CN110508262B - Lead-cadmium ion imprinted magnetic SBA-15 particle and preparation method thereof - Google Patents
Lead-cadmium ion imprinted magnetic SBA-15 particle and preparation method thereof Download PDFInfo
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- CN110508262B CN110508262B CN201910690992.8A CN201910690992A CN110508262B CN 110508262 B CN110508262 B CN 110508262B CN 201910690992 A CN201910690992 A CN 201910690992A CN 110508262 B CN110508262 B CN 110508262B
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- 239000002245 particle Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 29
- 229910003321 CoFe Inorganic materials 0.000 claims abstract description 22
- 229940074391 gallic acid Drugs 0.000 claims abstract description 20
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- 239000011859 microparticle Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 22
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 21
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 17
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 16
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
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- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 3
- OZAIFHULBGXAKX-VAWYXSNFSA-N AIBN Substances N#CC(C)(C)\N=N\C(C)(C)C#N OZAIFHULBGXAKX-VAWYXSNFSA-N 0.000 claims description 3
- 238000005804 alkylation reaction Methods 0.000 claims description 3
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- 238000000926 separation method Methods 0.000 claims description 3
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- 230000029936 alkylation Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 abstract description 13
- 238000001179 sorption measurement Methods 0.000 abstract description 13
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 abstract description 8
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- 239000006249 magnetic particle Substances 0.000 abstract description 3
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- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 abstract description 2
- 229910017052 cobalt Inorganic materials 0.000 abstract description 2
- 239000010941 cobalt Substances 0.000 abstract description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract description 2
- 239000013335 mesoporous material Substances 0.000 abstract description 2
- 239000002114 nanocomposite Substances 0.000 abstract description 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 2
- 238000007598 dipping method Methods 0.000 abstract 1
- 229910002518 CoFe2O4 Inorganic materials 0.000 description 30
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 206010018367 Glomerulonephritis chronic Diseases 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
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- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
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- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(III) nitrate Inorganic materials [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 1
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- 238000002414 normal-phase solid-phase extraction Methods 0.000 description 1
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- ORIHZIZPTZTNCU-YVMONPNESA-N salicylaldoxime Chemical compound O\N=C/C1=CC=CC=C1O ORIHZIZPTZTNCU-YVMONPNESA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/268—Polymers created by use of a template, e.g. molecularly imprinted polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- Hard Magnetic Materials (AREA)
Abstract
本发明提供一种铅镉离子印迹磁性SBA‑15微粒及其制备方法，利用浸渍法合成具有纳米复合结构的CoFe2O4/SBA‑15磁性复合材料，并结合分子印迹技术，以没食子酸和乙二胺为功能单体，制备了铅镉离子印迹磁性SBA‑15微粒。所述磁性微粒可以对痕量的铅镉离子进行吸附，扩大了钴铁氧体和介孔材料的应用范围，提高了对铅镉离子的吸附容量和选择性。
The invention provides lead and cadmium ion imprinted magnetic SBA-15 particles and a preparation method thereof. CoFe 2 O 4 /SBA-15 magnetic composite material with nano-composite structure is synthesized by dipping method, combined with molecular imprinting technology, gallic acid and Using ethylenediamine as the functional monomer, lead-cadmium ion-imprinted magnetic SBA-15 microparticles were prepared. The magnetic particles can adsorb trace amounts of lead and cadmium ions, expand the application range of cobalt ferrite and mesoporous materials, and improve the adsorption capacity and selectivity of lead and cadmium ions.
Description
Technical Field
The invention relates to the field of heavy metal ion enrichment, in particular to a lead-cadmium ion imprinted magnetic SBA-15 particle and a preparation method thereof.
Background
Cadmium and lead are heavy metal elements which are seriously polluted and have strong toxicity at present, and even if the concentration of cadmium and lead is extremely low in the natural environment, the cadmium and lead can cause serious harm to human beings. Excessive lead intake by people can inhibit the development of the brain, resulting in chronic nephritis; the food polluted by lead can be enriched to human body through food chain, thus causing harm to human body, when the content of blood lead reaches 2.9-3.86 mu mol.L-1Lead poisoning can occur, and cadmium has carcinogenicity; in addition, cadmium accumulation in the body can lead to impaired renal function and calcium and phosphorusImpaired regulatory function, resulting in decalcification, osteomalacia, and pathological fracture. However, because the contents of lead and cadmium in the environmental and food samples are generally extremely low, the separation and enrichment of trace lead and cadmium has important significance for monitoring the contents of lead and cadmium ions in the environmental and food samples.
