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Lorentz force promoted charge separation in a hierarchical, bandgap tuned, and charge reversible NixMn(0.5−x)O photocatalyst for sulfamethoxazole degradation
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2021-09-15 , DOI: 10.1016/j.apcatb.2021.120724
Hassan Anwer 1 , Jae-Woo Park 2
Affiliation  

Here, a hierarchical NixMn(0.5−x)O catalyst that propels charge carriers to opposite interfaces of core@shell nanoparticle is reported. The opposite drift of charge carriers was achieved by tuning band edges in a multilevel catalyst by varying the molar concentration (x, 0→0.5) of precursors in a series of input injections. Preferential oxidation by holes on the surface of the catalyst was confirmed with the oxidation state transformation of metal ions (platinum and lead) deposited on the catalyst from their respective solutions. To obtain an electron rich surface, the synthesis scheme was reversed (x, 0.5→0), which yielded a catalyst with an inverse geometry and directed electron flow towards the surface. The collective impact of the Lorentz force and internal charge carrier drift contributed to excellent recombination suppression and 98% sulfamethoxazole degradation in 30 min. Finally, structural integrity and catalytic potential of the composite after repeated magnetic separation and degradation cycles was assessed to establish its practical applicability.



中文翻译:

洛伦兹力在分级、带隙调节和电荷可逆的 NixMn(0.5-x)O 光催化剂中促进电荷分离,用于磺胺甲恶唑降解

这里,分层 Ni x Mn (0.5-x)据报道,O 催化剂将电荷载流子推进到核@壳纳米颗粒的相反界面。通过在一系列输入注入中改变前体的摩尔浓度 (x, 0 → 0.5) 来调整多级催化剂中的带边缘,从而实现电荷载流子的相反漂移。催化剂表面空穴的优先氧化通过从各自溶液沉积在催化剂上的金属离子(铂和铅)的氧化态转变得到证实。为了获得富电子表面,将合成方案颠倒 (x, 0.5→0),从而产生具有反向几何形状且将电子流导向表面的催化剂。洛伦兹力和内部电荷载流子漂移的共同影响有助于在 30 分钟内实现出色的重组抑制和 98% 磺胺甲恶唑降解。

更新日期:2021-09-23
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