Accelerated effects of nano-ZnO on phosphorus removal by Chlorella vulgaris: Formation of zinc phosphate crystallites

作者：Xiao, Huaixian; Liu, Na; Tian, Ke; Liu, Shixiang; Ge, Fei^*

来源：Science of the Total Environment, 2018, 635: 559-566.

DOI：10.1016/j.scitotenv.2018.04.017

• Nano-ZnO
• Phosphorus removal
• Crystallites
• Algae

Nanoparticles have been reported to induce toxicity to aquatic organisms, however, their potential impacts on phosphorus removal fromwastewater by algae are unclear. In this study, the effects of nanoparticle ZnO (nano-ZnO) on phosphate (PO43-) removal by a green alga Chlorella vulgaris were investigated. We found that PO(4)(3-)removal efficiency was acceleratedwith high concentrations of nano-ZnO (0.04-0.15mM) but reducedwith low concentrations of nano-ZnO (0.005-0.04 mM) compared to the control (without nano-ZnO), suggesting that PO43- removal efficiency by C. vulgaris was related to nano-ZnO concentrations. Moreover, we observed changes of nano-ZnO morphology and detected element P on the surface of nano-ZnO by using transmission electronic microscopy (TEM) combined with energy dispersive X-ray spectroscopy (EDX), indicating that PO43- was interacted with nano-ZnO or the dissolved Zn2+ from nano-ZnO. Furthermore, we confirmed this interaction induced the formation of Zn3(PO4)(2) crystallites sedimentation by employing X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), which finally accelerates the removal of PO43-.

• 出版日期2018-9-1
• 单位湘潭大学