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Preparation method of modified silica gel nano molecularly imprinted polymer for separation of saccharin sodium

A technology for imprinting polymers and nanomolecules, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of saccharin sodium separation methods that have not been reported, and achieve high reuse rate, short adsorption time, and high adsorption efficiency. Effect

Active Publication Date: 2016-06-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the separation method of sodium saccharin by nano-molecular imprinting

Method used

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  • Preparation method of modified silica gel nano molecularly imprinted polymer for separation of saccharin sodium
  • Preparation method of modified silica gel nano molecularly imprinted polymer for separation of saccharin sodium
  • Preparation method of modified silica gel nano molecularly imprinted polymer for separation of saccharin sodium

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specific Embodiment approach 1

[0019] Embodiment 1: The preparation method of the modified silica gel nano-molecularly imprinted polymer for separating saccharin sodium in this embodiment is carried out according to the following steps:

[0020] 1. Preparation of SiO 2 Nanoparticles: Add absolute ethanol, ammonia water and ultrapure water into the reaction vessel and stir evenly, then add ethyl orthosilicate drop by drop under the condition of magnetic stirring at a speed of 600r / min~800r / min, after the dropwise addition is completed , stirred at room temperature and at a speed of 600r / min to 800r / min for 20h to 24h to obtain a colloidal suspension, then centrifuged at a speed of 4500r / min to 5500r / min for 8min to 12min, collected the precipitate, and then used Wash the precipitate with water and ethanol for 3 to 5 times, then wash the precipitate with ultrapure water for 3 to 5 times, and then dry it under vacuum conditions at a temperature of 55 to 65°C to obtain SiO 2 Nanoparticles; the volume ratio of ...

specific Embodiment approach 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the volume ratio of absolute ethanol to ammonia water in Step 1 is 100:6. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the volume ratio of absolute ethanol to ultrapure water in step 1 is 100:11. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a process for preparing a modified silica nanometer molecularly imprinted polymer capable of separating saccharin sodium, aiming at solving the existing problem of no molecularly imprinted polymer capable of separating saccharin sodium. The process comprises the following steps: 1. preparation of SiO2 nanometer particles; 2. preparation of amino modified SiO2 nanometer particles; and 3. preparation of modified silica nanometer molecularly imprinted polymer. The modified silica nanometer molecularly imprinted polymer capable of separating saccharin sodium prepared according to the process has the maximal saturated adsorption capacity of 8.5-9.5 mg / g, high adsorption efficiency and short adsorption time of 180 minutes, still has 90 percent of the original adsorption efficiency after being stored under the ambience of nitrogen and high repeated utilization rate, and can be applied to the field of separation of saccharin sodium.

Description

technical field [0001] The invention relates to a preparation method of a molecularly imprinted polymer for separating saccharin sodium. Background technique [0002] Sodium saccharin is one of the oldest synthetic sweeteners, and its sweetness is 300 to 500 times that of sucrose. Sodium saccharin enters the human body, is not metabolized and absorbed by the human body, and is excreted with urine, with no nutritional value. Because saccharin sodium is harmful to human health, and studies have found that eating a large amount of saccharin sodium can cause bladder cancer, the national standard has strict requirements on its dosage. [0003] At present, the commonly used detection methods of saccharin sodium include high performance liquid chromatography and thin layer chromatography. The determination process of these two methods is complicated, the cost is high, and the separation efficiency is low. Therefore, it is very important to find a detection method with low price, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/38C08F2/44C08J9/26B01J20/26B01J20/30
Inventor 杨鑫赵凇黄微薇张敏
Owner HARBIN INST OF TECH