CN113145086A - Fatty acid modified adsorption resin, preparation method and method for treating anionic surfactant wastewater by using same - Google Patents
Fatty acid modified adsorption resin, preparation method and method for treating anionic surfactant wastewater by using same Download PDFInfo
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Abstract
The invention discloses a fatty acid modified adsorption resin and a preparation method thereof, and the preparation method comprises the following steps: 1) carrying out suspension copolymerization on an aromatic polyvinyl monomer, an acrylate monomer and an unsaturated fatty acid monomer to obtain a fatty acid modified porous white ball; 2) and step 1), immersing the fatty acid modified porous white ball into a cation exchange solution to obtain the fatty acid modified adsorption resin. The resin is particularly suitable for adsorbing and recycling wastewater containing anionic surfactant, and the treated wastewater reaches the standard and is discharged, thereby providing a feasible solution for civil, industrial washing and bleaching and dyeing wastewater treatment.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a fatty acid modified adsorption resin and a preparation method thereof, and also relates to a method for treating wastewater, in particular to washing wastewater containing an anionic surfactant by using the resin.
Background
The anionic surfactant is the product with the largest yield and the largest variety among the surfactants. Among them, the straight chain sulfonic acid/sodium sulfate represented by sodium dodecylbenzene sulfonate, sodium dodecylsulfate, etc. is one of the most widely used washing and bleaching and dyeing reagents in civil and industrial fields, and has the advantages of good foamability, stable performance, low price, etc., and the yield of the straight chain sulfonic acid/sodium sulfate accounts for more than 90% of the total yield of the synthetic detergent. Meanwhile, the substances are also important harmful components in washing and bleaching and dyeing wastewater, and the direct discharge of a large amount of surfactant wastewater can cause serious environmental problems. The straight-chain sulfonic acid/sodium sulfate salt has long biodegradation period and certain biotoxicity; in addition, the waste water containing the detergent is easy to generate a large amount of foam, so that the contact between water and air is prevented, dissolved oxygen in the water is consumed, the self-purification effect of the water body is reduced, the water quality is deteriorated, and the physicochemical property of soil colloid can be changed after the waste water is contacted with soil, so that the growth of crops is seriously influenced.
At present, methods for treating straight-chain sulfonic acid/sodium sulfate salt surfactant wastewater include biodegradation, flocculation, membrane separation, adsorption, electrolysis, catalytic oxidation, electromagnetic methods, and the like. The Chinese invention patent CN 102627341B discloses a preparation method of palygorskite clay composite flocculant, and the material can be used for wastewater treatment containing lignosulfonate anionic surfactant. The Chinese invention patent CN 105731725B discloses a method for removing anionic surfactant in wastewater by using Hall effect to drive anionic surfactant in wastewater to move downwards so as to enrich and form sludge material at the bottom of a water tank. Chinese invention patent CN 102348646B discloses a method and apparatus for removing partially fluorinated and perfluorinated alkyl sulfonate surfactant in wastewater and sewage sludge by electrolysis.
The adsorption method is to utilize porous solid matters to absorb and separate pollutants in water, has the advantages of high speed, good stability and the like, and the adsorption resin is an artificially synthesized adsorption material with a porous three-dimensional structure, and plays a role in separation and purification by virtue of Van der Waals force, hydrogen bonds, ionic interaction and the like between a reticular chain segment and adsorbed molecules (adsorbates) through the huge specific surface area of the adsorption resin. However, there are problems that the adsorption capacity of the adsorption resin is insufficient and the consumption of the desorption solution is large in the treatment of the wastewater containing the anionic surfactant. The above problems restrict the use of the adsorption resin method for treating washing and bleaching wastewater containing anionic surfactants.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a fatty acid modified adsorption resin and a preparation method thereof. The invention also provides a method for treating wastewater by using the resin, in particular to a method for treating wastewater containing an anionic surfactant, which meets the wastewater discharge requirement and realizes efficient adsorption, desorption and resource recovery of the surfactant in the wastewater.
