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Preparation method of hybrid absorbent used for removing heavy metal nickel ions in water

A technology for removing water and adsorbents, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc. Short service life and other problems, to achieve the effect of improving the removal effect, simple preparation method, high temperature resistance

Active Publication Date: 2015-08-26
HEFEI UNIV
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Problems solved by technology

[0002] Chinese patent 2011102562141 proposes a method for preparing a flat membrane for sewage treatment, using the method of blending PVDF and attapulgite to prepare an organic-inorganic hybrid flat membrane, but the quality of PVDF and attapulgite prepared by this method When the ratio is 1:0.01, the adsorption rate of the hybrid membrane to nickel ions is close to 20%. The flat membrane prepared by this method has the disadvantages of low adsorption efficiency of the hybrid flat membrane and short service life of the flat membrane, so it cannot be applied to large-scale industrial water treatment. processing, so its application value is limited
[0003] Chinese patent 2011102541060 proposes a method for preparing a PVDF hybrid flat membrane that absorbs heavy metal ions. The organic-inorganic hybrid flat membrane is prepared by blending PVDF and attapulgite, but the PVDF and attapulgite prepared by this method When the mass ratio of the hybrid membrane is 1:0.01, the adsorption rate of nickel ions is only close to 20%. The hybrid flat membrane prepared by this method has the disadvantages of low adsorption efficiency and short service life, and cannot be applied to large-scale industrial water treatment. , so its application value is limited
[0004] So far, there has been no report on the use of sol-gel method to prepare hybrid adsorbents for the removal of heavy metal nickel ions in water

Method used

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  • Preparation method of hybrid absorbent used for removing heavy metal nickel ions in water

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1. prepares the hybrid adsorbent for removing heavy metal nickel ions in water with the reactant volume ratio silane coupling agent: epichlorohydrin=4:1

[0032] First put a clean beaker on a magnetic stirrer, in an air or nitrogen atmosphere, at a temperature of 25°C (usually the reaction temperature is 0-100°C, and in this embodiment, it is selected at a room temperature of 25°C) , add 4mL of silane coupling agent N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (abbreviated as A-1120) into the beaker, then add 1mL of epichlorohydrin solution dropwise, continuously Stir to make them carry out sol-gel reaction at 25°C for 4h, continue to stir for 20h to obtain the sol-gel reaction product (usually the sol-gel reaction time is 1-48h, in order to make the reaction more complete, the present embodiment The sol-gel reaction has been carried out for 24h); the sol-gel reaction product was cooled and left to defoam for 24h, and then it was placed in a drying oven at ...

Embodiment 2

[0037] Embodiment 2. prepare the hybrid adsorbent for removing heavy metal nickel ions in water with reactant volume ratio silane coupling agent: epichlorohydrin=4:1

[0038] Using the same experimental device, operating steps and the same ingredient ratio as in Example 1, the sol-gel reaction product prepared above was directly and slowly poured onto a clean, dry polytetrafluoroethylene plate to scrape the film, and at room temperature Place it for 24 hours, then put it in a constant temperature drying oven, convectively dry it at 90°C for 24 hours, and remove the membrane from the PTFE plate after cooling in the air to obtain a membrane-shaped membrane without a support. A hybrid adsorbent for the removal of heavy metal nickel ions in water.

[0039] The results of adsorption experiments show that: at 25°C and pH=4, its 2+ The adsorption capacity is 51.09 mg / g, which shows that the hybrid adsorbent can adsorb heavy metal nickel ions in water.

[0040] To sum up: this examp...

Embodiment 3

[0041] Embodiment 3. prepare the hybrid adsorbent for removing heavy metal nickel ions in water with reactant volume ratio silane coupling agent: epichlorohydrin=4:1

[0042] Using the same experimental device, operating steps and the same proportioning ratio as in Example 1, first dissolve the silane coupling agent with 20mL of N,N-dimethylformamide, and then slowly add 1mL of epichlorohydrin solution dropwise , keep stirring to make them carry out sol-gel reaction at 25°C for 6 hours, and continue to stir for 18 hours to obtain a sol-gel reaction product. The obtained sol-gel reaction product is left standing for defoaming, and then the standing The defoamed substance was dried for 48 hours at 200°C and 90% relative humidity in nitrogen to obtain a rod-shaped hybrid adsorbent that can be used to remove heavy metal nickel ions in water.

[0043] The results of the adsorption experiment show that at 25°C and pH=5, its 2+ The adsorption capacity is 49.67 mg / g, which shows that...

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Abstract

The invention discloses a preparation method of a hybrid absorbent used for removing heavy metal nickel ions in water. In an inert atmosphere or air, under a temperature of 0-100 DEG C, epichlorohydrin is added into a silane coupling agent according to a reactant volume ratio that silane coupling agent to epichlorohydrin is 10-0.01:1; a sol-gel reaction is carried out for 1-48h, such that a sol-gel reaction product is obtained; the sol-gel reaction product is allowed to stand and is defoamed; the product is dried for 1-48h in an inert atmosphere or air with a temperature of 0-200 DEG C and a relative humidity of 50-90%, such that the hybrid absorbent used for removing heavy metal nickel ions in water is obtained. The hybrid absorbent can present in structural morphology of particles, membranes or rods. The absorbent can or cannot contain a support substrate. The hybrid absorbent can be used for removing the heavy metal nickel ions in water with an absorption separation method, and has relatively high absorption capacity upon the heavy metal nickel ions in water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for preparing an inorganic-organic hybrid adsorbent for removing heavy metal nickel ions in water by using a sol-gel method. Background technique [0002] Chinese patent 2011102562141 proposes a method for preparing a flat membrane for sewage treatment, using the method of blending PVDF and attapulgite to prepare an organic-inorganic hybrid flat membrane, but the quality of PVDF and attapulgite prepared by this method When the ratio is 1:0.01, the adsorption rate of the hybrid membrane to nickel ions is close to 20%. The flat membrane prepared by this method has the disadvantages of low adsorption efficiency of the hybrid flat membrane and short service life of the flat membrane, so it cannot be applied to large-scale industrial water treatment. processing, so its application value is limited. [0003] Chinese patent 2011102541060 proposes a method for preparing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30C02F1/28C02F1/62
Inventor 刘俊生许敏胡科研李萌
Owner HEFEI UNIV
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