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Heavy metal ion adsorbent and preparation method thereof

A technology of heavy metal ions and adsorbents, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of the ability to remove metal ions, affect the chelation of metal ions, etc., and achieve reuse rate High, easy to remove, good adsorption effect

Inactive Publication Date: 2015-04-22
BEIJING NORMAL UNIVERSITY +1
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  • Description
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Problems solved by technology

The disadvantage of this method is that because the polymerized DNA is hydrophobic, the metal ions in the water cannot fully interact with the DNA molecules; moreover, the configuration of the polymerized DNA molecules after irradiation has changed, which affects its interaction with metal ions. Chelation between
Therefore, the ability of such microspheres to remove metal ions is affected

Method used

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  • Heavy metal ion adsorbent and preparation method thereof
  • Heavy metal ion adsorbent and preparation method thereof
  • Heavy metal ion adsorbent and preparation method thereof

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preparation example Construction

[0045] The invention also discloses a preparation method of a heavy metal ion adsorbent, comprising the following steps:

[0046] Ultrasonic dispersing the core of polyamide-amine dendrimers grafted by silane compounds in a buffer solution containing polyanions, and then standing still to obtain a heavy metal ion adsorbent;

[0047] The core is ferric oxide coated with silicon dioxide.

[0048] The time for the ultrasonic dispersion is preferably 5 to 20 minutes, and the standing time is preferably 5 to 30 minutes,

[0049] According to the present invention, preferably, before the nucleus ultrasonic dispersion of grafted polyamide-amine dendrimers, it also includes: grafting the core and spatial structure of polyamide-amine dendrimers by silane compounds into: Spherical polyamidoamine dendrimers react in organic solvents in the dark. Through the light-shielding reaction, the polyamide-amine dendrimers with a spherical spatial structure are grafted on the polyamide-amine den...

Embodiment 1

[0066] At 25°C, 5.4g FeSO 4 ·7H 2 O and 6.8 g FeCl 3 (Molar ratio: Fe(III) / Fe(II)=2:1) ​​was dissolved in 130 mL of high-purity argon-deoxygenated water, stirred and concentrated ammonia water (about 60 mL) was added dropwise until the pH was 10.0. Then, heat at 65° C. for 50 minutes, contact the outer wall of the container with a magnet to collect the magnetic nanomaterials, and wash the magnetic nanomaterials with deionized water for 3 times to neutralize the obtained black powder. Under nitrogen protection, 2 g of the synthesized magnetic Fe 3 o 4 Nanomaterials were dispersed in absolute ethanol, and 60 mL of ammonia water and 4 mL of tetraethyl orthosilicate (TEOS, Si(OC 2 h 5 ) 4 ). After continuing to sonicate in an ice-water bath for 2 h, the product was collected by contacting the container wall with a magnet, washed 3 times with absolute ethanol, and dried under vacuum (70 ° C, about 12 h) to obtain magnetic nanoparticles (Fe 3 o 4 SiO 2 ).

Embodiment 2

[0068] 0.5g Fe 3 o 4 SiO 2 Particles, 30mL toluene and 5mL 3-aminopropyltriethoxysilane were added into a 50mL flask, and the mixture was sonicated for 30min, then reacted at 110°C for 8h. After the reaction, the product was separated from the liquid with a magnet, washed five times with absolute ethanol (5 mL each time), and the obtained product was vacuum-dried at 50° C. for 24 h. Described product is 0 generation polyamido-amine graft (Fe 3 o 4 SiO 2 PADD G0).

[0069] 0.3g Fe 3 o 4 SiO 2 Add PADD G0 and 10mL methanol into the round bottom flask, sonicate for 30min to make the Fe 3 o 4 SiO 2 PADD G0 was dispersed, then 0.1mL methyl acrylate was slowly added into the flask, and reacted at 50°C for 48h. After the reaction, use a magnet to separate the product from the liquid, wash it with anhydrous methanol 5 times (2 mL each time), and dry the product in vacuum at 50 °C for 24 hours. The product is Fe 3 o 4 SiO 2 PADD G0.5.

[0070] 0.3g Fe 3 o 4 SiO 2 Add...

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Abstract

The invention provides a heavy metal ion adsorbent which contains nucleuses, polyamidoamine dendrimers grafted to the nucleuses through a silane compound and polyanions absorbed to the polyamidoamine dendrimers. The nucleuses are silicon dioxide coated ferroferric oxide. In the heavy metal ion adsorbent, the polyamidoamine dendrimers are absorbed with a layer of polyanions through electrostatic attraction, polyanions and especially the configuration of DNA is not changed, it is ensured that the outermost-layer polyanions can produce strong chelation with heavy metal ions during absorption, and accordingly the heavy metal ions in a water body are effectively removed. The heavy metal ion adsorbent is small in particle size and large in specific surface area. Furthermore, the polyamidoamine dendrimers with spherical structures can be further grafted to the polyamidoamine dendrimers and then the polyanions are absorbed to the polyamidoamine dendrimers, so that the heavy metal ion adsorbent is good in absorption effect and high in repeating utilization rate. In addition, the nucleuses in the heavy metal ion adsorbent are magnetic, so that separation is facilitated.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a heavy metal ion adsorbent and a preparation method thereof. Background technique [0002] Heavy metals refer to atoms with an atomic weight between 63.5 and 200.6, and their specific gravity is generally greater than 5.0g / cm 3 . Heavy metals are non-degradable in the environment and often accumulate in organisms, so the management of heavy metals has attracted much attention. Many heavy metal ions have been proven to be toxic or carcinogenic. For example, excessive intake of copper will bring serious poisoning problems, such as vomiting, convulsions, convulsions, and even death; the typical example of mercury poisoning is Minamata disease; lead can cause central nervous system, kidney, liver and reproductive system damage. [0003] The removal methods of heavy metals in water include chemical precipitation, ion exchange, membrane filtration, coagulation-flocculation, electroc...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/264B01J20/28009B01J2220/4812C02F1/285C02F2101/20
Inventor 秦卫东葛莹梁晓
Owner BEIJING NORMAL UNIVERSITY
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