Magnetic tea residue adsorbing material and preparation method thereof

A technology for adsorbing materials and tea residues, which is applied in the field of magnetic tea residue adsorbents and their preparation, can solve the problems of few research and applications, ineffective utilization, and difficult separation of solid and liquid, and achieves wide application range, high utilization value and high utilization rate. Environmentally friendly, low-cost effects

Inactive Publication Date: 2017-11-07
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 201310320360.5 discloses a hydrochloric acid-modified tea dregs adsorbent, the removal rate can reach 96.79%, and the maximum adsorption capacity has been improved, at 149.25mg / g, but in wastewater treatment, solid-liquid is not easy to separate (reference 2 )
After treating the tea dregs, the pore size is enlarged to provide enough active sites for its adsorption performance, and the tea dregs has a large specific surface area and a wide range of sources. However, due to the lack of research and application of the existing technology, it has not been able to be effectively used. this resource

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Ratio Fe 3+ : Fe 2+ =3: 2 Weigh the corresponding amount of FeCl 3 ·6H 2 O and FeSO 4 ·7H 2 Dissolve O in a three-necked flask with 80 mL of distilled water, and fill with N in a constant temperature stirrer 2 Stir vigorously; heat the solution to 80°C and add 20mL 25% NH dropwise at a constant speed 3 ·H 2 O, charge N at the same time 2 Stir vigorously; cool to room temperature, repeatedly wash with distilled water and absolute ethanol to remove unreacted substances. Use a magnet to separate solid and liquid, place it in a vacuum drying oven at 105°C, and grind through a 100-mesh sieve to obtain nano-Fe 3 O 4 powder;

[0038] The magnetic adsorption material was further prepared as follows: Step (1): Treatment of tea dregs, washing with distilled water several times to remove dirt; then boiling in distilled water at 80°C for 1 hour to remove caffeine, tannic acid and pigment; washing with distilled water To be colorless; dried in an oven at 100°C for 12 hours, crushed, pas...

Embodiment 2

[0046] In the complete mixing process for treating dye wastewater: the magnetic adsorbent prepared in Example 1 has a solid-liquid ratio of 4g·L -1 , PH does not need to be adjusted, the contact time is 120min, the removal rate of methylene blue by the magnetic adsorption material can reach more than 98.0%, and it conforms to Langmuir and Freundlich adsorption isotherms and quasi-quadratic kinetic equations. The maximum adsorption capacity can reach 184.5mg·g -1 ; Magnetic adsorption material adsorbent elution-resorption experiment results show that the removal rate of methylene blue by the second and third magnetic adsorption material adsorbents is only 30%, indicating that the binding between the magnetic adsorption material and methylene blue is tight and the force is stronger It is strong and difficult to elute, so this magnetic adsorption material has limited reuse potential, but because it binds to methylene blue more stable, it will not cause secondary pollution.

[0047] cu...

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Abstract

The invention provides a novel magnetic tea residue adsorbing material and a preparation method thereof. The material uses waste tea residues and nano-Fe3O4 as main components. The preparation method mainly comprises tea residue washing, de-coloring, drying, crushing, addition of nano-Fe3O4 powder for a modification reaction, washing after the reaction, solid-liquid separation, drying and grinding. The preparation method fully utilizes the tea residue advantages of pore structure, surface functional group, large specific surface area and good adsorption performance and utilizes combination with nano-Fe3O4 characteristics to produce the novel magnetic tea residue adsorbing material. The novel magnetic tea residue adsorbing material has the characteristics of low price and high recovery rate. Experiment results show that the decolorization efficiency of methylene blue can reach 98.0% or more, has adsorption stability, does not cause secondary pollution, has a very high use value and opens up a new way for the comprehensive utilization of waste tea residues.

Description

Technical field [0001] The invention relates to the field of composite materials, and in particular provides a new type of adsorption material, particularly a magnetic tea residue adsorption material and a preparation method thereof. Background technique [0002] The pollution of dye wastewater, especially methylene blue dye wastewater, has caused extremely serious damage to the environment. Most of the current adsorbents are powdered solids, which makes the separation and recovery of adsorbents very difficult, resulting in extremely low utilization of adsorbents and unable to be recycled. Cause more serious pollution, so this has become a bottleneck restricting the use of powder solid adsorption methods for wastewater treatment. With the depletion of resources and increasing environmental awareness, the development of new magnetic adsorbents has become an effective choice to solve the problem of solid-liquid separation in solid powder adsorption treatment methods. [0003] Chines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/36C02F101/38
CPCB01J20/22B01J20/06C02F1/28C02F1/281C02F1/286C02F2101/36C02F2101/38C02F2101/40
Inventor 王元兰
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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