing semiconductor and produce electronics and hole, this semiconductor just likely uses photocatalyst.Owing to relating to the many factors such as material cost, chemical stability, anti-light corrosive power and light matching performance, real practical material is still needed optimizing research.
Common single photochemical catalyst mostly is metal oxide or sulfide, as TiO
2, WO
3, CdS etc.TiO
2become study hotspot, but due to its greater band gap (3.2eV), absorbing wavelength can only be less than the ultraviolet light of 420nm, absorbing ability is low, and quantum efficiency is lower, how to improve its catalytic efficiency and is still important subject.Bi system oxide is the important functional material of a class, all has extensive use, such as: as electron ceramic material, electrolyte, high temperature superconducting materia, catalyst etc. in a lot of field.Thus cause the very big concern of physics, chemistry and material supply section scholars.Bismuth tungstate, bismuth phosphate, chlorine oxygen bismuth etc. are all available catalysis materials, and semiconductor Bi
2o
3band-gap energy be 2.8eV, absorbing wavelength is longer, under visible light can catalyzing and degrading pollutant.Tradition is prepared bismuth oxide and is adopted solid phase reaction, and the product particles radius of acquisition is large, reunion is serious, pattern is irregular.
Summary of the invention
The object of the invention is to solve the defect existed in prior art, providing a kind of particle size more even, the bismuth oxide photocatalyst that photocatalytic activity is high.
In order to achieve the above object, the invention provides a kind of novel nido bismuth oxide photocatalyst, this photochemical catalyst is nido; Bismuth oxide is the nano particle of monocline alpha-crystal form, and particle size is 400 ~ 800nm.
Present invention also offers the preparation method of above-mentioned photochemical catalyst, comprise the following steps:
(1) get 30mL PEG400, under stirring, add 0.6 ~ 1g five water bismuth nitrate;
(2) 0.5 ~ 1.8gPVP(polyvinylpyrrolidone is added again), after stirring, at 1 ~ 6Mpa, hydro-thermal reaction 20 ~ 25h at 120 ~ 180 DEG C;
(3) after having reacted, through centrifugal, dry, calcine and obtain described photochemical catalyst.
Wherein, hydro-thermal reaction time preferred 24h in step (2).In step (3), calcination process is preferably roasting 2h at 400 ~ 600 DEG C.
The present invention has the following advantages compared to existing technology: the present invention adopts hydro-thermal method to prepare photochemical catalyst, and preparation method is simple, and controllability is good, and the particle diameter prepared is little, degree of crystallinity is high.The bismuth oxide photocatalyst that the present invention prepares be velvet-like nano particle composition, in nest like, particle size less evenly; And prepared bismuth oxide is the alpha-crystal form of monocline, there is good photocatalytic activity.The bismuth oxide that the present invention prepares has higher photocatalytic activity, and product stable, to recycle efficiency higher.
Accompanying drawing explanation
Fig. 1 is the XRD figure of the photochemical catalyst that the present invention prepares;
Fig. 2 is the SEM figure of the photochemical catalyst that the present invention prepares;
Fig. 3 is the photocatalytic activity comparison diagram of the photochemical catalyst for preparing of the present invention and general commercial bismuth oxide.
In Fig. 3,1-general commercial bismuth oxide, the photochemical catalyst that 2-the present invention prepares.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
embodiment one
Under room temperature, the PEG400 getting 30mL is poured in beaker, the five water bismuth nitrates of 0.6g are added under magnetic agitation condition, add the PVP of 0.5g again, abundant stirring is after 1 hour, proceed in the autoclave of 40mL, at 180 DEG C, carry out hydro-thermal reaction 20h, centrifugal, washing, dry, namely roasting obtain photochemical catalyst of the present invention.
embodiment two
Under room temperature, the PEG400 getting 30mL is poured in beaker, the five water bismuth nitrates of 1g are added under magnetic agitation condition, add the PVP of 1.8g again, abundant stirring is after 1 hour, proceed in the autoclave of 40mL, at 120 DEG C, carry out hydro-thermal reaction 25h, centrifugal, washing, dry, namely roasting obtain photochemical catalyst of the present invention.
implement three
Under room temperature, the PEG400 getting 30mL is poured in beaker, the five water bismuth nitrates of 0.8g are added under magnetic agitation condition, add the PVP of 1.2g again, abundant stirring is after 1 hour, proceed in the autoclave of 40mL, at 160 DEG C, carry out hydro-thermal reaction 24h, centrifugal, washing, dry, namely roasting obtain photochemical catalyst of the present invention.