In order to achieve the technical purpose, the invention provides the following technical scheme:
a preparation method of fatty acid modified adsorption resin comprises the following steps:
1) carrying out suspension copolymerization on an aromatic polyvinyl monomer, an acrylate monomer and an unsaturated fatty acid monomer to obtain a fatty acid modified porous white ball;
2) and step 1), immersing the fatty acid modified porous white ball into a cation exchange solution to obtain the fatty acid modified adsorption resin.
In step 1), the skeleton material of the fatty acid modified porous white ball is composed of monomers including aromatic polyvinyl monomers, acrylate monomers and unsaturated fatty acid monomers.
The aromatic polyvinyl monomer is selected from one or more of aromatic compounds containing at least two unsaturated carbon-carbon double bonds and derivatives thereof; preferably, the aromatic polyvinyl monomer is selected from one or more of divinylbenzene, trivinylbenzene, divinyltoluene and divinylethylbenzene; more preferably, the aromatic polyvinyl monomer is selected from divinylbenzene and/or trivinylbenzene.
The acrylate monomer is selected from one or more of acrylate compounds containing at least one unsaturated carbon-carbon double bond and derivatives thereof; preferably, the acrylate monomer is selected from one or more of methyl acrylate, methyl methacrylate, ethylene glycol dimethacrylate, allyl itaconate, allyl isocyanurate, allyl methacrylate, trimethylolpropane trimethacrylate and triethylene glycol dimethacrylate; more preferably, the acrylate monomer is selected from one or more of methyl acrylate, methyl methacrylate and allyl itaconate.
The unsaturated fatty acid monomer is selected from one or more of fatty acids containing at least one unsaturated carbon-carbon double bond and having 6-30 carbon atoms; preferably, the unsaturated fatty acid monomer is selected from one or more of fatty acids containing at least one unsaturated carbon-carbon double bond and 18-22 carbon atoms; more preferably, the unsaturated fatty acid monomer is selected from one or more of oleic acid, linoleic acid, linolenic acid, arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid.
In the step 1), the fatty acid modified porous white spheres are obtained by suspension polymerization, and a reaction system of the suspension polymerization comprises an oil phase and a water phase;
wherein, the oil phase comprises the following components: aromatic polyvinyl monomer, acrylate monomer, unsaturated fatty acid monomer, pore-forming agent and initiator;
the water phase comprises the following components: water, a dispersant, an optional dispersing aid, an optional polymerization aid. The suspension polymerization process of the fatty acid modified porous white spheres can be prepared by a polymerization method conventionally used in the field, and the method is described in detail in the book ion exchange and adsorption resin (johnsen, strong yellow, published by Shanghai science and technology education Press, 1995).
As a preferred technical solution, in the step 1), the method for preparing the fatty acid modified porous white ball comprises: the mass ratio of the oil phase to the water phase is 1: 5-1: 2; the polymerization temperature is 65-95 ℃; the polymerization time is 4-12 h.
As a preferable technical proposal, the proportion of the aromatic polyvinyl monomer to the total monomer (the sum of the mass of the aromatic polyvinyl monomer, the mass of the acrylate monomer and the mass of the unsaturated fatty acid monomer) is 20 to 50 percent, and the proportion is more preferably 25 to 45 percent; the proportion of the acrylate monomer in the total monomer is 10-40%, and more preferably 15-35%; the proportion of the unsaturated fatty acid monomer to the total monomer is 10% to 70%, more preferably 20% to 60%.
As a preferred technical scheme, the pore-foaming agent is selected from one or more of toluene, xylene, ethylbenzene, 3# white oil, 200# solvent oil, cyclohexanol and isooctyl alcohol; the mass ratio of the total monomer to the pore-foaming agent is 3: 1-1: 3, preferably 2: 1-1: 2.
