Nanostructured Sonophotocatalysts for spatially controlled inertial cavitation towards energy‐efficient sonochemistry

Abstract

Catalytic nanomaterials have been demonstrated to enhance sonochemical processing through interactions with inertial cavitation events. Typically, sonochemistry generates inertial cavitation events directly from the solvent, which results in spatially uncontrolled cavitation events with limited interaction with the catalytic active site. These high intensity acoustic fields also result in thermal effects and side reactions, which may further influence chemical yields and selectivity. Herein, we report on ultrasound-responsive structured AuPd/TiO 2 open nanoshells (TONs) to surface-stabilize gas bubbles for promot-ing cavitation events in the vicinity of catalytic active site. These exogenous bubbles trapped on catalytic active sites readily cavitate to produce free radicals for chemical reactions. Our findings indicate a positive trend between cavitation and benzaldehyde production in the presence of our AuPd/TONs. In contrast, nanostructures without gas-stabilization demonstrate reduced sonochemical conversion, suggesting the catalytic potential of nanostructuring photocatalytic materials to function as both cavitation agents and photo-oxidative catalysts, or photocatalytic nanostructure (PCN).

Research Progress in Sonochemistry for Biomedical Applications★

“…其中的 AuPd 负责破坏表面的平整性和增加纳米颗粒的疏水性, 以增强其在水溶液中的气体捕获能力, 提高声空化效应 发生在该纳米颗粒表面的概率 [74] ; TiO 2 则作声光敏剂的 核心, 能被声空化气泡破裂产生的闪光所激活, 产生自 由基. 利用该声敏剂对苯甲醇的超声催化氧化实验表 明, 在合适条件下, TiO 2 的声催化效率最高能增加 1.5 倍 [75] .…”