CN109879351B - Functional powder capable of being recycled, rapidly and efficiently purifying printing and dyeing wastewater, preparation method and decoloring method thereof - Google Patents
Functional powder capable of being recycled, rapidly and efficiently purifying printing and dyeing wastewater, preparation method and decoloring method thereof Download PDFInfo
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Abstract
The invention relates to a reusable, rapid and efficient functional powder for purifying printing and dyeing wastewater, a preparation method and a decoloring method thereof. The preparation method of the functional powder comprises the following steps: (1) uniformly mixing a titanate compound or a titanium salt compound with a proper amount of an alcohol solvent 1, and then adding the alcohol solvent to adjust the pH value of the mixed solution to 1-5 to obtain a solution A; (2) taking a proper amount of alcohol solvent 2, uniformly mixing with deionized water to obtain solution B, and then adding cellulose powder into solution B and uniformly mixing to obtain solution C; (3) and slowly adding the solution A into the solution C, uniformly stirring, heating to 40-80 ℃, reacting at a constant temperature for 4-8 hours, filtering the product, and drying. The prepared functional powder is added into reactive dye wastewater with proper concentration for 1-2 min, so that the wastewater can be rapidly purified, and the liquid becomes clear. In addition, the functional powder which absorbs the dye is dispersed in a proper amount of water and then is placed under an ultraviolet lamp or natural light for irradiation, so that the powder can be completely decolorized, and the reutilization of the powder is realized.
Description
Technical Field
The invention relates to the field of preparation of composite materials and environmental pollution treatment, in particular to a reusable, rapid and efficient functional powder for purifying printing and dyeing wastewater, a preparation method and a decoloring method thereof.
Background
The consumption of textile fibers in the world is increasing at a rate of 2% per year, and according to incomplete statistics, about 11 million tons of wastewater are discharged per year in the domestic printing and dyeing industry. When the fiber dye is dyed, because of the limitation of the dyeing mechanism of the dye, dyeing wastewater contains more dye molecules which are not absorbed completely, and if the wastewater is directly discharged without treatment, the colored wastewater can cause great damage to the environment. Currently, the decolorization of dye wastewater is a very delicate problem, and the environmental pollution caused by the problem is gradually paid attention to by people, and the decolorization treatment of dye wastewater has become one of the hot topics studied by researchers.
At present, the treatment method of the printing and dyeing wastewater comprises an activated carbon adsorption method, a photooxidation method, a Fenton oxidation method, a wet catalytic oxidation method and the like. The adsorption method is mainly used for advanced treatment after pretreatment or biochemistry, common adsorbents comprise activated carbon, alumina, natural clay, silica gel, hydroxide, sludge, microorganisms and the like, and the activated carbon adsorption is the most widely applied organic and color wastewater treatment method at present, but the activated carbon adsorption time is long and the regeneration is difficult. The chemical methods are mainly classified into a coagulation precipitation method, an oxidation method, and an electrochemical method. The oxidation method is classified into a chemical oxidation method and an advanced oxidation method, and is a treatment process for oxidizing and destroying a chromophoric gene of a dye to decolorize the dye. The advanced oxidation technology comprises a wet oxidation method, a Fenton reagent method, a photocatalytic oxidation method and the like, has good decolorization capacity, but has high cost and poor COD reduction effect. The electrochemical technology has multiple functions of oxidation reduction, condensation, sterilization, disinfection, adsorption and the like in wastewater treatment, but can completely oxidize and decompose organic pollutants in water, so that the energy consumption is high, and the equipment cost is also high. Therefore, the treatment method has the defects of poor effect, low original concentration of the treated wastewater, inadaptability to high salt content and high chroma, long treatment time, high treatment cost and the like.
For the above reasons, the present application has been made.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the functional powder capable of being reused, quickly and efficiently purifying the printing and dyeing wastewater, and the preparation method and the decoloring method thereof. The functional powder prepared by the method can quickly purify and decolor the conventional dyeing wastewater within 1-2 min, so that the wastewater becomes clear.
