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Method and device for removing methyl mercury in sewage by using ternary composite nano material

A ternary composite, nanomaterial technology, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of complex sample pretreatment process, inability to quickly and accurately detect, and long test time, etc. To achieve the effect of simple removal process, enhanced catalytic degradation ability, and low removal cost

Active Publication Date: 2020-10-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method for the detection of methylmercury in water today is inductively coupled plasma mass spectrometry (ICP-MS). However, this method requires a complex sample pretreatment process and takes a long time to test, so it cannot quickly and accurately detect the content of methylmercury in water.

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  • Method and device for removing methyl mercury in sewage by using ternary composite nano material
  • Method and device for removing methyl mercury in sewage by using ternary composite nano material
  • Method and device for removing methyl mercury in sewage by using ternary composite nano material

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preparation example Construction

[0046] In some preferred embodiments, the preparation method of the ternary composite nanomaterial comprises: making a uniformly mixed reaction system containing a hydrotalcite-like compound precursor, a redox graphene, a metal salt, a reducing agent and a solvent at 120-180° C. The reaction is carried out for 18-22 hours to obtain the ternary composite nanomaterial.

[0047] Further, the precursor of the hydrotalcite-like compound includes any one or a combination of two or more of a combination of a nickel salt and an iron salt, a combination of a magnesium salt and an aluminum salt, a combination of a copper salt and an iron salt, etc., but not limited to this.

[0048] Further, the nickel salt includes nickel acetate, but is not limited thereto.

[0049] Further, the iron salt includes iron nitrate, but is not limited thereto.

[0050] Further, the magnesium salt includes magnesium nitrate, but is not limited thereto.

[0051] Further, the aluminum salt includes aluminu...

Embodiment 1

[0095] Synthesis of ternary composite nanomaterials:

[0096] 3ml redox graphene (2mg / ml), 5ml nickel acetate (0.2mol / L), 1ml ferric nitrate (0.2mol / L), 5ml chloroauric acid (0.02mol / L) and 7.5ml dimethylformamide Add it into a round bottom flask, stir magnetically at 25°C for 1h; add 80μl hydrazine hydrate (80%) dropwise, stir magnetically at 25°C for 0.5h; add 3.5ml ultrapure water, stir magnetically at 25°C for 0.5h. The mixed solution was added into the reaction kettle, placed in an oven and heated at 120°C for 16h, and then heated at 180°C for 2h. Cool to room temperature, add 30ml of ultrapure water and sonicate for 5 minutes, then centrifuge (10000rad / min), repeat the above steps, wash with water 3 times, wash with ethanol 3 times, and dry the product at 50°C for 12h to obtain a ternary compound with oxidase-like properties nanomaterials.

[0097] Treatment of methylmercury in sewage:

[0098] The inventive device such as figure 1 Shown is composed of sewage pool 1,...

Embodiment 2

[0109] Weigh 10mg of ternary composite nanomaterial with oxidase-like properties and 1ml of methylmercury aqueous solution (10 -4 mol / L) were mixed evenly, and allowed to stand at room temperature for 2 h. The mixed solution was centrifuged (10000rad / min), and the supernatant was taken for surface-enhanced Raman (SERS) detection.

[0110]Prepare a 3 mg / mL ternary composite nanomaterial solution with oxidase-like properties, take 30 μL of the aqueous solution and add it to 970 μL of acetic acid-sodium acetate buffer solution with a pH value of 4.2, and sonicate for 30 seconds to obtain a concentration of 0.09 mg / mL A ternary composite nanomaterial solution with oxidase-like properties; prepare a 15 mmol / L dimethyl sulfoxide solution of 3,3',5,5'-tetramethylbenzidine (TMB), and add 30 μL of the aqueous solution to In 970 μL of acetic acid-sodium acetate buffer solution with a pH value of 4.2, sonicate for 30 s to obtain a TMB chromogenic solution with a concentration of 0.45 mm...

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Abstract

The invention discloses a method and a device for removing methyl mercury in sewage by using a ternary composite nano material. The method comprises the following steps: uniformly mixing the ternary composite nano material with the sewage possibly containing the methyl mercury, thereby catalytically degrading the methyl mercury in the sewage into carbon dioxide, water and amalgam formed on the ternary composite nano material. The device comprises a sewage storage mechanism, a ternary composite nano material storage mechanism, a degradation generation mechanism, a ternary composite nano material recovery mechanism and a degradation monitoring mechanism. According to the method, the methyl mercury can be removed only by utilizing the oxidase property of the ternary composite nano material without light and no microorganisms; compared with methods for removing the methyl mercury through biodegradation, photocatalytic degradation and the like, the method has the advantages of being simpleand convenient in removal process, high in removal efficiency, high in removal speed, low in removal cost and the like, meanwhile, mercury ions entering the water body again are not generated, secondary pollution is avoided, and the methyl mercury in the sewage can be completely removed.

Description

technical field [0001] The invention particularly relates to a method and a device for removing methylmercury in sewage by using ternary composite nanomaterials, belonging to the technical field of sewage treatment. Background technique [0002] Among heavy metal pollution, mercury pollution is considered to be one of the most harmful to human health, while methylmercury has high neurotoxicity and can permeate biofilms, and has been proved to be the most toxic substance in the form of mercury. At the same time, methylmercury can be enriched through the food chain in natural water bodies, causing great health risks to fish-eating organisms and humans. Methylmercury mainly invades the human central nervous system, causing cerebellar ataxia, narrowed vision, and difficulty in pronunciation. At the same time, methylmercury can also invade fetal brain tissue along with the blood, causing extensive and serious damage to brain cells, forming fetal Minamata disease. Internationally...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J23/38B01J23/89C02F101/30
CPCC02F1/725B01J23/38B01J23/892C02F2101/30C02F2303/14
Inventor 宋薇刘皓郭月赵冰
Owner JILIN UNIV
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