CN104353500A - Immobilizing method of photocatalyst and continuous treatment method for printing and dyeing wastewater - Google Patents
Immobilizing method of photocatalyst and continuous treatment method for printing and dyeing wastewater Download PDFInfo
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- CN104353500A CN104353500A CN201410614450.XA CN201410614450A CN104353500A CN 104353500 A CN104353500 A CN 104353500A CN 201410614450 A CN201410614450 A CN 201410614450A CN 104353500 A CN104353500 A CN 104353500A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 discloses an immobilizing method of a photocatalyst and a continuous treatment method for printing and dyeing wastewater. The continuous treatment method comprises the following steps: adding the powdered photocatalyst to an emulsion prepared by dissolving a polyurethane prepolymer to deionized water, stirring at high velocity to mixing the substances uniformly to form a stable suspension, adding a cross-linking agent and an initiator to the suspension to form hydrogel, cutting the hydrogel into regular particles, namely obtaining the immobilized photocatalyst, filling the immobilized photocatalyst inside a cylindrical reactor, placing the reactor under sunlight or an artificial light source, turning on a printing and dyeing wastewater pump, and continuously degrading organic pollutants in the printing and dyeing wastewater under the photocatalysis. The method has the advantages that the loading capacity of the photocatalyst is high, the immobilized position is convenient and simple to operate, the operating cost is low, the CODcr (Chemical Oxygen Demand) removal rate of dyes and the printing and dyeing wastewater under sunlight can be up to 50-95%, and the continuous treatment method can be popularized well in the treatment of other industrial wastewater.
Description
Technical field
The present invention relates to the photochemical catalyst in a kind of depollution of environment field and preparation method thereof, specifically a kind of method of immobilization photochemical catalyst and continuous catalysis oxidation processes dyeing waste water thereof.
Background technology
China is in the stage of dyeing fast development, and along with the continuous expansion of printing and dyeing production capacity, series of environmental problems also produces thereupon, and one of them is exactly the generation of a large amount of dyeing waste water.Owing to all needing a large amount of water for conveying, washing, dispersed material and cooling device etc. in the whole process of dyeing and finishing, the wastewater flow rate therefore produced is very large, generally can reach 70% ~ 90% of printing and dyeing enterprise water consumption.According to statistics, within 2010, in each industrial trade in the whole nation, textile printing and dyeing industry wastewater discharge is 12.75 tons, occupies the 5th of national discharged volume of industrial waste water, accounts for 6% of national discharged volume of industrial waste water.According to interrelated data display, in Taihu Lake basin industrial wastewater COD (CODcr) discharge capacity, about 30% derives from textile printing and dyeing industry.The pollution problem of dyeing waste water has become the social concern of extensive concern.Dyeing waste water has the features such as the water yield is large, colourity dark, complicated component, biological degradability are poor, desolventing technology difficulty, and in dyeing waste water, the deep treatment method of persistent organic pollutants is current study hotspot.Conventional deep treatment method comprises: absorption method, biologic treating technique and advanced chemical oxidation.Photocatalytic oxidation degradation speed wherein in advanced chemical oxidation is fast, does not produce secondary pollution, and reaction condition is gentle, is the research direction that environmental area enlivens.Titanium dioxide is efficient, stable chemical nature, anti-photooxidation type are strong, is widely used in photochemical catalytic oxidation.The energy gap of titanium dioxide (Detitanium-ore-type) is 3.2eV, and absorbing wavelength is less than 388nm, and absorption bands is ultraviolet region.And with rare earth element, nonmetalloid, precious metal element etc., modification is carried out to titanium dioxide and can improve its photocatalytic activity, improve its visible light-responded scope, reduce the energy ezpenditure in persistent organic pollutants process in waste water, even realize pollutant and directly under sunshine, carry out photocatalytic degradation.Researcher goes out different photocatalytic degradation method according to the characteristics design of photocatalytic degradation, mainly be divided into floating type and support type two kinds, wherein support type photocatalytic degradation is more conducive to recovery and the recycling of catalyst, but it is low to there is load capacity in present load process, catalytic Contact area is little, reduce the catalytic activity of titanium dioxide optical catalyst, cause the problem that degradation efficiency declines, and mostly support type photocatalytic method is the mode process waste water adopting batch processed, can not realize the continuous process of waste water.
Summary of the invention
One of the object of the invention is the above-mentioned deficiency for prior art, provides a kind of method of fixing means of photochemical catalyst and continuous treatment of dyeing and printing.
