Enhanced adsorption of hydrophobic organic contaminants by high surface area porous graphene
Enhanced adsorption of hydrophobic organic contaminants by high surface area porous graphene
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高表面积多孔石墨烯增强疏水性有机污染物的吸附
DOI：
10.1007/s11356-019-07439-2
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发表时间：
2019-12
影响因子：
5.8
通讯作者：
Ping Ning
中科院分区：
文献类型：
--
作者：
Lixuan Ma;Kai Li;Chi Wang;Bo Liu;Hongbo Peng;Yi Mei;Ping Ning
石墨烯纳米片（GNS）相对较低的表面积和微孔体积限制了其作为疏水性有机污染物（HOC）有效吸附剂的潜在应用。在本研究中，采用KOH蚀刻开发了活化GNS（K-GNS），用于吸附萘、苯酚、硝基苯和双酚A等模型HOC。活化后，K-GNS的比表面积（SSA）增加到885 m2/g，是GNS的三倍。 K-GNS的微孔体积大幅增加，C/O比增加了一倍。因此，这些HOCs在K-GNS上的吸附能力比原始GNS（P-GNS）大2-8倍。动力学数据采用准二阶模型拟合，HOCs在P-GNS和K-GNS上的吸附等温线采用Freundlich模型拟合。解吸研究表明 K-GNS 的释放速率低于 P-GNS。 P-GNS 和 K-GNS 对萘、苯酚、硝基苯和双酚 A 的高吸附主要由疏水性和 π-π 相互作用决定。此外，K-GNS与取代基之间的π-π EDA相互作用和氢键也不容忽视。
The relatively low surface area and micropore volume of graphene nanosheets (GNS) limit their potential application as effective adsorbents for hydrophobic organic contaminants (HOCs). In this study, KOH etching was used to develop activated GNS (K-GNS) for adsorption of model HOCs such as naphthalene, phenol, nitrobenzene, and bisphenol A. After activation, the specific surface area (SSA) of K-GNS increased to 885 m2/g, which was three times larger than that of GNS. The micropore volume of K-GNS substantially increased and the C/O ratio was doubled. Accordingly, the adsorption capacity of these HOCs on K-GNS was larger than that of pristine GNS (P-GNS) by 2–8 times. The kinetic data was fitted by the pseudo-second-order model, and the adsorption isotherms of HOCs on P-GNS and K-GNS were fitted by the Freundlich model. The desorption studies showed the K-GNS had a lower rate of release than P-GNS. The high adsorption of naphthalene, phenol, nitrobenzene, and bisphenol A on P-GNS and K-GNS is dominated by hydrophobic and π-π interactions. Additionally, the π-π EDA interaction and hydrogen bond between K-GNS and substituents cannot be ignored.
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