CN107081153A - The method that one kind is based on catalyst photo catalytic reduction Cr (VI) - Google Patents
The method that one kind is based on catalyst photo catalytic reduction Cr (VI) Download PDFInfo
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 47
- 239000003054 catalyst Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 27
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000007146 photocatalysis Methods 0.000 claims abstract description 26
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 22
- 230000015556 catabolic process Effects 0.000 claims abstract description 5
- 238000006731 degradation reaction Methods 0.000 claims abstract description 5
- 238000005273 aeration Methods 0.000 claims abstract description 4
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000001179 sorption measurement Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000009833 condensation Methods 0.000 claims description 17
- 230000005494 condensation Effects 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 230000035484 reaction time Effects 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 229910002554 Fe(NO3)3·9H2O Inorganic materials 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000001802 infusion Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005119 centrifugation Methods 0.000 claims 1
- 238000002242 deionisation method Methods 0.000 claims 1
- 238000002803 maceration Methods 0.000 claims 1
- 238000005070 sampling Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 6
- 229910021645 metal ion Inorganic materials 0.000 abstract description 2
- 239000011651 chromium Substances 0.000 description 99
- 238000006243 chemical reaction Methods 0.000 description 15
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 11
- 229910052804 chromium Inorganic materials 0.000 description 11
- 238000006722 reduction reaction Methods 0.000 description 7
- 239000002893 slag Substances 0.000 description 7
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 3
- 238000013032 photocatalytic reaction Methods 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 206010070840 Gastrointestinal tract irritation Diseases 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 208000002454 Nasopharyngeal Carcinoma Diseases 0.000 description 1
- 206010061306 Nasopharyngeal cancer Diseases 0.000 description 1
- 206010028813 Nausea Diseases 0.000 description 1
- 208000007107 Stomach Ulcer Diseases 0.000 description 1
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- 238000005868 electrolysis reaction Methods 0.000 description 1
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- 230000009395 genetic defect Effects 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
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- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
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- 239000004575 stone Substances 0.000 description 1
- 239000003115 supporting electrolyte Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/745—Iron
-
- B01J35/39—
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention belongs to metal ion treatment technical field, it is related to a kind of method for being based on catalyst photo catalytic reduction Cr (VI), first by Fe3+/TiO2Photochemical catalyst is added to stirred in potassium bichromate solution after adjust pH value of solution, obtain mixed liquor, then mixed liquor poured into bottom setting in the self-control photo catalysis reactor of aeration board, persistently expose air until Cr (VI) is in Fe3+/TiO2Catalyst surface and reactor inner surface reach adsorption equilibrium；Then connect ultraviolet source and carry out Fe3+/TiO2Cr (VI) light-catalyzed reaction is reduced, Cr (VI) deoxidization, degradation is realized；Its method is simple, and easy to operate, cost is low, photo catalytic reduction efficiency high, without adding other chemical substances, non-secondary pollution into photo catalytic reduction reaction system.
Description
Technical field：
The invention belongs to metal ion treatment technical field, it is related to a kind of method of photo catalytic reduction degraded Cr (VI), it is special
It is not that one kind is based on Fe3+/TiO2Catalyst photo catalytic reduction Cr (VI) method, safely and efficiently remove Heavy Metals in Waters from
Sub- Cr (VI).
