Non-toxic nano approach for wastewater treatment using Chlorella vulgaris exopolysaccharides immobilized in iron-magnetic nanoparticles
Non-toxic nano approach for wastewater treatment using Chlorella vulgaris exopolysaccharides immobilized in iron-magnetic nanoparticles
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DOI：
10.1016/j.ijbiomac.2020.06.227
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发表时间：
2020-11-01
影响因子：
8.2
通讯作者：
Kim, Woong
中科院分区：
文献类型：
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作者：
Govarthanan, M.;Jeon, Chang-Hyun;Kim, Woong
本研究采用Fe 3 O 4纳米粒子与小球藻胞外多糖（EPS）共沉淀的方法，成功制备了新型磁性纳米复合粒子（Fe3O4@EPS）。深入研究了Fe3O4@EPS的物理化学性质。透射电子显微镜（TEM）结果估计聚集在不清楚分层的EPS基质内的Fe3O4@EPS的核-壳性质为10-20 nm大小。扫描电子显微镜能谱分析表明，元素Fe成功地负载到EPS聚合物离子交换剂上，负载率为63.3%（重量）。FT-IR结果表明，Fe 3 O 4纳米粒子被EPS中的官能团成功修饰。Fe3O4@EPS显示出5.0 emu/g的高磁性。在724.1和710.2 eV处显示两个主峰的XPS测量光谱揭示了Fe 3 O 4纳米颗粒和Fe3O4@EPS的元素组成和电子结构。此外，还对废水中的营养物去除进行了研究。在最佳条件下（3.5g/L Fe3O4@EPS，pH 7.0，培养13 h），PO 43-和NH 4+的去除率分别为91%和85%。这些发现表明Fe3O4@EPS在污水处理厂中去除PO 43-和NH 4+的潜力。(C)2020由Elsevier B. V.出版
The current study, novel magnetic nano-composite particles (Fe3O4@EPS) were successfully synthesized via the co-precipitation of iron (III) chloride and iron (II) sulfate (Fe3O4 nanoparticles) with exopolysaccharides (EPS) derived from the microalga Chlorella vulgaris. The physico-chemical nature of the Fe3O4@EPS was investigated in depth. Transmission electron microscopy (TEM) results estimated the core-shell nature of Fe3O4@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 Fewas successfully loaded on to the EPS polymeric ion-exchanger at a rate of 63.3% by weight. FT-IR results demonstrated that Fe3O4 nanoparticles were successfully modified by the functional groups present in EPS. Fe3O4@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 Fe3O4 nanoparticles and Fe3O4@EPS. Furthermore, nutrient removal from wastewater was studied. Under optimum conditions (3.5 g/L of Fe3O4@EPS, pH 7.0 and 13 h of incubation) 91% of PO43- and 85% of NH4+ were effectively eliminated. These findings demonstrate the potential of Fe3O4@EPS for removing PO43- and NH4+ in wastewater treatment plants. (C) 2020 Published by Elsevier B.V.