Method for removing organic matters on surface of micro-plastic by optimizing Fenton reagent reaction conditions

A Fenton's reagent and microplastic technology, applied in the field of environmental pollution control, can solve the problems of high price, long digestion time, damage, etc., and achieve the effect of economy, convenience and rapid response

Inactive Publication Date: 2020-02-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of soil and sediment is complex, microplastics exist in soil and sediment environment for a long time, and usually adsorb some organic matter on their surface, which interferes with the characterization and identification of microplastics
In order to remove organic matter, acid, alkali or enzyme digestion methods are usually used, but acid digestion will destroy plastic materials such as polyamide (PA); alkali digestion, such as NaOH, will lead to the degradation of PC and PET; enzymatic digestion, such as proteinase-K due to It is expensive and can only be used in small sample sizes
In addition, 30% H 2 o 2 Organic matter is digested, but the digestion time is too long (usually seven days or more)

Method used

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  • Method for removing organic matters on surface of micro-plastic by optimizing Fenton reagent reaction conditions
  • Method for removing organic matters on surface of micro-plastic by optimizing Fenton reagent reaction conditions
  • Method for removing organic matters on surface of micro-plastic by optimizing Fenton reagent reaction conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step is to prepare Fenton's reagent

[0025] Formulated FeSO 4 ·7H 2 O in water, and an equal volume of 30% H 2 o 2 , to obtain Fenton's reagent; the concentration of the Fenton's reagent is 7.5g / L.

[0026] The second step is to prepare microplastic particles of different sizes

[0027] For microplastics with large size (size ≥0.5mm), such as PA(2.0-2.8mm), PC(2.0-2.8mm), PE(2.0-2.8mm), PP(0.9-1.0mm), PP(0.5- 0.6mm), PET (0.9-1.0mm), PS (0.5-0.6mm) and PET (0.5-0.6mm) are obtained through purchased plastic products; for small-sized microplastics (size ≤ 0.2mm) including PET (0.1 -0.2mm) and PVC (0.1-0.2mm) are obtained by crushing plastics of corresponding large particle size in a pulverizer and sifting through sieves of different meshes.

[0028] The third step is to measure the size of microplastic particles before digestion

[0029] The microplastic particles include large-sized microplastic particles and small-sized microplastic particles.

[0030...

Embodiment 2

[0039] The first step is to prepare Fenton's reagent

[0040] Formulated FeSO 4 ·7H 2 O in water, and an equal volume of 30% H 2 o 2 , to obtain Fenton's reagent; the concentration of the Fenton's reagent is 5g / L.

[0041] The second step is to prepare microplastic particles of different sizes

[0042] For microplastics with large size (size ≥0.5mm), such as PA(2.0-2.8mm), PC(2.0-2.8mm), PE(2.0-2.8mm), PP(0.9-1.0mm), PP(0.5- 0.6mm), PET (0.9-1.0mm), PS (0.5-0.6mm) and PET (0.5-0.6mm) are obtained through purchased plastic products; for small-sized microplastics (size ≤ 0.2mm) including PET (0.1 -0.2mm) and PVC (0.1-0.2mm) are obtained by crushing plastics of corresponding large particle size in a pulverizer and sifting through sieves of different meshes.

[0043] The third step is to measure the size of microplastic particles before digestion

[0044] The microplastic particles include large-sized microplastic particles and small-sized microplastic particles.

[0045] ...

Embodiment 3

[0054] The first step is to prepare Fenton's reagent

[0055] Formulated FeSO 4 ·7H 2 O in water, and an equal volume of 30% H 2 o 2 , to obtain Fenton's reagent; the concentration of the Fenton's reagent is 10g / L.

[0056] The second step is to prepare microplastic particles of different sizes

[0057] For microplastics with large size (size ≥0.5mm), such as PA(2.0-2.8mm), PC(2.0-2.8mm), PE(2.0-2.8mm), PP(0.9-1.0mm), PP(0.5- 0.6mm), PET (0.9-1.0mm), PS (0.5-0.6mm) and PET (0.5-0.6mm) are obtained through purchased plastic products; for small-sized microplastics (size ≤ 0.2mm) including PET (0.1 -0.2mm) and PVC (0.1-0.2mm) are obtained by crushing plastics of corresponding large particle size in a pulverizer and sifting through sieves of different meshes.

[0058] The third step is to measure the size of microplastic particles before digestion

[0059] The microplastic particles include large-sized microplastic particles and small-sized microplastic particles.

[0060]...

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Abstract

A method for removing organic matters on a surface of micro-plastic by optimizing Fenton reagent reaction conditions, and belongs to the field of environmental pollution control. The method comprisesthe steps of: preparing a Fenton reagent with a concentration of 5-10 g/L; preparing different sizes of microplastic particles, and measuring the sizes of microplastic particles before digestion; andfinally, performing the digestion by using the Fenton reagent. The method provided by the invention can remove organic matters on the surface of the micro-plastic, does not have obvious influence on the micro-plastic, and has the higher removal efficiency on the organic matters on the surface of the micro-plastic in an actual sample.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, and in particular relates to a method for removing organic matter on the surface of microplastics by optimizing the reaction conditions of Fenton's reagent. Background technique [0002] As a new type of pollutant, microplastics have attracted more and more attention from researchers. Generally, microplastics are defined as plastic materials such as plastic particles, fragments, fibers and films with a diameter of less than 5mm. There are generally two sources of microplastics: primary source and secondary source. The primary source refers to the production of plastic particles, microbeads and artificial fine fibers added to personal care products, etc.; Small particle size plastics decomposed under environmental conditions such as heat, ultraviolet rays and mechanical abrasion. At present, microplastics have been detected in water media such as seawater, fresh water, sewage, tap ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/34G01N1/44
CPCG01N1/34G01N1/44
Inventor 佟慧妍江谦益李政坤胡行帅钟晓聪
Owner DALIAN UNIV OF TECH
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