Background technology：
Cr VI Cr (VI) pollutant mostlys come from mining, metallurgy, plating, process hides, bichromate Chemical Manufacture and chromium
The industries such as Slag treatment, above-mentioned industry can produce a large amount of effluent containing heavy metal ions containing chromium in Chemical Manufacture or waste treatment process,
The below standard discharge of the effluent containing heavy metal ions containing chromium causes severe contamination to water environment, soil environment and ecological environment.Preparing
During bichromate, 1 ton of bichromate is often produced, 3.5 tons or so of chromium slag, according to incompletely statistics, current state will be produced
Ten thousand tons of chromium slags of 20-30 are at least discharged in interior metallurgical and chemical industry every year, and contain substantial amounts of extremely toxic substance Cr (VI) in chromium slag.Containing chromium
The discharge of waste water and dealing with improperly for chromium slag can cause huge harm to ecological environment, a such as 2011 " Qujing of Yunnan huge sum of moneys
Category Cr (VI) pollution reservoirs event " causes substantial pollution (because 5000 tons of chromium slags pour into reservoir, to cause reservoir fatal to local water source
Exceeded 2000 times of Cr (VI)), the event socially generates very big repercussion, also result in people's heavy metal ionic soil and
The very big concern of harm.Cr (VI) is the property swallowed/imbedibility pollutant, and is easy to be absorbed by the body.Domestic and international a large amount of toxicitys
Learning research confirms, is chronically exposed to the human body in Cr (VI) environment, not only skin can produce allergic phenomena, and other organs
Can occur the illnesss such as inherited genetic defects.Cr (VI) has bioaccumulation, biopersistence and the big characteristic of refractory organicses three,
Entered by respiratory system after human body, can not only make Atrophic nasal mucosas, cause rhinelcos, nose is bleeding and perforation of nasal septum, and then
Deteriorate as nasopharyngeal carcinoma；But also lung can be made to occur organic disease, easily induce lung cancer；It enters human body by digestive system
Afterwards, the damaging of liver and kidney, nausea, GI irritation, gastric ulcer, gastrospasm can be caused even dead.
Recognize Cr (VI) environment and ecological hazard, domestic and international many scholars are thrown oneself into Cr (VI) environmental improvement.
In acid condition, Cr (VI) oxidisability and stability is relatively strong, it is difficult to be oxidized degraded.At present, water body or chromium slag are removed
In leachate Cr (VI) method mainly have chemical precipitation method, ion-exchange, absorption method, membrane separation process, electrolytic reduction and
The method such as chemical reagent reducing process etc., wherein chemical precipitation, ion exchange, absorption and UF membrane simply mutually turns Cr (VI) from one
Move on in an other phase, not only can not fundamentally remove Cr (VI), and easily produced in follow-up Cr (VI) processing procedure
Raw secondary pollution；Electrolysis is the method that Cr (VI) is rapidly converted into Cr (III) under the conditions of certain voltage, because Cr
(III) toxicity is far below Cr (VI) toxicity, so electroreduction is safer removal Cr (VI) method, but in order to
Higher electrolytic efficiency is maintained, it is necessary to apply high voltage to reaction system, and supporting electrolyte is continuously replenished into solution, because
This processing cost is improved；TiO2Photo catalytic reduction is a kind of safer, green and environment-friendly water technology, TiO2It is
A kind of environment-friendly catalysis material, under ultraviolet light, its surface produces the extremely strong light induced electron of reproducibility, and they can have
Cr (VI) is reduced to Cr (III) by effect ground.In TiO2During photo catalytic reduction processing Cr (VI), because need not be to reaction
System adds other chemical substances, so the potential hazard of reaction cost and secondary pollution is reduced, but existing TiO2Light
Catalytic reduction method is inefficient.Therefore, a kind of raising TiO is sought2Reduce Cr (VI) photocatalysis efficiency, based on Fe3+/TiO2
Catalyst photo catalytic reduction Cr (VI) method.
The content of the invention：
It is an object of the invention to overcome the shortcoming that prior art is present, seek to design a kind of green, safe and efficient base
In Fe3+/TiO2Catalyst photo catalytic reduction Cr (VI) method, using homemade Fe3+/TiO2Catalyst, is urged in homemade light
Change in reactor and study Fe3+/TiO2Photo catalytic reduction degraded Cr (VI) reaction and kinetics of reduction, are actual useless containing chromium
The processing of water provides theoretical direction and technical support.
To achieve these goals, the present invention uses Fe3+/TiO2Catalyst photo catalytic reduction Cr (VI) detailed process
For：
(1) first by Fe3+/TiO2Photochemical catalyst is added in the potassium bichromate solution that concentration is 1~8mg/L and stirred,
Then with NaOH or HCl regulation pH value of solution, the mixed liquor that solution ph is 1~9, wherein Fe in mixed liquor are obtained3+/TiO2Light is urged
The concentration of agent is 0.5~5g/L；
(2) mixed liquor is poured into bottom to set in the self-control photo catalysis reactor of aeration board, persistently exposes air until Cr (VI)
In Fe3+/TiO2Catalyst surface and reactor inner surface reach adsorption equilibrium；
(3) absorption is reached after balance, connects ultraviolet source, and it is 280~320mW/cm to control ultraviolet radiation intensity2, enter
Row Fe3+/TiO2Cr (VI) light-catalyzed reaction is reduced, the reaction time is 60min, realizes Cr (VI) deoxidization, degradation.
