CN113042006A - Preparation method and application of chitosan magnetic adsorbent wrapped by biomimetic polymer - Google Patents
Preparation method and application of chitosan magnetic adsorbent wrapped by biomimetic polymer Download PDFInfo
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Abstract
The invention discloses a preparation method of a chitosan magnetic adsorbent wrapped by a biomimetic polymer. Dispersing magnetic chitosan particles (FCS) in Tris (Tris-HCl) buffer solution, adding dopamine hydrochloride (PDA) with different proportions, stirring at a certain rotation speed for a certain time, washing with absolute ethyl alcohol and deionized water for several times, and drying. The pH value of the Tris-HCl buffer solution is 8.5, and the mass-volume ratio of the magnetic chitosan microspheres to the Tris-HCl buffer solution is 1 mg: 1mL, wherein the mass ratio of the magnetic chitosan microspheres to the dopamine hydrochloride is 4: 1-9, and stirring for 1-5 h. The invention utilizes mussel bionics, and forms polydopamine with extremely strong adhesion force to be coated on the surface of the magnetic chitosan matrix through the oxidative auto-polymerization of the dopamine. The prepared adsorbing material has excellent adsorption capacity, strong stability and easy separation and recovery. The chitosan magnetic adsorbent wrapped by the biomimetic polymer is applied to removing cationic heavy metals and anionic heavy metals in water.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a preparation method and application of a chitosan magnetic adsorbent wrapped by a biomimetic polymer.
Background
In recent years, with the development of industry and the increase of activities of human beings, industrial wastewater and municipal domestic sewage containing a large amount of heavy metal pollutants are discharged into rivers and lakes. The amount of toxic heavy metals discharged into the environment in the world is up to millions of tons every year, wherein arsenic is 12.5 million tons, chromium is 3.9 million tons, copper is 14.7 million tons, mercury is 1.2 million tons, lead is 34.6 million tons, and nickel is 38.1 million tons, and the trend of year-by-year increase is shown. Heavy metals can denature biological proteins and affect physiological functions of human bodies and animals, the heavy metals can pollute soil and water and cause harm to animals and plants, the heavy metals can be continuously enriched in a food chain, the concentration is gradually increased, the toxicity has long-term property, and the human health is finally affected. In addition, the discharge standard requirements for heavy metal wastewater are becoming more and more strict, and how to effectively treat water pollution caused by heavy metals and try to recycle valuable metals is becoming an urgent problem to be solved.
At present, the common methods for treating heavy metals in water include chemical precipitation, electrolysis, ion exchange, membrane separation, evaporation concentration, adsorption, and oxidation-reduction, among which the adsorption-removal method is widely used because of its low cost, simple process and high efficiency. The chitosan is rich in amino and hydroxyl, is a natural aminopolysaccharide, has biodegradability, biocompatibility and bioadhesion, and is an excellent adsorption material. However, the use of chitosan is severely limited by the disadvantages of poor stability, low mechanical strength, limited number of functional groups, difficulty in separation and recovery after use, and the like, which are caused by the dissolution of chitosan under acidic conditions. In recent years, modification of chitosan has been carried outAre being studied quite extensively. Among them, the research on magnetic chitosan is relatively extensive. Due to the introduction of Fe with magnetism3O4Not only enhances the stability of chitosan, but also is due to Fe3O4Has magnetism, and can realize rapid separation.
But the number of chitosan active groups can be greatly reduced after the chitosan is crosslinked, so that the adsorption performance of heavy metal ions is reduced, and organic functional groups can be added on the magnetic chitosan microspheres through secondary reaction.
