Accelerated effects of nano-ZnO on phosphorus removal by Chlorella vulgaris: Formation of zinc phosphate crystallites
Accelerated effects of nano-ZnO on phosphorus removal by Chlorella vulgaris: Formation of zinc phosphate crystallites
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纳米 ZnO 对小球藻除磷的加速作用：磷酸锌微晶的形成
DOI：
10.1016/j.scitotenv.2018.04.017
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发表时间：
2018
影响因子：
9.8
通讯作者：
Ge Fei
中科院分区：
文献类型：
--
作者：
Xiao Huaixian;Liu Na;Tian Ke;Liu Shixiang;Ge Fei
据报道，纳米颗粒会对水生生物产生毒性，然而，它们对藻类去除废水中磷的潜在影响尚不清楚。研究了纳米ZnO（nano-ZnO）对绿色小球藻（Chlorella vulgaris）去除磷酸盐（PO 43-）的影响。我们发现，与对照组（无纳米ZnO）相比，高浓度的纳米ZnO（0.04-0.15 mM）加速了PO 43 −的去除效率，但低浓度的纳米ZnO（0.005-0.04 mM）降低了PO 43 −的去除效率，这表明C. vulgaris与纳米ZnO浓度有关。利用透射电子显微镜（TEM）结合X射线能谱（EDX）观察了纳米ZnO的形貌变化，并在纳米ZnO表面检测到P元素，表明PO 43-与纳米ZnO或纳米ZnO中溶解的Zn 2+发生了相互作用。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 3（PO 4）2微晶的形成，最终加速了PO 43-的去除。
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 (PO43−) removal by a green algaChlorella vulgariswere investigated. We found that PO43−removal efficiency was accelerated with high concentrations of nano-ZnO (0.04–0.15 mM) but reduced with low concentrations of nano-ZnO (0.005–0.04 mM) compared to the control (without nano-ZnO), suggesting that PO43−removal efficiency byC. vulgariswas 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)2crystallites sedimentation by employing X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), which finally accelerates the removal of PO43−.