The general methods for separating and enriching heavy metals include liquid-liquid extraction, solid-phase extraction, activated carbon adsorption and the like, but have the defects of low efficiency, high cost and complex operation; the magnetic molecular imprinting technology not only has stronger adsorption capacity on heavy metals, but also has the characteristic of controllable magnetic separation, avoids complex concentration and classification processes such as centrifugation and filtration, and is widely concerned in the field of heavy metals.
The existing magnetic imprinted polymer generally takes methacrylic acid, salicylaldoxime, acrylamide, vinylpyridine and the like as functional monomers, has certain toxicity to human bodies, has the defects of low adsorption selectivity, small adsorption capacity and low reuse rate, and is difficult to separate and enrich trace heavy metal concentration.
Disclosure of Invention
Aiming at the problems, the invention provides a lead-cadmium ion imprinted magnetic SBA-15 particle and a preparation method thereof.
The purpose of the invention is realized by adopting the following technical scheme:
a preparation method of lead-cadmium ion imprinted magnetic SBA-15 particles comprises the following steps:
(1)CoFe2O4preparation of SBA-15;
(2)CoFe2O4SBA-15 surface alkylation
CoFe2O4Adding anhydrous ethanol into SBA-15, adding CPTES under stirring, stirring in constant temperature water bath, filtering to obtain product, washing with distilled water to neutrality, and vacuum drying to obtain CPTES-CoFe2O4/SBA-15；
(3)EDA@CPTES-CoFe2O4Synthesis of/SBA-15
CPTES-CoFe2O4Adding excessive EDA into methanol solution of SBA-15, stirring at constant temperature for reaction, and filtering to obtain productWashing the product with distilled water to neutrality, and vacuum drying to obtain EDA @ CPTES-CoFe2O4/SBA-15；
(4) Gallic acid @ EDA @ CPTES-CoFe2O4Synthesis of SBA-15 Material
EDA@CPTES-CoFe2O4Adding gallic acid into ethanol solution of SBA-15, stirring at constant temperature for reaction, filtering out the product after the reaction is finished, washing the product to be neutral by distilled water, and drying in vacuum to obtain gallic acid @ EDA @ CPTES-CoFe2O4/SBA-15；
(5) Synthesis of imprinted magnetic SBA-15 microparticles
Gallic acid @ EDA @ CPTES-CoFe2O4The SBA-15 is dissolved in acetic acid solution, and Pb is slowly added2+、Cd2+The mixed saturated solution is mechanically stirred for reaction, a cross-linking agent and an initiator are added, and the mechanical stirring reaction is continued to obtain the CoFe2O4The surface imprinted Polymer (PMS) with/SBA-15 as carrier is prepared by grinding and sieving PMS, and oscillating in mixed solution of hydrochloric acid and EDTA until Pb can not be detected2+、Cd2+Filtering and washing the product to be neutral by using deionized water, and drying the product in vacuum to constant weight to obtain the lead-cadmium ion imprinted magnetic SBA-15 particles;
preferably, the absolute ethanol and CoFe in the step (2)2O4The mixing ratio of SBA-15 is 5-20mL/g, CPTES and CoFe2O4The mixing ratio of SBA-15 is 0.5-2.0 mL/g;
preferably, the constant-temperature stirring reaction condition in the step (2) is that the water bath temperature is 25 ℃, and the stirring time is 16 h;
preferably, the methanol in step (3) is mixed with CPTES-CoFe2O4The mixing ratio of SBA-15 is 10-30 mL/g;
preferably, the constant-temperature stirring reaction condition in the step (3) is that the water bath temperature is 60 ℃, and the stirring time is 16 h;
preferably, the ethanol in step (4) is reacted with EDA @ CPTES-CoFe2O4The mixing ratio of SBA-15 is 5-50mL/g, and the gallic acid and EDA @ CPTES-CoFe2O4The mixing ratio of SBA-15 is 0.2-2.0 g/g;
preferably, the constant-temperature stirring reaction condition in the step (4) is that the water bath temperature is 70 ℃, and the stirring time is 1 h;
preferably, the concentration of the acetic acid solution in the step (5) is 0.1mol/L, and the acetic acid solution and the gallic acid @ EDA @ CPTES-CoFe2O4The mixing ratio of SBA-15 is 20-50 mL/g;
preferably, the crosslinking agent in the step (5) is KH-560, the initiator is AIBN, and the reaction product is gallic acid @ EDA @ CPTES-CoFe2O4The mixing ratio of SBA-15 is 5-20g/g and 100-300mg/g respectively;
preferably, in the mixed solution of hydrochloric acid and EDTA in the step (5), the concentration of hydrochloric acid is 0.2mol/L and the concentration of EDTA is 0.1 mol/L.