Fe of the present invention3+/TiO2Photochemical catalyst is with P25TiO2Catalyst is carrier, Fe (NO3)3·9H2O is dipping
Liquid, is prepared using ultrasound-infusion process, and specific preparation process is as follows：First weigh 5g TiO2Powder inserts 100ml concentration
0.1mol/L Fe (NO3)3·9H2In O solution, 20min is centrifuged after ultrasound-dipping 60min, then will centrifuge consolidating of obtaining
Body is transferred in Muffle furnace 2~3h of calcining under 300~400 DEG C of cryogenic conditions and obtains white hardened solid, then will obtain white
Colour table knot solid is slightly ground, and is cleaned more than 5 times, is finally transferred into baking oven with deionized water, is dried at a temperature of 90 DEG C
Dry, slight grinding crosses 100 mesh sieves standby.
The agent structure of self-control photo catalysis reactor of the present invention includes the first standby sample tap, condensation cycle water and gone out
Mouth, the second standby sample tap, solarization air cap, condensation cycle water inlet, middle part sample tap, the 3rd standby sample tap, quartz socket tube and
Reactor shell；The outermost layer and innermost layer of reactor shell are mounted on glass tube, and quartz socket tube is deep into reactor shell
Inside, for placing ultraviolet lamp tube；The upper left-hand of reactor shell is provided with the first standby sample tap successively from top to bottom, cold
Solidifying circulating water outlet and the second standby sample tap, the right side of reactor shell be provided with successively from bottom to top condensation cycle water inlet,
Middle part sample tap and the 3rd standby sample tap, solarization air cap are arranged on the bottom of reactor shell, the first standby sample tap, second standby
It is connected with sample tap, middle part sample tap, the 3rd standby sample tap and solarization air cap with reactor shell innermost layer glass tube；Condensation
Circulation water inlet and condensation cycle water out are connected with reactor shell outermost layer glass tube.
The present invention is with Fe3+/TiO2For catalyst, Fe is studied3+/TiO2Efficiently reduction Cr (VI) light-catalyzed reaction, with
Lower four features：One is Fe3+/TiO2Photo catalytic reduction Cr (VI) reactions are carried out in homemade photo catalysis reactor；Two are
Fe3+/TiO2The photocatalysis rate for reducing Cr (VI) is higher than TiO2Photo catalytic reduction efficiency；Three be Fe3+/TiO2Reduce Cr (VI) light
Catalytic efficiency is up to 99.8%；Four be Fe3+/TiO2Reduction Cr (VI) light-catalyzed reaction meets First-order kinetics equation, and half
Decline phase shorter only 7.85min.
There is provided a kind of new method of safe efficient reduction Cr (VI), the letter of its method compared with prior art by the present invention
Single, easy to operate, cost is low, photo catalytic reduction efficiency high, without adding other chemicals into photo catalytic reduction reaction system
Matter, non-secondary pollution.
Brief description of the drawings：
Fig. 1 is catalyst amount of the embodiment of the present invention to Fe3+/TiO2Reduce the influence curve of Cr (VI) photocatalysis efficiency
Figure.
Fig. 2 is Cr of the embodiment of the present invention (VI) initial concentration to Fe3+/TiO2The influence for reducing Cr (VI) photocatalysis efficiency is bent
Line chart.
Fig. 3 is reaction solution of embodiment of the present invention pH to Fe3+/TiO2Reduce the influence curve figure of Cr (VI) photocatalysis efficiency.
Fig. 4 is Fe of the embodiment of the present invention3+/TiO2Reduce Cr (VI) light-catalyzed reaction dynamic curve diagram.
Fig. 5 is the agent structure principle schematic of the present invention for making photo catalysis reactor by oneself.
Embodiment：
Below by embodiment and the invention will be further described with reference to accompanying drawing.
