Comparison of Sorption to Carbon-Based Materials and Nanomaterials Using Inverse Liquid Chromatography.
Comparison of Sorption to Carbon-Based Materials and Nanomaterials Using Inverse Liquid Chromatography.
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DOI：
10.1021/acs.est.8b01653
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发表时间：
2018-08
影响因子：
11.4
通讯作者：
Florian Metzelder;Matin Funck;Thorsten Hüffer;T. Schmidt
中科院分区：
文献类型：
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作者：
Florian Metzelder;Matin Funck;Thorsten Hüffer;T. Schmidt
碳基材料和纳米材料的吸附研究通常使用批量实验进行，但弱吸附化合物的分析可能具有挑战性。柱色谱法是一种很有前途的补充，因为可以应用更高的吸附剂与溶液的比例。将吸附剂填充在柱中，并通过将吸附剂保留时间与非阻滞示踪剂的保留时间相关来计算吸附数据。在这项研究中，吸附的杂环有机化合物（吡唑，吡咯，呋喃和噻吩）的碳基材料（活性炭，生物炭和石墨）和纳米材料（功能化的碳纳米管和石墨烯片）进行了比较，首次使用柱色谱法。D2O被用作非延迟示踪剂。吸附等温线是非线性的，以及描述的Freundlich模型。在相似的浓度范围内，对于等温线，关于确定的Freundlich系数（Kf），材料之间的吸附作用不同，相差两个数量级以上。Kf与吸附剂的表面积的归一化显着降低，但没有消除吸附剂之间的差异。总的来说，柱色谱法代表了用单一实验方法研究弱吸附化合物对不同碳基吸附剂材料的吸附的机会，这在批量实验中是具有挑战性的，因为一些吸附剂材料的吸附性质非常不同。
Sorption studies of carbon-based materials and nanomaterials are typically conducted using batch experiments, but the analysis of weakly sorbing compounds may be challenging. Column chromatography represents a promising complement as higher sorbent to solution ratios can be applied. The sorbent is packed in a column, and sorption data are calculated by relating sorbate retention times to that of a nonretarded tracer. In this study, sorption of heterocyclic organic compounds (pyrazole, pyrrole, furan, and thiophene) by carbon-based materials (activated carbon, biochar, and graphite) and nanomaterials (functionalized carbon nanotubes and graphene platelets) was compared for the first time using column chromatography. D2O was used as nonretarded tracer. Sorption isotherms were nonlinear and described well by the Freundlich model. Sorption differed between the materials regarding determined Freundlich coefficients ( Kf) by more than two orders of magnitude for isotherms in a similar concentration range. Normalization of Kf with the surface area of the sorbent significantly reduced but did not remove the differences between the sorbents. Overall, column chromatography represents the opportunity to study sorption of weakly sorbing compounds to diverse carbon-based sorbent materials with a single experimental approach, which is challenging in batch experiments because of the very different sorption properties of some sorbent materials.