Channei Duangdao, Chansaenpak Kantapat, Phanichphant Sukon, Jannoey Panatda, Khanitchaidecha Wilawan, Nakaruk Auppatham
Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand.
Centre of Excellence for Innovation and Technology for Water Treatment, Naresuan University, Phitsanulok 65000, Thailand.
ACS Omega. 2021 Jul 22;6(30):19771-19777. doi: 10.1021/acsomega.1c02453. eCollection 2021 Aug 3.
WO/CeO heterostructured nanocomposites containing different WO ratios (0.1, 0.3, 0.5, and 1.0 wt %) were synthesized by a precipitation method. The coupling of CeO and WO with a high specific surface area noticeably enhanced the photocatalytic activity of indigo carmine (IC) degradation under visible-light irradiation. The degradation rate constants () of 0.5 wt % WO/CeO nanocomposites reached 4 and 5 times higher than those of CeO and WO, respectively. Regarding the experimental results, the X-ray diffraction (XRD) patterns of the CeO spherical nanoparticles and rod-shaped WO were assigned to the cubic fluorite and orthorhombic phase structures, respectively. The increasing photocatalytic activity of nanocomposite samples could be attributed to the heterojunction of the photocatalysts with efficient charge separation and strong oxidative ability, which were confirmed by the photoluminescence spectra and diffuse reflectance spectrometry. The staggered heterojunction of the nanocomposite promoted efficient electron transfer and suppressed the recombination of photogenerated electrons and holes during the process.
通过沉淀法合成了含有不同WO比例（0.1、0.3、0.5和1.0 wt%）的WO/CeO异质结构纳米复合材料。具有高比表面积的CeO和WO的耦合显著增强了在可见光照射下靛蓝胭脂红（IC）降解的光催化活性。0.5 wt%的WO/CeO纳米复合材料的降解速率常数（）分别比CeO和WO的降解速率常数高4倍和5倍。关于实验结果，CeO球形纳米颗粒和棒状WO的X射线衍射（XRD）图谱分别归属于立方萤石和正交相结构。纳米复合材料样品光催化活性的提高可归因于光催化剂的异质结具有有效的电荷分离和强氧化能力，这通过光致发光光谱和漫反射光谱得到了证实。纳米复合材料的交错异质结促进了有效的电子转移，并在该过程中抑制了光生电子和空穴的复合。