In order to achieve the above object, the present invention adopts the following technical solutions:
a preparation method of functional powder capable of being recycled, quickly and efficiently purifying printing and dyeing wastewater comprises the following steps:
(1) preparing a solution A: uniformly mixing a titanate compound or a titanium salt compound with a proper amount of an alcohol solvent 1, and then adding an inorganic acid to adjust the pH value of the mixed solution to 1-5 to obtain a solution A; wherein: the volume ratio of the titanate compound or the titanium salt compound to the alcohol solvent 1 is 1: 6-1: 15;
(2) preparing a solution C: taking a proper amount of alcohol solvent 2, uniformly mixing with deionized water to obtain solution B, then adding a proper amount of cellulose powder into solution B, and uniformly mixing to obtain solution C; wherein: the volume ratio of the alcohol solvent 2 to the deionized water is 1: 8-1: 15;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 40-80 ℃, reacting at a constant temperature for 4-8 hours, and filtering and drying a product after the reaction is finished to obtain the functional powder.
Further, in the above technical solution, the titanate compound in step (1) may be any one of n-butyl titanate, isobutyl titanate, or tetraisopropyl titanate.
Further, in the above technical solution, the titanium salt compound in the step (1) may be any one of titanium tetrachloride, titanium sulfate, titanyl sulfate, or the like.
Further, in the above technical scheme, the alcohol solvent 1 in the step (1) and the alcohol solvent 2 in the step (2) may be the same, and are the same solvent; or may be different, being two different solvents; the alcohol solvent 1 and the alcohol solvent 2 can be any one of absolute ethyl alcohol, isopropanol and the like.
Further, in the above technical solution, the inorganic acid in the step (1) is any one of hydrochloric acid, nitric acid, and sulfuric acid.
Further, in the technical scheme, the mass ratio of the cellulose powder in the step (2) to the solution B is 1 g: 90 ml-1 g: 160 ml.
The second purpose of the invention is to provide the functional powder which can be recycled, can purify printing and dyeing wastewater quickly and efficiently and is prepared by the method.
The third purpose of the invention is to provide a method for decoloring the reactive dye wastewater by using the functional powder.
The functional powder prepared by the invention is applied to the decoloring method of reactive dye wastewater, and the operation method comprises the following steps:
0.5-2 g of the prepared functional powder is added into 1000mL of reactive dye wastewater for 1-2 min, so that the dye wastewater can be completely decolorized.
Further, according to the technical scheme, the mass percent of the reactive dye in the dye wastewater is 0.001-0.01%.
Further, in the above technical means, the type of the reactive dye is not limited, and any reactive dye may be used as long as it contains a reactive group capable of reacting with a hydroxyl group in cellulose and an amino group in protein fiber in a molecule, and generates a covalent bond with the fiber during dyeing to generate a "dye-fiber" compound.
The fourth object of the present invention is to provide a method for recycling the functional powder having adsorbed the dye, the method specifically comprises:
taking out the functional powder with the adsorbed dye, preparing a suspension with a solid content of 70-75% by using deionized water, continuously irradiating the suspension for 10-30 min under an ultraviolet lamp or continuously irradiating for 10-15 d under natural light until dye molecules adsorbed on the surface of the powder are completely decomposed by self to obtain decolorized powder, and adding the decolorized powder into the reactive dye wastewater again for decolorization.
Further, according to the technical scheme, the power of the ultraviolet lamp is 300-1000W, preferably 500W.
Further, in the above technical solution, the ultraviolet irradiation time is preferably 20 min.
The decolorization mechanism of the functional powder with adsorbed dye under the condition of ultraviolet light or natural light is as follows:
because ultraviolet light has high energy and titanium dioxide has a higher band gap (3.2eV), when the ultraviolet light irradiates the titanium dioxide, the ultraviolet light enables the titanium dioxide to generate electron-hole pairs, and cellulose has the same component as cotton, so that the cellulose has high adsorbability on reactive dyes, and the titanium dioxide loaded on the surface of the cellulose can release photoexcited electron-hole pairs more easily and can generate photocatalytic degradation reaction (gain or lose electrons) with reactive dye molecules on the cellulose more quickly. And the decoloration can be realized under the natural illumination condition because the natural light also contains ultraviolet light. Therefore, the functional powder prepared by the method not only can quickly realize the decolorization of the dye wastewater, but also can easily perform photocatalytic degradation reaction with dye molecules to recover the primary color of the functional powder, thereby realizing the reutilization of the powder.
