Adsorption of Polycyclic Aromatic Hydrocarbons on Graphene Oxides and Reduced Graphene Oxides
Adsorption of Polycyclic Aromatic Hydrocarbons on Graphene Oxides and Reduced Graphene Oxides
复制标题
DOI：
10.1002/asia.201300496
复制
发表时间：
2013-11-01
影响因子：
4.1
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Sun, Yubing;Yang, Shubin;Wang, Xiangke
石墨烯由于其独特的物理化学性质，在多学科的研究中引起了越来越多的关注。本文用间歇吸附技术研究了多环芳烃(PAHs)在还原石墨烯氧化物(RGOS)和氧化石墨烯(GOS)上的吸附与pH、腐植酸(HA)和温度的关系。为了进行比较，本研究中还使用了非极性和无孔石墨。PH从2增加到11不影响多环芳烃在rGO上的吸附，但在HA存在下和高温条件下，NAP在rGO上的吸附都受到抑制。多环芳烃在rGO上的吸附等温线符合Polanyi-Dubinin-Ashtahhov(PDA)模型，表明吸附涉及孔填充和平面吸附。由PDA模型计算的rGO对多环芳烃的饱和吸附容量(单位：mmolg(-1))按NAP>；PYR>；ANT的顺序显著降低，与理论计算结果相当。NAP在RGO上的吸附主要以孔填充机理为主，而ANT和PYR在RGO上的吸附机理为平面吸附。
Graphene has attracted increasing attention in multidisciplinary studies because of its unique physical and chemical properties. Herein, the adsorption of polycyclic aromatic hydrocarbons (PAHs), such as naphthalene (NAP), anthracene (ANT), and pyrene (PYR), on reduced graphene oxides (rGOs) and graphene oxides (GOs) as a function of pH, humic acid (HA), and temperature were elucidated by means of a batch technique. For comparison, nonpolar and nonporous graphite were also employed in this study. The increasing of pH from 2 to 11 did not influence the adsorption of PAHs on rGOs, whereas the suppressed adsorption of NAP on rGOs was observed both in the presence of HA and under high-temperature conditions. Adsorption isotherms of PAHs on rGOs were in accordance with the Polanyi-Dubinin-Ashtahhov (PDA) model, providing evidence that pore filling and flat surface adsorption were involved. The saturated adsorbed capacities (in mmolg(-1)) of rGOs for PAHs calculated from the PDA model significantly decreased in the order of NAP>PYR>ANT, which was comparable to the results of theoretical calculations. The pore-filling mechanism dominates the adsorption of NAP on rGOs, but the adsorption mechanisms of ANT and PYR on rGOs are flat surface adsorption.