CN112892486A - Preparation method of inorganic heavy metal waste liquid adsorption material, adsorption material and application - Google Patents
Preparation method of inorganic heavy metal waste liquid adsorption material, adsorption material and application Download PDFInfo
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Abstract
The invention provides a preparation method of an inorganic heavy metal waste liquid adsorbing material, the adsorbing material and application, and solves the technical problems that the adsorbing material for adsorbing heavy metal in inorganic heavy metal waste liquid in the prior art has poor adsorption capacity, low reuse rate and high production cost. The preparation method comprises the following steps: (1) preparing a trihydroxymethyl aminomethane buffer solution; (2) preparing a dopamine hydrochloride solution; (3) prewetting the settled and attached substrate with absolute ethyl alcohol; (4) a dopamine hydrochloride solution configured to add a catalyst; (5) mixing, stirring and reacting the dopamine hydrochloride solution added with the catalyst and the pre-wetted settlement adhering base material; (6) and washing and drying the sedimentation attachment base material to obtain the inorganic heavy metal waste liquid adsorption material. The preparation method of the inorganic heavy metal waste liquid adsorption material has the advantages of simple preparation method, mild conditions, low cost, strong operability, good repeatability and stable performance.
Description
Technical Field
The invention relates to an adsorption material, and in particular relates to a preparation method of an inorganic heavy metal waste liquid adsorption material, the adsorption material and application.
Background
The problem of heavy metal pollution of water bodies in China is increasingly serious, and waste liquid with over-standard content of heavy metal ions such as mercury (Hg), chromium (Cr), cadmium (Cd), lead (Pb), copper (Cu), manganese (Mn) and the like enters organisms through water bodies, soil, food chains and the like and is continuously enriched, so that serious harm is caused to human health and social development. The harmful substances such as heavy metals in the inorganic waste liquid far exceed the discharge standard, and along with the development of scientific research, the inorganic waste liquid containing the harmful substances such as heavy metals is more and more, and the search for a proper treatment method is urgent. In 2015, the 'action plan for preventing and treating water pollution' is promulgated and started formally in China, and the strategic stage of the treatment of the water pollution problem in China is marked. How to reduce and eliminate heavy metal ion pollution is an important problem facing the present society. Therefore, there is a need for a low cost, high efficiency water treatment process. The existing waste liquid treatment methods mainly comprise an evaporation method, an ion exchange method, a reduction precipitation method, a membrane filtration method, a solvent extraction method, a microorganism reduction method, a plant restoration method, an adsorption method and the like. Among them, the adsorption method is simple to operate, inexpensive, easy to desorb, and efficient, and is considered to be the most valuable method. The main operating point for adsorption is to select or manufacture a low-cost, environmentally friendly, highly efficient and highly stable adsorbent material. At present, activated carbon, chitosan, clay, montmorillonite, zeolite, vermiculite have been reported as conventional adsorbing materials. But the application of the catalyst is limited by poor adsorption capacity, low recycling rate, high cost and poor selectivity. Therefore, the development of high adsorption capacity and low production price adsorbent materials remains a long and arduous task.
The applicant has found that the prior art has at least the following technical problems:
the adsorption material for adsorbing heavy metal in inorganic heavy metal waste liquid in the prior art has the technical problems of poor adsorption capacity, low reuse rate and high production cost.
Disclosure of Invention
The invention aims to provide a preparation method of an inorganic heavy metal waste liquid adsorbing material, the adsorbing material and application, and aims to solve the technical problems that the adsorbing material for adsorbing heavy metal in inorganic heavy metal waste liquid in the prior art has poor adsorption capacity, low reuse rate and high production cost. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a preparation method of an inorganic heavy metal waste liquid adsorbing material, which comprises the following steps:
(1) dissolving tris (hydroxymethyl) aminomethane in water, adjusting the pH value to 7.5-9.5, and preparing tris (hydroxymethyl) aminomethane buffer solution;
(2) dissolving dopamine hydrochloride in the trihydroxymethyl aminomethane buffer solution prepared in the step (1) to prepare dopamine hydrochloride mixed solution;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) dissolving copper sulfate and hydrogen peroxide serving as catalysts in the dopamine hydrochloride mixed solution prepared in the step (2) to prepare a dopamine hydrochloride mixed solution added with the catalysts;
(5) mixing, stirring and reacting the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with the precipitation adhering base material pre-wetted in the step (3);
(6) and (5) after the mixing and stirring reaction in the step (5) is finished, filtering, and washing and drying the sedimentation attachment base material obtained after filtering to obtain the inorganic heavy metal waste liquid adsorbing material.
