CN104984756A - NF-Bi2O3-SBA visible light responding photocatalyst, preparation method thereof and application thereof - Google Patents
NF-Bi2O3-SBA visible light responding photocatalyst, preparation method thereof and application thereof Download PDFInfo
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Abstract
The invention discloses an NF-Bi2O3-SBA visible light responding photocatalyst, a preparation method thereof and application thereof. The photocatalyst is prepared from NH4F, Bi(NO3)3.5H2O and an SBA molecular sieve. The preparation method comprises the following steps of (1) dissolving the Bi(NO3)3.5H2O in ethylene glycol, adding the SBA molecular sieve, and after uniform dispersion, drying and grinding a product to obtain Bi(NO3)3-SBA powder; (2) partially dissolving the dried NH4F in ethanol, after the solution and the Bi(NO3)3-SBA powder are uniformly ground, calcining, and after calcining, treating the product to obtain the photocatalyst, i.e. NF-Bi2O3-SBA. The photocatalyst provided by the invention is used for treating chrome-containing waste water. The NF-Bi2O3-SBA photocatalyst described in claim I or claim 6 is added into the Cr(VI)-containing waste water, the pH is adjusted, the waste water is stirred at a dark place until adsorption equilibrium, and the mixture is irradiated under visible light. The photocatalyst provided by the invention is high in visible light response degree, and good in photo-generated electrons and cavity separation effect and strong in reductibility, the effect of treating the chrome-containing waste water is good, and no secondary pollution is caused.
Description
Technical field
The present invention relates to catalysis material technical field, especially visible light responsible photocatalytic material technical field, be specifically related to a kind of NF-Bi
2o
3-SBA visible light responsive photocatalyst and its preparation method and application.
Background technology
Heavy metal chromium Cr (VI) is the common pollution components in plating, process hides and dyeing waste water, has stronger teratogenesis and carcinogenicity, is one of Environmental Protection Agency USA's 129 kinds of priority pollutants of generally acknowledging, China's priority control object especially.At present, the thinking of administering for pollution of chromium is that strong for solubility, easily migration, highly toxic Cr VI Cr (VI) to be reduced to toxicity little 100 times and be easy to the trivalent chromium Cr (III) of coordination precipitation.
Such as, publication number is a kind of method that the Chinese invention patent application document of CN 103086536A discloses processing waste water containing chrome, and the pH of waste water is first adjusted to 1-3 with conditioning agent by it, and conditioning agent is the concentrated sulfuric acid; Add reducing agent, reducing agent is sulfur dioxide, sodium sulfite, metabisulfite; Add again NaOH neutralization, being adjusted to pH is 8.5-8.8, in and time controling at 10-12min; Then flocculant PEO is added, mixing speed 60-80r/min, sedimentation time 40-60min; The stillness of night after sedimentation can discharge, and recycles after the solid matter drying of sedimentation.
Publication number is the processing method that the Chinese invention patent application document of CN 102399037A discloses a kind of chromate waste water, the processing method of chromate waste water, comprise following steps: (1) processes in regulating reservoir: be transported to by chromate waste water in regulating reservoir after filtering suspension, carry out water quality and water quantity exchange; (2) process in treatment pond: the chromate waste water of regulating reservoir is outputted in treatment pond, add sulfuric acid adjusted to ph between 2.5-3.2, then add ferrous sulfate and carry out stirring 10-20 minute; (3) neutralisation treatment: add alkaline matter in each treatment pond and neutralize, stir and adjusted to ph between 7-8; (4) process in sedimentation basin: output in sedimentation basin by the waste water for the treatment of pond, upper strata clean water overflow is to clear water reserviors, and sediment is then transported to sludge concentration tank.
Photocatalysis technology has reaction condition gentleness, with low cost, effectively can remove persistent organic pollutants or reduction attenuation valence heavy metal ions, have broad application prospects in chromate waste water process under the prerequisite not introducing secondary pollution.But the defect that photochemical catalyst ubiquity visible ray utilization ratio is low at present.
