Miao Lingzhan, Wang Chao, Hou Jun, Wang Peifang, Ao Yanhui, Dai Shanshan, Lv Bowen
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, People's Republic of China.
Environ Sci Pollut Res Int. 2015 May;22(10):7696-704. doi: 10.1007/s11356-014-3952-y. Epub 2014 Dec 17.
The presence of nanoparticles (NPs) in natural aquatic environment is a potential risk to aquatic and human life. Periphyton, ubiquitous in aquatic environment, has been used to remove pollutants from aquatic systems. Understanding the interaction between NPs and periphyton will help to better predict the behavior and fate of NPs in aquatic media. This study was aimed to investigate the CuO NP biosorption mechanism by periphyton at acidic, neutral, and alkaline pH and with varying natural organic matter (NOM) concentrations. The rate of adsorption and removal of CuO NPs was decreased with increase in initial pH and NOM concentration. The zeta potential study suggests that the biosorption of CuO NPs by periphyton was related to electrostatic force of attraction. The particle size distribution of CuO NPs in solution with different NOM concentrations played an important role in CuO NP removal. The well fit between pseudo-first-order kinetics and adsorption process indicated that physical sorption appears to be the dominating process. These results show that periphyton can be employed for an environmentally benign and effective solution for NP removal.
天然水生环境中纳米颗粒（NPs）的存在对水生生物和人类生命构成潜在风险。附生植物在水生环境中普遍存在，已被用于从水生系统中去除污染物。了解纳米颗粒与附生植物之间的相互作用将有助于更好地预测纳米颗粒在水生介质中的行为和归宿。本研究旨在研究附生植物在酸性、中性和碱性pH值以及不同天然有机物（NOM）浓度下对CuO纳米颗粒的生物吸附机制。随着初始pH值和NOM浓度的增加，CuO纳米颗粒的吸附和去除速率降低。zeta电位研究表明，附生植物对CuO纳米颗粒的生物吸附与静电力吸引有关。不同NOM浓度溶液中CuO纳米颗粒的粒径分布在CuO纳米颗粒的去除中起重要作用。伪一级动力学与吸附过程的良好拟合表明物理吸附似乎是主导过程。这些结果表明，附生植物可用于一种环境友好且有效的纳米颗粒去除解决方案。
