CN101863524B - Photocatalytic oxidation degradation method of wastewater containing dye - Google Patents
Photocatalytic oxidation degradation method of wastewater containing dye Download PDFInfo
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- CN101863524B CN101863524B CN2010101978456A CN201010197845A CN101863524B CN 101863524 B CN101863524 B CN 101863524B CN 2010101978456 A CN2010101978456 A CN 2010101978456A CN 201010197845 A CN201010197845 A CN 201010197845A CN 101863524 B CN101863524 B CN 101863524B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention belongs to the field of sewage treatment, in particular to a method for degrading wastewater containing dye under the irradiation of sunlight by taking a Pt nanowire as a light catalyst, which comprises the following steps: (1)taking the Pt nanowire with the diameter less than 3nm as the light catalyst, adding the light catalyst into the wastewater containing the dye to be treated, suspending and dispersing the light catalyst in the wastewater containing dye under the conditions of natural light and stirring, and carrying out catalytic oxidation reaction for 20 to 480min; and (2) stopping the stirring, sinking the PT nanowire into the bottom of water, discharging the wastewater on an upper layer which is treated, recovering the light catalyst, flushing with water for 2 to 3min, and reusing. By taking the sunlight as a light source, the method has the advantages of energy saving, low cost and simple operation; and in addition, the Pt nanowire has the advantages of high photocatalytic activity, stable performance, simple regeneration, reusability and no secondary pollution, and is applicable to large-scale production.
Description
Technical field
The invention belongs to sewage treatment area, be specifically related to a kind of Pt of employing nano wire as under solar light irradiation, the degrade method of the waste water that contains dyestuff of photocatalyst.
Background technology
Along with developing rapidly of textile industry, the kind and the quantity of dyestuff increase day by day, and DYE PRODUCTION and dyeing waste water have become one of major polluting sources of water surrounding.According to statistics, in the DYE PRODUCTION process, 1 ton of dyestuff of every production will lose 2% product with waste water.And loss amount is bigger in dyeing process, is about 10% of used dyestuff.Waste water from dyestuff has characteristics such as colourity height, inorganic salt content are high, composition is complicated, biodegradability is poor, decolouring difficulty, and contains the multiple organism that has bio-toxicity or cause " three cause " (carcinogenic, teratogenesis, mutagenesis) performance.Even dye component concentration remaining in the waste water is very low, enter water body and also can cause the transmittance of water body to reduce, and the destruction that causes water ecosystem the most at last.Therefore, effectively dye wastewater treatment using has important theory and realistic meaning.
At present, the treatment process to waste water from dyestuff mainly comprises physics method, biochemical process, chemical method etc.Gac is a kind of physics method commonly used, but owing to be difficult for regeneration, treatment effect is undesirable, and its application is restricted; 20th century of membrane separation technique have begun industrial applications; Being applied to the dye wastewater treatment aspect mainly is ultrafiltration and r-o-, but because the existence of problems such as concentration polarization and film pollution causes permeation flux in service to descend with the prolongation of working time; The price of film is more expensive simultaneously; The replacing frequency is very fast, so processing cost is higher, thereby seriously hinders the more massive industrial application of membrane separation technique.Biological process is low because of its running cost, treatment effect is good is used widely, but not ideal to the clearance of colourity.The processing cost of chemical oxidation and electrochemical oxidation is higher relatively, and particularly advanced oxidation processes is in the laboratory study stage at present mostly, does not obtain practical application as yet.Though the Zero-valent Iron reduction method is a kind of important method of dye wastewater treatment using always, the reduction rate of common Zero-valent Iron is slow, efficient is lower.And the photochemical method that grew up in the last few years provides good solution route for the processing that solves poisonous and hazardous difficult degradation persistent organism in the environment.
The patent No. is that 200610024195.9 Chinese invention patent discloses " method of malachite green in a kind of degrading waste water "; This technology uses that content is the malachite green of 10mg/L in the 185nm ultraviolet degradation waste water; The flow velocity of waste water by 40-160L/h circulated in photoreactor, and degradation rate reaches more than 99% in the 40min.But this technology only is applicable to degrading malachite green.
Application number is that 03137562.6 Chinese invention patent ublic specification of application discloses " a kind of photocatalysis oxidation method that is used for dye wastewater treatment ", and this method is used particulate state TiO
2Photocatalyst and fluidized-bed reactor, and use lower powered uv lamp to shine as electric light source, blast air simultaneously, make catalyzer in reactor drum, be fluidized state, this method can reach 69-95% to dye decolored rate, total organic carbon removing rate 47-75%.This method needs equipment such as fluidized-bed, uv lamp.
