CN113083234B - Adsorbent for adsorbing dye-containing wastewater, preparation method and application - Google Patents

Adsorbent for adsorbing dye-containing wastewater, preparation method and application Download PDF

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CN113083234B
CN113083234B CN202110251106.9A CN202110251106A CN113083234B CN 113083234 B CN113083234 B CN 113083234B CN 202110251106 A CN202110251106 A CN 202110251106A CN 113083234 B CN113083234 B CN 113083234B
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dye
adsorbent
containing wastewater
adsorbing
adsorption
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CN113083234A (en
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贠江妮
杨锦
满振武
杨燕伟
曾丽如
刘竹青
闫军锋
赵武
张志勇
王英楠
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Northwest University
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • 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
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/46—Materials comprising a mixture of inorganic and organic materials
    • 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
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
    • 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
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/308—Dyes; Colorants; Fluorescent agents
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/36—Organic compounds containing halogen
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/40—Organic compounds containing sulfur
    • 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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  • Hydrology & Water Resources (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
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Abstract

The invention provides a preparation method of an adsorbent for adsorbing dye-containing wastewater, which is prepared by taking hexabromobenzene and calcium carbide as raw materials and adopting a mechanochemical method, wherein the mechanochemical method comprises the following steps: the method comprises the following steps: grinding calcium carbide into powder, mixing with hexabromobenzene, and adding absolute ethyl alcohol for ball milling; step two: drying and calcining the ball-milled sample, and removing unreacted hexabromobenzene to obtain a crude product; step three: and (4) washing and drying the crude product obtained in the step two to obtain the adsorbent for adsorbing the dye-containing wastewater. The adsorbent for adsorbing the dye-containing wastewater obtained by the invention has a fast adsorption rate, and the removal rate of 30mg/L rhodamine B solution in 10 minutes reaches more than 95%. The adsorption capacity for rhodamine B is 386.10mg/g, the adsorption capacity for methylene blue is 357.14mg/g, and the adsorption capacity for Congo red is 254.45 mg/g.

Description

Adsorbent for adsorbing dye-containing wastewater, preparation method and application
Technical Field
The invention belongs to the technical field of preparation methods and application of adsorption materials, and particularly relates to an adsorbent for adsorbing dye-containing wastewater, a preparation method and application.
Background
In recent years, the production and process of the dye are continuously developed and updated, and the pollution emission problem is more and more serious. The treatment of dye waste water is necessary, and the common methods comprise an adsorption method, a membrane separation technology, an electrolysis method and a photocatalysis method. Among them, the adsorption method is widely used because of its advantages such as simple operation, low cost, and high removal rate. The adsorption material of the existing dye adsorption method has the problems of insufficient adsorption speed and poor adsorption capacity.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an adsorbent for adsorbing dye-containing wastewater, a preparation method and application thereof, and solves the technical problems of insufficient adsorption speed and poor adsorption capacity of an adsorption material in the prior art.
In order to achieve the purpose, the technical scheme is as follows: the preparation method of the adsorbent for adsorbing the dye-containing wastewater comprises the following steps of preparing hexabromobenzene and calcium carbide serving as raw materials by a mechanochemical method, wherein the mechanochemical method comprises the following steps:
the method comprises the following steps: grinding calcium carbide into powder, mixing with hexabromobenzene, placing grinding balls into a ball milling tank, and adding absolute ethyl alcohol for ball milling;
step two: after the ball milling is finished, taking out the ball milled sample, drying and calcining the ball milled sample, and removing unreacted hexabromobenzene to obtain a crude product;
step three: and (4) washing the crude product obtained in the step two by using dilute nitric acid, deionized water and absolute ethyl alcohol, and drying to obtain the adsorbent for adsorbing the dye-containing wastewater.
The molar ratio of the calcium carbide to the hexabromobenzene is 6: 1-18: with reference to the effect of adsorbing methylene blue dye as a reference condition, as shown in fig. 1, the ratio of the adsorption time to the adsorption time is preferably 6: 1.
the ball milling process is that ball milling is carried out for 16 hours at the speed of 450 r/min, and the mass ratio of the milling balls to the calcium carbide and the hexabromobenzene is 9: 1-24: with reference to the effect of adsorbing methylene blue dye as a reference condition, as shown in fig. 2, the ratio of the adsorption time to the adsorption time is preferably 12: 1.
the calcination condition is 300-600 ℃, the reference condition is the effect of adsorbing methylene blue dye, as shown in figure 3, the calcination is preferably carried out for 2 hours at 400 ℃, and the drying condition is 60-80 ℃.
The particle size of the adsorbent for adsorbing the dye-containing wastewater is 1-10 microns;
an adsorbent for adsorbing dye-containing wastewater is prepared by the method.
