Iron-clay as a reusable heterogeneous Fenton-like catalyst for decolorization of Acid Green 25

Abstract

Decolorization of Acid Green 25 (AG25) was achieved by using Fe-Ipoh clay (Fe-IC) as catalyst on Fenton-like process. The catalyst was prepared by impregnation method and was characterized.The effect of various parameters such as catalyst calcination temperature and duration of time, pH, initial concentration of hydrogen peroxide (H₂O₂) and AG25, catalyst dosage, and reaction temperature was studied. The best performance of AG25 decolorization was found to be 95% after 2 h of reaction by using 1.25 g/L catalyst dosage of Fe-IC calcined at 500°C for 6 h and 6.7 mM of H₂O₂ at pH 3. Besides, the developed catalyst also indicated an advantage of low iron leaching and ability for reuse up to three runs, with slightly reduced decolorization of AG25 from 95 to 93% at the same reaction time.

Keywords:

• Heterogeneous Fenton process
• Reusability
• Clay
• Acid Green 25
• Low ion leaching

Acknowledgments

The authors acknowledge the research grant from Universiti Sains Malaysia, under short-term grant (Project No 6039004) and also the financial support from National Science Fellowship (NSF), Ministry of Science, Technology and Innovation (MOSTI), Malaysia.