Preparation method for LDHs/PVA composite membrane and application of LDHs/PVA composite membrane in heavy metal wastewater

A composite membrane, heavy metal ion technology, used in alkali metal compounds, water/sewage treatment, chemical instruments and methods, etc.

Active Publication Date: 2016-02-24
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary adsorbents have the problem of separation and recovery difficulties, and traditional filtration methods easily lead to the loss of adsorbent materials

Method used

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  • Preparation method for LDHs/PVA composite membrane and application of LDHs/PVA composite membrane in heavy metal wastewater
  • Preparation method for LDHs/PVA composite membrane and application of LDHs/PVA composite membrane in heavy metal wastewater
  • Preparation method for LDHs/PVA composite membrane and application of LDHs/PVA composite membrane in heavy metal wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation of LDHs / PVA composite membrane

[0034] (1) Prepare 4.0MMg (NO 3 ) 2 aqueous solution and 1.0MAl(NO 3 ) 3 0.1L of the aqueous solution, which is recorded as solution A and B respectively; 0.10 mol of sodium ethylenediamine tetraacetate is fully dispersed in distilled water, which is recorded as solution C;

[0035] (2) Add solution A and solution B to solution C dropwise under the condition of nitrogen protection and constant stirring of solution C;

[0036] (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;

[0037] (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;

[0038] (5) Ad...

Embodiment 2

[0049] 1. Preparation of LDHs / PVA composite membrane

[0050] (1) Prepare 3.0MZn(NO 3 ) 2 aqueous solution and 1.0MFe(NO 3 ) 3 0.1L of aqueous solution, recorded as solution A and solution B; take 0.20 mol of sodium tartrate fully dispersed in distilled water, recorded as solution C;

[0051] (2) Add solution A and solution B to solution C dropwise under the condition of nitrogen protection and constant stirring of solution C;

[0052] (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;

[0053] (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 6 hours, crush it, and pass it through a 150-mesh sieve to obtain ethylenediaminetetra Acetic acid intercalated hydrotalcite;

[0054] (5) Weigh 3g of PVA and add it to 30g of de-dis...

Embodiment 3

[0061] 1. Preparation of LDHs / PVA composite membrane

[0062] (1) Prepare 2.0MFe(NO 3 ) 2 aqueous solution and 1.0MCo(NO 3 ) 3 0.1L of the aqueous solution, recorded as solutions A and B; take 0.15 mol of sodium citrate fully dispersed in distilled water, recorded as solution C;

[0063] (2) Add solution A and solution B to solution C dropwise under the condition of nitrogen protection and constant stirring of solution C;

[0064] (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;

[0065] (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;

[0066] (5) Add 2.5g of PVA to 27g of distilled water, and stir vigorously ...

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Abstract

The invention belongs to the technical field of composite membrane materials, and particularly relates to a preparation method for a layered double hydroxides composite material and an application of the layered double hydroxides composite material in heavy metal wastewater. The preparation method comprises the steps of: by adopting a coprecipitation method, firstly preparing a nitrate or chlorate aqueous solution A of divalent metal cations M<2+> and a nitrate or chlorate aqueous solution of trivalent metal cations M<3+>, and adding an aqueous solution C wherein organic salt of a heavy metal ion chelating agent is fully dispersed; obtaining layered double hydroxides of the heavy metal ion chelating agent through aging, vacuum drying, crushing and sieving; and mixing the layered double hydroxides with PVA to prepare a membrane and then preparing an LDHs / PVA composite membrane. As a composite membrane adsorbing material is soaked into heavy metal wastewater containing Cu<2+>, Cd<2+> or Pb<2+>, the adsorption rate can reach 92%. The method provided by the invention is mild in preparation condition and low in cost and has a good application prospect.

Description

Technical field [0001] The invention is a composite film material technology, especially the preparation method of a water talc composite material and it is used in heavy metal wastewater. technical background [0002] With the development of industrial production and urban modernization, a large amount of wastewater is discharged, heavy metals in water sources have intensified, and heavy metal pollution is serious.Therefore, effectively removing heavy metals in wastewater has become an urgent task.At present, the treatment methods of heavy metal wastewater are chemical precipitation, electrochemical method, adsorption method, and membrane separation method.Among them, the adsorption method has the advantages of efficient, simple and selective, especially for heavy metal wastewater that is strongly polluted and difficult to handle in other methods.However, there are problems with separation and recycling difficulties in ordinary adsorbents, and traditional filtering methods can e...

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
CPCB01J20/223B01J20/261B01J20/28035B01J20/30C02F1/285C02F1/288C02F2101/20
Inventor 陈鸿凌启淡邹来昌衷水平伍赠玲章文贡陈良哲
Owner FUJIAN NORMAL UNIV
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