Two kinds of main artificial light of light source that photochemical method is commonly used and sunshines.Artificial light typically uses the high pressure uv lamp as light source, on the one hand, has a large amount of luminous energy and is converted into heat energy, and energy scatters and disappears, and light utilization efficiency is low; On the other hand, this light source need dispose stable-pressure device and cooling system, will cause complicated operation like this, and expense increases.Sunshine is operated simpler then more economically.
Therefore, in order better to solve the waste water from dyestuff pollution problem, with regard to a kind of efficient, simple, economic and safe treatment process of needs.
Summary of the invention
The object of the invention provides a kind of method of photocatalytic oxidation degradation waste water containing dye.
For achieving the above object; The technical scheme that the present invention adopts is: a kind of method of photocatalytic oxidation degradation waste water containing dye; Under the natural lighting condition, under the agitation condition, make photocatalyst suspended dispersed in containing the waste water of dyestuff; Utilize the dyestuff in the airborne Oxygen Catalytic Oxidation degrading waste water, recycle photocatalyst; Said photocatalyst is platinum (Pt) nano wire of diameter less than 3nm; Specifically may further comprise the steps:
(1) be photocatalyst with diameter less than platinum (Pt) nano wire of 3nm; In pending waste water containing dye, add photocatalyst, under the natural lighting condition, under the agitation condition; Make photocatalyst suspended dispersed in containing the waste water of dyestuff, catalytic oxidation 2～480 minutes;
(2) stop to stir, platinum (Pt) nano wire sinks under water, and discharges the upper strata and handles waste water, reclaims photocatalyst, and water flushing 2-3 can reuse after clean.
In the technique scheme, every 1L waste water need add photocatalyst 10-100mg; The preparation method of said photocatalyst Pt nano wire is a prior art; Can reference: Angew.Chem.Int.Ed.2007; 46; The document " universal method of synthetic Fe-Pt nano wire and nanometer rod " (A GeneralStrategy for Synthesizing FePt Nanowires and Nanorods) that 6333-6335 is last; Be specially: first preparation Fe-Pt nano wire, then the Fe-Pt nano wire is scattered in the methanol solution, add again hydrochloric acid HCl and acetic acid HAc stir respectively under 60-70 ℃ removed outer Fe in 1-3 hour after centrifugal making.
In the technique scheme, said catalytic oxidation carries out under the solar light irradiation in air ambient.If solar irradiation less than the place, can be used as light source with ir lamp.
In the technique scheme, the dyestuff in the said waste water that contains dyestuff includes but not limited to: rhodamine b, the pink B of slightly acidic, DISPERSE NAVY BLUE EXSF 300& BLUE 56 100 HGL, DISPERSE BLUE 2BLN, acid peach GS, indigo K-3R, acid bright red 10B, dyestuff D1, the emerald green blue GL of sun-proof, lucifer yellow 8GFF, water-soluble purple
In the optimized technical scheme, the concentration of dyestuff is 5-60mg/L in the waste water.
Because the technique scheme utilization, the present invention compared with prior art has advantage:
1, to adopt natural light be light source in the present invention, utilizes the Pt nano wire to be photocatalyst, and the dyestuff in the catalyzing oxidizing degrading waste water owing to select for use sunshine as light source, therefore has save energy, and cost is low, advantage simple to operate; And Pt nano wire photocatalytic activity is high, stable performance, and regeneration is simple, can reuse, and can not cause secondary pollution, is fit to large-scale production and application;
2, adopt the Pt nano wire among the present invention, through the mode that stirs can be in waste water suspended dispersed, need not use equipment such as fluidized-bed, not high to equipment and processing requirement; If the use nano particle in whipping process reunion to a certain degree can take place, influence catalytic effect;
3, technical scheme of the present invention is applied widely, and is better to the photocatalytic degradation effect of the dye composition of multiple difficult degradation, no matter be azo also be non-azo, tart is alkalescence still, fine degradation effect is all arranged, and do not need special processing.
Embodiment
Below in conjunction with embodiment the present invention is further described:
Following examples dye wastewater is industrial common dyes and deionized water.
Used instrument mainly contains U-3900 UV, visible light luminosity meter, magnetic stirring apparatus etc.
In the finite concentration scope, the concentration of dyestuff and its absorbancy meet lambert-law of Beer:
The concentration and the relation between the liquid layer thickness of absorbancy, solution are following:
A＝εbc
(A is an absorbancy, and ε is a molar absorptivity, and b is a liquid pool thickness, and c is a strength of solution).
