Department of Environmental Engineering, Kyungpook National University, Daegu 41566, Republic of Korea.
Department of Food Science and Technology, Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea.
Int J Biol Macromol. 2020 Nov 1;162:1241-1249. doi: 10.1016/j.ijbiomac.2020.06.227. Epub 2020 Jun 26.
The current study, novel magnetic nano-composite particles (FeO@EPS) were successfully synthesized via the co-precipitation of iron (III) chloride and iron (II) sulfate (FeO nanoparticles) with exopolysaccharides (EPS) derived from the microalga Chlorella vulgaris. The physico-chemical nature of the FeO@EPS was investigated in depth. Transmission electron microscopy (TEM) results estimated the core-shell nature of FeO@EPS aggregated inside the indistinctly layered EPS matrix to be 10-20 nm in size. Scanning electron microscopy-based energy dispersive spectral analysis indicated that elemental Fe was successfully loaded on to the EPS polymeric ion-exchanger at a rate of 63.3% by weight. FT-IR results demonstrated that FeO nanoparticles were successfully modified by the functional groups present in EPS. FeO@EPS showed a highly magnetic nature at 5.0 emu/g. The XPS survey spectrum, which showed two major peaks at 724.1 and 710.2 eV revealed the elemental composition and electronic structure of FeO nanoparticles and FeO@EPS. Furthermore, nutrient removal from wastewater was studied. Under optimum conditions (3.5 g/L of FeO@EPS, pH 7.0 and 13 h of incubation) 91% of PO and 85% of NHwere effectively eliminated. These findings demonstrate the potential of FeO@EPS for removing PO and NH in wastewater treatment plants.
当前的研究通过共沉淀法成功合成了新型磁性纳米复合颗粒（FeO@EPS），其原料为铁（III）氯化物和铁（II）硫酸盐（FeO 纳米颗粒）与微藻小球藻来源的胞外多糖（EPS）。深入研究了 FeO@EPS 的物理化学性质。透射电子显微镜（TEM）结果表明，FeO@EPS 的核壳结构的尺寸为 10-20nm，其在不明显分层的 EPS 基质内聚集。基于扫描电子显微镜的能量色散光谱分析表明，元素铁以 63.3%的重量负载成功加载到 EPS 聚合物离子交换剂上。傅立叶变换红外光谱（FT-IR）结果表明，FeO 纳米颗粒成功地被 EPS 中存在的官能团修饰。FeO@EPS 在 5.0 emu/g 时表现出高度的磁性。X 射线光电子能谱（XPS）全谱图在 724.1 和 710.2 eV 处显示出两个主要峰，揭示了 FeO 纳米颗粒和 FeO@EPS 的元素组成和电子结构。此外，还研究了从废水中去除营养物质。在最佳条件下（3.5 g/L 的 FeO@EPS、pH 7.0 和 13 小时的孵育），PO 的去除率达到 91%，NH 的去除率达到 85%。这些发现表明 FeO@EPS 在废水处理厂中去除 PO 和 NH 的潜力。
