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Preparation method of hybrid film adsorbent for removing heavy metal ions in water

A technology of heavy metal ions and hybrid membranes, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes. It can solve the problems of easy degradation of chitosan, short service life of membrane adsorbents, and complicated preparation processes. , to achieve the effect of increasing adsorption and removal capacity, convenient use and regeneration, and simple preparation method

Active Publication Date: 2014-02-19
HEFEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chinese patent 201110268222.8 proposes a preparation method and application of a metal ion-imprinted chitosan cross-linked membrane adsorbent. Metal salts and chitosan are chemically pre-cross-linked to release amino groups, thereby preparing metal ion-imprinted chitosan cross-linked membranes. However, this method has the disadvantages of chitosan being easy to degrade, the service life of the membrane adsorbent is short, and the preparation process is complicated, and the cross-linked membrane adsorbent is formed into a film in a petri dish, so it is difficult to make a film for industrial use. Applied to large-scale industrial water treatment, so its application value is limited
[0003] Chinese patent 201010533375.6 proposes a membrane adsorbent that effectively removes heavy metal ions in drinking water and its preparation method. The membrane adsorbent is prepared by blending polymers and cation exchange resins; the membrane adsorbent prepared by this method has groups The type cannot be adjusted, the micron-sized resin particles are large, there is a phase separation phenomenon, and the polymer and the resin are easy to peel off, the film-forming stability and the uniformity of the film are poor, so it cannot be applied to large-scale industrial water treatment.
Since the pervaporation alcohol-permeable hybrid membrane does not contain functional groups that can dissociate in water, and the hybrid membrane itself does not have charge characteristics, it cannot be used for the treatment of non-volatile positively charged heavy metal ions in water. Adsorption separation, so its application value is limited
[0005] So far, there is no report on the use of hybrid membrane adsorbents for the removal of heavy metal ions in water

Method used

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  • Preparation method of hybrid film adsorbent for removing heavy metal ions in water
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1. Prepare a hybrid membrane adsorbent for removing heavy metal ions in water with the mass ratio of reactants: polyvinyl alcohol: formaldehyde: silane coupling agent = 10:1:1

[0023] First, add 10 g of polyvinyl alcohol (PVA) with a relative molecular weight of 1750 and 90 mL of water to a 500 mL container equipped with a stirrer to prepare an aqueous solution of polyvinyl alcohol (PVA) with a concentration of 10% by mass. The experimental process is as follows: in an air or nitrogen atmosphere, at a temperature of 90 ° C, the mixture of polyvinyl alcohol (PVA) and water in the container is continuously stirred until the PVA is completely dissolved, and then 2.7 mL of formaldehyde with a concentration of 37% by mass is added. The solution is used as a cross-linking agent for the cross-linking reaction; in order to speed up the cross-linking reaction, add 1 mL of dilute hydrochloric acid with a concentration of 0.1M to promote the cross-linking reaction, continu...

Embodiment 2

[0030] Example 2. Prepare a hybrid membrane adsorbent for removing heavy metal ions in water with the mass ratio of reactants: polyvinyl alcohol: formaldehyde: silane coupling agent = 10:1:1

[0031] Using the same experimental device, operating steps and the same batching ratio as in Example 1, the above-mentioned standing defoaming substance is slowly poured onto a clean and dry glass plate to scrape the film, and placed at room temperature for 24h, and then the Put it in a constant temperature drying oven, convectively dry it at 0°C for 24 hours, and remove the membrane from the glass plate after cooling in the air to obtain a hybrid membrane adsorbent that does not contain a support and can be used to remove heavy metal ions in water.

[0032] The experimental results show that: at 45°C and pH=3, its effect on Pb 2+ The adsorption capacity is 0.68mmol / g; under the condition of 45℃ and pH=4, its 2+ The adsorption capacity is 0.79mmol / g, which shows that the hybrid membrane...

Embodiment 3

[0034] Example 3. Prepare a hybrid membrane adsorbent for removing heavy metal ions in water with the mass ratio of reactants: polyvinyl alcohol: acetaldehyde: silane coupling agent = 1: 0.01: 1

[0035] Using the same device and operating steps as in Example 1, under the temperature condition of 0°C, 1g of polyvinyl alcohol (PVA) with a relative molecular weight of 1750 was dissolved in 999mL of water until the PVA was completely dissolved, and the mass percentage concentration of the preparation was 0.1% polyvinyl alcohol (PVA) aqueous solution. Then add 0.25mL of acetaldehyde solution with a mass percentage concentration of 4% as a crosslinking agent to carry out the crosslinking reaction; then add 1mL of dilute sulfuric acid with a concentration of 0.01M to promote the crosslinking reaction, and continue stirring for 18h to obtain a solution. Then gradually add 1g of silane coupling agent γ-aminopropyltriethoxysilane (KH-550 for short) to the solution, carry out sol-gel re...

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Abstract

The invention discloses a preparation method of a hybrid film adsorbent for removing heavy metal ions in water. The preparation method is characterized in that: in an inert atmosphere or in air, at 0 ~ 150 DEG C, a crosslinking agent as a reactant is added into a polyvinyl alcohol water solution with the mass percent concentration of 0.1% ~ 10%, and the mass ratio of polyvinyl alcohol: crosslinking agent is 1:0.01 ~ 0.1, under the effects of a dilute acid with the molar concentration of 0.001-0.1M, a cross-linking reaction is performed to obtain a solution, a silane coupling agent is added into the solution, and the mass ratio of polyvinyl alcohol (PVA): silane coupling agent is 1:0.1-1.0, a sol-gel reaction is performed to obtain a product, the product is statically stood for defoaming, and then is coated with a film to obtain a film sheet, and the obtained film sheet is dried to obtain the hybrid film adsorbent for removing the heavy metal ions in the water. The hybrid film adsorbent prepared by the preparation method is good in film forming performance, has strong adsorption selectivity to Pb<2+>, Cu<2+> and other heavy metal ions in the water, and can be used for adsorption and removal of the heavy metal ions in the water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for preparing a hybrid membrane adsorbent for removing heavy metal ions in water by utilizing sol-gel reaction. Background technique [0002] Chinese patent 201110268222.8 proposes a preparation method and application of a metal ion-imprinted chitosan cross-linked membrane adsorbent. Metal salts and chitosan are chemically pre-cross-linked to release amino groups, thereby preparing metal ion-imprinted chitosan cross-linked membranes. However, this method has the disadvantages of chitosan being easy to degrade, the service life of the membrane adsorbent is short, and the preparation process is complicated, and the cross-linked membrane adsorbent is formed into a film in a petri dish, so it is difficult to make a film for industrial use. It is used in large-scale industrial water treatment, so its application value is limited. [0003] Chinese patent 201010533375....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 刘俊生张晓敏徐玉全王凯胡科研
Owner HEFEI UNIV
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