Carbon- and oxygen-doped hexagonal boron nitrides (BCNOs) with good chemical stability and photoresponsiveness to visible light are found to be promising metal-free catalysts for degradation of Rhodamine B (RhB). By doping with heteroatoms of carbon and oxygen, insulating hexagonal boron nitride was transformed into semiconducting BCNO. The BCNO photocatalyst presents photodegradation performance towards RhB, with degradation rates up to 1.39 h⁻¹ (0.05 wt% catalyst loading). The active species involved in the photoreaction were demonstrated to be superoxide anion radical (˙O₂ ⁻) and holes (h⁺), as opposed to ˙OH in the most studied titanium dioxide. The stability of BCNO in highly acidic environments was exploited for catalyst regeneration, as is necessary after long-term use and poisoning. This work demonstrates that BCNO is a promising low-cost and metal-free photocatalyst for environmental pollution remediation.

中文翻译：

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碳氧掺杂六方氮化硼降解有机污染物

碳和氧掺杂的六方氮化硼 (BCNOs) 具有良好的化学稳定性和对可见光的光响应性，被发现是用于降解罗丹明 B (RhB) 的有前途的无金属催化剂。通过掺杂碳和氧的杂原子，绝缘六方氮化硼被转化为半导体 BCNO。BCNO 光催化剂对 RhB 具有光降解性能，降解速率高达 1.39 h ^-1（0.05 wt% 催化剂负载）。参与光反应的活性物质被证明是超氧阴离子自由基（˙O ₂ ^-）和空穴（h ⁺)，而不是研究最多的二氧化钛中的 ˙OH。BCNO 在高酸性环境中的稳定性被用于催化剂再生，这是长期使用和中毒后所必需的。这项工作表明，BCNO 是一种有前途的低成本、无金属光催化剂，用于环境污染修复。