The adsorbent for adsorbing the dye-containing wastewater prepared by the method is applied to adsorbing the dye-containing wastewater.
The using amount of the adsorbent for adsorbing the dye-containing wastewater is 0.125-0.5 g/L of wastewater, the concentration of the dye is 5-30 mg/L, the adsorption of the dye-containing wastewater is carried out in a constant-temperature stirrer at the temperature of 25 ℃ for 0.5-180 minutes, the wastewater is stirred at constant temperature and then centrifugally separated, and the filtrate is adjusted to be neutral and discharged.
The dye is rhodamine B, methylene blue or Congo red.
Compared with the prior art, the invention has the beneficial technical effects that:
the adsorbing agent for adsorbing the dye-containing wastewater obtained by the invention has a fast adsorbing speed, and the removal rate of 30mg/L rhodamine B solution in 10 minutes reaches more than 95%.
(II) the adsorbing capacity of the adsorbent for adsorbing dye-containing wastewater obtained by the invention on rhodamine B is up to 386.10mg/g, the adsorbing capacity on methylene blue is 357.14mg/g, and the adsorbing capacity on Congo red is 254.45 mg/g.
The preparation method of the invention is simple, low in cost and convenient for popularization.
Drawings
Fig. 1 is a graph showing the adsorption effect of adsorbents prepared at different molar ratios on methylene blue, wherein (a) the molar ratio is 6: 1, (b) the molar ratio of 9: 1, (c) a molar ratio of 12: 1, (d) a molar ratio of 18: 1
FIG. 2 is a graph showing the adsorption effect of adsorbents prepared under different mass ratios of grinding balls to calcium carbide and hexabromobenzene on methylene blue, wherein (a) the mass ratio is 9: 1, (b) mass ratio 12: 1, (c) mass ratio of 18: 1, (d) mass ratio 24: 1
FIG. 3 is a graph showing the adsorption effect of adsorbents prepared at different calcination temperatures on methylene blue, wherein the adsorbents are (a) at 300 ℃, (b) at 400 ℃, (c) at 500 ℃, (d) at 600 ℃
FIG. 4 is a structural representation of the adsorbent prepared in example 1 for adsorbing dye-containing wastewater:
(a) is a Raman spectrum
(b) Is X-ray diffraction peak
(c) For full scan XPS spectra
(d) High resolution XPS spectra for the C1s orbit
FIG. 5 is an adsorption curve of an adsorbent for adsorbing dye-containing wastewater on rhodamine B
FIG. 6 is an adsorption time curve of rhodamine B by an adsorbent for adsorbing dye-containing wastewater
FIG. 7 is an isotherm curve of rhodamine B adsorption by an adsorbent for adsorbing dye-containing wastewater
FIG. 8 is a graph showing the absorbance curves of methylene blue and Congo red by the adsorbent adsorbing the dye-containing wastewater
FIG. 9 is the adsorption curve and adsorption isotherm of the adsorbent adsorbing dye-containing wastewater on methylene blue and Congo red
The details of the present invention are explained in further detail below with reference to the drawings and examples.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
The preparation method of the adsorbent for adsorbing the dye-containing wastewater comprises the following steps of preparing hexabromobenzene and calcium carbide serving as raw materials by a mechanochemical method, wherein the mechanochemical method comprises the following steps:
the method comprises the following steps: grinding calcium carbide into powder, mixing with hexabromobenzene, placing grinding balls into a ball milling tank, and adding absolute ethyl alcohol for ball milling;
step two: after the ball milling is finished, taking out the ball milled sample, drying and calcining the ball milled sample, and removing unreacted hexabromobenzene to obtain a crude product;
step three: and (4) washing the crude product obtained in the step two by using dilute nitric acid, deionized water and absolute ethyl alcohol, and drying to obtain the adsorbent for adsorbing the dye-containing wastewater.
The molar ratio of the calcium carbide to the hexabromobenzene is 6: 1-18: with reference to the effect of adsorbing methylene blue dye as a reference condition, as shown in fig. 1, the ratio of the adsorption time to the adsorption time is preferably 6: 1.
the ball milling process is that ball milling is carried out for 16 hours at the speed of 450 r/min, and the mass ratio of the milling balls to the calcium carbide and the hexabromobenzene is 9: 1-24: with reference to the effect of adsorbing methylene blue dye as a reference condition, as shown in fig. 2, the ratio of the adsorption time to the adsorption time is preferably 12: 1.
the calcination condition is 300-600 ℃, the reference condition is the effect of adsorbing methylene blue dye, as shown in figure 3, the calcination is preferably carried out for 2 hours at 400 ℃, and the drying condition is 60-80 ℃.
The particle size of the adsorbent for adsorbing the dye-containing wastewater is 1-10 microns;
an adsorbent for adsorbing dye-containing wastewater is prepared by the method.
