Attapulgite-loaded zero-valent iron repair material and preparation method thereof

Abstract

The invention provides an attapulgite-loaded zero-valent iron repair material. The attapulgite-loaded zero-valent iron repair material uses attapulgite as a carrier; zero-valent iron is of monodisperse spherical or ellipsoidal morphology; and the average particle size of the zero-valent iron is in a range of 50 to 150 nm. A preparation method for the attapulgite-loaded zero-valent iron repair material comprises the following steps: (1) successively adding a ferric salt or/and a ferrous salt and attapulgite into oxygen-free anoxic water and carrying out stirring under the protection of inert gas so as to obtain mixed liquid; and (2) adding a reducing agent into the mixed liquid and carrying out stirring and solid-liquid separation so as to obtain a solid, i.e., attapulgite-loaded zero-valent iron. The attapulgite-loaded zero-valent iron prepared in the invention can make full use of interlayer and surface space of attapulgite, has better dispersibility and stability and more uniform particle size distribution, is not prone to particle agglomeration and autoxidation and presents better suspensibility and stability in an aqueous solution; and when applied to pollutants, the attapulgite-loaded zero-valent iron has longer reaction time and better adsorption capability.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials and nanometer materials, and in particular relates to an attapulgite-loaded zero-valent iron repair material. [0002] The present invention also relates to a method for preparing the attapulgite-loaded zero-valent iron restoration material. Background technique [0003] Zero-valent iron has many characteristics such as high specific surface area, good catalytic activity, strong adsorption, low cost, and environmental friendliness, and its combination of reduction and adsorption makes it very useful in the degradation and removal of various pollutants. Therefore, it has gradually been widely used in the remediation of various heavy metals and organic pollution, and has a very broad application prospect in the field of environmental protection. [0004] However, zero-valent iron still has many limitations in practical applications. For example, the large s...

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Problems solved by technology

[0004] However, zero-valent iron still has many limitations in practical applications. For example, the large specific surface area of ​​zero-valent iron is easy to cause particle agglomeration reaction, and it is difficult to maintain a stable suspension state, which is not conducive to its full contact reaction with environmental pollutants, which is easy to cause The problem of low efficiency; when zero-valent iron is easily oxidized or even spontaneously combusted when exposed to the air, the surface oxide layer produced will reduce the activity of zero-valent iron particles and affect the treatment effect on pollutants