COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Feng Yang,Junru Yao,Liqiang Jin,Wenjun Huyan,Jintang Zhou,Zhengjun Yao,Peijiang Liu,Xuewei Tao
Nowadays, multifunctional electromagnetic (EM) wave absorbing aerogels have attracted much attention due to intelligent and wearable features for electronic devices. However, the utilization of these aerogels at elevated temperature is still challenge. Herein, we describe a robust strategy to fabricate architecturally controllable and multifunctional Ti 3 C 2 T X MXene/aramid nanofiber (ANF)/polyimide (PI) aerogels with desirable EM wave absorption, adjustable mechanical property, and high thermal insulation . Rational structural design endows the aerogels with an effective absorption bandwidth (EAB) of 4.2 GHz (covering whole X-band) at 250 °C. Exploration of the temperature response over 25–250 °C reveals that the microstructure characters of the aerogels contribute substantially to the EM parameters at elevated temperature, while the in-depth temperature-dependent mechanisms of aerogel EM performance are well studied. Further, through regulating the microstructure, the MXene/ANF/PI aerogels also exhibit tunable mechanical performance (maximum compressive stress of 334.3 KPa at 40% compression) and promising thermal insulation performance (0.029 ± 0.003 W mK −1 , closing to air). These multifunctional aerogels light the way to potential application in the EM wave absorption field of flexible devices at elevated temperature.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xin Gao,Baodong Li,Shouwei Jian
The fabrication of visible-light-driven heterostructured photocatalysts has been regarded as a promising strategy to enhance the photocatalytic performance. Here, a wet chemical method was adopted to prepare step-scheme CeO 2 /CaIn 2 S 4 (CCIS) composites. The CeO 2 nanoparticles were deposited on the surface of CaIn 2 S 4 (CIS) to form a tight interface, namely, heterojunction , which was confirmed by the multiple characterization methods. The formed heterojunction between CeO 2 and CIS was advantageous to promoting the charge carrier separation and migration. The photocatalytic performance of the resulted CCIS composites were evaluated by the Cr(Ⅵ) reduction under visible light irradiation. The optimized CCIS-10 sample exhibited the highest photocatalytic Cr(Ⅵ) reduction activity with the efficiency of 95% within 105 min. The enhanced photocatalytic activity of CCIS was attributed to the construction of step-scheme heterojunction system, leading to the efficient charge separation and high redox potential . The proposed mechanism for the enhanced photocatalytic performance was fully discussed and confirmed. This work may provide a simple strategy to rationally design efficient photocatalyst for Cr(Ⅵ) removal.
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TALANTA
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2020
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IF 5.339
Jianping Guan,Jiao Yang,Yue Zhang,Xiaoxue Zhang,Huajuan Deng,Juan Xu,Jinyi Wang,Mao-Sen Yuan
The ongoing poisoning of agricultural products has pushed the security problem to become an important issue. Among them, exceeding the standard rate of pesticide residues is the main factor influencing the quality and security of agricultural products. Monitoring pesticide residues and developing simple, yet ultrasensitive detection systems for pesticide residues are urgently needed. In this study, we successfully developed a novel rhodamine derivative as fluorescent and colorimetric chemosensor R-G for the rapid, selective and ultrasensitive detection of glyphosate pesticide residue in aqueous solution. Through a Cu 2+ -indicator displacement strategy, glyphosate can displace an indicator ( R-G ) from a Cu 2+ -indicator complex due to its strong affinity to bind with Cu 2+ to give a turn-on fluorescence and distinct color change. Moreover, a test strip was also fabricated to achieve a facile detection of glyphosate pesticide. To demonstrate the possibility of practical applications, glyphosate was detected on the surface of cabbage and in a spiked soil sample. The detection limit of 4.1 nM and the response time of 2 min indicate that the method is enough sensitive and rapid to detect the glyphosate residue at or below levels that pose a health risk.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
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IF 2.781
Qiang Liu,Lei Gao,Xingsong Su,Fei Zhou,Guotao Duan
The cobalt phthalocyanine (CoPc) resistance-type sensors to NO 2 were prepared using CoPc thin films via interfacial self-assembly method. Their sensing performances were investigated with respect to different NO 2 concentrations from 1 to 50 ppm. It was found that the CoPc sensors show excellent sensing performance: relatively low temperature (115 °C), high sensitivity (2.7–10 ppm NO 2 with a detection limit of 1 ppm), fast response and recovery (response time ∼26 s and recovery time ∼34 s at 3 ppm of NO 2 ), and excellent stability (almost the same after 4 weeks), reliability and selectivity towards NO 2 . Further, the sensitivity showed a quasi-linear relationship versus the concentration of NO 2 in the ranges of 1–50 ppm. On account of their high performances, the prepared CoPc thin films via interfacial self-assembly method will provide a high-efficiency sensor for practical NO 2 sensing applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Qinglong Wang,Haiyan Li,Jing-He Yang,Qian Sun,Qiuye Li,Jianjun Yang
Iron(II) phthalocyanine (FePc) is immobilized on graphene sheets to form a graphene(G)/iron(II) phthalocyanine hybrid (G/FePc) by the π–π stacking method. The resultant hybrids are characterized by UV–vis absorption spectra, FTIR, Raman spectra, BET, TEM, SEM and XRD. The result suggests that the interaction between graphene and FePc follows a donor-acceptor mode and the loading of FePc on graphene sheets not only facilitates the dispersion of FePc on graphene but also promotes the exfoliation of the graphene sheets. These samples are tested for photocatalytic degradation of phenol under visible light irradiation ( λ ≥ 420 nm). And the photocatalytic activity of graphene, which is not presented when graphene individually acts on phenol, is greatly enhanced because of the π–π stacking interaction when FePc loaded on graphene. The G/FePc hybrid containing 25 wt.% FePc (G/FePc-0.25) exhibits the best photoactivity among the different loading content of FePc, whose degradation rate for phenol achieves 77.1% in the presence of H 2 O 2 under visible light irradiation for 3 h.
