Fig.S4.The photocatalytic degradation curves from The three-dimensional flower-like Bi2WO6 assisted by ethanolamine through microwave method for efficient photocatalytic activity

The three-dimensional flower-like Bi2WO6 was synthesized through one-step microwave method (the reaction temperature was 434 K and the reaction took 10 min), with the assist of ethanol amine. The prepared samples were characterized by X-ray diffraction, scanning electron microscope, Fourier-transform infrared spectroscopy, ultraviolet–visible spectroscopy, PL, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller analysis. Methyl orange was used as target pollutant to evaluate the photocatalysis property of samples. Furthermore, the influence mechanism of ethanolamine on the structure and catalytic performance of Bi2WO6 was discussed. The detailed characterizations revealed that the 3D flower-like Bi2WO6 was successfully synthesized with the assist of ethanol amine. The results confirmed that the ethanolamine significantly influenced the morphology of Bi2WO6 products. The addition of ethanolamine can effectively alter the pressure of the reaction and improve the crystal phase and structure of Bi2WO6 photocatalysts, enhancing the photocatalytic activity of samples and improving the photocatalytic efficiency. EA can serve as assembling agents and structure-directing agents and result in the formation of flowerlike architectures. With the increase of the amount of EA, the as-prepared Bi2WO6 sample gradually forms flower-like structure, leading to a shorter time of light holes migrating to the surface of the catalyst. It makes the compound rate significantly decreased, and improves the photocatalytic efficiency of the sample.本研究以乙醇胺（ethanolamine）为助剂，采用一步微波法（反应温度434 K，反应时长10 min）合成了三维花状钨酸铋（Bi2WO6）。采用X射线衍射（X-ray diffraction）、扫描电子显微镜（scanning electron microscope）、傅里叶变换红外光谱（Fourier-transform infrared spectroscopy）、紫外-可见光谱（ultraviolet–visible spectroscopy）、光致发光光谱（PL）、X射线光电子能谱（X-ray photoelectron spectroscopy）以及布鲁诺尔-埃米特-特勒比表面积分析（Brunauer–Emmett–Teller analysis）对所制备样品进行了表征。以甲基橙（methyl orange）为目标污染物，评估所得样品的光催化性能。此外，本文还探讨了乙醇胺对Bi2WO6结构与催化性能的影响机制。详细的表征结果证实，通过乙醇胺辅助可成功制备出三维花状Bi2WO6。实验结果表明，乙醇胺可显著调控Bi2WO6产物的形貌。乙醇胺的添加可有效调节反应体系压力，优化Bi2WO6光催化剂的晶相与结构，进而提升样品的光催化活性与催化效率。乙醇胺可作为组装剂与结构导向剂，促使花状结构的形成。随着乙醇胺添加量的增加，所制备的Bi2WO6样品逐渐形成花状结构，使得光生空穴迁移至催化剂表面的时间缩短，显著降低了载流子复合速率，最终提升了样品的光催化效率。