Abstract Z-scheme reduced graphene oxide (rGO)/TiO2-bronze (TiO2-B)/W18O49 photocatalyst consisted of rGO, super-thin TiO2-B nanosheets, and W18O49 nanofibers was fabricated by a two-step solvothermal synthesis route. The TiO2-B nanosheets were tightly attached on rGO firstly. W18O49 nanowires were then grown on rGO/TiO2-B. Precursors and reaction conditions play important roles for getting the optimal microstructure. The ternary photocatalyst is able to absorb sunlight ranging from ultraviolet to near infrared regions, which makes full use of light for efficiently photocatalytic degrading organic pollutants. The light absorption intensity and photon-generated carrier transfer efficiency are both improved with adding rGO. The localized surface plasmon resonance effect arose from the nonstoichiometric W18O49 is in favour of the absorption range of the rGO/TiO2-B/W18O49 composite broadening to near infrared light range. The photocatalytic mechanism of Z-scheme rGO/TiO2-B/W18O49 composite was verified by an electron spin resonance test. The conduction band of TiO2-B and the valence band of W18O49 are used in the photocatalytic degradation of rhodamine B, facilitating the efficient separation of photogenerated carriers. The rGO/TiO2-B/W18O49 heterostructure exhibits an excellent photocatalytic performance under full solar-spectrum irradiation. The result may represent a new strategy for the construction of nanocomposites with suitable band structure in the efficient application of full solar light.

中文翻译：

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Z-scheme还原氧化石墨烯/TiO 2 -Bronze/W 18 O 49 三元异质结构，实现高效的全太阳光谱光催化

摘要 Z 型还原氧化石墨烯 (rGO)/TiO2-青铜 (TiO2-B)/W18O49 光催化剂由 rGO、超薄 TiO2-B 纳米片和 W18O49 纳米纤维组成，采用两步溶剂热合成路线。TiO2-B 纳米片首先紧密附着在 rGO 上。然后在 rGO/TiO2-B 上生长 W18O49 纳米线。前体和反应条件对于获得最佳微观结构起着重要作用。三元光催化剂能够吸收从紫外到近红外区域的太阳光，充分利用光来高效光催化降解有机污染物。添加 rGO 后，光吸收强度和光生载流子转移效率均得到提高。由非化学计量的 W18O49 引起的局域表面等离子体共振效应有利于 rGO/TiO2-B/W18O49 复合材料的吸收范围扩大到近红外光范围。Z-scheme rGO/TiO2-B/W18O49复合材料的光催化机理通过电子自旋共振测试得到验证。TiO2-B的导带和W18O49的价带用于光催化降解罗丹明B，促进光生载流子的有效分离。rGO/TiO2-B/W18O49异质结构在全太阳光谱照射下表现出优异的光催化性能。该结果可能代表了一种在全太阳光的有效应用中构建具有合适能带结构的纳米复合材料的新策略。Z-scheme rGO/TiO2-B/W18O49复合材料的光催化机理通过电子自旋共振测试得到验证。TiO2-B的导带和W18O49的价带用于光催化降解罗丹明B，促进光生载流子的有效分离。rGO/TiO2-B/W18O49异质结构在全太阳光谱照射下表现出优异的光催化性能。该结果可能代表了一种在全太阳光的有效应用中构建具有合适能带结构的纳米复合材料的新策略。Z-scheme rGO/TiO2-B/W18O49复合材料的光催化机理通过电子自旋共振测试得到验证。TiO2-B的导带和W18O49的价带用于光催化降解罗丹明B，促进光生载流子的有效分离。rGO/TiO2-B/W18O49异质结构在全太阳光谱照射下表现出优异的光催化性能。该结果可能代表了一种在全太阳光的有效应用中构建具有合适能带结构的纳米复合材料的新策略。促进光生载流子的有效分离。rGO/TiO2-B/W18O49异质结构在全太阳光谱照射下表现出优异的光催化性能。该结果可能代表了一种在全太阳光的有效应用中构建具有合适能带结构的纳米复合材料的新策略。促进光生载流子的有效分离。rGO/TiO2-B/W18O49异质结构在全太阳光谱照射下表现出优异的光催化性能。该结果可能代表了一种在全太阳光的有效应用中构建具有合适能带结构的纳米复合材料的新策略。