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Preparation method and application of modified attapulgite adsorbent

A technology for modifying attapulgite and attapulgite, which is applied to chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, and can solve the problems of reducing the removal effect of trivalent chromium in water, achieving low cost and low price Inexpensive, widely available effects

Active Publication Date: 2015-06-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As these adsorbents have a certain removal effect on trivalent chromium in water, but when there are organic complexes in the adsorption system, the removal effect of such adsorbents on trivalent chromium in water will be greatly reduced

Method used

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Examples

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preparation example Construction

[0026] The preparation method of the modified attapulgite adsorbent disclosed by the invention has the following specific steps:

[0027] (1) Acidification of attapulgite

[0028] (2) Amination of attapulgite

[0029] (3) Ethylenediaminetetraacetic acid modified attapulgite

[0030] The used silane coupling agent for modified attapulgite in the present invention is aminopropyltrimethoxysilane (APTES), and the specific method of ethylenediaminetetraacetic acid modified attapulgite adsorbent is as follows:

[0031] (1) Acidification of attapulgite

[0032] Weigh 5g of attapulgite and ultrasonically disperse in 100mL of 1-5mol / L hydrochloric acid solution for 10-20min, and react at 60-80°C for 6-10h, then filter, wash until neutral, dry and set aside .

[0033] (2) Modification of attapulgite.

[0034] Add 2.0 g of acidified attapulgite to a three-necked flask containing 100 mL of toluene (pure toluene), and disperse it ultrasonically for 15 to 30 minutes. Under the protect...

Embodiment 1

[0039] The preparation method of modified attapulgite adsorbent, the specific steps are as follows:

[0040] Weigh 5g of attapulgite and ultrasonically disperse in 100mL of 1mol / L hydrochloric acid solution for 10min, and react at 80°C for 6h, then filter, wash until neutral, dry and set aside. Add 2.0 g of acidified attapulgite to a three-neck flask containing 100 mL of toluene, and disperse it ultrasonically for 15 min. Under the protection of nitrogen gas (60mL / min), when the temperature of the mixed solution was slowly raised to 110°C, 3mLAPTES was added, stirring was continued for 12h, and then filtered and extracted. The modified attapulgite was extracted with absolute ethanol for 12 hours to remove unreacted ATPES, and then vacuum-dried at 70°C for 12 hours to obtain the composite nanomaterial (APTES-ATP) used in the experiment.

[0041] Under nitrogen protection, pipette 100mL of dichloromethane and 0.02mol of EDTA, add thionyl chloride dropwise at constant pressure, ...

Embodiment 2

[0045] The preparation method of modified attapulgite adsorbent, the specific steps are as follows:

[0046] Weigh 5g of attapulgite and ultrasonically disperse in 75mL of 1mol / L hydrochloric acid solution for 15min, and react at 60°C for 10h, then filter, wash until neutral, dry and set aside. Add 2.0 g of acidified attapulgite to a three-necked flask containing 80 mL of toluene, and disperse it ultrasonically for 30 min. Under the protection of nitrogen gas (60mL / min), when the temperature of the mixed solution was slowly raised to 120°C, 5mLAPTES was added, stirring was continued for 18h, and then filtered and extracted. The modified attapulgite was extracted with absolute ethanol for 18 hours to remove unreacted ATPES, and then vacuum-dried at 80°C for 10 hours to obtain the composite nanomaterial (APTES-ATP) used in the experiment.

[0047] Under nitrogen protection, pipette 100mL of dichloromethane and 0.02mol of EDTA, add thionyl chloride dropwise at constant pressure, a...

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Abstract

The invention discloses a preparation method and application of a modified attapulgite adsorbent, and belongs to the technical field of pollution control of a water body. The preparation method comprises the following steps: firstly, carrying out acidification on attapulgite by adopting a hydrochloric acid solution; carrying out amination treatment on the acidified attapulgite; and modifying the attapulgite by ethylenediamine tetraacetic acid to prepare the modified attapulgite adsorbent. The method for preparing the modified attapulgite adsorbent from the attapulgite modified by ethylenediamine tetraacetic acid is simple to operate and has low requirements on equipment; the attapulgite is readily available and the price is low; and the prepared modified attapulgite adsorbent has a good adsorption performance. The modified attapulgite adsorbent prepared by the preparation method can be effectively applied to trivalent chromium treatment of industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of water body pollution control, and in particular relates to a preparation method and application of a modified attapulgite adsorbent. Background technique [0002] With the development of social economy, the discharge of industrial wastewater has become a major environmental problem. The pollution of heavy metals in wastewater is particularly serious, especially chromium pollution. Chromium pollution is mainly caused by trivalent chromium and hexavalent chromium. Although trivalent chromium The toxicity of hexavalent chromium is not as strong as that of hexavalent chromium, but its impact on the environment and human health cannot be ignored. [0003] At present, there are many ways to remove trivalent chromium, such as electrolysis, membrane separation, adsorption, etc. Among the many methods for removing trivalent chromium, adsorption is a simple, fast and effective water treatment method. Adsorbent It ...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F1/62
Inventor 王家宏刘少冲汤伟
Owner SHAANXI UNIV OF SCI & TECH
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