The reduction of nitrobenzene (ArNO₂) was investigated in a zero-valent iron system (Fe₀)with the addition of ferrous ions (Fe²⁺) using batch tests. The results indicated that the reductive product of nitrobenzene was not changed with the addition of Fe²⁺, and ArNO₂was reduced to aniline by Fe₀. The reductive reaction rate of ArNO₂was apparently enhanced due to the addition of Fe²⁺, however, Fe²⁺was not the major reducing agent. The reductive reaction can be described using a pseudo-first-order kinetic model, and the observed pseudo-first-order rate constants (k_obs) increased with the increasing of Fe²⁺concentration, indicating that the presence of Fe²⁺ accelerated the reduction of ArNO₂ by Fe₀.