Mussels are a common marine organism, and can still be stably attached to the surfaces of solids such as reefs, woods and the like in a high-salinity and high-pH seawater environment. In 1983, the fact that the specific adhesion characteristics of mussel byssus are mainly derived from L-DOPA (L-DOPA) and lysine residues is discovered by white through the research on the adhesion performance of mussel byssus discs. In 2007, Messersmith et al firstly prepared a polydopamine coating with super-strong adhesion performance by utilizing a reaction mechanism that dopamine undergoes oxidative auto-polymerization in an oxygen-containing weak alkaline aqueous solution. Therefore, the dopamine biomimetic modification technology develops towards diversification and is widely applied to the fields of biological medicines, energy sources, functional materials and the like. In recent years, in the environmental field, interface modification of a substrate material by utilizing rich functional groups of dopamine and the characteristics of a strong adhesion coating gradually becomes one of the important research fields, and deep adsorption and catalytic oxidation of heavy metals in water can be realized through modification, so that the method is applied to purification and restoration of polluted water bodies.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a chitosan magnetic adsorbent wrapped by a biomimetic polymer, which not only solves the problem that the number of active groups of chitosan is reduced after the existing chitosan is crosslinked, but also provides strong adhesiveness.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a chitosan magnetic adsorbent wrapped by a bionic polymer comprises the steps of uniformly dispersing magnetic chitosan microspheres in Tris (Tris-HCl) buffer solution, shaking uniformly, adding a certain mass ratio of dopamine hydrochloride (PDA) into the solution for reaction, then washing with absolute ethyl alcohol and deionized water in sequence, and drying to obtain the bionic polymer wrapped magnetic biopolymer adsorbing material.
Preferably, the magnetic chitosan microspheres are prepared by mixing the following components in a mass-volume ratio of 1 mg: 1mL of the dispersion was dispersed in Tris (Tris-HCl buffer). In order to create a liquid environment for the bionic wrapping reaction, the sufficient contact space mass volume ratio of the dopamine hydrochloride and the magnetic chitosan microspheres is too large or too small, so that the contact is not uniform or insufficient, and the adsorption effect is unstable.
Preferably, the pH value of the Tris (Tris-HCl buffer) is adjusted to 8.5 to create a good pH environment for the biomimetic encapsulation reaction.
Preferably, the mass ratio of the dopamine hydrochloride to the magnetic chitosan is PDA: CS ═ 1: 4. 2: 4. 3: 4. 4: 4. 5: 4. 6: 4. 7: 4. 8: 4. 9: 4. the quantity of the polymerized monomers determines the polymerization rate, the quantity of the monomers is small, the polymerization rate is low, the adsorption reaction effect is poor, the modification purpose cannot be achieved, the quantity of the monomers is large, the self-polymerization reaction is easy to occur, and the wrapping quantity is reduced on the contrary, so that the adsorption effect is influenced.
Preferably, the reaction time is 2-4 h. The polymerization reaction time is too long, which affects the rate of polymerization and lowers the rate of polymerization.
Preferably, the preparation method of the magnetic chitosan microsphere comprises the step of uniformly dispersing magnetic nanoparticles into a chitosan solution with the mass concentration of 0.035 g-0.045 g/mL, wherein the magnetic Fe is3O4The mass ratio of the nanoparticles to the chitosan was 0.3 g: 0.6 g. And then dropwise adding the chitosan solution into a mixed solution of cyclohexane and span 80, uniformly mixing, adding glutaraldehyde into the mixed solution, and performing crosslinking reaction at 30-70 ℃ to obtain the magnetic chitosan microspheres.
Preferably, the mass ratio of the volume of cyclohexane to the chitosan is 76 mL: 0.6g, wherein the mass ratio of the volume of span 80 to the chitosan is 0.5 mL: 0.6 g. Too much or too little cyclohexane and span can result in non-uniform microspheres. Preferably, the mass ratio of the volume of glutaraldehyde to chitosan is 0.38 mL: 0.6g, and the crosslinking reaction time is 1-4 h.
The adsorbent prepared by the method can be used for heavy metal ion Cu2+、CrO4 2-And (3) treating the polluted water body, after adsorption is finished, separation can be realized through an external magnetic field, desorption can be performed under an alkaline condition, and the desorbed adsorbent can still be used for adsorbing heavy metal wastewater.