The adsorbent for adsorbing the dye-containing wastewater prepared by the method is applied to adsorbing the dye-containing wastewater.
The using amount of the adsorbent for adsorbing the dye-containing wastewater is 0.125-0.5 g/L of wastewater, the concentration of the dye is 5-30 mg/L, the adsorption of the dye-containing wastewater is carried out in a constant-temperature stirrer at the temperature of 25 ℃ for 0.5-180 minutes, the wastewater is stirred at constant temperature and then centrifugally separated, and the filtrate is adjusted to be neutral and discharged.
The dye is rhodamine B, methylene blue or Congo red.
The vertical lines in fig. 1 are not present, and for the sake of more clearly showing the contents of the figure, the intersection points of the vertical lines and the curve in fig. 1(a) are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 1(b), the intersection points of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 1(c), the intersection points of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 1(d), the intersection points of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; .
The vertical lines in fig. 2 are not present, and for the sake of more clearly showing the contents of the figure, the intersection points of the vertical lines and the curve in fig. 2(a) are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 2(b), the intersection points of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 2(c), the intersection points of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 2(d), the intersections of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence.
The vertical lines in fig. 3 are not present, and for the sake of more clearly showing the contents of the figure, the intersection points of the vertical lines and the curve in fig. 3(a) are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 3(b), the intersection points of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 3(c), the intersection points of the vertical lines and the curves are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence; in FIG. 3(d), the intersections of the vertical lines and the curved lines are MB, 1min, 2min, 5min, 10min, 20min and 30min in sequence.
Example 1:
according to the experimental scheme, the molar ratio of calcium carbide to hexabromobenzene is 6: 1, grinding 2g of calcium carbide into powder, mixing the powder with 3g of hexabromobenzene powder, adding the mixture into a 50ml ball milling tank, and adding a certain amount of absolute ethyl alcohol; sealing the ball milling tank, and carrying out ball milling for 16h at the speed of 450 revolutions per minute to obtain white slurry for drying; calcining the waste water in an argon atmosphere furnace at the temperature of 400 ℃ for 2h, washing and drying the waste water, and the like to finally obtain black powder adsorbent for adsorbing dye-containing waste water.
The adsorbent prepared in this example had a specific surface area of 22.9317m 2 /g。
It was structurally characterized, and FIG. 4(a) is its original Raman spectrum (black lines) and smoothed lines with a fast Fourier transform filter (white lines), 1336cm -1 The D peak at (A) represents the defect and disordered structure of the carbonaceous solid, 1584cm -1 The G peak at (A) is the vibration from sp2 hybridized carbon in the benzene ring, 2000cm -1 Two weak peaks nearby are generated by the vibration of the acetylene bond, and Raman results prove that sp and sp2 hybridized carbon exists in the sample. (b) The three peaks correspond to the crystal plane (211), (220) and (422) respectively, which are the X-ray diffraction peaks. (c) It is an XPS survey showing up to 88.43% carbon and 11.57% oxygen, which may be air from surface adsorption. (d) It is a high-resolution XPS spectrum of C1s, and it can be seen that the area ratio of sp2 hybridized carbon to sp hybridized carbon is 1: 1, the prepared sample was determined to be gamma-graphite monoalkyne.
Example 2:
weighing 10mg of the sample obtained in the embodiment 1, weighing 40mL of the prepared rhodamine B solution with the concentration of 30mg/L, mixing the two solutions, pouring the two solutions into a glass bottle, controlling the temperature at 25 ℃, starting stirring, transferring a certain amount of the solution after 0.5min, 1min, 1.5min, 2min, 5min, 10min and 20min respectively, carrying out centrifugation on the solution to extract a supernatant, and measuring the absorbance of the supernatant by utilizing ultraviolet and visible spectrophotometry, wherein the effect is shown in figure 5, and the maximum absorption wavelength of the rhodamine B is 555 nm. It can be seen that the absorbance of rhodamine B at 10min was already close to 0.
The vertical lines in fig. 5 are not present, and for the sake of more clearly showing the contents of the figure, the intersection points of the vertical lines and the curves in fig. 2 are RhB, 0.5min, 1min, 1.5min, 2min, 5min, 10min and 20min from top to bottom.
Example 3:
and (3) obtaining a standard curve of the rhodamine B solution by measuring a series of rhodamine B absorbance curves with different concentrations, and further obtaining a relational expression between the absorbance and the concentration of the rhodamine B solution. The data obtained in example 2 were processed to obtain an adsorption time curve for adsorbing rhodamine B as shown in fig. 6. As can be seen, the adsorption rate is very fast in the first 10min, and the removal rate of rhodamine B in 10min reaches over 95 percent.
