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

A technology of nickel ions and hybrid membranes, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve problems such as limited application value, difficult regeneration, complicated procedures, etc.

Pending Publication Date: 2020-10-27
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Chinese patent 201911353921.5 proposes a composite heavy metal adsorbent and its preparation method, which is obtained by mixing raw materials such as attapulgite, chitosan, and acrylic resin. However, the preparation method has many reaction steps and complicated procedures. The application value is limited, and there are no examples of it being used to adsorb and remove nickel ions in water
[0003] Chinese patent 201510188086.X proposes a method for preparing a hybrid adsorbent for removing heavy metal nickel ions in water. It uses silane coupling agent and epichlorohydrin for sol-gel reaction, and then obtains a hybrid adsorbent for removing heavy metals in water. A hybrid adsorbent of nickel ions; however, this method has the disadvantages of single silane coupling agent and long adsorption time (about 7 days), and its practical application value is limited.
[0004] Chinese patent 200610130671.5 proposes the preparation and application of a novel chitosan derivative adsorbent, which is obtained through NiSO 4 ·6H 2 The spherical adsorbent prepared by mixing O, chitosan, epichlorohydrin and other raw materials, but the preparation method has the disadvantages of many reaction steps, complicated procedures, difficult regeneration, etc., and its application value is limited.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of a hybrid membrane adsorbent for removing nickel ions in water, the steps are as follows:

[0034] (1) Preparation of 5% (mass ratio) PVA aqueous solution: add 25g of polyvinyl alcohol (PVA) with an average degree of polymerization of 1750±50 to a 250mL container equipped with a stirrer, then add an appropriate amount of deionized water, and at 90 Under the temperature condition of ℃, continue to stir until the PVA is completely dissolved, continue to stir for 3h to obtain a solution, after cooling, transfer the solution to a 500mL volumetric flask, add a certain amount of deionized water, shake evenly, and then add an appropriate amount of deionized water to When the solution reaches the full scale of the volumetric flask, it is shaken evenly, thereby preparing 500 mL of a PVA aqueous solution with a concentration of 5% by mass.

[0035] (2) Preparation of silicon-based hybrid precursor: at a temperature of 25 °C, first dissolve 0.75 g of chitosa...

Embodiment 2

[0039]Using the same experimental device and operating steps as in Example 1, changing the material ratio, and adding different masses of KH560 to CS, a series of hybrid membrane adsorbents without supports with different epoxy silane KH560 contents can be prepared. . Wherein, mass ratio of chitosan and epoxy silane KH560 is CS: KH560=3: 1 preparation product is marked as hybrid membrane adsorbent A; Similar to this, mass ratio is CS: KH560=3: 3 preparation product is marked as hybrid Chemicalized membrane adsorbent B; the mass ratio is CS: KH560=1: 3 The product prepared is marked as hybrid membrane adsorbent C.

[0040] Three kinds of hybrid membrane adsorbents A, B, and C prepared above were put into 100 mg / L nickel ions (Ni 2+ ) solution for adsorption to remove Ni in water 2+ Experiment, adsorption experiment process is as follows:

[0041] Weigh 0.2g of a series of hybrid membrane adsorbents without supports prepared above, place them in 150mL beakers respectively, an...

Embodiment 3

[0045] Select the hybrid membrane adsorbent A prepared in Example 2 to carry out a thermal analysis experiment to determine its thermal stability and temperature resistance; TGA and DrTGA thermal analysis curves are as follows figure 2 As shown, the DSC thermal analysis curve is as image 3 shown. Depend on figure 2 It can be seen that the thermal decomposition temperature of the hybrid membrane adsorbent A can reach about 260 °C, indicating that it has high thermal stability and good temperature resistance; when the temperature exceeds 292 °C, it will decompose and cause performance degradation. In contrast, pure chitosan begins to decompose at about 180°C. It can be seen that the hybridization (or doping) between chitosan and epoxysilane can overcome the defects of low decomposition temperature and poor temperature resistance of pure chitosan. Depend on image 3 It can be seen that the glass transition temperature T g It is about 172°C. When the temperature exceeds th...

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Abstract

The invention discloses a preparation method and application of a hybrid membrane adsorbent for removing nickel ions in water. The preparation method comprises the following steps: preparing a silicon-based hybrid precursor through a sol-gel reaction between chitosan and epoxy silane, adding the obtained silicon-based hybrid precursor into a polyvinyl alcohol aqueous solution for mixing, standingand defoaming the obtained substance to obtain a coating solution, and coating the coating solution on a support to obtain a membrane; or dissolving the film coating liquid with a solvent, and then coating the film to obtain the film; and drying the membrane to obtain the hybrid membrane adsorbent which can be used for removing the nickel ions in the water and can be provided with a support body or can be not provided with the support body. The prepared hybrid membrane adsorbent has relatively strong adsorption and removal capability on nickel ions in water, high adsorption efficiency and highspeed, and the nickel ion adsorption amount can be effectively adjusted, so that the prepared hybrid membrane adsorbent can be applied to adsorption recovery and purification treatment of the nickelions in nickel-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method and application for preparing a hybrid membrane adsorbent for removing nickel ions in water by utilizing a sol-gel reaction. Background technique [0002] Chinese patent 201911353921.5 proposes a composite heavy metal adsorbent and a preparation method thereof, which is prepared by mixing attapulgite, chitosan, acrylic resin and other raw materials, but the preparation method has disadvantages such as many reaction steps and complicated procedures. The application value is limited, and there is no example of its use for adsorption and removal of nickel ions in water. [0003] Chinese patent 201510188086.X proposes a preparation method of a hybrid adsorbent for removing heavy metal nickel ions in water, which is to perform a sol-gel reaction with a silane coupling agent and epichlorohydrin, and then obtain a method for removing heavy metals in water. It is a hybr...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/265B01J20/28033C02F1/285C02F2101/20
Inventor 刘俊生廖晓霞江南苏王平胡科研李萌
Owner HEFEI UNIV
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