Fabrication of Ce3+ substituted nickel ferrite-reduced graphene oxide heterojunction with high photocatalytic activity under visible light irradiation.,Journal of Hazardous Materials

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Fabrication of Ce3+ substituted nickel ferrite-reduced graphene oxide heterojunction with high photocatalytic activity under visible light irradiation.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.jhazmat.2020.122593
Abdur Rahman ₁ , Muhammad Farooq Warsi ₁ , Imran Shakir ₂ , Muhammad Shahid ₁ , Sonia Zulfiqar ₃

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In the current investigation, graphene (rGO)-supported cerium substituted nickel ferrite (NiCeyFe2-yO4 y = 0.05) photocatalyst was prepared via two-step wet chemical approach. The resulting NiCeyFe2-yO4/rGO nanocomposite exhibited excellent photocatalytic performance and stability. Moreover, the photocatalytic activity of NiCeyFe2-yO4/rGO nanocomposite was also investigated comparatively with NiCeyFe2-yO4 nanoparticles. As compared to the NiCeyFe2-yO4 nanoparticles, NiCeyFe2-yO4/rGO nanocomposite showed superior photocatalytic efficiency and recycling stability for MB degradation, which is two times that of bare NiCeyFe2-yO4 nanoparticles. After visible light irradiation for 70 min, 94.67 % of MB dye was removed by NiCeyFe2-yO4/rGO nanocomposite whereas only 50 % of MB dye was removed by NiCeyFe2-yO4 nanoparticles. The increase in photocatalytic performance is mainly ascribed to formation of NiCeyFe2-yO4/rGO heterojunction which not only assist in separation of photo-induced charge carriers, but also sustain a strong redox ability. Moreover, the photo-corrosion of NiCe0.05Fe1.95O4 nanoparticles is inhibited through transfer of photo-induced electrons of NiCe0.05Fe1.95O4 nanoparticles to rGO. A possible photo-degradation mechanism based on reactive species trapping experiments has been proposed. The effect of various factors like pH, temperature and catalyst dosage has also been explored. Facile synthesis method, excellent photocatalytic performance for organic pollutants and superior reusability suggest that NiCeyFe2-yO4/rGO photocatalyst possesses high potential for large-scale pollutant treatment.

中文翻译：

Ce3 +取代镍铁氧体还原氧化石墨烯异质结的制备在可见光下具有较高的光催化活性。

在目前的研究中，石墨烯（rGO）负载的铈取代的镍铁氧体（NiCeyFe2-yO4 y = 0.05）光催化剂是通过两步湿化学法制备的。所得的NiCeyFe2-yO4 / rGO纳米复合材料表现出优异的光催化性能和稳定性。此外，还与NiCeyFe2-yO4纳米粒子比较研究了NiCeyFe2-yO4 / rGO纳米复合材料的光催化活性。与NiCeyFe2-yO4纳米颗粒相比，NiCeyFe2-yO4 / rGO纳米复合材料具有优异的光催化效率和MB降解的循环稳定性，是裸NiCeyFe2-yO4纳米颗粒的两倍。在可见光照射70分钟后，NiCeyFe2-yO4 / rGO纳米复合材料去除了94.67％的MB染料，而NiCeyFe2-yO4纳米颗粒仅去除了50％的MB染料。光催化性能的提高主要归因于NiCeyFe2-yO4 / rGO异质结的形成，它不仅有助于分离光诱导的载流子，而且还具有很强的氧化还原能力。此外，NiCe0.05Fe1.95O4纳米颗粒的光腐蚀通过将NiCe0.05Fe1.95O4纳米颗粒的光诱导电子转移到rGO来抑制。提出了一种基于反应性物种捕获实验的光降解机理。还探索了各种因素的影响，例如pH，温度和催化剂用量。简便的合成方法，对有机污染物的优异光催化性能和优异的可重复使用性表明，NiCeyFe2-yO4 / rGO光催化剂具有大规模处理污染物的潜力。

更新日期：2020-04-01

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