Tahmasebi N, Madmoli S
Department of Science, Jundi-Shapur University of Technology Dezful Iran
RSC Adv. 2018 Feb 12;8(13):7014-7021. doi: 10.1039/c7ra12355h. eCollection 2018 Feb 9.
In this work, a WO /Cs WO heterostructured composite was synthesized a simple pyrolysis method followed by heat treatment under a reducing atmosphere. Optical absorption results revealed the WO /Cs WO heterostructured composite exhibits a strong absorption tail in the Vis and NIR regions which could have important implications for its photoactivity. The photocatalytic performance of synthesized samples with different Cs/W molar ratios was evaluated by the photodegradation of RhB in aqueous solution under simulated solar light irradiation. The results revealed that the photocatalytic activity of the WO /Cs WO composite is much higher than those of pure tungsten bronze (Cs WO, = 0.32, and 0.5) and pure WO samples, where 90% RhB was degraded after 160 min irradiation. Also, the WO /Cs WO composite exhibits excellent photocatalytic activity for the degradation of MO, MB, RhB, and MG aqueous solution under visible light irradiation. It is proposed that the higher photocatalytic activity of the WO /Cs WO composite could be attributed to the greater surface adsorption of dye molecules, intense light absorption in the visible and NIR regions, and photogenerated electron-hole separation.
在本工作中，采用简单的热解方法，随后在还原气氛下进行热处理，合成了WO₃/CsₓWO₃异质结构复合材料。光吸收结果表明，WO₃/CsₓWO₃异质结构复合材料在可见光和近红外区域呈现出强烈的吸收尾，这可能对其光活性具有重要意义。通过在模拟太阳光照射下对水溶液中的罗丹明B进行光降解，评估了不同Cs/W摩尔比的合成样品的光催化性能。结果表明，WO₃/CsₓWO₃复合材料的光催化活性远高于纯钨青铜（CsₓWO₃，x = 0.32和0.5）和纯WO₃样品，在照射160分钟后，90%的罗丹明B被降解。此外，WO₃/CsₓWO₃复合材料在可见光照射下对甲基橙、亚甲基蓝、罗丹明B和甲基绿水溶液的降解表现出优异的光催化活性。有人提出，WO₃/CsₓWO₃复合材料较高的光催化活性可归因于染料分子更大的表面吸附、在可见光和近红外区域的强烈光吸收以及光生电子-空穴分离。