Summary of the invention
The invention provides a kind of NF-Bi
2o
3-SBA visible light responsive photocatalyst and its preparation method and application, the visible light-responded degree of this photochemical catalyst is high, light induced electron and hole good separating effect, and the reproducibility of photochemical catalyst is strong, for the process of chromate waste water, effective, non-secondary pollution.
A kind of NF-Bi
2o
3-SBA visible light responsive photocatalyst, by NH
4f, Bi (NO
3)
35H
2o and SBA molecular sieve is made, wherein Bi (NO
3)
35H
2o and SBA mass ratio is 0.52 ~ 2.08:1, NH
4f and Bi (NO
3)
3-SBA mass ratio is 1:1.
The present invention also provides a kind of NF-Bi
2o
3the preparation method of-SBA visible light responsive photocatalyst, NF-Bi provided by the present invention
2o
3-SBA visible light responsive photocatalyst preferably adopts the method to prepare, and this preparation method comprises the steps:
(1) by Bi (NO
3)
35H
2o is dissolved in ethylene glycol, then adds SBA molecular sieve, dispersed post-drying, grinds to obtain Bi (NO
3)
3-SBA powder;
(2) by the NH after oven dry
4f is partly dissolved in ethanol, with Bi (NO
3)
3-SBA powder mull is evenly calcined afterwards; Photochemical catalyst NF-Bi is obtained through post processing after calcining
2o
3-SBA.
Described last handling process is: grinding, deionized water washing, centrifugal, dry and again grind.
Being partly dissolved described in step (2) points to the NH after drying
4f drips ethanol, and a part is dissolved in ethanol, and a part still exists in solid form.Being partly dissolved is conveniently grind and be beneficial to catalyst mix even, if all dissolved, is exactly a small amount of liquid, is not easy to mix,
With the photochemical catalyst that bismuth is representative, can photo-generate electron-hole pair be produced under UV-irradiation, in reducing heavy metal ion Cr (VI), have good effect, but due to energy gap wide, can only utilize and account for the less ultraviolet region of sunshine gross energy, by Bi
2o
3the element that middle doping is appropriate, makes its forbidden band narrow, the light that absorbing wavelength is longer, thus can utilize more visible ray; During dual element codope, strengthen further that it is visible light-responded, photocatalytic activity significantly improves; In addition, Bi
2o
3specific area less, when carrying out Cr (VI) and reducing, contact is abundant not, makes the reduction effect of Cr (VI) not good; The present invention also introduces the large molecular sieve of a kind of specific area, by itself and photochemical catalyst compound, increases the contact area of catalyst and reaction substrate, improves catalytic efficiency.
The present invention is with Bi
2o
3based on, carry out the two nonmetal doping of N, F, and be aided with SBA molecular sieve, prepare composite photo-catalyst NF-Bi
2o
3-SBA.Bi
2o
3energy gap is 2.8V, and energy gap is comparatively large, though there is certain photocatalysis effect, but visible light-responded not high; N, F are codoping modified, introduce impurity energy level and defect level in forbidden band, and its forbidden band can be made to narrow, and make the red shift of absorption band edge, the light that absorbing wavelength is longer, thus have visible light-responded property; SBA molecular sieve has very large specific area, after photochemical catalyst compound, can increase the contact area of catalyst and reaction substrate, thus improves catalytic efficiency.
In the present invention, SBA, Bi
2o
3after N, F compound, the crystal formation of catalyst changes, and the catalytic activity of catalyst significantly improves.Test finds at Bi
2o
3basis on carry out N, F codoping modified time, it obtains obvious enhancing to Cr (VI) reducing property, and when using SBA15 as substrate, catalytic performance is compared to NF-Bi
2o
3to get back certain lifting.At same time, NF-Bi
2o
3the clearance of-SBA to Cr (VI) is about Bi
2o
32 times.
