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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 po

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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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Example Embodiment

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

[0046] The nucleus of the polyamide-amine dendrimer grafted by the silane compound is ultrasonically dispersed in the buffer solution containing the polyanion, and then left to stand to obtain the heavy metal ion adsorbent;

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

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

[0049] According to the present invention, preferably, before the core of the polyamide-amine dendrimer is grafted with ultrasonic dispersion, the method further includes: grafting the core and space structure of the polyamide-amine dendrimer with the silane compound to Spherical polyamide-amine dendrimers react in organic solvents to avoid light. Through the light-shielding reaction, the spherical polyamide-amine dendrimer is grafted onto the polyamid...

Example Embodiment

[0065] Example 1

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

Example Embodiment

[0067] Example 2

[0068] Add 0.5g Fe 3 O 4 SiO 2 The particles, 30 mL of toluene and 5 mL of 3-aminopropyltriethoxysilane were added to a 50 mL flask, and the mixture was sonicated for 30 minutes and reacted at 110° C. for 8 hours. After the reaction, the product and the liquid were separated with a magnet, and washed with absolute ethanol 5 times (5 mL each time), and the resulting product was vacuum dried at 50° C. for 24 h. The product is 0 generation polyamide-amine graft (Fe 3 O 4 SiO 2 PADD G0).

[0069] 0.3g Fe 3 O 4 SiO 2 PADD G0 and 10mL methanol were added to the round-bottomed flask, sonicated for 30min to make Fe 3 O 4 SiO 2 PADD G0 was dispersed, and then 0.1 mL of methyl acrylate was slowly added to the flask, and reacted at 50°C for 48 hours. After the reaction, the product is separated from the liquid with a magnet, and washed with anhydrous methanol 5 times (2mL each time), the resulting product is vacuum dried at 50°C for 24h, and the product is Fe 3 O 4 SiO 2 P...

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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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Owner BEIJING NORMAL UNIVERSITY
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