CN103638923A - Rare earth element Nd-doped Bi2WO6 composite photocatalyst, preparation method therefor and applications thereof - Google Patents

Rare earth element Nd-doped Bi2WO6 composite photocatalyst, preparation method therefor and applications thereof Download PDF

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CN103638923A
CN103638923A CN201310415216.XA CN201310415216A CN103638923A CN 103638923 A CN103638923 A CN 103638923A CN 201310415216 A CN201310415216 A CN 201310415216A CN 103638923 A CN103638923 A CN 103638923A
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rare earth
earth element
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CN103638923B (en
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谈国强
黄靖
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Yancheng Heye Industrial Investment Co.,Ltd.
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Shaanxi University of Science and Technology
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Abstract

Provided is a rare earth element Nd-doped Bi2WO6 composite photocatalyst, a preparation method therefor and applications thereof. Bismuth nitrate pentahydrate and sodium tungstate dihydrate are dissolved in water respectively and the molar ratio of Bi to W is 2:1. After the mixture is stirred uniformly, neodymium nitrate hexahydrate is added, and the content of Nd is as follows: RNd is equal to 2%-20%, and RNd is equal to nNd/(nBi+nNd)*100%. The mixture is stirred unceasingly and a precursor solution is obtained; a Nd-doped Bi2WO6 composite photocatalyst is prepared through a microwave hydrothermal method with a power of 300W at the temperature of 160-220 DEG C after thermal insulation for 30-120min. The main component is orthorhombic Bi2WO6, and the Bi2WO6 contains Nd<+3>. The method combines advantages of microwave and hydrothermal methods, the technology is simple and easy to control, the preparation cycle is short, energy is saved, the composite photocatalyst obtained from one step synthesis has excellent photocatalytic activity and can be used for degrading organics.

Description

A kind of rare earth element nd doping Bi 2wO 6composite photo-catalyst and its preparation method and application
Technical field
The invention belongs to field of functional materials, relate to a kind of rare earth element nd doping Bi 2wO 6composite photo-catalyst and its preparation method and application.
Background technology
Along with modern civilization and scientific and technological develop rapidly, environmental pollution is more and more serious, Environmental Pollution and Control has become the important topic of global common concern, and in nearly twenty or thirty year, the mankind's problem of curbing environmental pollution that develops into of Photocatalyst provides an effective approach.At present, the searching of novel visible responsive photocatalyst is showed to desirability and urgency.
Bismuth tungstate has following characteristics as a kind of novel photocatalyst: the Uv and visible light response that (1) is good; (2) thermally-stabilised; (3) photocatalysis is stable; (4) cost is relatively low; (5) environmental friendliness.Therefore, Bi 2wO 6the research and development of catalysis material, will, for improving solar energy utilization ratio, have potential practical value aspect the depollution of environment and new energy development.But also just because of its energy gap relative narrower increases the recombination probability in light induced electron-hole, reduced the efficiency of light quantum, thereby had influence on Bi simultaneously 2wO 6photocatalysis performance.
Rare earth is because its special electron structure has the incomparable spectral characteristic of general element, and the rare earth atom of 4f shell or the 4f electronics of the compound that ion forms with underfill can be in the generation transition between f-f configuration or between f-d configuration.Therefore, rare-earth metal doped ion is the focus beginning one's study in recent years.Some rare earth oxide itself is also hopeful to use as photochemical catalyst, but generally speaking, the simple rare earth oxide of usining carries out considerably lessly as the research of photochemical catalyst.And doping content also has a great impact reactivity, there is an optimum concentration value, conventionally low concentration is useful, high concentration is unfavorable for the carrying out of reaction, doping can cause the destruction of crystal structure too much, thereby make catalyst lose catalytic performance, and doping is often difficult to play the effect that regulates and change its band structure very little.
In recent years, adopted hydrothermal method to prepare Bi 2wO 6nanocrystal becomes a focus of research.Yet, in traditional hydrothermal synthesis method, adopt often common conduction, the shortcoming such as this mode of heating has that the rate of heat addition is slow, reaction time length, heat skewness, thermograde are large, has had a strong impact on character, particle scale of synthetic powder etc.Microwave-hydrothermal method is usingd microwave as mode of heating, a kind of new method of preparing nano-powder in conjunction with traditional hydro-thermal method, be suitable for being generalized in large-scale industrial production and go, in the fields such as nano materials, ceramic material, shown good development momentum and wide application prospect.
