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Method of removing chromium (VI) and dye pollutants by using plant polyphenol substances for in-situ synthesizing iron-based material

A technology of plant polyphenols and iron-based materials, which is applied in the field of environmental pollution control and restoration, can solve the problems of failure to completely eliminate organic pollutants, poor dye treatment effect, and low wastewater adaptability, and achieve easy follow-up recycling process operations, Significant removal effect and reduction of recycling cost

Inactive Publication Date: 2017-07-04
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used physical treatment techniques include adsorption, flocculation and membrane separation, etc., but these methods only transfer organic matter such as dyes from the liquid phase (wastewater) to the solid phase (such as activated carbon), and have not achieved the purpose of completely eliminating organic pollutants, and will bring a lot of sludge
Although the biological method has simple treatment equipment, it has disadvantages such as long operation period, low adaptability to wastewater, and poor treatment effect on some dyes.

Method used

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  • Method of removing chromium (VI) and dye pollutants by using plant polyphenol substances for in-situ synthesizing iron-based material
  • Method of removing chromium (VI) and dye pollutants by using plant polyphenol substances for in-situ synthesizing iron-based material
  • Method of removing chromium (VI) and dye pollutants by using plant polyphenol substances for in-situ synthesizing iron-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Example 1 Degradation of Cr(VI)-containing wastewater by in-situ synthesis of iron-based materials using green tea

[0067] 1. Using green tea to synthesize iron-based materials in situ to degrade Cr(VI)-containing wastewater includes the following steps:

[0068] Put 10 g of green tea in a blender and crush for 2 min, weigh 4 g of green tea powder in 200 mL of deionized water, boil at 80°C for 15 min, and filter out the tea dregs with filter paper after cooling to obtain the green tea extract;

[0069] Weigh 5g FeCl 3 •6H 2 O was dissolved in 500 mL deionized water to obtain an iron salt solution;

[0070] The Cr(VI)-containing wastewater used in this example is artificially prepared, that is, analytically pure potassium dichromate is dissolved in deionized water, and the Cr(VI) concentration is 50 mg / L.

[0071] Pipette 60 mL of the above wastewater into a 100 mL Erlenmeyer flask, add 2 mL of Fe(III) solution, shake it manually at 25°C, and let it stand for 5 min; ...

Embodiment 2

[0073] Example 2 Degradation of Cr(VI) in electroplating wastewater by in-situ synthesis of iron-based materials using green tea

[0074] 1. Using green tea to synthesize iron-based materials in situ to degrade Cr(VI) in electroplating wastewater, including the following steps:

[0075] Put 10 g of green tea in a blender and crush for 1 min, weigh 4 g of green tea powder in 200 mL of deionized water, boil at 80°C for 30 min, and filter out the tea dregs with filter paper after cooling to obtain the green tea extract;

[0076] Weigh 2g FeSO 4 •7H 2 O was dissolved in 150 mL deionized water to obtain an iron salt solution;

[0077] The electroplating wastewater used in this example comes from an electroplating company in Panyu District, Guangzhou, and the concentration of Cr(VI) is 56.8 mg / L.

[0078] Take 100 mL of the above wastewater into a 250 mL Erlenmeyer flask, add 3 mL of iron salt solution, shake it manually at 40 °C, and let it stand for 10 min; pipette 8 mL of gree...

Embodiment 3

[0080] Example 3 Using green tea to synthesize iron-based materials in situ to degrade acid black 1 in water

[0081] 1. Using green tea to synthesize iron-based materials in situ to degrade acid black 1 in water, including the following steps:

[0082] Put 10g of green tea in a blender and crush for 1 min, weigh 4 g of green tea powder in 200 mL of deionized water, boil at 80°C for 1 h, filter out the tea dregs with filter paper after cooling, and collect the filtrate (green tea extract) in an anaerobic bottle In the middle, blow nitrogen for 30 min, and then seal it for later use.

[0083] Weigh 8g Fe 2 (SO 4 ) 3 Dissolve in 200mL deoxygenated water to obtain iron salt solution.

[0084] The dye used in this example is Acid Black 1, and the waste water is artificially prepared by dissolving analytically pure Acid Black 1 in deoxygenated water, wherein the concentration of Acid Black 1 is 50 mg / L.

[0085] Add 50 mL of Acid Black 1 wastewater into a 100 mL anaerobic bott...

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Abstract

The invention discloses a method of removing chromium (VI) and dye pollutants by using plant polyphenol substances for in-situ synthesizing an iron-based material. The method comprises the steps of: 1) performing water-extraction to plant tissue to obtain plant tissue extract liquid, and dissolving iron salt in deionized water to produce an iron salt solution; 2) adding the iron salt solution to the wastewater comprising the Cr (VI) and dyes with uniform mixing, and allowing the liquid to stand for 5-30 min; 3) adding the plant tissue extract liquid with uniform mixing and allowing the liquid to stand for a reaction for 2-48 h. In the method, the iron salt, which is abundant in environment, is used as a precursor; and plant extract liquid (such as green tea) is used as a chelating agent and a reducing agent for iron ions. By adding the raw materials to a polluted field or a pollutant treatment reactor system, the iron-based material, which has stable reducing property, is produced in situ, so that the target pollutants are high-effectively degraded. The method achieves recovery in situ, is green and pollution-free, has high activity and good cyclic property, is high in effect and is economical, is easy to control and has wide available range. The method also can be used in recovery of chromium.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control and restoration. More specifically, it relates to a method for removing hexavalent chromium and dye pollutants by in-situ synthesis of iron-based materials using plant polyphenols. Background technique [0002] With the rapid development of modern industry and the continuous improvement of people's living standards, various chemical raw materials are widely used in life and production, and they also have the risk of environmental pollution while meeting people's needs. Among them, the environmental pollution problems highlighted by heavy metals and organic dyes are particularly severe because of their widest application. Heavy metals mainly include highly toxic elements such as mercury, cadmium, lead, chromium and metalloid arsenic. Among them, chromium is widely used in iron and steel smelting, electroplating, leather, wood preservation and other industries because of it...

Claims

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Application Information

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IPC IPC(8): C02F1/62B09C1/08C02F101/22C02F101/30
CPCC02F1/62B09C1/08C02F2209/06C02F2209/22C02F2101/308C02F2101/22B09C2101/00
Inventor 汪善全王玉仇荣亮
Owner SUN YAT SEN UNIV
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