CN105214665A - The recyclable magnetic titanium dioxide photochemical catalyst and preparation method thereof of bisphenol-A in a kind of fast degradation waste water - Google Patents
The recyclable magnetic titanium dioxide photochemical catalyst and preparation method thereof of bisphenol-A in a kind of fast degradation waste water Download PDFInfo
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- CN105214665A CN105214665A CN201510741894.4A CN201510741894A CN105214665A CN 105214665 A CN105214665 A CN 105214665A CN 201510741894 A CN201510741894 A CN 201510741894A CN 105214665 A CN105214665 A CN 105214665A
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Abstract
The invention discloses recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A and preparation method thereof in a kind of fast degradation waste water, preparation method comprises step: (1) prepares magnetic core, and (2) prepare SiO
2intermediate layer and (3) load TiO
2layer; Magnetic titanium dioxide photochemical catalyst comprises magnetic core, and magnetic core is enclosed with intermediate layer SiO
2, intermediate layer SiO
2outer also load has TiO
2layer; Catalyst prepared by the present invention can bisphenol-A in degrading waste water fast and efficiently, the TiO of load
2be mainly the Detitanium-ore-type that catalytic activity is the highest; Utilize externally-applied magnetic field can realize repeatedly effectively reclaiming of catalyst, and keep higher catalytic degradation ability.
Description
Technical field
The invention belongs to catalysis engineering field, particularly the recyclable magnetic titanium dioxide photochemical catalyst and preparation method thereof of bisphenol-A in a kind of fast degradation waste water.
Background technology
Bisphenol-A (bisphenolA, BPA), 2,2-bis-(4-hydroxy phenyl) propane (C
15h
16o
2), be a kind of industrial chemical of Prof. Du Yucang, there is endocrine disruption ability.Can impact the growth of organism, immunity after entering organism, even carcinogenic, harm organism is healthy.American National Environmental Protection Agency, world's Wildlife Fund are organized and are classified as environment incretion interferent (Endocrinedisruptingchemicals, EDCs).Output and the consumption figure of China BPA are huge, and be the commercial synthesis raw material of epoxy resin and Merlon, in its factory effluent, content of bisphenol A is higher, deals with improperly and causes a significant threat to environment.
At present, the method of conventional removal bisphenol-A has the technology such as activated sludge, charcoal absorption, film process, ozone oxidation, but these methods exist, and removal effect is not good, bisphenol-A of can not degrading make it to lose endocrine or ozone oxidation not exclusively, product species and toxicity fails to understand, makes these technology cannot reach the object of safe and effective removal bisphenol-A.And be that the removal effect of traditional wastewater treatment system to BPA of main process is limited with biological treatment, the half-life reaches a couple of days to several weeks.TiO
2photocatalysis oxidation technique catalytic activity is high, easy and simple to handle, the mineralization of organic material of part difficult for biological degradation in water can be become CO
2and H
2o is a kind of environmentally-friendly technique, has huge application prospect.In view of TiO
2be nanometer materials, suspend distribution in the reactor, is difficult to reclaim, and not only wastes resource, also can cause secondary pollution.For bisphenol-A difficult for biological degradation, suspended state TiO
2the problem such as difficulty recovery, the recyclable magnet carried photocatalyst TiO of fast degradation bisphenol-A is prepared in this research
2/ SiO
2/ γ-Fe
2o
3, detect the structure composition of this catalyst, surface characteristic and the degradation effect to BPA in water thereof, inquire into its degradation rule, investigate the repeatedly organic efficiency after this catalyst degradation bisphenol-A simultaneously.
Summary of the invention
Goal of the invention: the invention provides recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A and preparation method thereof in a kind of fast degradation waste water, to solve in prior art bisphenol-A difficult degradation and TiO in waste water
2the problem that particle is difficult in the solution be separated and can not reuses.
