Abstract: Decoloration of simulated wastewater containing dye reactive black K-BR by zero-valent iron was investigated. The results showed that decoloration efficiency increased with decreasing pH or initial dye concentration, and increased with increasing iron loading. The reaction followed first-order kinetics initially but deviated from first-order behavior with increasing time. Considering the decrease of active surface area of zero-valent iron with time,decoloration kinetics was expressed as ln(c/c₀)= K［1-exp(-k_dt)］/k_d.It indicated that k_d was independent of iron loading and pH, and decreased with increasing initialdye concentration. K was proportional to iron loading，and decreased with increasing pH or initial dye concentration.

Key words: 零价铁, 脱色, 活性黑K-BR

关键词: 零价铁, 脱色, 活性黑K-BR