CN112023886A - Environment-friendly adsorbent for aluminum ions in concentrated alkaline water and preparation method thereof - Google Patents
Environment-friendly adsorbent for aluminum ions in concentrated alkaline water and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an environment-friendly adsorbent for aluminum ions in concentrated alkaline water, which is prepared from the following raw materials in parts by weight: 35-50 parts of modified kaolin, 10-20 parts of calcium oxide, 3-5 parts of montmorillonite, 5-10 parts of graphene oxide, 100 parts of deionized water, 1-3 parts of acetic acid, 1-3 parts of chitosan and 0.5-1 part of reducing agent; the invention also discloses a preparation method of the aluminum ion environment-friendly adsorbent in the concentrated alkaline water; in the preparation process, in the step S2, the compound A is added into dimethyl sulfoxide, the dimethyl sulfoxide can be inserted into the layers of kaolin, the interlayer spacing is further increased, then, the dimethyl sulfoxide is transferred into methanol for ultrasonic treatment, part of methanol molecules can be dehydrated with hydroxyl on the inner surface of the kaolin to form methoxyl, and part of methanol molecules can be inserted into the layers in a free state, and finally, the modified kaolin is prepared, and has larger interlayer spacing and holes and excellent adsorption performance.
Description
Technical Field
The invention belongs to the technical field of concentrated alkaline water recovery, and particularly relates to an environment-friendly adsorbent for aluminum ions in concentrated alkaline water and a preparation method thereof.
Background
The aluminium-containing concentrated alkali waste liquid is a waste liquid with high alkali content, and a common acid-alkali neutralization method is used, so that a large amount of acid is wasted, and a huge amount of waste residues and waste water are generated. When the aluminum hydroxide is treated by an aluminum hydroxide crystallization method, the investment is huge, the removal rate of aluminum ions can only reach about 50 percent, and pipelines, valves and crystallization tanks are seriously scaled, which is very troublesome. Most aluminum processing enterprises not only consume a large amount of caustic soda flake use cost, but also treat a large amount of concentrated caustic soda wastewater, thereby forming huge social resource waste.
Chinese invention patent CN107583620A discloses a chitosan-based metal ion adsorbent and a preparation method and application thereof. The preparation method of the chitosan-based metal ion adsorbent comprises the following steps: 1) SiO with amino surface modified2Dispersing the nano powder in low molecular alcohol, and adding citric acid to react to prepare modified citric acid; 2) dispersing chitosan and an activating agent in low molecular alcohol, and adding the modified citric acid obtained in the step 1) to react to obtain the chitosan/citric acid modified citric acid. The chitosan-based metal ion adsorbent provided by the invention is prepared by modifying citric acid and SiO with amino surface2The chitosan structure is introduced, so that heavy metal adsorption active sites of the adsorbent are increased, and the adsorption capacity of heavy metal ions is further enhanced; the adsorption product is easy to settle and separate from the water body, and can be directly and effectively applied to sewage treatment.
Disclosure of Invention
In order to overcome the technical problems, the invention provides an environment-friendly adsorbent for aluminum ions in concentrated alkaline water and a preparation method thereof.
In the invention, dimethyl sulfoxide can be inserted into the layers of kaolin to further increase the interlayer spacing, then, by transferring to methanol for ultrasonic treatment, a part of methanol molecules can be dehydrated with hydroxyl on the inner surface of the kaolin to form methoxyl, and a part of methanol molecules can be inserted into the layers in a free state, in step S3, nano kaolin and dodecyl trimethyl ammonium bromide are subjected to ultrasonic treatment in a mixed solvent for 4 hours, the dodecyl trimethyl ammonium bromide can form holes on the layers of the nano kaolin, and finally, the modified kaolin is prepared.
