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Textured propyl gallate modified MXene biopaster with prolonged photothermal effect for in-situ post-surgery residual tumor clearance
No full textResidual tumors after surgery lead to a high risk of recurrence, and effective strategies clearing the residual tumors urgently need to be developed. Locally administering antitumor agents after surgery has been proved effective to clear residual tumor cells, but achieving long-lasting efficacy and repeatable treatment are still challenges for these agents. In this study, we orderly arranged propyl gallate (PG)-grafting MXene onto calcium-alginate hydrogel (CA) layer to develop a photothermal-responsive biopaster for the tumor post-surgery recurrence prevention. The order arrangement of PG-grafting MXene nanosheets with the prolonged degradation time (compared to the non-PG-grafting ones) could retain the photothermal responsiveness for 14 days. Therefore, this biopaster provided long-term photothermal therapeutic capability to kill the residual tumors and effectively prevented the tumor recurrence (after surgery). This work provides references for designing NIR-responsive 2D nanomaterials with enhanced NIR-responsiveness and long-term antitumor efficacy. (C) 2022 Elsevier Ltd. All rights reserved
Sustainable alternative cathodes of sodium-ion batteries using hybrid P2/ O3 phase Na0.67Fe0.5Mn0.5-xMgxO2
No full textThe Na(0.67)Fe(0.5)Mn(0.5-x)Mg(x)O(2)compound with x = 0.02, 0.04, 0.06, 0.08, 0.1, 0.15 was synthesized by solid state reaction. The structure of the samples gradually transformed from P2 phase to O3 phase with the increase of Mg content. The hybrid P2/O3 phase transition metal oxides with high performance was pre-pared to promote the application of sodium-ion batteries. Na(0.67)Fe(0.5)Mn(0.5-x)Mg(x)O(2)exhibited a hybrid P2/ O3 phase structure, which showed high electrochemical performance. Due to the synergy of P2 and O3 phase, the conductivity for the migration of Na ions in the experimental cell, exhibited the highest ion diffusivity. Here, Fe and Mn-based transition metal oxide materials as a cathode material can have great application potential for sodium-ion batteries and can be one of the most promising alternatives to the limited lithium-ion battery.(c) 2022 Elsevier B.V. All rights reserved
Two-dimensional Na-Bentonite@MXene composite membrane with switchable wettability for selective oil/water separation
No full textMXene-based two-dimensional (2D) material membranes have attracted an increasing number of attentions in the field of separation and purification. However, the easily oil-pollution of MXene membrane still limit its further application for oil/water separation. In this work, Na-Bentonite was embedded into MXene nanosheets and then a series of Na-Bentonite@MXene (NBM) composite membranes were prepared by one-step hydro -thermal pretreatment and vacuum self-assembly on polyvinylidene fluoride membrane surface. The modified composite membranes exhibited excellent separation performances with a rejection ratio above 96 % and a flux recovery rate (FRR) higher than 86 % after 8 cycling tests for oil/water emulsion. In addition, the sandwich structure consisting of MXene nanosheets and Na-Bentonite could not only play a positive role in the stability of composite membrane, but also formed a special micro-nano structure on membrane surface, resulting in a switchable wettability of composite membrane. When the membrane surface was pretreated with water or oil, it presented hydrophilic/hydrophobic or hydrophobic/oleophilic surfaces, respectively, which realized the effec-tive separation for different components in oil/water emulsion. This work provides a new method for the design and construction of MXene-based 2D membrane with continuous anti-fouling capacity, which shows a great application potential in the treatment of oily wastewater
Research Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection[SKLGP2020Z002]
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Non-photosynthetic chemoautotrophic CO2 assimilation microorganisms carbon fixation efficiency and control factors in deep-sea hydrothermal vent
No full textNon-photosynthetic chemoautotrophic microorganisms in deep-sea hydrothermal vent can obtain energy by oxidation reducing substances and synthesize CO2 into organic carbon, and the development and utilization of microbial re-sources in this environment for CO2 fixation under ordinary environmental conditions is of great significance to under-stand the carbon cycle and microbial carbon fixation in deep-sea hydrothermal vent. In this study, a set of spiral-stirred bioreactor (SSB) was developed to cultivate a group of non-photosynthetic chemoautotrophic CO2 assimilation micro-organisms (NPCAM), mainly Sphingomonadaceae (unclassified, the mean of which was 31.16 %), from deep-sea hydro -thermal vent sediments, which have the characteristics of halophilic, acid-base and heavy metal resistant. The maximum carbon fixation efficiency (calculated by CO2) was 6.209 mg center dot CO2/(L center dot h) after 96 h of incubation in the presence of mixed electron donors (MEDs, 0.46 % NaNO2, 0.50 % Na2S2O3 and 1.25 % Na2S, w/v), mixed inorganic carbon sources (CO2, Na2CO3 and NaHCO3) and aerobic conditions. The detection of NPCAM synthetic organic frac-tion in SSB system, the study of single bacteria culturability and carbon fixation efficiency, the analysis of CO2 fixation pathway and the development of coupled carbon fixation technology are the prospective works that need to be further developed