Compared with the prior art, the invention has the following beneficial effects:
aiming at the problems in the prior dyeing wastewater treatment, the invention develops functional powder which has the function of purifying wastewater generated by the reactive dye color finishing. The powder can be used for quickly purifying colored liquid with a certain concentration (equivalent to that of conventional dyeing wastewater) within 1-2 min, so that the liquid becomes clear, and the speed is far higher than that of adsorbents such as activated carbon and the like adopted in the current market. Most importantly, the dye-adsorbed functional powder can be recovered to the original color within 10-30 min by a photochemical treatment method and recycled. Even without photochemical treatment, the powder can automatically decompose dye molecules adsorbed on the powder within 10-15 days under the irradiation of natural light, the color of the functional powder gradually becomes lighter and finally becomes white, and the effect is beyond the reach of a dye wastewater treatment agent in the prior art, so that the functional powder prepared by the invention has wide application prospect in the aspect of treating dye wastewater.
Drawings
FIG. 1 is a transmission electron microscope image of a functional powder prepared in example 1 of the present invention;
FIG. 2 is a photograph showing the appearance of the functional powder obtained in example 1 of the present invention;
FIG. 3 (a) and (b) are graphs comparing the effect of the functional powder prepared in example 1 before and after being applied to the decolorization of dye wastewater; (c) and (d) is a decoloration effect graph after being placed for 7 days and 15 days under natural light conditions.
FIG. 4 is a photograph showing the appearance of a decolorized powder obtained by decolorizing and drying the powder in application example 1 of the present invention;
FIG. 5 is a graph showing the wavelength-absorbance change with time of the functional powder adsorbing dye according to application example 1 of the present invention;
FIG. 6 is a photograph showing the appearance of functional powder after being reused for 4 times in example 4 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following examples and the accompanying drawings. The present invention is implemented on the premise of the technology of the present invention, and the detailed embodiments and specific procedures are given to illustrate the inventive aspects of the present invention, but the scope of the present invention is not limited to the following embodiments.
Various modifications to the precise description of the invention will be readily apparent to those skilled in the art from the information contained in this application without departing from the spirit and scope of the appended claims. It is to be understood that the scope of the invention is not limited to the procedures, properties, or components defined, as these embodiments, as well as others described, are intended to be merely illustrative of particular aspects of the invention. Indeed, various modifications of the embodiments of the invention which are obvious to those skilled in the art or related fields are intended to be covered by the scope of the appended claims.
For a better understanding of the invention, and not as a limitation on the scope thereof, all numbers expressing quantities, percentages, and other numerical values used in this application are to be understood as being modified in all instances by the term "about". Accordingly, unless expressly indicated otherwise, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At the very least, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Example 1
The preparation method of the functional powder capable of repeatedly utilizing, rapidly and efficiently purifying the printing and dyeing wastewater comprises the following steps:
(1) preparing a solution A: adding 10mL of n-butyl titanate into 60mL of absolute ethanol, uniformly mixing, and then adding hydrochloric acid to adjust the pH value of the mixed solution to 2 to obtain solution A;
(2) preparing a solution C: measuring 10mL of absolute ethyl alcohol, adding the absolute ethyl alcohol into 80mL of deionized water, and uniformly mixing to obtain the product
Adding a proper amount of 1g of cellulose powder into the solution B, and uniformly mixing to obtain a solution C;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 40 ℃, reacting at a constant temperature for 8 hours, and filtering and drying a product after the reaction is finished to obtain the functional powder.
Example 2
The preparation method of the functional powder capable of repeatedly utilizing, rapidly and efficiently purifying the printing and dyeing wastewater comprises the following steps:
(1) preparing a solution A: adding 10mL of tetraisopropyl titanate into 100mL of absolute ethyl alcohol, uniformly mixing, and then adding hydrochloric acid to adjust the pH value of the mixed solution to 4 to obtain the solution A;
(2) preparing a solution C: measuring 10mL of absolute ethyl alcohol, adding the absolute ethyl alcohol into 100mL of deionized water, and uniformly mixing to obtain the product
Adding a proper amount of 1g of cellulose powder into the solution B, and uniformly mixing to obtain solution C;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 60 ℃, reacting at a constant temperature for 6 hours, and filtering and drying a product after the reaction is finished to obtain the functional powder.
Example 3
The preparation method of the functional powder capable of repeatedly utilizing, quickly and efficiently purifying printing and dyeing wastewater comprises the following steps:
(1) preparing a solution A: adding 10mL of titanium tetrachloride into 80mL of isopropanol, uniformly mixing, and then adding hydrochloric acid to adjust the pH value of the mixed solution to 5 to obtain solution A;
(2) preparing a solution C: measuring 10mL of isopropanol, adding the isopropanol into 120mL of deionized water, uniformly mixing to obtain a solution B, adding a proper amount of 1g of cellulose powder into the solution B, and uniformly mixing to obtain a solution C;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 50 ℃, reacting at a constant temperature for 8 hours, and filtering and drying a product after the reaction is finished to obtain the functional powder.
