Plasmonic Bi metal as cocatalyst and photocatalyst: The case of Bi/(BiO)₂CO₃ and Bi particles

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• 作者：Yanjuan Sun^a ; Zaiwang Zhao^a ; Wendong Zhang^b ; Chunfeng Gao^a ; Yuxin Zhang^c ; Fan Dong^a ; ^{dfctbu@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Plasmonic Bi metal ; SPR effect ; (BiO)2CO3 microspheres ; Photocatalysis ; NO purification
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：485
• 期：Complete
• 页码：1-10
• 全文大小：5376 K

文摘

Semimetal bismuth with plasmonic properties has triggered increased interests. In this work, a facile strategy was developed to synthesize the Bi/(BiO)₂CO₃ (Bi-BOC) nanocomposites and Bi elemental photocatalysts. The Bi nanoparticles were produced via the insitu reduction of (BiO)₂CO₃ by NaBH₄. The catalysts were utilized for the photocatalytic NO removal under visible light and UV illumination. Significantly, the photocatalytic capability of the Bi-BOC was highly enhanced with an unprecedented NO removal of 63.6%. The Bi metal demonstrated a direct plasmonic photocatalytic NO removal ratio of 53.6% under UV irradiation. The significantly enhanced photocatalytic capability of Bi-BOC can be ascribed to the synergistic effects of the SPR effect, enhanced visible-light-harvesting and the efficient electron–hole separation induced by Bi nanoparticles. The Bi nanoparticles can perform as a non-noble metal-based plasmonic cocatalyst for advancing photocatalytic ability. The mechanism of photocatalytic NO oxidation was proposed and compared under both visible light and UV illumination. Furthermore, the Bi-BOC photocatalysts showed good photochemical stability under repeated tests. This work could not only offer new insights into in-situ fine-tune reduction strategy for Bi-based photocatalysts, but also proves the potentials of utilizing low cost Bi cocatalysts as a substitute for noble metals to improve other photocatalysts.