As a preferred technical scheme, the initiator is selected from one or more of Azobisisobutyronitrile (AIBN), Azobisisoheptonitrile (ABVN), dibenzoyl peroxide (BPO), di-tert-butylcyclohexyl peroxydicarbonate (TBCP) and dilauroyl peroxide (LPO); the mass ratio of the total monomers to the initiator is 200: 1-50: 1.
As a preferred technical scheme, the dispersing agent is selected from one or more of polyvinyl alcohol, gelatin, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and hydroxypropyl cellulose, preferably polyvinyl alcohol and/or gelatin; the dispersant accounts for 0.01-0.5 wt.%, preferably 0.05-0.2 wt.% of the aqueous phase.
As a preferred technical solution, in some embodiments, sodium chloride may also be added to the aqueous phase as a dispersion aid, wherein the dispersion aid accounts for 0 to 10 wt.% of the aqueous phase.
As a preferable technical scheme, in some embodiments, methylene blue can be further added into the water phase as a polymerization assistant, and the polymerization assistant accounts for 0-1/10 of the mass of the water phase5。
In the embodiment of the invention, the fatty acid modified porous white ball is obtained by washing a product obtained by suspension polymerization with water, extracting a pore-forming agent and washing with water. It is known to those of ordinary skill in the art that the above water washing, porogen extraction steps do not affect the inherent characteristics of the fatty acid modified porous white spheres such as particle size distribution, specific surface area, pore size, etc. The water washing, porogen extraction steps may be performed using methods conventional in the art.
In step 2), the cation exchange solution is selected from one or more soluble salt solutions containing calcium ions, magnesium ions, aluminum ions, zinc ions and iron ions; preferably, the cation exchange solution is selected from one or more of calcium chloride, calcium nitrate, magnesium chloride, magnesium nitrate, aluminum chloride, aluminum nitrate, aluminum sulfate, zinc chloride, zinc sulfate, zinc nitrate, ferric chloride, ferric sulfate and ferric nitrate solution; more preferably, the cation exchange solution is selected from one or more of calcium chloride, magnesium chloride, aluminum chloride and ferric chloride solution.
In the step 2), the amount of the cation exchange solution is 2-10 mL, preferably 3-5 mL, relative to 1g of the fatty acid modified porous white ball. The concentration of the cation exchange solution is 0.01mol/L to 10mol/L, preferably 0.1mol/L to 5 mol/L.
In the step 2), the soaking reaction time of the fatty acid modified porous white ball in the cation exchange solution is 0.5-8 h, preferably 2-6 h; the soaking temperature is 20-90 ℃, and preferably 40-80 ℃.
In the embodiment of the invention, the fatty acid modified adsorption resin is obtained by washing the product obtained after the soaking reaction with water. It is known to those skilled in the art that the above water washing step does not affect the inherent characteristics of the fatty acid-modified adsorbent resin such as particle size distribution, specific surface area, pore size, etc. This water washing step can be carried out using methods conventional in the art.
The fatty acid modified adsorption resin prepared by the method of the invention, (1) the framework material comprises aromatic polyvinyl monomer, acrylate monomer and unsaturated fatty acid monomer; (2) the fatty acid modified adsorption resin loads cations, and the distribution density of the cations is 1-20 mmol/g, preferably 5-15 mmol/g; (3) the particle size distribution is 100-2000 μm, preferably 300-1200 μm; the specific surface area is 100-1000 m2Preferably 200 to 800 m/g2(ii)/g; the average pore diameter is 3.0-30.0 nm, preferably 5.0-20.0 nm; the pore volume is 0.5 to 2.5mL/g, preferably 0.8 to 2.0 mL/g.
The invention also provides a method for treating wastewater, in particular wastewater containing anionic surfactant, by using the fatty acid modified adsorption resin, which comprises the following steps:
adsorbing the wastewater by a resin column filled with the fatty acid modified adsorption resin, wherein the adsorption temperature is 10-35 ℃, and preferably 15-25 ℃; and after the resin is adsorbed and saturated, stopping the wastewater from entering the column, adding a desorption solution to start desorption, simultaneously heating the resin column to be not less than 40 ℃, preferably to be 45-70 ℃, and recovering the anionic surfactant in the wastewater.
