Abstract The RP/g-C3N4 heterojunction photocatalyst was fabricated by a facile heat treatment strategy. The obtained composite has excellent light harvesting ability and charge separation performance. Compared to single RP and g-C3N4, the 50%-RP/g-C3N4 exhibited enhanced photocatalytic activity for simultaneously removing Cr(VI) and RhB, and the removal rates can reach 92% and 99% in 25 min, respectively. The enhanced mechanism was revealed by active species capturing experiments, showing that electrons can reduce Cr(VI) and produce O2– in air and that holes can directly oxidize the dyes. The coexistence of Cr(VI) and RhB will lead to a synergistic improvement of Cr(VI) reduction and RhB degradation due to rapid surface reactions. This further improves the charge separation except for the heterojunction effect. In addition, the COD analysis demonstrates that organic dyes are mainly degraded into CO2, H2O and some intermediates.

中文翻译：

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RP/g-C3N4光催化剂在可见光照射下协同改善Cr(VI)还原和RhB降解

摘要 RP/g-C3N4 异质结光催化剂是通过简单的热处理策略制备的。所得复合材料具有优异的光捕获能力和电荷分离性能。与单一RP和g-C3N4相比，50%-RP/g-C3N4同时去除Cr(VI)和RhB的光催化活性增强，25分钟内去除率分别达到92%和99%。活性物质捕获实验揭示了增强的机制，表明电子可以还原 Cr(VI) 并在空气中产生 O2- 并且空穴可以直接氧化染料。由于快速的表面反应，Cr(VI)和RhB的共存将导致Cr(VI)还原和RhB降解的协同改进。除了异质结效应外，这进一步改善了电荷分离。此外，