Study On The Application Of Nanoscale Zero-valent Iron In The Treatment Of TNT Red Water

In this study, nanoscale zero-valent iron (NZVI) preparation and stabilization weresimultaneously carried out in a non-deoxygenated system. The prepared NZVI was used to treatorganic compounds in TNT red water. The results showed that all nitro aromatic compounds inthe TNT red water were completely transferred into corresponding amino compounds, which aremore biological degradable than their parent compounds. The transformation mechanism wasfound to be a reduction behavior associated with adsorption. The results of comparisonexperiments revealed that dinitrotoluene sulfonates could hardly be reduced by normsl ZVIunless with acid addition. The reaction rate constants were much lower than those gained withNZVI. Moreover, only part of the nitro groups in nitro aromatic compounds was reduced toamino groups. The high reduction capacity of NZVI under near neutral pH condition, may bedue to its characteristics such as increased surface area, size-and shape-dependent catalyticproperties, and corrosion behavior. In addition, the factors such as dosage of NZVI, initialconcentration of DNTS, the initial pH value of treated solution, and ultrasonication treatmentwere also studied to investigate their effect on reduction efficiency of DNTS by NZVI throughbatch experiments.