CN103331173A - Method for preparing CdS/Fe2O3 heterostructure photocatalyst by using ionic liquid and ultrasonic jointly - Google Patents
Method for preparing CdS/Fe2O3 heterostructure photocatalyst by using ionic liquid and ultrasonic jointly Download PDFInfo
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- CN103331173A CN103331173A CN2013102727849A CN201310272784A CN103331173A CN 103331173 A CN103331173 A CN 103331173A CN 2013102727849 A CN2013102727849 A CN 2013102727849A CN 201310272784 A CN201310272784 A CN 201310272784A CN 103331173 A CN103331173 A CN 103331173A
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Abstract
The invention belongs to the field of preparation of an inorganic material iron protoxide (Fe2O3) heterostructure photocatalyst, and particularly relates to a method for preparing a CdS/Fe2O3 heterostructure photocatalyst by using an ionic liquid and ultrasonic jointly. The method can be implemented through the following steps: (1) dropwisely adding diethyl sulfate into a triethylenetetramine water solution, performing neutralization reaction, stirring, and removing water to prepare a triethylenetetramine/diethyl sulfate type ionic liquid; (2) adding iron trichloride into a water/polyethyleneglycol mixed solution, then adding a sodium hydroxide water solution, sealing, heating, separating, drying, and calcining to obtain Fe2O3; and (3) adding iron protoxide, cadmium chloride and thioacetamide into the triethylenetetramine/diethyl sulfate type ionic liquid water solution, performing ultrasonic treatment, and separating to obtain the CdS/Fe2O3 heterostructure. According to the invention, the cadmium sulfide sensitized iron protoxide heterostructure is prepared by using ionic liquid and ultrasonic cooperatively; and the cost is low, the prepared product is high in purity, and mass production can be realized.
Description
Technical field
The invention belongs to inorganic material ferrous oxide (Fe
2O
3) preparation field of heterojunction photocatalyst, relate in particular to the preparation of a kind of ionic liquid and ultrasonic in combination
CdS/Fe 2 O 3 The method of heterojunction photocatalyst.
Background technology
In recent years; how to solve the research focus [Qiu Mingyan that energy crisis and environmental pollution become numerous scholars; Zhang Tianyong; Li Bin etc. material Leader A: a summary piece of writing; 2012; 26 (3): 48-52.], oxygen and hydrone around the light-catalyzed reaction that utilizes ultraviolet or visible light to drive can make are excited into the free radical that has oxidability, and it can decompose most organic pollution also can make hydrogen from water.But existing oxide type photocatalysis effect is relatively poor, only just has photocatalytic activity mostly under ultraviolet light, has seriously hindered the practical application of photochemical catalyst.The visible light catalyst of development of new and existing broad stopband oxide type photochemical catalyst is carried out modification is the effective ways that address this problem, wherein the semiconductor complex technique receives scholar's concern owing to the photocatalytic activity of the right compound raising photochemical catalyst in effective separate electronic hole.
Fe
2O
3Be ferriferous oxide the most stable under the external condition as typical n type semi-conducting material [2.1eV], its band gap width is narrower. have very strong light absorpting ability in the visible region.Nanometer Fe
2O
3Also have good chemical stability and advantage such as nontoxic, inexpensive, thus in catalysis, water treatment, magnetic material, sensor, fields such as lithium ion battery have more application.As its energy gap of photochemical catalyst 2.2eV is only arranged, can more absorption visible light, still, owing to its electron-hole pair difficult separation suppressed its further application as high efficiency photocatalyst.And the synthetic Fe that has
2O
3Hetero-junctions be the effective way that solves this difficult problem.
CdS is promising semiconductor [band gap width is 2.4eV], and its weak point is that photochemical corrosion takes place easily for it, has had a strong impact on its photocatalytic activity.Ideal method is that the semiconductor that finds a kind of band gap to be complementary is compound with it.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art part and a kind of easy operating is provided, and cost is low, purpose product purity height, and the ionic liquid and the ultrasonic in combination that are produced on a large scale prepare CdS/Fe
2O
3The method of heterojunction photocatalyst.
For solving the problems of the technologies described above, the present invention realizes like this.
A kind of ionic liquid and ultrasonic in combination prepare CdS/Fe
2O
3The method of heterojunction photocatalyst can be implemented as follows.
(1) preparation of triethylene tetramine dithyl sulfate type ionic liquid: dithyl sulfate splashed into carry out neutralization reaction in the triethylene tetramine aqueous solution, stir the water of removing in the mixed liquor, make triethylene tetramine dithyl sulfate type ionic liquid.
(2) Fe
2O
3Preparation: ferric trichloride is joined in water and the polyethylene glycol mixed liquor, adds the aqueous solution of NaOH again, after stirring, the sealing, the heating, the product after the separation, drying, the calcining, namely get Fe
2O
3
(3) CdS/Fe
2O
3The preparation of hetero-junctions: preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, ferrous oxide, caddy and thioacetamide are added in the described triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, ultrasonic processing separates namely getting CdS/Fe
2O
3Hetero-junctions.