Get the photochemical catalyst prepared and carry out X-ray diffraction analysis, as can be seen from Figure 1, what the present invention prepared is pure phase bismuth oxide, and is shown as the alpha-crystal form of monocline according to its XRD standard card 71-2274.
Observe under a scanning electron microscope, as shown in Figure 2, the photochemical catalyst that the present invention prepares is nido, Nano grade, particle size uniformity.
effect example
Get photochemical catalyst 2 and general commercial bismuth oxide 1 prepared by 0.1g the present invention respectively, add in 200mL rhodamine B solution (10mg/L) respectively, lucifuge stirs 30min, then react under full light illumination, get 3mL reactant liquor every 5 minutes, after centrifugation, get supernatant liquor, detect the change of rhodamine B characteristic absorption peak maximum 553nm place absorbance with spectrophotometer, weigh the change in concentration of rhodamine B in solution, draw C/C
0curve over time.Wherein C
0for the initial concentration of Luo Dan Ming B, C penetrates through full exposure the Luo Dan Ming B concentration value that certain hour t measurement obtains.
As can be seen from Figure 3, rhodamine B, much larger than general commercial bismuth oxide, can be degraded more than 80% at about 40 minutes ， Testis shape bismuth oxides by the activity of the nido bismuth oxide that the present invention prepares, and the degraded of general commercial bismuth oxide is less than 20%.
Claims (3)
1. a nido bismuth oxide photocatalyst, is characterized in that: described photochemical catalyst is nido; Described bismuth oxide is the nano particle of monocline alpha-crystal form, and particle size is 400 ~ 800nm; Described photochemical catalyst is prepared by following steps: (1) gets 30mL PEG400, adds 0.6 ~ 1g five water bismuth nitrate under stirring; (2) 0.5 ~ 1.8gPVP is added again, after stirring,
1~ 6Mpa, hydro-thermal reaction 20 ~ 25h at 120 ~ 180 DEG C; (3) after having reacted, through centrifugal, dry, calcine and obtain described photochemical catalyst.
2. photochemical catalyst according to claim 1, is characterized in that: in described step (2), the hydro-thermal reaction time is 24h.
3. photochemical catalyst according to claim 1, is characterized in that: in described step (3), calcination process is roasting 2h at 400 ~ 600 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410025678.5A CN103721701B (en) | 2014-01-21 | 2014-01-21 | A kind of novel nido bismuth oxide photocatalyst and preparation method thereof |
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| CN201410025678.5A CN103721701B (en) | 2014-01-21 | 2014-01-21 | A kind of novel nido bismuth oxide photocatalyst and preparation method thereof |
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| CN103721701A CN103721701A (en) | 2014-04-16 |
| CN103721701B true CN103721701B (en) | 2015-12-02 |
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| CN104826623B (en) * | 2015-04-29 | 2017-05-24 | 华南师范大学 | Bismuth oxide photocatalyst, preparation method and applications thereof |
| CN109250755B (en) * | 2018-09-14 | 2021-06-01 | 重庆工商大学 | Bismuth oxide photocatalyst containing different crystal phases with bismuth defects and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787355A (en) * | 2012-09-07 | 2012-11-21 | 江西理工大学 | Method for preparing alpha-Bi2O3 monocrystalline micron rods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2590431B2 (en) * | 1994-03-18 | 1997-03-12 | 科学技術庁無機材質研究所長 | Method for producing Bi5O7 (NO3) |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787355A (en) * | 2012-09-07 | 2012-11-21 | 江西理工大学 | Method for preparing alpha-Bi2O3 monocrystalline micron rods |
Non-Patent Citations (2)
| Title |
|---|
| Microwave-assisted synthesis of hierarchical Bi2O3 sphere sassembled from nanosheets with pore structure;Ming-Guo Ma等;《Materials Letters》;20100410;第64卷;第1524-1527页 * |
| Synthesis and luminescence properties of hand-like α-Bi2O3 microcrystals;Ying Xiong等;《MaterialsLetters》;20070807;第62卷;第1165-1168页 * |
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