Environmental Conditions Influencing Sorption of Inorganic Anions to Multiwalled Carbon Nanotubes Studied by Column Chromatography.
Environmental Conditions Influencing Sorption of Inorganic Anions to Multiwalled Carbon Nanotubes Studied by Column Chromatography.
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DOI：
10.1021/acs.est.6b06386
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发表时间：
2017-04
影响因子：
11.4
通讯作者：
Florian Metzelder;T. Schmidt
中科院分区：
文献类型：
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作者：
Florian Metzelder;T. Schmidt
碳基纳米材料的吸附通常在批量实验中进行研究。另一种研究吸附的方法是柱色谱法。吸附剂填充柱和吸附数据是通过相关的山梨酸盐保留的一个nonretarded示踪剂。我们现在第一次应用这种技术来研究环境条件对多壁碳纳米管吸附无机阴离子（溴化物，亚硝酸盐，硝酸盐和碘化物）的影响。氧化氘被用作非延迟示踪剂。吸附等温线的Freundlich模型最好的描述。吸附增加的顺序溴4.5的表面电荷是负的，但吸附仍然是可检测的pH值为6和9。因此，除静电吸引力外，其他力也有助于吸附。这些力可以包括H-键合，如通过柱温变化确定的吸附焓所示。总的来说，柱色谱法在吸附研究中是一种很有前途的替代方法，可以揭示吸附剂的性质。
Sorption to carbon-based nanomaterials is typically studied in batch experiments. An alternative method offering advantages to study sorption is column chromatography. Sorbent packed columns are used and sorption data are determined by relating sorbate retention to that of a nonretarded tracer. We have now for the first time applied this technique to study the influence of environmental conditions on sorption of inorganic anions (bromide, nitrite, nitrate, and iodide) to multiwalled carbon nanotubes. Deuterium oxide was used as nonretarded tracer. Sorption isotherms were best described by the Freundlich model. Sorption increased in the order bromide 4.5 the surface charge was negative, but sorption was still detectable at pH 6 and 9. Consequently, other forces than electrostatic attraction contributed to sorption. These forces may include H-bonding as indicated by sorption enthalpy determined by variation of column temperature. Overall, column chromatography represents a promising alternative in sorption studies to reveal sorbent properties.