The anionic surfactant is selected from one or more of carboxylate, sulfonate and sulfate; preferably, the anionic surfactant is selected from one or more of sodium palmitate, sodium laurate, sodium myristate, sodium stearate, sodium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium hexadecyl sulfonate, potassium dehydroabietate, sodium abietate and sodium perfluorooctane sulfonate; more preferably, the anionic surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium hexadecyl sulfonate and sodium perfluorooctane sulfonate.
The pH value of the wastewater before adsorption is 2-9, preferably 3-8. In some embodiments of the present invention, the pH may be adjusted in advance according to the composition of the anionic surfactant in the wastewater and the substance desired to be recovered, to improve the adsorption efficiency of the fatty acid-modified adsorption resin.
The adsorption process of the wastewater flowing through the resin column is carried out continuously and dynamically, the flow rate is 1-60 BV/h, preferably 2-50 BV/h, wherein BV is the volume of the fatty acid modified adsorption resin for treating the wastewater. The adsorption temperature refers to the temperature at which the wastewater passes through the fatty acid-modified adsorbent resin. In some embodiments, the temperature is maintained by an external temperature control device.
The desorption is to make the desorption liquid flow through the fatty acid modified adsorption resin bed layer to carry out desorption regeneration. The desorption liquid comprises one of pure water and acid solution. In some preferred embodiments, the acid solution is an aqueous solution of hydrochloric acid, and the mass concentration of the acid solution is 0.01-1 wt.%. The fatty acid modified adsorption resin after desorption and regeneration can be continuously used for treating wastewater containing anionic surfactant.
In the embodiment of the invention, the desorption process is carried out in a continuous and dynamic mode, and the flow rate of the desorption liquid is 0.5-10 BV/h, preferably 1-5 BV/h; the temperature for desorption regeneration is 40-90 ℃, and preferably 45-70 ℃. In the embodiment of the present invention, the temperature of desorption regeneration refers to the temperature at which the desorption liquid passes through the fatty acid-modified adsorbent resin. In some embodiments, the temperature is maintained by an external temperature control device.
In some embodiments of the present invention, the adsorption process of the present invention can be used in combination with flocculation, electrolysis, etc. to increase the efficiency of anionic surfactant treatment in wastewater.
The invention has the beneficial effects that:
(1) unsaturated fatty acid monomers with a structure similar to that of a straight-chain anionic surfactant are introduced to the surface and the interior of the styrene skeleton adsorption resin, a 'key lock structure' is formed in the resin, and the specific adsorption capacity of the adsorption resin on the anionic surfactant is enhanced; on the other hand, multivalent cations are introduced on the surface and in the adsorption resin through cation exchange, so that the chelating effect of the adsorption resin and the anionic surfactant is enhanced. The two act together, the adsorption efficiency is obviously improved, high-flow-rate quick adsorption can be realized, and the wastewater treatment capacity per unit time is improved.
(2) The fatty acid modified adsorption resin simultaneously contains a rigid styrene chain segment, flexible acrylate and a fatty acid chain segment, so that the basic appearance and the stability of a particle structure of the adsorption resin in the adsorption and desorption processes are ensured, the stable treatment working condition and the column pressure are favorably kept, the adsorption resin has certain swelling property in hot water, the desorption of an anionic surfactant from the surface of the resin in a heating environment is accelerated, the desorption can be completed only by using the hot water as desorption liquid, the desorption efficiency is improved, the use of chemical agents is reduced, and the desorption cost is reduced.
Based on the beneficial effects, the fatty acid modified adsorption resin prepared by the method provided by the invention is used for treating wastewater containing anionic surfactant, so that the treatment cost can be obviously reduced, the resource recovery of anionic surfactant substances in the wastewater is realized, and the pollution to the environment is reduced.
