Bi $_{25}$ FeO $_{40}$ - rGO纳米复合材料的光催化降解染料和产氢性能及机理研究
Enhanced photocatalytic dye degradation and hydrogen production ability of Bi$_{25}$FeO$_{40}$-rGO nanocomposite and mechanism insight
摘要：
比较了Bi $_{25}$ FeO $_{40}$ -还原氧化石墨烯（rGO）纳米复合材料和BiFeO $_{3}$ -rGO纳米复合材料对罗丹明B染料的光催化降解和水分解制氢的性能。适用于合成纳米复合材料的水热技术提供了在钙钛矿BiFeO $_{3}$和硅线石Bi $_{25}$ FeO $_{40}$之间的通用温度控制相选择。钙钛矿和硅线石结构的纳米复合材料都是稳定的，并且表现出比纯BiFeO $_{3}$纳米颗粒和市售Degussa P25二氧化钛高得多的光催化能力。值得注意的是，Bi $_{25}$ FeO $_{40}$ - rGO纳米复合材料在可见光照射下表现出比BiFeO $_{3}$ -rGO纳米复合材料优越的光催化能力和稳定性。对Bi $_{25}$ FeO $_{40}$ -rGO纳米复合材料的光催化性能进行了深入的探讨。
英文摘要：
A comprehensive comparison between Bi$_{25}$FeO$_{40}$-reduced graphene oxide(rGO) nanocomposite and BiFeO$_{3}$-rGO nanocomposite has been performed to investigate their photocatalytic abilities in degradation of Rhodamine B dye and generation of hydrogen by water-splitting. The hydrothermal technique adapted for synthesis of the nanocomposites provides a versatile temperature-controlled phase selection between perovskite BiFeO$_{3}$ and sillenite Bi$_{25}$FeO$_{40}$. Both perovskite and sillenite structured nanocomposites are stable and exhibit considerably higher photocatalytic ability over pure BiFeO$_{3}$ nanoparticles and commercially available Degussa P25 titania. Notably, Bi$_{25}$FeO$_{40}$- rGO nanocomposite has demonstrated superior photocatalytic ability and stability under visible light irradiation than that of BiFeO$_{3}$-rGO nanocomposite. The possible mechanism behind the superior photocatalytic performance of Bi$_{25}$FeO$_{40}$-rGO nanocomposite has been critically discussed.
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