The present embodiment uses Fe3+/TiO2Catalyst photo catalytic reduction Cr (VI) detailed process is：
(4) first by Fe3+/TiO2Photochemical catalyst is added in the potassium bichromate solution that concentration is 1~8mg/L and stirred,
Then with NaOH or HCl regulation pH value of solution, the mixed liquor that solution ph is 1~9, wherein Fe in mixed liquor are obtained3+/TiO2Light is urged
The concentration of agent is 0.5~5g/L；
(5) mixed liquor is poured into bottom to set in the self-control photo catalysis reactor of aeration board, persistently exposes air until Cr (VI)
In Fe3+/TiO2Catalyst surface and reactor inner surface reach adsorption equilibrium；
(6) absorption is reached after balance, connects ultraviolet source, and it is 280~320mW/cm to control ultraviolet radiation intensity2, enter
Row Fe3+/TiO2Cr (VI) light-catalyzed reaction is reduced, the reaction time is 60min, realizes Cr (VI) deoxidization, degradation.
Fe described in the present embodiment3+/TiO2Photochemical catalyst is with P25TiO2Catalyst is carrier, Fe (NO3)3·9H2O is dipping
Liquid, is prepared using ultrasound-infusion process, and specific preparation process is as follows：First weigh 5g TiO2Powder inserts 100ml concentration
0.1mol/L Fe (NO3)3·9H2In O solution, 20min is centrifuged after ultrasound-dipping 60min, then will centrifuge consolidating of obtaining
Body is transferred in Muffle furnace 2~3h of calcining under 300~400 DEG C of cryogenic conditions and obtains white hardened solid, then will obtain white
Colour table knot solid is slightly ground, and is cleaned more than 5 times, is finally transferred into baking oven with deionized water, is dried at a temperature of 90 DEG C
Dry, slight grinding crosses 100 mesh sieves standby.
Making the agent structure of photo catalysis reactor described in the present embodiment by oneself includes the first standby sample tap 1, condensation cycle water
Export the 2, second standby sample tap 3, solarization air cap 4, condensation cycle water inlet 5, middle part sample tap 6, the 3rd standby sample tap 7, stone
English sleeve pipe 8 and reactor shell 9；The outermost layer and innermost layer of reactor shell 9 are mounted on glass tube, and quartz socket tube 8 gos deep into
To the inside of reactor shell 9, for placing ultraviolet lamp tube；The upper left-hand of reactor shell 9 is provided with successively from top to bottom
One standby sample tap 1, the standby sample tap 3 of condensation cycle water out 2 and second, the right side of reactor shell 9 is from bottom to top successively
Condensation cycle water inlet 5, the standby sample tap 7 of middle part sample tap 6 and the 3rd are provided with, solarization air cap 4 is arranged on the bottom of reactor shell 9
Portion, the first standby sample tap 1, the second standby sample tap 3, middle part sample tap 6, the 3rd standby sample tap 7 and solarization air cap 4 with instead
The innermost layer glass tube of device housing 9 is answered to be connected；Condensation cycle water inlet 5 and condensation cycle water out 2 with the outermost of reactor shell 9
Layer glass tube is connected.
The present embodiment is to Fe3+/TiO2Reduction Cr (VI) light-catalyzed reaction is studied, and primarily looks at influence Fe3+/TiO2Also
The experiment condition of former Cr (VI) light-catalyzed reaction, such as：Fe3+/TiO2Consumption, Cr (VI) initial concentrations and the reaction solution of catalyst
pH；Then Fe is set up3+/TiO2Cr (VI) light-catalyzed reaction dynamics is reduced, light-catalyzed reaction speed constant and half-life period is calculated.
