Sheet-like and truncated-dodecahedron-like AgI structures via a surfactant-assisted protocol and their morphology-dependent photocatalytic performance.
Sheet-like and truncated-dodecahedron-like AgI structures via a surfactant-assisted protocol and their morphology-dependent photocatalytic performance.
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DOI：
10.1039/c6cp06948g
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Dan Xiao;Dan Xiao;Guangwei Geng;Guangwei Geng;Penglei Chen;Penglei Chen;Tiesheng Li;Minghua Liu
中科院分区：
文献类型：
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作者：
Dan Xiao;Dan Xiao;Guangwei Geng;Guangwei Geng;Penglei Chen;Penglei Chen;Tiesheng Li;Minghua Liu
卤化银基结构作为有效的可见光驱动的光降解有机污染物的光催化剂引起了人们的极大兴趣，并且那些关注其形态依赖性催化性能的研究受到了特别关注。虽然过去几年中AgCl和AgBr基光催化剂在这方面取得了巨大进步，但有关AgI基物质的相关探索相对较少，尽管AgI基结构优异的耐久性使其成为潜在光催化用途的有吸引力的候选者。通过AgNO3和四甲基碘化铵（TMAI）、AgNO3和四丁基碘化铵（TBAI）之间的化学反应，我们报告了可以通过表面活性剂辅助制造方案可控地合成分别具有片状和截断十二面体形态的AgI结构。在我们的合成系统中，AgNO3 作为银源，而 TMAI 和 TBAI 表面活性剂不仅作为碘源，而且还作为可控制造的指导试剂。事实证明，我们的 AgI 结构可以作为可见光激发的光催化剂，用于甲基橙的光降解。我们发现，与片状结构相比，截断十二面体的 AgI 结构表现出显着增强的催化性能。此外，我们还公开了我们的截短十二面体类AgI基物质可以表现出优异的光催化稳定性，其中即使在连续重复光反应22次之后，它们的催化反应活性在可见光照射下也仅表现出微小的波动。我们的工作不仅可能为 AgI 结构的可控合成引入一种简便的方案，而且还为通过形态改变轻松增强其催化性能铺平了道路。
Silver halide-based structures have been attracting great interest as efficient visible-light-driven photocatalysts towards the photodegradation of organic pollutants, and those studies focusing on their morphology-dependent catalytic performances have received particular attention. While great advancements in this regard have been witnessed in the past few years with respect to AgCl- and AgBr-based photocatalysts, relevant explorations concerning AgI-based species are relatively rare, even though the excellent durability of AgI-based structures renders them attractive candidates for potential photocatalytic uses. By means of chemical reactions between AgNO3 and tetramethylammonium iodide (TMAI), and AgNO3 and tetrabutylammonium iodide (TBAI), we herein report that AgI structures with a sheet-like and a truncated-dodecahedron-like morphology, respectively, could be controllably synthesized via a surfactant-assisted fabrication protocol. In our synthesis systems, AgNO3 works as the silver source, while the TMAI and TBAI surfactants serve not only as an iodine source but also as a directing reagent for controllable fabrication. It has been demonstrated that our AgI structures could work as visible-light-energized photocatalysts towards the photodegradation of methyl orange. We find that compared to their sheet-like counterparts, the truncated-dodecahedron-like AgI architectures exhibit substantially boosted catalytic performances. Moreover, we disclose that our truncated-dodecahedron-like AgI-based species could display excellent photocatalytic stability, wherein their catalytic reactivity displays only trivial fluctuations under visible-light irradiation even after the photoreactions have been repeated 22 times continuously. Our work might not only introduce a facile protocol for the controllable synthesis of AgI structures but also pave an avenue for facile enhancement of their catalytic performances via morphology alterations.