The purpose of the invention can be realized by the following technical scheme:
an environment-friendly adsorbent for aluminum ions in concentrated alkaline water is prepared from the following raw materials in parts by weight: 35-50 parts of modified kaolin, 10-20 parts of calcium oxide, 3-5 parts of montmorillonite, 5-10 parts of graphene oxide, 100 parts of deionized water, 1-3 parts of acetic acid, 1-3 parts of chitosan and 0.5-1 part of reducing agent;
the environment-friendly adsorbent is prepared by the following method:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding a reducing agent into the mixed solution D, uniformly stirring at a rotating speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75-80 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
Further, the modified kaolin is prepared by the following method:
step S1, mixing kaolin and potassium acetate uniformly according to a weight ratio of 1: 1, adding deionized water for mixing, carrying out mild grinding for 30min, standing for 20h, drying in a 55-60 ℃ water bath for 10h to obtain treated kaolin, adding the treated kaolin into a hydrochloric acid solution with the mass fraction of 10%, carrying out magnetic stirring for 20min at a rotating speed of 120r/min, carrying out suction filtration, washing with absolute ethyl alcohol for three times, transferring to a 55-60 ℃ drying box, and drying for 20h to obtain a compound A;
step S2, adding the compound A, dimethyl sulfoxide and deionized water into a three-neck flask, heating in a water bath at 55-60 ℃, uniformly stirring for 10 hours, performing suction filtration, washing for three times with absolute ethyl alcohol, drying for 10 hours at 70 ℃ to obtain a compound B, dispersing the compound B in methanol, performing ultrasonic treatment for 4 hours, taking out and transferring the compound B into a reaction kettle with a polytetrafluoroethylene lining, reacting for 10 hours at 130-140 ℃, washing for three times with absolute ethyl alcohol, and drying to obtain nano kaolin, wherein the weight ratio of the compound A, the dimethyl sulfoxide and the deionized water is controlled to be 1: 10: 1;
and step S3, adding the prepared nano kaolin into a mixed solvent, performing ultrasonic treatment for 4 hours, then adding dodecyl trimethyl ammonium bromide, performing uniform stirring and ultrasonic treatment for 4 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, and drying to prepare the modified kaolin, wherein the weight ratio of the nano kaolin to the mixed solvent to the dodecyl trimethyl ammonium bromide is controlled to be 1: 50: 0.01.
Step S1, kaolin and potassium acetate are uniformly mixed according to the weight ratio of 1: 1, then deionized water is added, acetate ions can be inserted at the interlayer position of the kaolin, the interlayer spacing of the kaolin is enlarged, then the mixture is added into hydrochloric acid solution with the mass fraction of 10%, potassium acetate ions are removed through acid cleaning, the structure of the kaolin is still kept, a compound A is prepared, then the compound A is added into dimethyl sulfoxide in step S2, the dimethyl sulfoxide can be inserted into the interlayer of the kaolin, the interlayer spacing of the kaolin is further increased, then, by transferring the mixture into methanol for ultrasonic treatment, a part of methanol molecules can be dehydrated with hydroxyl on the inner surface of the kaolin to form methoxyl, a part of the methanol molecules can be inserted into the interlayer in a free state, in step S3, the nano kaolin and dodecyl trimethyl ammonium bromide are subjected to ultrasonic treatment in the mixed solvent for 4 hours, and the dodecyl trimethyl ammonium bromide can form holes on the layer of the, finally, the modified kaolin is prepared, and the kaolin has larger interlayer spacing and holes and excellent adsorption performance.
Further, in step S1, the weight ratio of kaolin to deionized water is controlled to 10: 1, and the mass ratio of the treated kaolin to a hydrochloric acid solution with a mass fraction of 10% is controlled to 1: 50.
Further, the reducing agent is one or two of VC and sodium borohydride which are mixed according to any proportion.