Further, in the step (1), the prepared tris buffer solution has a concentration of 30-70 mmol/L.
Further, in the step (1), the agent for adjusting the pH when preparing the tris buffer solution is a sodium hydroxide solution, a potassium hydroxide solution, a hydrochloric acid solution, or a sulfuric acid solution.
Further, in the step (2), the concentration of the prepared dopamine hydrochloride mixed solution is 1-4 mg/ml.
Further, in the step (3), the sedimentation adhering base material is any one or a mixture of any more of activated carbon, cement-based porous material, fly ash, floating beads, aerogel and ion exchange resin.
Further, in the step (4), the concentration of copper sulfate as a catalyst in the dopamine hydrochloride mixed solution is 3-7 mmol/L; the concentration of the hydrogen peroxide as a catalyst in the dopamine hydrochloride mixed solution is 15-25 mmol/L.
Further, in the step (5), the dopamine hydrochloride mixed solution added with the catalyst is mixed with the settlement adhering base material and stirred for reaction for 0.5-36 h.
Further, the water for preparing the tris buffer solution in the step (1) and the washing water in the step (6) are both deionized water; in the step (6), the drying method is vacuum drying and drying is carried out at the temperature of 30-50 ℃ for 4-24 h.
The invention provides an inorganic heavy metal waste liquid adsorbing material prepared by the preparation method.
The inorganic heavy metal waste liquid adsorbing material prepared by the preparation method provided by the invention is used for adsorbing heavy metal ions in the inorganic heavy metal waste liquid.
The adsorption mechanism of the inorganic heavy metal waste liquid adsorption material for adsorbing heavy metal ions in the inorganic heavy metal waste liquid provided by the invention is as follows:
dopamine hydrochloride, namely dopamine, 3-hydroxytyrosamine, catecholamines and 4- (2-aminoethyl) -1, 2-benzenediol hydrochloride; the metal ion adsorption material has two hydroxyl groups and one amino functional group, and can be chelated with heavy metal ions to form stable chelate precipitates, so that the metal ion adsorption material is prominent in the adsorption of metal ions.
Dopamine hydrochloride in combination with heavy metal ion Mn+When the stable chelate is produced by reaction, the coordination modes include but are not limited to the following three coordination modes (1), (2) and (3), and a plurality of coordination modes exist simultaneously, two hydroxyl groups and one amino functional group in dopamine can be combined with the metal ion Mn+Coordination chelation, the number of coordination is related to the valence state of the metal ion.
(1)
(2)
(3)
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) according to the preparation method of the inorganic heavy metal waste liquid adsorption material, in the process of preparing the inorganic heavy metal waste liquid adsorption material, dopamine hydrochloride and a sedimentation base material generate a phenomenon similar to 'gluing' and stably deposit on the surface of the base material, and when the heavy metal waste liquid is treated, the dopamine hydrochloride is chelated with heavy metal ions through a molecular formula structure (which has two hydroxyl groups and one amino functional group) of the dopamine hydrochloride to form stable chelate sediment, so that the heavy metal ions are adsorbed; the method has the characteristics of simple preparation method, mild conditions, low cost, strong operability, good repeatability, stable performance and no secondary pollution, can simplify the treatment process of inorganic waste liquid generated in laboratories and the like, can reduce the treatment cost, has low energy consumption in the treatment process, and meets the modern energy-saving and environment-friendly requirement.