Technical scheme: to achieve these goals, the present invention by the following technical solutions:
A preparation method for the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water, comprises the following steps:
(1) magnetic core is prepared: by Fe
2(SO
4)
3and FeSO
47H
2o is dissolved in the deionized water of same volume respectively; be mixed with after concentration is the aqueous solution of 0.15mol/L and mix; ethanol is added in above-mentioned mixed solution; 80 DEG C of water-baths; and stirred under nitrogen atmosphere, add sodium hydroxide solution and pH value is adjusted to 11 ~ 13, after stirring 1h; ageing 3h at 60 DEG C, obtains magnetic core Fe
3o
4, use magnet separated product, and spend deionized water 3 times;
(2) SiO is prepared
2intermediate layer: the magnetic core Fe obtained by step (1)
3o
4sample is in 100mL deionized water, add the dispersant of 30ml0.1mol/L, under 50 DEG C of water-baths, first stir and play peptizaiton, then continue to stir, and add 28ml ethyl orthosilicate and 10mL concentrated ammonia liquor successively, after stirring 3h, wash 3 times with ethanol, at 80 DEG C after finish-drying, at temperature is 400 DEG C, calcine 1h; Again temperature is adjusted to 600 DEG C of calcining 2h, obtains SiO
2/ γ-Fe
2o
3;
(3) load TiO
2layer: by step (2) gained SiO
2/ γ-Fe
2o
3sample is placed in 52ml butyl titanate and 150 ~ 180ml ethanol, after ultrasonic disperse 10min, 40 DEG C of stirred in water bath, drip volumetric concentration and be followed successively by the deionized water of 6% ~ 24%, 1% ~ 4%, 72% ~ 93%, the mixed solution of nitric acid and ethanol, in time being hydrolyzed formation colloidal sol, stop stirring; After ageing 1h, through 80 DEG C of finish-dryings, obtain gel, then at 460 DEG C ~ 500 DEG C, calcining 1 ~ 2h, finally grinds to obtain magnet carried photocatalyst TiO
2/ SiO
2/ γ-Fe
2o
3.
Further, paddle is used to stir with the speed of 1000rad/min in described step (1).
Further, first stir with the speed of 200rad/min in described step (2) and play peptizaiton, then stir with the speed of 1000rad/min.
Further, in described step (3) in 40 DEG C of water-baths, stir with the speed of 1000rad/min, drip volumetric concentration with the speed of 120/min and be followed successively by the deionized water of 6% ~ 24%, 1% ~ 4%, 72% ~ 93%, the mixed solution of nitric acid and ethanol.
Further, in described step (2), dispersant is sodium dodecyl sulfate solution.
Further, the amount of the ethyl orthosilicate dripped in described step (2) is 1.0 times of Fe element molal quantity.
Further, in described step (3), the amount of butyl titanate is 2.0 times of Fe element molal quantity.
Further, in described step (3), the gel of gained, is warmed up to 460 DEG C ~ 500 DEG C calcinings according to 5 DEG C/min.
In fast degradation waste water, a recyclable magnetic titanium dioxide photochemical catalyst for bisphenol-A, comprises magnetic core Fe
3o
4, magnetic core Fe
3o
4be enclosed with intermediate layer SiO
2, intermediate layer SiO
2outer also load has TiO
2layer.
Beneficial effect: catalyst prepared by the present invention can bisphenol-A in degrading waste water fast and efficiently, the TiO of load
2be mainly the Detitanium-ore-type that catalytic activity is the highest; Utilize externally-applied magnetic field can realize repeatedly effectively reclaiming of catalyst, and keep higher catalytic degradation ability.
Accompanying drawing explanation
Fig. 1 be in the embodiment of the present invention magnetic titanium dioxide photochemical catalyst for the treatment effect figure of bisphenol-A in waste water;
Fig. 2 is the organic efficiency of magnetic titanium dioxide photochemical catalyst in the embodiment of the present invention;
Fig. 3 is the x-ray diffraction pattern of magnetic titanium dioxide photochemical catalyst in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1
A preparation method for the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water, comprises the following steps:
(1) magnetic core is prepared:
Take 6.0gFe respectively
2(SO
4)
3and 4.2gFeSO
47H
2o is dissolved in the deionized water of same volume respectively; be mixed with each 100ml of the aqueous solution that concentration is 0.15mol/L; then mix, in above-mentioned mixed solution, add 100ml ethanol, 80 DEG C of water-baths; and under nitrogen protection; use paddle to carry out rapid stirring with 1000rad/min, add sodium hydroxide solution and pH value is adjusted to 11, after stirring 1h; ageing 3h at 60 DEG C, with magnet separated product Fe
3o
4, and spend deionized water 3 times.