A preparation method of an aluminum ion environment-friendly adsorbent in concentrated alkaline water comprises the following steps:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding a reducing agent into the mixed solution D, uniformly stirring at a rotating speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75-80 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
The invention has the beneficial effects that:
the invention prepares an environment-friendly adsorbent for aluminum ions in concentrated alkaline water, modified kaolin and calcium oxide and the like are used as raw materials, the modified kaolin has excellent adsorption performance and can adsorb the aluminum ions in the concentrated alkaline water, and the raw materials meet the requirement of environmental protection, in the preparation process, in step S1, the modified kaolin is uniformly mixed with potassium acetate according to the weight ratio of 1: 1 and then added with deionized water, acetate ions can be inserted at the interlayer position of the kaolin to enlarge the interlayer spacing of the kaolin, then the modified kaolin is added into hydrochloric acid solution with the mass fraction of 10 percent, the potassium acetate ions are removed by acid cleaning, the kaolin still keeps the structure, a compound A is prepared, then in step S2, the compound A is added into dimethyl sulfoxide which can be inserted between the layers of the kaolin to further enlarge the interlayer spacing, then the modified kaolin is transferred into methanol for ultrasonic treatment, in step S3, nanometer kaolin and dodecyl trimethyl ammonium bromide are ultrasonically treated in mixed solvent for 4 hr to form holes in the nanometer kaolin layer, so as to prepare modified kaolin with great interlayer distance and holes and excellent adsorption performance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An environment-friendly adsorbent for aluminum ions in concentrated alkaline water is prepared from the following raw materials in parts by weight: 35 parts of modified kaolin, 10 parts of calcium oxide, 3 parts of montmorillonite, 5 parts of graphene oxide, 100 parts of deionized water, 1 part of acetic acid, 1 part of chitosan and 0.5 part of VC;
the environment-friendly adsorbent is prepared by the following method:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding VC into the mixed solution D, stirring at a constant speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
The modified kaolin is prepared by the following method:
step S1, mixing kaolin and potassium acetate uniformly according to the weight ratio of 1: 1, then adding deionized water for mixing, carrying out mild grinding for 30min, standing for 20h, then drying in a 55 ℃ water bath for 10h to obtain treated kaolin, then adding the treated kaolin into a hydrochloric acid solution with the mass fraction of 10%, magnetically stirring for 20min at the rotating speed of 120r/min, carrying out suction filtration, washing with absolute ethyl alcohol for three times, transferring to a 55 ℃ drying box for drying for 20h to obtain a compound A, controlling the weight ratio of the kaolin to the deionized water to be 10: 1, and controlling the mass ratio of the treated kaolin to the hydrochloric acid solution with the mass fraction of 10% to be 1: 50;
step S2, adding the compound A, dimethyl sulfoxide and deionized water into a three-neck flask, heating in a water bath at 55 ℃ and stirring at a constant speed for 10 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, drying at 70 ℃ for 10 hours to obtain a compound B, dispersing the compound B in methanol, performing ultrasonic treatment for 4 hours, taking out and transferring the compound B into a reaction kettle with a polytetrafluoroethylene lining, reacting at 130 ℃ for 10 hours, washing with absolute ethyl alcohol for three times, and drying to obtain nano kaolin, wherein the weight ratio of the compound A to the dimethyl sulfoxide to the deionized water is controlled to be 1: 10: 1;
and step S3, adding the prepared nano kaolin into a mixed solvent, performing ultrasonic treatment for 4 hours, then adding dodecyl trimethyl ammonium bromide, performing uniform stirring and ultrasonic treatment for 4 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, and drying to prepare the modified kaolin, wherein the weight ratio of the nano kaolin to the mixed solvent to the dodecyl trimethyl ammonium bromide is controlled to be 1: 50: 0.01.
