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Low-frequency AC-photocatalysis coupling for high-efficiency removal of organic pollutants from water based on the self-powered triboelectric nanogenerator
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-07-06 , DOI: 10.1039/d3ta02569a Xinyu Hao 1, 2 , Tao Huang 1 , Ming Li 1 , Yating Pan 1 , Lei Liao 1 , Kaiyou Zhang 1 , Aimiao Qin 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-07-06 , DOI: 10.1039/d3ta02569a Xinyu Hao 1, 2 , Tao Huang 1 , Ming Li 1 , Yating Pan 1 , Lei Liao 1 , Kaiyou Zhang 1 , Aimiao Qin 1
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AC has long been considered unsuitable for photoelectrocatalysis (PEC) due to the electrochemical and thermal effects brought about by its high-frequency characteristics. However, the potential application values of low-frequency AC in PEC have rarely been explored. Herein, a PEC degradation system was designed and assembled by a rolling-freestanding triboelectric layer mode nanogenerator combined with TiO2 films. A nanogenerator was designed as low-frequency AC generator, and the TiO2 films with three nano nanostructures (nanosheets, nanobelts, and nanowire arrays) were prepared as photocatalysts. The device used an integrated design of a power generation system and catalytic system, equipped with fins that captures the external water-flow energy for operation, and simultaneously complex four process steps during operation: energy generation, PEC degradation, aeration, and stirring. The results indicate that the device can capture and transfer photoelectrons, which accelerate the generation of hydroxyl and superoxide radicals. The degradation capacities of the PEC degradation system for bisphenol A, tetracycline, and methylene blue are 1.7, 2.62, and 3.11 times, respectively, that of the TiO2 nanowire arrays as a single photocatalysis. After the three pollutants were alternately degraded in turn for 9 cycles for 54 h, the degradation efficiency of the system for the pollutants declined by only 0.7%, 1%, and 0.1%, respectively, verifying its excellent reusability and suitability for complex operating conditions. This work demonstrates substantial progress in the application of low-frequency AC and the integrated design of the PEC degradation system.
中文翻译：
基于自供电摩擦纳米发电机的低频交流光催化耦合高效去除水中有机污染物
由于其高频特性带来的电化学和热效应，交流电长期以来被认为不适合光电催化（PEC）。然而，低频交流电在 PEC 中的潜在应用价值却很少被探索。本文设计并组装了滚动式独立摩擦电层模式纳米发电机与TiO 2薄膜相结合的PEC降解系统。纳米发电机被设计为低频交流发电机，TiO 2制备了具有三种纳米结构（纳米片、纳米带和纳米线阵列）的薄膜作为光催化剂。该装置采用发电系统和催化系统一体化设计，配备翅片，捕获外部水流能量进行运行，运行过程中同时复杂的四个过程步骤：能量产生、PEC降解、曝气和搅拌。结果表明，该器件可以捕获和转移光电子，从而加速羟基和超氧自由基的产生。PEC降解体系对双酚A、四环素和亚甲基蓝的降解能力分别是TiO 2的1.7、2.62和3.11倍纳米线阵列作为单一光催化。三种污染物依次交替降解9次循环54 h后，系统对污染物的降解效率分别仅下降0.7%、1%和0.1%，验证了其优异的可重复使用性和复杂工况的适用性。这项工作展示了低频交流应用和PEC降解系统集成设计方面的实质性进展。
更新日期：2023-07-06
中文翻译：
基于自供电摩擦纳米发电机的低频交流光催化耦合高效去除水中有机污染物
由于其高频特性带来的电化学和热效应，交流电长期以来被认为不适合光电催化（PEC）。然而，低频交流电在 PEC 中的潜在应用价值却很少被探索。本文设计并组装了滚动式独立摩擦电层模式纳米发电机与TiO 2薄膜相结合的PEC降解系统。纳米发电机被设计为低频交流发电机，TiO 2制备了具有三种纳米结构（纳米片、纳米带和纳米线阵列）的薄膜作为光催化剂。该装置采用发电系统和催化系统一体化设计，配备翅片，捕获外部水流能量进行运行，运行过程中同时复杂的四个过程步骤：能量产生、PEC降解、曝气和搅拌。结果表明，该器件可以捕获和转移光电子，从而加速羟基和超氧自由基的产生。PEC降解体系对双酚A、四环素和亚甲基蓝的降解能力分别是TiO 2的1.7、2.62和3.11倍纳米线阵列作为单一光催化。三种污染物依次交替降解9次循环54 h后，系统对污染物的降解效率分别仅下降0.7%、1%和0.1%，验证了其优异的可重复使用性和复杂工况的适用性。这项工作展示了低频交流应用和PEC降解系统集成设计方面的实质性进展。
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