Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Yan Zishuo,Liu Xiaoyan,Ding Bin,Yu Jianyong,Si Yang
Chemical warfare agents (CWAs) significantly threaten human peace and global security. Most personal protective equipment (PPE) deployed to prevent exposure to CWAs is generally devoid of self-detoxifying activity. Here we report the spatial rearrangement of metal-organic frameworks (MOFs) into superelastic lamellar-structured aerogels based on a ceramic network-assisted interfacial engineering protocol. The optimized aerogels exhibit efficient adsorption and decomposition performance against CWAs either in liquid or aerosol forms (half-life of 5.29 min, dynamic breakthrough extent of 400 L g −1 ) due to the preserved MOF structure, van-der-Waals barrier channels, minimized diffusion resistance (~41% reduction), and stability over a thousand compressions. The successful construction of the attractive materials offers fascinating perspectives on the development of field-deployable, real-time detoxifying, and structurally adaptable PPE that could be served as outdoor emergency life-saving devices against CWAs threats. This work also provides a guiding toolbox for incorporating other critical adsorbents into the accessible 3D matrix with enhanced gas transport properties.
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Carbon Letters
·
2023
·Vol. 33
·期 4
·1205-1215
·
IF 4.5
Yang Mannan,Fang Changqing,Su Jian,Zeng Huilin,Lin Qilang
In this study, waste corrugated paper was used as carbon precursor with KOH-NaOH mixture (mole ratio was 51:49 and the melting point is 170 °C) as activator to prepare porous carbon at different reaction temperature and different mass ratio of KOH-NaOH mixture/waste corrugate paper fiber. The micro-morphology, pore structure information and composition of porous carbon were analyzed, and the formation mechanism of pores was investigated. The effect of activator amount and pyrolysis temperature on the morphology and structure of porous carbon were studied. The adsorption capacity of porous carbon was evaluated with the methylene blue as model pollutant. The effect of adsorbent amount, adsorption time and temperature on the adsorption performance of the porous carbon were analyzed. The maximum specific surface area is 1493.30 m 2 ·g −1 and the maximum adsorption capacity of methylene blue is 518 mg·g −1 . This study provides a new idea for efficient conversion and utilization of waste paper. Graphical abstract
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Nano Research
·
2023
·Vol. 16
·期 5
·6278-6289
·
IF 9.9
Xu Jialun,Zhang Zhihua,Yu Daiyi,Du Wei,Song Nan,Duan Xuezhi,Zhou Xinggui
The catalytic performances over propylene epoxidation with H 2 and O 2 (HOPO process) are significantly affected by the properties (e.g., surface properties, Ti coordination, and morphology) of titanosilicate zeolite. Introducing urea into zeolite synthesis is a simple and convenient method to modify these properties of titanosilicate zeolite. Uncalcined pore-blocked titanium silicalite-1 (TS-1, i.e., TS-1-B) with the lower urea dosage possesses more defective structure and unsaturated coordinated Ti sites verified by 29 Si nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) analysis, which results in a high initial activity and hydrogen efficiency; while the high surface acidity generated by these Ti species leads to a continuous decrease in the activity and the propylene oxide (PO) selectivity during the reaction. As the amount of urea gradually increases, the TS-1-B samples present the reduced surface defects and defective and unsaturated Ti species. Specially, TS-1-B-0.30U presents the weaker PO adsorption on PO-diffusion reflectance infrared Fourier transform spectra (DRIFTS), and thus results in the high stable PO formation rate and selectivity over its Au catalyst. Furthermore, a flat-plate-like shape with a shorter thickness of 100 nm along the b-axis direction is observed on the urea-modified TS-1. Compared with the conventional ellipsoidal TS-1 with crystal sizes of 200 and 500 nm, the flat-plate-like TS-1-0.30U displays the less surface defects, unsaturated Ti species, and the weaker Lewis acid, which is favorable for the desorption and intracrystalline diffusion of PO, thus reduces the occurrence of side reactions for the improved selectivity and stability. This work may provide a reference for developing titanium-containing materials with high activity and stability over HOPO reaction.