Example 2
An environment-friendly adsorbent for aluminum ions in concentrated alkaline water is prepared from the following raw materials in parts by weight: 40 parts of modified kaolin, 12 parts of calcium oxide, 4 parts of montmorillonite, 8 parts of graphene oxide, 120 parts of deionized water, 2 parts of acetic acid, 2 parts of chitosan and 0.8 part of VC;
the environment-friendly adsorbent is prepared by the following method:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding VC into the mixed solution D, stirring at a constant speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
The modified kaolin is prepared by the following method:
step S1, mixing kaolin and potassium acetate uniformly according to the weight ratio of 1: 1, then adding deionized water for mixing, carrying out mild grinding for 30min, standing for 20h, then drying in a 55 ℃ water bath for 10h to obtain treated kaolin, then adding the treated kaolin into a hydrochloric acid solution with the mass fraction of 10%, magnetically stirring for 20min at the rotating speed of 120r/min, carrying out suction filtration, washing with absolute ethyl alcohol for three times, transferring to a 55 ℃ drying box for drying for 20h to obtain a compound A, controlling the weight ratio of the kaolin to the deionized water to be 10: 1, and controlling the mass ratio of the treated kaolin to the hydrochloric acid solution with the mass fraction of 10% to be 1: 50;
step S2, adding the compound A, dimethyl sulfoxide and deionized water into a three-neck flask, heating in a water bath at 55 ℃ and stirring at a constant speed for 10 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, drying at 70 ℃ for 10 hours to obtain a compound B, dispersing the compound B in methanol, performing ultrasonic treatment for 4 hours, taking out and transferring the compound B into a reaction kettle with a polytetrafluoroethylene lining, reacting at 130 ℃ for 10 hours, washing with absolute ethyl alcohol for three times, and drying to obtain nano kaolin, wherein the weight ratio of the compound A to the dimethyl sulfoxide to the deionized water is controlled to be 1: 10: 1;
and step S3, adding the prepared nano kaolin into a mixed solvent, performing ultrasonic treatment for 4 hours, then adding dodecyl trimethyl ammonium bromide, performing uniform stirring and ultrasonic treatment for 4 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, and drying to prepare the modified kaolin, wherein the weight ratio of the nano kaolin to the mixed solvent to the dodecyl trimethyl ammonium bromide is controlled to be 1: 50: 0.01.
Example 3
An environment-friendly adsorbent for aluminum ions in concentrated alkaline water is prepared from the following raw materials in parts by weight: 45 parts of modified kaolin, 18 parts of calcium oxide, 4 parts of montmorillonite, 8 parts of graphene oxide, 140 parts of deionized water, 2 parts of acetic acid, 3 parts of chitosan and 0.8 part of VC;
the environment-friendly adsorbent is prepared by the following method:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding VC into the mixed solution D, stirring at a constant speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
The modified kaolin is prepared by the following method:
step S1, mixing kaolin and potassium acetate uniformly according to the weight ratio of 1: 1, then adding deionized water for mixing, carrying out mild grinding for 30min, standing for 20h, then drying in a 55 ℃ water bath for 10h to obtain treated kaolin, then adding the treated kaolin into a hydrochloric acid solution with the mass fraction of 10%, magnetically stirring for 20min at the rotating speed of 120r/min, carrying out suction filtration, washing with absolute ethyl alcohol for three times, transferring to a 55 ℃ drying box for drying for 20h to obtain a compound A, controlling the weight ratio of the kaolin to the deionized water to be 10: 1, and controlling the mass ratio of the treated kaolin to the hydrochloric acid solution with the mass fraction of 10% to be 1: 50;
step S2, adding the compound A, dimethyl sulfoxide and deionized water into a three-neck flask, heating in a water bath at 55 ℃ and stirring at a constant speed for 10 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, drying at 70 ℃ for 10 hours to obtain a compound B, dispersing the compound B in methanol, performing ultrasonic treatment for 4 hours, taking out and transferring the compound B into a reaction kettle with a polytetrafluoroethylene lining, reacting at 130 ℃ for 10 hours, washing with absolute ethyl alcohol for three times, and drying to obtain nano kaolin, wherein the weight ratio of the compound A to the dimethyl sulfoxide to the deionized water is controlled to be 1: 10: 1;
and step S3, adding the prepared nano kaolin into a mixed solvent, performing ultrasonic treatment for 4 hours, then adding dodecyl trimethyl ammonium bromide, performing uniform stirring and ultrasonic treatment for 4 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, and drying to prepare the modified kaolin, wherein the weight ratio of the nano kaolin to the mixed solvent to the dodecyl trimethyl ammonium bromide is controlled to be 1: 50: 0.01.