The fixing means of photochemical catalyst and a method for continuous treatment of dyeing and printing, is characterized in that, comprise the following steps:
(1) powder photocatalyst is added in the emulsion formed after base polyurethane prepolymer for use as is dissolved in deionized water, high-speed stirred makes it mix and forms stable suspension, add crosslinking agent and initator again, the polyurethane hydrogel of immobilization photochemical catalyst is formed through emulsion free-radical polymerization, this hydrogel is cut into regular particle, namely photocatalysis agent is fixed
(2) the immobilization photochemical catalyst obtained is filled in cylindricality inside reactor, under reactor being positioned over sunlight or artificial light sources, opens dyeing waste water water pump, by the organic pollution in photocatalysis continuous degradation dyeing waste water.
In described immobilization photochemical catalyst, the mass percent of powder photocatalyst is 5 ~ 30%, the mass percent of base polyurethane prepolymer for use as is 10 ~ 40%, the mass percent of crosslinking agent is 5 ~ 10%, and the mass percent of initator is 0.1 ~ 1.0%, and the mass percent of deionized water is 19 ~ 79.9%.
Described photochemical catalyst is the powder body material with photocatalysis effect of titanium dioxide or zinc oxide and various modification or doping, and powder average grain diameter is less than 100 microns.
Described base polyurethane prepolymer for use as is the macromolecule that two ends have following structure:
Wherein PU represents polyurethane skeleton, and the molecular weight of base polyurethane prepolymer for use as is 2000 ~ 20000.
Described crosslinking agent is N, N '-methylene acrylic acid amides, polyethyleneglycol diacrylate, one in polyethylene glycol dimethacrylate or its combination.
Described initator is N, N, N ', the one in N '-tetramethylethylenediamine, sulphite, bisulfites or its combination.
The present invention utilizes the method for immobilization photochemical catalyst continuous catalysis oxidation processes dyeing waste water, this photochemical catalyst has features such as improving photocatalyst amount, photon utilization rate, degradation speed is fast, purification efficiency is high, cost is low, preparation technology is simple, and loose powder shape or granular catalyst are more adapted to photocatalytic oxidation reactor unit operations relatively.
It is in the cylindrical quartz glass reactor of 100mm that monoblock type photochemical catalyst for dyeing waste water provided by the invention is filled in diameter, dyeing waste water is passed into continuously with the flow velocity of 20 ~ 100 mL/min, ensure certain intensity of illumination, keep dyeing waste water hydraulic detention time in a reservoir 30 ~ 120 minutes, after stable reaction, measure the CODcr importing and exporting dyeing waste water, CODcr clearance can reach 50 ~ 95%.
Detailed description of the invention
Below embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1:
By 10g molecular weight be 4000 base polyurethane prepolymer for use as be dissolved in 74.5g deionized water and form emulsion, 10g nano titanium oxide P25 is added in emulsion, high-speed stirred makes it mix and forms stable suspension, add 5g polyethyleneglycol diacrylate and 0.5g N again, N, N ', N '-tetramethylethylenediamine, form the polyurethane hydrogel of bulk immobilization photochemical catalyst through emulsion free-radical polymerization, this hydrogel is cut into the cube that the length of side is 3mm, is namely fixed photocatalysis agent.
It is in the cylindrical quartz glass reactor of 100mm that the monoblock type photochemical catalyst for dyeing waste water that the present embodiment obtains is filled in diameter, dyeing waste water is passed into continuously with the flow velocity of 20 mL/min, keep dyeing waste water hydraulic detention time in a reservoir in the sunlight 60 minutes, after stable reaction, measure the CODcr importing and exporting dyeing waste water, CODcr clearance can reach 65%.
Embodiment 2:
By 20g molecular weight be 3000 base polyurethane prepolymer for use as be dissolved in 52g deionized water and form emulsion, 20g nano titanium oxide P25 is added in emulsion, high-speed stirred makes it mix and forms stable suspension, add 7.5g polyethyleneglycol diacrylate and 0.5g N again, N, N ', N '-tetramethylethylenediamine, form the polyurethane hydrogel of bulk immobilization photochemical catalyst through emulsion free-radical polymerization, this hydrogel is cut into the cube that the length of side is 5mm, is namely fixed photocatalysis agent.
It is in the cylindrical quartz glass reactor of 100mm that the monoblock type photochemical catalyst for dyeing waste water that the present embodiment obtains is filled in diameter, dyeing waste water is passed into continuously with the flow velocity of 20 mL/min, keep dyeing waste water hydraulic detention time in a reservoir in the sunlight 60 minutes, after stable reaction, measure the CODcr importing and exporting dyeing waste water, CODcr clearance can reach 72.5%.
