Impact of Al2O3 on the Aggregation and Deposition of Graphene Oxide

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• 作者：Xuemei Ren ; Jiaxing Li ; Xiaoli Tan ; Weiqun Shi ; Changlun Chen ; Dadong Shao ; Tao Wen ; Longfei Wang ; Guixia Zhao ; Guoping Sheng ; Xiangke Wang
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：May 20, 2014
• 年：2014
• 卷：48
• 期：10
• 页码：5493-5500
• 全文大小：407K
• 年卷期：v.48,no.10(May 20, 2014)
• ISSN：1520-5851

文摘

To assess the environmental behavior and impact of graphene oxide (GO) on living organisms more accurately, the aggregation of GO and its deposition on Al₂O₃ particles were systematically investigated using batch experiments across a wide range of solution chemistries. The results indicated that the aggregation of GO and its deposition on Al₂O₃ depended on the solution pH and the types and concentrations of electrolytes. MgCl₂ and CaCl₂ destabilized GO because of their effective charge screening and neutralization, and the presence of NaH₂PO₄ and poly(acrylic acid) (PAA) improved the stability of GO with the increase in pH values as a result of electrostatic interactions and steric repulsion. Specifically, the dissolution of Al₂O₃ contributed to GO aggregation at relatively low pH or high pH values. Results from this study provide critical information for predicting the fate of GO in aquatic-terrestrial transition zones, where aluminum (hydro)oxides are present.