A facile strategy to fabricate hollow cadmium sulfide nanospheres with nanoparticles-textured surface for hexavalent chromium reduction and bacterial inactivation

作者：Zhang, Lei; Niu, Cheng-Gang^*; Wen, Xiao-Ju; Guo, Hai; Zhao, Xiu-Fei; Huang, Da-Wei; Zeng, Guang-Ming^*

来源：Journal of Colloid and Interface Science, 2018, 514: 396-406.

DOI：10.1016/j.jcis.2017.12.048

• Hollow CdS nanospheres
• Enhanced visible light absorption
• Nanoparticle-textured surface
• Photocatalytic disinfection
• Cr(VI) reduction

Exploring morphology and surface structure of semiconductor photocatalyst is crucial for researching their photocatalytic performance. In this paper, hollow CdS nanospheres (CdS-HSs) were successfully fabricated via simple template self-removal strategy. The prepared CdS-HSs were characterized by XRD, SEM, HR-TEM, UV-vis diffuse reflectance spectra (DRS), XPS, photocurrent response (I-T), photoluminescence (PL) and electrochemistry impedance spectroscopy (EIS). It was found that the prepared CdS-HSs have nanoparticles-textured surface composed of ultra-small CdS nanoparticles (similar to 20 nm) and large surface areas. DRS result demonstrated that the CdS-HSs exhibit strong visible light absorption capacity. The results of photocurrent response, photoluminescence and EIS revealed that hollow structure and nanoparticles-textured surface can effectively increase light reflection effect and decrease recombination rate of electrons and holes. Compared to the traditional CdS, the hollow CdS nanospheres exhibit higher photocatalytic activity on Cr(VI) reduction under visible light irradiation, which are primarily attributed to its rapid separation of electron-hole pairs and improved visible light absorption. Moreover, CdS-HSs was also demonstrated as an effective and potential material on photocatalytic disinfection. The result of mechanism experiments proved that h(+), e(-) and O-2(center dot-) play important roles on the bacteria inactivation.

• 出版日期2018-3-15
• 单位环境保护部华南环境科学研究所; 湖南大学