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Preparation method and application of hybrid membrane adsorbent for removing copper ions in water

A technology of copper ions and hybrid membranes, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve problems such as many reaction steps, poor stability, and poor temperature resistance

Inactive Publication Date: 2020-10-23
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chinese patent 201310098223.1 proposes a method for removing divalent copper ions in aqueous solution, which is to carry out graft copolymerization of chitosan and epichlorohydrin to cross-link chitosan chelating resin, and then cross-link chitosan and poly Hydroxyl aluminum cross-linked bentonite is used for intercalation treatment, and modified bentonite is used to adsorb divalent copper ions in aqueous solution; this method mainly uses modified bentonite composite materials to absorb copper ions, and the resin and bentonite are easy to separate and fall off, and the stability is poor. Disadvantages, its application value is limited
[0003] Chinese patent 200810034457.9 proposes a method for quickly removing metal copper ions in wastewater, which is to bond the activated nylon membrane with chitosan, and then modify it with epichlorohydrin to obtain a modified nylon membrane. Nylon membrane is used to adsorb copper ions; this method has the disadvantages of many reaction steps and complicated procedures, and its application value is limited
[0004] Chinese patent 201910710903.1 proposes an adsorbable Cu 2+ The preparation method of the novel film adsorbent of ions is to use dibenzo-18-crown-6 ether as raw material, mix diformyl dibenzo-18-crown-6 ether into chitosan, form a film adsorbent through acetal reaction, and then Adsorption and removal of metal copper ions; this method has many reaction steps, and is an organic film, and has disadvantages such as poor temperature resistance, and its application value is limited

Method used

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  • Preparation method and application of hybrid membrane adsorbent for removing copper ions in water
  • Preparation method and application of hybrid membrane adsorbent for removing copper ions in water
  • Preparation method and application of hybrid membrane adsorbent for removing copper ions in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for removing copper ions in water by a hybrid membrane adsorbent, the specific steps are as follows:

[0038] (1) the preparation of the PVA aqueous solution that mass percent concentration is 5%

[0039] Add 50g of polyvinyl alcohol (PVA) with an average degree of polymerization of 1750±50 to a 500mL container equipped with a stirrer, then add an appropriate amount of deionized water, and continuously stir the PVA and water in the container at a temperature of 90°C. Mix until the PVA is completely dissolved, continue to stir for 5 hours to obtain a solution, transfer the solution to a 1000mL volumetric flask after cooling, add a certain amount of deionized water, shake evenly, and then add an appropriate amount of deionized water until the solution reaches the capacity of the volumetric flask. until the scale is reached, then shake evenly to prepare 1000g of PVA aqueous solution with a concentration of 5% by mass.

[0040] (2) the preparation of the acetic ac...

Embodiment 2

[0059] Using the same experimental device, operating steps and the same ingredient ratio as in Example 1, the non-woven fabric is immersed in the above-mentioned coating solution after static degassing, and the coating film is dipped on the support non-woven fabric until a membrane is obtained. , the film and the non-woven fabric were placed together at room temperature for 24 hours, and then they were convectively dried in a blast drying oven at 60°C for 6 hours. After cooling, the film and the non-woven fabric were not separated and the tape was obtained. Hybrid membrane adsorbent with support nonwoven.

[0060] The hybrid membrane adsorbent prepared in this example was subjected to the experiment of adsorbing copper ions in 80mg / L copper ion solution, the results showed that: under the conditions of 25°C and pH=4, the hybrid membrane had no effect on Cu 2+ The adsorption capacity is 6.9 mg / g, which shows that the hybrid membrane adsorbent can adsorb and remove copper ions i...

Embodiment 3

[0063] Using the same experimental device, operating steps and the same ingredient ratio as in Example 1, first dissolve the coating solution with 30mL of solvent N,N-dimethylformamide (DMF), and then place the resulting substance on the support Salivate coating on a polytetrafluoroethylene plate (Teflon plate) until the diaphragm is obtained, let it stand at room temperature for 24 hours, then separate the diaphragm from the Teflon plate, dry the obtained diaphragm at 50°C for 3 hours, take it out and cool it naturally to The hybrid membrane adsorbent without support was obtained at room temperature.

[0064] The hybrid membrane adsorbent prepared in this example was subjected to an experiment of adsorbing copper ions in 80 mg / L copper ion solution. 2+ The adsorption capacity is 4.6 mg / g, which shows that the hybrid membrane adsorbent can adsorb and remove copper ions in aqueous solution.

[0065] To sum up: In this example, a hybrid membrane adsorbent without a support was ...

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Abstract

The invention discloses a preparation method and application of a hybrid membrane adsorbent for removing copper ions in water. The preparation method comprises the following steps: reacting a chitosan / epoxy chloropropane solution with a titanium-based precursor containing tetrabutyl titanate and acetylacetone to prepare a hybrid precursor, adding the obtained hybrid precursor into a polyvinyl alcohol aqueous solution to react, standing and defoaming the obtained substance to obtain a coating solution, coating a support with the coating solution to obtain a membrane, and drying to obtain the hybrid membrane adsorbent capable of being used for removing the copper ions in the water. When the hybrid membrane adsorbent is in use, firstly, copper-containing wastewater is introduced into an integrated membrane separator, and a cross-flow operation mode is adopted to adsorb and remove most of copper ions in the water in the plate-type membrane separator section; and trace copper ions in the water are removed in the section of a spiral-wound membrane separator. In the separation process, the hybrid membrane plays dual roles of an adsorbent and membrane filtration, has the advantages of short process flow, simplicity and convenience in operation, easiness in cleaning, good selectivity and the like, and can be used for purification treatment of copper-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a preparation method and application of a hybrid membrane adsorbent for removing copper ions in water. Background technique [0002] Chinese patent 201310098223.1 proposes a method for removing divalent copper ions in aqueous solution, which is to carry out graft copolymerization of chitosan and epichlorohydrin to cross-link chitosan chelating resin, and then cross-link chitosan and poly Hydroxyl aluminum cross-linked bentonite is used for intercalation treatment, and modified bentonite is used to adsorb divalent copper ions in aqueous solution; this method mainly uses modified bentonite composite materials to absorb copper ions, and the resin and bentonite are easy to separate and fall off, and the stability is poor. Disadvantages, its application value is limited. [0003] Chinese patent 200810034457.9 proposes a method for quickly removing metal copper ions in wastewa...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/44C02F101/20
CPCB01J20/24B01J20/28033C02F1/286C02F1/44C02F2101/20
Inventor 刘俊生江南廖晓霞侯丽娜胡科研李萌
Owner HEFEI UNIV
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