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Nanofluidic transport through humic acid modified graphene oxide nanochannels†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-06-28 00:00:00 , DOI: 10.1039/c8qm00272j Tukhar Jyoti Konch 1, 2, 3, 4 , Raj Kumar Gogoi 1, 2, 3, 4 , Abhijit Gogoi 3, 4, 5, 6 , Kundan Saha 1, 2, 3, 4 , Jumi Deka 1, 2, 3, 4 , K. Anki Reddy 3, 4, 6, 7 , Kalyan Raidongia 1, 2, 3, 4
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-06-28 00:00:00 , DOI: 10.1039/c8qm00272j Tukhar Jyoti Konch 1, 2, 3, 4 , Raj Kumar Gogoi 1, 2, 3, 4 , Abhijit Gogoi 3, 4, 5, 6 , Kundan Saha 1, 2, 3, 4 , Jumi Deka 1, 2, 3, 4 , K. Anki Reddy 3, 4, 6, 7 , Kalyan Raidongia 1, 2, 3, 4
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The chemical similarity of graphene oxide (GO) and humic acid has been exploited to fine-tune the ionic and molecular transport properties of a lamellar GO membrane. Introduction of humic acid (in 10, 15 and 20%) is found to improve the nanofluidic transport characteristics, such as ionic mobility, molecular selectivity, diffusivity and permeability, of the GO membrane. Remarkably, the membrane prepared with 15% humic acid displayed superior proton mobility (μH = 1.04 × 10−4 cm2 V−1 s−1), in-plane diffusivity (D = 4.8 × 10−6 cm2 s−1), and cross-plane permeability (PL = 2.03 × 10−4 mm g cm−2 s−1 bar−1) to the pure GO and other composite membranes. The favorable nanofluidic characteristics of the 15% membrane are attributed to the larger effective heights of the 2D nanochannels, derived from the onset point of the surface charge governed ionic conductivity of the membranes. The activation energy of proton transport (∼0.07 to 0.1 eV) confirmed the occurrence of a Grotthuss-like hopping mechanism in all the GO–HA membranes. Introduction of humic acid into two-dimensional GO channels also improved the solution stability and mechanical robustness of the pristine GO membrane. The lamellar GO–HA membranes were also found to be suitable for energy harvesting applications such as direct methanol fuel cells and reverse electrodialysis. Remarkably, even after 72 hours exposure to electrolyte solutions, open circuit potentials up to 0.05 V, 0.21 V, and 0.12 V were found for the 10, 15, and 20% membranes, respectively.
中文翻译：
通过腐殖酸修饰的氧化石墨烯纳米通道的纳米流体传输†
已经利用氧化石墨烯（GO）和腐殖酸的化学相似性来微调层状GO膜的离子和分子传输特性。发现引入腐殖酸（分别为10％，15％和20％）可改善GO膜的纳米流体传输特性，例如离子迁移率，分子选择性，扩散率和渗透性。值得注意的是，该膜用15％腐殖酸制备显示优异的质子迁移率（μ ħ = 1.04×10 -4厘米2 V -1小号-1），在面内扩散率（d = 4.8×10 -6厘米2个小号-1）和跨平面磁导率（P L= 2.03×10 -4 mm g cm -2 s -1 bar -1）至纯GO和其他复合膜。15％膜的良好纳米流体特性归因于2D纳米通道的较大有效高度，该高度来自于表面电荷控制的膜的离子电导率的起始点。质子传输的活化能（约0.07至0.1 eV）证实了在所有GO-HA膜中都出现了格罗特斯式跳跃机制。将腐殖酸引入二维GO通道也提高了原始GO膜的溶液稳定性和机械强度。还发现片状GO–HA膜适用于能量收集应用，例如直接甲醇燃料电池和反向电渗析。值得注意的是，即使在暴露于电解质溶液72小时后，开路电势也高达0.05 V，0.21 V和0。
更新日期：2018-06-28
中文翻译：
通过腐殖酸修饰的氧化石墨烯纳米通道的纳米流体传输†
已经利用氧化石墨烯（GO）和腐殖酸的化学相似性来微调层状GO膜的离子和分子传输特性。发现引入腐殖酸（分别为10％，15％和20％）可改善GO膜的纳米流体传输特性，例如离子迁移率，分子选择性，扩散率和渗透性。值得注意的是，该膜用15％腐殖酸制备显示优异的质子迁移率（μ ħ = 1.04×10 -4厘米2 V -1小号-1），在面内扩散率（d = 4.8×10 -6厘米2个小号-1）和跨平面磁导率（P L= 2.03×10 -4 mm g cm -2 s -1 bar -1）至纯GO和其他复合膜。15％膜的良好纳米流体特性归因于2D纳米通道的较大有效高度，该高度来自于表面电荷控制的膜的离子电导率的起始点。质子传输的活化能（约0.07至0.1 eV）证实了在所有GO-HA膜中都出现了格罗特斯式跳跃机制。将腐殖酸引入二维GO通道也提高了原始GO膜的溶液稳定性和机械强度。还发现片状GO–HA膜适用于能量收集应用，例如直接甲醇燃料电池和反向电渗析。值得注意的是，即使在暴露于电解质溶液72小时后，开路电势也高达0.05 V，0.21 V和0。
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