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Nano Research
·
2023
·Vol. 16
·期 7
·8937-8944
·
IF 9.9
Zhang Ruijie,Sun Yajing,Jiao Fei,Li Lin,Geng Dechao,Hu Wenping
As a new paradigm of material science, two-dimensional (2D) heterostructured composites have attracted extensive interests because of combining the collective advantages and collaborative characteristics of individual building blocks. Molybdenum disulfide (MoS 2 ) has demonstrated great promise as a low-cost substitute to platinum-based catalysts for electrochemical hydrogen production. However, the broad adoption of MoS 2 is hindered by its limited number of active sites and low inherent electrical conductivity. One of the promising methods to further activate MoS 2 is coupling engineering. Here, we demonstrate for the first time the synthesis of 2D MXene-MoS 2 nanocomposites through chemical vapor deposition (CVD) approach, thus leading to precise design in structure type and orientation. The computational results show that nanocomposites have metallic properties. Owing to their unique 2D/2D structure, MXene-MoS 2 nanocomposites exhibit more active catalytic sites, resulting in higher electrochemical performance, as inherited from parent excellent characteristics, and a much lower overpotential of ∼ 69 mV at a current density of 10 mA·cm −2 is achieved. This work paves the way to employ CVD method by coupling engineering to construct 2D nanocomposites for energy storage applications.
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RARE METALS
·
2023
·Vol. 42
·期 6
·1969-1982
·
IF 8.8
Liao Jia-Lin,Zhang Shuai,Bai Tian-Sheng,Ji Feng-Jun,Li De-Ping,Cheng Jun,Zhang Hong-Qiang,Lu Jing-Yu,Gao Quan,Ci Li-Jie
Lithium metal batteries (LMBs) with a high theoretical capacity are seen as a type of the most potential energy storage system. Unfortunately, the growth of lithium dendrite, the irreversible side reactions, and the infinite volume alteration still curb the practical utilization of lithium metal anodes, resulting in low Coulombic efficiency (CE) and safety problems, etc. Herein, we synthesize a lithiophilic 3D copper foam host with uniformly distributed nano-flower-like ZnO particles (CuF/ZnO) and obtain the composite lithium metal anode containing the Li 2 O, LiZn alloy, and pure Li by the infusion of molten Li (CuF/Li 2 O-LiZn@Li). Benefitting from the advantages of the 3D structure of copper foam and the lithiophilicity of ZnO sites, the composite lithium metal anode can restrain the volume alternation and regulate the uniform deposition of lithium. The symmetrical cells of the composite lithium metal anode have a 1600 h long cycle life with a low polarization voltage of 15 mV, and the Coulombic efficiency can maintain about 97.8% at 1.0 mA·cm −2 , 1.0 mAh·cm −2 . Graphical abstract
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 2
·771-778
·
IF 2.5
Li Mengmeng,Xu Qiuyu,Jiang Wei,Farooq Amjad,Qi Yirui,Liu Lifang
Herein, Fe 3 O 4 nanoparticles and graphene oxide (GO) are compounded first, followed by the addition of cellulose nanofiber (CNF) and l -ascorbic acid, to obtain Fe 3 O 4 @reduced graphene oxide (rGO)/CNF foams via the freeze-drying method. The electrical conductivity and magnetism of as-prepared foams were improved due to the presence of rGO and Fe 3 O 4 , which is suitable for electromagnetic interference (EMI) shielding material. The results exhibit that Fe 3 O 4 @rGO/CNF foams all possess a porous structure, and the optimized foam shows an EMI shielding effectiveness value of ~ 23 dB in the X-band. The good EMI shielding performance of the Fe 3 O 4 @rGO/CNF foam originates from the synergy of its composition and structure. This work could provide a reference for the design and fabrication of novel EMI shielding materials.