Embodiment 3:
By 15g molecular weight be 5000 base polyurethane prepolymer for use as be dissolved in 52g deionized water and form emulsion, 25g nano titanium oxide P25 is added in emulsion, high-speed stirred makes it mix and forms stable suspension, add 7.5gN again, N '-methylene acrylic acid amides and 0.5g sodium sulfite, form the polyurethane hydrogel of bulk immobilization photochemical catalyst through emulsion free-radical polymerization, this hydrogel is cut into the cube that the length of side is 4mm, is namely fixed photocatalysis agent.
It is in the cylindrical quartz glass reactor of 100mm that the monoblock type photochemical catalyst for dyeing waste water that the present embodiment obtains is filled in diameter, dyeing waste water is passed into continuously with the flow velocity of 40 mL/min, keep dyeing waste water hydraulic detention time in a reservoir in the sunlight 30 minutes, after stable reaction, measure the CODcr importing and exporting dyeing waste water, CODcr clearance can reach 66.5%.
Embodiment 4:
By 10g molecular weight be 10000 base polyurethane prepolymer for use as be dissolved in 69.5g deionized water and form emulsion, 15g nano titanium oxide P25 is added in emulsion, high-speed stirred makes it mix and forms stable suspension, add 5g polyethylene glycol dimethacrylate and 0.5g sodium sulfite again, the polyurethane hydrogel of bulk immobilization photochemical catalyst is formed through emulsion free-radical polymerization, this hydrogel is cut into the cube that the length of side is 4mm, is namely fixed photocatalysis agent.
It is in the cylindrical quartz glass reactor of 100mm that the monoblock type photochemical catalyst for dyeing waste water that the present embodiment obtains is filled in diameter, dyeing waste water is passed into continuously with the flow velocity of 10 mL/min, keep dyeing waste water hydraulic detention time in a reservoir in the sunlight 120 minutes, after stable reaction, measure the CODcr importing and exporting dyeing waste water, CODcr clearance can reach 83.6%.
Embodiment 5:
By 20g molecular weight be 10000 base polyurethane prepolymer for use as be dissolved in 46.5g deionized water and form emulsion, 25g nano titanium oxide P25 is added in emulsion, high-speed stirred makes it mix and forms stable suspension, add 7.5g polyethylene glycol dimethacrylate and 1g sodium hydrogensulfite again, the polyurethane hydrogel of bulk immobilization photochemical catalyst is formed through emulsion free-radical polymerization, this hydrogel is cut into the cube that the length of side is 2mm, is namely fixed photocatalysis agent.
It is in the cylindrical quartz glass reactor of 100mm that the monoblock type photochemical catalyst for dyeing waste water that the present embodiment obtains is filled in diameter, dyeing waste water is passed into continuously with the flow velocity of 10 mL/min, keep dyeing waste water hydraulic detention time in a reservoir in the sunlight 120 minutes, after stable reaction, measure the CODcr importing and exporting dyeing waste water, CODcr clearance can reach 92.6%.
Embodiment 6:
By 25g molecular weight be 5000 base polyurethane prepolymer for use as be dissolved in 36.5g deionized water and form emulsion, 30g nano titanium oxide P25 is added in emulsion, high-speed stirred makes it mix and forms stable suspension, add 7.5g polyethylene glycol dimethacrylate and 1g sodium sulfite again, the polyurethane hydrogel of bulk immobilization photochemical catalyst is formed through emulsion free-radical polymerization, this hydrogel is cut into the cube that the length of side is 2mm, is namely fixed photocatalysis agent.
It is in the cylindrical quartz glass reactor of 100mm that the monoblock type photochemical catalyst for dyeing waste water that the present embodiment obtains is filled in diameter, dyeing waste water is passed into continuously with the flow velocity of 10 mL/min, keep dyeing waste water hydraulic detention time in a reservoir in the sunlight 120 minutes, after stable reaction, measure the CODcr importing and exporting dyeing waste water, CODcr clearance can reach 92.4%.
Claims (6)
1. the fixing means of photochemical catalyst and a method for continuous treatment of dyeing and printing, is characterized in that, comprise the following steps:
(1) powder photocatalyst is added in the emulsion formed after base polyurethane prepolymer for use as is dissolved in deionized water, high-speed stirred makes it mix and forms stable suspension, add crosslinking agent and initator again, the polyurethane hydrogel of immobilization photochemical catalyst is formed through emulsion free-radical polymerization, this hydrogel is cut into regular particle, namely photocatalysis agent is fixed
(2) the immobilization photochemical catalyst obtained is filled in cylindricality inside reactor, under reactor being positioned over sunlight or artificial light sources, opens dyeing waste water water pump, by the organic pollution in photocatalysis continuous degradation dyeing waste water.