Detailed Description
Raw material source information:
| name of raw materials | Specification of | Source |
| Divinylbenzene | 63％，80％ | Radix Et rhizoma Rhei |
| White oil | 3# | Dongying Junyuan |
| Solvent oil | 200# | Dongying Junyuan |
| Polyvinyl alcohol | 088-20 | Chuanwei tea |
| Gelatin | E40＝12 | Zibo Ouchang |
| Hydroxypropyl methylcellulose | 60SH50 | Great profit of fat city |
| Hydroxyethyl cellulose | MS＝1.5 | Great profit of fat city |
| Hydroxypropyl cellulose | MS>3.5 | Great profit of fat city |
Instrument information used in the examples:
the specific surface area, the pore diameter and the pore volume of the fatty acid modified adsorption resin are obtained by a specific surface area analyzer (Micromeritics ASAP 2460), and the detection is according to GB/T19587-. The anionic surfactant content was determined by TOC meter (Analytik Jena AG 2100S) or spectrophotometer (Shanghai Meta-analysis, X-3). The composition of the fatty acid-modified adsorbent resin was determined by pyrolysis gas chromatography-mass spectrometer (SHIMADZU GCMS-QP2010 Ultra).
The present invention is described in more detail by the following examples, which are not intended to limit the present invention.
Example 1
At room temperature, a premixed aqueous phase was added, consisting of 572.2g of deionized water, 30.2g of sodium chloride, 0.6g of polyvinyl alcohol, and 0.6mg of methylene blue. The premixed oil phase was added to make up of divinylbenzene 30g, methyl methacrylate 25g, oleic acid 45g, toluene 50g, white oil # 3 50g, AIBN 0.5g, BPO 0.5 g. Stirring, heating to 85 ℃, keeping the temperature constant for 6 hours, and washing with water, extracting the pore-forming agent and washing with water to obtain the fatty acid modified porous white ball.
And (3) putting 50.0g of the fatty acid modified porous white ball into 150mL of calcium chloride solution (the concentration is 1mol/L), stirring and soaking for 4h at 60 ℃, washing with water, and filtering to obtain the fatty acid modified adsorption resin. The calcium ion distribution density in the fatty acid modified adsorption resin is 10mmol/g, the particle size is 400-1200 mu m,specific surface area of 400m2(ii)/g, average pore diameter was 10.0nm, and pore volume was 1.0 mL/g.
The fatty acid modified adsorption resin is used for treating wastewater containing anionic surfactant (the composition is 100mg/L of sodium dodecyl benzene sulfonate, pH is 5), the adsorption flow rate is 10BV/h, the adsorption temperature is 20 ℃, and the unit adsorption capacity of the resin to the sodium dodecyl benzene sulfonate in the wastewater is 200 g/L.
Controlling the desorption temperature to be 60 ℃, desorbing the sodium dodecyl benzene sulfonate in the fatty acid modified adsorption resin by using pure water, wherein the flow rate of a desorption solution is 2BV/h, and after desorption of 3BV, the recovery rate of the sodium dodecyl benzene sulfonate is 98%.
Comparative example 1
The anionic surfactant in the wastewater of example 1 (wastewater composition was the same as in example 1) was treated with a commercially available 711 anion exchange resin (Sanxingsu resin works, Anhui), the adsorption flow rate and adsorption temperature were the same as in example 1, and the adsorption amount per unit of sodium dodecylbenzenesulfonate in the wastewater by the resin was 100 g/L. 711 resin is eluted with 4 wt.% NaOH aqueous solution, the flow rate of the desorption solution is 1BV/h, the desorption temperature is 50 ℃, the recovery rate of the sodium dodecyl benzene sulfonate is 70% after 5BV desorption, and the recovery rate of the sodium dodecyl benzene sulfonate is 90% after 7BV desorption.