Described SBA molecular sieve is SBA-15, prepares by the following method:
The polyethers P123 getting 16.0g is dissolved in the mixed solution of 240mL deionized water and 40mL concentrated hydrochloric acid, add ethyl orthosilicate 36.8mL, stir, in the water bath with thermostatic control of 35 DEG C, leave standstill 20h, abandoning supernatant, the white colloidal obtained is transferred in hydrothermal reaction kettle, in an oven, and 100 DEG C, after constant temperature 24h, filtration is precipitated, after washing several times, carry out vacuum drying by gained solid transfer to vacuum drying chamber, obtain the thick product SBA-15 of white;
Thick product is pulverized last, transfers to roasting in Muffle furnace, with 1 DEG C of min
-1heating rate rises to 550 DEG C, constant temperature 5h, is again ground by the SBA-15 obtained, and water washing 3-5 time, dry and obtain SBA-15.
Described SBA-15 also can obtain by buying.
In step (1), adopt and ultrasonicly carry out dispersed, the ultrasonic disperse time is 30 ~ 80min, is preferably 40 ~ 60min, most preferably 60min; Bake out temperature in step (1) is 185 DEG C.
NF-Bi
2o
3in-SBA catalyst, Bi
2o
3be 0.5 ~ 2:1 with SBA mass ratio, as preferably, Bi
2o
3be 1 ~ 2:1 with SBA mass ratio, most preferably be 2:1; Corresponding with it, Bi (NO in step (1)
3)
35H
2o and SBA mass ratio is 0.52 ~ 2.08:1; Most preferably be 2.08:1.
In step (2), NH
4the oven dry of F is by by NH
4f puts into 55 DEG C of baking ovens, and 30min is dried obtained.
NH after drying in step (1)
4f and Bi (NO
3)
3-SBA mass ratio is 0.8 ~ 1.2:1, is preferably 1:1.
In step (2), during calcining, controling parameters is: 3 ~ 8 DEG C/min is warming up to 450 DEG C ~ 550 DEG C, keeps 150 ~ 200min; Be preferably: 5 DEG C/min is warming up to 500 DEG C, keep 180min.
In step (3), washing adopts deionized water, and deionization washing 3 ~ 5 times, is preferably 5 times.
About preparation method of the present invention, a kind of most preferred technical scheme:
(1) by Bi (NO
3)
35H
2o is dissolved in ethylene glycol, then adds SBA molecular sieve, ultrasonic dispersed rear 185 DEG C of oven dry, grinds to obtain Bi (NO
3)
3-SBA powder; Bi (NO
3)
35H
2o and SBA mass ratio is 2.08:1;
(2) by the NH after oven dry
4f is partly dissolved in ethanol, with Bi (NO
3)
3-SBA powder mull is evenly calcined afterwards, the NH after oven dry
4f and Bi (NO
3)
3-SBA mass ratio is 1:1; After calcining through grinding, deionized water washing, centrifugal, dry and again grind to obtain photochemical catalyst NF-Bi
2o
3-SBA.The present invention also provide a kind of as described in the NF-Bi for preparing of preparation method
2o
3-SBA photochemical catalyst.
The present invention also provides one to utilize described NF-Bi
2o
3the method of-SBA photocatalyst treatment chromate waste water, comprises the steps:
Described NF-Bi is added to containing in the waste water of Cr (VI)
2o
3-SBA photochemical catalyst, regulate pH, be stirred to adsorption equilibrium in dark place, radiation of visible light reacts.
Cr (VI) is reduced to the Cr (III) that toxicity is little 100 times, coordination precipitation easily occurs by light induced electron.NF-Bi
2o
3-SBA photochemical catalyst under visible light illumination, produces light induced electron and hole, and electronics is used for Cr (VI) being reduced to Cr (III), Hole oxidation water, and water serves as sacrifice agent effect.Cr (VI) is reduced into Cr (III), and toxicity reduces, and the Cr (III) of formation can remove easily via precipitation, thus reaches the object of processing waste water containing chrome.
