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首页> 外文期刊>Catalysis science & technology >Enhanced visible light harnessing and oxygen vacancy promoted N, S co-doped CeO2 nanoparticle: a challenging photocatalyst for Cr(VI) reduction
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Enhanced visible light harnessing and oxygen vacancy promoted N, S co-doped CeO2 nanoparticle: a challenging photocatalyst for Cr(VI) reduction

机译：提高可见光的利用和氧气空置提升N, S co-doped CeO2纳米颗粒:一个具有挑战性的光催化剂对铬(VI)的减少

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摘要

Nanoceria and its derivatives are promising photocatalysts for environmental sustainability due to their strong redox ability, high oxygen storage/release capacity, eco-friendly nature, photostability and cost effectiveness. This study highlights the first time N/S co-doped ceria prepared using a simple hydrothermal method from a Ce(NO)(3) and thiourea source. The spectrographic, crystallographic and macroscopic features of the as-synthesised photocatalysts were characterised by TEM, DRUV-vis, PL, TRPL, XRD, Raman and photoelectrochemical measurements. Under visible light illumination, doped ceria exhibits remarkable photocatalytic activity towards Cr(VI) reduction, in contrast to neat CeO2. The enhanced photoreduction ability of doped species, particularly 36 h treated samples (NCS-36), is due to more light absorption capacity, greater photocurrent generation and high concentration of photoexcited electrons, which were well supported by characterization techniques. The average lifetime decay of photoexcited electrons and the photocurrent density of NCS-36 were found to be 75.37 ps and 3.87 mA cm(-2), which is nearly 3- and 12-times higher than that of neat ceria, respectively. These obtained results clearly explain the 93% photoreduction ability of NCS-36 towards a 50 ppm Cr(VI) solution within a time span of 120 min under visible light irradiation.
机译：Nanoceria及其衍生物是有前途的论文对环境可持续性由于其氧化还原能力强、高氧存储/释放能力,环保自然,耐光性和成本效益。强调第一次N / S co-doped二氧化铈准备使用一个简单的水热法Ce (NO)(3)和硫脲的来源。光谱、晶体和宏观的特点as-synthesised催化剂以TEM, DRUV-vis、PL TRPL,x射线衍射、拉曼和光电化学测量。在可见光照明,掺杂二氧化铈展品的光催化活性对铬(VI)减少,而整洁CeO2。掺杂的物种,尤其是36 h样本(NCS-36),是由于更多的光吸收能力,更大的光电流生成和高浓度的光激的电子,良好支持的特性技术。光激的电子和光电流密度75.37 ps和NCS-36被发现马3.87厘米(2),这是近3 - 12倍分别高于纯二氧化铈。这些结果清楚地解释了93%光致还原作用的能力NCS-36向50 ppm铬(VI) 120分钟的时间跨度内的解决方案可见光照射下。

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