CHEMOSPHERE
·
2024
·
IF 8.1
Mu Li
The release of organic dyes, such as Rhodamine B (RhB), into industrial wastewater has led to significant issues with color pollution in aquatic environments. Herein, we prepared a cobalt nanoparticles (NPs)-based catalyst with the nitrogen-doped carbon-support (Co@N–C) for effective PMS activation. The Co@N–C/PMS system demonstrated the excellent catalytic activity of Co@N–C for activating PMS, achieving nearly 100% degradation of RhB. Singlet oxygen ( 1 O 2 ) and sulfate radicals (SO 4 • - ) were dominant reactive oxygen species for RhB degradation. Density functional theory (DFT) calculations substantiated that the production of 1 O 2 commenced with the initial generation of *OH through hydrogen abstraction from PMS, culminating in the direct release of oxygen to form 1 O 2 (PMS→*OH→O*→ 1 O 2 ). The generation of SO 4 • - was attributed to electron transfer to PMS from the surface of Co NPs (Co 0 →Co 2+ →Co 3+ ) and the C–N shell (Co 2+ →Co 3+ ). The research findings provided new insights into the development of Co-based heterogeneous catalysis for advanced oxidation of refractory organic pollutants in wastewater treatment.
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ACTA PHYSICO-CHIMICA SINICA
·
2025
·
IF 13.5
Xianghai Song,Xiaoying Liu,Zhixiang Ren,Xiang Liu,Mei Wang,Yuanfeng Wu,Weiqiang Zhou,Zhi Zhu,Pengwei Huo
Photocatalytic carbon dioxide (CO 2 ) reduction represents a hopeful approach to addressing global energy and environmental issues. The quest for catalysts that demonstrate both high activity and selectivity for CO 2 conversion has attracted significant attention. In this study, ultrathin N-doped BiOBr was synthesized using a simple straightforward method. Systematic experimental results indicated that N-doping reduced the thickness of the BiOBr nanosheets and increased their specific surface area. Moreover, the efficiency of photogenerated charge carrier migration and the CO 2 adsorption capacity were significantly enhanced, contributing to improved CO 2 photoreduction performance. Experimental results showed that the 2N-BiOBr exhibited the best catalytic performance, with a CO evolution rate of 18.28 μmol·g −1 ·h −1 and nearly 100% CO selectivity in water, which was three times higher than that of pure BiOBr. The potential photocatalytic mechanism was investigated using in situ FTIR analysis and DFT simulations. Mechanistic studies revealed that N atoms replaced O atoms as adsorption centers, enhancing the strong adsorption selectivity towards CO 2 over O–H in BiOBr and facilitating the formation of key reaction intermediates. This study provides new perspectives on the creation and developmen of effective photocatalytic materials, offering theoretical support for the application of photocatalytic technology in energy and environmental science.
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Micro and Nanostructures
·
2024
·
IF 2.7
Yanghai Gui,Shuaishuai Zhao,Kuan Tian,Jintao Wu,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Dongjie Guo,Canxiang Fang
N-methyl pyrrolidone (NMP) is an organic compound that is mainly used in chemical synthesis, the manufacture of anesthetics and pesticides, and the production of electronic materials, especially in the preparation of electrodes for lithium-ion batteries. However, their high volatility and toxicity pose potential risks to health and the environment. Therefore, the development of rapid, highly sensitive and low-cost NMP gas sensors is urgent. In this paper, ZnO nanorods were in situ grown on ceramic tubes via hydrothermal method and subsequently annealed at different temperatures. The gas sensing performance of ZnO nanorods after annealing at different temperatures was investigated. The results show that the ZnO nanorods annealed at 400 °C have more oxygen vacancies and excellent selectivity to NMP at 210 °C, with a response value of up to 67.33–100 ppm NMP, a response time of 25 s, and a low recovery time as low as 8 s. The sensors have potential applications for rapid monitoring of NMP and environmental health protection, providing a simple and feasible method for NMP detection.