In chromate waste water, the concentration of Cr (VI) is 50 ~ 100 μm of ol/L; Be preferably 80 μm of ol/L.
The process of chromate waste water needs to carry out in acid condition, and pH value has a great impact for the reduction of Cr (VI), and in general acid strong, the reduction effect of Cr (VI) is good.But peracid, the expense that can strengthen acid drops into.
Preferably, pH value of waste water is regulated to be 2 ~ 4; More preferably 3 ~ 4, most preferably be 3.
Radiation of visible light adopts xenon lamp, and elimination wavelength is less than 420nm part, and the operating current controlling xenon lamp is 10A ~ 22A; Most preferably be 22A, change the operating current of light source to change the light intensity of visible ray, intensity of illumination affects the separating effect in photochemical catalyst light induced electron and hole, thus has impact to the treatment effect of chromate waste water.
The time that radiation of visible light carries out reacting is 20 ~ 150min.
The existence of sacrifice agent, can affect NF-Bi
2o
3the effect of-SBA photocatalyst treatment chromate waste water.Under visible light illumination, NF-Bi
2o
3-SBA photochemical catalyst produces light induced electron and hole, and electronics is used for Cr (VI) to be reduced to Cr (III).EDTA is a kind of hole trapping agents, and can promote the generation of electronics while catching hole, its addition can affect the effect of photocatalyst treatment chromate waste water.Therefore, EDTA hole trapping agents is also added with containing in the waste water of Cr (VI).The dosage of EDTA and the volume ratio of waste water are 1:100; EDTA concentration is 0.001mmol/L.
NF-Bi
2o
3the dosage of-SBA photochemical catalyst is 0.5 ~ 1.5g/L; Be preferably 1g/L.
The object of this invention is to provide a kind of NF-Bi
2o
3the preparation method of-SBA photochemical catalyst, and the process being applied to chromate waste water.At Bi
2o
3on basis, codoping modified by N, F, its forbidden band can be made to narrow, make the red shift of absorption band edge, the light that absorbing wavelength is longer, thus there is visible light-responded property; Introduce SBA molecular sieve, increase the contact area of catalyst and reaction substrate, improve catalytic efficiency.Be applied to the process of chromate waste water, under the combination of above-mentioned each optimum condition, treatment effect is better.
Beneficial effect of the present invention has:
(1) the visible light-responded degree of catalyst is high;
(2) light induced electron and hole good separating effect;
(3) to the process of chromate waste water, effective.
Accompanying drawing explanation
Fig. 1 (a) in the embodiment of the present invention 2, the density of photocurrent figure of electrode under ultraviolet-visible light prepared by three kinds of photochemical catalysts;
Fig. 1 (b) in the embodiment of the present invention 2, electrode density of photocurrent figure under visible light prepared by three kinds of photochemical catalysts.
Fig. 2 is in the embodiment of the present invention 3, utilizes NF-Bi
2o
3electrode the prepared by-SBA photochemical catalyst AC impedance figure under visible light, in dark.
Fig. 3 (a) in the embodiment of the present invention 3, three kinds of electrodes AC impedance figure under visible light simultaneously;
Fig. 3 (b) in the embodiment of the present invention 3, three kinds of electrodes AC impedance figure in the dark simultaneously.
Fig. 4 is in the embodiment of the present invention 4, photochemical catalyst NF-Bi
2o
3, Bi
2o
3-SBA, Bi
2o
3, reduction chromium effect contrast figure.
Fig. 5 is in the embodiment of the present invention 5, and during different pH value, effect of chromium-containing wastewater treatment contrasts.
Fig. 6 is in the embodiment of the present invention 6, and during different EDTA amount, effect of chromium-containing wastewater treatment contrasts.
