微波水热合成Zn2GeO4纳米带及其光催化活性

采用微波水热法快速合成Zn₂GeO₄纳米带, 研究反应温度、模板剂、原料用量等因素对晶体生长的影响, 并优化其合成条件. 用场发射扫描电镜(FE-SEM)、X射线衍射(XRD)光谱和紫外-可见漫反射吸收光谱(UV-Vis RDS)等手段分析产物的形貌、结构和组成, 考察合成的Zn₂GeO₄在甲基橙光催化降解反应中的性能. 研究结果表明: 微波水热条件下, 以摩尔比为2:1的乙酸锌和氧化锗为原料, 在160℃反应20 min可合成分散均匀的Zn₂GeO₄纳米带, 宽约100 nm, 长为几十微米. 与常规水热法相比,微波水热法合成的Zn₂GeO₄纳米带的本征缺陷减少, 光致发光(PL) 光谱降低,比表面积增大50.7%,光催化活性提高54.7%.

Microwave-Hydrothermal Synthesis and Photocatalytic Activity of Zn2GeO4 Nanoribbons

Zn₂GeO₄ nanoribbons were synthesized via a microwave-hydrothermal method. The effects of reaction factors, such as reaction temperature, amount of reactants and template, were investigated and optimized for the formation of Zn₂GeO₄ nanoribbons. The products were characterized by various techniques including field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). Photocatalytic activities of the synthesized Zn₂GeO₄ nanostructures were evaluated for the degradation of aqueous methyl orange. Experimental results indicated that Zn₂GeO₄ nanoribbons can be synthesized from Zn(CH₃COO)₂ and GeO₂ (molar ratio 2: 1) under microwave irradiation at 160℃ for 20 min. The nanoribbons have uniformsizes with widths of 100 nm and are tens of micrometers in length. Compared with conventional hydrothermal methods, Zn₂GeO₄ nanoribbons from microwave-hydrothermal synthesis have less native defects, lower PL spectra, 50.7% larger specific surface area, and 54.7% higher photocatalytic activity.