Sorption mechanisms of organic compounds by carbonaceous materials: site energy distribution consideration.
Sorption mechanisms of organic compounds by carbonaceous materials: site energy distribution consideration.
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DOI：
10.1021/es506034e
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发表时间：
2015-04
影响因子：
11.4
通讯作者：
Xiaofang Shen;Xiaoying Guo;Meng Zhang-;S. Tao;Xilong Wang
中科院分区：
文献类型：
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作者：
Xiaofang Shen;Xiaoying Guo;Meng Zhang-;S. Tao;Xilong Wang
研究了4种石墨烯、3种石墨、2种碳纳米管和1种介孔碳等10种碳质材料对萘、林丹和阿特拉津的吸附性能。基于Dubininin-Ashtakhov（DA）模型计算了吸附位能量分布。推导了平均吸附位能和位能分布的标准差，并用于分析吸附剂和吸附剂之间的相互作用以及吸附位的异质性。含氧官能团的吸附剂的引入导致其平均吸附能的研究化合物的减少。然而，相对于平均位点能量的降低，如表面积所示的吸附位点数量的减少更强烈地降低了它们对基于线性回归分析的结果的测试的含碳材料的吸附能力。吸附剂的吸附位点的不均匀性降低，因为它们的氧含量的增加，这是由于更好的分散的含氧材料所示的TEM图像。本研究提出的方法来量化的平均吸附位能和异质性，有助于更好地理解有机污染物的吸附机制的碳材料。
Sorption of naphthalene, lindane, and atrazine on 10 kinds of carbonaceous materials which included four kinds of graphene, three kinds of graphite, two kinds of carbon nanotubes and one kind of mesoporous carbon was investigated. The approximate sorption site energy distributions were calculated based on Dubinin-Ashtakhov (DA) model. The average sorption site energy and standard deviation of the site energy distribution were deduced and applied to analyze the interaction between sorbents and sorbates, and the sorption site heterogeneity. The introduction of oxygen-containing functional groups to the sorbents caused a decrease in their average sorption energy for the studied compounds. However, relative to the decrease in average site energy, the reduction in number of sorption sites as indicated by surface area more strongly reduced their sorption capacity to the tested carbonaceous materials based on the result of the linear regression analysis. Sorption site heterogeneity of the sorbents decreased as their oxygen contents increased, which is attributed to the better dispersion of the oxygen-containing materials as indicated by their TEM images. The method proposed in this study to quantify the average sorption site energy and heterogeneity is helpful for a better understanding of the sorption mechanisms of organic pollutants to carbonaceous materials.