Unsupported gold nanocones as sonocatalytic agents with enhanced catalytic properties.
Unsupported gold nanocones as sonocatalytic agents with enhanced catalytic properties.
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DOI：
10.1016/j.ultsonch.2021.105753
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发表时间：
2021-11
影响因子：
8.4
通讯作者：
Kwan JJ
中科院分区：
文献类型：
--
作者：
Su X;Jonnalagadda US;Bharatula LD;Kwan JJ
亚微米气体稳定金纳米锥 (gs-AuNC) 易于成核空化。空化激活 gs-AuNC 降解 4-硝基苯酚和亚甲蓝。 gs-AuNC 的降解动力学比类似尺寸的催化剂快 200 倍。催化剂位点的空化事件增强了亚微米 gs-AuNC 的功能。金催化剂因其在环境条件下实现可持续化学过程而引起人们的关注。这种反应活性归因于催化剂的小尺寸（<5 nm）；然而，它们的尺寸也给从产物流中去除时带来了困难，并且通常需要稀有金属添加剂来增强反应速率动力学，从而限制了这些催化剂的环境效益。相比之下，亚微米金催化剂更容易分离，但在环境条件下的反应性要低得多。在这项研究中，我们合成了亚微米气体稳定金纳米锥（gs-AuNC），它具有声学响应能力，比其他传统金催化剂具有更高的反应速率。我们探索了在 5.0 MPa 峰值负压和 1.1 MHz 中心频率下暴露于聚焦超声波的声响应 gs-AuNC 的催化性能。 gs-AuNC 成核的空化显着提高了水污染物的声催化降解效果，且无需助催化剂。通过调整催化剂的形态来控制空化，利用超声波放大催化作用，为超声波催化剂的未来设计开辟了新的途径，从而可以实现广泛的工业过程所需的可持续化学方法。
Submicron gas stabilising Au nanocones (gs-AuNCs) readily nucleate cavitation. Cavitation activates gs-AuNCs to degrade of 4-nitrophenol and methylene blue. Degradation kinetics with gs-AuNC are 200-fold faster than similarly sized catalysts. Cavitation events at catalyst sites enhanced functionality of submicron gs-AuNCs. Gold catalysts have attracted attention for enabling sustainable chemical processes under ambient conditions. This reactivity is attributed to the small size of the catalysts (<5 nm); however, their size also creates difficulty when removing from product streams and often require rare-metal additives to enhance reaction rate kinetics, thereby limiting the environmental benefits of these catalysts. Comparatively, submicron gold catalysts are easier to separate but are much less reactive under ambient conditions. In this study, we synthesized submicron gas-stabilising gold nanocones (gs-AuNCs) that are acoustically responsive to afford greater reaction rates than other conventional gold catalysts. We explore the catalytic performance of acoustically responsive gs-AuNCs exposed to focussed ultrasound at 5.0 MPa peak negative pressure and 1.1 MHz center frequency. Cavitation nucleated from gs-AuNCs significantly increased the sonocatalytic degradation of water pollutants without the need for co-catalysts. The ability to amplify catalysis with ultrasound by tailoring the morphology of the catalyst to control cavitation opens new paths for future designs of sonocatalysts that may enable a sustainable chemical approach needed for a broad range of industrial processes.
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影响因子：
22.1
作者：
Evangelista, Viridiana;Acosta, Brenda;Simakov, Andrey
通讯作者：
Simakov, Andrey
影响因子：
2.4
作者：
Chappell, Michael A.;Payne, Stephen J.
通讯作者：
Payne, Stephen J.
CeO2改性还原氧化石墨烯纳米片上锚定贵金属纳米粒子及其增强的催化性能
影响因子：
9.9
作者：
Ji, Zhenyuan;Shen, Xiaoping;Chen, Kangmin
通讯作者：
Chen, Kangmin
影响因子：
4.2
作者：
Midathana, Venkata Rao;Moholkar, Vijayanand S.
通讯作者：
Moholkar, Vijayanand S.
DOI：
10.1002/smll.201501322
发表时间：
2015-10-21
期刊：
Small (Weinheim an der Bergstrasse, Germany)
影响因子：
--
作者：
Kwan JJ;Myers R;Coviello CM;Graham SM;Shah AR;Stride E;Carlisle RC;Coussios CC
通讯作者：
Coussios CC