(2) SiO is prepared
2intermediate layer:
The magnetic core Fe obtained by step (1)
3o
4sample is in 100mL deionized water, add the sodium dodecyl sulfate solution of 30ml0.1mol/L, under 50 DEG C of water-baths, first 200rad/min stirring at low speed plays peptizaiton, then with 1000rad/min rapid stirring, and add 28ml ethyl orthosilicate and 10mL concentrated ammonia liquor successively, after stirring 3h, wash 3 times with ethanol, at 80 DEG C after finish-drying, at temperature is 400 DEG C, calcine 1h; Again temperature is adjusted to 600 DEG C of calcining 2h, obtains SiO
2/ γ-Fe
2o
3;
(3) load TiO
2layer:
By step (2) gained SiO
2/ γ-Fe
2o
3sample is placed in 52ml butyl titanate and 150ml ethanol, after ultrasonic disperse 10min, with 1000rad/min rapid stirring in 40 DEG C of water-baths, slowly drip volumetric concentration with 120/min and be followed successively by the deionized water of 24%, 4%, 72%, the mixed solution of nitric acid and ethanol, in time being hydrolyzed formation colloidal sol, stop stirring; After ageing 1h, through 80 DEG C of finish-dryings, obtain gel, at being then warmed up to 460 DEG C according to 5 DEG C/min, calcine 1h, finally grind to obtain magnet carried photocatalyst TiO
2/ SiO
2/ γ-Fe
2o
3.
The amount of the ethyl orthosilicate dripped in described step (2) is 1.0 times of Fe element molal quantity.
In described step (3), the amount of butyl titanate is 2.0 times of Fe element molal quantity.
Embodiment 2
A preparation method for the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water, comprises the following steps:
(1) magnetic core is prepared:
Take 6.0gFe respectively
2(SO
4)
3and 4.2gFeSO
47H
2o is dissolved in the deionized water of same volume respectively; be mixed with each 100ml of the aqueous solution that concentration is 0.15mol/L; then mix, in above-mentioned mixed solution, add 100ml ethanol, 80 DEG C of water-baths; and under nitrogen protection; use paddle to carry out rapid stirring with 1000rad/min, add sodium hydroxide solution and pH value is adjusted to 12, after stirring 1h; ageing 3h at 60 DEG C, with magnet separated product Fe
3o
4, and spend deionized water 3 times.
(2) SiO is prepared
2intermediate layer:
The magnetic core Fe obtained by step (1)
3o
4sample is in 100mL deionized water, add the dispersant of 30ml0.1mol/L, under 50 DEG C of water-baths, first 200rad/min stirring at low speed plays peptizaiton, then with 1000rad/min rapid stirring, and add 28ml ethyl orthosilicate and 10mL concentrated ammonia liquor successively, after stirring 3h, wash 3 times with ethanol, at 80 DEG C after finish-drying, at temperature is 400 DEG C, calcine 1h; Again temperature is adjusted to 600 DEG C of calcining 2h, obtains SiO
2/ γ-Fe
2o
3;
(3) load TiO
2layer:
By step (2) gained SiO
2/ γ-Fe
2o
3sample is placed in 52ml butyl titanate and 160ml ethanol, after ultrasonic disperse 10min, with 1000rad/min rapid stirring in 40 DEG C of water-baths, slowly drip volumetric concentration with 120/min and be followed successively by the deionized water of 6%, 1%, 93%, the mixed solution of nitric acid and ethanol, in time being hydrolyzed formation colloidal sol, stop stirring; After ageing 1h, through 80 DEG C of finish-dryings, obtain gel, at being then warmed up to 480 DEG C according to 5 DEG C/min, calcine 1.5h, finally grind to obtain magnet carried photocatalyst TiO
2/ SiO
2/ γ-Fe
2o
3.
The amount of the ethyl orthosilicate dripped in described step (2) is 1.0 times of Fe element molal quantity.
In described step (3), the amount of butyl titanate is 2.0 times of Fe element molal quantity.
