Preparation and application of metal vanadium efficient adsorption-reduction material taking waste green tea residues as raw material

A technology for green tea residues and raw materials, applied in the fields of environmental engineering and groundwater pollution control, can solve problems such as environmental pollution and waste of biological resources, and achieve the effects of high adsorption capacity, strong reducing ability, and reducing the frequency of replacement of fillers and operating costs.

Pending Publication Date: 2022-01-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of tea processing and consumption, more than 200,000 tons of tea dregs are produced on average every year, which not only pollutes the environment, but also causes a huge waste of biological resources

Method used

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  • Preparation and application of metal vanadium efficient adsorption-reduction material taking waste green tea residues as raw material
  • Preparation and application of metal vanadium efficient adsorption-reduction material taking waste green tea residues as raw material
  • Preparation and application of metal vanadium efficient adsorption-reduction material taking waste green tea residues as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of green tea dregs biochar loaded zero-valent iron material is as follows:

[0025] 1) crush the green tea dregs and pass through a 40-mesh sieve, and place in a tube furnace (N 2 atmosphere) at a constant temperature of 300°C for 2 hours, and take it out after cooling. Wash with deionized water and absolute ethanol several times, and dry for 20 h. Grind and dry the biochar to pass through 100 mesh, and set aside.

[0026] 2) Weigh 5.85g biochar and add to 100mL FeSO 4 In the solution, the mass ratio of iron to carbon is 1, sealed with a parafilm and then shaken and impregnated in a constant temperature shaking box.

[0027] 3) Stir the impregnated mixture fully under the protection of nitrogen, add 50mL of absolute ethanol, and slowly drop 1mol L -1 The sodium borohydride solution was stirred for a period of time and then centrifuged to separate the precipitate. After washing, put it in a vacuum drying oven to dry for 12 hours, take it out an...

Embodiment 2

[0030] Repeat the preparation process of Example 1, the difference is that in step 1), the green tea residue is placed in the tube furnace (N 2 atmosphere) at a constant temperature of 500°C for 2 hours.

Embodiment 3

[0032] Repeat the preparation process of Example 1, the difference is that in step 1), the green tea residue is placed in the tube furnace (N 2 atmosphere) at a constant temperature of 700°C for 2 hours.

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Abstract

The invention provides preparation and application of a metal vanadium efficient adsorption-reduction material taking waste green tea residues as a raw material. The green tea residues are composed of 17%-28% of crude protein, 16%-35% of crude fiber, 2%-3% of free amino acid, 1%-2% of tea polyphenol, 0.1%-0.3% of caffeine and the like. After the green tea residues are pyrolyzed into biochar, the variety and number of functional groups of unsaturated bonds on the surface are large, and the original vanadium adsorption capacity is obviously superior to that of other biochar. Zero-valent iron modification is carried out on the surface and pore channels of the green tea residue biochar, the pore channel structure of the biochar is optimized, the reducing capacity of the biochar is enhanced, the vanadium adsorption capacity is improved, and efficient adsorption-reduction of vanadium is achieved. After modification, the adsorption capacity is improved by 3.48-11.28 times, the adsorption rate is improved by 20-36 times, pentavalent vanadium is reduced into tetravalent vanadium with low toxicity, and the toxicity is reduced by 70% or above. The material is simple and convenient in synthesis method and excellent in repairing effect, can be applied to scenes such as a permeable reactive barrier technology or vanadium pollution emergency treatment, remarkably reduces the early-stage investment and operation cost of a project, and has a good practical application prospect.

Description

technical field [0001] The invention relates to the field of groundwater pollution control, belongs to the technical field of environmental engineering, and specifically relates to the preparation and application of a metal vanadium high-efficiency adsorption-reduction material using waste green tea dregs as a raw material. Background technique [0002] In 1996, the pollutant "vanadium" was listed as the first category of pollutants in the "Integrated Wastewater Discharge Standard" (GB 8978-1996). As an important raw material to promote my country's industrial development, a large amount of vanadium ore is mined and smelted, resulting in a large amount of vanadium entering the environment. Vanadium in the environment can enter the human body through breathing, eating, etc., and the intake concentration is higher than 0.5mg L -1 Vanadium will cause damage to human health. Vanadium has a variety of valences, generally there are +2 valence, +3 valence, +4 valence and +5 valen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/70C02F101/20C02F103/06
CPCB01J20/20C02F1/283C02F1/705C02F2101/20C02F2103/06B01J2220/4887
Inventor 林爱军谭笑易华炜崔骏张胤杰
Owner BEIJING UNIV OF CHEM TECH
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