Electroactive properties of EABs in response to long-term exposure to polystyrene microplastics/nanoplastics and the underlying adaptive mechanisms.
Electroactive properties of EABs in response to long-term exposure to polystyrene microplastics/nanoplastics and the underlying adaptive mechanisms.
复制标题
DOI：
10.1016/j.jhazmat.2024.133438
复制
发表时间：
2024-01
影响因子：
13.6
通讯作者：
Feng-Ai Yang;Yaguang Hou;Ce Cao;Cong Huang;Shaoheng Shen;Nanqi Ren;Ai-Jie Wang;Jianbo Guo-Jianbo-Gu
中科院分区：
文献类型：
--
作者：
Feng-Ai Yang;Yaguang Hou;Ce Cao;Cong Huang;Shaoheng Shen;Nanqi Ren;Ai-Jie Wang;Jianbo Guo-Jianbo-Gu
由于聚苯乙烯（PS）微塑料/纳米塑料（MP/NP）的广泛存在，电活性生物膜（EABs）长期暴露于含PS的水环境的电活性响应和适应机制尚不清楚。因此，本研究调查了PS MP/NP对EABs电活性的影响。结果发现，EABs表现出延迟形成后，最初的曝光，但显示出增加的最大电流密度（Imax）后，随后曝光长达55天。值得注意的是，暴露于NH 2 PSNPs（EAB-NH 2 PSNPs）的EAB表现出比对照高50%的Imax，沿着的是活力增加17.84%和生物量增加58.10%。EAB-NH 2 PSNPs的c-Cyts含量增加了178.35%，有利于EABs的胞外电子传递（EET）。此外，细菌群落组装表明，电活性细菌的相对丰度增加到87.56%的EAB-NH 2 PSNPs。EABs在PS MP/NP长期暴露下的适应机制主要通过调节生存力、EET和细菌群落组装来实现，并通过结构方程模型进一步证实了其与Imax的正相关性。这些发现为深入了解MP/NP对EABs甚至功能微生物的电活性特性的长期影响和机制提供了更深入的见解。
Given widespread presence of polystyrene (PS) microplastics/nanoplastics (MPs/NPs), the electroactive responses and adaptation mechanisms of electroactive biofilms (EABs) exposed long-term to PS-containing aquatic environments remain unclear. Therefore, this study investigated the impacts of PS MPs/NPs on electroactivity of EABs. Results found that EABs exhibited delayed formation upon initially exposure but displayed an increased maximum current density (Imax) after subsequent exposure for up to 55 days. Notably, EABs exposure to NH2PS NPs (EAB-NH2PSNPs) demonstrated a 50% higher Imaxthan the control, along with a 17.84% increase in viability and a 58.10% increase in biomass. The cytochromec(c-Cyts) content in EAB-NH2PSNPs rose by 178.35%, benefiting the extracellular electron transfer (EET) of EABs. Moreover, bacterial community assembly indicated the relative abundance of electroactive bacteria increased to 87.56% in EAB-NH2PSNPs. The adaptability mechanisms of EABs under prolonged exposure to PS MPs/NPs predominantly operate by adjusting viability, EET, and bacterial community assembly, which were further confirmed a positive correlation with Imaxthrough structural equation model. These findings provide deeper insights into long-term effects and mechanisms of MPs/NPs on the electroactive properties of EABs and even functional microorganisms in aquatic ecosystems.