Compared with the prior art, the invention has the following beneficial effects:
(1) the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the invention has strong surface adhesion and adhesiveness, rich active sites, large adsorption capacity on heavy metal wastewater, high adsorption rate, and far higher adsorption capacity and adsorption rate than chitosan magnetic particles, thereby greatly improving the adsorption performance of the chitosan magnetic particles.
(2) The chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the invention has amphipathy and has good adsorption capacity on cationic heavy metal copper and anionic heavy metal chromium.
(3) The chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the invention has the advantages of uniform size, regular appearance, easy biodegradation in the environment, easy recovery, recycling, good adsorption effect after multiple adsorption and desorption, and realization of the regeneration and utilization of the adsorbent.
(4) The invention solves the problem that the number of active groups is reduced after chitosan and ferroferric oxide are crosslinked. Dopamine forms polydopamine with extremely strong adhesion through oxidative self-polymerization, the polydopamine is coated on the surfaces of various matrixes, functional groups such as amino, imino, catechol and the like exist on the surfaces of the matrixes modified by the dopamine, and the functional groups can perform Michael addition reaction and Schiff base reaction in a proper solution environment, so that the complexing ability and the reducing ability of the matrix material are improved, and more adsorption sites are provided.
Drawings
FIG. 1 is the PDA-Fe prepared in example 13O4Scanning electron micrographs of @ CS;
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Magnetic Fe used in examples of the present invention3O4The particle size of the nano-particles is 20-80 nm.
Example 1:
the preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer comprises the following steps:
(1) preparation of magnetic chitosan microsphere
Firstly, 0.6g of chitosan is dissolved in 15mL of acetic acid with the mass fraction of 1%, the mixture is stirred for 3 hours at the speed of 600 revolutions, 0.3g of magnetic ferroferric oxide nano particles are added after the stirring is finished, and the mixture and the magnetic ferroferric oxide nano particles are mixed and continuously stirred for 0.5 hour to obtain uniformly mixed dispersion liquid. Second, 76mL of cyclohexane was taken in a 250mL three-necked flask, and 0.5mL of span 80 was added with vigorous stirring and stirring was continued for 0.5 hour until it became milky white. And finally, under the constant stirring state, adding the dispersion liquid obtained in the first step into a three-neck flask at a uniform speed, stirring for 6 hours at 25 ℃, then adding 0.38mL of glutaraldehyde solution with the mass fraction of 50%, heating to 50 ℃, and stirring for 1 hour to obtain the magnetic chitosan microspheres. Finally, FCS was obtained with the aid of a magnet, washed several times with absolute ethanol and deionized water, and then dried under vacuum at 50 ℃.
(2) Preparation of chitosan magnetic adsorbent wrapped by biomimetic polymer
Dispersing 40mg of the prepared magnetic chitosan microspheres in 40mL of Tris (hydroxymethyl) aminomethane (Tris-HCl buffer), wherein the mass ratio of the added dopamine hydrochloride to the magnetic chitosan is 1: 4, reacting for 2 hours under the condition of 300r to prepare the chitosan magnetic adsorbent wrapped by the biomimetic polymer.
(3) For Cu2+Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into the magnetic adsorbent containing Cu at the concentration of 0.5g/L2+In the aqueous solution (50mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs Cu in the water body2+The case (1). Cu-coated chitosan magnetic adsorbent pair coated by bionic polymer after adhesion2+The maximum adsorption capacity of the adsorbent can reach 12.5 mg/g.
(4) For CrO4 2-Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into a mixture containing CrO at a ratio of 0.5g/L4 2-In the water solution (100mg/L), shaking for 24h, and determining that the bionic polymer coated chitosan magnetic adsorbent adsorbs CrO in the water body after being pasted4 2-The case (1). Chitosan magnetic adsorbent pair CrO coated with adhered bionic polymer4 2-The maximum adsorption capacity of the adsorbent can reach 114.88 mg/g.
