Background

Fe²⁺/H₂O₂-based photo-Fenton process is often used in pollutions removal. But, Fe-species related low activity at neutral condition hinders their practical applications. Activation of in situ generated H₂O₂ for Fenton-like degradation of pollutions through catalysts absences of Fe species is expected.

Methods

A strip-like benzene and K⁺ co-doped g-C₃N₄ (KBCN) was constructed by the thermal polymerization of assembly of melamine and 2-aminoterephthalic acid, then post-calcination in LiCl–KCl molten salt, which was then used to degrade Rhodamine B (RhB) and Congo red (CR) via in situ generated H₂O₂.

Significant findings

Benzene and K⁺ co-doping were critical both in increasing charge separation and enhancing the H₂O₂ production. The yield of H₂O₂ for KBCN was 57.5 μM in pure water after 60 min irradiation. In the absence of Fe²⁺, the in situ generated H₂O₂ could subsequently degrade RhB and CR with the formed ·OH. The apparent rate constants of KBCN for RhB and CR degradation were 0.0446 and 0.0497 min⁻¹, respectively. The advantages of degradation with in situ generated H₂O₂ in the absence of Fe²⁺ can provide a new prospective to the environmental friendly Fenton-like reaction.

中文翻译：

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苯和 K+ 共掺杂的氮化碳与原位生成的 H2O2 增强类芬顿降解罗丹明 B 和刚果红

背景

Fe ²⁺ /H ₂ O ₂基光芬顿法常用于污染物去除。但是，在中性条件下与 Fe 物种相关的低活性阻碍了它们的实际应用。预期通过催化剂不存在 Fe 物种激活原位生成的 H ₂ O ₂以进行类似芬顿的污染降解。

方法

通过三聚氰胺和2-氨基对苯二甲酸的组装热聚合，然后在LiCl-KCl熔盐中后煅烧，构建了条状苯和K ⁺共掺杂的gC ₃ N ₄ (KBCN)，然后用于通过原位生成的 H ₂ O ₂降解罗丹明 B (RhB) 和刚果红 (CR) 。

重要发现

苯和K ⁺共掺杂对于增加电荷分离和提高 H ₂ O ₂产量都至关重要。60 分钟照射后，KBCN的 H ₂ O ₂在纯水中的产率为 57.5 μM。在不存在的Fe ²⁺中，在原位生成的ħ ₂ ö ₂随后可能劣化罗丹明B和CR与形成的·OH。KBCN 对 RhB 和 CR 降解的表观速率常数分别为 0.0446 和 0.0497 min ^-1。在没有 Fe 的情况下使用原位生成的 H ₂ O ₂进行降解的优势²⁺可以为环境友好的类芬顿反应提供新的前景。