Wang Jun, Gao Bo, Liu Dongliang, Cheng Lin, Zhang Yu, Lu Dingze, Yu Huawa, Chen Aimin, Yuan Shun, Chen Kaijia, Shang Shiguang
School of Science, Xi'an Polytechnic University, 19 Jinhua South Road, Xi'an 710048, China.
School of Science, Xi'an Jiaotong University, 28 Xianning Road, Xi'an 710049, China.
Nanomaterials (Basel). 2023 Jan 21;13(3):443. doi: 10.3390/nano13030443.
Supported nanostructured photocatalysis is considered to be a sustainable and promising method for water pollution photodegradation applications due to its fascinating features, including a high surface area, stability against aggregation, and easy handling and recovery. However, the preparation and morphological control of the supported nanostructured photocatalyst remains a challenge. Herein, a one-step hydrothermal method is proposed to fabricate the supported vertically aligned ZnO nanosheet arrays based on aluminum foil. The morphologically controlled growth of the supported ZnO nanosheet arrays on a large scale was achieved, and the effects of hydrothermal temperature on morphologic, structural, optical, and photocatalytic properties were observed. The results reveal that the surface area and thickness of the nanosheet increase simultaneously with the increase in the hydrothermal temperature. The increase in the surface area enhances the photocatalytic activity by providing more active sites, while the increase in the thickness reduces the charge transfer and thus decreases the photocatalytic activity. The influence competition between the area increasing and thickness increasing of the ZnO nanosheet results in the nonlinear dependence between photocatalytic activity and hydrothermal temperature. By optimizing the hydrothermal growth temperature, as fabricated and supported ZnO nanosheet arrays grown at 110 °C have struck a balance between the increase in surface area and thickness, it exhibits efficient photodegradation, facile fabrication, high recyclability, and improved durability. The RhB photodegradation efficiency of optimized and grown ZnO nanosheet arrays increased by more than four times that of the unoptimized structure. With 10 cm of as-fabricated ZnO nanosheet arrays, the degradation ratio of 10 mg/L MO, MB, OFL, and NOR was 85%, 51%, 58%, and 71% under UV irradiation (365 nm, 20 mW/cm) for 60 min. All the target pollutant solutions were almost completely degraded under UV irradiation for 180 min. This work offers a facile way for the fabrication and morphological control of the supported nanostructured photocatalyst with excellent photodegradation properties and has significant implications in the practical application of the supported nanostructured photocatalyst for water pollution photodegradation.
负载型纳米结构光催化因其具有高比表面积、抗团聚稳定性以及易于处理和回收等迷人特性，被认为是一种用于水污染光降解应用的可持续且有前景的方法。然而，负载型纳米结构光催化剂的制备及其形态控制仍然是一个挑战。在此，提出了一种一步水热法来制备基于铝箔的负载型垂直排列的ZnO纳米片阵列。实现了负载型ZnO纳米片阵列在大规模上的形态可控生长，并观察了水热温度对其形态、结构、光学和光催化性能的影响。结果表明，纳米片的表面积和厚度随水热温度的升高而同时增加。表面积的增加通过提供更多活性位点增强了光催化活性，而厚度的增加减少了电荷转移，从而降低了光催化活性。ZnO纳米片面积增加和厚度增加之间的影响竞争导致光催化活性与水热温度之间呈非线性关系。通过优化水热生长温度，在110℃下制备并负载生长的ZnO纳米片阵列在表面积增加和厚度增加之间取得了平衡，它表现出高效的光降解、简便的制备、高可回收性和提高的耐久性。优化生长的ZnO纳米片阵列对罗丹明B的光降解效率比未优化结构提高了四倍多。对于10厘米长的制备好的ZnO纳米片阵列，在紫外光（365纳米，20毫瓦/平方厘米）照射60分钟下，10毫克/升的甲基橙、亚甲基蓝、荧光素和诺氟沙星的降解率分别为85%、51%、58%和71%。在紫外光照射180分钟下，所有目标污染物溶液几乎完全降解。这项工作为制备具有优异光降解性能的负载型纳米结构光催化剂及其形态控制提供了一种简便方法，并且对负载型纳米结构光催化剂在水污染光降解的实际应用具有重要意义。