Following examples are utilized this principle concentration with dyestuff in the solution before and after the degraded of ultraviolet-visible pectrophotometer mensuration in certain concentration range.
Calculate the dyestuff clearance according to following formula:
y＝((C
o-C
e)/C
o)×100％
Y represents clearance C in the formula
oAnd C
eRepresent the concentration of the final dyestuff of initial sum respectively.
Embodiment one
Choosing rhodamine b in the present embodiment is research object, dye wastewater.
The rhodamine b solution 50mL of preparation 5mg/L; Get Pt nano wire 0.5-0.8mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out spinning behind the 2min, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff reaches 94.6%, and solution becomes achromaticity and clarification liquid at last.
Embodiment two
Choosing rhodamine b in the present embodiment is research object, dye wastewater.
The rhodamine b solution 50mL of preparation 10mg/L; Get Pt nano wire 2.5-3.0mg; Be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine, respectively in the sampling of reaction different time sections; Sample takes out the back spinning, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.Calculate the clearance (percent of decolourization) of dyestuff.Along with the reaction times increases, liquid color shoals gradually, becomes achromaticity and clarification liquid at last.
Experimental result is following:
| Reaction times (minute) | 0 | 20 | 40 | 60 | 80 |
| Dye decolored clearance (%) | 0 | 86.1 | 91.8 | 96.7 | 99.8 |
Reaction after finishing is left standstill beaker, and the Pt nano wire sinks to beaker bottom, pours out the upper strata stillness of night, and the Pt line is washed the centrifugal recycling in back with clear water.Continue in beaker, to add the rhodamine b solution of 10mg/L, dye solution becomes colorless after several minutes, and the clearance of dyestuff (percent of decolourization) reaches more than 95%.After the such repeated use of Pt nano wire 4 times, dye solution still appears colourless at last, and the dyestuff clearance also reaches more than 90%.
Embodiment three
Choosing rhodamine b in the present embodiment is research object, dye wastewater.
The rhodamine b solution 50mL of preparation 50mg/L; Get Pt nano wire 2.5-3.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 8h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 89.8%.
Embodiment four
Choosing the pink B of slightly acidic in the present embodiment is research object, dye wastewater.
The pink B solution of the slightly acidic 50mL of preparation 20mg/L; Get Pt nano wire 2.5-3.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 1h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 82.1%.
Embodiment five
Choosing DISPERSE NAVY BLUE EXSF 300& BLUE 56 100 HGL in the present embodiment is research object, dye wastewater.
The DISPERSE NAVY BLUE EXSF 300& BLUE 56 100 HGL solution 50mL of preparation 25mg/L; Get Pt nano wire 4.0-4.5mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 5h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 71.1%.
Embodiment six
Choosing DISPERSE BLUE 2BLN in the present embodiment is research object, dye wastewater.
The DISPERSE BLUE 2BLN solution 50mL of preparation 20mg/L; Get Pt nano wire 3.5-4.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 2h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 61.0%.
Embodiment seven
Choosing acid peach GS in the present embodiment is research object, dye wastewater.
The acid peach GS solution 50mL of preparation 25mg/L; Get Pt nano wire 3.5-4.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 3h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 80.1%.
Embodiment eight
Choosing indigo K-3R in the present embodiment is research object, dye wastewater.
The indigo K-3R solution 50mL of preparation 25mg/L; Get Pt nano wire 3.5-4.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 1h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 41.8%.
Embodiment nine
Choosing acid gorgeous 10B in the present embodiment is research object, dye wastewater.
The acid bright red 10B solution 50mL of preparation 25mg/L; Get Pt nano wire 2.5-3.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 8h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 94.2%.
Embodiment ten
Choosing dyestuff D1 in the present embodiment is research object, dye wastewater.
The dyestuff D1 solution 50mL of preparation 25mg/L; Get Pt nano wire 2.0-2.5mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 1h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 71.3%.
Embodiment 11
Choosing the emerald green blue GL of the direct sun-proof of dyestuff in the present embodiment is research object, dye wastewater.
The emerald green blue GL solution 50mL of the direct sun-proof of preparation 25mg/L; Get Pt nano wire 2.0-2.5mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 2h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 67.9%.
Embodiment 12
Choosing dyestuff dispersion lucifer yellow 8GFF in the present embodiment is research object, dye wastewater.
The dispersion lucifer yellow 8GFF solution 50mL of preparation 25mg/L; Get Pt nano wire 2.0-2.5mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 2h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 68.8%.