Example 4
The preparation method of the functional powder capable of repeatedly utilizing, quickly and efficiently purifying printing and dyeing wastewater comprises the following steps:
(1) preparing a solution A: adding 10mL of isobutyl titanate into 120mL of absolute ethyl alcohol, uniformly mixing, and then adding nitric acid to adjust the pH value of the mixed solution to 3 to obtain solution A;
(2) preparing a solution C: measuring 10mL of absolute ethyl alcohol, adding the absolute ethyl alcohol into 120mL of deionized water, and uniformly mixing to obtain the product
Adding a proper amount of 1g of cellulose powder into the solution B, and uniformly mixing to obtain solution C;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 80 ℃, reacting at a constant temperature for 4 hours, and filtering and drying a product after the reaction is finished to obtain the functional powder.
Example 5
The preparation method of the functional powder capable of repeatedly utilizing, rapidly and efficiently purifying the printing and dyeing wastewater comprises the following steps:
(1) preparing a solution A: adding 10mL of titanium sulfate into 150mL of absolute ethyl alcohol, uniformly mixing, and then adding sulfuric acid to adjust the pH value of the mixed solution to 2 to obtain the solution A;
(2) preparing a solution C: measuring 10mL of isopropanol, adding the isopropanol into 150mL of deionized water, uniformly mixing to obtain a solution B, then adding a proper amount of 1g of cellulose powder into the solution B, and uniformly mixing to obtain a solution C;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 70 ℃, reacting at a constant temperature for 6 hours, and filtering and drying a product after the reaction is finished to obtain the functional powder.
Example 6
The preparation method of the functional powder capable of repeatedly utilizing, rapidly and efficiently purifying the printing and dyeing wastewater comprises the following steps:
(1) preparing a solution A: adding 10mL of n-butyl titanate into 90mL of absolute ethyl alcohol, uniformly mixing, and then adding hydrochloric acid to adjust the pH value of the mixed solution to 3 to obtain solution A;
(2) preparing a solution C: weighing 10mL of absolute ethyl alcohol, adding the absolute ethyl alcohol into 100mL of deionized water, and uniformly mixing to obtain the product
Adding a proper amount of 1g of cellulose powder into the solution B, and uniformly mixing to obtain a solution C;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 55 ℃, reacting at a constant temperature for 6.5 hours, and filtering and drying a product after the reaction is finished to obtain the functional powder.
Application example 1
Adding a proper amount of reactive red 195 dye into deionized water, dissolving uniformly to prepare reactive red 195 dyeing wastewater (the mass percent of the reactive red 195 dye in the wastewater is 0.0035%), and testing the absorbance value of the obtained wastewater by using an ultraviolet spectrophotometer to be 2.5. Then, the functional powder prepared in the embodiment 1 is mixed according to the mass ratio of 1: 1000, adding the powder into the activated red 195 wastewater, wherein the powder is charged on the surface, the powder which is just added is suspended in liquid, the surface of the powder can be electrically neutral after the powder adsorbs the dye, after about 1-2 min, the powder which adsorbs the dye sinks to the bottom of the sedimentation tank under the action of gravity, after the powder completely sinks, taking away the clear liquid at the upper half part in the sedimentation tank, and pumping out the colored powder at the lower half part in the tank. The absorbance value of the obtained supernatant is 0 by using an ultraviolet spectrophotometer, which shows that all the dye in the dye solution is absorbed by the powder. The colored powder in the lower half part of the pool is pumped out and prepared into the powder with the mass ratio of 1: 30, placing the suspension under natural light conditions for 15 days, gradually decoloring the powder, filtering after complete decoloring, and drying to obtain the decolored powder.
FIG. 3 (a), (b) and (c) are graphs comparing the effect of the functional powder prepared in example 1 of the present invention in decoloring dye wastewater; wherein: (a) the wastewater is untreated dyeing wastewater (prepared according to the dye uptake of 85 percent); (b) the decoloration effect graph of the wastewater is obtained after the functional powder is treated for 1.5min (the red color at the bottleneck is formed by light reflection, and the solution is clear); (c) and (d) are effect diagrams of the functional powder after being placed for 7d and 15d under the natural light condition respectively. As can be seen from the figures 3 and 5, the functional powder prepared by the method can quickly purify dyeing wastewater within 1.5min, so that the liquid becomes clear; and the color of the powder adsorbed with the dye gradually becomes lighter with the time under the irradiation of ultraviolet light, and the edge of the powder layer at the bottom of the bottle (figure 3c) becomes white.
