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Polymerized Schiff base type adsorption material and preparation thereof, and application in heavy metal adsorption

An adsorption material, Schiff base type technology, applied in adsorption water/sewage treatment, other chemical processes, water/sludge/sewage treatment, etc. It can solve the problems of unsatisfactory adsorption performance and poor stability, and achieve excellent adsorption effect. , The product properties are stable and easy to use.

Active Publication Date: 2020-09-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems of poor stability and unsatisfactory adsorption performance of the existing polymer adsorbent in the heavy metal adsorption method under strong acidic conditions, the first purpose of the present invention is to provide a polymeric Schiff base type adsorption material, which aims to improve the material in the Stability under strongly acidic conditions, improved metal adsorption performance

Method used

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  • Polymerized Schiff base type adsorption material and preparation thereof, and application in heavy metal adsorption
  • Polymerized Schiff base type adsorption material and preparation thereof, and application in heavy metal adsorption
  • Polymerized Schiff base type adsorption material and preparation thereof, and application in heavy metal adsorption

Examples

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Effect test

Embodiment 1

[0083] Take 1.057 mL of glutaraldehyde solution (50%) and add it into 15 mL of deionized water to prepare a glutaraldehyde solution, which contains 0.005 mol of glutaraldehyde. Dissolve 0.2704g of m-phenylenediamine (2.5mM) in 5mL of deionized water, and add the m-phenylenediamine solution into the prepared glutaraldehyde solution. 2 Stir mechanically under protective gas for 1 h. The suspension formed after the reaction was vacuum filtered, and the solid product obtained was washed three times with deionized water and absolute ethanol, and finally dried in vacuum at 50° C. for 12 h to obtain a sample and weigh it. The sample mass was 0.7096 g ( The yield is 92.1%). The TEM image of the sample is shown in figure 1 ; The particle size is 1 μm.

Embodiment 2

[0085] Take 528 μL of glutaraldehyde solution (50%) and add it into 15 mL of deionized water to prepare a glutaraldehyde solution, which contains 0.0025 mol of glutaraldehyde. Dissolve 0.2704g of m-phenylenediamine (2.5mM) in 5mL of deionized water, and add the m-phenylenediamine solution into the prepared glutaraldehyde solution. 2Stir mechanically under protective gas for 1 h. Add the suspension formed after the reaction into a closed polytetrafluoroethylene reactor, and react at 120° C. for 12 hours. The hydroheated product was vacuum filtered with a G5 sand core funnel, and the obtained solid product was washed three times with 70°C deionized water and absolute ethanol, and finally vacuum-dried at 50°C for 12 hours to obtain a sample and weigh it , sample quality 0.3377g (yield is 64.9%). The TEM image of the sample is shown in figure 2 a; particle size is 200nm; shell thickness is 20nm.

Embodiment 3

[0087] Take 1.057 mL of glutaraldehyde solution (50%) and add it into 15 mL of deionized water to prepare a glutaraldehyde solution, which contains 0.005 mol of glutaraldehyde. Dissolve 0.2704 g of m-phenylenediamine in 5 mL of deionized water, add the m-phenylenediamine solution into the prepared glutaraldehyde solution, and mechanically stir for 1 h under N2 as a protective gas. Add the suspension formed after the reaction into a closed polytetrafluoroethylene reactor and react at 120° C. for 12 hours. The hydroheated product was vacuum filtered with a G5 sand core funnel, and the obtained solid product was washed three times with 70°C deionized water and absolute ethanol, and finally vacuum-dried at 50°C for 12 hours to obtain a sample and weigh it , sample quality 0.650g (yield is 84.5%). The TEM image of the sample is shown in figure 2 b; particle size is 200nm; shell thickness is 50nm.

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Abstract

The invention belongs to the field of heavy metal adsorption, and particularly discloses a polymerized Schiff base type adsorbing material, which has a core-shell structure, wherein the core is a polymerized Schiff base polymer, and the shell is a product of a hydrothermal reaction of the polymerized Schiff base polymer. The invention also provides a preparation method of the polymerized Schiff base type adsorbing material and application of the polymerized Schiff base type adsorbing material in heavy metal adsorption, especially in adsorption of heavy metal oxyacid. According to the method, the core-shell thickness can be regulated and controlled by adjusting different hydrothermal temperatures, the synthesis process is simple and easy to operate, an initiator and a catalyst are not needed, and the environment is not polluted. The maximum adsorption capacities of the obtained nano-polymerization Schiff base type adsorption material on heavy metals, particularly Cr (VI) and Re (VII), can reach 769 mg / g and 142 mg / g respectively.

Description

technical field [0001] The invention relates to the field of heavy metal pollution treatment, and specifically relates to an adsorption material for heavy metal pollution. Background technique [0002] Chromium-containing wastewater is commonly found in electroplating, tanning, printing and dyeing industries, and the annual discharge of chromium reaches hundreds of tons. Chromium-containing wastewater is usually acidic, and the most toxic of different valence states of chromium is Cr(VI), mainly Cr 2 o 7 2 - and CrO 4 - Existing in form, it has very strong teratogenicity, carcinogenicity, and bioaccumulation, causing great harm to the environment and human health. Therefore, the efficient removal of Cr(VI) in wastewater has become the top priority in the treatment of heavy metal pollution. [0003] Re is a rare and precious metal, which plays an extremely important role in the petrochemical and aerospace fields. However, rhenium is very rare and dispersed in minerals, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28B01J20/30C02F101/20C02F101/22
CPCB01J20/262C02F1/285C02F2101/20C02F2101/22
Inventor 杨志辉任力理王海鹰柴立元杨卫春唐崇俭王升刘恢颜旭
Owner CENT SOUTH UNIV
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