Fabrication and application of composite adsorbents made by one-pot electrochemical exfoliation of graphite in surfactant ionic liquid/nanocellulose mixtures
Fabrication and application of composite adsorbents made by one-pot electrochemical exfoliation of graphite in surfactant ionic liquid/nanocellulose mixtures
复制标题
表面活性剂离子液体/纳米纤维素混合物中石墨一锅电化学剥离复合吸附剂的制备及应用
DOI：
10.1039/d1cp02206g
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发表时间：
2021
影响因子：
3.3
通讯作者：
Eastoe Julian
中科院分区：
文献类型：
--
作者：
Jamaluddin Nur Amirah;Mohamed Azmi;Bakar Suriani Abu;Ardyani Tretya;Sagisaka Masanobu;Saito Haruka;Mamat Mohamad Hafiz;Ahmad Mohd Khairul;Abdul Khalil H. P. S.;King Stephen M.;Rogers Sarah E.;Eastoe Julian
此前，表面活性剂辅助剥离氧化石墨烯（sEGO）由三链表面活性剂TC14（1,4-二（新戊基氧基）-3-（新戊基羰基）-1,4-二氧丁烷-2-磺酸钠）形成，用于废水处理。该三链表面活性剂形成的sEGO的脱染程度和吸附能力优于其他两种体系，即TC14的二链版本（AOT14; 1,2-二-（2,2-二甲基丙氧羰基）-乙磺酸钠）和单链表面活性剂n-十二烷基硫酸钠。本研究为进一步优化表面活性剂的化学结构，将TC14的钠离子用1-丁基-3-甲基咪唑（BMIM）取代，生成表面活性剂离子液体（SAILs； 1-丁基-3-咪唑1,4-双（新戊基氧基）-3-（新戊基氧基羰基）-1,4-二氧丁烷-2-磺酸盐），以下记为BMIM-TC14。该SAIL与纳米纤维化红麻纤维素（NFC）一起用于电化学剥离石墨，得到bmic - tc14 sEGO/NFC复合材料。然后将这些高度疏水的聚合物复合材料用于去除水溶液中的亚甲基蓝（MB）。利用核磁共振氢谱对合成的帆状膜进行了结构表征。利用拉曼光谱、场发射扫描电子显微镜和高分辨率透射电子显微镜研究了所得纳米复合材料的形貌。利用小角中子散射分析了sEGO和定制帆的聚集行为。Zeta电位、表面张力和动态光散射测量用于研究悬浮液的水性和胶体稳定性。在测试的表面活性剂中，bmi - tc14 sEGO/NFC表现出最高的MB吸附能力，在最佳条件下可达到99%的染料去除率。这些结果强调了修饰两亲性化合物的亲水部分以提高sEGO/NFC复合材料作为废水处理的有效吸附剂的重要性。
Previously, surfactant-assisted exfoliated graphene oxide (sEGO) formed with the triple-chain surfactant TC14 (sodium 1,4-bis(neopentyloxy)-3-(neopentylcarbonyl)-1,4-dioxobutane-2-sulfonate) was applied in wastewater treatment. The extent of dye-removal and the adsorption capacity of the sEGO formed with this triple-chain surfactant outperformed those of two other systems, namely, the di-chain version of TC14 (AOT14; sodium 1,2-bis-(2,2-dimethyl-propoxycarbonyl)-ethanesulfonate) and the single-chain surfactant sodium n-dodecylsulfate. In the present study, to further optimise the surfactant chemical structure, the sodium ion of TC14 was substituted with 1-butyl-3-methyl-imidazolium (BMIM) generating surfactant ionic liquids (SAILs; 1-butyl-3-imidazolium 1,4-bis(neopentyloxy)-3-(neopentyloxycarbonyl)-1,4-dioxobutane-2-sulfonate), hereafter denoted as BMIM-TC14. This SAIL, together with nanofibrillated kenaf cellulose (NFC), was used to electrochemically exfoliate graphite, yielding BMIM-TC14 sEGO/NFC composites. These highly hydrophobic polymer composites were then used for the removal of methylene blue (MB) from aqueous solution. 1H NMR spectroscopy was used to elucidate the structure of the synthesised SAILs. The morphologies of the resulting nanocomposites were investigated using Raman spectroscopy, field-emission scanning electron microscopy, and high-resolution transmission electron microscopy. Analysis using small-angle neutron scattering was performed to examine the aggregation behaviour of sEGO and custom-made SAILs. Zeta potential, surface tension, and dynamic light-scattering measurements were used to study the aqueous properties and colloidal stability of the suspension. Amongst the surfactants tested, BMIM-TC14 sEGO/NFC exhibited the highest MB adsorption ability, achieving 99% dye removal under optimum conditions. These results highlight the importance of modifying the hydrophilic moieties of amphiphilic compounds to improve the performance of sEGO/NFC composites as effective adsorbents for wastewater treatment.