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A kind of chelating fiber, its synthesis method and the method for enriching hexavalent chromium from serpentine

A technology of chelating fibers and synthesis methods, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as unavailability and environmental pollution, and achieve poor adsorption performance and low price. , the effect of efficient adsorption selectivity

Inactive Publication Date: 2018-02-27
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, serpentine ore is mostly used to extract metal magnesium. Chromium, an important metal resource in the production process, is treated as waste and cannot be used, causing serious environmental pollution problems.

Method used

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  • A kind of chelating fiber, its synthesis method and the method for enriching hexavalent chromium from serpentine
  • A kind of chelating fiber, its synthesis method and the method for enriching hexavalent chromium from serpentine
  • A kind of chelating fiber, its synthesis method and the method for enriching hexavalent chromium from serpentine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of synthetic method of chelating fiber MATF, carries out following steps successively:

[0031] 1) Put about 20.0mg of the matrix---grafted acrylic polytetrafluoroethylene fiber (PTFE-g-AA) into a 100mL three-necked bottle, add 50mL of toluene and soak for 12 hours;

[0032] Remarks: Grafted acrylic polytetrafluoroethylene fiber (PTFE-g-AA) is also known as polytetrafluoroethylene grafted acrylic copolymer, acrylic modified polytetrafluoroethylene fiber, etc. The PTFE-g-AA functional group (that is, -COOH) content in the grafted acrylic polytetrafluoroethylene fiber (PTFE-g-AA) is 3.07mmol / g;

[0033] 2), then add 0.246mmol of the ligand-2-amino-1,2,4-thiadiazole (MAT) into the three-necked flask (that is, the reaction molar ratio of PTFE-g-AA and the ligand is 1 : 4), 35 DEG C of stirring reaction 12 hours, the stirrer rotating speed is 300rpm / min;

[0034] 3), the product obtained in step 2) is filtered, and the obtained filter cake is washed 3 times successi...

Embodiment 2

[0085] The serpentine mineral powder that was ball-milled for 1 hour was refluxed at 100°C for 1 hour with 3mol / L HCl at a solid-to-liquid ratio of 1:4, filtered and separated, and the filtrate was leached with fresh mineral powder to reduce acidity; Taking acid reduction, on the one hand, the pH value of the pickling solution can be adjusted to the range suitable for fiber adsorption of Cr(VI), which is conducive to separation and enrichment; on the other hand, it can increase the concentration of Cr(VI) ions in the pickling solution, Improve the efficiency of the separation and enrichment process; after that, use fiber adsorption technology to separate and enrich Cr(VI) ions in the pickling solution, where the volume of the pickling solution (L): MATF fiber mass (g) = 1:1. Among them, the fiber adsorption technology is to use the adsorption material to adsorb the adsorbate. Adsorption materials commonly used in fiber adsorption technology include activated carbon fibers, alg...

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Abstract

The invention discloses a chelate fiber, its synthesis method and a method for enriching hexavalent chromium from serpentine. The synthesis method of the chelate fiber comprises: 1) using grafted acrylic polytetrafluoroethylene fiber as a matrix, Soak the grafted acrylic polytetrafluoroethylene fibers in toluene for 12-14 hours; 2), add a ligand to the result of step 1), and stir and react at 30-50°C for 11-14 hours; the ligand is 2‑Amino‑1,2,4‑thiadiazole, the molar ratio of parent and ligand is 1:2~6; 3), the product obtained in step 2) is filtered, and the obtained filter cake is washed and dried to constant weight , to obtain the chelating fiber MATF with selective adsorption on Cr(). The chelating fiber MATF synthesized by the invention has high-efficiency selective adsorption performance on hexavalent chromium ions.

Description

technical field [0001] The invention relates to a method for synthesizing a new type of chelating fiber, in particular to grafting acrylic polytetrafluoroethylene fiber (PTFE-g-AA) as a matrix, and 2-amino-1,2,4-thiadiazole ) as a ligand to synthesize a chelating fiber MATF with high-efficiency selective adsorption properties for Cr(VI) ions, which is used to enrich hexavalent chromium from serpentine. Background technique [0002] Serpentine is a general term for hydrous magnesium-rich silicate minerals, such as antigorite, lizardite, and chrysotile. They are dense, greasy, and slightly slippery. They are often green and green like snake skin, hence the name. It is mainly used for firing calcium magnesium phosphate fertilizer, steel-making flux, refractory material, building plate, engraving process, extracting magnesium oxide and porous silicon oxide, and also used in medical treatment, purifying high-fluorine water, and making flunine tablets, etc. Their color is genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62C02F101/22
Inventor 熊春华李建丹厉炯慧张浩缪喜喜
Owner ZHEJIANG GONGSHANG UNIVERSITY
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