Cotransport of graphene oxides/reduced graphene oxides with BPA in both bare and iron oxides coated quartz sand
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This study investigated the cotransport behaviors of graphene oxides (GO) and reduced graphene oxides (RGO) with bisphenol A (BPA) in porous media in both NaCl (1 and 10 mmol/L) and CaCl2 solutions (0.5 and 1.5 mmol/L) at pH 6.5. Both bare and iron oxides-coated quartz sand were employed as porous media in present study. We found that under all examined solution conditions, the presence of BPA (100 µ/L) did not have obvious influence on the transport of both GO and RGO (8 mg/L as TOC) in both bare and iron oxides-coated quartz sand. Although the dissolved BPA was the major form dominating the transport behaviors of total BPA in the presence of GO/RGO, yet the GO/RGO-associated BPA (due to the adsorption of BPA onto GO/RGO surfaces) also had some contribution to the transport of total BPA in the presence of GO/RGO in two types of porous media. Overall, due to the different transport behaviors of GO and RGO under different solution conditions, we found that the presence of GO/RGO decreased the transport of total BPA under all examined solution conditions in two types of porous media with the smallest decrease in 1 mmol/L NaCl solutions and the largest in 1.5 mmol/L CaCl2 solutions. The results of this study clearly indicated that when BPA was co-present with GO/RGO, the transport behaviors of GO/RGO in porous media would have great influences on the fate and transport of BPA in natural environments due to their adsorption onto GO/RGO.
KeywordsBPA graphene oxides cotransport vehicle effect porous media
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