Preparation and Application of Alkylphenol Composite Template Molecularly Imprinted Polymer Modified Magnetic Graphene Oxide

A composite template, molecular imprinting technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., to accelerate the sample pretreatment process, improve sensitivity, and fast adsorption rate.

Active Publication Date: 2021-02-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of this invention is to develop a new material and corresponding technology for the simultaneous adsorption and removal of alkylphenols with large adsorption capacity, high selectivity, short adsorption equilibrium time and low processing cost in view of some problems existing in the existing materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Graphene oxide (GO) was prepared by the improved Hummer method. Weigh 5.0g graphite powder (carbon content > 98wt%) and 2.5gNaNO 3, mixed in 98% concentrated H in an ice-water bath with constant stirring 2 SO 4 (250mL), slowly add 35g KMnO 4 , control the temperature of the mixture not to exceed 10°C, and after 2 hours of low-temperature reaction, keep the temperature at about 35°C for 2 hours. Then 240 mL of deionized water was added dropwise, and when the temperature of the solution reached 90° C., the reaction was continued for 40 min. After the reaction was completed, it was cooled to room temperature, and the obtained bright yellow suspension was diluted with 500 mL of deionized water, and hydrogen peroxide (30%) was added until no bubbles were formed. The product was washed successively with a 10-fold diluted HCl solution and acetone, and dried under vacuum at 80°C.

[0028] (2) Magnetic graphene oxide (MGO) was prepared by chemical co-precipitation metho...

Embodiment 2

[0033] Carry out various index experiments to the material obtained in Example 1.

[0034] 20 mg of the material obtained in Example 1 was added to 20 mL of solutions containing 50 mg / L bisphenol A, octylphenol, and nonylphenol at different pH values ​​to investigate the effect of pH value on the adsorption effect. The results showed that the adsorption capacity was the largest when the pH was around 6.

[0035] Add 20 mg of the material obtained in Example 1 to 20 mL of a pH=6 solution containing 50 mg / L bisphenol A, octylphenol, and nonylphenol to investigate the effect of adsorption time on the adsorption effect. The results showed that within 30 minutes, the adsorption reached equilibrium, and the adsorption process obeyed the second-order kinetics.

[0036] 20 mg of the material obtained in Example 1 was added to solutions with different initial concentrations, and adsorbed in a constant temperature oscillator at 25°C for 60 minutes to study the variation of the adsorpti...

Embodiment 3

[0039] The material obtained in Example 1 is used for the adsorption and removal of bisphenol A, octylphenol and nonylphenol in environmental water.

[0040] Add 20 mg of the material to 50 mL of a solution containing 20 mg / L bisphenol A, octylphenol, and nonylphenol, adjust the pH to 6, and shake at 200 rpm for 30 minutes. The adsorbent is separated from the solution under the action of an external magnetic field. The concentrations of residual bisphenol A, octylphenol and nonylphenol in the solution were determined by high performance liquid chromatography, and the removal rates of bisphenol A, octylphenol and nonylphenol were calculated. The bisphenol A, octylphenol and nonylphenol adsorbed by the material were eluted with methanol: acetic acid (9:1, V:V) mixed solution.

[0041] The material can be reused 5 times.

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Abstract

The invention relates to the preparation of an alkylphenol (including bisphenol A, octylphenol and nonylphenol) composite template molecularly imprinted polymer and its application in the removal and analysis of alkylphenols. Graphene oxide was prepared by the improved Hummer method, and ferric oxide particles were loaded on its surface, covered with mesoporous silicon, and then double bonds were grafted. Using the obtained material as a carrier, bisphenol A, octylphenol, and nonylphenol are jointly used as template molecules, and 4-vinylbenzoic acid, ethylene glycol dimethacrylate, and 2,2'-azobisisobutyronitrile are respectively used as template molecules. Functional monomers, cross-linking agents and initiators, polymerized at 60°C. The template molecule was eluted with methanol: acetic acid (9:1, V:V) mixture, and dried in vacuum to obtain an alkylphenol composite template molecularly imprinted polymer. The material combines the specific recognition of molecular imprinting and the easy separation of magnetic materials, and can selectively adsorb bisphenol A, octylphenol, and nonylphenol in water at the same time, with adsorption capacities of 16.81, 35.97, and 61.73 mg / g, reaches adsorption equilibrium within 30 minutes, can be reused more than 5 times, and can be used for the removal and detection of alkylphenols.

Description

technical field [0001] The invention belongs to the technical field of novel environmental functional materials, water treatment and detection, and in particular relates to a preparation and application method of an alkylphenol composite template molecularly imprinted polymer-modified magnetic graphene oxide. Background technique [0002] Alkylphenols such as bisphenol A (BPA), nonylphenol (NP) and octylphenol (OP) belong to the category of environmental estrogens, which have estrogen effects, can disrupt the endocrine function of organisms, and have potential Cancer Risk. At present, such substances have been detected in environmental water samples, fish and shrimp, meat and meat products, milk and grains and other foods. Therefore, it is of great significance to develop efficient alkylphenol removal technology and sensitive alkylphenol detection method. [0003] Alkylphenols are often present in reduced amounts in environmental water samples, and chemical and physical me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F212/14C08J9/26B01J20/26B01J20/28B01D15/08B01J20/30
CPCB01D15/08B01J20/20B01J20/268B01J20/28009C08F292/00C08J9/26C08J2201/0422C08J2351/10C08F212/14
Inventor 马晓国谢晓纹郭丽慧
Owner GUANGDONG UNIV OF TECH
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