(2) The inorganic heavy metal waste liquid adsorption material provided by the invention is used for treating inorganic heavy metal waste liquid harmful to the environment, and is very beneficial to relieving the water pollution pressure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
First, preparation example:
example 1:
preparation of inorganic heavy metal waste liquid adsorption material
The sedimentation adhering base material in this embodiment is activated carbon, and the preparation method thereof includes the following steps:
(1) adding 3.63g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the beaker, and adjusting the pH value to 8.5 by using 2mol/L sulfuric acid solution to obtain tris (hydroxymethyl) aminomethane buffer solution;
(2) adding 2g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) adding 0.76g of copper sulfate and 1.7g of 30% hydrogen peroxide solution by mass into the dopamine hydrochloride mixed solution prepared in the step (2) to dissolve the copper sulfate and the 1.7g of 30% hydrogen peroxide solution to obtain a catalyst-added dopamine hydrochloride mixed solution;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3), and reacting for 4 hours;
(6) and (5) after the mixing, stirring and reacting are finished in the step (5), filtering, washing the obtained sedimentation adhesion base material after filtering for 8 hours by using ultrapure water, and finally drying in vacuum at the temperature of 30 ℃ for 4 hours to obtain the inorganic heavy metal waste liquid adsorbing material.
Example 2:
preparation of inorganic heavy metal waste liquid adsorption material
The sedimentation adhering base material in this embodiment is activated carbon, and the preparation method thereof includes the following steps:
(1) adding 3.63g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the beaker, and adjusting the pH value to 8.5 by using 2mol/L sulfuric acid solution to obtain tris (hydroxymethyl) aminomethane buffer solution;
(2) adding 2g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) adding 1.26g of copper sulfate and 2.22g of 30% hydrogen peroxide into the dopamine hydrochloride mixed solution prepared in the step (2) to dissolve, so as to obtain a catalyst-added dopamine hydrochloride mixed solution;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3), reacting for 2h,
(6) and (3) after the mixing, stirring and reacting in the step (5) are finished, filtering, washing the obtained sedimentation adhesion base material after filtering by using ultrapure water for 8h, and finally drying in vacuum at the temperature of 40 ℃ for 5h to obtain the inorganic heavy metal waste liquid adsorbing material.
Example 3:
preparation of inorganic heavy metal waste liquid adsorption material
The sedimentation adhesion substrate in this example was a floating bead (20 mesh), and the preparation method thereof included the following steps:
(1) adding 3.63g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the beaker, and adjusting the pH value to 8.5 by using 2mol/L sulfuric acid solution to obtain tris (hydroxymethyl) aminomethane buffer solution;
(2) adding 2g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) adding 0.76g of copper sulfate and 1.7g of 30% hydrogen peroxide solution by mass into the dopamine hydrochloride mixed solution prepared in the step (2) to dissolve the copper sulfate and the 1.7g of 30% hydrogen peroxide solution to obtain a catalyst-added dopamine hydrochloride mixed solution;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3), reacting for 4 hours,
(6) and (5) after the mixing, stirring and reacting are finished in the step (5), filtering, washing the obtained sedimentation adhesion base material after filtering by using ultrapure water for 8h, and finally drying in vacuum at the temperature of 30 ℃ for 24h to obtain the inorganic heavy metal waste liquid adsorbing material.
Example 4:
preparation of inorganic heavy metal waste liquid adsorption material
The sedimentation adhesion substrate in this example was a floating bead (20 mesh), and the preparation method thereof included the following steps:
(1) adding 3.63g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the beaker, and adjusting the pH value to 8.5 by using 2mol/L sulfuric acid solution to obtain tris (hydroxymethyl) aminomethane buffer solution;
(2) adding 2g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) adding 1.26g of copper sulfate and 2.22g of 30% hydrogen peroxide into the dopamine hydrochloride mixed solution prepared in the step (2) to dissolve, so as to obtain a catalyst-added dopamine hydrochloride mixed solution;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3), reacting for 2h,
(6) and (5) after the mixing, stirring and reacting are finished in the step (5), filtering, washing the obtained sedimentation adhesion base material after filtering by using ultrapure water for 8h, and finally drying in vacuum at the temperature of 40 ℃ for 10h to obtain the inorganic heavy metal waste liquid adsorbing material.