The second purpose of the present application is to provide a lead-cadmium ion-imprinted magnetic SBA-15 microparticle, wherein the lead-cadmium ion-imprinted magnetic SBA-15 microparticle is prepared by any one of the above preparation methods.
It is another object of the present application to provide an application of the lead-cadmium ion imprinted magnetic SBA-15 particles, including detection, enrichment and/or separation of lead and/or cadmium heavy metals in a sample to be detected.
The invention has the beneficial effects that:
the application utilizes an immersion method to synthesize CoFe with a nano composite structure2O4The magnetic composite material/SBA-15 magnetic composite material is combined with a molecular imprinting technology, gallic acid and ethylenediamine are used as functional monomers, the lead-cadmium ion imprinting magnetic SBA-15 particles are prepared, the magnetic particles can adsorb trace lead-cadmium ions, the application range of cobalt ferrite and mesoporous materials is expanded, the adsorption capacity and selectivity of lead-cadmium ions are improved, and the reuse rate is high.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic diagram of the preparation process of the lead-cadmium ion imprinted magnetic SBA-15 particle.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
A preparation method of lead-cadmium ion imprinted magnetic SBA-15 particles comprises the following steps:
(1)CoFe2O4preparation of SBA-15
Using 300 mL1.6mol.L-1Dissolving 8g of P123 by using HCl (hydrochloric acid) at the constant temperature of 40 ℃ under magnetic stirring to obtain uniform bluish microemulsion, adding 12ml of TEOS, continuing to carry out magnetic stirring for 6h to obtain white emulsion, dropwise adding TEOS18mL, carrying out rapid magnetic stirring for 24h at the temperature of 100 ℃, crystallizing for 24h at room temperature, filtering a product, calcining for 6h at the temperature of 550 ℃ in air to remove a template agent, and grinding to obtain SBA-15; mixing Co (NO)3)2·6H2O and Fe (NO)3)3·9H2Dissolving O in ethanol at a molar ratio of 1:2 to obtain saturated solution, dropwise adding 4mL of ethanol saturated solution into 20mL of n-hexane dissolved with 4g of SBA-15 powder, absorbing tail gas with low-concentration ethanol aqueous solution, magnetically stirring at room temperature for 20h, and adding light pink Co (NO) at the bottom3)2-Fe(NO3)3The product is filtered and calcined in the air at 800 ℃ for 5 hours to obtain brown product CoFe2O4/SBA-15；
(2)CoFe2O4SBA-15 surface alkylation reaction
3gCoFe2O4Adding SBA-15 into dry round-bottom flask, adding 30mL of anhydrous ethanol, stirring, adding 3mL of LCPTES while stirring, slowly stirring in 25 ℃ water bath machine for 16h, filtering, washing with distilled water to obtain neutral product, vacuum drying at 60 ℃ overnight, taking out, and bottling to obtain CPTES-CoFe2O4/SBA-15；
(3)EDA@CPTES-CoFe2O4Synthesis of SBA-15 Material
Accurately weighing 2g of dry CPTES-CoFe2O4SBA-15 in a round-bottom flask containing 30mL of methanol, adding excess EDA, reacting for 16h at 60 ℃ with mechanical stirring, and generating product after the reaction is finishedFiltering, washing with distilled water to neutrality, vacuum drying at 60 deg.C, taking out, and bottling to obtain EDA @ CPTES-CoFe2O4/SBA-15；
(4) Gallic acid @ EDA @ CPTES-CoFe2O4Synthesis of SBA-15 Material
Accurately weighing 1g of dried EDA @ CPTES-CoFe2O4Adding 0.5g of gallic acid into a round-bottom flask filled with 30mL of ethanol, mechanically stirring at 70 ℃ for reaction for 1h, filtering the product after the reaction is finished, washing the product to be neutral by using distilled water, drying the product at 60 ℃ in vacuum after the washing is finished, taking out the product and bottling the product for later use to obtain the gallic acid @ EDA @ CPTES-CoFe2O4/SBA-15；
(5) Synthesis of molecularly imprinted polymers
Weighing 3.0g of gallic acid @ EDA @ CPTES-CoFe2O4The SBA-15 is dissolved in 100 mL0.1mol.L-1To the acetic acid solution of (1), slowly adding Pb dropwise at 25 deg.C2+、Cd2+5ml of mixed saturated solution is added with 20.0g of cross-linking agent KH-560 and 500mg of initiator AIBN after the mechanical stirring reaction is carried out for 1 hour, and the mechanical stirring reaction is continued for 4.5 hours to obtain the product of CoFe2O4A surface imprinted Polymer (PMS) with SBA-15 as a carrier; grinding and screening PMS, and transferring to 100 mL0.2mol.L-1Hydrochloric acid and 0.1 mol. L- 1Oscillating for 12h in EDTA mixed solution until no Pb can be detected by the instrument2+、Cd2+The content of (A); and filtering and washing the solid product by using deionized water until the solid product is neutral, and then placing the solid product in a vacuum drying oven to dry the solid product to constant weight to obtain the lead-cadmium ion imprinted magnetic SBA-15 particles.
