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Method for preparing magnetic nano-composites and removing phenols pollutants in water

A magnetic nano-composite technology, which is applied in chemical instruments and methods, alkali metal compounds, water/sewage treatment, etc., can solve the problems of imperfect synthesis methods, low adsorption efficiency, and low reuse rate, and achieve excellent adsorption ability, simple preparation method, and the effect of saving economic cost

Inactive Publication Date: 2015-02-18
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis methods of most adsorbents are not perfect, the adsorption efficiency is not high, and the reuse rate is low.

Method used

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  • Method for preparing magnetic nano-composites and removing phenols pollutants in water
  • Method for preparing magnetic nano-composites and removing phenols pollutants in water
  • Method for preparing magnetic nano-composites and removing phenols pollutants in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Carboxymethyl-β-cyclodextrin polymer functionalized Fe 3 o 4 Preparation of magnetic nanocomposites (CMCDP-MNPs)

[0023] (1) Preparation of carboxymethyl-β-cyclodextrin polymer (CMCDP): 4.5g β-cyclodextrin and 8.73g sodium chloroacetate were dissolved in 20mL, 2.5mol / L sodium hydroxide solution, 80 After heating and stirring at ℃ for 3 hours, cool to room temperature, add 5 mL of epichlorohydrin to the mixed solution, stir vigorously for 8 hours, then add 5 mL of epichlorohydrin, and continue stirring for 24 hours to stop the reaction. Add an appropriate amount of absolute ethanol to the mixture to produce a white precipitate, continue to add absolute ethanol until the white precipitate no longer occurs, filter, wash the precipitate with absolute ethanol several times, and finally dry the white precipitate at 50°C in vacuum to obtain CMCDP.

[0024] (2) Preparation of CMCDP-MNPs: 2.35g FeCl 3 ·6H 2 O, 0.89FeCl 2 4H 2 0, 2.0g of the CMCDP prepared in s...

Embodiment 2

[0026] Example 2: Adsorption of bisphenol A by CMCDP-MNPs

[0027] Add 10 mg of CMCDP-MNPs to 50 mL, 5-30 mg / L bisphenol A aqueous solution, adjust the pH of the solution to 5, shake at room temperature for 4 hours, and measure the fluorescence of the supernatant on a Cary Eclipse fluorescence spectrophotometer after magnetic separation Intensity (λex=274nm, λem=307nm), and calculate the adsorption amount Q of CMCDP-MNPs to bisphenol A by formula 1 e (mg / g):

[0028] Q e =(C 0 -C e )V / m (1)

[0029] where C 0 is the initial concentration of bisphenol A (mg / L), C e is the residual concentration of bisphenol A (mg / L), V is the solution volume (L), m is the mass of CMCDP-MNPs (g)

[0030] The experiment was repeated three times, and the average value was calculated. The result is as Figure 4 shown. The maximum adsorption capacity of CMCDP-MNPs to bisphenol A was 62mg / g.

Embodiment 3

[0031] Example 3: Adsorption of Resorcinol by CMCDP-MNPs

[0032]Add 10 mg of CMCDP-MNPs to 50 mL, 5-30 mg / L resorcinol aqueous solution, adjust the pH of the solution to 5, shake at room temperature for 4 h, and measure the concentration of the supernatant on a Cary Eclipse fluorescence spectrophotometer after magnetic separation. Fluorescence intensity (λex=272nm, λem=305nm), and calculate the adsorption amount Q of CMCDP-MNPs p-resorcinol by formula 2 e (mg / g):

[0033] Q e =(C 0 -C e )V / m (2)

[0034] where C 0 is the initial concentration of resorcinol (mg / L), C e is the residual concentration of resorcinol (mg / L), V is the solution volume (L), m is the mass of CMCDP-MNPs (g)

[0035] The experiment was repeated three times, and the average value was calculated. The result is as Figure 5 shown. The maximum adsorption capacity of CMCDP-MNPs to resorcinol was 84mg / g.

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Abstract

The invention aims to provide a method for preparing magnetic nano-composites and removing phenols pollutants in water. The method for preparing the composites comprises the step of preparing the magnetic nano-composites by using iron chloride hexahydrate, ferrous chloride tetrahydrate and carboxymethyl-beta-cyclodextrin polymers as raw materials. The method for removing the phenols pollutants in water comprises the following steps: adding the magnetic nano-composites to an aqueous solution containing the phenols pollutants, regulating the pH of the solution to 5, and oscillating the solution for 4 hours at the room temperature, as a result, the phenols pollutants in the water can be effectively adsorbed and removed. After the adsorption is completed, an adsorbing agent in an external magnetic field is separated and recovered, and finally the magnetic nano-composites which are recovered are desorbed and regenerated to be reused for adsorbing the phenols pollutants. By the method, the phenols pollutants in the water can be effectively removed, the operation is simple, secondary pollution is avoided, and the adsorbing agent is easy to separate and recycle to be reused.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method of a magnetic nanocomposite and a method for removing phenolic pollutants in water by using the prepared compound. Background technique [0002] Phenolic compounds are a class of persistent organic pollutants with high toxicity and refractory degradation. They are environmentally persistent, bioaccumulative, long-distance migration and biohazardous, and can cause endocrine disorders, reproductive and immune dysfunction, neurological Behavioral and developmental disorders, and has triple (teratogenic, carcinogenic, mutagenic) effects. With the rapid economic development, the usage of phenolic compounds is increasing year by year. It widely exists in coking, plastics, dyes, medicines, spices and pesticides and other industrial wastewater. Among the 129 priority pollutants issued by the US Environmental Protection Agency (EPA), there are 11 kinds of ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/58
CPCB01J20/26B01J20/28009B01J20/30B01J2220/4812C02F1/285C02F1/58
Inventor 孙琳琳周叶红双少敏王斐董川
Owner SHANXI UNIV
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