As a kind of preferred version, in the step of the present invention (1), the mol ratio of described triethylene tetramine and dithyl sulfate is 1～2:1～2.
As another kind of preferred version, in the step of the present invention (2), the addition of described ferric trichloride is 0.47 g～0.6g.
Further, in the step of the present invention (2), heating-up temperature be 180～200 ℃ and the heating time be 4～9h.
Further, in the step of the present invention (2), the product that drying makes is calcined 4～6h down at 400 ℃.Further, in the step of the present invention (3), triethylene tetramine sulfuric acid in the described ionic liquid aqueous solution
The volume ratio of diethylester type ionic liquid and water is 0.14～0.30:1.
Further, in the step of the present invention (3), by quality ratio, described ferrous oxide, caddy and thioacetamide addition are followed successively by: 0.5～1:0.7～0.9:0.22～0.3.
Further, in the step of the present invention (3), the described ultrasonic processing time is 60～90min.
Further, the present invention is through ultrasonic processing and separate afterproduct dry 6h～12h under 80 ℃, namely gets CdS/Fe
2O
3Hetero-junctions.
We studies show that, cadmium sulfide zinc sulphide synthetic in containing the aqueous solution of ionic liquid has higher photocatalytic activity, and find ionic liquid and ultrasonicly have a coupling effect.Ionic liquid and ultrasonic combined preparation small particle diameter nano particle can be given the photocatalytic activity that the heterojunction type photocatalytic agent strengthens.Therefore, adopt ionic liquid and ultrasonic combining to make CdS/Fe
2O
3Obtain splendid photocatalytic activity.
Adopt the synthetic triethylene tetramine dithyl sulfate type ionic liquid of one-step method in the present invention, and utilize this ionic liquid to synthesize CdS/Fe
2O
3The heterojunction type photocatalytic agent, step related in the building-up process is comparatively simple, and the process of its preparation meets the Green Chemistry principle and the hetero-junctions that is synthesized in ionic liquid aqueous solution shows splendid photocatalytic degradation of dye activity.
The present invention adopts ionic liquid and supersonic synergic to prepare the ferrous oxide hetero-junctions of cadmium sulfide sensitization, and simple to operation, cost is low, and the product purity height that makes is expected to produce in enormous quantities.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.Protection scope of the present invention not only is confined to the statement of following content.
Fig. 1 is Fe
2O
3Transmission electron microscope (TEM) photo.
Fig. 2 is the CdS/ Fe of pure water and ultrasonic in combination preparation
2O
3Field emission scanning electron microscope (SEM) photo.
The CdS/Fe that Fig. 3 makes for the inventive method
2O
3Field emission scanning electron microscope (SEM) photo.
Fig. 4 is Fe
2O
3, be the CdS/ Fe of medium preparation with water
2O
3(W) and the CdS/ Fe of the aqueous solution of ionic liquid preparation
2O
3(IL+W) X-ray diffraction (XRD) spectrogram.
Fig. 5 is Fe
2O
3, be the CdS/ Fe of medium preparation with water
2O
3(W) and the CdS/ Fe of the aqueous solution of ionic liquid preparation
2O
3(IL+W) photocatalytic degradation rhodamine B design sketch.
The specific embodiment
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, slowly is added drop-wise in the aqueous solution of triethylene tetramine for the 1:1 dithyl sulfate in molar ratio, stir and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.14:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.5g then, the thioacetamide of 0.7g caddy and 0.22g joins ultrasonic processing 60 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separate and obtain product, flush away impurity, 80 ℃ of following dry 8h can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 2.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.2:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.5 g then, the thioacetamide of 0.7g caddy and 0.22 g joins ultrasonic processing 60 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separate and obtain product, flush away impurity, 80 ℃ of following dry 10h can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 3.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.3:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.5g then, 0.7g the thioacetamide of caddy and 0.22 g joins ultrasonic processing 60 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separates obtaining product, flush away impurity, 80 ℃ of following dry 11h.Can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 4.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.14:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.8 g then, the thioacetamide of 0.7g caddy and 0.22 g joins ultrasonic processing 60 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separate and obtain product, flush away impurity, 80 ℃ of following dry 12h can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 5.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.14:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 1.0g then, 0.7g the thioacetamide of caddy and 0.22 g joins ultrasonic processing 60 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separates obtaining product, flush away impurity, 80 ℃ of following dry 11h.Can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 6.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.14:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.5 g then, 0.8 the thioacetamide of g caddy and 0.26 g joins ultrasonic processing 60 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separates obtaining product, flush away impurity, 80 ℃ of following dry 6h～12h.Can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 7.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.14:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.5 g then, 0.9 the thioacetamide of g caddy and 0.3 g joins ultrasonic processing 60 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separates obtaining product, flush away impurity, 80 ℃ of following dry 6h～12h.Can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 8.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.14:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.5 g then, 0.7g the thioacetamide of caddy and 0.22 g joins ultrasonic processing 80 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separates obtaining product, flush away impurity, 80 ℃ of following dry 6h～12h.Can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
Embodiment 9.
