Nanosilicon dioxide structure-based high-heavy metal ion adsorption chelating agent and preparation method thereof

A technology of heavy metal ions and chelating agents, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of weak heavy metal ions, small specific surface area of ​​copolymers, and few adsorption sites, etc. Fast and effective adsorption and chelation, the effect of broad application prospects

Active Publication Date: 2016-03-23
SHANDONG UNIV
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Problems solved by technology

However, the specific surface area of ​​the copolymer is small, the adsorption sites

Method used

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  • Nanosilicon dioxide structure-based high-heavy metal ion adsorption chelating agent and preparation method thereof
  • Nanosilicon dioxide structure-based high-heavy metal ion adsorption chelating agent and preparation method thereof
  • Nanosilicon dioxide structure-based high-heavy metal ion adsorption chelating agent and preparation method thereof

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[0007] The technical scheme of the present invention is as follows:

[0008] A high-adsorption nano-type heavy metal ion chelating agent having a structure shown in formula (I):

[0009]

[0010] In formula (I), 100≤n≤300.

[0011] According to the present invention, preferably, the specific surface area of ​​the heavy metal ion chelating agent is 130-170m 2 / g, the grafting rate is 55-94%.

[0012] The preparation method of the above-mentioned high adsorption nano-type heavy metal ion chelating agent includes the following steps:

[0013] (1) Nano SiO 2 Surface amino modification

[0014] Nano SiO 2 Disperse uniformly in absolute ethanol by ultrasonic, add 3-aminopropyltriethoxysilane coupling agent (KH550), stir at room temperature, heat up to 70-90℃, 2 Reflux in the atmosphere, centrifugation, and the solids obtained by centrifugation are dispersed and washed in absolute ethanol, and then dried in vacuum to obtain nano-SiO 2 -NH 2 ;

[0015] (2) Nano SiO 2 -NH 2 Brominated modification...

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Abstract

The invention relates to a nanosilicon dioxide structure-based high-heavy metal ion adsorption chelating agent and a preparation method thereof. According to the nanosilicon dioxide structure-based high-heavy metal ion adsorption chelating agent, nanosilicon dioxide nano-microsphere material is taken as a substrate, and polymers are grafted to the surface of a microsphere by the atom transfer radical polymerization (ATRP) technology; chemical modification is further performed on polymer brushes; dithiocarbamate (DTC) functional group with high adsorption chelating ability is introduced into a side chain of each polymer brush. The chelating agent has both the large specific surface area of the nanosilicon dioxide material and abundant absorption acting sites in the side chain structures of the polymers, and is capable of effectively adsorbing and separating multiple heavy metal ions in a shorter time, such as Cu<2+>, Cd<2+>, Ni<2+>, Pb<2+>, Hg<2+> and the like; the nanosilicon dioxide structure-based high-heavy metal ion adsorption chelating agent reported by the invention has huge application potential in the field of controlling the heavy metal ion pollution of water.

Description

technical field [0001] The invention relates to a high-adsorption heavy metal ion chelating agent based on a nano-silica structure and a preparation method thereof, belonging to the field of synthesis of functional polymer materials. Background technique [0002] Due to the increasingly frequent industrial activities such as mining and smelting of heavy metals, environmental pollution problems that endanger human survival and health have been caused, including heavy metal air pollution, heavy metal water pollution, and heavy metal soil pollution. Among them, water pollution has the characteristics of large area, difficult to control, and easy to spread, and causes serious harm to human body through food chain concentration or drinking water. When heavy metal ions enter the human body, they will bind to biological enzymes, thereby inhibiting protein synthesis, inducing protein denaturation, and interfering with the nervous system. The serious situation of heavy metal water p...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28
CPCB01J20/103B01J20/22B01J20/3071B01J20/3085C02F1/285
Inventor 谭业邦王鑫荆世尧
Owner SHANDONG UNIV
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