Example 4
An environment-friendly adsorbent for aluminum ions in concentrated alkaline water is prepared from the following raw materials in parts by weight: 50 parts of modified kaolin, 20 parts of calcium oxide, 5 parts of montmorillonite, 10 parts of graphene oxide, 150 parts of deionized water, 3 parts of acetic acid, 3 parts of chitosan and 1 part of VC;
the environment-friendly adsorbent is prepared by the following method:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding VC into the mixed solution D, stirring at a constant speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
The modified kaolin is prepared by the following method:
step S1, mixing kaolin and potassium acetate uniformly according to the weight ratio of 1: 1, then adding deionized water for mixing, carrying out mild grinding for 30min, standing for 20h, then drying in a 55 ℃ water bath for 10h to obtain treated kaolin, then adding the treated kaolin into a hydrochloric acid solution with the mass fraction of 10%, magnetically stirring for 20min at the rotating speed of 120r/min, carrying out suction filtration, washing with absolute ethyl alcohol for three times, transferring to a 55 ℃ drying box for drying for 20h to obtain a compound A, controlling the weight ratio of the kaolin to the deionized water to be 10: 1, and controlling the mass ratio of the treated kaolin to the hydrochloric acid solution with the mass fraction of 10% to be 1: 50;
step S2, adding the compound A, dimethyl sulfoxide and deionized water into a three-neck flask, heating in a water bath at 55 ℃ and stirring at a constant speed for 10 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, drying at 70 ℃ for 10 hours to obtain a compound B, dispersing the compound B in methanol, performing ultrasonic treatment for 4 hours, taking out and transferring the compound B into a reaction kettle with a polytetrafluoroethylene lining, reacting at 130 ℃ for 10 hours, washing with absolute ethyl alcohol for three times, and drying to obtain nano kaolin, wherein the weight ratio of the compound A to the dimethyl sulfoxide to the deionized water is controlled to be 1: 10: 1;
and step S3, adding the prepared nano kaolin into a mixed solvent, performing ultrasonic treatment for 4 hours, then adding dodecyl trimethyl ammonium bromide, performing uniform stirring and ultrasonic treatment for 4 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, and drying to prepare the modified kaolin, wherein the weight ratio of the nano kaolin to the mixed solvent to the dodecyl trimethyl ammonium bromide is controlled to be 1: 50: 0.01.
Comparative example 1
In comparison with example 1, this comparative example, in which kaolin was used in place of the modified kaolin, was prepared as follows:
firstly, adding kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding VC into the mixed solution D, stirring at a constant speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
Comparative example 2
The comparative example is a heavy metal ion adsorbent in the market.
