Synthesis of LaFeO3/Ag2CO3 Nanocomposites for Photocatalytic Degradation of Rhodamine B and p-Chlorophenol under Natural Sunlight

Bilal M Pirzada; Pushpendra; Ravi K Kunchala; Boddu S Naidu

doi:10.1021/acsomega.8b02829

Synthesis of LaFeO₃/Ag₂CO₃ Nanocomposites for Photocatalytic Degradation of Rhodamine B and p-Chlorophenol under Natural Sunlight

ACS Omega. 2019 Feb 4;4(2):2618-2629. doi: 10.1021/acsomega.8b02829. eCollection 2019 Feb 28.

Authors

Bilal M Pirzada¹, Pushpendra¹, Ravi K Kunchala¹, Boddu S Naidu¹

Affiliation

¹ Energy and Environment Group, Institute of Nano Science and Technology (INST), Phase-10, Sector-64, Mohali 160062, Punjab, India.

Abstract

Novel LaFeO₃/Ag₂CO₃ nanocomposites are synthesized by co-precipitation method for photocatalytic degradation of Rhodamine B (RhB) and p-chlorophenol under visible light irradiation. Heterostructures between LaFeO₃ and Ag₂CO₃ semiconductors are formed during the synthesis of these nanocomposites. Among the nanocomposites prepared with different ratios of LaFeO₃ and Ag₂CO₃, 1% LaFeO₃/Ag₂CO₃ shows the highest photocatalytic activity for the degradation of RhB. Maximum electron-hole pair decoupling efficiency is observed in 1% LaFeO₃/Ag₂CO₃, which causes the greater activity of the heterostructure. Degradation efficiency of 99.5% for RhB and 59% for p-chlorophenol has been obtained under natural sunlight within 45 min. Interestingly, the stability of Ag₂CO₃ is improved dramatically after making nanocomposite, and no decomposition of the catalyst was observed even after several photocatalytic cycles. Reactive oxygen species scavenging experiments with p-benzoquinone, isopropyl alcohol, and ammonium oxalate suggest that a major degradation process is caused by holes. Degradation of RhB into small organic moieties is detected using LC-MS technique. Further, the efficient mineralization of the degradation products occurs during the catalytic process.