Triethylene tetramine is added dropwise in the 200mL deionized water while stirring, in molar ratio for the dithyl sulfate of 1:1 slowly is added drop-wise in the aqueous solution of triethylene tetramine, stirs and make its generation neutralization reaction.Ice bath is set to prevent in the reaction process because heat release causes solution evaporation, continues to stir 6 hours.Subsequently, the employing Rotary Evaporators steams the water in the mixed liquor, obtains triethylene tetramine dithyl sulfate type ionic liquid.The preparation of ferrous oxide can be as follows: the ferric chloride (FeCl36H2O) of 0.47 g joins in the water of 120 mL and adds the aqueous solution of NaOH of the 2M of 70 mL in the polyethylene glycol of 9 mL, join respectively in the water heating kettle of 100 mL, 180 ℃ are heated 9h down, separate the product that obtains, dry 6h under 80 ℃, in Muffle furnace, calcine 4h again under 400 ℃, can obtain ferrous oxide.Certainly, also can adopt the preparation of other technologies scheme.Be 0.14:1 preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution by volume, being stirred to ionic liquid is dissolved in the water fully, get this solution of 40ml, get the ferrous oxide of 0.5 g then, the thioacetamide of 0.7g caddy and 0.22 g joins ultrasonic processing 90 min in the above-mentioned triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, after reaction finishes, separate and obtain product, flush away impurity, 80 ℃ of following dry 7h can obtain cadmium sulfide sensitization ferrous oxide hetero-junctions.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an ionic liquid and ultrasonic in combination prepare CdS/Fe
2O
3The method of heterojunction photocatalyst is characterized in that, implements as follows:
(1) preparation of triethylene tetramine dithyl sulfate type ionic liquid: dithyl sulfate splashed into carry out neutralization reaction in the triethylene tetramine aqueous solution, stir the water of removing in the mixed liquor, make triethylene tetramine dithyl sulfate type ionic liquid;
(2) Fe
2O
3Preparation: ferric trichloride is joined in water and the polyethylene glycol mixed liquor, adds the aqueous solution of NaOH again, after stirring, sealing, heating, the product after the separation, drying calcining, i.e. Fe
2O
3;
(3) CdS/Fe
2O
3The preparation of hetero-junctions: preparation triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, ferrous oxide, caddy and thioacetamide are added in the described triethylene tetramine dithyl sulfate type ionic liquid aqueous solution, ultrasonic processing separates namely getting CdS/Fe
2O
3Hetero-junctions.
2. prepare CdS/Fe according to the described ionic liquid of claim 1 and ultrasonic in combination
2O
3The method of heterojunction photocatalyst is characterized in that: in the step (1), the mol ratio of described triethylene tetramine and dithyl sulfate is 1～2:1～2.
3. prepare CdS/Fe according to the described ionic liquid of claim 2 and ultrasonic in combination
2O
3The method of heterojunction photocatalyst is characterized in that: in the step (2), the addition of described ferric trichloride is 0.47 g～0.6g.
4. prepare CdS/Fe according to the described ionic liquid of claim 3 and ultrasonic in combination
2O
3The method of heterojunction photocatalyst is characterized in that: in the step (2), heating-up temperature be 180～200 ℃ and the heating time be 4～9h.
5. prepare CdS/Fe according to the described ionic liquid of claim 4 and ultrasonic in combination
2O
3The method of heterojunction photocatalyst is characterized in that: in the step (2), the product that drying makes is calcined 4～6h down at 400 ℃.
6. prepare CdS/Fe according to the described ionic liquid of claim 5 and ultrasonic in combination
2O
3The method of heterojunction photocatalyst is characterized in that: in the step (3), the volume ratio of triethylene tetramine dithyl sulfate type ionic liquid and water is 0.14～0.30:1 in the described ionic liquid aqueous solution.
7. prepare CdS/Fe according to the described ionic liquid of claim 6 and ultrasonic in combination
2O
3The method of heterojunction photocatalyst is characterized in that: in the step (3), by quality ratio, described ferrous oxide, caddy and thioacetamide addition are followed successively by: 0.5～1:0.7～0.9:0.22～0.3.
8. prepare CdS/Fe according to the described ionic liquid of claim 7 and ultrasonic in combination
2O
3The method of heterojunction photocatalyst is characterized in that: in the step (3), the described ultrasonic processing time is 60～90min.
9. described ionic liquid and ultrasonic in combination prepare CdS/Fe according to Claim 8
2O
3The method of heterojunction photocatalyst is characterized in that: dry 6h～12h under 80 ℃ through ultrasonic processing and separation afterproduct namely gets CdS/Fe
2O
3Hetero-junctions.
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