Summary of the invention
The object of the present invention is to provide a kind of rare earth element nd doping Bi 2wO 6composite photo-catalyst and its preparation method and application, this preparation method's reaction time is short, and technological process is simple, the Nd doping Bi making 2wO 6composite photo-catalyst possesses good photocatalytic activity.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, comprises the following steps:
Step 1: by Bi (NO 3) 35H 2o and Na 2wO 42H 2o puts into container according to the mol ratio of Bi:W=2:1, then adds water to be mixed with mixed solution in container, and mixed solution is stirred;
Step 2: by Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=2%-20%, R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndthe mole that is respectively Bi and Nd, at room temperature stirs reactant liquor, obtains precursor liquid;
Step 3: precursor liquid is moved in microwave hydrothermal reaction kettle, then microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, stops reaction at 160 ℃-220 ℃ after being incubated 30min-120min;
Step 4: question response temperature is down to after room temperature, takes out microwave hydrothermal reaction kettle, isolates sediment wherein, then by sediment washing, ultrasonic dispersion, freeze-day with constant temperature, obtains rare earth element nd doping Bi 2wO 6composite photo-catalyst.
Bi (NO in the mixed solution of described step 1 3) 35H 2the concentration of O is 0.1mol/L-0.6mol/L, Na 2wO 42H 2the concentration of O is 0.05mol/L-0.3mol/L.
The required time that stirs in described step 2 is 20-40min.
In described step 3, set microwave reaction instrument and be warming up to 100 ℃ from room temperature, 50 ℃ of insulation 8min of every intensification from 100 ℃, until temperature is raised to 160 ℃-220 ℃.
In described step 3, the packing ratio of microwave hydrothermal reaction kettle is 40%-70%, and the liner of microwave hydrothermal reaction kettle is polytetrafluoroethylene (PTFE) material.
Washing in described step 4 is respectively sediment washing to be repeatedly to neutral to sediment with deionized water and absolute ethyl alcohol, and after each washing, through the natural sedimentation of a day, carries out next time again and wash.
The time of the ultrasonic dispersion in described step 4 is 30-60min.
The baking temperature of the freeze-day with constant temperature in described step 4 is 75-85 ℃, and be 12-24 hour drying time.
Described rare earth element nd doping Bi 2wO 6the rare earth element nd doping Bi that the preparation method of composite photo-catalyst makes 2wO 6composite photo-catalyst, its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=2%-20%, and its pattern is for to be self-assembled into flower type structure by nanometer sheet.
Described rare earth element nd doping Bi 2wO 6the rare earth element nd doping Bi that the preparation method of composite photo-catalyst makes 2wO 6the application of composite photo-catalyst aspect degradation of organic substances.
Compared with prior art, the present invention has following beneficial effect:
Rare earth element nd doping Bi provided by the invention 2wO 6the preparation method of composite photo-catalyst, with five water bismuth nitrate (Bi (NO 3) 35H 2o) be Bi source, tungstate dihydrate acid sodium (Na 2wO 42H 2o) be W source, according to the mol ratio of Bi:W=2:1 by its preparation Bi soluble in water 2wO 6, then add six water neodymium nitrate (Nd (NO 3) 36H 2o), to Bi 2wO 6carry out Nd 3+doping, by microwave-hydrothermal method by Nd 3+introduce Bi 2wO 6in, prepare rare earth element nd doping Bi 2wO 6composite photo-catalyst, has improved pure Bi 2wO 6the efficiency of photocatalysis to degrade organic matter under visible ray.The microwave-hydrothermal method that the present invention adopts combines the heat characteristic of microwave uniqueness and the advantage of hydro-thermal method, do not need to add other additive, one-step synthesis product, reaction speed is fast, generated time is short, reaction condition is gentle, reaction efficiency is high, environmental friendliness, technique is simple and easy to control, manufacturing cycle is short, save the energy.