Example 2
At room temperature, the premixed aqueous phase was added to the mixture, which consisted of 1507g deionized water, 3g gelatin, and 15mg methylene blue. Adding premixed oil phase, wherein the premixed oil phase comprises 25g of trivinyl benzene, 15g of allyl itaconate, 60g of linoleic acid, 50g of xylene, 150g of No. 200 solvent oil, 1g of ABVN and 1g of TBCP. Stirring, heating to 65 ℃, keeping the temperature constant for 12 hours, and washing with water, extracting the pore-forming agent and washing with water to obtain the fatty acid modified porous white ball.
And (3) putting 50.0g of the fatty acid modified porous white ball into 250mL of magnesium chloride solution (with the concentration of 5mol/L), stirring and soaking at 80 ℃ for 2h, washing with water, and filtering to obtain the fatty acid modified adsorption resin. The fatty acid modified adsorption resin has the magnesium ion distribution density of 15mmol/g, the particle size of 300-1000 mu m and the specific surface area of 200m2(ii)/g, average pore diameter was 20.0nm, and pore volume was 0.8 mL/g.
The above-mentioned fatty acid modified adsorption resin was used to treat wastewater containing anionic surfactant (composition: 50mg/L sodium lauryl sulfate, pH 8), the adsorption flow rate was 50BV/h, the adsorption temperature was 25 ℃, and the adsorption amount of the resin per unit of sodium lauryl sulfate in the wastewater of this example was 300 g/L.
Controlling the desorption temperature at 70 ℃, desorbing the sodium dodecyl sulfate in the fatty acid modified adsorption resin by using pure water, wherein the flow rate of a desorption solution is 5BV/h, and the recovery rate of the sodium dodecyl sulfate after desorbing for 2BV is 95%.
Example 3
At room temperature, a premixed aqueous phase was added, consisting of 270.7g deionized water, 30.1g sodium chloride, 0.2g hydroxypropyl methylcellulose. The premixed oil phase is added, and the composition comprises 20g of divinylbenzene, 25g of trivinylbenzene, 10g of methyl acrylate, 25g of methyl methacrylate, 10g of linolenic acid, 10g of arachidonic acid, 10g of ethylbenzene, 20g of cyclohexanol, 20g of isooctanol and 0.5g of LPO. Stirring, heating to 95 ℃, keeping the temperature constant for 4 hours, and washing with water, extracting the pore-forming agent and washing with water to obtain the fatty acid modified porous white ball.
And (3) putting 50.0g of the fatty acid modified porous white ball into 150mL of aluminum chloride and ferric chloride mixed solution (the concentration of aluminum chloride is 0.05mol/L, and the concentration of ferric chloride is 0.05mol/L), stirring and soaking at 40 ℃ for 6h, washing with water, and filtering to obtain the fatty acid modified adsorption resin. The fatty acid modified adsorption resin has the distribution density of aluminum ions of 2.5mmol/g, the distribution density of iron ions of 2.5mmol/g, the particle size of 600-1200 mu m and the specific surface area of 800m2(ii)/g, average pore diameter was 5.0nm, and pore volume was 2.0 mL/g.
The above-mentioned fatty acid modified adsorption resin was used to treat wastewater containing anionic surfactant (with the composition of 20mg/L sodium hexadecyl sulfonate, 20mg/L sodium perfluorooctane sulfonate, pH 3), the adsorption flow rate was 2BV/h, the adsorption temperature was 15 ℃, and the total unit adsorption amount of resin to sodium hexadecyl sulfonate and sodium perfluorooctane sulfonate in the wastewater of this example was 240 g/L.
Controlling the desorption temperature to be 45 ℃, desorbing the sodium hexadecylsulfonate and the sodium perfluorooctane sulfonate in the fatty acid modified adsorption resin by using pure water, wherein the flow rate of a desorption solution is 1BV/h, and after 3BV of desorption, the recovery rate of the sodium hexadecylsulfonate and the sodium perfluorooctane sulfonate is 97 percent.
Claims (10)
1. A preparation method of fatty acid modified adsorption resin comprises the following steps:
1) carrying out suspension copolymerization on an aromatic polyvinyl monomer, an acrylate monomer and an unsaturated fatty acid monomer to obtain a fatty acid modified porous white ball;
2) and (3) immersing the fatty acid modified porous white balls into a cation exchange solution to obtain the fatty acid modified adsorption resin.