Example 5:
preparation of inorganic heavy metal waste liquid adsorption material
The settlement adhesion base material in the embodiment is made of a cement-based porous material, and the preparation method comprises the following steps:
(1) adding 8.48g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the beaker, and adjusting the pH value to 8.5 by using a 2mol/L sulfuric acid solution to obtain a tris (hydroxymethyl) aminomethane buffer solution with the concentration of 70 mmol/L;
(2) adding 1g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution;
wherein the concentration of the dopamine hydrochloride is 1 mg/ml;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) dissolving 0.48g of copper sulfate and 2.27g of dopamine hydrochloride mixed solution prepared in the step (2) of hydrogen peroxide with the mass concentration of 30% to obtain a catalyst-added dopamine hydrochloride mixed solution;
adding the catalyst into dopamine hydrochloride solution, wherein the concentration of copper sulfate is 3mmol/L, and the concentration of hydrogen peroxide is 20 mmol/L;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3) and reacting for 36 hours,
(6) and (3) after the mixing, stirring and reacting in the step (5) are finished, filtering, washing the obtained sedimentation adhesion base material after filtering by using ultrapure water for 8h, and finally drying in vacuum at the temperature of 35 ℃ for 20h to obtain the inorganic heavy metal waste liquid adsorbing material.
Example 6:
preparation of inorganic heavy metal waste liquid adsorption material
The sedimentation adhering base material in the embodiment is made of fly ash, and the preparation method comprises the following steps:
(1) adding 6.06g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the mixture, and adjusting the pH value to 8.5 by using a 2mol/L sulfuric acid solution to obtain a tris (hydroxymethyl) aminomethane buffer solution with the concentration of 50 mmol/L;
(2) adding 4g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution;
wherein the concentration of the dopamine hydrochloride is 4 mg/ml;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) adding 1.12g of copper sulfate and 2.83g of 30% hydrogen peroxide solution into the dopamine hydrochloride mixed solution prepared in the step (2) to dissolve, and obtaining a catalyst-added dopamine hydrochloride mixed solution;
adding the catalyst into dopamine hydrochloride mixed solution, wherein the concentration of copper sulfate is 7mmol/L, and the concentration of hydrogen peroxide is 25 mmol/L;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3) and reacting for 24 hours,
(6) and (5) after the mixing, stirring and reacting are finished in the step (5), filtering, washing the obtained sedimentation adhesion base material after filtering by using ultrapure water for 8h, and finally drying in vacuum at the temperature of 45 ℃ for 6h to obtain the inorganic heavy metal waste liquid adsorbing material.
Example 7:
preparation of inorganic heavy metal waste liquid adsorption material
The settlement attaching base material in this embodiment is aerogel, and the preparation method thereof includes the following steps:
(1) adding 7.27g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the beaker, and adjusting the pH value to 8.5 by using a 2mol/L sulfuric acid solution to obtain a tris (hydroxymethyl) aminomethane buffer solution with the concentration of 60 mmol/L;
(2) adding 3g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution;
wherein the concentration of the dopamine hydrochloride is 3 mg/ml;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) adding 0.96g of copper sulfate and 2.04g of 30% hydrogen peroxide solution by mass into the dopamine hydrochloride mixed solution prepared in the step (2) to dissolve the copper sulfate and the hydrogen peroxide solution to obtain a catalyst-added dopamine hydrochloride mixed solution;
adding a catalyst in dopamine hydrochloride mixed solution, wherein the concentration of copper sulfate is 6mmol/L, and the concentration of hydrogen peroxide is 18 mmol/L;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3) and reacting for 12h,
(6) and (5) after the mixing, stirring and reacting are finished in the step (5), filtering, washing the obtained sedimentation adhesion base material after filtering for 8 hours by using ultrapure water, and finally drying in vacuum at the temperature of 50 ℃ for 4 hours to obtain the inorganic heavy metal waste liquid adsorbing material.
