The prerequisite for the photocatalytic application is to develop an efficient and recyclable visible-light photocatalyst/photoelectrode. Herein, we designed and prepared TiO₂/Bi₂WO₆ nanostructured heterojunctions on carbon fibers (CFs) as an effective and weaveable visible-light photocatalyst/photoelectrode. With CFs as the substrate, TiO₂ nanorods (diameter: 200 nm and length: ∼2 μm) were prepared on their surface by a dip-coating hydrothermal method and then the in situ growth of Bi₂WO₆ nanosheets (diameter: 350–500 nm and thickness: ∼15 nm) was realized on the surface of TiO₂ nanorods by another hydrothermal treatment. When the CFs/TiO₂/Bi₂WO₆ bundles (length: ∼4 cm and weight: 0.15 g) were floated on polluted water, they could degrade 100% Rhodamine B (RhB) after 80 min, 100% Acid Orange 7 (AO7) after 60 min, 95.1% tetracycline hydrochloride (TTCH) after 60 min, and 90.5% 4-chlorophenol (4-CP) after 150 min of visible-light irradiation (λ > 400 nm), which is higher than those degraded by pure CFs or CFs/TiO₂ heterojunctions. Moreover, the CFs/TiO₂/Bi₂WO₆ bundles can be further weaved into a cloth (area: 4 × 4 cm²). Such CFs/TiO₂/Bi₂WO₆ cloth as a working electrode exhibited significant photocurrent, which can be enhanced by elevating the applied voltage bias. Furthermore, 100% RhB can be degraded by the CFs/TiO₂/Bi₂WO₆ cloth in 80 min via a photoelectrocatalytic process (bias: 0.5 V vs. SCE), which is higher than that from the photocatalysis (90.1% RhB) or the electrocatalysis (21% RhB) process alone. In particular, a macroscale CFs/TiO₂/Bi₂WO₆ cloth can be easily recycled with good stability. Therefore, the CFs/TiO₂/Bi₂WO₆ cloth can be used as an efficient and recyclable visible-light photocatalyst/photoelectrode with a great potential in the practical applications for purifying wastewater in the river and/or lake.

中文翻译：

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在碳纤维上 制备TiO ₂ / Bi ₂ WO ₆纳米结构异质结，作为可编织的可见光光催化剂/光电极†

光催化应用的先决条件是开发有效且可回收的可见光光催化剂/光电极。本文中，我们设计并制备了碳纤维（CFs）上的TiO ₂ / Bi ₂ WO ₆纳米结构异质结，作为一种有效的可编织可见光光催化剂/光电极。以CFs为基材，通过浸涂水热法在其表面制备TiO ₂纳米棒（直径：200 nm，长度：〜2μm），然后原位生长Bi ₂ WO ₆纳米片（直径：350–在TiO ₂的表面上实现了500 nm和厚度：约15 nm）纳米棒通过另一种水热处理。当CFs / TiO ₂ / Bi ₂ WO ₆束（长度：〜4 cm，重量：0.15 g）漂浮在污水上时，它们可以在80分钟后降解100％罗丹明B（RhB），100％酸性橙7（ 60分钟后的AO7），60分钟后的95.1％的四环素盐酸盐（TTCH）和150分钟的可见光（λ > 400 nm）后的90.5％4-氯苯酚（4-CP ），比经降解的AO7高。纯CFs或CFs / TiO ₂异质结。此外，可以将CFs / TiO ₂ / Bi ₂ WO ₆束进一步编织成一块布（面积：4×4 cm ²）。此类CFs / TiO ₂ / Bi ₂WO ₆布作为工作电极表现出显着的光电流，可以通过提高施加的偏压来增强光电流。此外，CFs / TiO ₂ / Bi ₂ WO ₆布可以在80分钟内通过光电催化过程（偏压：0.5 V vs. SCE）降解100％RhB ，高于光催化过程（90.1％RhB）。或单独使用电催化（21％RhB）工艺。特别地，大尺寸CFs / TiO ₂ / Bi ₂ WO ₆布可以容易地以良好的稳定性回收。因此，CFs / TiO ₂ / Bi ₂ WO ₆ 布可以用作有效且可回收的可见光光催化剂/光电极，在净化河流和/或湖泊中的废水的实际应用中具有很大的潜力。