Example 4:
weighing 10mg of the adsorbent adsorbing the dye-containing wastewater obtained in the example 1, preparing rhodamine B solutions of 60mg/L, 80mg/L, 100mg/L and 120mg/L, respectively putting the adsorbent adsorbing the dye-containing wastewater into high-concentration rhodamine B solutions for adsorption, drawing a curve of residual dye concentration and adsorption quantity in adsorption equilibrium, and fitting the curve with a Langmuir model and a Freundich model as shown in FIG. 7 to find that the correlation coefficient with the Langmuir model reaches 0.9939, thereby calculating that the maximum adsorption quantity reaches 386.1mg/g and is basically consistent with the value obtained by the experiment.
Example 5:
the adsorbent adsorbing the dye-containing wastewater obtained in example 1 was subjected to adsorption test tests with a methylene blue solution and a congo red solution, as shown in fig. 9, it can be seen that the adsorbent adsorbing the dye-containing wastewater also exhibits excellent adsorption effects on methylene blue (a) and congo red (b), and experiments similar to example 4 were performed, as shown in fig. 8, and adsorption time curves and adsorption isotherms of the adsorbent adsorbing the dye-containing wastewater on methylene blue and congo red were also obtained, respectively, with the adsorption amount of methylene blue being 357.14mg/g and the adsorption amount of congo red being 254.45 mg/g.
The vertical lines in fig. 8 are not present, and for the sake of more clearly showing the contents of the figure, the intersections of the vertical lines and the curved lines in fig. 8(a) are MB, 0.5min, 1min, 1.5min, 2min, 5min and 10min in sequence. In FIG. 8(b), the crossing points of the vertical line and the curve are CR, 0.5min, 1min, 1.5min, 2min, 5min, 10min, 20min and 30min in sequence.
Comparative example:
Figure BDA0002966099250000081
【1】Activatedcarbon derivedfromcarbon residuefrombiomassgasificationandits application for dyeadsorption:Kinetics,isothermsand thermodynamicstudies
【2】Adsorptionand removalof rhodamine Bfromaqueoussolutionbytannicacidfunctionalizedgraphene
【3】Enhanced adsorption of Rhodamine Bbymagneticnitrogendoped porous carbonprepared frombimetallicZIFs
【4】Application of CarbonizedMetal-Organic-FrameworkasEfficient Adsorbent of CationicDye
【5】Efficientremoval of methylenebluefromaqueoussolutions using magneticgrapheneoxide modifiedzeolite
【6】Fabricationof ultralightgraphene-basedgels andtheir adsorption of methylene blue
【7】MesoporouscompositeNi-C-N/SAfor selectiveadsorption of methylene bluefromwater
【8】Highlyenhanced adsorption of consg red ontographeneoxidechitosanfibers bywet-chemical-etching off silica nanoparticles
【9】UV-irradiated carbonnanotubessynthesizedfromfly ashforadsorption of congoreddyesinaqueous solutione
【10】Synthesisand adsorption performance ofMg(OH) 2 hexagonal nanosheet-grapheneoxide compositese
【11】Afacile hydrothermal synthesis,adsorption kinetics andisotherms to CongoRed azodyefromaqueoussolutionof NiO/graphene nanosheets adsorbent
the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (1)

1. The application of the adsorbent in adsorption of dye-containing wastewater is characterized in that the amount of the adsorbent for adsorption of dye-containing wastewater is 0.125-0.5 g/L of wastewater, the concentration of dye is 5-30 mg/L, the adsorption of dye-containing wastewater is carried out in a constant-temperature stirrer at the temperature of 25 ℃ for 0.5-180 minutes, the wastewater is subjected to centrifugal separation after being stirred at the constant temperature, and filtrate is adjusted to be neutral and discharged;
the dye is rhodamine B, methylene blue or Congo red;
the preparation method of the adsorbent for adsorbing the dye-containing wastewater comprises the following steps of preparing the adsorbent by taking hexabromobenzene and calcium carbide as raw materials through a mechanochemical method, wherein the mechanochemical method comprises the following steps:
the method comprises the following steps: grinding calcium carbide into powder, mixing with hexabromobenzene, adding absolute ethyl alcohol, and ball milling;
step two: drying and calcining the ball-milled sample, and removing unreacted hexabromobenzene to obtain a crude product;
step three: washing and drying the crude product obtained in the step two to obtain an adsorbent for adsorbing the dye-containing wastewater;
the molar ratio of the calcium carbide to the hexabromobenzene is 3: 1-18: 1;
the ball milling process is that ball milling is carried out for 16 hours at the speed of 450 r/min, and the mass ratio of the milling balls to the calcium carbide and the hexabromobenzene is 6: 1-24: 1;
the calcining condition is calcining for 2 hours at 300-400 ℃, and the drying condition is 60-80 ℃;
the particle size of the adsorbent for adsorbing the dye-containing wastewater is 1-10 microns.
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