Rare earth element nd doping Bi provided by the invention 2wO 6composite photo-catalyst is orthorhombic phase structure, and pattern is regular, purity is higher, has visible light-responded performance, is a kind of visible light responsible photocatalytic material with high catalytic activity, and its main component is Bi 2wO 6, and Bi 2wO 6in contain Nd 3+, its pattern is for being self-assembled into the structure of class flower type by nanometer sheet.Rare earth element nd doping Bi provided by the invention 2wO 6composite photo-catalyst has good visible light photocatalysis active, and the photocatalytic activity under its visible ray is apparently higher than the not doping Bi making under the same terms 2wO 6photocatalytic activity, improved pure phase Bi 2wO 6the problem that catalytic efficiency is low, can be used in degradation of organic substances, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the rare earth element nd doping Bi of the embodiment of the present invention 2 preparations 2wO 6the XRD figure of composite photo-catalyst;
Fig. 2 is the rare earth element nd doping Bi of the embodiment of the present invention 2 preparations 2wO 6the SEM figure of composite photo-catalyst, wherein the multiplication factor of a is 30k times, the multiplication factor of b is 100k times;
Fig. 3 is rare earth element nd doping Bi prepared by the present invention 2wO 6the degradation rate curve map of composite photo-catalyst, wherein a is the Bi while undoping 2wO 6degradation rate curve, b is the rare earth element nd doping Bi of embodiment 2 preparation 2wO 6the degradation rate curve of composite photo-catalyst.
The specific embodiment
Below in conjunction with accompanying drawing and the preferred embodiment of the invention, the present invention is described further, it is pure that raw material is analysis.
Embodiment 1:
Rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, comprises the following steps:
Step 1: take Bi (NO according to the mol ratio of Bi:W=2:1 3) 35H 2o and Na 2wO 42H 2o puts into beaker, then adds deionized water to be mixed with mixed solution in beaker, wherein Bi (NO 3) 35H 2the concentration of O is 0.2mol/L, Na 2wO 42H 2the concentration of O is 0.1mol/L, and magnetic agitation mixed solution 40min mixes raw material wherein;
Step 2: take a certain amount of Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=6%(R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndbe respectively the mole of Bi and Nd), reactant liquor is at room temperature obtained to precursor liquid after magnetic agitation 40min;
Step 3: precursor liquid is moved in teflon-lined microwave hydrothermal reaction kettle, the packing ratio of controlling microwave hydrothermal reaction kettle is 40%, again microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, from room temperature, be warming up to 100 ℃, 50 ℃ of every intensifications insulation 8min from 100 ℃, until temperature is raised to 180 ℃, stop reaction after being incubated 90min at 180 ℃;
Step 4: question response temperature is down to after room temperature, take out microwave hydrothermal reaction kettle, isolate sediment wherein, with deionized water and absolute ethyl alcohol, respectively sediment washing is repeatedly after neutrality and (after each washing, through the natural sedimentation of a day, carries out washing next time again) to sediment, ultrasonic dispersion 60min again, 80 ℃ of freeze-day with constant temperature 12 hours, obtain rare earth element nd doping Bi again 2wO 6composite photo-catalyst.
The rare earth element nd doping Bi making 2wO 6composite photo-catalyst, its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=6%, and its pattern is for being self-assembled into the structure of class flower type by nanometer sheet.
Embodiment 2:
Rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, comprises the following steps:
Step 1: take Bi (NO according to the mol ratio of Bi:W=2:1 3) 35H 2o and Na 2wO 42H 2o puts into beaker, then adds 60ml deionized water to be mixed with mixed solution in beaker, wherein Bi (NO 3) 35H 2the concentration of O is 0.1mol/L, Na 2wO 42H 2the concentration of O is 0.05mol/L, and magnetic agitation mixed solution 40min mixes raw material wherein;
Step 2: take a certain amount of Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=10%(R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndbe respectively the mole of Bi and Nd), reactant liquor is at room temperature obtained to precursor liquid after magnetic agitation 40min;
Step 3: precursor liquid is moved in teflon-lined microwave hydrothermal reaction kettle, the packing ratio of controlling microwave hydrothermal reaction kettle is 60%, again microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, from room temperature, be warming up to 100 ℃, 50 ℃ of every intensifications insulation 8min from 100 ℃, until temperature is raised to 200 ℃, stop reaction after being incubated 120min at 200 ℃;
Step 4: question response temperature is down to after room temperature, take out microwave hydrothermal reaction kettle, isolate sediment wherein, with deionized water and absolute ethyl alcohol, respectively sediment washing is repeatedly after neutrality and (after each washing, through the natural sedimentation of a day, carries out washing next time again) to sediment, ultrasonic dispersion 60min again, 80 ℃ of freeze-day with constant temperature 12 hours, obtain rare earth element nd doping Bi again 2wO 6composite photo-catalyst.
