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胺功能化天然橡胶/介孔二氧化硅纳米复合材料在水相中吸附去除氯贝酸。

Amine-Functionalized Natural Rubber/Mesostructured Silica Nanocomposites for Adsorptive Removal of Clofibric Acid in Aqueous Phase.

机构信息

Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.

Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC), Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.

出版信息

Molecules. 2023 Mar 2;28(5):2330. doi: 10.3390/molecules28052330.

DOI:10.3390/molecules28052330
PMID:36903574
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10004768/
Abstract

This study is the first report on the synthesis, characterization and application of amine-functionalized mesoporous nanocomposites based on natural rubber (NR) and wormhole-like mesostructured silica (WMS). In comparison with amine-functionalized WMS (WMS-NH), a series of NR/WMS-NH composites were synthesized via an in situ sol-gel method in which the organo-amine group was grafted onto the nanocomposite surface via co-condensation with 3-aminopropyltrimethoxysilane (APS) as the amine-functional group precursor. The NR/WMS-NH materials had a high specific surface area (115-492 m g) and total pore volume (0.14-1.34 cm g) with uniform wormhole-like mesoporous frameworks. The amine concentration of NR/WMS-NH (0.43-1.84 mmol g) was increased with an increase in the APS concentration, corresponding to high levels of functionalization with the amine groups of 53-84%. The HO adsorption-desorption measurement revealed that NR/WMS-NH possessed higher hydrophobicity than WMS-NH. The removal of clofibric acid (CFA), a xenobiotic metabolite of the lipid-lowering drug clofibrate, from the aqueous solution using WMS-NH and NR/WMS-NH materials was investigated using a batch adsorption experiment. The adsorption was a chemical process in which the pseudo-second order kinetic model expressed the sorption kinetic data better than the pseudo first-order and Ritchie-second kinetic order model. In addition, the CFA adsorption sorption equilibrium data of the NR/WMS-NH materials were fitted to the Langmuir isotherm model. The NR/WMS-NH with 5% amine loading had the highest CFA adsorption capacity (6.29 mg g).

摘要

本研究首次报道了基于天然橡胶（NR）和虫孔状介孔硅（WMS）的胺功能化介孔纳米复合材料的合成、表征和应用。与胺功能化 WMS（WMS-NH）相比，通过原位溶胶-凝胶法合成了一系列 NR/WMS-NH 复合材料，其中有机胺基团通过与 3-氨丙基三甲氧基硅烷（APS）缩合接枝到纳米复合材料表面，作为胺功能基团前体。NR/WMS-NH 材料具有高比表面积（115-492 m2/g）和总孔体积（0.14-1.34 cm3/g），具有均匀的虫孔状介孔骨架。NR/WMS-NH 的胺浓度（0.43-1.84 mmol/g）随 APS 浓度的增加而增加，对应于胺基团的高官能化水平为 53-84%。HO 吸附-解吸测量表明，NR/WMS-NH 比 WMS-NH 具有更高的疏水性。使用 WMS-NH 和 NR/WMS-NH 材料通过批量吸附实验研究了从水溶液中去除降脂药物氯贝丁酸的外源性代谢物氯菲酸（CFA）。吸附是一种化学过程，其中拟二级动力学模型比拟一级和 Ritchie 二级动力学模型更好地表达了吸附动力学数据。此外，NR/WMS-NH 材料的 CFA 吸附平衡数据拟合 Langmuir 等温线模型。负载 5%胺的 NR/WMS-NH 具有最高的 CFA 吸附能力（6.29 mg/g）。

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