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Modified attapulgite loaded nano zero-valent iron composite material as well as preparation method and application thereof

A technology of nano-zero-valent iron and composite materials, applied in chemical instruments and methods, other chemical processes, restoration of contaminated soil, etc., can solve problems such as inability to exert dispersion effect, increase specific surface area, and limit loading efficiency, and achieve It is convenient for large-scale and industrial production and application, with fast removal rate and high removal effect

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the original attapulgite is a large aggregate, and the tightly combined part cannot play a dispersing role, which greatly limits its loading efficiency (CN111422965A). Therefore, it is necessary to modify the attapulgite to improve its dispersion and increase its specific surface area. Large, improved efficiency of loading nanoscale zero-valent iron

Method used

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  • Modified attapulgite loaded nano zero-valent iron composite material as well as preparation method and application thereof
  • Modified attapulgite loaded nano zero-valent iron composite material as well as preparation method and application thereof
  • Modified attapulgite loaded nano zero-valent iron composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of a modified attapulgite-loaded nano-zero-valent iron composite material

[0050] (1) First, put 5g of attapulgite in a muffle furnace and calcinate at 350°C for 1 hour to remove carbonate and structural water and increase its porosity. Then weigh 1 g of the above-mentioned attapulgite and 0.05 g of anionic surfactant SDS and disperse it in 40 ml of deionized water, sonicate for 0.5 h and then stir for 0.5 h.

[0051] (2) 5g FeCl 3 ·6H 2 O and 200ml of ethanol were added to the mixed solution of step (1), continued to sonicate for 0.5h and then stirred for 0.5h.

[0052] (3) Under nitrogen atmosphere, 25ml of 2wt% sodium borohydride aqueous solution was dropped into the mixed solution of step (2), and the dropping time was 0.5h. Rinse quickly three times with ethanol and deionized water respectively, centrifuge, and vacuum dry at 45°C for 24 hours to obtain the modified attapulgite-loaded nano-zero-valent iron composite material.

[0053] Using infrared...

Embodiment 2

[0055] Preparation of a modified attapulgite-loaded nano-zero-valent iron composite material

[0056] (1) First, put 5g of attapulgite in a muffle furnace and calcinate at 350°C for 1 hour to remove carbonate and structural water and increase its porosity. Then weigh 1 g of the attapulgite and 0.1 g of the anionic surfactant SDS and disperse it in 50 ml of deionized water, sonicate for 0.5 h and then stir for 0.5 h.

[0057] (2) 4.5g FeCl 3 ·6H 2 O and 150ml of ethanol were added to the mixed solution of step (1), and the ultrasonic wave was continued for 0.5h and then stirred for 0.5h.

[0058] (3) Under nitrogen atmosphere, 25ml of 2wt% sodium borohydride aqueous solution was dropped into the mixed solution of step (2), and the dropping time was 1 h. Rinse quickly three times with ethanol and deionized water respectively, centrifuge, and vacuum dry at 45°C for 24 hours to obtain the modified attapulgite-loaded nano-zero-valent iron composite material.

[0059] Use infrar...

Embodiment 3

[0061] Preparation of a modified attapulgite-loaded nano-zero-valent iron composite material

[0062] (1) First, put 5g of attapulgite in a muffle furnace and calcinate at 350°C for 1 hour to remove carbonate and structural water and increase its porosity. Then weigh 1 g of the above-mentioned attapulgite and 0.05 g of SDS and disperse it in 50 ml of deionized water, sonicate for 0.5 h and then stir for 0.5 h.

[0063] (2) 2.5g FeCl 3 ·6H 2 O and 200ml of ethanol were added to the mixed solution of step (1), continued to sonicate for 0.5h and then stirred for 0.5h.

[0064] (3) Under nitrogen atmosphere, 15ml of 2.5wt% sodium borohydride aqueous solution was dropped into the mixed solution in step (2), and the dropping time was 0.5h. Rinse quickly three times with ethanol and deionized water respectively, centrifuge, and vacuum dry at 45°C for 24 hours to obtain the modified attapulgite-loaded nano-zero-valent iron composite material.

[0065] Use infrared spectroscopy to ...

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Abstract

The invention belongs to the technical field of environmental functional nano materials, and discloses a modified attapulgite loaded nano zero-valent iron composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: calcining attapulgite, dispersing the calcined attapulgite and a surfactant in deionized water, and carrying out ultrasonic treatment and stirring to obtain a mixed solution; adding ferric salt and ethanol into the mixed solution, and continuously performing ultrasonic treatment and stirring; under an inert gas atmosphere, dropwise adding a hydroboration salt aqueous solution into the obtained mixed solution; and washing, centrifuging and drying in vacuum to obtain the modified attapulgite loaded nano zero-valent iron composite material. The preparation process is simple, the obtained modified attapulgite loaded nano zero-valent iron composite material has the advantages of high dispersity, uniform particle size, low cost and good biocompatibility, the lead adsorption capacity of the composite material serving as a heavy metal adsorption material can reach 273.39 mg / g, the composite material has the characteristics of high adsorption rate, high removal rate and the like, and the composite material can be used as a heavy metal adsorption material. The method can be widely applied to the field of environmental governance and remediation.

Description

technical field [0001] The invention belongs to the technical field of environmental functional nano-materials, and in particular relates to a modified attapulgite-loaded nano-zero-valent iron composite material and a preparation method and application thereof. Background technique [0002] In recent years, the problem of heavy metal pollution in my country has become increasingly prominent. After heavy metals are discharged into the environment, due to their irreversibility, complexity and long-term nature, they will have obvious cumulative effects in organisms, endangering human health and life safety. Therefore, the prevention and control of heavy metal pollution in the environment has always been a research hotspot at home and abroad. Common repair methods include engineering physics technology, chemical passivation technology, microbial repair technology and phytoremediation technology, among which chemical passivation repair refers to complex adsorption with heavy met...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/30B09C1/08C02F1/28C02F101/20
CPCB01J20/0229B01J20/12C02F1/281B09C1/08C02F2101/20Y02P10/20
Inventor 章莉娟王慧琳杨谦
Owner SOUTH CHINA UNIV OF TECH
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