The adsorption performance of examples 1 to 4 and comparative examples 1 to 2 was examined, and the results are shown in the following table;
from the above table, Al of examples 1 to 4 can be seen3+An adsorption amount of 235-248mg/g, Al of comparative example 1-23+The adsorption capacity is 105-185 mg/g; therefore, in the step S2, the compound A is added into dimethyl sulfoxide, the dimethyl sulfoxide can be inserted into the layers of kaolin, the interlayer spacing is further increased, then, the compound A is transferred into methanol for ultrasonic treatment, a part of methanol molecules can be dehydrated with hydroxyl on the inner surface of the kaolin to form methoxyl, a part of methanol molecules can be inserted into the layers in a free state, in the step S3, the nano kaolin and dodecyl trimethyl ammonium bromide are subjected to ultrasonic treatment in a mixed solvent for 4 hours, the dodecyl trimethyl ammonium bromide can form holes on the layers of the nano kaolin, and finally, the modified kaolin is prepared, and has large interlayer spacing and holes and excellent adsorption performance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (5)
1. The environment-friendly adsorbent for aluminum ions in concentrated alkaline water is characterized by being prepared from the following raw materials in parts by weight: 35-50 parts of modified kaolin, 10-20 parts of calcium oxide, 3-5 parts of montmorillonite, 5-10 parts of graphene oxide, 100 parts of deionized water, 1-3 parts of acetic acid, 1-3 parts of chitosan and 0.5-1 part of reducing agent;
the environment-friendly adsorbent is prepared by the following method:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding a reducing agent into the mixed solution D, uniformly stirring at a rotating speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75-80 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
2. The environment-friendly adsorbent for aluminum ions in concentrated alkaline water as claimed in claim 1, wherein the modified kaolin is prepared by the following method:
step S1, mixing kaolin and potassium acetate uniformly according to a weight ratio of 1: 1, adding deionized water for mixing, carrying out mild grinding for 30min, standing for 20h, drying in a 55-60 ℃ water bath for 10h to obtain treated kaolin, adding the treated kaolin into a hydrochloric acid solution with the mass fraction of 10%, carrying out magnetic stirring for 20min at a rotating speed of 120r/min, carrying out suction filtration, washing with absolute ethyl alcohol for three times, transferring to a 55-60 ℃ drying box, and drying for 20h to obtain a compound A;
step S2, adding the compound A, dimethyl sulfoxide and deionized water into a three-neck flask, heating in a water bath at 55-60 ℃, uniformly stirring for 10 hours, performing suction filtration, washing for three times with absolute ethyl alcohol, drying for 10 hours at 70 ℃ to obtain a compound B, dispersing the compound B in methanol, performing ultrasonic treatment for 4 hours, taking out and transferring the compound B into a reaction kettle with a polytetrafluoroethylene lining, reacting for 10 hours at 130-140 ℃, washing for three times with absolute ethyl alcohol, and drying to obtain nano kaolin, wherein the weight ratio of the compound A, the dimethyl sulfoxide and the deionized water is controlled to be 1: 10: 1;
and step S3, adding the prepared nano kaolin into a mixed solvent, performing ultrasonic treatment for 4 hours, then adding dodecyl trimethyl ammonium bromide, performing uniform stirring and ultrasonic treatment for 4 hours, performing suction filtration, washing with absolute ethyl alcohol for three times, and drying to prepare the modified kaolin, wherein the weight ratio of the nano kaolin to the mixed solvent to the dodecyl trimethyl ammonium bromide is controlled to be 1: 50: 0.01.
3. The environment-friendly adsorbent for aluminum ions in concentrated alkaline water as claimed in claim 2, wherein in step S1, the weight ratio of kaolin to deionized water is controlled to 10: 1, and the mass ratio of the treated kaolin to 10% by mass of hydrochloric acid solution is 1: 50.
4. The environment-friendly adsorbent for aluminum ions in concentrated alkaline water as claimed in claim 2, wherein the reducing agent is one or two of VC and sodium borohydride mixed according to any proportion.
5. The preparation method of the environment-friendly adsorbent for aluminum ions in concentrated alkaline water as claimed in claim 1, characterized by comprising the following steps:
step one, adding modified kaolin, montmorillonite and graphene oxide into deionized water, uniformly stirring to prepare a suspension C, sequentially adding acetic acid and chitosan, and continuously stirring at a constant speed until the suspension C is viscous to prepare a mixed solution D;
and secondly, adding a reducing agent into the mixed solution D, uniformly stirring at a rotating speed of 100r/min until the reducing agent is uniformly dispersed, transferring to 75-80 ℃ for drying until mixture powder is formed, adding calcium oxide, and uniformly mixing to obtain the environment-friendly adsorbent for recovering concentrated alkaline water.
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| CN112844327A (en) * | 2020-12-22 | 2021-05-28 | 利晟（杭州）科技有限公司 | Sewage treatment adsorbent and preparation method thereof |
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Application publication date: 20201204 |