Impacts of natural organic matter and electrolytes on aggregation kinetics of graphene oxide
SUN Bin-bin, ZHANG Yin-qing, WANG Kun-kun, ZHU Ling-yan
Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
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.
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