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REACTIVE & FUNCTIONAL POLYMERS
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2016
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IF 2.725
Zhaoyu Cao,Minming Wu,Yunfei Zhao,Lisha Dai,Rong Zeng,Mei Tu,Jianhao Zhao
Bioinspired double-positively charged phosphodicholine (PdC)-chitosan conjugate was synthesized via Atherton-Todd reaction, which can hydrolyze to zwitterionic phosphorylcholine (PC)-chitosan in basic solutions, confirmed by 1 H and 31 P NMR spectra. Thermal analysis revealed that there existed the freezing bound water due to the introduction of PdC and PC groups for both PdC-chitosan and PC-chitosan, implying that double-positively charged PdC-chitosan may exhibit excellent biocompatibility as zwitterionic PC-chitosan. Cytotoxicity, hemolysis and antibacterial activity evidenced that PdC-chitosan displayed high antibacterial activity against Escherichia coli and Staphylococcus aureus under physiological conditions, and very low cytotoxicity and hemolytic activity, owing to its highly selective lysis of bacterial membranes over mammalian cell membranes mainly resulting from the competition of electrostatic interactions and shielding effect of the restrained water of PdC, while biocompatible PC-chitosan showed no antibacterial activity due to its non-fouling property. The results indicated that biocompatible double-positively charged PdC-containing bioinspired polymers may provide a promising approach for developing safe and effective antibacterial agents .
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2016
·Vol. 21
·期 5
·1219-1228
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IF 2.327
Xing Ruimin,Yang Haitang,Li Shengnan,Yang Jinghe,Zhao Xiaoyu,Wang Qinglong,Liu Shanhu,Liu Xiuhua
Fabrication of multicomponent nanocomposites as electrode-modified materials is an effective strategy to design highly active electrochemical sensors. Here, we present a facile strategy to fabricate the palladium phthalocyanine-multiwalled carbon nanotube (PdPc-MWCNTs) nanocomposite for the sensitive detection of rutin. Results showed that the prepared nanocomposites exhibited excellent electrocatalytic activity toward rutin due to the synergetic effects of PdPc and MWCNTs (excellent electric conductivity and catalytic activity) and the homogeneous dispersibility of Nafion. Under the optimized conditions, the developed sensor exhibited a linear response range from 0.10 to 51 μM for rutin with a low detectable limit of 75 nM and a fast response less than 3.0 s. The proposed method might offer a possibility for electrochemical analysis of rutin in Chinese medical analysis or serum monitoring owing to its low cost, simplicity, high sensitivity, good stability, and few interferences against common coexisting ions in real samples.
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NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Runhong Zhu,Yunlong Shi,Yi Zhou,Yi Xia,Qin Qi,Xiaojie Liang,Meijuan Kuang,Zhenya Jia,Mengyue Wang,Changjiang Yu
In this study, a type of FeNi alloy embedded in biochar (BC) was prepared by a simple, efficient, and pollution-free method to form core–shell type BC@FeNi magnetic materials (BC@FeNi-T-X). The reduction behavior of Fe3+ and Ni2+ during preparation was analyzed, showing their transformation from ionic states to oxidized states, forming metal monomers and alloys. Increasing the Ni content in the SA–Fe3+/Ni2+ gel led to the formation of Fe0.64Ni0.36 and (Fe,Ni) alloys. Mechanistic insights were obtained through adsorption kinetics and isotherm data fitting and by analyzing composite changes before and after Cr(VI) adsorption. BC@FeNi-900-3 exhibited superior corrosion performance compared to the Fe biochar composite (BC@Fe-900-3), enhancing Cr(VI) reduction. Mechanistic studies revealed that Cr(VI) removal by BC@FeNi-900-3 primarily involved (i) Cr(VI) reduction to Cr(III) by Fe0.64Ni0.36 and Fe, (ii) Cr(VI) reduction to Cr(III) by Fe2+, (iii) Cr(VI) reduction to Cr(III) by H˙ generated via Fe0.64Ni0.36 corrosion, and (iv) Cr(VI) adsorption by BC@FeNi-900-3.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Zhaoying Yang,Xinge Wu,Gaowu Qin,Xiangying Meng
FeCo-N-C is considered a promising electrode material for hydrogen fuel cells. However, its oxygen reduction reaction (ORR) performance is limited by the strong adsorption of intermediates. In this work, we regulated the adsorption of “metal-intermediates” by modulating the interaction between the metal and support. The sulfur atoms were introduced to modify the periphery of the M-N x sites, and an atom-dispersed bimetallic site micro-mesoporous catalyst (FeCo-SN-C) was synthesized. The S dopant enhances the bonding between the metal catalytic sites and the support, which weakens the adsorption of ORR intermediates on catalytic sites, resulting in exceptional stability and ORR activity of the catalyst. ORR tests showed that FeCo-SN-C in 0.1 M KOH exhibited superior half-wave potential (0.863 V vs. RHE), which outperformed Pt/C (0.833 V), along with high stability and methanol tolerance. Theoretical calculations demonstrated that the doping of S effectively shifted the 3d electron orbital of the Fe site to a deeper level, optimized the adsorption and desorption energy barriers of the key oxygen-containing intermediate (∗OH), and promoted the ORR. Additionally, the Zn-air batteries based on FeCo-SN-C exhibited excellent discharge performance and durability. This study provides insights and solutions for the rational design of TM-N-C catalysts to enhance their activity and stability.
