[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

MXenes have attracted great interests as supercapacitors due to their metallic conductivity, high density, and hydrophilic nature. Herein we report Ti3 C2 -Cu/Co hybrids via molten salt etching in which the existence of metal atoms and their interactions with MXene via surficial O atoms were elucidated by XAFS for the first time. The electrochemical investigation of Ti3 C2 -Cu electrode demonstrated the pseudocapacitive contribution of Cu and a splendid specific capacitance of 885.0 F g-1 at 0.5 A g-1 in 1.0 M H2 SO4 . Symmetric supercapacitor Ti3 C2 -Cu//Ti3 C2 -Cu was demonstrated with operating voltage of 1.6 V, areal capacitance of 290.5 mF cm-2 at 1 mA cm-2 , and stability over 10 000 cycles. It delivered an areal energy density of 103.3 μWh cm-2 at power density of 0.8 mW cm-2 , based on which a supercapacitor pouch was fabricated. It provides deeper insights into the molten salt mechanism and strategies for designing MXene-based materials for electrochemical energy storage.

MXene-Copper/Cobalt Hybrids via Lewis Acidic Molten Salts Etching for High Performance Symmetric Supercapacitors.

New families of materials that may potentially replace dominant carbon electrodes have emerged as a major research hotspot in the field of capacitive deionization (CDI). Here, we report a metal–organic framework (MOF)/polypyrrole (PPy) hybrid, in which conductive PPy nanotubes that are running through each MOF particle have the potential to increase the overall bulk electrical conductivity, thus promoting such a system as a good CDI electrode material. Consequently, the MOF/PPy hybrid shows a high desalination capacity of 11.34 mg g−1, which is amongst those of state-of-the-art CDI electrodes. Moreover, the MOF/PPy hybrid also shows a superior desalination performance for brackish water and good cycling stability, far exceeding typical carbon-based benchmarks. This is the first example of CDI electrodes derived from direct MOF-based materials, highlighting the potential of these hybrid systems as promising materials beyond traditional carbon electrodes.

Nanoarchitectured metal–organic framework/polypyrrole hybrids for brackish water desalination using capacitive deionization

Alternative water resources (seawater, brackish water, atmospheric water, sewage, etc.) can be converted into clean freshwater via high-efficiency, energy-saving, and cost-effective methods to cope with the global water crisis. Herein, we provide a comprehensive and systematic overview of various solar-powered technologies for alternative water utilization (i.e., "sunlight-energy-water nexus"), including solar-thermal interface desalination (STID), solar-thermal membrane desalination (STMD), solar-driven electrochemical desalination (SED), and solar-thermal atmospheric water harvesting (ST-AWH). Three strategies have been proposed for improving the evaporation rate of STID systems above the theoretical limit and designing all-weather or all-day operating STID systems by analyzing the energy transfer of the evaporation and condensation processes caused by solar-thermal conversion. This review also introduces the fundamental principles and current research hotspots of two other solar-driven seawater or brackish water desalination technologies (STMD and SED) in detail. In addition, we also cover ST-AWH and other solar-powered technologies in terms of technology design, materials evolution, device assembly, etc. Finally, we summarize the content of this comprehensive review and discuss the challenges and future outlook of different types of solar-powered alternative water utilization technologies.

Solar-Powered Sustainable Water Production: State-of-the-Art Technologies for Sunlight-Energy-Water Nexus.

Advanced oxidation processes (AOPs) based wastewater treatment - unexpected nitration side reactions - a serious environmental issue: A review