Fig. 7 is in the embodiment of the present invention 7, and during different illumination intensity, effect of chromium-containing wastewater treatment contrasts.
Detailed description of the invention
Now in conjunction with Figure of description and specific embodiment, the present invention is further described.
Embodiment 1
(1) NF-Bi
2o
3the preparation of-SBA photochemical catalyst, step is as follows:
(1) Bi (NO of 2.08g is got
3)
35H
2o is dissolved in 10ml ethylene glycol, stirs, to be dissolved completely after add 1g SBA, ultrasonic 60min dispersion, 185 DEG C of oven dry, obtain Bi (NO in an oven
3)
3-SBA solid, is ground into fine powder;
(2) 0.3g NH after drying
4f puts into mortar, drips ethanol and makes it be partly dissolved, add 0.3g Bi (NO
3)
3-SBA powder mull is even, is then transferred in crucible, in Muffle furnace, is warming up to 500 DEG C with 5 DEG C/min, calcining 180min;
(3) grinding after calcining, wash 5 times by deionized water, 10000r/min is centrifugal, dries, again grinds to form fine powder, obtain target light catalyst n F-Bi
2o
3-SBA.
(2) Bi
2o
3the preparation of photochemical catalyst, step is as follows:
Evenly be laid on quartz boat by 4g bismuth nitrate (five water), form thin layer, be warming up to 500 DEG C, calcining at constant temperature 3h with 5 DEG C/min, after taking out, grinding, obtains Bi
2o
3photochemical catalyst.
(3) NF-Bi
2o
3the preparation of photochemical catalyst, step is as follows:
0.3g NH after drying
4f puts into mortar, drips ethanol and makes it be partly dissolved, add 0.3g Bi
2o
3grinding evenly, is then transferred in crucible, in Muffle furnace, is warming up to 500 DEG C with 5 DEG C/min, calcining 180min;
(4) Bi
2o
3the preparation of-SBA photochemical catalyst, method is as follows:
By NF-Bi
2o
3in the preparation process of-SBA photochemical catalyst, Bi (NO prepared by step (1)
3)
3-SBA solid, in Muffle furnace, is warming up to 500 DEG C with 5 DEG C/min, and calcining 180min, obtains Bi
2o
3-SBA photochemical catalyst.
Embodiment 2
Get catalyst B i prepared by 0.1g
2o
3, NF-Bi
2o
3, Bi
2o
3-SBA and NF-Bi
2o
3-SBA is dissolved in 0.25mL ethylene glycol, ultrasonic disperse 30min, drip be applied to be pasted with conducting resinl electro-conductive glass (FTO) (6cm*1cm) on, drip be coated be of a size of 1cm*1cm, is coated with 1 time, each 40 μ L, 80 DEG C of vacuum drying, obtain Bi
2o
3, NF-Bi
2o
3, Bi
2o
3-SBA and NF-Bi
2o
3-SBA electrode.
Four kinds of photochemical catalyst electrodes are placed in Na respectively
2sO
4(0.1mol/L), Na
2sO
3(0.1mol/L) in mixed solution, under electrochemical workstation 3 electrode system, take photochemical catalyst electrode as working electrode, platinized platinum is to electrode, silver electrode is reference electrode, and xenon lamp is light source, under ultraviolet-visible light, visible ray, alternately dark, obtain the density of photocurrent figure of photochemical catalyst electrode.
Fig. 1 (a), Fig. 1 (b) are respectively the density of photocurrent figure of three kinds of electrodes under ultraviolet-visible light, visible ray.
As can be seen from Fig. 1 (a), under ultraviolet-visible light, the photoelectric current difference of four kinds of photochemical catalysts is obvious, NF-Bi
2o
3-SBA electrode is compared to Bi before modified
2o
3, photoelectric current has very large lifting.It is compared to NF-Bi
2o
3, Bi
2o
3-SBA, photoelectric current also increases.
