Human health is deteriorating due to the effluent containing heavy metal ions and organic dyes. Hence, photoreduction of Cr(VI) to Cr(III) and degradation of rhodamine B (RhB) using a novel photocatalyst is particularly important. In this work, h-BN/NiS₂/NiS composites were prepared via a simple solvothermal method and a double Z-scheme heterojunction was constructed for efficiently removing RhB and Cr(VI). The 7 wt-% h-BN/NiS₂/NiS composites were characterized via a larger specific surface area (15.12 m²·g⁻¹), stronger light absorption capacity, excellent chemical stability, and high yield of electrons and holes. The experimental result indicated that the photoreduction efficiency of the 7 wt-% h-BN/NiS₂/NiS photocatalyst achieved 98.5% for Cr(VI) after 120 min, which was about 3 times higher than that of NiS₂/NiS (34%). However, the removal rate of RhB by the 7 wt-% h-BN/NiS₂/NiS photocatalyst reached 80%. This is due to the double Z-scheme heterojunction formed between NiS₂/NiS and h-BN, which improved the charge separation efficiency and transmission efficiency. Besides, the influence of diverse photogenerated electron and hole scavengers upon the photoreduction of Cr(VI) was studied, the results indicated that graphene-like h-BN promoted transportation of photoinduced charges on the surface of the h-BN/NiS₂/NiS photocatalyst via the interfacial effects.

由于废水中含有重金属离子和有机染料，人类健康正在恶化。因此，使用新型光催化剂将 Cr(VI) 光还原为 Cr(III) 和降解罗丹明 B (RhB) 尤为重要。在这项工作中，通过简单的溶剂热法制备了h -BN/NiS ₂ /NiS 复合材料，并构建了双 Z 型异质结以有效去除 RhB 和 Cr(VI)。7 wt-% h -BN/NiS ₂ /NiS 复合材料的特征在于更大的比表面积 (15.12 m ² ·g ^-1)、更强的光吸收能力、优异的化学稳定性、高电子和空穴产率。实验结果表明，7 wt-% h -BN/NiS ₂ /NiS 光催化剂对 Cr(VI) 的光还原效率在 120 min 后达到 98.5%，比 NiS ₂ /NiS (34 %）。然而，7 wt-% h -BN/NiS ₂ /NiS 光催化剂对 RhB 的去除率达到了 80%。这是由于 NiS ₂ /NiS 和h之间形成了双 Z 型异质结-BN，提高了电荷分离效率和传输效率。此外，研究了多种光生电子和空穴清除剂对 Cr(VI) 光还原的影响，结果表明类石墨烯h -BN 促进了h -BN/NiS ₂ /NiS表面光生电荷的传输。光催化剂通过界面效应。