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Small
·
2024
·
IF 13
Haodong Gu,Li Tian,Qiuqi Zhang,Xiao You,Mengmeng Wang,Shaoming Dong,Jinshan Yang
Electromagnetic protection in extreme environments requires materials with excellent thermal insulation capability and mechanical property to withstand severe temperature fluctuations and complex external stresses. Achieving strong electromagnetic wave absorption (EMA) while sustaining these exceptional properties remains a significant challenge. Herein, a facile approach is demonstrated to fabricate a biomimetic leaf-vein MXene/CNTs/PI (MCP) aerogel with parallel venations through bidirectional freeze-casting method. Due to its multi-arch lamellar structure and parallel venations within the aerogel layers, the ultralight MCP aerogel (16.9 mg·cm −3 ) achieves a minimum reflection loss (RL min ) of −75.8 dB and a maximum effective absorption bandwidth (EAB max ) of 7.14 GHz with an absorber content of only 2.4 wt%, which also exhibits superelasticity and structural stability over a wide temperature range from −196 to 400 °C. Moreover, this unique structure facilitates rapid heat dissipation within the layers, while significantly impeding heat transfer between adjacent layers, achieving an ultralow thermal conductivity of 15.3 mW·m −1 ·K −1 for thermal superinsulation. The combination of excellent EMA performance, robust structural stability, and thermal superinsulation provides a potential design scheme under extreme conditions, especially in aerospace applications.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2024
·
IF 5.4
Yanhao Liu,Shubin Li,Jiang Zhu,Lili Fan,Lu Wang
The use of hydrogels to mimic natural cartilage implantation can effectively solve the current problems of insufficient cartilage donors and low rate of injury healing. In particular, injectable hydrogels are less invasive in clinical applications and better able to fill uneven injury surfaces. Here, we prepared NorCS and CS-SH by modifying chitosan with 5-norbornene-2-carboxylic acid and N-Acetyl-L-cysteine, respectively. Dual-network hydrogels were prepared by using UV-triggered thiol-ene click reaction between NorCS and CS-SH and the metal coordination between SA and Ca 2+ . The prepared hydrogels can be cross-linked quickly and exhibit excellent degradability, self-healing and injectable properties. At the same time, the hydrogel also showed good cytocompatibility and could significantly restore the motor function of mice. This study provides an effective strategy for preparing injectable hydrogels capable of rapid cross-linking.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Danyan Lin,Xiujie Lin,Hao Li,Hongyuan Huang,Huan Yang,Jie Yang,Baowei Hu,Fengfeng Chen,Xinrong Guo,Xiangke Wang,Wen Yao
Herein, the ultrathin porous nitrogen-doped carbon nanosheet (uPNC-NS-800) catalyst was developed for efficient Cr(VI) reduction. Its versatile structures were obtained via thermal exfoliation of metal-organic frameworks with KCl. Impressively, uPNC-NS-800 achieved complete reduction of Cr(VI) to Cr(III) within only 6 min in oxalic acid (OA) aqueous solution, exhibiting significantly higher catalytic efficiency compared to PNC-NS-800, which lacks ultrathin structure. It also retained high catalytic activity after twelve cycles and exhibited excellent applicability, effectively removing Cr(VI) from various water environment within 30 min. Additionally, electron paramagnetic resonance spectroscopy indicated that uPNC-NS-800 promoted the generation of ·CO 2 − and ·OH radicals from OA, accelerating Cr(VI) reduction. Density functional theory calculations suggested that Defect C was the dominated active center and Pyridine N, Pyrrole N, and Graphite N were the synergistic active sites to together facilitate Cr(VI) reduction. This study provides a new insight into designing efficient carbon-based catalysts for real environmental wastewater remediation.
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