A novel three-dimension separable and recyclable rGH-PANI/BiOI photocatalyst with the synergism of adsorption-enrichment and photocatalytic-degradation was successfully prepared via a facile three-step hydrothermal method. The three-dimension reduced graphene oxide hydrogel (rGH) in with flower-like BiOI photocatalyst uniformly distributed not only possesses excellent adsorption and electron transport properties, but also is easy to be separated from water for recycling. In addition, polyphenylamine (PANI) provides superior hole transport ability due to its delocalized π-π conjugate structure. The cooperation of rGH and PANI greatly enhances the separation efficiency of photogenerated carriers, and finally improves the photocatalytic degradation behaviors. The removal rates of Rhodamine B (RhB) by rGH-PANI/BiOI-70 % composite under visible light respectively reach 100 % and 50.13 % in static and dynamic systems, which are 12.85 and 3.58 times of BiOI, respectively. The removal rate does not show decrease after 5 recycles indicating the excellent separable and recyclable property of rGH-PANI/BiOI photocatalyst. The work provides an essential reference for designing and constructing hydrogel-based ternary composite photocatalysts with excellent synergism of adsorption and photocatalysis, which shows great potential in the treatment of water pollution.

通过简便的三步水热法成功地制备了具有吸附富集和光催化降解协同作用的新型可分离，可循环利用的rGH-PANI / BiOI三维光催化剂。花朵状BiOI光催化剂均匀分布的三维还原氧化石墨烯水凝胶（rGH）不仅具有优异的吸附和电子传输性能，而且易于与水分离以便回收利用。另外，聚苯胺（PANI）由于其离域化的π-π共轭结构而具有出色的空穴传输能力。rGH和PANI的合作极大地提高了光生载流子的分离效率，并最终改善了光催化降解行为。rGH-PANI / BiOI-70％复合材料在可见光下对罗丹明B（RhB）的去除率在静态和动态系统中分别达到100％和50.13％，分别是BiOI的12.85和3.58倍。5次循环后去除率未降低，表明rGH-PANI / BiOI光催化剂具有出色的可分离和可循环利用特性。这项工作为设计和构建具有优异的吸附和光催化协同作用的水凝胶基三元复合光催化剂提供了重要参考，在水污染处理方面显示出巨大的潜力。5次循环后去除率未降低，表明rGH-PANI / BiOI光催化剂具有出色的可分离和可循环利用特性。这项工作为设计和构建具有优异的吸附和光催化协同作用的水凝胶基三元复合光催化剂提供了重要参考，在水污染处理方面显示出巨大的潜力。5次循环后去除率未降低，表明rGH-PANI / BiOI光催化剂具有出色的可分离和可循环利用特性。这项工作为设计和构建具有优异的吸附和光催化协同作用的水凝胶基三元复合光催化剂提供了重要参考，在水污染处理方面显示出巨大的潜力。