Preparation method of highly dispersed ultra-small zero-valence iron nano-cluster and application

Abstract

The invention discloses a preparation method of a highly dispersed ultra-small zero-valence iron nano-cluster and application, and belongs to the technical field of environmental nanomaterial preparation and organic pollutant treatment. According to the technical scheme, the preparation method comprises the following steps that Fe<3+> is encapsulated in a surfactant CTAB micelle; the release of S<2-> from thiourea is controlled under alkaline condition to form a FeS nanocluster as an intermediate body; and the FeS nanocluster is reduced by NaBH4 to obtain the highly dispersed zero-valence ironnano-cluster with diameter less than 1mm. The invention further discloses application of the of zero-valent iron nanocluster as a catalyst in the catalytic reduction of organic reactions in the presence of the NaBH4. According to the preparation process of the zero-valence iron nano-cluster, condition is mild, operation is simple, and achievement is easy. The zero-valent iron nanocluster has remarkable catalytic reduction activity to nitrophenol in water, and can be reused in the presence of the NaBH4 and maintain high catalytic activity.

Description

Technical field [0001] The invention belongs to the technical field of environmental nanomaterial preparation and organic pollutant treatment, and specifically relates to a preparation method and application of highly dispersed ultra-small zero-valent iron nanoclusters. Background technique [0002] In recent years, nano-zero-valent iron has received extensive attention from scientific researchers due to its high reduction activity, environmental protection and low economic cost. Nano-zero-valent iron particles are often used in wastewater treatment and groundwater remediation. A large number of studies have shown that nano-zero-valent iron is an effective water treatment material that can be used to remove various pollutants, such as nitrite, selenate, antibiotics, aromatic halides and heavy metal pollutants. However, similar to other nanomaterials, nano-zero-valent iron particles are not only aggregated into larger-sized particles driven by strong magnetism and van der Waals fo...

AI Technical Summary

Problems solved by technology

However, various modification materials reported so far cannot control the crystal growth of nano-ZVF to prepare ultra-small metal nanoclusters.

The reactivity and catalytic ability of ultra-fine metal nanoclusters are greatly improved compared with ordinary nanoscale particles. Some people have prepared highly dispersed noble metal nanoparticles with a particle size of less than 1nm, such as palladium and gold. However, due to the Zero-valent iron particles have strong van der Waals force and magnetic attraction, and the synthesis of zero-valent iron nanoclusters with extremely small particle sizes while maintaining their surface activity and avoiding agglomeration is a challenging problem

In addition, even under anoxic environment, nano-ZVI particles are easily oxidized after removal of pollutants, which makes the recovery and recycling of nano-ZVI very difficult.

[0003] So far, through searching, we have not found relevant reports on the preparation and application of zero-valent iron nanoclusters from the information we have.

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