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Fungal mycelia functionalization with halloysite nanotubes for hyphal spreading and sorption behavior regulation: A new bio-ceramic hybrid for enhanced water treatment.
Water Research ( IF 12.8 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.watres.2020.116380
Hyoungjae Ahn 1 , Jalil Ur Rehman 2 , Taehyen Kim 1 , Min Seung Oh 1 , Ho Young Yoon 2 , Changgyo Kim 3 , Younki Lee 3 , Seung Gu Shin 4 , Jong-Rok Jeon 2
Affiliation  

Filamentous fungi are believed to remove a wide range of environmental xenobiotics due to their characteristically non-specific catabolic metabolisms. Nonetheless, irregular hyphal spreading can lead to clogging problems in treatment facilities and the dependence of pollutant bioavailability on hyphal surface features severely limits their applicability in water treatment. Here, we propose a scalable and facile methodology to structurally modify fungal hyphae, allowing for both the maximization of pollutant sorption and fungal pellet morphology self-regulation. Halloysite-doped mycelium architectures were efficiently constructed by dipping Aspergillus fumigatus pellets in halloysite nanotube-dispersed water. Ultrastructure analyses using scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy revealed that the nanotubes were mainly attached to the outer surface of the pellets. Fungal viability and exoenzyme production were hardly affected by the halloysites. Notably, nanotube doping appeared to be extremely robust given that detachments rarely occurred even in high concentrations of organic solvents and salt. It was also demonstrated that the doped halloysites weakened hyphal growth-driven gelation, thus maintaining sphere-like pellet structures. The water treatment potential of the hybrid fungal mycelia was assessed through both cationic toxic organic/inorganic-contaminated water and real dye industry wastewater clean-ups. Aided by the mesoporous halloysite sites on their surface, the removal abilities of the hybrid structures were significantly enhanced. Moreover, inherent low sorption ability of HNT for heavy metals was found to be overcome by the aid of fungal mycelia. Finally, universal feature of the dipping-based doping way was confirmed by using different filamentous fungi. Given that traditional approaches to effectively implement fungus-based water treatment are based mostly on polymer-based immobilization techniques, our proposed approach provides a novel and effective alternative via simple doping of living fungi with environmentally-benign clays such as halloysite nanotubes.



中文翻译:

带有埃洛石纳米管的真菌菌丝体功能化,可用于菌丝扩散和吸附行为调节:一种新型的生物陶瓷混合物,用于增强水处理能力。

丝状真菌由于其特征性的非特异性分解代谢而被认为能去除多种环境异生物。但是,不规则的菌丝扩散会导致处理设备出现堵塞问题,并且污染物生物利用度对菌丝表面特征的依赖性严重限制了它们在水处理中的适用性。在这里,我们提出了一种可扩展且简便的方法,可在结构上修饰真菌菌丝,使污染物吸附和真菌颗粒形态自我调节达到最大。通过浸入烟曲霉有效地构建了掺有埃洛石的菌丝体结构颗粒在埃洛石纳米管分散水中。使用配备了能量色散X射线光谱仪的扫描电子显微镜进行的超微结构分析表明,纳米管主要附着在颗粒的外表面。埃洛石几乎不影响真菌的活力和外酶的产生。值得注意的是,考虑到即使在高浓度的有机溶剂和盐中也很少发生分离,纳米管的掺杂似乎非常坚固。还表明,掺杂的埃洛石减少了菌丝生长驱动的胶凝作用,从而保持了球形的沉淀结构。杂合真菌菌丝体的水处理潜力通过阳离子有毒有机/无机污染水和实际染料工业废水的净化来评估。在其表面上的中孔埃洛石位点的辅助下,杂化结构的去除能力显着增强。此外,发现HNT固有的对重金属的低吸附能力可通过真菌菌丝体得到克服。最后,通过使用不同的丝状真菌证实了基于浸渍的掺杂方式的普遍特征。鉴于有效实施基于真菌的水处理的传统方法主要基于基于聚合物的固定化技术,我们提出的方法可通过对环境真菌(如埃洛石纳米管)进行简单掺杂来提供新颖有效的替代方法。发现通过真菌菌丝体可以克服HNT对重金属固有的低吸附能力。最后,通过使用不同的丝状真菌证实了基于浸渍的掺杂方式的普遍特征。鉴于有效实施基于真菌的水处理的传统方法主要基于基于聚合物的固定化技术,我们提出的方法可通过对环境真菌(如埃洛石纳米管)进行简单掺杂来提供新颖有效的替代方法。发现通过真菌菌丝体可以克服HNT对重金属固有的低吸附能力。最后,通过使用不同的丝状真菌证实了基于浸渍的掺杂方式的普遍特征。鉴于有效实施基于真菌的水处理的传统方法主要基于基于聚合物的固定化技术,我们提出的方法可通过对环境真菌(如埃洛石纳米管)进行简单掺杂来提供新颖有效的替代方法。

更新日期:2020-09-10
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