The rare earth element nd doping Bi making 2wO 6composite photo-catalyst, its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=10%, and its pattern is for being self-assembled into the structure of class flower type by nanometer sheet.
Fig. 1 is the rare earth element nd doping Bi of the embodiment of the present invention 2 preparations 2wO 6the XRD figure of composite photo-catalyst, as can be seen from the figure, the Nd Bi that adulterates 2wO 6all diffraction maximums of composite photo-catalyst are consistent with PDF card (JCPDS NO.39-0256), are quadrature phase Bi 2wO 6structure, other impurity phases are not introduced in the doping of Nd.
Fig. 2 is the rare earth element nd doping Bi of the embodiment of the present invention 2 preparations 2wO 6the SEM figure of composite photo-catalyst, as can be seen from the figure, the Nd of the preparation Bi that adulterates 2wO 6composite photo-catalyst consists of nanometer sheet, and these nanometer sheet are self-assembled into the structure of class floweriness type.
Fig. 3 is rare earth element nd doping Bi prepared by the present invention 2wO 6the degradation rate curve of composite photo-catalyst, in figure, a, b curve are respectively unadulterated Bi 2wO 6rare earth element nd doping Bi with embodiment 2 preparations 2wO 6the degradation rate curve of composite photo-catalyst to organic degradation thing rhodamine B, ordinate A/A 0for concentration and the ratio of its initial concentration, the wherein unadulterated Bi after certain rhodamine B degraded constantly 2wO 6be according to method of the present invention, Nd (NO undopes in step 2 3) 36H 2o obtains.As can be seen from the figure, the rare earth element nd doping Bi of embodiment 2 preparations 2wO 6composite photo-catalyst has very high photocatalysis performance, has obviously improved the degradation rate of rhodamine B, and during 90min, its degradation rate, by 60% being increased to 90% when undoping, illustrates rare earth element nd doping Bi provided by the invention 2wO 6composite photo-catalyst has good visible light photocatalysis active, can be used in degradation of organic substances.。
Embodiment 3
Rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, comprises the following steps:
Step 1: take Bi (NO according to the mol ratio of Bi:W=2:1 3) 35H 2o and Na 2wO 42H 2o puts into beaker, then adds deionized water to be mixed with mixed solution in beaker, wherein Bi (NO 3) 35H 2the concentration of O is 0.6mol/L, Na 2wO 42H 2the concentration of O is 0.3mol/L, and magnetic agitation mixed solution 40min mixes raw material wherein;
Step 2: take a certain amount of Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=15%(R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndbe respectively the mole of Bi and Nd), reactant liquor is at room temperature obtained to precursor liquid after magnetic agitation 20min;
Step 3: precursor liquid is moved in teflon-lined microwave hydrothermal reaction kettle, the packing ratio of controlling microwave hydrothermal reaction kettle is 70%, again microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, from room temperature, be warming up to 100 ℃, 50 ℃ of every intensifications insulation 8min from 100 ℃, until temperature is raised to 220 ℃, stop reaction after being incubated 60min at 220 ℃;
Step 4: question response temperature is down to after room temperature, take out microwave hydrothermal reaction kettle, isolate sediment wherein, with deionized water and absolute ethyl alcohol, respectively sediment washing is repeatedly after neutrality and (after each washing, through the natural sedimentation of a day, carries out washing next time again) to sediment, ultrasonic dispersion 30min again, 75 ℃ of freeze-day with constant temperature 24 hours, obtain rare earth element nd doping Bi again 2wO 6composite photo-catalyst.
The rare earth element nd doping Bi making 2wO 6composite photo-catalyst, its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=15%, and its pattern is for being self-assembled into the structure of class flower type by nanometer sheet.
