Fine‐Tuning Surface Properties of Perovskites via Nanocompositing with Inert Oxide toward Developing Superior Catalysts for Advanced Oxidation. (21st September 2018)

• Record Type: Journal Article
• Authors: Li, Jiang; Miao, Jie; Duan, Xiaoguang; Dai, Jie; Liu, Qiwei; Wang, Shaobin; Zhou, Wei; Shao, Zongping
• Is Part Of: Advanced functional materials. Volume 28:Number 44(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-09-21
• Subjects: advanced oxidation -- Fenton‐like reaction -- nanocompositing -- perovskite -- singlet oxygen; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201804654
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Cost‐effective, stable, and highly efficient heterogeneous catalyst is the key challenge for wastewater treatment based on Fenton‐like advanced oxidation processes. Perovskite oxides offer new opportunities because of their versatile compositions and flexible physiochemical properties. Herein, a new strategy is proposed that is different from the frequently used alien‐metal doping, to tune surface properties of perovskite oxides by nanocompositing perovskite with inert oxide, resulting in improved activity and stability for catalytic oxidation. By in situ modification of LaFeO3 with inert La2 O3 oxide through one‐pot synthesis, several important surface properties such as surface defects, H2 O2 adsorption capacity, Fe 2+ concentration, and charge‐transfer rate were improved, as well as resistance against iron leaching. In performance evaluation, among the various materials, La1.15 FeO3 (L1.15 FO) composite shows the highest Fenton activity (0.0402 min −1 ) for activating H2 O2 to oxidize methyl orange, 2.5 times that of the pristine LaFeO3 . Notably, in situ electron paramagnetic resonance analysis and radical scavenging tests unveil a faster generation of singlet oxygen as the dominant reactive species over L1.15 FO, consequently a novel non‐radical activation mechanism is proposed. Such improved performance is assigned to the strong coupling effect between the nanosized LaFeO3 and La2 O3 in the hybrids, which fine‐tune the surface properties of LaFeO3 perovskite as superior Fenton catalysts. Abstract : Fine‐tuning surface properties and structure of perovskites via nanocompositing with inert oxide toward developing superior catalysts for advanced oxidation.