Embodiment 1：Catalyst amount is to Fe3+/TiO2Reduce the influence of Cr (VI) photocatalysis efficiency
The present embodiment prepares five parts of same concentration, Cr (VI) solution of same volume, using the Fe of different amounts3+/TiO2Catalysis
Agent starts light-catalyzed reaction by above-mentioned photo catalytic reduction course of reaction, and photocatalytic reaction conditions are as follows：The light-catalyzed reaction time is
60min, ultraviolet radiation intensity are 280-320mW/cm2, Cr (VI) solution pH value be 3, catalyst amount is to Fe3+/TiO2
The influence result of Cr (VI) photocatalysis efficiency is reduced as shown in figure 1, it can be seen from Fig. 1 that Fe3+/TiO2Reduce Cr (VI) photocatalysis effect
Rate is with catalyst Fe3+/TiO2The increase of consumption shows the trend of first increases and then decreases, and optimal catalyst amount is 2g/L；
When catalyst amount is 0g/L, Cr (VI) is not reduced degraded, it can be seen that independent ultraviolet light does not have drop to Cr (VI)
Solution is acted on；When catalyst amount is less than 2g/L, with the increase of catalyst amount, the concentration of catalyst is carried in Cr (VI) solution
Height, increase Cr (VI) and Fe3+/TiO2Collision, absorption, the probability of deoxidization, degradation and desorption, so as to improve photo catalytic reduction efficiency；
But when catalyst amount is more than 2g/L, with the increase of catalyst amount, Cr (VI) solution becomes more and more muddy, more
Fe3+/TiO2Particle not only blocks the absorption of ultraviolet light, but also light reflection ultraviolet so that the catalyst inside solution rises not
To photocatalysis, so as to suppress photocatalysis efficiency.
Embodiment 2：Cr (VI) initial concentration is to Fe3+/TiO2Reduce the influence of Cr (VI) photocatalysis efficiency
The present embodiment prepares Cr (VI) solution of five parts of same volume various concentrations, is opened by above-mentioned photo catalytic reduction course of reaction
Dynamic light-catalyzed reaction, photocatalytic reaction conditions are as follows：The light-catalyzed reaction time is that 60min, ultraviolet radiation intensity are 280-
320mW/cm2, Cr (VI) solution pH value be that 3, catalyst amount is 1g/L, Cr (VI) initial concentration solution is to Fe3+/TiO2Also
The influence result of former Cr (VI) photocatalysis efficiency by Fig. 2 as shown in Fig. 2 found out：Fe3+/TiO2Reduce Cr (VI) photocatalysis efficiency
Reduce with the increase of Cr (VI) initial concentration solution, under conditions of catalyst amount is constant, because Cr (VI) solution is initial
Concentration is bigger, and the catalytic amount contained in unit concentration Cr (VI) solution declines, so Fe3+/TiO2Photocatalysis efficiency is reduced.
Embodiment 3：Reaction solution pH is to Fe3+/TiO2Reduce the influence of Cr (VI) photocatalysis efficiency
The present embodiment prepares five parts of same concentration, same volume, Cr (VI) solution of different pH value, anti-by above-mentioned photo catalytic reduction
Process is answered to start light-catalyzed reaction, photocatalytic reaction conditions are as follows：The light-catalyzed reaction time is 60min, ultraviolet radiation intensity
For 280-320mW/cm2, catalyst amount be 1g/L, Cr (VI) pH value of solution is to Fe3+/TiO2Reduce Cr (VI) photocatalysis efficiency
Result is influenceed as shown in figure 3, as seen from Figure 3, Fe3+/TiO2Cr (VI) photocatalysis efficiency is reduced with reacting solution pH value
Increase and reduce, optimal pH value is 1, as a result proves Fe3+/TiO2Reduce Cr (VI) light-catalyzed reaction easily molten in highly acid
Carried out in liquid.
Embodiment 4：Fe3+/TiO2Reduce Cr (VI) light-catalyzed reaction dynamics
The present embodiment studies Fe to provide theoretical direction and technical support containing Cr (VI) wastewater treatment to actual3+/TiO2Also
Former Cr (VI) light-catalyzed reaction dynamics, and reaction rate constant and half-life period are calculated, first set up reaction time t and ln (C0/C)
Functional relation, wherein C0For Cr (VI) initial concentration, C is the concentration of a certain moment Cr (VI), functional relation such as Fig. 4 institutes
Show, under following experiment condition：Cr (VI) initial concentration is 2mg/L, Fe3+/TiO2Dosage is 2g/L, and pH value of solution is 1,
In 40min and 60min reaction time, Fe3+/TiO2Reduce Cr (VI) photocatalysis efficiency and be up to 97.9% and 99.8% respectively,
This explanation Fe3+/TiO2Reaction has very strong photo catalytic reduction efficiency, in preceding 40min, Fe it can be seen from Fig. 4 interior illustration3+/
TiO2Reduction Cr (VI) reactions substantially meet First-order kinetics equation, and reaction rate constant is 0.0584min-1, reaction half
The phase decline for 7.85min.