In addition, the inventor applies the functional powder prepared in the embodiments 2 to 6 to the decolorization of the reactive red 195 dye wastewater with the same concentration by the same method as the application embodiment 1, and the decolorization effect of the functional powder is basically consistent with that of the functional powder in the embodiment 1.
Application example 2
Adding a proper amount of the active yellow 145 dye into deionized water, uniformly dissolving to prepare active yellow 145 dyeing wastewater (the mass percent of the active yellow 145 dye in the wastewater is 0.005%), and testing the absorbance value of the obtained wastewater by using an ultraviolet spectrophotometer to be 3.17. Then, the functional powder prepared in the embodiment 2 is mixed according to the mass ratio of 1: 1000, adding the powder into the activated yellow 145 wastewater, after about 1-2 min, absorbing the color of the powder, precipitating the powder into the bottom of the tank, and taking away the clear water in the upper half part of the precipitation tank. And (4) extracting the colored powder at the lower half part in the pool. And (3) testing by using an ultraviolet spectrophotometer to obtain that the absorbance value of the supernatant is 0, which indicates that all the dye in the dye solution is absorbed by the powder. The colored powder in the lower half part of the pool is pumped out and prepared into the powder with the mass ratio of 1: 30, irradiating the suspension for 10min by using a 1000W ultraviolet lamp, decoloring the powder, filtering and drying to obtain decolored powder.
Application example 3
Application example 1 a recycling experiment of the decolorized functional powder was performed.
Adding a proper amount of reactive red 195 dye into deionized water, dissolving uniformly to prepare reactive red 195 dyeing wastewater (the mass percent of the reactive red 195 dye in the wastewater is 0.0035%), and testing the absorbance value of the obtained wastewater by using an ultraviolet spectrophotometer to be 2.4. Then, the decolorized powder obtained in application example 1 is mixed according to a mass ratio of 1: 1000, adding the powder into the reactive red 195 dyeing wastewater, absorbing the color of the powder after about 1-2 min, settling the powder into the bottom of the tank, and taking away the clear water in the upper half part of the settling tank. And (4) extracting the colored powder at the lower half part in the pool. And (3) testing by using an ultraviolet spectrophotometer to obtain that the absorbance value of the supernatant is 0, which indicates that the dye in the dye solution is completely absorbed by the powder again. The maximum number of repeats measured is currently 5.
In addition, the functional powder prepared in the embodiments 2 to 6 is used for repeatedly decoloring the reactive red 195 dye wastewater with the same concentration, and the decoloring effect is basically consistent with that of the functional powder in the embodiment 1.
Application example 4
Application example 2 a recycling experiment of the decolorized functional powder was performed.
1 st recycle test: adding a proper amount of active yellow 145 dye into deionized water, uniformly dissolving to prepare active yellow 145 dyeing wastewater (the mass percent of the active yellow 145 dye in the wastewater is 0.005%), and testing the absorbance value of the wastewater by using an ultraviolet spectrophotometer to be 3.16. Then, the decolorized powder obtained in application example 2 is mixed according to a mass ratio of 1: 1000, adding the powder into the activated yellow 145 wastewater, absorbing the color of the powder after about 1-2 min, settling the powder into the bottom of the tank, and taking away the clear water in the upper half part of the settling tank. And (4) extracting the colored powder at the lower half part in the pool. And (3) testing by using an ultraviolet spectrophotometer to obtain that the absorbance value of the supernatant is 0, which indicates that the dye in the dye solution is completely absorbed by the powder again. The colored powder in the lower half part of the pool is pumped out and prepared into the powder with the mass ratio of 1: irradiating the suspension 20 with 1000W ultraviolet lamp for 30min, decolorizing, filtering, and oven drying to obtain decolorized powder.
The recycling effect of the application examples 2 to 4 times is the same as the recycling effect of the first time, and the difference is only that the powder decoloring time is increased from 30min to 120 min.
In fig. 6, (a), (b), (c), and (d) are photographs of the appearance and appearance of the functional powder after being repeatedly used for 1-4 times in the application example, in sequence, wherein: (a) undried decolorized powder; (d) and (5) drying the decolorized powder.
In addition, the functional powder prepared in the embodiments 2 to 6 is used for repeatedly decoloring the reactive yellow 145 dye wastewater with the same concentration, and the decoloring effect is basically consistent with that of the functional powder in the embodiment 2.
