Rare earth ions doped Bi₂WO₆/rGO hybrids (Re-BWG) were synthesized by a two-step process, and the introduction of rGO was achieved with the assistance of imidazole based ionic liquids (IL). IL could enhance the dispersion uniformity of rGO, which was beneficial to the combination of Bi₂WO₆ (BWO) and rGO. Rare earth ions and rGO increased the separation of electron–hole pairs of BWO and enhanced the adsorption for pollutants. Physical-chemical properties of BWO and Re-BWG were investigated by XRD, SEM/TEM, XPS, UV-Vis DRS, PL, EIS, and N₂ adsorption analysis. The photocatalytic activity of Re-BWG was envaulted by rhodamine (RhB) degradation under natural sunlight irradiation. Re-BWG possessed excellent photocatalytic activity compared to pure BWO. The proposed mechanism of photocatalytic degradation was deduced, in which the photogenerated O₂^•- and h⁺ (on the surface of Re-BWG) played the role of active species during reaction. The photocatalytic performance of Er-BWG was better than the other three Re (La, Ce, and Pr)-BWG hybrids, and the RhB removal efficiency was up to 99.12% within 60 min.

通过两步法合成了掺有稀土离子的Bi ₂ WO ₆ / rGO杂化物（Re-BWG），并在咪唑基离子液体（IL）的辅助下实现了rGO的引入。IL可以增强rGO的分散均匀性，这有利于Bi ₂ WO ₆（BWO）和rGO的结合。稀土离子和rGO增加了BWO的电子-空穴对的分离并增强了对污染物的吸附。通过XRD，SEM / TEM，XPS，UV-Vis DRS，PL，EIS和N ₂研究了BWO和Re-BWG的物理化学性质吸附分析。在自然日光照射下，若丹明（RhB）降解可增强Re-BWG的光催化活性。与纯BWO相比，Re-BWG具有出色的光催化活性。推导了所提出的光催化降解机理，其中光生O ₂ ^•-和h ⁺（在Re-BWG表面）在反应过程中起着活性物质的作用。Er-BWG的光催化性能优于其他三种Re（La，Ce和Pr）-BWG杂化物，RhB去除效率在60分钟内高达99.12％。