2. the fixing means of a kind of photochemical catalyst according to claim 1 and the method for continuous treatment of dyeing and printing, it is characterized in that, in described immobilization photochemical catalyst, the mass percent of powder photocatalyst is 5 ~ 30%, the mass percent of base polyurethane prepolymer for use as is 10 ~ 40%, the mass percent of crosslinking agent is 5 ~ 10%, the mass percent of initator is 0.1 ~ 1.0%, and the mass percent of deionized water is 19 ~ 79.9%.
3. the fixing means of a kind of photochemical catalyst according to claim 1 and the method for continuous treatment of dyeing and printing, it is characterized in that, described photochemical catalyst is the powder body material with photocatalysis effect of titanium dioxide or zinc oxide and various modification or doping, and powder average grain diameter is less than 100 microns.
4. the fixing means of a kind of photochemical catalyst according to claim 1 and the method for continuous treatment of dyeing and printing, it is characterized in that, described base polyurethane prepolymer for use as is the macromolecule that two ends have following structure:
Wherein PU represents polyurethane skeleton, and the molecular weight of base polyurethane prepolymer for use as is 2000 ~ 20000.
5. the fixing means of a kind of photochemical catalyst according to claim 1 and the method for continuous treatment of dyeing and printing, it is characterized in that, described crosslinking agent is N, N '-methylene acrylic acid amides, polyethyleneglycol diacrylate, one in polyethylene glycol dimethacrylate or its combination.
6. the fixing means of a kind of photochemical catalyst according to claim 1 and the method for continuous treatment of dyeing and printing, it is characterized in that, described initator is N, N, N ', the one in N '-tetramethylethylenediamine, sulphite, bisulfites or its combination.
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| CN201410614450.XA CN104353500B (en) | 2014-11-05 | 2014-11-05 | The fixing means of a kind of photocatalyst and the continuous method processing dyeing waste water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106492882A (en) * | 2016-10-20 | 2017-03-15 | 南京大学 | Tool amide groups and the preparation method and application of load photocatalyst of Nano cadmium sulphide composite aquogel |
| CN109293093A (en) * | 2018-10-17 | 2019-02-01 | 东莞绿邦智能科技有限公司 | A kind of processing unit containing organic pollutant wastewater |
| CN115069301A (en) * | 2022-05-27 | 2022-09-20 | 恒天嘉华非织造有限公司 | Composite material for printing and dyeing textile wastewater treatment and preparation method thereof |
| CN115108861A (en) * | 2022-05-06 | 2022-09-27 | 广州大丘有机农产有限公司 | Fermentation treatment process of traditional Chinese medicine residues |
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| CN101234793A (en) * | 2007-05-22 | 2008-08-06 | 何梅 | Highly effective self-response titanium catalyst and preparing method thereof |
| CN103937022A (en) * | 2014-05-06 | 2014-07-23 | 盛宇星 | Nanometer supported potocatalyst as well as preparation method and application of nanometer supported potocatalyst |
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Patent Citations (2)
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| CN101234793A (en) * | 2007-05-22 | 2008-08-06 | 何梅 | Highly effective self-response titanium catalyst and preparing method thereof |
| CN103937022A (en) * | 2014-05-06 | 2014-07-23 | 盛宇星 | Nanometer supported potocatalyst as well as preparation method and application of nanometer supported potocatalyst |
Non-Patent Citations (2)
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| PEI LIU ET AL.: "Preparation of TiO2 nanotubes coated on polyurethane and study of their photocatalytic activity", 《APPLIED SURFACE SCIENCE》, vol. 258, 6 June 2012 (2012-06-06) * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106492882A (en) * | 2016-10-20 | 2017-03-15 | 南京大学 | Tool amide groups and the preparation method and application of load photocatalyst of Nano cadmium sulphide composite aquogel |
| CN106492882B (en) * | 2016-10-20 | 2019-04-05 | 南京大学 | Have amide groups and loads the preparation method and application of photocatalyst of Nano cadmium sulphide composite hydrogel |
| CN109293093A (en) * | 2018-10-17 | 2019-02-01 | 东莞绿邦智能科技有限公司 | A kind of processing unit containing organic pollutant wastewater |
| CN115108861A (en) * | 2022-05-06 | 2022-09-27 | 广州大丘有机农产有限公司 | Fermentation treatment process of traditional Chinese medicine residues |
| CN115108861B (en) * | 2022-05-06 | 2023-04-07 | 广州大丘有机农产有限公司 | Fermentation treatment process of traditional Chinese medicine residues |
| CN115069301A (en) * | 2022-05-27 | 2022-09-20 | 恒天嘉华非织造有限公司 | Composite material for printing and dyeing textile wastewater treatment and preparation method thereof |
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