Embodiment 3
A preparation method for the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water, comprises the following steps:
(1) magnetic core is prepared:
Take 6.0gFe respectively
2(SO
4)
3and 4.2gFeSO
47H
2o is dissolved in the deionized water of same volume respectively; be mixed with each 100ml of the aqueous solution that concentration is 0.15mol/L; then mix, in above-mentioned mixed solution, add 100ml ethanol, 80 DEG C of water-baths; and under nitrogen protection; use paddle to carry out rapid stirring with 1000rad/min, add sodium hydroxide solution and pH value is adjusted to 13, after stirring 1h; ageing 3h at 60 DEG C, with magnet separated product Fe
3o
4, and spend deionized water 3 times.
(2) SiO is prepared
2intermediate layer:
The magnetic core Fe obtained by step (1)
3o
4sample is in 100mL deionized water, add the dispersant of 30ml0.1mol/L, under 50 DEG C of water-baths, first 200rad/min stirring at low speed plays peptizaiton, then with 1000rad/min rapid stirring, and add 28ml ethyl orthosilicate and 10mL concentrated ammonia liquor successively, after stirring 3h, wash 3 times with ethanol, at 80 DEG C after finish-drying, at temperature is 400 DEG C, calcine 1h; Again temperature is adjusted to 600 DEG C of calcining 2h, obtains SiO
2/ γ-Fe
2o
3;
(3) load TiO
2layer:
By step (2) gained SiO
2/ γ-Fe
2o
3sample is placed in 52ml butyl titanate and 180ml ethanol, after ultrasonic disperse 10min, with 1000rad/min rapid stirring in 40 DEG C of water-baths, slowly drip volumetric concentration with 120/min and be followed successively by the deionized water of 12%, 2%, 86%, the mixed solution of nitric acid and ethanol, in time being hydrolyzed formation colloidal sol, stop stirring; After ageing 1h, through 80 DEG C of finish-dryings, obtain gel, at being then warmed up to 500 DEG C according to 5 DEG C/min, calcine 2h, finally grind to obtain magnet carried photocatalyst TiO
2/ SiO
2/ γ-Fe
2o
3.
The amount of the ethyl orthosilicate dripped in described step (2) is 1.0 times of Fe element molal quantity.
In described step (3), the amount of butyl titanate is 2.0 times of Fe element molal quantity.
The application example of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water prepared by the present invention:
Magnetic carries TiO
2the preparation method of photochemical catalyst is directly connected to the catalytic performance of catalyst, and then affects the treatment effect of photochemical catalyst.Adopt the TiO that sol-gel process provided by the invention is obtained
2be evenly distributed, narrow diameter distribution, specific area are large, combine firmly, be specially adapted to the preparation of difformity carrier surface photo-catalysis function film.Meanwhile, for intercepting TiO
2with magnetic core generation clinkering, mutual, affect the catalytic activity of catalyst and magnetic and the intermediate layer SiO that adds
2genus polyporus material, surface configuration is various, and therefore, the present invention adopts sol-gel process to prepare TiO
2.
The present invention is directed to the problem of bisphenol-A difficult degradation in waste water, successfully prepare the recyclable magnetic carrying of titanium dioxide photocatalyst of bisphenol-A in fast degradation waste water, photocatalytic degradation experiment results proved is under the ultraviolet lighting of UV254, and this catalyst has good photocatalytic activity and can magnetic recyclability to bisphenol-A in waste water.
Magnet carried photocatalyst TiO
2/ SiO
2/ γ-Fe
2o
3photocatalytic degradation bisphenol-A is tested: according to relevant report, in China's industrial park sewage, bisphenol A concentration is 74.38 ~ 597.07 μ g/L, and in the selected solution of this test, bisphenol A concentration is 300 μ g/L.Reaction condition is: pH value is 5, catalyst amounts 4g/L, water temperature 18.6 DEG C, UV254 UV-irradiation, uviol lamp power P
light=10W, uviol lamp wavelength X=254nm, motor machine agitator.By bisphenol-A residual concentration in high performance liquid chromatograph detection reaction liquid, calculate bisphenol-A degradation rate, with the degradation rate of bisphenol-A for evaluating magnetic carrying of titanium dioxide light photochemical catalyst TiO
2/ SiO
2/ γ-Fe
2o
3the foundation of photocatalytic activity.