As can be seen from Fig. 1 (b), under visible light, Bi
2o
3photoelectric current is lower, and it is not high to the responsiveness of visible ray.NF-Bi
2o
3-SBA and Bi
2o
3comparing photoelectric current improves a lot, visible light-respondedly improves a lot.In addition, NF-Bi
2o
3the photoelectric current of-SBA is greater than NF-Bi
2o
3and Bi
2o
3the photoelectric current of-SBA, thus, the doping of NF and the introducing of SBA can improve Bi
2o
3visible light-responded.Thus, under visible light, light induced electron is more easily separated with hole, has more light induced electrons for the reduction of chromium, thus improves the treatment effect to chromate waste water.
Embodiment 3
By NF-Bi prepared by embodiment 2
2o
3, Bi
2o
3-SBA and NF-Bi
2o
3-SBA photochemical catalyst electrode is placed in the Na that concentration is 0.5mol/L respectively
2sO
4in solution, under electrochemical workstation 3 electrode system, take photochemical catalyst electrode as working electrode, platinized platinum is to electrode, and silver electrode is reference electrode, and xenon lamp is light source, respectively under visible light, in dark, obtains the AC impedance figure of photochemical catalyst electrode.
Fig. 2 is NF-Bi
2o
3the AC impedance figure of-SBA photochemical catalyst electrode under visible light, in dark.
Fig. 3 (a), Fig. 3 (b) be respectively three kinds of electrodes under visible light simultaneously, AC impedance figure in dark.
As shown in Figure 2, NF-Bi under illumination condition
2o
3the AC impedance ring radius of-SBA reduces to some extent.The separative efficiency right with photo-generate electron-hole due to the resistance sizes of the Charger transfer of photochemical catalyst is corresponding with the impedance ring radius size in figure, and NF-Bi is described
2o
3-SBA is under illumination condition, and the right separative efficiency of photo-generate electron-hole significantly improves, and charge transfer resistance reduces, and has good response to visible ray.
As Fig. 3 (a), Fig. 3 (b), no matter be under illumination or dark condition, NF-Bi
2o
3-SBA is than NF-Bi
2o
3and Bi
2o
3photo-generate electron-hole want high, therefore, through the photochemical catalyst NF-Bi that doping vario-property obtains to obtaining separative efficiency
2o
3-SBA, its charge-transfer resistance diminishes, and the rate of departure of photo-generate electron-hole accelerates.
Embodiment 4
Be in the chromate waste water of 80 μm of ol/L in Cr (VI) concentration, add NF-Bi
2o
3-SBA photochemical catalyst, regulates pH to be 3, is stirred to adsorption equilibrium in dark place, and fixing and light source position, opens xenon lamp (elimination wavelength is less than 420nm part), react.
Changing photochemical catalyst is photochemical catalyst NF-Bi prepared by embodiment 1
2o
3, Bi
2o
3-SBA, Bi
2o
3, carry out reduction chromium Contrast on effect, result is as Fig. 4.
As Fig. 4, under similarity condition, NF-Bi prepared by modification
2o
3-SBA compares NF-Bi
2o
3, Bi
2o
3reduction chromium effect all has lifting in various degree.At Bi
2o
3basis on load N, F time, it obtains obvious enhancing to Cr (VI) reducing property, and when using SBA15 as substrate, catalytic performance is compared to NF-Bi
2o
3to get back certain lifting.After 150min, NF-Bi
2o
3the clearance of-SBA to Cr (VI) reaches 42%, is about Bi
2o
32 times.
Embodiment 5
The present embodiment according to embodiment 3 chromium containing waste water treatment method, with NF-Bi
2o
3-SBA photochemical catalyst is invariant, and regulate initial pH value to be 2,3,4, other conditions are constant, when obtaining different pH value, and effect of chromium-containing wastewater treatment Fig. 5.