Example 2
The preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer comprises the following steps:
(1) the magnetic chitosan microspheres were prepared according to the same method as in example 1.
(2) Preparation of chitosan magnetic adsorbent wrapped by biomimetic polymer
Dispersing 40mg of the prepared magnetic chitosan microspheres in 40mL of Tris (hydroxymethyl) aminomethane (Tris-HCl buffer), wherein the mass ratio of the added dopamine hydrochloride to the magnetic chitosan is 1: 2, reacting for 2h under the condition of 300r to prepare the chitosan magnetic adsorbent wrapped by the biomimetic polymer.
(3) For Cu2+Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into the magnetic adsorbent containing Cu at the concentration of 0.5g/L2+In the aqueous solution (50mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs Cu in the water body2+The case (1). Cu-coated chitosan magnetic adsorbent pair by polymerized bionic polymer2+The maximum adsorption capacity of the adsorbent can reach 15 mg/g.
(4) For CrO4 2-Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into a mixture containing CrO at a ratio of 0.5g/L4 2-In the aqueous solution (100mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs CrO in water4 2-The case (1). Chitosan magnetic adsorbent pair CrO coated by polymerized bionic polymer4 2-The maximum adsorption capacity of the adsorbent can reach 109.77 mg/g.
(5) In this example, the ratio of polymer dopamine hydrochloride to magnetic chitosan microspheres was increased, and in comparative example, Cu was added2+The adsorption capacity of (A) is increased, which indicates that the polymerization rate of the polymer is increased and the adsorption capacity is also increased, and for CrO in the comparative example4 2-The adsorption capacity of (A) is reduced, which means that the polymerization rate is reduced due to excessive addition, and the adsorption effect is influenced.
Example 3
The preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer comprises the following steps:
(1) the magnetic chitosan microspheres were prepared according to the same method as in example 1.
(2) Preparation of chitosan magnetic adsorbent wrapped by biomimetic polymer
The preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer comprises the following steps:
(1) the magnetic chitosan microspheres were prepared according to the same method as in example 1.
(2) Preparation of chitosan magnetic adsorbent wrapped by biomimetic polymer
Dispersing 40mg of the prepared magnetic chitosan microspheres in 40mL of Tris (hydroxymethyl) aminomethane (Tris-HCl buffer), wherein the mass ratio of the added dopamine hydrochloride to the magnetic chitosan is 3: 4, reacting for 2 hours under the condition of 300r to prepare the chitosan magnetic adsorbent wrapped by the biomimetic polymer.
(3) For Cu2+Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into the magnetic adsorbent containing Cu at the concentration of 0.5g/L2+In the aqueous solution (50mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs Cu in the water body2+The case (1). Cu-coated chitosan magnetic adsorbent pair coated by bionic polymer after adhesion2+The maximum adsorption capacity of the adsorbent can reach 17.5 mg/g.
(4) For CrO4 2-Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into a mixture containing CrO at a ratio of 0.5g/L4 2-In an aqueous solution of (A), (B)100mg/L), shaking for 24h, and determining that the polymerized chitosan magnetic adsorbent wrapped by the biomimetic polymer adsorbs CrO in water4 2-The case (1). Chitosan magnetic adsorbent pair CrO coated by polymerized bionic polymer4 2-The maximum adsorption capacity of the adsorbent can reach 105.8 mg/g.
(5) In this example, the ratio of polymer dopamine hydrochloride to magnetic chitosan microspheres was increased, and in comparative example, Cu was added2+Continues to increase the adsorption capacity to CrO4 2-Continues to decrease in adsorption capacity.
Example 4
The preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer comprises the following steps:
(1) the magnetic chitosan microspheres were prepared according to the same method as in example 1.