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Nanoscale
·
2024
·
IF 5.8
Yuke Zheng,Yunliang Dai,Yiwen Fu,Xiaojuan Zhang
Structural construction and heteroatom doping are deemed effective strategies for designing a high-performance microwave absorbing composite to eliminate electromagnetic hazards. Herein, a series of core–shell structural carbon@N-doped carbon (C@NC) nanospheres were successfully fabricated without employing additional modifying agents and sophisticated operation. After incorporating them into a polyvinylidene fluoride (PVDF) matrix, the C@NC/PVDF composites possess tunable wave attenuation capacity obtained by regulating the coating layer thickness and filler loading. Benefitting from the design strategy of the core–shell structure and N-doped C, the C@NC-2/PVDF composites displayed the broadest effective absorption bandwidth of 6.29 GHz (11.71–18 GHz) under a filler content of only 10 wt% at 2.01 mm. Additionally, the minimum reflection loss value of C@NC-3/PVDF composites achieves −62.87 dB within the same mass ratio at a thickness of 2.35 mm. The excellent wave dissipation ability is attributed to the combination of optimized impedance matching and synergistically enhanced multiple loss mechanisms including conduction loss, interfacial polarization as well as dipolar polarization. This work offers a ponderable paradigm for the deeper exploitation of high-efficiency carbon absorbers.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fei Wang,Guangcai Ma,Guofeng Cheng,Wenqing Hu,Zengtao Lv,Bin Chen,Wenbin Li,Yumeng Zang,Pengshan Liu,Zhuo Zhang
In this work, an efficient and stable photo-assisted electrocatalyst of N-doped CoNiOOH for overall seawater splitting are proposed. The doped N atoms triggered local contractions of lattice, thereby, promoted the morphologies of products to evolve from nanoflowers to nanowires (NWs), and the obvious electrocatalytic enhancements. Especially under the illumination of AM 1.5 G, the U30-NWs exhibited a photo-assisted cathodic current density from −2.0 to −4.0 mA cm −2 at −0.05 V vs RHE, and also an anodic stability for more than 48 hours in seawater . Our studies reveal that the doped N atom could accumulate more electrons than O atom, leading to the degradation of Co and Ni 3d and O 2p states on either side of Fermi level , thus a p-type feature with the widened band gap and improved UV–visible light absorption. Meanwhile, the corrosion resistance was thus improved due to the chemical stable N-Co(Ni)-N bonds. This work provides a practical strategy towards the H 2 production via photo-assisted electrocatalytic seawater splitting.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xue Wu,Hui Li,Fei Ge,Wenlin Xu,Hailong Lu,Minghao Zhou
Upgrading of lignin-derived bio-oil to value-added biofuel was of great significance for efficient utilization of renewable resources and reducing the use of fossil fuels. Hydrodeoxygenation (HDO) was considered to be a promising technology for the conversion of lignin-derived bio-oil. Herein, we reported a novel method for the preparation of lignin-MOF derived N-doped catalysts, which was then successfully introduced into the upgrading of lignin-derived phenols and lignin depolymerization. All catalysts were well characterized and Co/CN-0.5–750 exhibited excellent performance during the catalytic HDO process. The optimized catalyst demonstrated highly efficient active hydrogen generation from isopropanol. Moreover, it could afford the best vanillin (VAN) conversion (100 %) and highest 2-Methoxy-4-methylphenol (MMP) yield (92 %) under the mild reaction conditions (180 °C, 0.5 MPa nitrogen, 2 h). It was confirmed that the excellent performance was related to nitrogen doping. This study could provide some useful insights for the hydrodeoxygenation of lignin and its derivative.
