Photochemical transformation of C3N4 under UV irradiation: Implications for environmental fate and photocatalytic activity.,Journal of Hazardous Materials

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Photochemical transformation of C3N4 under UV irradiation: Implications for environmental fate and photocatalytic activity.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-03-18 , DOI: 10.1016/j.jhazmat.2020.122557
Yiping Feng ₁ , Mengyao Shen ₁ , Zhijie Xie ₁ , Ping Chen ₁ , Lin-Zi Zuo ₂ , Kun Yao ₁ , Wenying Lv ₁ , Guoguang Liu ₁

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In this study, the photo-transformations of bulk C3N4 (CN) and oxidized C3N4 (OCN) under UV-irradiation were examined. Through NO3- release measurements, we found that the photo-transformation rate of OCN is higher than that of CN. Various characterization results revealed the structural and chemical properties changes of CN and OCN after photo-transformation. We proposed that under reactive oxygen species attack, CN and OCN were gradually broken into smaller fragments and finally mineralized into NO3-, CO2, and H2O through the circular reactions of deamination-hydroxylation-decarboxylation. Through the zeta potential measurements and sedimentation experiments, the influence of photo-transformation on the water stabilities of CN and OCN were assessed. The stability of CN in water increased while the water stability of OCN decreased after photo-transformation, implying that the changes to C3N4-based materials caused by photo-transformation may significantly impact their environmental behaviors. Moreover, the photocatalytic activities of the photo-transformed OCN and CN substantially decreased, indicating that the structural changes might be the main reason for their photocatalytic activity loss. These findings highlight the non-negligible influence of photo-transformation on the fate of C3N4 in aquatic environments, as well as on the photochemical stability during its use.

中文翻译：

紫外线照射下C3N4的光化学转化：对环境命运和光催化活性的影响。

在这项研究中，检查了紫外线照射下本体C3N4（CN）和氧化的C3N4（OCN）的光转化。通过NO3释放测量，我们发现OCN的光转化率高于CN。各种表征结果揭示了光转化后CN和OCN的结构和化学性质的变化。我们提出在活性氧的攻击下，CN和OCN逐渐分解成较小的碎片，并最终通过脱氨-羟基化-脱羧化的环状反应矿化为NO3-，CO2和H2O。通过ζ电位测量和沉降实验，评估了光转化对CN和OCN水稳定性的影响。光转化后，CN在水中的稳定性增加，而OCN的水稳定性下降，这表明由光转化引起的C3N4基材料的变化可能会显着影响其环境行为。而且，光转化的OCN和CN的光催化活性大大降低，表明结构变化可能是其光催化活性丧失的主要原因。这些发现强调了光转化对C3N4在水生环境中的命运以及在其使用过程中的光化学稳定性的不可忽略的影响。光转化后的OCN和CN的光催化活性大大降低，表明结构变化可能是其光催化活性丧失的主要原因。这些发现强调了光转化对C3N4在水生环境中的命运以及在其使用过程中的光化学稳定性的不可忽略的影响。光转化后的OCN和CN的光催化活性大大降低，表明结构变化可能是其光催化活性丧失的主要原因。这些发现强调了光转化对水生环境中C3N4的命运以及使用过程中光化学稳定性的不可忽视的影响。

更新日期：2020-03-19

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