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Lead-cadmium ion imprinted magnetic SBA-15 micro-particles and preparation method thereof

A cadmium ion, imprinting technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of complicated operation, low reusability, high cost, etc., and improve the adsorption capacity. and selectivity, high reuse rate, and the effect of expanding the scope of application

Active Publication Date: 2019-11-29
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The general methods for the separation and enrichment of heavy metals include liquid-liquid extraction, solid-phase extraction, activated carbon adsorption, etc., but there are disadvantages of low efficiency, high cost, and complicated operation; and magnetic molecular imprinting technology not only has strong adsorption for heavy metals ability, and has the characteristics of controllable magnetic separation, avoiding complicated concentration and classification processes such as centrifugation and filtration, and its application in the field of heavy metals has attracted wide attention
[0004] The existing magnetically imprinted polymers generally use methacrylic acid, salicylaldoxime, acrylamide, and vinylpyridine as functional monomers, which not only have certain toxicity to the human body, but also have the disadvantages of low adsorption selectivity and small adsorption capacity. Low usage rate, difficult to separate and enrich trace heavy metal concentration

Method used

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  • Lead-cadmium ion imprinted magnetic SBA-15 micro-particles and preparation method thereof
  • Lead-cadmium ion imprinted magnetic SBA-15 micro-particles and preparation method thereof
  • Lead-cadmium ion imprinted magnetic SBA-15 micro-particles and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of lead-cadmium ion-imprinted magnetic SBA-15 particles, comprising the following steps:

[0035] (1) CoFe 2 O 4 Preparation of / SBA-15

[0036] Use 300mL1.6mol·L -1 The HCl dissolved 8g P123 under constant temperature magnetic stirring at 40 °C to obtain a uniform bluish microemulsion, 12 mL of TMB was added, and the magnetic stirring was continued for 6 h to obtain a white emulsion. After crystallization at room temperature for 24 hours, the product was filtered and calcined in air at 550 °C for 6 hours to remove the template agent, and ground to obtain SBA-15; Co(NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O was dissolved in ethanol at a molar ratio of 1:2 to form a saturated solution, 4 mL of saturated ethanol solution was added dropwise to 20 mL of n-hexane dissolved 4 g of SBA-15 powder, the exhaust gas was absorbed with low-concentration ethanol aqueous solution, and magnetic stirring was continued at room temperature. After 20h, the bot...

Embodiment 2

[0046] Take commercially available green tea, black tea, jasmine tea, and dark tea as the samples to be tested, pulverize the tea leaves through a 200-mesh sieve, accurately weigh 2.0000g into the digestive tube, add 10mL of nitric acid, and program the temperature to 250°C 20min before setting the microwave digestion apparatus. , and then digested at 250°C for 20min, and finally cooled to room temperature by program, taken out, driven off the acid, cooled with a buffer solution of pH=6 to volume, and used for determination.

[0047] The measurement results of lead and cadmium in different tea leaves are shown in Table 1. It can be seen from Table 1 that the lead content of commercially available jasmine tea is the smallest, followed by green tea and black tea, and black tea (Pu'er) with the highest lead content. 0.0030mg·kg respectively -1 , 0.0069mg kg -1 , 0.032 mg kg -1 , 0.081mg·kg -1 The cadmium content of commercially available jasmine tea is also the smallest, follo...

experiment example

[0051] Accurately weigh 0.1g (dry weight) of lead-cadmium ion-imprinted magnetic SBA-15 microparticles (MIP) into 25mL containing Cd 2+ , Pb 2+ , Cu 2 + , Zn 2+ , Mn 2+ And the concentration is 1.0mg·mL -1 (pH=6) solution, shake and adsorb at 25 °C for 1 h, separate the adsorbent with a magnetic field, take the supernatant, and use an atomic absorption spectrometer to determine the Cd in the solution. 2+ , Pb 2+ , Cu 2+ , Zn 2+ , Mn 2+ The concentration was compared with non-ionic imprinted magnetic particles (NIP).

[0052] Calculate the distribution coefficient K as follows d , the selection coefficient k and the imprinting factor α.

[0053] K d =Q / c 0

[0054] k=K d (Cd 2+ , Pb 2+ , Cu 2+ , Zn 2+ , Mn 2+ ) / K d (Zn 2+ )

[0055] α=k MIP / k NIP

[0056] Q is MIP or NIP versus Cd 2+ , Pb 2+ , Cu 2+ , Zn 2+ , Mn 2+ adsorption capacity or binding concentration (mg / g), c 0 is the initial concentration of the solution.

[0057] Table 2 for MIP and...

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Abstract

The invention provides lead-cadmium ion imprinted magnetic SBA-15 micro-particles and a preparation method thereof. According to the present invention, a CoFe2O4 / SBA-15 magnetic composite material with a nanometer composite structure is synthesized by utilizing an impregnation method, and lead-cadmium ion imprinted magnetic SBA-15 micro-particles are prepared by combining with a molecular imprinting technology and using gallic acid and ethylenediamine as functional monomers; and the prepared magnetic micro-particles can adsorb trace lead and cadmium ions so as to expand the application range of cobalt ferrites and mesoporous materials and improve the adsorption capacity and selectivity to lead and cadmium ions.

Description

technical field [0001] 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 technique [0002] Cadmium and lead are heavy metal elements with serious pollution and strong toxicity. In the natural environment, even extremely low concentrations will cause serious harm to human beings. Excessive intake of lead will inhibit the development of the brain and lead to chronic nephritis; lead-contaminated food will be enriched into the human body through the food chain, thereby causing harm to the human body. When the blood lead content reaches 2.9-3.86 μmol·L -1 Lead poisoning occurs when cadmium is present, and cadmium is carcinogenic; in addition, the accumulation of cadmium in the human body can lead to renal damage and impaired calcium and phosphorus regulation, resulting in bone decalcification, osteomalacia, and pathological fractures. However, sinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/30B01J20/26C02F101/20
CPCB01J20/06B01J20/268B01J20/28009B01J20/28016C02F2101/20
Inventor 谢春生韦寿莲陈丹
Owner ZHAOQING UNIV