Composites of refluxed carbon nanotubes (CNTs) at different contents and orthorhombic tungsten oxide hydrate (WO₃∙H₂O) were prepared via acid precipitation at room temperature. The CNTs produced a new phase of monoclinic tungsten oxide dihydrate WO₃∙2H₂O, caused the breakage of WO₃∙H₂O nanoplates, and affected the microstrain in the nanocomposites. The CNTs also enhanced the absorbance in the visible range and increased the specific surface area and pore volume but abnormally enlarged the optical bandgap, which was assigned to the emerging monoclinic WO₃∙2H₂O phase. The adsorptivity and photocatalytic activity of the nanocomposites increased remarkably with CNT content. H₂O₂ strongly enhanced the photocatalytic activity of the pristine and nanocomposite samples, implying the vital role of photogenerated electrons in the photocatalytic process. Among the synthesized samples, the sample with 20 wt.% CNTs showed the highest adsorptivity and photocatalytic efficiency under visible light irradiation. It also exhibited good reusability in methylene blue degradation and applicability in degrading different organic dyes. This study presents a simple method to prepare CNT@WO₃∙H₂O nanocomposites with a large surface area, a high adsorptivity, and a high photocatalytic activity under visible light irradiation.

在室温下通过酸沉淀制备了不同含量的回流碳纳米管（CNT）和正交氧化钨水合物（WO ₃ ∙H ₂ O）的复合材料。碳纳米管产生了新相的单斜氧化钨二水合物WO ₃ ∙2H ₂ O，导致WO ₃ ∙H ₂ O纳米片断裂，影响纳米复合材料的微应变。碳纳米管还增强了可见光范围内的吸光度，增加了比表面积和孔体积，但异常扩大了光学带隙，这归因于新兴的单斜晶 WO ₃ ∙2H ₂O相。纳米复合材料的吸附能力和光催化活性随着碳纳米管含量的增加而显着增加。H ₂ O ₂极大地增强了原始和纳米复合材料样品的光催化活性，表明光生电子在光催化过程中的重要作用。在合成的样品中，含有 20 wt.% CNTs 的样品在可见光照射下表现出最高的吸附性和光催化效率。它还在亚甲蓝降解中表现出良好的可重复使用性和在降解不同有机染料中的适用性。本研究提出了一种制备 CNT@WO ₃ ∙H ₂的简单方法O纳米复合材料具有大表面积、高吸附性和可见光照射下的高光催化活性。