Test concrete operations are: select and add the BPA solution that 100mL initial concentration is 300 μ g/L in the quartz reactor (Φ × H=80 × 100mm) of 500ml.The uviol lamp level of dominant wavelength 254nm is placed in directly over reactor, distance liquid level 100mm, liquid level place light intensity 434 μ W/cm at the bottom of fluorescent tube
2, sampling interval time is 20min, and 3h is carried out in reaction.Carry out in time after sample preparation well twice centrifugal, centrifugal condition is respectively rotating speed 8000r/min, duration 10min, temperature 4 DEG C and rotating speed 10000r/min, duration 10min, temperature 4 DEG C.Bisphenol A concentration adopts Agilent-1260 type hplc determination, C18 chromatographic column, mobile phase is methyl alcohol: water=80:20, methyl alcohol (HPLC level, Tedia company), experimental water (Milli-Q ultrapure water system, Millipore company), flow velocity 1mL/min, column temperature room temperature, fluorescence detector, excitation wavelength 227nm, emission wavelength 313nm.
As Fig. 1 shows magnetic titanium dioxide photochemical catalyst (titanium dioxide magnet carried photocatalyst) that the embodiment of the present invention the provides degradation efficiency for BPA.
After reaction 3h, TiO in reaction system
2/ SiO
2/ γ-Fe
2o
3to the clearance Da Gaoda 71.51% of BPA.Further, when reaction proceeds to 100min, BPA clearance remains stable substantially, and reaction speed is very fast.Demonstrate the TiO that the embodiment of the present invention provides
2/ SiO
2/ γ-Fe
2o
3higher to the removal efficiency of BPA in water.
Wherein: pH value=5, catalyst amounts=4.0g/L, BPA initial concentration=300 μ g/L, water temperature=18.6 DEG C, uviol lamp power P
light=10W, uviol lamp wavelength X=254nm.
The organic efficiency of magnetic titanium dioxide photochemical catalyst (titanium dioxide magnet carried photocatalyst) that theres is provided of the embodiment of the present invention as shown in Figure 2.
This catalyst can realize catalyst and being separated of disposing of sewage under the effect of externally-applied magnetic field, reaches recovering effect.When first time reclaims, the rate of recovery of catalyst is 97%, and when second time reclaims, catalyst recovery efficiency reduces to 93%, and when third time reclaims, catalyst recovery yield is that the 91%, four organic efficiency becomes 90%.Repeat recovery four times, the rate of recovery of catalyst all maintains more than 90%, reclaim the clearance of catalyst to BPA and remain on more than 60%, illustrate that the magnet carried photocatalyst that the embodiment of the present invention provides has good recyclability, effectively can reduce the catalyst attrition in engineer applied, reduce the generation of secondary pollution, in containing the Practical Project of bisphenol-A Industrial Wastewater Treatment, there is applications well prospect.
Wherein: pH value=5, catalyst amounts=4.0g/L, BPA initial concentration=300 μ g/L, water temperature=18.6 DEG C, uviol lamp power P
light=10W, uviol lamp wavelength X=254nm.
As Fig. 3 shows the x-ray diffraction pattern of the magnetic titanium dioxide photochemical catalyst (titanium dioxide magnet carried photocatalyst) that the embodiment of the present invention provides.
SiO is analyzed with X-ray diffractometer (XRD)
2/ γ-Fe
2o
3with magnet carried photocatalyst TiO
2/ SiO
2/ γ-Fe
2o
3crystal formation.The peak being 25.320 °, 37.781 °, 48.040 °, 54.038 °, 55.157 °, 62.604 ° place's appearance in 2 θ values belongs to Anatase TiO respectively
2(101), (004), (200), (105), (211), (204) characteristic diffraction peak.At TiO
2three kinds of crystal formations in, Anatase TiO
2photocatalytic activity higher than brookite and Rutile Type TiO
2, the display embodiment of the present invention provides catalyst to have good catalytic performance.By SiO
2/ γ-Fe
2o
3and TiO
2/ SiO
2/ γ-Fe
2o
3xRD collection of illustrative plates carry out contrast find, SiO
2/ γ-Fe
2o
3γ-Fe in collection of illustrative plates
2o
3be 30.318 °, 35.641 °, 43.364 °, 53.778 °, 57.380 °, 62.979 ° in 2 θ values and there is characteristic diffraction peak, and these characteristic diffraction peaks are at TiO
2/ SiO
2/ γ-Fe
2o
3obviously weaken in collection of illustrative plates, it can thus be appreciated that, TiO
2to γ-Fe
2o
3magnetic core achieves effectively coated, forms core shell structure.
