CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, PR China.
School of Chemical and Environmental Engineering, Wuyi University, Jiangmen 529020, China.
Environ Pollut. 2018 Dec;243(Pt B):1802-1809. doi: 10.1016/j.envpol.2018.10.010. Epub 2018 Oct 5.
Although the aggregation of graphene oxide (GO) has been widely researched, the influence of the GO size on the homoaggregation behavior and its interaction with environmental media are still unexplored. In this work, critical coagulation concentration (CCC) values for GO with different sizes, from micro to nanosheet, were measured with NaCl and CaCl electrolytes, and the results indicated that GO with the largest size presented the smallest CCC value. Aluminum oxide (AlO) was selected as a natural solid particle representative to mimic the interaction between GO and environmental media. Batch experiments were conducted in solution with different pH and ionic strength. Results indicated that the attachment capacity of large GO onto AlO particles was greater than that of small GO. The experimental data were well fitted with Freundlich model. The electrostatic attraction and hydrogen-bonding interaction dominated the interaction process between GO and AlO. These findings are important for better understanding in the environmental fate and transport of GO.
虽然氧化石墨烯（GO）的聚集已经得到了广泛的研究，但 GO 尺寸对均相聚沉行为及其与环境介质的相互作用的影响仍未得到探索。在这项工作中，使用 NaCl 和 CaCl 电解质测量了不同尺寸（从微片到纳米片）的 GO 的临界聚沉浓度（CCC）值，结果表明尺寸最大的 GO 呈现出最小的 CCC 值。氧化铝（AlO）被选为天然固体颗粒的代表，以模拟 GO 与环境介质的相互作用。在不同 pH 值和离子强度的溶液中进行了批量实验。结果表明，大尺寸 GO 颗粒对 AlO 的附着能力大于小尺寸 GO。实验数据与 Freundlich 模型拟合良好。静电吸引和氢键相互作用主导了 GO 和 AlO 之间的相互作用过程。这些发现对于更好地理解 GO 在环境中的归宿和迁移具有重要意义。
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