As can be seen from Figure 5: along with the clearance of the increase Cr (VI) of acidity constantly increases, obvious removal effect has been had as pH=3, by contrast, during pH=2, solution acidic is excessive, in actual applications, take too low pH value, can processing cost be increased, when therefore carrying out chromate waste water process, adopt pH=3 comparatively reasonable.
Embodiment 6
The existence of sacrifice agent, can affect NF-Bi
2o
3the effect of-SBA photocatalyst treatment chromate waste water.Under visible light illumination, NF-Bi
2o
3-SBA photochemical catalyst produces light induced electron and hole, and electronics is used for Cr (VI) to be reduced to Cr (III).EDTA is a kind of hole trapping agents, and can promote the generation of electronics while catching hole, its addition can affect the effect of photocatalyst treatment chromate waste water.
The present embodiment according to embodiment 3 chromium containing waste water treatment method, with NF-Bi
2o
3-SBA photochemical catalyst is invariant, the amount (0.5mL, 1mL, 1.5mL, concentration 0.001mmol/L) of the EDTA added when regulating initial, and other conditions are constant, when obtaining different EDTA amount, and effect of chromium-containing wastewater treatment Fig. 6.
As can be seen from Figure 6, after adding EDTA, the clearance of Cr (VI) obtains obvious lifting, and along with the increase of EDTA addition, the clearance of Cr (VI) constantly increases.But the increase of EDTA addition, the amplitude that the clearance of Cr (VI) increases is not obvious, so consider the processing cost of actual chromate waste water, EDTA addition is advisable with 0.5mL.
Embodiment 7
Intensity of illumination affects the separating effect in photochemical catalyst light induced electron and hole, thus has impact to the treatment effect of chromate waste water.Because intensity of illumination is wayward, the present embodiment changes intensity of illumination by controlling operating current.
The present embodiment according to embodiment 3 chromium containing waste water treatment method, with NF-Bi
2o
3-SBA photochemical catalyst is invariant, and changing xenon lamp operating current is 10A, 15A, 22A, and other conditions are constant, when obtaining different illumination intensity, and effect of chromium-containing wastewater treatment Fig. 7.
As can be seen from the result of Fig. 7, along with the operating current of light source increases, the clearance of Cr (VI) improves constantly.At operating current maximum (22A), when namely intensity of illumination is maximum, clearance also reaches the highest.This illustrates, intensity of illumination is for NF-Bi
2o
3the impact of-SBA photochemical catalyst catalytic performance is very large, when carrying out chromate waste water process, adjusts intensity of illumination as requested.
Embodiment 9
Based on embodiment 1, the present invention is also with the NH after oven dry
4f and Bi (NO
3)
3-SBA mass ratio is 1:1, and have studied Bi (NO according to embodiment 2 ~ 8
3)
35H
2the performance of the photochemical catalyst that O and SBA mass ratio other mass ratioes within the scope of 0.52 ~ 2.08:1 prepare, Detection results can reach the level in embodiment 2 ~ 8 substantially.
Claims (10)
1. a NF-Bi
2o
3-SBA visible light responsive photocatalyst, is characterized in that, by NH
4f, Bi (NO
3)
35H
2o and SBA molecular sieve is made, wherein Bi (NO
3)
35H
2o and SBA mass ratio is 0.52 ~ 2.08:1, NH
4f and Bi (NO
3)
3-SBA mass ratio is 0.8 ~ 1.2:1.
2. a NF-Bi
2o
3the preparation method of-SBA visible light responsive photocatalyst, is characterized in that, comprises the steps:
(1) by Bi (NO
3)
35H
2o is dissolved in ethylene glycol, then adds SBA molecular sieve, dispersed post-drying, grinds to obtain Bi (NO
3)
3-SBA powder;
(2) by the NH after oven dry
4f is partly dissolved in ethanol, with Bi (NO
3)
3-SBA powder mull is evenly calcined afterwards; Photochemical catalyst NF-Bi is obtained through post processing after calcining
2o
3-SBA.
