Increasing organic pollutants have seriously affected the ecological environment and human health, photocatalytic technology is considered as one of the most effective and environmentally friendly treatment methods. In this work, a novel hierarchical polyurethane (PU)/reduced graphene oxide (RGO)/bismuth oxyiodide (BiOI) composite fiber photocatalyst is constructed via an energy-saving route consisted of ultrasonic-assisted and co-precipitation method by utilizing PU nanofibers as substrate. The RGO are first evenly wrapped in the PU nanofiber surface and BiOI nanosheets are then uniformly grown on the PU/RGO surface to form the hierarchical PU/RGO/BiOI composite fibers with a core–shell structure. The composition, morphology and electrochemical performance of the obtained PU/RGO/BiOI were characterized by XRD, XPS, SEM, BET, I-t and EIS. Benefited from the high specific surface area of the PU nanofiber and the excellent electron transfer ability of the RGO, a remarkable photocatalytic activity was achieved for the PU/RGO/BiOI composite fibers and the degradation rate of RhB is 93.2% within 180 min. Notably, compared to the traditional suspended nanoparticles, the PU/RGO/BiOI fibers exhibit excellent flexibility and self-supporting property, and can be easily separated and recovered from the contaminated water. Thus, the obtained PU/RGO/BiOI composite fibers with high photocatalytic activity and easily separable property are expected to possess great potential in water purification.

日益增加的有机污染物严重影响了生态环境和人类健康，光催化技术被认为是最有效、最环保的处理方法之一。在这项工作中，以聚氨酯纳米纤维为原料，采用超声辅助和共沉淀法的节能路线，构建了一种新型的分层聚氨酯（PU）/还原氧化石墨烯（RGO）/碘化铋（BiOI）复合纤维光催化剂。基质。首先将RGO均匀包裹在PU纳米纤维表面，然后在PU/RGO表面均匀生长BiOI纳米片，形成具有核壳结构的分级PU/RGO/BiOI复合纤维。采用XRD、XPS、SEM、BET、It和EIS对所得PU/RGO/BiOI的组成、形貌和电化学性能进行了表征。得益于PU纳米纤维的高比表面积和RGO优异的电子转移能力，PU/RGO/BiOI复合纤维具有显着的光催化活性，180 min内RhB的降解率为93.2%。值得注意的是，与传统的悬浮纳米粒子相比，PU/RGO/BiOI纤维具有优异的柔韧性和自支撑性，并且可以很容易地从污染水中分离和回收。因此，所获得的具有高光催化活性和易分离性能的PU/RGO/BiOI复合纤维有望在水净化方面具有巨大的潜力。PU/RGO/BiOI复合纤维具有显着的光催化活性，180 min内RhB的降解率为93.2%。值得注意的是，与传统的悬浮纳米粒子相比，PU/RGO/BiOI纤维具有优异的柔韧性和自支撑性，并且可以很容易地从污染水中分离和回收。因此，所获得的具有高光催化活性和易分离性能的PU/RGO/BiOI复合纤维有望在水净化方面具有巨大的潜力。PU/RGO/BiOI复合纤维具有显着的光催化活性，180 min内RhB的降解率为93.2%。值得注意的是，与传统的悬浮纳米粒子相比，PU/RGO/BiOI纤维具有优异的柔韧性和自支撑性，并且可以很容易地从污染水中分离和回收。因此，所获得的具有高光催化活性和易分离性能的PU/RGO/BiOI复合纤维有望在水净化方面具有巨大的潜力。