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Polymers
·
2024
·Vol. 16
·期 2
·186
·
IF 4.7
Wenbin Wang,Wei Qiang,Chuntao Chen,Dongping Sun
The utilization of titanium dioxide (TiO2) as a photocatalyst for the treatment of wastewater has attracted significant attention in the environmental field. Herein, we prepared an NH2-MIL-125-derived N-doped TiO2@C Visible Light Catalyst through an in situ calcination method. The nitrogen element in the organic connector was released through calcination, simultaneously doping into the sample, thereby enhancing its spectral response to cover the visible region. The as-prepared N-doped TiO2@C catalyst exhibited a preserved cage structure even after calcination, thereby alleviating the optical shielding effect and further augmenting its photocatalytic performance by increasing the reaction sites between the catalyst and pollutants. The calcination time of the N-doped TiO2@C-450 °C catalyst was optimized to achieve a balance between the TiO2content and nitrogen doping level, ensuring efficient degradation rates for basic fuchsin (99.7%), Rhodamine B (89.9%) and tetracycline hydrochloride (93%) within 90 min. Thus, this study presents a feasible strategy for the efficient degradation of pollutants under visible light.Keywords:titanium dioxide;NH2-MIL-125;N-doped TiO2@C;visible light photocatalysis;wastewater pollutants
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 12
·1-14
·
IF 2.8
Zeng Fanen,Tan Zhen,Yang Xun,Wang Xiamei,Xu Bing
The practical application of hierarchical porous carbon materials in supercapacitors is very important. Therefore, the development of a high–performance hierarchical porous carbon material is a huge challenge. The waste coffee grounds–based porous carbon (WBC) was synthesized from waste coffee grounds by carbonization and static air activation. The physicochemical properties of WBC were observed by scanning electron microscopy with energy dispersive X–ray spectroscopy, X–ray diffraction, Raman spectroscopy, X–ray photoelectron spectroscopy, and N 2 adsorption–desorption analysis. The WBC activated at 800 ℃ has a more developed hierarchical porous structure with a specific surface area of 639.01 m 2 g –1 , and an average pore diameter of 2.77 nm. The formation mechanism of the WBC, which has a hierarchical porous structure in static air activation, was illustrated systematically. Within the three–electrode system, the optimal WBC exhibits the highest specific capacitance of 164.4 F g –1 at 0.5 A g –1 in 6 M KOH and an excellent rate capability of 84.85% at 5 A g –1 . The constructed symmetric SC with the optimal WBC as electrode material and 6 M KOH as electrolyte achieved an energy density of 8.15 Wh kg –1 at a power density of 250 W kg –1 and an outstanding cyclic retention rate of 100% over 7000 cycles at 10 A g –1 . The hierarchical porous structure of WBC exhibits high specific capacitance, high energy density, and stable cyclic retention rate, which provides a broad application prospect for realizing energy storage and conversion applications.
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MACROMOLECULES
·
2024
·
IF 5.1
Zhen Yu,Yanlin Liu,Sheng Wang,Yajin Fang,Xiangyu Zhou,Zhaobin Tang,Jin Zhu,Junping Zhang
Dynamic covalent adaptive networks can solve the recycling issue of thermosets. However, dissociative dynamic covalent networks may suffer from instability and network incompleteness at high temperatures or in solvents. Here, we report a novel dynamic covalent bond, N-sulfonyl guanidine urea (SGUA), that can undergo catalyst-free metathesis reactions, in which a passivation strategy of increasing the dissociation temperature of guanidine urea by introducing electron-withdrawing N-sulfonyl groups into adjacent positions was developed. Unlike conventional dissociative dynamic urea bonds, SGUAs exhibit associative metathesis reactions at around 120–180 °C, with a high dissociation threshold of 180 °C. The dynamic covalent polyurea constructed by SGUAs, named PSGUAs, exhibits ultrastrong (Young’s modulus exceeding 4 GPa and tensile strength exceeding 60 MPa) and stable (thermal stability, network structure integrity under reprocessing, and dimensional stability) performances. Furthermore, due to the excellent dynamic characteristics of SGUAs, PSGUAs were successfully reprocessed after 30–60 min of hot pressing at 160 °C and 20 MPa. Combining the long-lasting antibacterial properties of PSGUAs with long-term use, this study marks a substantial improvement in the field of dynamic polymer networks, giving a solution for balancing material stability, high performance, and reprocessability.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Yingying Liu,Wanjing Cui,Xiuge Chen,Ming Wang,Haifeng Zhang,Zhi Wang