(2) Preparation of chitosan magnetic adsorbent wrapped by biomimetic polymer
Dispersing 40mg of the prepared magnetic chitosan microspheres in 40mL of Tris (hydroxymethyl) aminomethane (Tris-HCl buffer), wherein the mass ratio of the added dopamine hydrochloride to the magnetic chitosan is 5: 4, reacting for 2 hours under the condition of 300r to prepare the chitosan magnetic adsorbent wrapped by the biomimetic polymer.
(3) For Cu2+Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into the magnetic adsorbent containing Cu at the concentration of 0.5g/L2+In the aqueous solution (50mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs Cu in the water body2+The case (1). Cu-coated chitosan magnetic adsorbent pair coated by bionic polymer after adhesion2+The maximum adsorption capacity of the adsorbent can reach 25 mg/g.
(4) For CrO4 2-Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into a mixture containing CrO at a ratio of 0.5g/L4 2-In the aqueous solution (100mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs CrO in water4 2-The case (1). Chitosan magnetic adsorbent pair C coated with polymerized bionic polymerrO4 2-The maximum adsorption capacity of the adsorbent can reach 98.2 mg/g.
(5) In this example, the ratio of polymer dopamine hydrochloride to magnetic chitosan microspheres was increased, and in comparative example, Cu was added2+Continues to increase the adsorption capacity to CrO4 2-Continues to decrease in adsorption capacity.
Example 5
The preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer comprises the following steps:
(1) the magnetic chitosan microspheres were prepared according to the same method as in example 1.
(2) Preparation of chitosan magnetic adsorbent wrapped by biomimetic polymer
Dispersing 40mg of the prepared magnetic chitosan microspheres in 40mL of Tris (hydroxymethyl) aminomethane (Tris-HCl buffer), wherein the mass ratio of the added dopamine hydrochloride to the magnetic chitosan is 3: 2, reacting for 2h under the condition of 300r to prepare the chitosan magnetic adsorbent wrapped by the biomimetic polymer.
(3) For Cu2+Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into the magnetic adsorbent containing Cu at the concentration of 0.5g/L2+In the aqueous solution (50mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs Cu in the water body2+The case (1). Cu-coated chitosan magnetic adsorbent pair by polymerized bionic polymer2+The highest adsorption capacity can reach 47.5 mg/g.
(4) For CrO4 2-Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into a mixture containing CrO at a ratio of 0.5g/L4 2-In the aqueous solution (100mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs CrO in water4 2-The case (1). Chitosan magnetic adsorbent pair CrO coated by polymerized bionic polymer4 2-The maximum adsorption capacity of the adsorbent can reach 88 mg/g.
(5) In this example, the ratio of polymer dopamine hydrochloride to magnetic chitosan microspheres was increased, and in the comparative exampleFor Cu2+Continues to increase the adsorption capacity to CrO4 2-Continues to decrease in adsorption capacity.
Example 6
The preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer comprises the following steps:
(1) the magnetic chitosan microspheres were prepared according to the same method as in example 1.
(2) Preparation of chitosan magnetic adsorbent wrapped by biomimetic polymer
Dispersing 40mg of the prepared magnetic chitosan microspheres in 40mL of Tris (hydroxymethyl) aminomethane (Tris-HCl buffer), wherein the mass ratio of the added dopamine hydrochloride to the magnetic chitosan is 7: 4, reacting for 2 hours under the condition of 300r to prepare the chitosan magnetic adsorbent wrapped by the biomimetic polymer.
(3) For Cu2+Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into the magnetic adsorbent containing Cu at the concentration of 0.5g/L2+In the aqueous solution (50mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs Cu in the water body2+The case (1). Cu-coated chitosan magnetic adsorbent pair by polymerized bionic polymer2+The maximum adsorption capacity of the adsorbent can reach 45 mg/g.
