Research Progress on Removal of Nitrate Nitrogen in Water by Nano-Zero-Valent Iron
The harm of nitrate nitrogen(NO3--N)in water poses a serious threat to human health and ecological environment.Nano-zero-valent iron(nZVI)can quickly remove NO3--N in water by chemical reaction denitrification technology,but there are problems such as low selectivity of nitrogen(N2)and unsatisfactory removal rate of NO3--N.The basic principle,influencing factors and modification methods to improve the removal efficiency and N2 selectivity of nZVI in the reduction of NO3--N were discussed by summarizing the removal technology of nZVI.By loading nanomaterials,surface activators and reducing agents,the NO3--N removal rate and N2 selectivity will be improved to varying degrees.Different modification methods have different modification effects on nZVI,which also determines the removal of NO3--N by nZVI composites and the improvement of nitrogen selectivity.
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