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Method for preparing LDHs/PVA composite fiber membrane based on electrostatic spinning method and application

A technology of composite fiber membrane and electrospinning method, applied in chemical instruments and methods, alkali metal compounds, water/sewage treatment, etc.

Inactive Publication Date: 2016-03-23
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many kinds of hydrotalcite materials, the composite membrane made of it has strong adsorption capacity for heavy metal ions in wastewater, but the surface area of ​​the composite membrane after film formation is limited, which affects the adsorption capacity.

Method used

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  • Method for preparing LDHs/PVA composite fiber membrane based on electrostatic spinning method and application
  • Method for preparing LDHs/PVA composite fiber membrane based on electrostatic spinning method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of LDHs / PVA electrospinning solution

[0036] (1) Prepare 4.0MMgCl 2 aqueous solution and 1.0MAlCl 3 100mL of the aqueous solution, respectively recorded as solution A and solution B; take 0.10mol of sodium ethylenediamine tetraacetate fully dispersed in distilled water, recorded as solution C;

[0037] (2) Add solution A and solution B to solution C dropwise under the condition of nitrogen protection and constant stirring of solution C;

[0038] (3) After the dropwise addition, adjust the pH value to 9.0 with a 20% NaOH solution by mass ratio, react for 60 minutes, and obtain the sample; place the sample at 80°C for 12 hours;

[0039] (4) Wash the aged sample with distilled water until the pH of the final filtrate is 7, filter, and vacuum-dry the obtained filter cake at a temperature range of 80°C for 8 hours, crush it, and pass it through a 200-mesh sieve to obtain ethylenediaminetetra Acetate intercalated hydrotalcite;

[0040](5) Add 2g of PVA to ...

Embodiment 2

[0050] 1. Preparation of LDHs / PVA electrospinning solution

[0051] (1) Prepare 2.0MZn(NO 3 ) 2 aqueous solution and 1.0MFe(NO 3 ) 3 0.1L aqueous solution, recorded as solution A and solution B; take 0.15 mol of sodium tartrate fully dispersed in distilled water, recorded as solution C;

[0052] (2) Add solution A and solution B to solution C dropwise under the condition of nitrogen protection and constant stirring of solution C;

[0053] (3) After the dropwise addition, adjust the pH value to 8.0 with a 20% NaOH solution by mass ratio, react for 45 minutes, and obtain the sample; place the sample at 80°C for 14 hours;

[0054] (4) Wash the aged sample with distilled water until the pH of the final filtrate = 7, filter, and vacuum-dry the obtained filter cake at a temperature range of 80°C for 6 hours, crush it, and pass it through a 150-mesh sieve to obtain sodium tartrate intercalation Hydrotalcite;

[0055] (5) Weigh 3g of PVA and add it to 30g of de-distilled water, ...

Embodiment 3

[0063] 1. Preparation of LDHs / PVA electrospinning solution

[0064] (1) Prepare 4.0MFe(NO 3 ) 2 aqueous solution and 1.0MCo(NO 3 ) 3 0.1L of aqueous solution, recorded as solutions A and B; take 20mol of sodium citrate fully dispersed in distilled water, recorded as solution C;

[0065] (2) Add solution A and solution B to solution C dropwise under the condition of nitrogen protection and constant stirring of solution C;

[0066] (3) After the dropwise addition, use 20% NaOH solution and 1M nitric acid to adjust the pH value to 9.5, react for 90 minutes, and obtain the sample; place the sample at 80°C for 12 hours;

[0067] (4) Wash the aged sample with distilled water until the pH of the final filtrate = 7, filter, and vacuum-dry the obtained filter cake at a temperature range of 80°C for 10 hours, crush it, and pass it through a 200-mesh sieve to obtain citric acid intercalation Hydrotalcite;

[0068] (5) Add 2.5g of PVA to 27g of distilled water, and stir vigorously t...

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Abstract

The invention relates to a method for preparing an LDHs / PVA composite fiber membrane based on an electrostatic spinning method and application. According to the method, firstly, a bivalent nitrate or chlorate aqueous solution A, a trivalent nitrate and chlorate aqueous solution B and an organic salt aqueous solution C are respectively prepared; the aqueous solution A and the aqueous solution B are dropwise added into the aqueous solution C at the same time; reaction continues after the pH value is adjusted to be 8.0-12.0; washing and filtering are performed after aging is performed for 10-18 h, a filter cake is obtained, and heavy metal ion chelating agent intercalated hydrotalcite is obtained after vacuum drying, smashing and screening; PVA and distilled water are mixed, and a PVA solution is obtained; the heavy metal ion chelating agent intercalated hydrotalcite is added into the PVA solution to be uniformly mixed, and an LDHs / PVA hydrotalcite electrostatic spinning solution is obtained; the LDHs / PVA composite fiber membrane is prepared through electrostatic spinning. The fiber membrane is soaked into heavy metal ion waste water, and the adsorption rate can reach 30-90%.

Description

technical field [0001] The invention belongs to the technical field of composite membrane materials, and in particular relates to a method and application for preparing LDHs / PVA composite fiber membranes based on an electrospinning method. technical background [0002] With the development of industrial production and urban modernization, a large amount of waste water is discharged, the accumulation of heavy metals in water sources is intensified, and heavy metal pollution is serious. Therefore, the effective removal of heavy metals in wastewater has become an urgent task. At present, the treatment methods of heavy metal wastewater mainly include chemical precipitation, electrochemical method, adsorption method and membrane separation method. Among them, the adsorption method has the advantages of high efficiency, simplicity and good selectivity, especially for the heavy metal wastewater which is highly polluting and difficult to be effectively treated by other methods. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/26B01J20/02B01J20/28035C02F1/285C02F2101/20
Inventor 陈鸿邹来昌凌启淡衷水平伍赠玲章文贡陈良哲
Owner FUJIAN NORMAL UNIV
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