Claims (4)
1. A method for applying functional powder to decoloration of reactive dye wastewater is characterized in that the functional powder can be reused, and can purify the reactive dye wastewater rapidly and efficiently, and the method comprises the following steps: the specific operation method comprises the following steps:
adding 0.5-2 g of the prepared functional powder into 1000mL of reactive dye wastewater for 1-2 min, so that the reactive dye wastewater can be completely decolorized;
the preparation method of the functional powder comprises the following steps:
(1) preparing a solution A: uniformly mixing a titanate compound or a titanium salt compound with a proper amount of alcohol solvent 1, and then adding an inorganic acid to adjust the pH value of the mixed solution to 1-5 to obtain a solution A; wherein: the volume ratio of the titanate compound or the titanium salt compound to the alcohol solvent 1 is 1: 6-1: 15;
(2) preparing a solution C: taking a proper amount of alcohol solvent 2, uniformly mixing with deionized water to obtain solution B, then adding a proper amount of cellulose powder into solution B, and uniformly mixing to obtain solution C; wherein: the volume ratio of the alcohol solvent 2 to the deionized water is 1: 8-1: 15;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 40-60 ℃, reacting at a constant temperature for 4-8 hours, and filtering and drying a product after the reaction is finished to obtain functional powder;
the alcohol solvent 1 and the alcohol solvent 2 are any one of absolute ethyl alcohol and isopropanol;
the inorganic acid in the step (1) is any one of hydrochloric acid, nitric acid and sulfuric acid;
the mass ratio of the cellulose powder to the liquid B in the step (2) is 1 g: 90 ml-1 g: 160 ml; the titanate compound in the step (1) is any one of n-butyl titanate, isobutyl titanate or tetraisopropyl titanate; the titanium salt compound is any one of titanium tetrachloride, titanium sulfate or titanyl sulfate.
2. The decolorization method according to claim 1, characterized in that: in the reactive dye wastewater, the mass percent of the reactive dye in the wastewater is 0.001-0.01%.
3. A method for recycling functional powder, which can be used for rapidly and efficiently purifying reactive dye wastewater, is characterized in that:
adding 0.5-2 g of the prepared functional powder into 1000mL of reactive dye wastewater for 1-2 min, so that the reactive dye wastewater can be completely decolorized;
the preparation method of the functional powder comprises the following steps:
(1) preparing a solution A: uniformly mixing a titanate compound or a titanium salt compound with a proper amount of an alcohol solvent 1, and then adding an inorganic acid to adjust the pH value of the mixed solution to 1-5 to obtain a solution A; wherein: the volume ratio of the titanate compound or the titanium salt compound to the alcohol solvent 1 is 1: 6-1: 15;
(2) preparing a solution C: taking a proper amount of alcohol solvent 2, uniformly mixing with deionized water to obtain solution B, then adding a proper amount of cellulose powder into solution B, and uniformly mixing to obtain solution C; wherein: the volume ratio of the alcohol solvent 2 to the deionized water is 1: 8-1: 15;
(3) slowly adding the solution A obtained in the step (1) into the solution C obtained in the step (2), uniformly stirring, heating to 40-60 ℃, reacting at a constant temperature for 4-8 hours, and filtering and drying a product after the reaction is finished to obtain functional powder;
the alcohol solvent 1 and the alcohol solvent 2 are any one of absolute ethyl alcohol and isopropanol;
the inorganic acid in the step (1) is any one of hydrochloric acid, nitric acid and sulfuric acid;
the mass ratio of the cellulose powder to the liquid B in the step (2) is 1 g: 90 ml-1 g: 160 ml; the titanate compound in the step (1) is any one of n-butyl titanate, isobutyl titanate or tetraisopropyl titanate; the titanium salt compound is any one of titanium tetrachloride, titanium sulfate or titanyl sulfate;
the recycling method specifically comprises the following steps:
taking out the functional powder which is subjected to decoloring treatment and adsorbs the reactive dye, preparing a suspension with a solid content of 70-75% by using deionized water, continuously irradiating the suspension for 10-30 min under an ultraviolet lamp or continuously irradiating for 10-15 d under a natural light condition until the reactive dye molecules adsorbed on the surface of the functional powder are completely decomposed by self to obtain decoloring functional powder, and adding the decoloring functional powder into the reactive dye wastewater again for decoloring.
4. The recycling method according to claim 3, wherein: the power of the ultraviolet lamp is 300-1000W.
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