Effect of rare earth doping on the structural, magnetic and photocatalytic properties of newly synthesized nanocrystalline rare earth doped Ruddlesden–Popper oxides LnSrFe_0.5Co_0.5O₄ (Ln = La, Nd, Sm, Gd)

Abstract

The Ruddlesden-Popper (RP) oxides in a high grade of purity are generally prepared at high temperature and that is why there are few reports on their nanocrystalline state. These oxides...

Switching from antiferromagnetism to ferromagnetism in nanocrystalline La1−xSr1+xCoO4 (x = 0.0, 0.2, 0.4 and 0.6) layered perovskite oxides: effects of mixed valence states of Co on their magnetic, optical and photocatalytic properties

“…In the Fenton-like process, the active Co 3+ /Co 4+ ions existing in the photocatalyst may interact with the oxidant H 2 O 2 and be reduced to Co 2+ , which yields a highly reactive OH˙ oxidizing agent that is accountable for the degradation of the RhB contaminant, as explained in eqn (15)–(19). 26,46…”

“…This unexpected outcome can be attributed to the reaction between H 2 O 2 and OH˙ radicals, which leads to the production of OOH˙ radicals, i.e. , H 2 O 2 scavenges active OH˙ radicals, as shown in eqn (12) and (13) 26 OH˙ + H 2 O 2 → H 2 O + HOO˙OH˙ + HOO˙ → H 2 O + O 2 Hence, 2 mL of H 2 O 2 was typically used in the subsequent reactions.…”

“…25 The results of magnetic measurement of nanocrystalline monolayered LnSrFe 0.5 Co 0.5 O 4 (where Ln = La, Nd, Sm, and Gd) phases indicate the presence of weak ferromagnetic behaviour along with predominant antiferromagnetic interactions. 26…”

Recent advances in semiconductor heterojunctions: a detailed review of the fundamentals of photocatalysis, charge transfer mechanism and materials

“…These factors have led to an increased awareness and, thereby, further exploration of possible approaches toward environmental remediation. 1–3…”