有机质和阳离子对氧化石墨烯团聚行为的影响

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Abstract In this study,the impacts of three typical natural organic matters (NOMs:humic acid (HA),fulvic acid (FA) and sodium alginate (SA)) at different concentrations (2 and 5mg/L,total organic carbon,TOC) and electrolyte types (Na⁺,Mg²⁺,Ca²⁺) on the aggregation kinetics of graphene oxide (GO) nanoparticles were investigated through dynamic light scattering.The GO aggregation kinetics without NOM followed the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) model and Schulze-Hardy rule.All the three NOMs at 2mg/L enhanced the stability of GO in the order of HA > FA > SA,which could be due to the strongest steric repulsive force exhibited by HA than FA and SA in the presence of Na⁺.In the presence of 2mg/L HA,which was selected as the representative NOM,it significantly enhanced the stability of GO in the solutions of Na⁺ and Mg²⁺;while it displayed marginal influence for Ca²⁺.When the HA concentration increased to 5mg/L,it did not further enhance the stability of GO in the solution of high concentration Mg²⁺ due to salting out effect of HA;while it depressed GO stability in the solution of Ca²⁺ with higher attachment efficiencies than the control experiment in the absence of any NOM.

Key words： graphene oxide (GO) aggregation kinetics natural organic matter (NOM) divalent cations

Received: 15 August 2017

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	Articles by authors
	SUN Bin-bin
	ZHANG Yin-qing
	WANG Kun-kun
	ZHU Ling-yan

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SUN Bin-bin,ZHANG Yin-qing,WANG Kun-kun等. Impacts of natural organic matter and electrolytes on aggregation kinetics of graphene oxide[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 985-992.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/985

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