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MACROMOLECULAR RESEARCH
·
2023
·Vol. 31
·期 3
·233-243
·
IF 2.4
Liu Peng,Bai Xiaoyu,Gao Xingtong,Liu Kai,Li Aixiang,Lyu Zijian,Li Qiuhong
In this paper, lutein block polyethylene glycol (lutein-b-PEG) copolymers were synthesized by hydrophilic modification of lutein with carboxylated polyethylene glycol (CT-PEG). The unreacted lutein was loaded into micelles formed by self-assembly of block copolymers to prepare composite nanoparticles. The results of FT-IR, 1 H NMR, gel permeation chromatography (GPC), UV–vis and critical micellar concentration (CMC) showed that the double terminal carboxyl group ratio of CT-PEG reached 50.31%, and lutein-b-PEG was successfully synthesized without destroying the structure of lutein. Compared with lutein, the retention rate of lutein composite nanoparticles increased from 4.32 to 81.3% after 30 days of storage in the dark. In addition, the saturation solubility and bioaccessibility of lutein nanoparticles were increased 35 times and 5.2 times, respectively, due to micellar formation and improved water solubility. These findings indicated that the lutein composite nanoparticles modified with PEG significantly improved the chemical stability, water solubility, and bioaccessibility of lutein.
Graphical abstract
Preparation and properties of lutein block polyethylene glycol copolymer loading with lutein nanoparticles
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ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 6
·935-943
·
IF 1.6
Wang Jingyu,Cui Yunyi,Lin Ying,He Yi
Abstract A long-standing challenge in colorimetric detection of triacetone triperoxide (TATP) explosive is low sensitivity. We herein developed an iodine-mediated photoinduced auto-inductive tandem chromogenic system to achieve exponential signal amplification. The strategy employs the KI-TATP reaction and photo-induced autocatalytical oxidation of o-phenylenediamine (OPD) that work in tandem. The resulting I 3 − from the KI-TATP reaction oxidizes OPD to yellow 2,3-diaminophenazine (DAP) that is further excited by blue light illumination to produce reactive oxygen species (ROS). The obtained ROS, in turn, promotes the oxidation of OPD to gain more DAP, causing the auto-inductive chromogenic reaction processes. This tandem chromogenic system is applied for visual colorimetric detection of TATP, allowing the selective and sensitive detection of TATP down to 42.8 μM. Moreover, analyses of TATP in real samples are performed, and the satisfactory recovery results are achieved. Furthermore, a field detection kit is also developed. Graphical abstract
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 6
·1953-1960
·
IF 1.6
Luo Qingyun,Wang Chongshi,Zhu Wei,Yu Hongchao,Wang Chunyan,Chen Chuanhong
Due to its high adsorption capacity and adsorption efficiency, polymer gel shows excellent performances in the treatment of wastewater containing thorium. In this work, glutaraldehyde cross-linked N -(4-Aminobenzoyl)-ʟ-glutamic acid modified chitosan (CCS-AGA) was used to adsorb Th(IV) ions from aqueous solutions for the first time. FT-IR and SEM results revealed the chemical structure and surface morphology of this material. The influence of solution pH, contact time and initial concentration of Th ions on the adsorption of Th(IV) by CCS-AGA was investigated. The experimental data suggest that the adsorption behavior of CCS-AGA could be accurately predicted by the Langmuir model. The maximum theoretical adsorption capacity of CCS-AGA for Th(IV) was 162 mg/g. Moreover, this material exhibited excellent reusability and adsorption selectivity for Th(IV).
