In this article, the rational design of a physically coated TiO₂-WO₃ nanocube-polyaniline photocatalytic membrane (hierarchical) reactor for the efficient reduction of chromium (VI) under visible light is discussed. The incorporation of TiO₂-WO₃ in the polyaniline (PANI) membrane provides excellent hydrophilicity and high photo-corrosion resistance and facilitates the rapid permeation of water with a flux rate of 12 L/m² h and higher Cr (VI) reduction. The exposure of bare PANI membranes in Cr (VI) solution leads to over-oxidation of PANI membrane and eventually leads to the destruction of the membrane. The hierarchical photocatalytic coating improves the lifetime of the membrane by blocking it from deprotonation. The photocatalytic membrane could offer 79.30% Cr (VI) reduction under visible light irradiation in a photocatalytic membrane reactor. After several reduction cycles, the membrane showed good self-cleaning ability. The present work suggests that TiO₂-WO₃ nanocube-coated PANI hierarchical membrane is a promising approach for the reduction and removal of Cr (VI) from wastewater.

中文翻译：

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TiO2-WO3纳米立方-聚苯胺分级膜用于光催化膜反应器中高效除铬

本文讨论了物理涂覆的TiO ₂ -WO ₃纳米立方体-聚苯胺光催化膜（分层）反应器的合理设计，用于在可见光下有效还原铬（VI）。在聚苯胺(PANI)膜中掺入TiO ₂ -WO ₃提供了优异的亲水性和高耐光腐蚀性能，并有利于水的快速渗透，通量率为12 L/m 2 h，并具有更高的^Cr  (VI)还原率。裸露的PANI膜暴露在Cr(VI)溶液中会导致PANI膜过度氧化，最终导致膜的破坏。分级光催化涂层通过阻止膜的去质子化来提高膜的使用寿命。在光催化膜反应器中，该光催化膜在可见光照射下可将Cr(VI)还原率达到79.30%。经过多次还原循环后，膜表现出良好的自清洁能力。目前的工作表明，TiO ₂ -WO ₃纳米立方体涂覆的PANI分级膜是一种有前途的减少和去除废水中Cr (VI)的方法。