Example 8:
preparation of inorganic heavy metal waste liquid adsorption material
The base material for deposition and adhesion in this example is a cationic ion exchange resin, and the preparation method thereof includes the following steps:
(1) adding 4.85g of tris (hydroxymethyl) aminomethane and 1000ml of ultrapure water into a 1500ml beaker, placing the beaker into an ultrasonic stirrer, stirring and dissolving the mixture, and adjusting the pH value to 8.5 by using a 2mol/L sulfuric acid solution to obtain a tris (hydroxymethyl) aminomethane buffer solution with the concentration of 40 mmol/L;
(2) adding 2.5g of dopamine hydrochloride into the trihydroxymethyl aminomethane buffer solution prepared in the step (1) for dissolving to obtain a dopamine hydrochloride mixed solution; wherein the concentration of the dopamine hydrochloride is 2.5 mg/ml;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) adding 0.96g of copper sulfate and 2.04g of 30% hydrogen peroxide solution by mass into the dopamine hydrochloride mixed solution prepared in the step (2) to dissolve the copper sulfate and the hydrogen peroxide solution to obtain a catalyst-added dopamine hydrochloride mixed solution;
adding a catalyst in dopamine hydrochloride mixed solution, wherein the concentration of copper sulfate is 6mmol/L, and the concentration of hydrogen peroxide is 18 mmol/L;
(5) mixing and stirring the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with 400g of the precipitation adhesion base material pre-wetted in the step (3) and reacting for 0.5h,
(6) and (5) after the mixing, stirring and reacting are finished in the step (5), filtering, washing the obtained sedimentation adhesion base material after filtering by using ultrapure water for 8h, and finally drying in vacuum at the temperature of 42 ℃ for 10h to obtain the inorganic heavy metal waste liquid adsorbing material.
Secondly, the inorganic heavy metal waste liquid adsorbing materials obtained in the examples 1 to 8 are subjected to a common heavy metal ion static adsorption experiment, and Cu ions are respectively carried out2+、Pb2+、Zn2+、Mn2+、Cd2+、Cr3+、Pb2+、Pb2+The adsorption of (a) was described as experiment example 1, experiment example 2, experiment example 3, experiment example 4, experiment example 5, experiment example 6, experiment example 7 and experiment example 8 in this order.
Marking the inorganic heavy metal waste liquid adsorbing materials obtained in the embodiments 1 to 8 as a sample 1, a sample 2, a sample 3, a sample 4, a sample 5, a sample 6, a sample 7 and a sample 8 respectively; the substrates used in examples 1 to 8 correspond to comparative examples;
experimental example 1:
1. first static adsorption experiment:
the operation method comprises the following steps: the solution to be treated (containing Cu) with a known concentration is measured2+) Pouring six 500ml portions into six conical flasks respectively, wherein the six conical flasks are divided into two groups, and one group is divided into three parts for parallel items; then the same mass (1g) of samples (sample 1, sample 2, sample 3, sample 4, sample 5, sample 6, sample 7 or sample 8) was added to a set of erlenmeyer flasks, respectively; the same mass (1g) of the dried base material as a comparative example was charged into each of the other set of erlenmeyer flasks, and then the two sets of erlenmeyer flasks were fixed in a constant temperature water bath oscillator whose temperature was set (room temperature 25 ℃ C.), and were sampled after shaking for 90 minutes at a shaking frequency of 120 r/min. Centrifuging the adsorbed solution, and determining the content of metal ions in the adsorbed solution by utilizing atomic absorption spectroscopy; the results are shown in table 1 below:
2. respectively carrying out recycling regeneration treatment on the sample 1, the sample 2, the sample 3, the sample 4, the sample 5, the sample 6, the sample 7 and the sample 8 which are subjected to the first static adsorption experiment to obtain regenerated samples, and then carrying out a second static adsorption experiment on the regenerated samples:
the specific steps of the sample (sample 1, sample 2, sample 3, sample 4, sample 5, sample 6, sample 7 and sample 8) recycling regeneration treatment are as follows:
(1) soaking the sample in 0.01mol/L hydrochloric acid for 5h, and desorbing;
(2) washing the desorbed sample for three times by using deionized water;
(3) and (4) drying the washed sample at the temperature of 30 ℃ for 10 hours in vacuum to obtain a regenerated sample.
