3D Graphene‐Based Macrostructures for Water Treatment

Wang, Haitao; Mi, Xueyue; Li, Yang; Zhan, Sihui

doi:10.1002/adma.201806843

Cited by 187 publications

(85 citation statements)

References 138 publications

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“…Freshwater supply is an intractable issue for a sustainable society, which is closely intertwined with energy crisis, [ 1 ] environment deterioration, [ 2 ] and health problems. [ 3 ] One approach to decoupling this nexus in a green way resorts to the utilization of solar energy.…”

Section: Figurementioning

confidence: 99%

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

Yang

Dong

et al. 2020

Advanced Materials

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absorbers have aroused great attention due to their resonant absorption and localized heating effect. [7][8][9] Nevertheless, this resonant absorption inherently features a narrow bandwidth, which is usually advantageous for applications such as biosensors [10] and resonant energy transfer, [11] but disadvantageous for broadband light absorption. [12,13] Some complex and delicate plasmonic metastructures were thus designed to hybridize proximate surface plasmons [12] or to support multiple resonances [13] in order to broaden the absorption bandwidth. However, the noble metals (i.e., Au and Ag) for plasmonic absorption along with the complicated fabrication procedures are undesirable for large-scale and full-spectrum (300-2500 nm) solar energy harvesting. [14] Zhou et al. creatively fabricated an all-aluminum hybrid plasmonic membrane, which was lowcost and enabled efficient broadband solar absorption. [15] The broadband plasmonic absorber was based on closely packed Al nanoparticles along the side walls of nanopores to induce a plasmon hybridization effect and high-density plasmonic resonances. [15] Among the several mechanisms that cause light absorption in metals, [16] interband transitions (IBTs) are single-electron excitations [17] from occupied levels in one band to unoccupied levels in another band, [18] in contrast to the collectively coherent excitation of electrons for plasmonic absorption. [19] IBTs intrinsically have a broadband attribute because photons the energy of which surpasses the interband threshold of a metal can excite IBTs. This makes IBTs very suitable for full-spectrum solar energy utilization, especially when massive IBTs over the entire solar spectrum can be supported by some transition metals (e.g., Ni, Pd, and Pt) with a high density of electronic states (DOS) near their Fermi levels. [20][21][22] In this work, we designed a Ni-cellulose hybrid metamaterial (NCM) that employs IBTs as the dominant optical absorption mechanism over the entire solar spectrum (Figures S1 and S2, and Note S1 for the detailed demonstration, Supporting Information). Nickel supports strong IBTs in very low energy regions (≈0.5 eV), which greatly increase optical absorption in the near-infrared spectrum compared to plasmonic metals (Au, Ag, and Cu). We densely embedded Ni nanoparticles into the nanogaps of cellulose microfibers via a seed-mediated and nanoconfined growth. This nanoconfinement effect can inhibit Sophisticated metastructures are usually required to broaden the inherently narrowband plasmonic absorption of light for applications such as solar desalination, photodetection, and thermoelectrics. Here, nonresonant nickel nanoparticles (diameters < 20 nm) are embedded into cellulose microfibers via a nanoconfinement effect, producing an intrinsically broadband metamaterial with 97.1% solar-weighted absorption. Interband transitions rather than plasmonic resonance dominate the optical absorption throughout the solar spectrum due to a high density of electronic states near the Fermi level of nickel. Fiel...

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Section: Figurementioning

confidence: 99%

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

Yang

Dong

et al. 2020

Advanced Materials

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“…These results evidence the presence of oxygen-containing functional groups (i.e., hydroxyl, epoxide, carbonyl, and carboxyl dominant groups [56]) attached to the basal plane or at the edges of the graphene structure [57] even when its surface area begins to recover. This chemical feature is a crucial result from the point of view of the removal of organics pollutants, because three main characteristics are needed in graphene to treat dyes, such as MB: large π interactions, electronegativity, and large specific surface area [7].…”

Section: Transformation Of Go Into Rgomentioning

confidence: 99%

The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide

et al. 2020

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Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to describe the adsorption kinetics of MB onto rGO, suggesting an equilibrium time of 30 min. Otherwise, the Langmuir model was more suitable to describe the adsorption isotherms, indicating a maximum adsorption capacity of 121.95 mg g−1 at 298 K. In addition, kinetics and thermodynamic analyses demonstrated that the adsorption of MB onto rGO can be treated as a mixed physisorption–chemisorption process described by H-bonding, electrostatic, and π − π interactions. These results show the potential of green-prepared rGO to remove cationic dyes from wastewater systems.

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“…In the field of CDI electrodes, carbon is one of the best choices for the development and manufacture of porous electrodes . Among them, graphene, as a new member of the “carbon family,” has become a research focus in CDI electrodes . Graphene is characterized in that almost all of its surface areas are available.…”

Section: Introductionmentioning

confidence: 99%

“…15 Among them, graphene, as a new member of the "carbon family," has become a research focus in CDI electrodes. [16][17][18][19][20][21][22] Graphene is characterized in that almost all of its surface areas are available. We note that in addition to the intrinsic properties of graphene, other factors such as graphene electrode thickness, spatial structure, cell structure design, and operational settings also have a significant impact on CDI performance.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐doped self‐shrinking porous 3D graphene capacitor deionization electrode

Qian

Duan

Gong³

2019

Int J Energy Res

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Summary Traditional three‐dimensional (3D) graphene has a large pore structure, which makes the graphene structure not well interact with the anion and cation during the desalination process, thereby restricting the capacitive deionization (CDI) ability of the 3D graphene. In this work, we prepared a nitrogen‐doped self‐shrinking porous 3D graphene electrode by adding a pyrrole monomer to a graphene oxide solution, which was then applied to a CDI electrode. The results show that the electrochemical performance of the as‐prepared nitrogen‐doped self‐shrinking porous 3D graphene (NSPG) is significantly improved. Compared with traditional 3D graphene, NSPG has a denser pore structure with a larger specific surface area, thus exhibiting a good CDI performance: The NSPG electrode has an electroadsorption capacity of 13.16 mg/g.

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3D Graphene‐Based Macrostructures for Water Treatment

Cited by 187 publications

References 138 publications

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

A Scalable Nickel–Cellulose Hybrid Metamaterial with Broadband Light Absorption for Efficient Solar Distillation

The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide

Nitrogen‐doped self‐shrinking porous 3D graphene capacitor deionization electrode

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