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Preparation method of cadmium ion surface imprint adsorbing material

A technology of surface imprinting and adsorption materials, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc. It is difficult to identify problems such as site binding, and achieve the effects of high elution efficiency, high mechanical strength, and easy control.

Inactive Publication Date: 2013-03-27
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional imprinted polymer is prepared by embedding method, which requires simple equipment and strong universality, but has the following disadvantages: the obtained imprinted polymer is blocky, and the imprinting efficiency is not high; crushing, grinding and sieving The process of obtaining imprinted polymer particles is relatively complicated; and many imprinted holes are destroyed, resulting in a limited number of imprinted holes in the particles, and the binding performance of template (molecular) ions is not high; in addition, by block imprinted polymerization The material is the particles obtained from the precursor, the matrix is ​​thicker, the pores of the holes are deeper, the diffusion resistance of the template (molecular) ions is large, the mass transfer speed is slow, and it is not easy to combine with the recognition site

Method used

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  • Preparation method of cadmium ion surface imprint adsorbing material
  • Preparation method of cadmium ion surface imprint adsorbing material

Examples

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example 1

[0016] Example 1: Put 0.1 g of functional grafted particles HQ-PHEMA / SiO2 (the degree of grafting of PHEMA is 40 g / 100 g, the bonding density of HQ is 1.85 mmol / g) in 500 mL of 0.01 mol / L Cd 2+ In the ionic water solution, adjust the pH value of the solution system with dilute sodium hydroxide solution to make pH = 5.5, place the mixed solution in a constant temperature oscillator, and shake at a constant temperature for 4 h to make the functional grafted particles HQ-PHEMA / SiO 2 to Cd 2+ The adsorption of ions reaches saturation, and the particles are filtered out and dried in vacuum. 0.5 g of saturated adsorbed Cd 2+ Ionically functional grafted microparticles placed in Cd-containing 2+ ions (0.01mol / L) in a mixed solvent of water and ethanol (the volume ratio of water and ethanol is 7:3), adjust the pH value of the system with dilute NaOH solution to make pH = 5.5, add 5 mL of dichloro Aqueous diethyl ether solution (1%) was stirred at 45°C for 24 h for the cross-linkin...

example 2

[0017] Example 2: 0.1 g of functional grafted particles HQ-PHEMA / SiO 2 （ The degree of grafting of PHEMA is 30 g / 100 g, and the bonding density of HQ is 1.75 mmol / g) placed in 500 mL of Cd with a concentration of 0.01 mol / L 2+ In the ionic water solution, adjust the pH value of the solution system with dilute sodium hydroxide solution to make pH = 5.5, place the mixed solution in a constant temperature oscillator, and shake at a constant temperature for 4 h to make the functional grafted particles HQ-PHEMA / SiO 2 to Cd 2+ The adsorption of ions reaches saturation, and the particles are filtered out and dried in vacuum. 0.5 g of saturated adsorbed Cd 2+ Ionically functional grafted microparticles placed in Cd-containing 2+ ions (concentration of 0.01mol / L) in a mixed solvent of water and ethanol (volume ratio of water and ethanol is 7:3), use dilute NaOH solution to adjust the pH value of the system to pH = 5, add 4 mL of dichloro Aqueous diethyl ether solution (1%) was sti...

example 3

[0018] Example 3: 0.1 g of functional grafted particles HQ-PHEMA / SiO 2 （ The degree of grafting of PHEMA is 35 g / 100 g, and the bonding density of HQ is 1.8 mmol / g) placed in 500 mL of Cd with a concentration of 0.01 mol / L 2+ In the ionic water solution, adjust the pH value of the solution system with dilute sodium hydroxide solution to make pH = 5.5, place the mixed solution in a constant temperature oscillator, and shake at a constant temperature for 4 h to make the functional grafted particles HQ-PHEMA / SiO 2 to Cd 2+ The adsorption of ions reaches saturation, and the particles are filtered out and dried in vacuum. 0.5 g of saturated adsorbed Cd 2+ Ionic functional particles placed in the Cd-containing 2+ ions (concentration of 0.01mol / L) in a mixed solvent of water and ethanol (the volume of water and ethanol is 7:3), adjust the pH value of the system with dilute NaOH solution to make pH = 4.5, add 6 mL of dichloro Aqueous diethyl ether solution (1%) was stirred at 50°...

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Abstract

The invention relates to a preparation method of an adsorbing material of metal ions in a water system and particularly relates to a preparation method of a cadmium ion surface imprint adsorbing material. The preparation method comprises the steps of placing functional grafting particles HQ-PHEMA (Hydroxyquinoline-Poly Hydroxyethyl Methylacrylate) / SiO2 into a Cd<2+> ion water solution with the concentration of 0.01 mol / L; adjusting the pH (Potential of Hydrogen) value of a solution system to 5.5 with a sodium hydroxide solution; placing the solution into a constant-temperature oscillator to carry out constant-temperature oscillation; filtering the particles and drying in vacuum; placing the functional grafting particles which are adsorbed with Cd<2+> ions in a saturated manner into a water and ethanol mixed solvent containing the Cd<2+> ions; utilizing the sodium hydroxide solution to adjust the pH value of the system; taking dichloroether as a cross-linking agent to react under the condition that the temperature is 40-50 DEG C for 20-26 hours to form a cross-linking imprint; utilizing a hydrochloric acid solution to repeatedly wash the product to remove template ions, namely the Cd<2+> ions; and drying in vacuum to form the Cd<2+> ion surface imprint adsorbing material.

Description

technical field [0001] The invention relates to a preparation method of an adsorption material for metal ions in a water system, in particular to a preparation method for a cadmium ion surface imprinted adsorption material. Background technique [0002] Heavy metal cadmium is a harmful source of environmental pollution. It not only affects the growth and development of crops, but also endangers human health through bioaccumulation and eventually through the food chain. Long-term intake of excessive cadmium will affect the absorption of other beneficial elements in the human body. Cause endocrine disorders, loss of appetite, insomnia, high blood pressure and other problems. Cadmium poisoning can lead to osteoporosis, softening and deformation of bones, fractures and even death. In addition, cadmium is also a carcinogen. The International Agency for Research on Cancer (IARC) classifies cadmium as a class I carcinogen, and the US Poison Control Council lists cadmium as the si...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62C08J9/28
Inventor 高保娇门吉英王蕊欣李延斌雷青娟
Owner ZHONGBEI UNIV
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