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Tea polyphenol-modified graphene-loaded nano-iron material, and preparation method and application thereof

A technology of tea polyphenols and graphene, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of poor dispersibility, weak oxidation resistance, application limitations, etc., and achieve reduced aggregation. , strong adsorption capacity, the effect of improving efficiency

Inactive Publication Date: 2019-01-29
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of high concentration of nZVI, due to the action of magnetism and van der Waals force, nZVI tends to agglomerate, and the particles enter the mesopores of the aqueous medium to form large particles, which reduces the surface area of ​​nZVI, resulting in poor dispersion and weak oxidation resistance. Its application in groundwater remediation and pollutant treatment is limited

Method used

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  • Tea polyphenol-modified graphene-loaded nano-iron material, and preparation method and application thereof
  • Tea polyphenol-modified graphene-loaded nano-iron material, and preparation method and application thereof
  • Tea polyphenol-modified graphene-loaded nano-iron material, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] (1) Take 1g FeSO 4 ·7H 2 O was added to 120mL of ethanol solution with a volume fraction of 30%, stirred to make it dissolve completely to form a mixed solution;

[0038] (2) Under closed conditions, feed nitrogen protection, accurately weigh graphene by mass ratio=1:4 of Fe simple substance in the reaction system: graphene and join in the mixed solution that step (1) obtains, add 0.33mL PEG-400, ultrasonically dispersed for 30min, at a stirring frequency of 500rpm, 10ml of tea polyphenol aqueous solution with a concentration of 100g / L was added dropwise and reacted for 25min, filtered and vacuum-dried at 50°C for 12h to obtain the tea polyphenol-modified graphene Loading nano-iron material.

Embodiment 2

[0040] (1) Take 1g FeSO 4 ·7H 2 O was added to 120mL of ethanol solution with a volume fraction of 30%, stirred to make it dissolve completely to form a mixed solution;

[0041] (2) Under closed conditions, feed nitrogen protection, accurately weigh graphene by mass ratio=1:4 of Fe simple substance in the reaction system: graphene and join in the mixed solution that step (1) obtains, add 0.33mL PEG-400, ultrasonically disperse for 30min, at a stirring frequency of 500rpm, add 10ml of tea polyphenol aqueous solution with a concentration of 100g / L dropwise and react for 75min, filter and vacuum dry at 50°C for 12h to obtain the tea polyphenol-modified graphene Loading nano-iron material.

Embodiment 3

[0043] (1) Take 1g FeSO 4 ·7H 2 O was added to 120mL of ethanol solution with a volume fraction of 30%, stirred to make it dissolve completely to form a mixed solution;

[0044] (2) Under closed conditions, feed nitrogen protection, accurately weigh graphene by mass ratio=1:4 of Fe simple substance in the reaction system: graphene and join in the mixed solution that step (1) obtains, add 0.33mL PEG-400, ultrasonically dispersed for 30min, at a stirring frequency of 500rpm, 10ml of tea polyphenol aqueous solution with a concentration of 100g / L was added dropwise and reacted for 150min, filtered and vacuum-dried at 50°C for 12h to obtain the tea polyphenol-modified graphene Loading nano-iron material.

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Abstract

The invention belongs to the field of nano material preparation, and particularly discloses a tea polyphenol-modified graphene-loaded nano-iron material, and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding FeSO4.7H2O to an ethanol solution so as to form a mixed solution; and (2) adding graphene to the mixed solution under closed conditions of protective gas, then adding a dispersant, performing ultrasonic dispersion, adding a tea polyphenol aqueous solution under a condition of stirring, carrying out a reaction, and performing filtration and vacuum drying so as to obtain the tea polyphenol-modified graphene-loaded nano-iron material. The prepared tea polyphenol-modified graphene-loaded nano-iron material is added to 250mL of ahexavalent chromium (Cr<6+>) solution with a concentration of 150 mg / L, the removal rate can reach 96-98% within 200 min through testing, and compared with existing adsorption materials, the tea polyphenol-modified graphene-loaded nano-iron material has an improved adsorption effect.

Description

technical field [0001] The invention belongs to the field of nano-material preparation, and in particular relates to a tea polyphenol-modified graphene-loaded nano-iron material and a preparation method and application thereof. Background technique [0002] Chromium and its compounds are essential raw materials for metal processing, metallurgical industry, tanning, electroplating, paint, printing and dyeing, pharmaceuticals, photographic plate making and other industries. Due to the inability to effectively control the chromium-containing wastewater produced by these industries, chromium discharge has become one of the more serious water pollution. Chromium mainly exists in the form of Cr(III) and Cr(VI) in the environment. Cr(III) is an important micronutrient for the biological activity of insulin, which is relatively stable and has low solubility in aqueous solution. Compared with Cr(III), Cr(VI) has a hundred times higher biological toxicity, strong carcinogenicity, and...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/22
CPCB01J20/22B01J20/0229B01J20/0281B01J20/20C02F1/288C02F2101/22
Inventor 万俊杰冯新何锦强刘志峰林汝聪刘永璇杨创新何雅静淘海波梁婉琪梁志澎林达武
Owner GUANGDONG IND TECHN COLLEGE
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