Revisit the Hydrated Cation−π Interaction at the Interface: A New View of Dynamics and Statistics

Yang, Yizhou; Liang, Shanshan; Wu, Hao; Shi, Guosheng; Fang, Haiping

doi:10.1021/acs.langmuir.1c03106

Cited by 7 publications

(5 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 5b, there appear peaks at 84.24 (4f7/2) and As shown in Figure 5a, several Bragg peaks appeared at various diffraction angles (2θ). The peak at ~24 • is from the rGO membranes [26], and the peaks at ~38.1 • , 44.4 • , 64.5 • and 77.5 • are close to the value of 2θ for the (111), ( 200), ( 220) and (311) surface of gold, respectively. To further verify the chemical state of Au 3+ ions on the membranes, we performed an XPS experiment.…”

Section: Characterizationmentioning

confidence: 55%

Thermally Reduced Graphene Oxide Membranes Revealed Selective Adsorption of Gold Ions from Mixed Ionic Solutions

Qiang,

Gao,

Zhang

et al. 2023

IJMS

Self Cite

View full text Add to dashboard Cite

The recovery of gold from water is an important research area. Recent reports have highlighted the ultrahigh capacity and selective extraction of gold from electronic waste using reduced graphene oxide (rGO). Here, we made a further attempt with the thermal rGO membranes and found that the thermal rGO membranes also had a similarly high adsorption efficiency (1.79 g gold per gram of rGO membranes at 1000 ppm). Furthermore, we paid special attention to the detailed selectivity between Au3+ and other ions by rGO membranes. The maximum adsorption capacity for Au3+ ions was about 16 times that of Cu2+ ions and 10 times that of Fe3+ ions in a mixture solution with equal proportions of Au3+/Cu2+ and Au3+/Fe3+. In a mixed-ion solution containing Au3+:Cu2+:Na+:Fe3+:Mg2+ of printed circuit board (PCB), the mass of Au3+:Cu2+:Na+:Fe3+:Mg2+ in rGO membranes is four orders of magnitude higher than the initial mass ratio. A theoretical analysis indicates that this selectivity may be attributed to the difference in the adsorption energy between the metal ions and the rGO membrane. The results are conducive to the usage of rGO membranes as adsorbents for Au capture from secondary metal resources in the industrial sector.

show abstract

Section: Characterizationmentioning

confidence: 55%

Thermally Reduced Graphene Oxide Membranes Revealed Selective Adsorption of Gold Ions from Mixed Ionic Solutions

Qiang,

Gao,

Zhang

et al. 2023

IJMS

Self Cite

View full text Add to dashboard Cite

show abstract

“…As reviewed recently by Jin et al [5], Zhang et al [6], and Geim [7], 2D Å-scale channels have become the attractive platforms for investigating mass transport under Å-scale confinement. Recently, graphenebased laminar membranes or devices composed of 2D Å-scale or nm-scale ion channels [8][9][10][11][12][13][14][15][16][17][18][19][20][21] have also become attractive platforms to mimic natural ion channels because they can provide not only ion dehydration effects [8,13,[15][16][17] but also cation-π interaction [18][19][20][21], as involved in biological ion channels [1,2,22,23].…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Graphene-Based Potassium Channels Built at an Oil/Water Interface

Wang

Yang

et al. 2023

Materials

View full text Add to dashboard Cite

Graphene-based laminar membranes exhibit remarkable ion sieving properties, but their monovalent ion selectivity is still low and much less than the natural ion channels. Inspired by the elementary structure/function relationships of biological ion channels embedded in biomembranes, a new strategy is proposed herein to mimic biological K+ channels by using the graphene laminar membrane (GLM) composed of two-dimensional (2D) angstrom(Å)-scale channels to support a simple model of semi-biomembrane, namely oil/water (O/W) interface. It is found that K+ is strongly preferred over Na+ and Li+ for transferring across the GLM-supported water/1,2-dichloroethane (W/DCE) interface within the same potential window (-0.1-0.6 V), although the monovalent ion selectivity of GLM under the aqueous solution is still low (K+/Na+~1.11 and K+/Li+~1.35). Moreover, the voltammetric responses corresponding to the ion transfer of NH4+ observed at the GLM-supported W/DCE interface also show that NH4+ can often pass through the biological K+ channels due to their comparable hydration–free energies and cation-π interactions. The underlying mechanism of as-observed K+ selective voltammetric responses is discussed and found to be consistent with the energy balance of cationic partial-dehydration (energetic costs) and cation-π interaction (energetic gains) as involved in biological K+ channels.

show abstract

“…Although Bansal et al found that large particles (~0.9 μm in diameter) were uniformly distributed, while small particles formed a ring on hydrophobic substrates with the contact angle >95° (i.e., polydimethylsiloxane and gas diffusion layer) [ 39 ], most researches indicate that this CRE-based separation method can only apply to suspensions with very low specimen fractions (<0.04 vol.%) [ 32 , 33 ] on sufficiently hydrophilic substrates [ 32 , 33 , 34 , 35 , 36 ]. Our previous work demonstrated that the CRE can be effectively controlled by simply adding trace amounts of salt to colloid suspensions [ 40 , 41 ]. It can be contributed to the enhanced adsorption between the particles and the aromatic substrate through strong hydrated cation-π interactions [ 42 , 43 , 44 , 45 ].…”

Section: Introductionmentioning

confidence: 99%

Size-Dependent Spontaneous Separation of Colloidal Particles in Sub-Microliter Suspension by Cations

Sheng

Yang²,

Song³

et al. 2022

IJMS

Self Cite

View full text Add to dashboard Cite

Great efforts have been made to separate micro/nanoparticles in small-volume specimens, but it is a challenge to achieve the simple, maneuverable and low-cost separation of sub-microliter suspension with large separation distances. By simply adding trace amounts of cations (Mg2+/Ca2+/Na+), we experimentally achieved the size-dependent spontaneous separation of colloidal particles in an evaporating droplet with a volume down to 0.2 μL. The separation distance was at a millimeter level, benefiting the subsequent processing of the specimen. Within only three separating cycles, the mass ratio between particles with diameters of 1.0 μm and 0.1 μm can be effectively increased to 13 times of its initial value. A theoretical analysis indicates that this spontaneous separation is attributed to the size-dependent adsorption between the colloidal particles and the aromatic substrate due to the strong hydrated cation-π interactions.

show abstract

Revisit the Hydrated Cation−π Interaction at the Interface: A New View of Dynamics and Statistics

Cited by 7 publications

References 68 publications

Thermally Reduced Graphene Oxide Membranes Revealed Selective Adsorption of Gold Ions from Mixed Ionic Solutions

Thermally Reduced Graphene Oxide Membranes Revealed Selective Adsorption of Gold Ions from Mixed Ionic Solutions

Two-Dimensional Graphene-Based Potassium Channels Built at an Oil/Water Interface

Size-Dependent Spontaneous Separation of Colloidal Particles in Sub-Microliter Suspension by Cations

Contact Info

Product

Resources

About