(4) For CrO4 2-Adsorption application of the solution: adding the chitosan magnetic adsorbent wrapped by the bionic polymer prepared by the method into a mixture containing CrO at a ratio of 0.5g/L4 2-In the aqueous solution (100mg/L), shaking for 24h, and determining that the polymerized bionic polymer coated chitosan magnetic adsorbent adsorbs CrO in water4 2-The case (1). Chitosan magnetic adsorbent pair CrO coated by polymerized bionic polymer4 2-The maximum adsorption capacity of the adsorbent can reach 91.88 mg/g.
(5) In this example, the ratio of polymer dopamine hydrochloride to magnetic chitosan microspheres was increased, and in comparative example, Cu was added2+The adsorption capacity is reduced, which indicates that the excessive addition of the PDA reduces the polymerization rate and influences the adsorption effect; for CrO4 2-Continues to decrease in adsorption capacity.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (10)
1. A preparation method of a chitosan magnetic adsorbent wrapped by a biomimetic polymer is characterized in that magnetic chitosan microspheres are prepared by mixing the following components in a mass-volume ratio of 1 mg: dispersing 1mL of the magnetic chitosan adsorbent in trihydroxymethyl aminomethane (Tris-HCl buffer solution), shaking up, adding dopamine hydrochloride (PDA) with a certain mass ratio into the solution to react for a certain time, then sequentially washing with absolute ethyl alcohol and deionized water, and drying to obtain the magnetic chitosan adsorbent wrapped by polydopamine.
2. The preparation method of the magnetic chitosan microsphere comprises the following steps: magnetic Fe3O4The nano particles are uniformly dispersed in a chitosan solution with the mass concentration of 0.035 g-0.045 g/ml, wherein the mass ratio of the magnetic nano particles to the chitosan is 1: and 2, dropwise adding the chitosan solution into a mixed solution of cyclohexane and span 80, uniformly mixing, adding a cross-linking agent glutaraldehyde into the mixed solution, and rapidly stirring and reacting for a period of time to obtain the black magnetic chitosan microspheres with uniform sizes.
3. The method for preparing a chitosan magnetic adsorbent wrapped by biomimetic polymer according to claim 1, wherein the magnetic chitosan microsphere is prepared by mixing the following components in a mass-to-volume ratio of 1 mg: 1mL of the dispersion was dispersed in Tris (Tris-HCl buffer).
4. A method for preparing a biomimetic polymer-coated chitosan magnetic adsorbent according to claim 1, wherein the Tris (Tris-HCl buffer) is a 20mM solution with a pH of 8.5.
5. The preparation method of the chitosan magnetic adsorbent wrapped by the biomimetic polymer according to claim 1, wherein the mass ratio of dopamine hydrochloride to magnetic chitosan is 1-9: 4.
6. the method for preparing a chitosan magnetic adsorbent wrapped by a biomimetic polymer according to claim 1, wherein the sticking reaction rotating speed of dopamine hydrochloride and magnetic chitosan is 250-350 r.
7. The method for preparing a chitosan magnetic adsorbent wrapped by a biomimetic polymer according to claim 1, wherein the reaction time of dopamine hydrochloride and magnetic chitosan is 1-5 h.
8. The method for preparing a magnetic chitosan adsorbent according to claim 1, wherein the mass ratio of the volume of cyclohexane to the chitosan is 76 mL: 0.6g, wherein the mass ratio of the volume of span 80 to the chitosan is 0.5 mL: 0.6g, and the crosslinking reaction time is 2-5 h.
9. A chitosan magnetic adsorbent wrapped by a biomimetic polymer is applied to removing cationic heavy metals and anionic heavy metals in water. The cationic heavy metals include, but are not limited to, copper ions and the anionic heavy metals include, but are not limited to, hexavalent chromium ions.
10. The application of the chitosan magnetic adsorbent wrapped by the biomimetic polymer according to claim 9, wherein an adsorbing material is added into a solution containing heavy metals, and the solution is subjected to oscillation reaction for 5-48 hours in a constant-temperature water bath oscillator with the temperature of 20-50 ℃ to adsorb and remove the heavy metals in the solution.
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