2. The method according to claim 1, wherein the aromatic polyvinyl monomer in step 1) is selected from one or more of aromatic compounds containing at least two unsaturated carbon-carbon double bonds and derivatives thereof; preferably, the aromatic polyvinyl monomer is selected from one or more of divinylbenzene, trivinylbenzene, divinyltoluene and divinylethylbenzene; more preferably, the aromatic polyvinyl monomer is selected from divinylbenzene and/or trivinylbenzene.
3. The method according to claim 1, wherein the acrylate monomer in step 1) is selected from one or more of acrylate compounds containing at least one unsaturated carbon-carbon double bond and derivatives thereof; preferably, the acrylate monomer is selected from one or more of methyl acrylate, methyl methacrylate, ethylene glycol dimethacrylate, allyl itaconate, allyl isocyanurate, allyl methacrylate, trimethylolpropane trimethacrylate and triethylene glycol dimethacrylate; more preferably, the acrylate monomer is selected from one or more of methyl acrylate, methyl methacrylate and allyl itaconate.
4. The method according to claim 1, wherein the unsaturated fatty acid monomer in step 1) is selected from one or more of fatty acids with 6-30 carbon atoms, which contain at least one unsaturated carbon-carbon double bond; preferably, the unsaturated fatty acid monomer is selected from one or more of fatty acids containing at least one unsaturated carbon-carbon double bond and 18-22 carbon atoms; more preferably, the unsaturated fatty acid monomer is selected from one or more of oleic acid, linoleic acid, linolenic acid, arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid.
5. The method according to any one of claims 1 to 4, wherein the aromatic polyvinyl monomer is 20 to 50% by mass of the total monomers, the acrylic ester monomer is 10 to 40% by mass of the total monomers, and the unsaturated fatty acid monomer is 10 to 70% by mass of the total monomers.
6. The method according to claim 1, wherein the cation exchange solution in step 2) is selected from one or more of soluble salt solutions containing calcium ions, magnesium ions, aluminum ions, zinc ions and iron ions; preferably, the cation exchange solution is selected from one or more of calcium chloride, magnesium chloride, aluminum chloride and ferric chloride solution;
preferably, the concentration of the cation exchange solution is 0.01-10 mol/L, preferably 0.1-5 mol/L;
preferably, the dosage of the cation exchange solution is 2-10 mL relative to 1g of the fatty acid modified porous white ball.
7. The method according to claim 1 or 6, wherein in the step 2), the soaking time of the fatty acid modified porous white balls in the cation exchange solution is 0.5-8 h, preferably 2-6 h; the soaking temperature is 20-90 ℃, and preferably 40-80 ℃.
8. A fatty acid modified adsorption resin prepared according to the method of any one of claims 1 to 7;
preferably, the fatty acid modified adsorption resin is loaded with cations, and the distribution density of the cations is 1-20 mmol/g; the particle size distribution is 100-2000 mu m; the specific surface area is 100-1000 m2(ii)/g; averageThe aperture is 3.0-30.0 nm; the pore volume is 0.5-2.5 mL/g.
9. A method for treating wastewater containing anionic surfactant by using the fatty acid modified adsorption resin of claim 8, which comprises the following steps: adsorbing the wastewater by using the fatty acid modified adsorption resin;
preferably, the anionic surfactant is selected from one or more of carboxylate, sulfonate, sulfate; preferably, the sodium salt is selected from one or more of sodium palmitate, sodium laurate, sodium myristate, sodium stearate, sodium lauryl sulfate, sodium dodecyl benzene sulfonate, sodium hexadecyl sulfonate, potassium dehydroabietate, sodium abietate and sodium perfluorooctane sulfonate.
10. The method according to claim 9, wherein the flow rate of the waste water is 1-60 BV/h; the adsorption temperature is 10-35 ℃.
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