We successfully fabricated the three-dimensional (3D) hydrogel of titanium dioxide (TiO₂)-graphene using a simple one-pot method and exhibited enriched adsorption-photoelectrocatalytic degradation ability of low-concentration bisphenol A (BPA). Combined with the unique adsorption of graphene hydrogel and the effective photoelectrocatalytic performance of TiO₂, we rapidly enriched the organic pollutants and conducted efficient in situ degradation. The low-concentration BPA (20 mg/L) was degraded completely by the TiO₂-rGH electrode in 5 h through the synergistic effect of adsorption-photoelectrocatalytic. The photogenerated charge on the surface of TiO₂ is rapidly separated by the action of the applied electric field and the graphene sheet. The high conductivity of the graphene makes the TiO₂-graphene hydrogel rapidly conducting the charge and solves the problem of poor conductivity of the semiconductor electrode. On the basis of these advantages, the TiO₂-rGH has a cross-porous network structure that favors the anchor of more TiO₂ nanocrystals, the specific surface area and reactive sites are greater than the thin film electrode, and the structure is conducive to significantly improving the BPA removal efficiency. By contrast, the BPA degradation of TiO₂-rGO thin film electrode was 40% after 4 h of ultraviolet irradiation, whereas the removal rate of BPA over the same mass of TiO₂-rGH electrode rate was up to 96%.At the same time, the TiO₂-rGH electrode without filtering can be achieved quickly separated from the recovery due to its special macro-3D network structure. Its removal ability still maintains above 90% after 10 times cyclic experiments with self-regeneration characteristics. It can be achieved rapid separation and recovery without filtering.

中文翻译：

---

光电催化与吸附相结合在具有3D网络结构的TiO _2-石墨烯水凝胶上去除双酚A

我们使用简单的一锅法成功地制造了二氧化钛（TiO ₂）-石墨烯的三维（3D）水凝胶，并展现出低浓度双酚A（BPA）富集的吸附-光电催化降解能力。结合石墨烯水凝胶的独特吸附和TiO ₂的有效光电催化性能，我们迅速富集了有机污染物并进行了有效的原位降解。TiO ₂ -rGH电极在5小时内通过吸附-光电催化的协同作用将低浓度BPA（20 mg / L）完全降解。TiO ₂表面上的光生电荷在外加电场和石墨烯片的作用下，金属被迅速分离。石墨烯的高电导率使TiO _2-石墨烯水凝胶迅速传导电荷，并解决了半导体电极的电导率差的问题。基于这些优点，TiO ₂ -rGH具有交叉孔网络结构，有利于更多的TiO ₂纳米晶体的锚固，比表面积和反应位点大于薄膜电极，并且该结构有利于大大提高了BPA去除效率。相比之下，紫外线照射4 h后，TiO ₂ -rGO薄膜电极的BPA降解率为40％，而在相同质量的TiO上，BPA的去除率₂ -rGH电极率高达96％。同时，由于其特殊的macro-3D网络结构，无需过滤即可快速实现TiO ₂ -rGH电极与回收的分离。经过10次具有自我再生特性的循环实验后，其去除能力仍保持在90％以上。无需过滤即可快速分离和回收。