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Method for oxidative degradation of heavy metal complex and recovery of heavy metal through MXene reinforced Fenton

A technology of Fenton oxidation and heavy metals, which is applied in chemical instruments and methods, water treatment of special compounds, oxidized water/sewage treatment, etc., can solve the problems of large consumption of acid and alkali reagents, inability to realize simultaneous removal and recovery of high value-added heavy metals, etc. , to achieve the effect of simplifying the process flow, enhancing removal and promoting activation

Active Publication Date: 2021-07-09
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods are still unable to realize the simultaneous removal and recovery of high value-added heavy metals, and need to consume a large amount of acid-base reagents

Method used

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  • Method for oxidative degradation of heavy metal complex and recovery of heavy metal through MXene reinforced Fenton
  • Method for oxidative degradation of heavy metal complex and recovery of heavy metal through MXene reinforced Fenton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for MXene-enhanced Fenton-like oxidation degradation of heavy metal complexes and recovery of heavy metals, the specific steps are as follows:

[0029] (1) Choose Ti 3 C 2 For MXene, the target pollutant is ethylenediaminetetraacetic acid copper complex (EDTA-Cu), and the oxidant is potassium monopersulfate (PMS). Add 50μM EDTA-Cu solution, 60mg / LTi 3 C 2 and 1 mM potassium persulfate. A magnetic stirrer was used to stir rapidly at a stirring speed of 500 rpm. After 20 minutes of reaction, an inductively coupled plasma mass spectrometer (ICP-MS) was used to measure the Cu element concentration in the reaction solution, and the removal rate of Cu ions was 85%.

[0030] (2) Leave the solution after the reaction in step (1) to stand or filter to separate the solid from the liquid, use pickling solution to clean the precipitate or filter residue, and recover heavy metals.

[0031] (3) The washed MXene was freeze-dried at -10°C for 24 h and reused.

Embodiment 2

[0033] A method for MXene-enhanced Fenton-like oxidation degradation of heavy metal complexes and recovery of heavy metals, the specific steps are as follows:

[0034] (1) Choose Ti 3 C 2 MXene, copper citrate complex was selected as the target pollutant, and sodium persulfate was selected as the oxidant. Add 50μM copper citrate complex solution, 100mg / L Ti 3 C 2 and 2mM sodium persulfate. A magnetic stirrer was used to stir rapidly at a stirring speed of 700 rpm. After reacting for 90 minutes, an inductively coupled plasma mass spectrometer (ICP-MS) was used to measure the Cu element concentration in the reaction solution, and the removal rate of Cu ions was 97%.

[0035] (2) Leave the solution after the reaction in step (1) to stand or filter to separate the solid from the liquid, use pickling solution to clean the precipitate or filter residue, and recover heavy metals.

[0036] (3) The washed MXene was freeze-dried at a temperature below -20 °C for 23 h and then reus...

Embodiment 3

[0038] A method for MXene-enhanced Fenton-like oxidation degradation of heavy metal complexes and recovery of heavy metals, the specific steps are as follows:

[0039] (1) Choose Nb 2 C MXene, the target pollutant is ethylenediaminetetraacetic acid iron complex (EDTA-Fe), and the oxidant is hydrogen peroxide. Add 50μM EDTA-Fe solution, 10mg / LNb 2 C and 20 mM hydrogen peroxide. A magnetic stirrer was used to stir rapidly at a stirring speed of 500 rpm. After 30 minutes of reaction, an inductively coupled plasma mass spectrometer (ICP-MS) was used to measure the concentration of Fe in the reaction solution, and the removal rate of Fe ions was 92%.

[0040] (2) Leave the solution after the reaction in step (1) to stand or filter to separate the solid from the liquid, use pickling solution to clean the precipitate or filter residue, and recover heavy metals.

[0041] (3) The washed MXene was freeze-dried at a temperature below -30 °C for 24 h and then reused.

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Abstract

The invention relates to a method for oxidative degradation of a heavy metal complex and recovery of heavy metal through MXene reinforced Fenton, and belongs to the field of environmental protection. The method comprises the steps of adding MXene with the concentration of 0.1-100 mg / L and persulfate or hydrogen peroxide with the concentration of 0.1-100 mM into the wastewater containing the heavy metal complex, and stirring to react for 10-90 minutes. The method is wide in pH application range, low-valence transition metal ions do not need to be additionally added, the pH value does not need to be repeatedly adjusted, and efficient degradation of the heavy metal complex and synchronous recovery of the heavy metal can be achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for MXene-enhanced Fenton-like oxidation degradation of heavy metal complexes and recovery of heavy metals. Background technique [0002] Heavy metal complexes have strong stability in a wide pH range, and traditional free heavy metal ion treatment methods such as adsorption, alkali precipitation and ion exchange are difficult to effectively remove them. It is of great significance to develop new and efficient heavy metal complex treatment technologies. [0003] In recent years, advanced oxidation technology has been extensively studied in the field of removing heavy metal complexes. The strong oxidizing active species produced by electrocatalysis, photocatalysis, heterogeneous catalyst catalysis, etc. can oxidize and break the heavy metal complex, release the free heavy metal, and then use alkali precipitation and other treatment methods to precipitate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/70C02F101/20
CPCC02F1/722C02F1/70C02F2101/20C02F2305/026Y02P10/20
Inventor 李长平宋浩然祖道远李琢王玉伟
Owner DONGGUAN UNIV OF TECH
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