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Method for improving adsorption property of attapulgite by using hydrothermal process

A technology of attapulgite and adsorption performance, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of high energy consumption, high cost, cumbersome modification methods, etc. The effect of improving adsorption performance and increasing specific surface area

Inactive Publication Date: 2013-07-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification of surfactants and coupling agents has the disadvantages of cumbersome modification methods and high costs.
Attapulgite modified by high-temperature calcination, the reaction temperature reaches at least 500°C, the energy consumption is large, and the removal rate of methylene blue is only 69%

Method used

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  • Method for improving adsorption property of attapulgite by using hydrothermal process
  • Method for improving adsorption property of attapulgite by using hydrothermal process
  • Method for improving adsorption property of attapulgite by using hydrothermal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Pulverize the attapulgite clay ore with a content of 95wt% attapulgite and pass it through a 200-mesh sieve to obtain attapulgite powder, take 1 g of attapulgite powder, add 16 mL of distilled water, stir with a magnetic stirrer for 2 hours, and mix the solution uniformly to obtain a mixed solution , the pH value of the mixture was measured at 7;

[0023] The mixed solution was transferred to a polytetrafluoroethylene hydrothermal kettle, the reaction temperature was 110 °C, and the reaction time was 12 h; after the reaction, it was naturally cooled to room temperature, centrifuged, washed with water, and dried at 60 °C to obtain the modified unevenness. stick rock.

[0024] It can be seen from the infrared spectrum analysis that after hydrothermal treatment, at 1656 cm -1 The intensity of the peaks is weakened. This is because during the hydrothermal reaction, the attapulgite removes water molecules of different forms, thereby weakening the intensity of the peaks (se...

Embodiment 2

[0028] Pulverize the attapulgite clay ore with a content of 95wt% attapulgite and pass through a 200-mesh sieve to obtain attapulgite powder, take 1g of attapulgite powder, add 8mL of distilled water, stir with a magnetic stirrer for 2h, and mix the solution uniformly to obtain a mixed solution , the pH value of the mixture was measured at 7;

[0029] The mixed solution was transferred to a polytetrafluoroethylene hydrothermal kettle, the reaction temperature was 110 °C, and the reaction time was 12 h; after the reaction, it was naturally cooled to room temperature, centrifuged, washed with water, and dried at 60 °C to obtain the modified unevenness. stick rock.

[0030] It can be seen from the BET value analysis that the BET value of the obtained modified attapulgite is 225, which is higher than that of the original attapulgite (see Table 1).

[0031] Take the methylene blue solution with an initial concentration of 500mg / L as the organic pollutant, the solid-liquid ratio of...

Embodiment 3

[0033] Pulverize the attapulgite clay ore with a content of 95wt% attapulgite and pass through a 200-mesh sieve to obtain attapulgite powder, take 1g of attapulgite powder, add 32mL of distilled water, stir with a magnetic stirrer for 2h, and mix the solution uniformly to obtain a mixed solution , the pH value of the mixture was measured at 7;

[0034] The mixed solution was transferred to the polytetrafluoroethylene hydrothermal kettle, the reaction temperature was 110°C, and the reaction time was 12h; after the reaction was finished, it was naturally cooled to room temperature, and after centrifugation and washing with water, drying was performed at 60°C to obtain a modified solution. Sexual attapulgite.

[0035] It can be seen from the BET value analysis that the BET value of the obtained modified attapulgite is 216, which is higher than that of the original attapulgite (see Table 1).

[0036] Take the methylene blue solution with an initial concentration of 500mg / L as the...

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Abstract

The invention discloses a method for improving the adsorption property of an attapulgite by using a hydrothermal process. The attapulgite is treated by using the hydrothermal process, and treatment parameters such as reaction temperature, reaction time and raw material concentration are optimized, so that the adsorption property of the attapulgite can be remarkably improved. Compared with a natural attapulgite, the attapulgite subjected to hydrothermal treatment has the advantages that the specific surface area of the attapulgite is remarkably increased, and the equilibrium adsorption capacity of the attapulgite to methylene blue in water is remarkably increased. The equilibrium adsorption capacity of the raw ore of the attapulgite to the methylene blue is 220mg / g, the adsorption capacity of the attapulgite which is subjected to hydrothermal treatment at the temperature of 110 DEG C for 12h to the methylene blue is highest, and the equilibrium adsorption capacity is up to 277.5mg / g which is increased by 26% as comparison with that of the raw ore.

Description

1. Technical field [0001] The invention relates to low-cost hydrothermal modification of attapulgite, and uses the modified attapulgite as an adsorbent to improve its adsorption performance for organic dyes in water, which can be applied to the removal of trace amounts of refractory dyes in water bodies. remove. 2. Background technology [0002] Attapulgite is a natural nano-scale layered hydrated magnesium-aluminosilicate mineral with rich pore structure, large specific surface area and strong adsorption properties. Therefore, attapulgite has been widely used in various fields, including heavy metal ions and dye adsorbents, catalyst supports. However, the surface of attapulgite has strong hydrophilicity, so its adsorption capacity and applicability need to be improved, especially the adsorption performance of organic pollutants is relatively weak. The traditional organophilic modification methods of attapulgite are mainly surfactant modification, such as the use of surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/30C02F103/30
Inventor 吴雪平刘存张先龙张良程丽萍
Owner HEFEI UNIV OF TECH
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