The invention relates to a graphene stripping device based on a cyclone gradient shear flow field. The device comprises a stator and a rotor, wherein a cavity is formed in the stator, a feeding pipeline is arranged at the outer side of the upper end of the stator, and a discharge pipeline is arranged in the middle of the lower end of the stator; the rotor is arranged in the closed cavity of the stator, and the upper end of the rotor is provided with a rotating shaft; the rotating shaft is installed on the stator and is connected with a transmission device; the cavitation blind holes are evenlydistributed in the inner wall of the cavity of the stator and the rotor. The rotor rotates at a high speed, and cavitation is generated by means of the cavitation blind holes; by using high shear andcavitation effects, graphite particles are enriched in an outer sleeve layer under the action of a swirling centrifugal force field, so that the collision between the particles is enhanced. By meansof multiple superpositions, the van der waals force between graphene sheets in the graphite particles can be more effectively overcome, so that the graphene is effectively stripped, and the preparation efficiency of the graphene is greatly improved. The graphene stripping device utilizes the cyclone gradient shear flow field to enable the graphite particles to be sheared in a way of being parallelto the shear plane; the stripped graphene flows out of the device along with liquid, so that the damage to the large-area graphene is avoided.

Graphene stripping device based on cyclone gradient shear flow field

https://doi.org/10.1016/j.ultsonch.2023.106350

Hydrodynamic cavitation coupled with zero-valent iron produces radical sulfate radicals by sulfite activation to degrade direct red 83

Ternary heterojunction photocatalysts can improve the transport and separation of photogenerated electrons and holes, which could promote their reduction and oxidation properties for environmental and energy applications. In this research, the ternary photocatalyst Ti3C2@TiO2/g-C3N4 was successfully synthesized via direct electrostatic self-assembly during hydrothermal process. Ti3C2 MXene was used to optimize the interfacial carrier transport and separation between the interfaces. The obtained ternary heterostructured photocatalyst had a higher photocatalytic degradation performance for removing rhodamine B (RhB) and 4-chlorophenol (4-CP). The synergistic effect of heterojunction between g-C3N4 and TiO2 and Schottky barrier presented among TiO2 and Ti3C2 suppressed the recombination of the photogenerated electron–hole pairs. Moreover, the Ti3C2 can serve as an active site for the adsorption and activation of organic pollutants resulting from sufficient functional groups (F− here).

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Ti3C2@g-C3N4/TiO2 Ternary Heterogeneous Photocatalyst for Promoted Photocatalytic Degradation Activities

The invention discloses a high-flux liquid-liquid extraction microfluidic device and an extraction method thereof. The high-flux liquid-liquid extraction microfluidic device comprises a water phase inlet liquid collecting cavity, an oil phase inlet liquid collecting cavity, a water phase outlet liquid collecting cavity, an oil phase outlet liquid collecting cavity, a water phase inlet micro-channel, an oil phase inlet micro-channel, a contact extraction micro-channel, a water phase outlet micro-channel and an oil phase outlet micro-channel; the water phase inlet micro-channel and the oil-phaseinlet micro-channel are connected with one end of the contact extraction micro-channel, and the other end of the contact extraction micro-channel is connected with the water phase outlet micro-channel and the oil phase outlet micro-channel; and the other ends of the water phase inlet micro-channel, the oil phase inlet micro-channel, the water phase outlet micro-channel and the oil phase outlet micro-channel are respectively connected with the water phase inlet liquid collecting cavity, the oil phase inlet liquid collecting cavity, the water phase outlet liquid collecting cavity and the oil phase outlet liquid collecting cavity. The extraction method of the high-flux liquid-liquid extraction microfluidic device comprises co-extraction and reverse extraction. By using the high-flux liquid-liquid extraction microfluidic device and the extraction method thereof, a sample solution and an extractant can be continuously introduced and stably conveyed, the fluid contact area and the extraction efficiency are increased, and the high-flux liquid-liquid extraction microfluidic device and the extraction method thereof are suitable for extracting a plurality of metal ions.

Xun Sun

Papers

Graphene stripping device based on cyclone gradient shear flow field

Hydrodynamic cavitation coupled with zero-valent iron produces radical sulfate radicals by sulfite activation to degrade direct red 83

Ti3C2@g-C3N4/TiO2 Ternary Heterogeneous Photocatalyst for Promoted Photocatalytic Degradation Activities

High-flux liquid-liquid extraction microfluidic device and extraction method thereof

The impact of cylinder vortex stabilizer on fluctuating turbulence characteristics of a cyclone separator based on Large Eddy Simulation