Ternary Ni–Fe–Cr hydrotalcite-like compounds (NiFeCr-HTLcs) with different Fe3+/Cr3+ mole ratios were synthesized through coprecipitation method. The materials obtained from different synthesis conditions were characterized by powder X-ray diffraction (XRD). The results indicated that the Ni–Fe–Cr hydrotalcite-like compounds can be synthesized through metal coprecipitation when the pH value was in the range of 7.5–11.0 and the molar ratio of M2+/M3+ was in the range of 2–4. After calcining at 600 °C, the NiFeCr-HTLcs were converted to Ni–Fe–Cr complex metal oxides. The calcined samples showed higher photocatalytic activity than the NiFeCr-HTLcs precursors and their photocatalytic activity increased as the content of Cr rose in the Cr3+/Fe3+ molar ratio range of 0.05–2. The calcined materials which had a Cr3+/Fe3+ molar ratio of 2 possessed the best photocatalytic activity with 85% degradation of methylene blue (MB) dye under visible light irradiation. For the above composition, possible photocatalytic mechanisms are discussed. Moreover, this ternary complex metal oxide system exhibited satisfactory re-usability after four cycles. The facile synthesis process, higher photocatalytic activity under visible light irradiation and satisfactory re-usability enable this complex metal oxide material to be a promising candidate for environmental remediation using visible light.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry