Effect of surface chemistry on the uptake of lignin-derived aromatic molecules on ordered mesoporous silica
Effect of surface chemistry on the uptake of lignin-derived aromatic molecules on ordered mesoporous silica
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DOI：
10.1016/j.micromeso.2020.110809
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发表时间：
2020-12
影响因子：
5.2
通讯作者：
P. Miller;E.J. Burgess;Aibolat Koishybay;D. Shantz
中科院分区：
文献类型：
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作者：
P. Miller;E.J. Burgess;Aibolat Koishybay;D. Shantz
合成、表征了一系列功能化有序介孔二氧化硅（OMS）材料，并测试了它们从稀水溶液中吸收木质素衍生分子（例如愈创木酚）的能力。一个关键的观察结果是，用疏水基团功能化的 OMS 材料具有适度的愈创木酚吸收量 (<0.5 mmol/g)，与聚（苯乙烯-二乙烯基苯）的观察结果类似。接触角测量表明，在润湿性方面具有中等疏水性（60 至 100° 之间）的样品表现出优异的吸收特性。 Oasis HLB 是此类材料的一个例子，与制备的 MCM-41 一样，表现出更高的愈创木酚吸收量 (0.8 mmol/g)，其中 CTAB 留在孔中 (AM-MCM-41，0.7 mmol/g)。合成并测试了具有一系列表面化学性质的扩孔 FDU-12，以生成 AM-MCM-41 的共价接枝类似物，但没有一种材料显示出高于 0.35 mmol/g 的吸收量。最后，其他芳香族分子，如香草醛、儿茶酚、连苯三酚也比 Oasis HLB 和 AM-MCM-41 表现出更高的吸收率（0.4 mmol/g 或更高）。这些发现提出了设计可以选择性地从稀水溶液中去除木质素衍生物的混合材料的新途径。
A series of functionalized ordered mesoporous silica (OMS) materials were synthesized, characterized, and tested for their ability to uptake lignin-derived molecules such as guaiacol from dilute aqueous solution. A key observation was that OMS materials functionalized with hydrophobic groups have modest guaiacol uptake (<0.5 mmol/g), similar to what was observed with poly(styrene-co-divinylbenzene). Contact angle measurements show that samples with intermediate hydrophobicity in terms of wetting (between 60 and 100°) display superior uptake properties. Oasis HLB, an example of such a material displays higher guaiacol uptake (0.8 mmol/g) as does as-made MCM-41, wherein the CTAB is left in the pores (AM-MCM-41, 0.7 mmol/g). Pore-expanded FDU-12 with a range of surface chemistries was synthesized and tested in an effort to generate a covalently grafted analogue of AM-MCM-41, however none of the materials showed uptakes above 0.35 mmol/g. Finally, other aromatic molecules such as vanillin, catechol, pyrogallol also showed high uptake (0.4 mmol/g or high) over Oasis HLB and AM-MCM-41. The findings suggest new routes for designing hybrid materials that can selectively remove lignin derivatives from dilute aqueous solutions.