Cadmium ion imprinted adsorbent, and preparation method and application thereof

A technology of imprinted adsorption and cadmium ions, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems that have not been seen, achieve good stability, good reproducibility, and improve selectivity Effect

Inactive Publication Date: 2013-08-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the use of 4-vinylpyridine and methacrylic acid as functional monomers and ethylene glycol dimethacrylate as a crosslinking agent to synthesize cadmium ion imprinting adsorbents.

Method used

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  • Cadmium ion imprinted adsorbent, and preparation method and application thereof
  • Cadmium ion imprinted adsorbent, and preparation method and application thereof
  • Cadmium ion imprinted adsorbent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of cadmium ion imprinting adsorbent

[0018] (1) Add 1 mmol CdCl 2 , 2~4 mmol of methacrylic acid and 4-vinylpyridine functional monomers were dissolved in 15~20 mL of dimethyl sulfoxide solution, and the solution was magnetically stirred at room temperature for 1 h to form cadmium ion chelate;

[0019] (2) Dissolve 0.1~0.2 g of azobisisobutyronitrile and 20 mmol of ethylene glycol dimethacrylate in 2~3 mL of dimethyl sulfoxide solution. Under nitrogen protection, mix with the solution in step (1), and react in a water bath at 70°C for 24 h;

[0020] (3) The polymer formed in step (2) is first washed with ethanol, then washed with 2 M hydrochloric acid solution to remove template cadmium ions, and finally washed with deionized water twice until neutral, and dried in a drying oven for later use;

Embodiment 2

[0022] Effect of pH on Adsorption Performance of Cadmium Ion Imprinting Adsorbent

[0023] The absorption rate was measured by flame atomic absorption method (FAAS) through the static test of solutions with different pH values. figure 1 is the effect of pH on the adsorption performance of Cd(II) by cadmium ion imprinting adsorbent, the initial Cd(II) ion concentration: 1.0 mg / L; adsorbent dosage: 0.3g; shaking time: 30 min; temperature: 25°C; Sample volume: 100 mL.

Embodiment 3

[0025] Determination of maximum enrichment fold

[0026] The enrichment performance of Cu(II) by cadmium ion-imprinted adsorbent under different sample volume conditions was investigated by dynamic experiment method. In the experiment, 200, 400, 600, 800, 1000, 1200 and 1400 mL sample solutions containing 10 μg Cd(II) were enriched by column extraction under the optimal extraction and elution conditions, and then the Cd(II) The determination of the recovery rate was used to study the maximum enrichment factor. The results are shown in Table 1. When the sample volume increased to 1400 mL, the recovery rate of Cd(II) dropped to 84.5%. This shows that the cadmium ion imprinting adsorbent has a good extraction and enrichment ability for Cd(II). Since 8 mL of hydrochloric acid solution can achieve quantitative recovery of Cd(II), the maximum enrichment factor is 150, which is expected to realize the extraction and enrichment of Cd(II) in the sample solution. Extraction and enrich...

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Abstract

The invention discloses a cadmium ion imprinted adsorbent, and a preparation method and application thereof, belonging to the technical field of preparation adsorbing materials. The preparation method comprises the following steps: (1) forming a chelate from cadmium ions and functional monomers; (2) crosslinking the chelate into a polymer under the action of a crosslinking agent; and (3) washing the polymer with an eluate to remove the cadmium ions to form the cadmium ion imprinted adsorbent. The cadmium ion imprinted adsorbent disclosed by the invention is prepared by a mass polymerization method, and synthesizes a solid-phase extraction material by using methacrylic acid and 4-vinyl pyridine as the functional monomers and ethylene glycol dimethyl acrylate as the crosslinking agent; and the solid-phase extraction material has the advantages of high bonding firmness, stable properties, favorable reproducibility and high selectivity. The adsorbent can be used in enrichment pretreatment of trace amounts of Cd (II) in an ambient water sample.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation technology, and in particular relates to a cadmium ion imprinted adsorbent and a preparation method and application thereof. Background technique [0002] Cadmium is an important metal element in the production of alloys, batteries, dyes and electroplating materials, etc. However, the flow of industrial waste and wastewater containing cadmium into the environment will lead to environmental deterioration. Since the heavy metal cadmium is not easy to be biodegraded, cadmium can enter the human body through the food chain and the respiratory tract, settle and accumulate in the human body, and cause serious harm to human health, so the monitoring of metal cadmium is particularly important. In recent years, the methods used to detect the content of heavy metals in environmental water samples mainly include flame atomic absorption spectrophotometer (FAAS), graphite furnace atomic absorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/14C08F226/06C08F220/06C08J9/26B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 吕海霞安洪涛王晓明易娇娇谢增鸿
Owner FUZHOU UNIV
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