Embodiment 13
A kind of water-soluble purple of choosing in the present embodiment is used as research object, dye wastewater.This structure of matter is following:
This dye solution 50mL of preparation 50mg/L; Get Pt nano wire 2.5-3.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; 1.5h back sample takes out the back spinning, supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 93.3%.
Embodiment 14
Choosing material that a kind of water-soluble bluish voilet can be used as dyestuff (referring to J.Med.Chem., 2010,53 (1), pp 368-373) in the present embodiment is research object, dye wastewater, and this structure of matter is following:
This dye solution 50mL of preparation 60mg/L; Get Pt nano wire 4.5-5mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 1h, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 90.9%.
Embodiment 15
Choosing a kind of water-soluble yellow nitroso compound in the present embodiment is research object, dye wastewater, and this material is midbody of multiple dyestuff synthetic, this structure of matter is following:
This dye solution 50mL of preparation 10mg/L; Get Pt nano wire 1.5-2.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 30min, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 82.8%.
Embodiment 16
Choosing a kind of water-soluble dark brown nitroso compound in the present embodiment is research object, dye wastewater, and this material is midbody of multiple dyestuff synthetic, this structure of matter is following:
This dye solution 50mL of preparation 10mg/L; Get Pt nano wire 0.5-1.0mg, be placed on the magnetic stirring apparatus and stir, in air, be exposed under the sunshine; Sample takes out the back spinning behind the 30min, and supernatant is measured the concentration of excess dye with ultraviolet-visible pectrophotometer.The clearance (percent of decolourization) that calculates dyestuff is 84.4%.
Claims (5)
1. the method for a photocatalytic oxidation degradation waste water containing dye is characterized in that, under the natural lighting condition; Under the agitation condition; Make photocatalyst suspended dispersed in containing the waste water of dyestuff, utilize the dyestuff in the airborne Oxygen Catalytic Oxidation degrading waste water, recycle photocatalyst; Said photocatalyst is the platinum nano wire of diameter less than 3nm;
The preparation method of said platinum nano wire is: preparation Fe-Pt nano wire, then the Fe-Pt nano wire is scattered in the methanol solution, add again hydrochloric acid HCl and acetic acid HAc stir respectively under 60-70 ℃ removed outer Fe in 1-3 hour after centrifugal making.
2. method according to claim 1 is characterized in that, specifically may further comprise the steps:
(1) is photocatalyst with diameter less than the platinum nano wire of 3nm, in pending waste water containing dye, adds photocatalyst, under the natural lighting condition, under the agitation condition, make photocatalyst suspended dispersed in containing the waste water of dyestuff, catalytic oxidation 2～480 minutes;
(2) stop to stir, the platinum nano wire sinks under water, and discharges the upper strata and handles waste water, reclaims photocatalyst, and water flushing 2-3 can reuse after clean.
3. method according to claim 1 is characterized in that, every 1L waste water need add photocatalyst 10-100mg.
4. method according to claim 1; It is characterized in that the dyestuff in the said waste water that contains dyestuff comprises: rhodamine b, the pink B of slightly acidic, DISPERSE NAVY BLUE EXSF 300& BLUE 56 100 HGL, DISPERSE BLUE 2BLN, acid peach GS, reactive brilliant bule K-3R, acid bright red 10B, dyestuff D 1, the emerald green blue GL of sun-proof, lucifer yellow 8GFF, the water-soluble yellow dyes of the water-soluble bluish voilet dyestuff of water-soluble purple
or water-soluble dark brown dyestuff
5. method according to claim 1 is characterized in that, the concentration of dyestuff is 5-60mg/L in the waste water.
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| CN105417620B (en) * | 2015-12-18 | 2018-09-25 | 南京大学 | A method of utilizing sunlight degradation of dye waste water |
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| JP4577682B2 (en) * | 2004-08-20 | 2010-11-10 | テイカ株式会社 | Photocatalyst carrying platinum compound and method for producing the same |
| CN101318749B (en) * | 2007-06-08 | 2011-07-20 | 中国科学院大连化学物理研究所 | Photocatalysis oxidation method for treating waste water of anthraquinone dye |
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Address after: 276800 shenganton Food Industrial Park, antonwei street, Lanshan, Rizhao City, Shandong Province Patentee after: Industry university research community (Shandong) scientific and technological achievements transformation Co., Ltd Address before: 276800 quanzimiao community, antonwei street, Lanshan, Rizhao City, Shandong Province (100m west of the second courtyard) Patentee before: Industry university research community (Shandong) scientific and technological achievements transformation Co., Ltd |