Department of Environment, College of Environment and Resources, Xiangtan University, Xiangtan 411105, PR China.
Department of Environment, College of Environment and Resources, Xiangtan University, Xiangtan 411105, PR China.
Sci Total Environ. 2018 Sep 1;635:559-566. doi: 10.1016/j.scitotenv.2018.04.017. Epub 2018 Apr 24.
Nanoparticles have been reported to induce toxicity to aquatic organisms, however, their potential impacts on phosphorus removal from wastewater by algae are unclear. In this study, the effects of nanoparticle ZnO (nano-ZnO) on phosphate (PO) removal by a green alga Chlorella vulgaris were investigated. We found that PO removal efficiency was accelerated with high concentrations of nano-ZnO (0.04-0.15mM) but reduced with low concentrations of nano-ZnO (0.005-0.04mM) compared to the control (without nano-ZnO), suggesting that PO 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 PO was interacted with nano-ZnO or the dissolved Zn from nano-ZnO. Furthermore, we confirmed this interaction induced the formation of Zn(PO) crystallites sedimentation by employing X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), which finally accelerates the removal of PO.
纳米颗粒已被报道会对水生生物产生毒性，然而，它们对藻类从废水中去除磷的潜在影响尚不清楚。在本研究中，研究了纳米氧化锌（nano-ZnO）对小球藻（Chlorella vulgaris）去除磷酸盐（PO）的影响。我们发现，与对照组（无纳米 ZnO）相比，高浓度纳米 ZnO（0.04-0.15mM）可加速 PO 去除效率，但低浓度纳米 ZnO（0.005-0.04mM）则降低了 PO 去除效率，这表明小球藻对 PO 的去除效率与纳米 ZnO 浓度有关。此外，我们通过透射电子显微镜（TEM）结合能量色散 X 射线光谱（EDX）观察到纳米 ZnO 形态的变化，并在纳米 ZnO 表面检测到元素 P，表明 PO 与纳米 ZnO 或纳米 ZnO 中溶解的 Zn 相互作用。此外，我们通过 X 射线衍射分析（XRD）和 X 射线光电子能谱（XPS）证实了这种相互作用诱导了 Zn（PO）晶的形成和沉淀，从而最终加速了 PO 的去除。