3. NF-Bi according to claim 2
2o
3the preparation method of-SBA visible light responsive photocatalyst, is characterized in that, Bi (NO in step (1)
3)
35H
2o and SBA mass ratio is 0.52 ~ 2.08:1.
4. NF-Bi according to claim 2
2o
3the preparation method of-SBA visible light responsive photocatalyst, is characterized in that, the NH after drying in step (1)
4f and Bi (NO
3)
3-SBA mass ratio is 0.8 ~ 1.2:1.
5. NF-Bi according to claim 2
2o
3the preparation method of-SBA visible light responsive photocatalyst, is characterized in that, in step (2), during calcining, controling parameters is: 3 ~ 8 DEG C/min is warming up to 450 DEG C ~ 550 DEG C, keeps 150 ~ 200min.
6. the NF-Bi that as described in a claim as arbitrary in claim 2 ~ 5, preparation method prepares
2o
3-SBA photochemical catalyst.
7. one kind utilizes NF-Bi as described in claim 1 or 6
2o
3the method of-SBA photocatalyst treatment chromate waste water, is characterized in that, comprise the steps:
NF-Bi as described in claim 1 or 6 is added to containing in Cr (VI) waste water
2o
3-SBA photochemical catalyst, regulate pH, be stirred to adsorption equilibrium in dark place, radiation of visible light reacts.
8. method according to claim 7, is characterized in that, regulates pH value of waste water to be 2 ~ 4.
9. method according to claim 7, it is characterized in that, the light source of described visible ray is xenon lamp, and the operating current controlling xenon lamp is 10A ~ 22A.
10. method according to claim 7, is characterized in that, be also added with EDTA hole trapping agents containing in Cr (VI) waste water.
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| CN107555526A (en) * | 2017-09-26 | 2018-01-09 | 浙江工商大学 | A kind of method of composite visible light catalyst processing waste water containing chrome |
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| CN101653732A (en) * | 2009-09-29 | 2010-02-24 | 福州大学 | Molecular sieve loaded BiOX photocatalyst, preparation method and application thereof |
| CN102167437A (en) * | 2011-03-28 | 2011-08-31 | 河南理工大学 | Photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and preparation method of catalytic agent |
| CN104607225A (en) * | 2015-01-01 | 2015-05-13 | 宁波帝杨电子科技有限公司 | Preparation method of nitrogen doped loaded Bi203/Si02 light catalyst |
| CN104724788A (en) * | 2015-02-12 | 2015-06-24 | 浙江工商大学 | Ferric oxide, graphene oxide and N-F codoped visible light response electrode as well as preparation method and application thereof |
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| CN101653732A (en) * | 2009-09-29 | 2010-02-24 | 福州大学 | Molecular sieve loaded BiOX photocatalyst, preparation method and application thereof |
| CN102167437A (en) * | 2011-03-28 | 2011-08-31 | 河南理工大学 | Photochemical method for removing organic phenolic pollutants and hexavalent chromium in water body and preparation method of catalytic agent |
| CN104607225A (en) * | 2015-01-01 | 2015-05-13 | 宁波帝杨电子科技有限公司 | Preparation method of nitrogen doped loaded Bi203/Si02 light catalyst |
| CN104724788A (en) * | 2015-02-12 | 2015-06-24 | 浙江工商大学 | Ferric oxide, graphene oxide and N-F codoped visible light response electrode as well as preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107555526A (en) * | 2017-09-26 | 2018-01-09 | 浙江工商大学 | A kind of method of composite visible light catalyst processing waste water containing chrome |
| CN107555526B (en) * | 2017-09-26 | 2020-10-13 | 浙江工商大学 | Method for treating chromium-containing wastewater by using composite visible-light catalyst |
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