In fast degradation waste water, a recyclable magnetic titanium dioxide photochemical catalyst for bisphenol-A, comprises magnetic core Fe
3o
4, magnetic core Fe
3o
4be enclosed with intermediate layer SiO
2, intermediate layer SiO
2outer also load has TiO
2layer.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water, is characterized in that, comprise the following steps:
(1) magnetic core is prepared: by Fe
2(SO
4)
3and FeSO
47H
2o is dissolved in the deionized water of same volume respectively; be mixed with after concentration is the aqueous solution of 0.15mol/L and mix; ethanol is added in above-mentioned mixed solution; 80 DEG C of water-baths; and stirred under nitrogen atmosphere, add sodium hydroxide solution and pH value is adjusted to 11 ~ 13, after stirring 1h; ageing 3h at 60 DEG C, obtains magnetic core Fe
3o
4, use magnet separated product, and spend deionized water 3 times;
(2) SiO is prepared
2intermediate layer: the magnetic core Fe obtained by step (1)
3o
4sample is placed in 100mL deionized water, add the dispersant of 30ml0.1mol/L, under 50 DEG C of water-baths, first stir and play peptizaiton, then continue to stir, and add 28ml ethyl orthosilicate and 10mL concentrated ammonia liquor successively, after stirring 3h, wash 3 times with ethanol, at 80 DEG C after finish-drying, at temperature is 400 DEG C, calcine 1h; Again temperature is adjusted to 600 DEG C of calcining 2h, obtains SiO
2/ γ-Fe
2o
3;
(3) load TiO
2layer: by step (2) gained SiO
2/ γ-Fe
2o
3sample is placed in 52ml butyl titanate and 150 ~ 180ml ethanol, after ultrasonic disperse 10min, 40 DEG C of stirred in water bath, drip volumetric concentration and be followed successively by the deionized water of 6% ~ 24%, 1% ~ 4%, 72% ~ 93%, the mixed solution of nitric acid and ethanol, in time being hydrolyzed formation colloidal sol, stop stirring; After ageing 1h, through 80 DEG C of finish-dryings, obtain gel, then at 460 DEG C ~ 500 DEG C, calcining 1 ~ 2h, finally grinds to obtain magnet carried photocatalyst TiO
2/ SiO
2/ γ-Fe
2o
3.
2. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water according to claim 1, is characterized in that: use paddle to stir with the speed of 1000rad/min in described step (1).
3. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water according to claim 1, it is characterized in that: first stir with the speed of 200rad/min in described step (2) and play peptizaiton, then stir with the speed of 1000rad/min.
4. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water according to claim 1, it is characterized in that: in described step (3) in 40 DEG C of water-baths, stir with the speed of 1000rad/min, drip volumetric concentration with the speed of 120/min and be followed successively by the deionized water of 6% ~ 24%, 1% ~ 4%, 72% ~ 93%, the mixed solution of nitric acid and ethanol.
5. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water according to claim 1, is characterized in that: in described step (2), dispersant is sodium dodecyl sulfate solution.
6. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water according to claim 1, is characterized in that: the amount of the ethyl orthosilicate dripped in described step (2) is 1.0 times of Fe element molal quantity.
7. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water according to claim 1, is characterized in that: in described step (3), the amount of butyl titanate is 2.0 times of Fe element molal quantity.
8. the preparation method of the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water according to claim 1, is characterized in that: the gel of gained in described step (3), is warmed up to 460 DEG C ~ 500 DEG C according to 5 DEG C/min.
9. the recyclable magnetic titanium dioxide photochemical catalyst of bisphenol-A in fast degradation waste water, is characterized in that: comprise magnetic core Fe
3o
4, magnetic core Fe
3o
4be enclosed with intermediate layer SiO
2, intermediate layer SiO
2outer also load has TiO
2layer.
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| CN111974211A (en) * | 2020-08-05 | 2020-11-24 | 天津大沽化工股份有限公司 | Method for treating epoxypropane-containing process waste gas |
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Application publication date: 20160106 |