Embodiment 4
Rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, comprises the following steps:
Step 1: take Bi (NO according to the mol ratio of Bi:W=2:1 3) 35H 2o and Na 2wO 42H 2o puts into beaker, then adds deionized water to be mixed with mixed solution in beaker, wherein Bi (NO 3) 35H 2the concentration of O is 0.4mol/L, Na 2wO 42H 2the concentration of O is 0.2mol/L, and magnetic agitation mixed solution 40min mixes raw material wherein;
Step 2: take a certain amount of Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=18%(R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndbe respectively the mole of Bi and Nd), reactant liquor is at room temperature obtained to precursor liquid after magnetic agitation 40min;
Step 3: precursor liquid is moved in teflon-lined microwave hydrothermal reaction kettle, the packing ratio of controlling microwave hydrothermal reaction kettle is 50%, again microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, from room temperature, be warming up to 100 ℃, 50 ℃ of every intensifications insulation 8min from 100 ℃, until temperature is raised to 160 ℃, stop reaction after being incubated 30min at 160 ℃;
Step 4: question response temperature is down to after room temperature, take out microwave hydrothermal reaction kettle, isolate sediment wherein, with deionized water and absolute ethyl alcohol, respectively sediment washing is repeatedly after neutrality and (after each washing, through the natural sedimentation of a day, carries out washing next time again) to sediment, ultrasonic dispersion 40min again, 85 ℃ of freeze-day with constant temperature 12 hours, obtain rare earth element nd doping Bi again 2wO 6composite photo-catalyst.
The rare earth element nd doping Bi making 2wO 6composite photo-catalyst, its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=18%, and its pattern is for being self-assembled into the structure of class flower type by nanometer sheet.
Embodiment 5
Rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, comprises the following steps:
Step 1: take Bi (NO according to the mol ratio of Bi:W=2:1 3) 35H 2o and Na 2wO 42H 2o puts into beaker, then adds deionized water to be mixed with mixed solution in beaker, wherein Bi (NO 3) 35H 2the concentration of O is 0.3mol/L, Na 2wO 42H 2the concentration of O is 0.15mol/L, and magnetic agitation mixed solution 40min mixes raw material wherein;
Step 2: take a certain amount of Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=2%(R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndbe respectively the mole of Bi and Nd), reactant liquor is at room temperature obtained to precursor liquid after magnetic agitation 30min;
Step 3: precursor liquid is moved in teflon-lined microwave hydrothermal reaction kettle, the packing ratio of controlling microwave hydrothermal reaction kettle is 55%, again microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, from room temperature, be warming up to 100 ℃, 50 ℃ of every intensifications insulation 8min from 100 ℃, until temperature is raised to 190 ℃, stop reaction after being incubated 50min at 190 ℃;
Step 4: question response temperature is down to after room temperature, take out microwave hydrothermal reaction kettle, isolate sediment wherein, with deionized water and absolute ethyl alcohol, respectively sediment washing is repeatedly after neutrality and (after each washing, through the natural sedimentation of a day, carries out washing next time again) to sediment, ultrasonic dispersion 50min again, 80 ℃ of freeze-day with constant temperature 16 hours, obtain rare earth element nd doping Bi again 2wO 6composite photo-catalyst.
The rare earth element nd doping Bi making 2wO 6composite photo-catalyst, its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=2%, and its pattern is for being self-assembled into the structure of class flower type by nanometer sheet.
Embodiment 6
Rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, comprises the following steps:
Step 1: take Bi (NO according to the mol ratio of Bi:W=2:1 3) 35H 2o and Na 2wO 42H 2o puts into beaker, then adds deionized water to be mixed with mixed solution in beaker, wherein Bi (NO 3) 35H 2the concentration of O is 0.5mol/L, Na 2wO 42H 2the concentration of O is 0.25mol/L, and magnetic agitation mixed solution 40min mixes raw material wherein;
Step 2: take a certain amount of Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=20%(R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndbe respectively the mole of Bi and Nd), reactant liquor is at room temperature obtained to precursor liquid after magnetic agitation 40min;
Step 3: precursor liquid is moved in teflon-lined microwave hydrothermal reaction kettle, the packing ratio of controlling microwave hydrothermal reaction kettle is 65%, again microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, from room temperature, be warming up to 100 ℃, 50 ℃ of every intensifications insulation 8min from 100 ℃, until temperature is raised to 170 ℃, stop reaction after being incubated 100min at 170 ℃;
Step 4: question response temperature is down to after room temperature, take out microwave hydrothermal reaction kettle, isolate sediment wherein, with deionized water and absolute ethyl alcohol, respectively sediment washing is repeatedly after neutrality and (after each washing, through the natural sedimentation of a day, carries out washing next time again) to sediment, ultrasonic dispersion 45min again, 75 ℃ of freeze-day with constant temperature 20 hours, obtain rare earth element nd doping Bi again 2wO 6composite photo-catalyst.
The rare earth element nd doping Bi making 2wO 6composite photo-catalyst, its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=20%, and its pattern is for being self-assembled into the structure of class flower type by nanometer sheet.
