Preparation method of activated-carbon multi-point-location supported nano zero-valent iron composite material

Abstract

The invention provides a method for preparing a composite material of activated carbon loaded with nanometer zero-valent iron, comprising the following steps: Step 1: adding microcrystalline cellulose solution and citric acid to the activated carbon, and hydrothermally reacting to prepare modified activated carbon; Step 2 : Polyethylene glycol is dissolved in ultrapure water to prepare a dispersant solution; Step 3: FeSO4·7H2O is dissolved in the dispersant solution, stirred magnetically under nitrogen protection, and slowly dripped into NaBH4 solution to obtain Activated carbon multi-site loaded nano zero-valent iron composite material. The invention prepares multi-point activated carbon, increases the active sites of activated carbon to a large extent, and effectively improves the loading capacity of nano-zero-valent iron; uses polyethylene glycol solution as a dispersant, so that nano-zero-valent iron particles are evenly loaded on the activated carbon , good dispersion, and improve the catalytic degradation ability of the composite material to pollutants; polyethylene glycol is non-toxic and has good stability, and the residual components will not cause secondary pollution during the repair process.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method of activated carbon multi-point loaded nanometer zero-valent iron composite material. Background technique [0002] With the rapid development of our country's society and economy, the problem of environmental pollution is becoming more and more prominent, and its negative impact is also becoming more and more significant. Therefore, it is more and more urgent to strengthen the research and development of environmental pollution control materials. [0003] As a new type of repair material, nano-zero-valent iron has the advantages of small particles, large specific surface area and high reactivity. Therefore, nano-zero-valent iron has gradually become a research hotspot at home and abroad. However, in the process of application, a single nanometer zero-valent iron material exposes many disadvantages, such as due to the nanoscale effect, it is prone to agg...

AI Technical Summary

Problems solved by technology

[0004] Activated carbon is a cheap adsorbent that is widely used, and it can still maintain its adsorption capacity after many cycles of operation. However, ordinary activated carbon has poor adsorption selectivity and limited adsorption capacity.

Loading nano-zero-valent iron particles on ordinary activated carbon can increase the surface area of ​​nano-zero-valent iron particles to a certain extent, increase the contact area between nano-zero-valent iron and pollutants, and weaken the agglomeration effect of nano-zero-valent iron particles. Due to the limited loading sites of activated carbon, its loading capacity is still low, and it cannot effectively enhance the adsorption effect of nano zero-valent iron on pollutants.

The invention patent with the authorization number CN104014812B discloses a method for preparing activated carbon-loaded nano-zero-valent iron composite materials. The liquid-phase reduction method is used to prepare activated carbon-loaded nano-zero-valent iron in an ethanol water system, but the highest loading capacity is only 0.4 (the quality / quality of activated carbon), it is not yet possible to greatly increase the loading capacity of nanometer zero-valent iron

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