ABSTRACT
Background: Discharge of colored sewages, resulting from domestic and industrial wastewaters, results in eutrophication, coloring and hypoxia of waters. Furthermore, colors have mutagenic and carcinogenic effects. This study aimed to investigate the removal rate of acid black 1 dye from aqueous solution using nano-iron particles.
Materials and methods: This study was done experimentally and discontinuously in lab scale. The effect of variables such as contact duration [30, 60, 90, 120, 150 and 180 min], pH [3, 7 and 11], adsorbent dose [0.4, 0.8, 1.2 and 1.6 g/200ml] and dye concentration [50, 150 and 200 mg/l] were evaluated on the removal rate of dye from aqueous solution. The data were analyzed using Excel software.
Results: The results showed that with increase in contact duration, the removal efficiency of dye also increased from 92.85 percent to 99.17 percent. Also, the increase in adsorbent concentration resulted in increase in removal efficiency of dye from 62.11 percent to 99.1 percent. A decrease in pH and dye concentration also increased removal efficiency of dye from 53.71 percent to 99 percent, and from 99.97 to 100 percent, respectively. The results of isothermal study showed that the removal of acid black 1 dye from aqueous solution follows from the Langmuir equation [0.999
Conclusion: According to the results obtained, on an equal condition, nano-iron particles are more efficient than other adsorbents in the removal of dye from aqueous solution; hence these nano-particles are suggested for removal of dyes from polluted waters.