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Organic modified granular bentonite/attapulgite absorbent and preparation method thereof

A technology of attapulgite and bentonite, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of low strength of granular bentonite, affecting the application of granular bentonite, weak adsorption capacity of pollutants, etc. To achieve the effect of good adsorption performance, large particle size and large particle size

Inactive Publication Date: 2014-10-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bentonite has better adsorption and adsorption properties to hydrophobic organic matter after the surface modification of surfactant (S. Andini, R. Cioffi, L. Santoro, et al. Simultaneous adsorption of chlorophenol and heavy metal ions on organophilic bentonite . Applied Clay Science. 2006, 31:126-133.), but what S. Andini modified with benzyl dimethyl octadecyl ammonium chloride is powdered bentonite, and bentonite itself has swelling properties, and modified The treatment of wastewater with powdered bentonite will cause the problem of difficult separation of solid and liquid, and eventually cause the problem of secondary pollution
[0004] Granular bentonite has a large particle size and is easy to settle in water, but the strength of granular bentonite is not high, which affects the application of granular bentonite in wastewater treatment. The adsorption capacity of pollutants in wastewater is also weak

Method used

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  • Organic modified granular bentonite/attapulgite absorbent and preparation method thereof
  • Organic modified granular bentonite/attapulgite absorbent and preparation method thereof
  • Organic modified granular bentonite/attapulgite absorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An organically modified granular bentonite / attapulgite adsorbent and a preparation method thereof. Its specific steps are:

[0029] Step 1, using bentonite powder and attapulgite powder as raw materials, mixing to obtain powdery bentonite / attapulgite; then adding water to the powdery bentonite / attapulgite, and mixing evenly to obtain muddy lump bentonite / attapulgite; Then, the mud-shaped bentonite / attapulgite is dried for 16-20 hours under the condition of 105-110° C. to obtain the block-shaped bentonite / attapulgite.

[0030] Among them: the mass ratio of bentonite powder: attapulgite powder is 1: (0.1~0.2); the mass ratio of powdered bentonite / attapulgite: water is 1: (1.8~2).

[0031] Step 2, crushing the massive bentonite / attapulgite to a particle size of 0.9-2mm to obtain granular bentonite / attapulgite, and then calcining the granular bentonite / attapulgite at 750-850°C for 2-2.5 h, obtained calcined granular bentonite / attapulgite.

[0032] Step 3, under the condi...

Embodiment 2

[0037] An organically modified granular bentonite / attapulgite adsorbent and a preparation method thereof. Its specific steps are:

[0038] Step 1, using bentonite powder and attapulgite powder as raw materials, mixing to obtain powdery bentonite / attapulgite; then adding water to the powdery bentonite / attapulgite, and mixing evenly to obtain muddy lump bentonite / attapulgite; Then, the mud-shaped bentonite / attapulgite is dried for 20-24 hours under the condition of 100-105° C. to obtain the block-shaped bentonite / attapulgite.

[0039] Among them: the mass ratio of bentonite powder: attapulgite powder is 1: (0.2~0.3); the mass ratio of powdered bentonite / attapulgite: water is 1: (1.4~1.6).

[0040] Step 2, crushing the massive bentonite / attapulgite to a particle size of 0.45~0.9mm to obtain granular bentonite / attapulgite, and then calcining the granular bentonite / attapulgite at 650~750°C for 2~ After 2.5 hours, calcined granular bentonite / attapulgite was obtained.

[0041] Step ...

Embodiment 3

[0046] An organically modified granular bentonite / attapulgite adsorbent and a preparation method thereof. Its specific steps are:

[0047] Step 1, using bentonite powder and attapulgite powder as raw materials, mixing to obtain powdery bentonite / attapulgite; then adding water to the powdery bentonite / attapulgite, and mixing evenly to obtain muddy lump bentonite / attapulgite; Then, the mud-shaped bentonite / attapulgite is dried for 24-28 hours under the condition of 95-100° C. to obtain the block-shaped bentonite / attapulgite.

[0048] Among them: the mass ratio of bentonite powder: attapulgite powder is 1: (0.3~0.4); the mass ratio of powdered bentonite / attapulgite: water is 1: (1.6~1.8).

[0049] Step 2, crushing the massive bentonite / attapulgite to a particle size of 0.2-0.45mm to obtain granular bentonite / attapulgite, and then calcining the granular bentonite / attapulgite at 650-700°C for 2~ After 2.5 hours, calcined granular bentonite / attapulgite was obtained.

[0050] Step...

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Abstract

The invention relates to an organic modified granular bentonite / attapulgite absorbent and a preparation method thereof. The preparation method adopts the technical scheme that bentonite powder and attapulgite powder are taken as main raw materials and mixed at the mass ratio of 1:(0.1-0.5); the mixture of the bentonite powder and the attapulgite powder is uniformly mixed with water at the mass ratio of 1:(1.2-2),dried for 16-32h at 90-110 DEG C, crushed into granular bentonite / attapulgite with the grain size of 0.2-2 mm and then calcined for 2-2.5 h at 550-850 DEG C; finally, the calcined granular bentonite / attapulgite is modified with a surface active agent, which is 50-400 percent CEC (Cation Exchange Capacity) of the calcined granular bentonite / attapulgite, under a stirring condition to obtain the organic modified granular bentonite / attapulgite absorbent. The preparation method is simple in process and causes no secondary pollution; the prepared organic modified granular bentonite / attapulgite absorbent has the characteristics of large grain size, excellent adsorption property and high strength and is applicable to treatment of wastewater containing chlorophenol.

Description

technical field [0001] The invention belongs to the technical field of adsorbents. In particular, it relates to an organically modified granular bentonite / attapulgite adsorbent and a preparation method thereof. Background technique [0002] Chlorophenols are a common class of toxic, harmful and difficult to degrade pollutants. The treatment methods of chlorophenol-containing wastewater include chemical, biological and physical methods. Chemical treatment of wastewater containing chlorinated phenols has the characteristics of high efficiency and good treatment effect, but the disadvantages of chemical methods are high treatment cost, long treatment time and secondary pollution; biological treatment of wastewater containing chlorinated phenols has relative cost The characteristics of low and no secondary pollution, but microorganisms have high requirements on the quality of wastewater, and they must be fixed and domesticated to strengthen their ability to degrade chloropheno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28
Inventor 刘红秦雄杨恩范先媛
Owner WUHAN UNIV OF SCI & TECH
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