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CuS nanoparticles in humid environments: adsorbed water enhances the transformation of CuS to CuSO4.
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-20 , DOI: 10.1039/d0nr05934j Haibin Wu 1 , Victor W Or 1 , Sabrina Gonzalez-Calzada 2 , Vicki H Grassian 3
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-20 , DOI: 10.1039/d0nr05934j Haibin Wu 1 , Victor W Or 1 , Sabrina Gonzalez-Calzada 2 , Vicki H Grassian 3
Affiliation
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Covellite copper sulfide nanoparticles (CuS NPs) have attracted immense research interest due to their widespread use in a range of biological and energy applications. As such, it is crucial to understand the transformations of these nanomaterials and how these transformations influence the behavior of these nanoparticles in environmental and biological systems. This study specifically focuses on understanding the role of water vapor and adsorbed water in the transformation of CuS NP surfaces to CuSO4 in humid environments. Surface sulfide ions are oxidized to sulfate by oxygen in the presence of water vapor, as detected by atomic force microscopy based photothermal infrared spectroscopy (AFM-PTIR) and in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. These results show that the transformation of CuS to CuSO4 is highly dependent on relative humidity (RH). While sulfide to sulfate conversion is not observed to a great extent at low RH (<20%), there is significant conversion at higher RH (>80%). X-ray photoelectron spectroscopy (XPS) analysis confirms that sulfide is irreversibly oxidized to sulfate. Furthermore, it shows that initially, the Cu ions possess the original oxidation state similar to the original covellite, i.e. Cu+, but they are oxidized to Cu2+ at higher RH. The formation of CuSO4 has also been confirmed by HRTEM. These analyses show that adsorbed water on the NP surfaces enhances the conversion of sulfide to sulfate and the oxidation of Cu+ to Cu2+ in the presence of molecular oxygen.
中文翻译：
潮湿环境中的CuS纳米颗粒：吸附的水促进了CuS向CuSO4的转化。
Covellite硫化铜纳米颗粒（CuS NPs）由于其在一系列生物和能源应用中的广泛应用而引起了巨大的研究兴趣。因此，了解这些纳米材料的转变以及这些转变如何影响这些纳米粒子在环境和生物系统中的行为至关重要。这项研究特别着重于了解水蒸气和吸附水在潮湿环境中将CuS NP表面转化为CuSO 4的作用。表面硫离子在存在水蒸气的情况下被氧气氧化为硫酸根，这是通过基于原子力显微镜的光热红外光谱法（AFM-PTIR）和原位检测的衰减全反射傅里叶变换红外（ATR-FTIR）光谱。这些结果表明，CuS向CuSO 4的转化高度依赖于相对湿度（RH）。虽然在低RH（<20％）下未观察到硫化物到硫酸盐的转化率很大，但在较高RH（> 80％）下有明显的转化率。X射线光电子能谱（XPS）分析证实，硫化物不可逆地氧化为硫酸盐。此外，它表明，最初，Cu离子具有与原始Covellite相似的原始氧化态，即Cu +，但它们在较高的RH下被氧化为Cu 2+。CuSO 4的形成HRTEM也已确认。这些分析表明，在分子氧存在下，NP表面上吸附的水可增强硫化物向硫酸盐的转化以及Cu +向Cu 2+的氧化。
更新日期：2020-10-02
中文翻译：
潮湿环境中的CuS纳米颗粒：吸附的水促进了CuS向CuSO4的转化。
Covellite硫化铜纳米颗粒（CuS NPs）由于其在一系列生物和能源应用中的广泛应用而引起了巨大的研究兴趣。因此，了解这些纳米材料的转变以及这些转变如何影响这些纳米粒子在环境和生物系统中的行为至关重要。这项研究特别着重于了解水蒸气和吸附水在潮湿环境中将CuS NP表面转化为CuSO 4的作用。表面硫离子在存在水蒸气的情况下被氧气氧化为硫酸根，这是通过基于原子力显微镜的光热红外光谱法（AFM-PTIR）和原位检测的衰减全反射傅里叶变换红外（ATR-FTIR）光谱。这些结果表明，CuS向CuSO 4的转化高度依赖于相对湿度（RH）。虽然在低RH（<20％）下未观察到硫化物到硫酸盐的转化率很大，但在较高RH（> 80％）下有明显的转化率。X射线光电子能谱（XPS）分析证实，硫化物不可逆地氧化为硫酸盐。此外，它表明，最初，Cu离子具有与原始Covellite相似的原始氧化态，即Cu +，但它们在较高的RH下被氧化为Cu 2+。CuSO 4的形成HRTEM也已确认。这些分析表明，在分子氧存在下，NP表面上吸附的水可增强硫化物向硫酸盐的转化以及Cu +向Cu 2+的氧化。
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