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 ...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 μg/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 BPAwas 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.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.21377006 and 40971181)
文摘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 μg/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 BPAwas 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.
