摘要
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.
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.
基金
supported by the National Natural Science Foundation of China(Grant Nos.21377006 and 40971181)