Claims (3)
1. the method that one kind is based on catalyst photo catalytic reduction Cr (VI), it is characterised in that detailed process is：
(1) first by Fe3+/TiO2Photochemical catalyst is added in the potassium bichromate solution that concentration is 1~8mg/L and stirred, then
With NaOH or HCl regulation pH value of solution, the mixed liquor that solution ph is 1~9, wherein Fe in mixed liquor are obtained3+/TiO2Photochemical catalyst
Concentration be 0.5~5g/L；
(2) mixed liquor is poured into bottom to set in the self-control photo catalysis reactor of aeration board, persistently exposes air until Cr (VI) is in Fe3 +/TiO2Catalyst surface and reactor inner surface reach adsorption equilibrium；
(3) absorption is reached after balance, connects ultraviolet source, and it is 280~320mW/cm to control ultraviolet radiation intensity2, carry out Fe3 +/TiO2Cr (VI) light-catalyzed reaction is reduced, the reaction time is 60min, realizes Cr (VI) deoxidization, degradation.
2. catalyst photo catalytic reduction Cr (VI) method is based on according to claim 1, it is characterised in that the Fe3+/
TiO2Photochemical catalyst is with P25TiO2Catalyst is carrier, Fe (NO3)3·9H2O is maceration extract, is prepared into using ultrasound-infusion process
Arrive, specific preparation process is as follows：First weigh 5g TiO2Powder inserts the Fe (NO that 100ml concentration is 0.1mol/L3)3·9H2O is molten
In liquid, 20min is centrifuged after ultrasound-dipping 60min, then the solid that centrifugation is obtained is transferred in Muffle furnace 300~400
2~3h of calcining obtains white hardened solid under DEG C cryogenic conditions, then will obtain white hardened solid and slightly grind, and use deionization
Water is cleaned more than 5 times, is finally transferred into baking oven, is dried at a temperature of 90 DEG C, slight grinding, crosses 100 mesh sieves standby.
3. catalyst photo catalytic reduction Cr (VI) method is based on according to claim 1, it is characterised in that the self-control light
The agent structure of catalytic reactor include the first standby sample tap, condensation cycle water out, the second standby sample tap, solarization air cap,
Condensation cycle water inlet, middle part sample tap, the 3rd standby sample tap, quartz socket tube and reactor shell；Reactor shell is most
Outer layer and innermost layer are mounted on glass tube, and quartz socket tube is deep into the inside of reactor shell, for placing ultraviolet lamp tube；Instead
The upper left-hand of device housing is answered to be provided with the first standby sample tap, condensation cycle water out and the second standby sampling successively from top to bottom
Mouthful, the right side of reactor shell is provided with condensation cycle water inlet, middle part sample tap and the 3rd standby sample tap successively from bottom to top,
Solarization air cap is arranged on the bottom of reactor shell, the first standby sample tap, the second standby sample tap, middle part sample tap, the 3rd standby
It is connected with sample tap and solarization air cap with reactor shell innermost layer glass tube；Condensation cycle water inlet and condensation cycle water out
It is connected with reactor shell outermost layer glass tube.
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Cited By (2)
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| CN108607597A (en) * | 2018-05-24 | 2018-10-02 | 青岛理工大学 | A kind of method of photo catalytic reduction Cr (VI) under visible light |
| CN112794491A (en) * | 2020-12-10 | 2021-05-14 | 西南兵工重庆环境保护研究所有限公司 | Combined water treatment process for removing hexavalent chromium in wastewater |
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| CN108607597A (en) * | 2018-05-24 | 2018-10-02 | 青岛理工大学 | A kind of method of photo catalytic reduction Cr (VI) under visible light |
| CN112794491A (en) * | 2020-12-10 | 2021-05-14 | 西南兵工重庆环境保护研究所有限公司 | Combined water treatment process for removing hexavalent chromium in wastewater |
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