Second static adsorption experiment:
the operation method comprises the following steps: the same as the first static adsorption experiment; the results are shown in table 1 below:
the experimental methods of experimental example 2, experimental example 3, experimental example 4, experimental example 5, experimental example 6, experimental example 7 and experimental example 8 are the same as experimental example 1, and the detection results are shown in the following table 1:
TABLE 1 static adsorption test results of inorganic heavy metal waste liquid adsorbing materials obtained in examples 1 to 8
As can be seen from table 1 above, the inorganic heavy metal waste liquid adsorbing material obtained in examples 1 to 8 has a good adsorption effect, and the regenerated sample subjected to regeneration and reuse treatment can also achieve a good adsorption effect.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A preparation method of an inorganic heavy metal waste liquid adsorption material is characterized by comprising the following steps: the preparation method comprises the following steps:
(1) dissolving tris (hydroxymethyl) aminomethane in water, adjusting the pH value to 7.5-9.5, and preparing tris (hydroxymethyl) aminomethane buffer solution;
(2) dissolving dopamine hydrochloride in the trihydroxymethyl aminomethane buffer solution prepared in the step (1) to prepare dopamine hydrochloride mixed solution;
(3) prewetting the settled and attached substrate with absolute ethyl alcohol;
(4) dissolving copper sulfate and hydrogen peroxide serving as catalysts in the dopamine hydrochloride mixed solution prepared in the step (2) to prepare a dopamine hydrochloride mixed solution added with the catalysts;
(5) mixing, stirring and reacting the dopamine hydrochloride mixed solution added with the catalyst and prepared in the step (4) with the precipitation adhering base material pre-wetted in the step (3);
(6) and (5) after the mixing and stirring reaction in the step (5) is finished, filtering, and washing and drying the sedimentation attachment base material obtained after filtering to obtain the inorganic heavy metal waste liquid adsorbing material.
2. The preparation method of the inorganic heavy metal waste liquid adsorbing material according to claim 1, characterized in that: in the step (1), the concentration of the prepared tris buffer solution is 30-70 mmol/L.
3. The preparation method of the inorganic heavy metal waste liquid adsorbing material according to claim 1, characterized in that: in the step (1), the agent for adjusting the pH value when preparing the tris buffer solution is a sodium hydroxide solution, a potassium hydroxide solution, a hydrochloric acid solution or a sulfuric acid solution.
4. The preparation method of the inorganic heavy metal waste liquid adsorbing material according to claim 1, characterized in that: in the step (2), the concentration of the prepared dopamine hydrochloride mixed solution is 1-4 mg/ml.
5. The preparation method of the inorganic heavy metal waste liquid adsorbing material according to claim 1, characterized in that: in the step (3), the sedimentation adhering base material is any one or a mixture of any more of activated carbon, cement-based porous materials, fly ash, floating beads, aerogel and ion exchange resin.
6. The preparation method of the inorganic heavy metal waste liquid adsorbing material according to claim 1, characterized in that: in the step (4), the concentration of copper sulfate as a catalyst in the dopamine hydrochloride mixed solution is 3-7 mmol/L; the concentration of the hydrogen peroxide as a catalyst in the dopamine hydrochloride mixed solution is 15-25 mmol/L.
7. The preparation method of the inorganic heavy metal waste liquid adsorbing material according to claim 1, characterized in that: in the step (5), the dopamine hydrochloride mixed solution added with the catalyst is mixed with the settlement adhering base material and stirred for reaction for 0.5-36 h.
8. The method for preparing an inorganic heavy metal waste liquid adsorbing material according to any one of claims 1 to 7, wherein: the water for preparing the tris buffer solution in the step (1) and the washing water in the step (6) are both deionized water; in the step (6), the drying method is vacuum drying and drying is carried out at the temperature of 30-50 ℃ for 4-24 h.
9. An inorganic heavy metal waste liquid adsorbing material prepared by the preparation method of any one of claims 1 to 8.
10. The inorganic heavy metal waste liquid adsorbing material prepared by the preparation method of any one of claims 1 to 8 is used for adsorbing heavy metal ions in inorganic heavy metal waste liquid.
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