The foregoing is only one embodiment of the present invention, it not whole or unique embodiment, the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading description of the present invention, is claim of the present invention and contains.

Claims (10)

1. rare earth element nd doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that, comprises the following steps:
Step 1: by Bi (NO 3) 35H 2o and Na 2wO 42H 2o puts into container according to the mol ratio of Bi:W=2:1, then adds water to be mixed with mixed solution in container, and mixed solution is stirred;
Step 2: by Nd (NO 3) 36H 2o joins in mixed solution, obtains reactant liquor, wherein the addition R of Nd nd=2%-20%, R nd=n nd/ (n bi+ n nd) * 100%, n biand n ndthe mole that is respectively Bi and Nd, at room temperature stirs reactant liquor, obtains precursor liquid;
Step 3: precursor liquid is moved in microwave hydrothermal reaction kettle, then microwave hydrothermal reaction kettle is put into microwave hydrothermal reaction, setting power is 300W, stops reaction at 160 ℃-220 ℃ after being incubated 30min-120min;
Step 4: question response temperature is down to after room temperature, takes out microwave hydrothermal reaction kettle, isolates sediment wherein, then by sediment washing, ultrasonic dispersion, freeze-day with constant temperature, obtains rare earth element nd doping Bi 2wO 6composite photo-catalyst.
2. rare earth element nd according to claim 1 doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that: Bi (NO in the mixed solution of described step 1 3) 35H 2the concentration of O is 0.1mol/L-0.6mol/L, Na 2wO 42H 2the concentration of O is 0.05mol/L-0.3mol/L.
3. rare earth element nd according to claim 1 and 2 doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that: the required time that stirs in described step 2 is 20-40min.
4. rare earth element nd according to claim 1 and 2 doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that: in described step 3, set microwave reaction instrument and be warming up to 100 ℃ from room temperature, 50 ℃ of insulation 8min of every intensification from 100 ℃, until temperature is raised to 160 ℃-220 ℃.
5. rare earth element nd according to claim 1 and 2 doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that: in described step 3, the packing ratio of microwave hydrothermal reaction kettle is 40%-70%, and the liner of microwave hydrothermal reaction kettle is polytetrafluoroethylene (PTFE) material.
6. rare earth element nd according to claim 1 and 2 doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that: the washing in described step 4 is respectively sediment washing to be repeatedly to neutral to sediment with deionized water and absolute ethyl alcohol, and after each washing, through the natural sedimentation of a day, carries out next time again and wash.
7. rare earth element nd according to claim 1 and 2 doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that: the time of the ultrasonic dispersion in described step 4 is 30-60min.
8. rare earth element nd according to claim 1 and 2 doping Bi 2wO 6the preparation method of composite photo-catalyst, is characterized in that: the baking temperature of the freeze-day with constant temperature in described step 4 is 75-85 ℃, and be 12-24 hour drying time.
9. according to the rare earth element nd doping Bi described in any one in claim 1-8 2wO 6the rare earth element nd doping Bi that the preparation method of composite photo-catalyst makes 2wO 6composite photo-catalyst, is characterized in that: its main component is the Bi of quadrature phase 2wO 6, and Bi 2wO 6in contain Nd 3+, wherein the content of Nd is R nd=2%-20%, and its pattern is for to be self-assembled into flower type structure by nanometer sheet.
10. according to the rare earth element nd doping Bi described in any one in claim 1-8 2wO 6the rare earth element nd doping Bi that the preparation method of composite photo-catalyst makes 2wO 6the application of composite photo-catalyst aspect degradation of organic substances.
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CN104785260A (en) * 2015-04-24 2015-07-22 上海电力学院 Visible-light-driven photocatalyst for catalytic conversion of methane, as well as preparation method and application thereof
CN105170157A (en) * 2015-09-21 2015-12-23 中国计量学院 Neodymium-doped bismuth ferrite nanometer photocatalyst and preparation method thereof
CN106238038A (en) * 2016-08-09 2016-12-21 桂林电子科技大学 The preparation of a kind of neodymium-doped tungstic acid bismuth photocatalyst and application thereof
CN107185521A (en) * 2017-05-19 2017-09-22 盐城工学院 A kind of catalysis material and preparation method thereof
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CN108479759A (en) * 2018-04-24 2018-09-04 吉林建筑大学 A kind of visible-light response type La doped wolframic acid bismuth catalyst and preparation method thereof
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