Example 2
Taking commercially available green tea, black tea, jasmine tea and black tea as samples to be measured, crushing the tea, sieving the crushed tea with a 200-mesh sieve, accurately weighing 2.0000g of the crushed tea in a digestion tube, adding 10mL of nitric acid, carrying out digestion at 250 ℃ for 20min after setting a program of 20min before a microwave digestion instrument, carrying out programmed cooling to room temperature, taking out the solution, removing acid, cooling, and then fixing the volume with a buffer solution with the pH value of 6 for measurement.
The measurement results of lead and cadmium in different tea leaves are shown in Table 1, and it can be seen from Table 1 that the lead and cadmium are commercially availableThe jasmine tea has the lowest lead content, and the next is green tea and black tea, and the highest lead content is black tea (Pu' er tea) of 0.0030 mg.kg-1、0.0069mg·kg-1、0.032mg·kg-1、0.081mg·kg-1(ii) a The cadmium content of commercially available jasmine tea is also minimum, and the second is green tea and black tea (Pu' er tea), and the highest cadmium content is black tea, and is 0.11 mg/kg-1、0.13mg·kg-1、0.16mg·kg-1、0.19mg·kg-1(ii) a According to the national standard, the lead content in the tea cannot be more than 5 mg/kg-1, and according to the industrial standard, the cadmium content in the tea cannot exceed 1 mg/kg-1As can be seen, the black tea (Pu' er tea) with the highest lead content in the batch of samples only contains 0.081mg kg-1The black tea with the highest cadmium content only contains 0.19 mg/kg-1The safety state of the batch of tea leaves is good.
TABLE 1 measurement of lead and cadmium in different tea leaves (n ═ 3)
Examples of the experiments
Accurately weighing 0.1g (dry weight) of lead-cadmium ion imprinted magnetic SBA-15 particles (MIP) to 25mL of Cd-containing particles2+、Pb2+、Cu2 +、Zn2+、Mn2+And the concentrations are all 1.0 mg/mL-1(pH 6) adsorbing with shaking at 25 deg.C for 1 hr, separating adsorbent with magnetic field, collecting supernatant, and measuring Cd in the solution with atomic absorption spectrometer2+、Pb2+、Cu2+、Zn2+、Mn2+The concentration of (a) is compared with that of the non-ionic imprinted magnetic particles (NIP).
The distribution coefficient K is calculated as followsdSelecting coefficient k and imprinting factor alpha.
Kd＝Q/c0
k＝Kd(Cd2+、Pb2+、Cu2+、Zn2+、Mn2+)/Kd(Zn2+)
α＝kMIP/kNIP
Q is MIP or NIP to Cd2+、Pb2+、Cu2+、Zn2+、Mn2+Adsorption capacity or binding concentration (mg/g), c0Is the initial concentration of the solution.
Table 2 shows MIP and NIP vs. Pb2+、Cd2+And its analog Cu2+，Zn2+And Mn2+Adsorption capacity (Q) and partition coefficient (K) ofd) A selection coefficient (k) and an imprinting factor (alpha).
TABLE 2 adsorption and selectivity of MIP and NIP
As can be seen from Table 2, the lead-cadmium ion-imprinted magnetic SBA-15 fine particles are aligned with Pb2+And Cd2+Has a significantly larger adsorption capacity than that of Mn2 +，Cu2+And Zn2+The adsorption capacity of the magnetic material shows that the lead-cadmium ion imprinted magnetic SBA-15 particles have good specific adsorption on template molecules, and the high specific adsorption of the imprinted molecules on the template can be seen by the selectivity coefficient of the magnetic material being greater than 10, so that the obtained product has good selectivity; the lead-cadmium ion imprinted magnetic SBA-15 particle has a specific recognition cavity on the surface, and can specifically adsorb imprinted ions Pb2+、Cd2+。
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
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