Design and fabrication of polyaniline/Bi2MoO6 nanocomposites for enhanced visible-light-driven photocatalysis
Design and fabrication of polyaniline/Bi2MoO6 nanocomposites for enhanced visible-light-driven photocatalysis
复制标题
用于增强可见光驱动光催化的聚苯胺/Bi2MoO6纳米复合材料的设计和制造
DOI：
10.1039/c9nj01651a
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发表时间：
2019
影响因子：
3.3
通讯作者：
Bing Sun
中科院分区：
文献类型：
--
作者：
Tiantian Feng;Hao Yin;Hao Jiang;Xin Chai;Xinle Li;Deyang Li;Jing Wu;Xuanhe Liu;Bing Sun
通过 PANI 在 Bi2MoO6 纳米片表面的原位聚合作为强大的光催化剂，开发了聚苯胺/Bi2MoO6 (PANIx/Bi2MoO6) 纳米复合材料的简便合成，用于可见光驱动的罗丹明 B (RhB) 降解。分子PANI层覆盖由超薄纳米片（13.8±1.6 nm）组成的花状Bi2MoO6微球的表面，并且对Bi2MoO6的固有结晶度没有影响。 PANI/Bi2MoO6 表现出增强的可见光吸光度、改善的光电化学性能以及显着提高的 RhB 降解光催化效率。 Bi2MoO6 和 PANI 良好匹配的能带结构与分子 PANI 层的协同效应，具有出色的空穴传输和可接近的活性位点，有助于提高光生电荷载流子的分离效率和去除 RhB 的光催化活性。机理研究表明，光致空穴和超氧自由基在增强光催化性能方面发挥着重要作用。在 PANI0.5/Bi2MoO6 的情况下，RhB 的优化光降解率在 120 分钟内高达~100%，这揭示了具有 0.0335 min−1 的高表观速率常数和可接受的回收稳定性的一级动力学。这项工作揭示了具有优异光催化活性的Bi2MoO6基光催化剂在环境修复中的应用。
The facile synthesis of polyaniline/Bi2MoO6 (PANIx/Bi2MoO6) nanocomposites for visible-light-driven degradation of rhodamine B (RhB) was developed via in situ polymerization of PANI on the surface of Bi2MoO6 nanosheets as robust photocatalysts. The molecular PANI layers covered the surface of flower-like Bi2MoO6 microspheres consisting of ultrathin nanosheets (13.8 ± 1.6 nm) and exerted no impact on the intrinsic crystallinity of Bi2MoO6. The PANI/Bi2MoO6 exhibited enhanced visible light absorbance, improved photoelectrochemical performance and remarkably increased photocatalytic efficiency in the degradation of RhB. The synergistic effect of the well-matched band structures of Bi2MoO6 and PANI coupled with the molecular PANI layers for excellent hole transfer and accessible active sites contributed to the enhanced separation efficiency of photogenerated charge carriers and the boosted photocatalytic activity for RhB removal. Mechanism studies indicated that the photoinduced holes and superoxide radicals played essential roles in the enhanced photocatalytic performance. The optimized photodegradation rate for RhB was up to ∼100% during 120 min in the case of PANI0.5/Bi2MoO6, which revealed the first-order kinetics with a high apparent rate constant of 0.0335 min−1 and acceptable recycling stability. This work sheds light on the application of Bi2MoO6-based photocatalysts with superior photocatalytic activity in environmental remediation.