Dien Nguyen Dac, Pham Thi Thu Ha, Vu Xuan Hoa, Xuan Vuong Truong, Nguyen Thi Thu Thuy, Trang Tran Thu, Van Hao Nguyen, Nga Pham Thi, Kim Chi Tran Thi, Giang Tran Thi Huong, Toan Nguyen Duc
Faculty of Occupational Safety and Health, Vietnam Trade Union University 169 Tay Son Street, Dong Da District Hanoi City Vietnam.
Faculty of Chemistry, TNU-University of Sciences Tan Thinh Ward Thai Nguyen City Vietnam.
RSC Adv. 2024 Sep 4;14(38):28244-28259. doi: 10.1039/d4ra04230a. eCollection 2024 Aug 29.
In this work, ZnO nanoplates and FeO nanospindles were successfully fabricated a simple hydrothermal method using inorganic salts as precursors. The ZnO/FeO hybrid was fabricated using a mechanical mixture of two different ZnO : FeO weight ratios to investigate the effect of weight ratio on catalytic properties. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that ZnO nanoplates (NPls) are about 20 nm thick with lateral dimensions of 100 × 200 nm, and FeO nanospindles (NSs) are about 500 nm long and 50 nm wide. X-ray diffraction (XRD) patterns revealed the successful formation of the ZnO, FeO, and ZnO/FeO samples and indicated that their crystallite sizes varied from 20 to 29 nm depending on the ZnO : FeO weight ratio. Ultraviolet-visible (UV-vis) spectra showed that the bandgap energies of ZnO and FeO were 3.15 eV and 2.1 eV, respectively. Energy dispersive X-ray spectroscopy (EDS) results revealed the successful combination of ZnO and FeO. Photocatalytic activity of the materials was evaluated through the degradation of methylene blue (MB) in aqueous solution under green light-emitting diode (GLED) irradiation. The results indicated that the ZnO/FeO composite showed a remarkable enhanced degradation capacity compared to bare ZnO NPls and FeO NSs. The ZnO : FeO = 3 : 2 sample demonstrated the best performance among all samples under identical conditions with a degradation efficiency of 99.3% for MB after 85 min. The optimum photocatalytic activity of the sample with ZnO : FeO = 3 : 2 was nearly 3.6% higher than that of the pure ZnO sample and 1.12 times more than that of the pristine FeO sample. Moreover, the highest photo-degradation was obtained at a photocatalyst dosage of 0.25 g l in dye solution.
在这项工作中，以无机盐为前驱体，通过一种简单的水热法成功制备了氧化锌纳米片和氧化亚铁纳米纺锤体。采用两种不同氧化锌与氧化亚铁重量比的机械混合物制备了氧化锌/氧化亚铁复合材料，以研究重量比对催化性能的影响。扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像显示，氧化锌纳米片（NPls）厚度约为20nm，横向尺寸为100×200nm，氧化亚铁纳米纺锤体（NSs）长度约为500nm，宽度为50nm。X射线衍射（XRD）图谱表明成功制备了氧化锌、氧化亚铁和氧化锌/氧化亚铁样品，并表明它们的微晶尺寸根据氧化锌与氧化亚铁的重量比在20至29nm之间变化。紫外可见（UV-vis）光谱表明，氧化锌和氧化亚铁的带隙能量分别为3.15eV和2.1eV。能量色散X射线光谱（EDS）结果表明氧化锌和氧化亚铁成功复合。通过在绿色发光二极管（GLED）照射下对水溶液中亚甲基蓝（MB）的降解来评估材料的光催化活性。结果表明，与裸露的氧化锌纳米片和氧化亚铁纳米纺锤体相比，氧化锌/氧化亚铁复合材料表现出显著增强的降解能力。在相同条件下，氧化锌与氧化亚铁=3:2的样品表现出最佳性能，85分钟后对亚甲基蓝的降解效率为99.3%。氧化锌与氧化亚铁=3:2的样品的最佳光催化活性比纯氧化锌样品高出近3.6%，是原始氧化亚铁样品的1.12倍。此外，在染料溶液中光催化剂用量为0.25g/L时获得了最高的光降解率。