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 6
·3991-3999
·
IF 2.1
Du Xiangxiang,Liu Shujun,Xu Qin,Shi Xuejun
MnO 2 nanowires/polyaniline composite (MnO 2 NW/PANI) was prepared by combining one-dimensional MnO 2 nanowires (MnO 2 NW) with conductive polymer PANI surface coating. The MnO 2 NW were synthesized via a one-pot facile hydrothermal method. The composite MnO 2 NW/PANI was then prepared by in situ polymerization of aniline monomer on the surface of MnO 2 NW. The MnO 2 NW/PANI was able to serve as electroactive material and demonstrated a specific capacitance of 306.7 F/g recorded at a current density is 0.5 A/g, which is 28.4% higher than that of pristine MnO 2 (only 238.9 F/g). The reduced electric resistance within MnO 2 NW/PANI interconnection networks and the good synergistic effect between MnO 2 NW and PANI for fast ion/charge transfer supports the enhanced capacitance of the composite. In addition, the MnO 2 NW/PANI composite electrode shows stable cycle performance, with capacity retention of 88.7% after 5000 repeated cycles test at a high current density of 5 A/g. The constructed nanocomposites have great potential in the further development of high-performance electrochemical electrode materials for energy storage application.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 15
·6407-6418
·
IF 4.5
Yang Yaoxia,Kang Mi,Guo Xingwei,An Xuqin,Guo Fengyao,Zhang Lan,Wang Dangxia,Sun Dongfei,Zhou Xiaozhong,Yang Zhiwang
Doping hetero-atoms into non-noble metal phosphides, which is a better strategy for enhancement of electrocatalytic activity due to regulation of the electronic structure of catalysts. Herein, the F-doped CoP/Ni 2 P nanoarrays grown on nickel foam (NF) was fabricated by facile method as a self-supported electrode for hydrogen evolution reaction (HER), and this nanowires structure provide large specific surface area and more active sites. Additionally, the synergy effect between CoP and Ni 2 P can accelerate the electron transfer rate and increase the reaction rate. Moreover, the addition of strongly electronegative fluorine (F) can cause significant changes in electronic structure and enhance electrocatalytic HER performance. Therefore, the fabricated F-CoP/Ni 2 P/NF catalyst exhibits excellent HER activity in both alkaline and acidic electrolyte with a lower overpotential of 99 mV and 106 mV at a current density of 10 mA cm −2 and good durability. Hence, this work provides a simple method for exploring heteroatoms-regulated non-precious metal catalysts, which can be used to develop more efficient HER catalysts for water splitting. Graphical abstract
The self-supported fluorine-doped CoP/Ni 2 P nanowire array was prepared as efficient and stable electrocatalyst for hydrogen evolution reaction in both alkaline and acidic media.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-19
·
IF 16.6
Lu Yunfu,Chen Feifei,Zhao Qingmin,Cao Qiao,Chen Rongrong,Pan Huiwen,Wang Yanhui,Huang Haixin,Huang Ruimin,Liu Qian,Li Min,Bae Taeok,Liang Haihua,Lan Lefu
Phenol-soluble modulins (PSMs) and Staphylococcal protein A (SpA) are key virulence determinants for community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA), an important human pathogen that causes a wide range of diseases. Here, using chemical and genetic approaches, we show that inhibition of TarO, the first enzyme in the wall teichoic acid (WTA) biosynthetic pathway, decreases the expression of genes encoding PSMs and SpA in the prototypical CA-MRSA strain USA300 LAC. Mechanistically, these effects are linked to the activation of VraRS two-component system that directly represses the expression of accessory gene regulator ( agr ) locus and spa . The activation of VraRS was due in part to the loss of the functional integrity of penicillin-binding protein 2 (PBP2) in a PBP2a-dependent manner. TarO inhibition can also activate VraRS in a manner independent of PBP2a. We provide multiple lines of evidence that accumulation of lipid-linked peptidoglycan precursors is a trigger for the activation of VraRS. In sum, our results reveal that WTA biosynthesis plays an important role in the regulation of virulence gene expression in CA-MRSA, underlining TarO as an attractive target for anti-virulence therapy. Our data also suggest that acquisition of PBP2a-encoding mecA gene can impart an additional regulatory layer for the modulation of key signaling pathways in S. aureus .
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