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Method for preparing attapulgite/carbon adsorbent based on hydrothermal-activation coupling technology

A technology of attapulgite and carbon adsorbent, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of low specific surface area, low specific surface area of ​​clay minerals, etc. Pure, low ash, stable performance

Active Publication Date: 2016-08-31
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although clay mineral adsorbents have the advantages of wide range of sources and low price, the specific surface area of ​​clay minerals is generally low, for example, the specific surface area of ​​attapulgite is about 100m 2 / g, which is much lower than the specific surface area of ​​commonly used adsorbent activated carbon (1000-3000m 2 / g)

Method used

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  • Method for preparing attapulgite/carbon adsorbent based on hydrothermal-activation coupling technology
  • Method for preparing attapulgite/carbon adsorbent based on hydrothermal-activation coupling technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take attapulgite 2.5g as it is, add 5g of cellulose, mix with 70mL of distilled water, then add 2.801g of ferrous ammonium sulfate, and ultrasonically disperse to obtain a mixed solution. At this time, the pH value of the mixed solution is 5; Transfer to a polytetrafluoroethylene hydrothermal kettle, keep the filling rate at 75%, react at 220°C, and carbonize for 12 hours; naturally cool to room temperature after the reaction, centrifuge, wash with water and ethanol alternately until neutral, and dry at 60°C A black product was obtained.

[0030] Weigh 2gZnCl 2 The solid is dissolved in water, and 1 g of the above hydrothermal product is added to the ZnCl 2 In the solution, stir or ultrasonically disperse evenly, dry after soaking for 24 hours.

[0031] The dried samples were placed in a horizontal tube activation furnace, N 2 Under the protection of the atmosphere, the temperature was raised to 500°C at 5°C / min and kept for 60min. After cooling to room temperature,...

Embodiment 2

[0035] The preparation method of the hydrothermal product is the same as in Example 1.

[0036] Weigh 1gZnCl 2 Dissolve the solid in water, take 1g of the above hydrothermal product and add it to ZnCl2 In the solution, stir or ultrasonically disperse evenly, immerse for 4 hours and then dry.

[0037] The dried samples were placed in a horizontal tube activation furnace under N 2 Under the protection of the atmosphere, the temperature was raised to 550°C at 5°C / min and kept for 30min. After cooling to room temperature, wash with 1.2mol / L hydrochloric acid solution, then wash with hot water at 70°C until the pH is 7, and dry at 60°C to obtain the activated product.

[0038] The measured BET specific surface area of ​​the obtained sample is 799m 2 / g, which is higher than the specific surface area of ​​attapulgite raw ore (see Table 1).

[0039] Take the methylene blue solution with an initial concentration of 100mg / L as the simulated organic wastewater, add the above-mention...

Embodiment 3

[0041] The preparation method of the hydrothermal product is the same as in Example 1.

[0042] Weigh 1gZnCl 2 Dissolve the solid in water, take 1g of the above hydrothermal product and add it to ZnCl 2 In the solution, stir or ultrasonically disperse evenly, immerse for 12 hours and then dry.

[0043] The dried samples were placed in a horizontal tube activation furnace under N 2 Under the protection of the atmosphere, the temperature was raised to 500°C at 5°C / min and kept for 60min. After cooling to room temperature, wash with 1.2mol / L hydrochloric acid solution, then wash with hot water at 70°C until the pH is 7, and dry at 60°C to obtain the activated product.

[0044] The measured BET specific surface area of ​​the obtained sample is 1151m 2 / g, which is higher than the specific surface area of ​​attapulgite raw ore and activated carbon (see Table 1).

[0045] Take the methylene blue solution with an initial concentration of 100mg / L as the simulated organic wastewat...

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Abstract

The invention relates to a method for preparing an attapulgite / carbon adsorbent based on a hydrothermal-activation coupling technology. The method provided by the invention comprises the following steps: mixing attapulgite with cellulose, preparing an attapulgite / carbon material by a heterogeneous hydrothermal synthesis method, further dipping the attapulgite / carbon material after washing and drying into a ZnCl2 solution, drying a sample after dipping, placing into an activation furnace, heating at the rate of 5 DEG C / min in a nitrogen protective atmosphere to 400-550 DEG C, performing heat preservation for 30-75min, soaking an obtained product with hydrochloric acid, further washing with hot distilled water for several times, and finally placing into a blowing drying box to dry at the temperature of 60 DEG C to obtain a final product. Raw materials used in the method are from the nature, thereby being pure in sources, low in price, simple to operate and low in energy consumption. The nano-scale composite attapulgite / carbon material prepared by the invention has uniform appearance, high specific surface area of above 1000m<2> / g and relatively strong adsorption capacity against typical organic pollutants.

Description

technical field [0001] The invention relates to a method for preparing attapulgite / carbon adsorbent, in particular to a method for preparing attapulgite / carbon adsorbent based on hydrothermal-activation coupling technology. Background technique [0002] Attapulgite is a natural nano-scale layered hydrated magnesium aluminum silicate mineral, which has a wide range of sources, low price, excellent physical and chemical properties, rich pore structure and certain specific surface area, and has strong resistance to inorganic metal ions. adsorption properties. Therefore, attapulgite has been widely used in various fields, including total metal ions and dye adsorbents and catalyst supports, but because attapulgite surface has strong hydrophilicity, the adsorption of attapulgite on organic pollutants There are still major limitations in performance. [0003] The traditional organophilic modification method of attapulgite mainly adopts surfactant modification, such as using surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30
CPCB01J20/20B01J20/28066B01J2220/42
Inventor 吴雪平程丽萍张先龙吴玉程
Owner HEFEI UNIV OF TECH
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