Reverse osmosis (RO) membrane technology is applied widely on the water desalinization for relieving the challenge of freshwater scarcity. Polyamide (PA) membranes with superior water flux and rejection in the RO process are currently in high demand. In this study, a novel reactive additive N-(3-Aminopropyl)-imidazole (N-IM) was utilized to optimize the interfacial polymerization (IP) process and enhance PA-RO membrane performance. N-IM made the nascent film more porous and created an RO membrane with a thicker PA separation layer. The modified membrane exhibited a more hydrophilic surface, ascribing to more carboxylic acid groups. This membrane exhibited an improved water flux, increasing from 59.67 L/(m 2 ∙h) of original membrane to 82.76 L/(m 2 ∙h) of the modified membrane with the addition of 0.5 % w/v N-IM concentration, which was attributed to the enhanced hydrophilicity and increased water trapping capacity provided by the imidazole ring in N-IM. Additionally, the NaCl rejection increased from 98.75 % to 98.97 %, which can be attributed to the thicker separation layer and more carboxylic acid groups. In addition, the membrane showed excellent stability of performance and good pH stability. The study presents a novel approach to producing RO membranes with exceptional performance.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 46
·19508-19518
·
IF 2.7
Yuanyuan Wang,Yingjing Xia,Xingshen Dong,Wenyi Wang,Xueqin Wang,Yanxiu Liu,Peng Qiao,Geng Zhang,Shetian Liu
Supercapacitors, an innovative energy storage technology, combine the strengths of batteries and capacitors, enabling diverse applications in sectors such as communications, transportation, and aerospace. Porous carbon materials derived from biomass have excellent electrical conductivity, customizable dimensions, high surface area, and robust electrochemical stability, rendering them ideal candidates for supercapacitor electrodes. This research utilized edamame shells as the carbon precursor and KOH as the activating agent to synthesize a series of N/O co-doped porous carbons (ESC-x-800) through a combined pre-carbonization and activation process. This study thoroughly investigated the effect of KOH addition on the morphology, structure, and electrochemical performance of the materials. The result showed that the ESC-3-800 stood out as the top performer, distinguished by its unique self-doping characteristic with N and O atoms and a unique hierarchical porous structure. The ESC-3-800 boasted an impressive specific surface area of 3188.98 m2 g−1, coupled with a substantial pore volume of 1.86 cm3 g−1. When evaluated in a three-electrode system, ESC-3-800 demonstrated a remarkable specific capacitance of 301 F g−1, and a capacitance retention rate of 73.1% at a high current density of 20 A g−1. In a two-electrode setup, the ESC-3-800 achieved a notable high energy density of 37.6 W h kg−1 (at a power density of 200 W kg−1) in the 1 M Na2SO4 electrolyte. Remarkably, after enduring 12 000 charge–discharge cycles in 6 M KOH, it maintained an impressive 96.68% of its initial capacity (8 A g−1), demonstrating exceptional long-term stability and durability. The straightforward preparation method and outstanding performance of the edamame shell-derived N/O co-doped porous carbon underscore its immense potential for practical applications in supercapacitors.
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Jiaoyang Hao,Lin Tan,Jiaqi Xu,Xiaowei Ma
Metal organic frameworks (MOFs) derived materials have attracted a lot of attention in the field of electromagnetic wave (EMW) absorption. In this regard, we improved the EMW absorption performance of Ni-based MOF derived materials by introducing sulfur and nitrogen dual-doped graphene (N,S-GS), which possesses good electrical conductivity. The minimum reflection loss (RL min ) of Ni/C/N,S-GS can reach −51.4 dB at 10.1 GHz when the absorber thickness is only 2.43 mm, with an effective absorption bandwidth (EAB) of 3.04 GHz. This work provides us with a novel strategy for the synthesis of composites with high-performance microwave absorption for practical applications.
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