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Carboxylic acid ligand modified hydrothermal carbon material and method for removing heavy metal ions in wastewater

A technology of heavy metal ions and hydrothermal carbon, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem of low efficiency of heavy metal ions, achieve improved removal efficiency, low price, and simple operation Effect

Active Publication Date: 2019-08-13
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low efficiency of removing heavy metal ions by hydrothermal charcoal, and realize the efficient removal of heavy metal ions in water

Method used

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  • Carboxylic acid ligand modified hydrothermal carbon material and method for removing heavy metal ions in wastewater
  • Carboxylic acid ligand modified hydrothermal carbon material and method for removing heavy metal ions in wastewater
  • Carboxylic acid ligand modified hydrothermal carbon material and method for removing heavy metal ions in wastewater

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preparation example Construction

[0053] In the embodiment of the present invention, the preparation method of the hydrothermal charcoal powder that adopts comprises:

[0054] Wash, dry, and pulverize the biomass material, pass through a 200-mesh sieve, and retain the biomass material with a particle size of ≤200 mesh, then put the biomass material and water in the liner of a polytetrafluoroethylene reactor, and stir it magnetically for 2 hours. Then the mixture was transferred to an autoclave and reacted at 200 °C for 6 h. After the reaction, the solid was washed with water and ethanol to remove ash, and dried at 60° C. to obtain hydrothermal carbon powder.

[0055] Among them, in Examples 1-8, the biomass materials for preparing hydrothermal charcoal powder are respectively straw (Example 1), fallen leaves (Example 2), walnut shells (Example 3), rice husks (Example 4), Barley hulls (Example 5), rice bran (Example 6), corncobs (Example 7), straw (Example 8).

[0056] In the examples of the present invention...

Embodiment 1

[0060] This example verifies the effect of hydrothermal carbon modified with malonic acid (PA) on removing divalent nickel.

[0061] Preparation of malonate-modified hydrothermal charcoal:

[0062] Weigh malonic acid and hydrothermal charcoal powder according to the mass ratio of malonic acid and hydrothermal charcoal as 1:200, add them into an agate jar with a volume of 100mL, and then use a planetary ball mill to perform ball milling with a rotation speed of 400rpm and a ball milling time of 2h. The solid powder after ball milling was washed with distilled water and ethanol respectively, and then the sample was dried at 60°C to obtain malonate-modified hydrothermal carbon.

[0063] For the remediation of wastewater containing heavy metal divalent nickel, the divalent nickel aqueous solution with a concentration of 20mg / L was used as the simulated wastewater. Take 50mL of simulated wastewater, and add 50mg of malonic acid-modified hydrothermal carbon material into it. Shak...

Embodiment 2

[0065] This example verifies the effect of hydrothermal charcoal modified with malonic acid (PA) on removing divalent copper.

[0066] The preparation method of the hydrothermal charcoal modified by malonic acid is the same as that in Example 1.

[0067] For the remediation of wastewater containing heavy metal divalent copper, the divalent copper aqueous solution with a concentration of 20mg / L was used as the simulated wastewater. Take 50mL of simulated wastewater, and add 50mg of malonic acid-modified hydrothermal carbon material into it. Shake the reaction solution on a shaker to make the hydrothermal charcoal fully contact with the solution. Such as figure 2 As shown, after reacting for 160 minutes, the removal rate of divalent copper in water can reach 100%.

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Abstract

The invention discloses a carboxylic acid ligand modified hydrothermal carbon material and a method for removing heavy metal ions in water. The carboxylic acid ligand modified hydrothermal carbon material is prepared by a method comprising the following steps: mixing and ball-milling a carboxylic acid ligand and hydrothermal carbon powder, washing and drying the mixture to obtain the carboxylic acid ligand modified hydrothermal carbon material. The carboxylic acid ligand modified hydrothermal carbon material has the advantages that the common ligand is modified on the surface of hydrothermal carbon through a ball-milling method, the operation is simple, and the capacity of removing heavy metal ions can be remarkably improved; the hydrothermal carbon has the characteristics of low price andenvironmental friendliness and can be widely used for actual treatment of heavy metal pollution. The method has the general capability of removing different heavy metal ions.

Description

technical field [0001] The invention belongs to the field of water pollution control, and more specifically relates to a hydrothermal carbon material modified by carboxylic acid ligands and a method for removing heavy metal ions in wastewater, that is, a method for modifying the surface of hydrothermal carbon with carboxylic acid to enhance It is a method for removing heavy metal ions in water. This method is suitable for the treatment of heavy metal pollution in the fields of industry, agriculture and mining. Background technique [0002] With the rapid development of the economy, the problem of water pollution has gradually attracted widespread attention from all walks of life. Among many water environment pollutants, heavy metal ions are usually highly carcinogenic. Unlike organic pollutants, heavy metal ions cannot be mineralized by biological or chemical methods, but gradually accumulate in organisms. Therefore, environmental workers are developing green and environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/22B01J20/20C02F1/283C02F2101/20
Inventor 申文娟张娟娟李建芬朱筱曦肖梦涵秦振华贺维韬
Owner WUHAN POLYTECHNIC UNIVERSITY
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