JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2019
·Vol. 19
·期 1
·57-65
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IF 1.093
Liu Wolong,Zhang Jiupeng,Liu Qi,Pei Jianzhong,Zhu Cunzhen,Liu Peng
Micro-damages always occur and accumulate in asphalt pavement materials under the effects of temperature, vehicle loads and other factors during service. Accordingly, self-healing microcapsules could be added into asphalt binder and repair micro-damages to prevent damage extension in
time. In this study, the emulsified rejuvenator and melamine-urea-formaldehyde resin (MUF) were selected as the core and cyst wall materials, respectively, and in-situ polymerization method was applied to synthesize the novel microcapsules. The effects of emulsifier dosage and curing
time were revealed on the particle size, dispersion, surface morphology and coating properties, and the optimum process parameters were determined for microcapsules. Then, the micro morphology, molecular structure, and thermal stability were further investigated to determine the optimal preparation
of the microcapsules. Finally, the linear amplitude sweep (LAS) test was performed to evaluate the self-healing efficiency of the asphalt binder with different dosages of prepared microcapsule, and the optimal dosage of microcapsules was determined as 0.5%.
研究领域:
材料科学
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土木工程
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化学工程
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POLYMER COMPOSITES
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2025
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IF 4.7
Chunying Min,Jiejie Huang,Hongyu Liang,Amna Siddique,Zhiwei Xu
The aggregation issues of two-dimensional nanomaterials remain a barrier to improving the tribological properties of the polymer matrix. Herein, γ-graphyne (γ-GY)/graphitic carbon nitride quantum dots (CNQDs) hybrids were fabricated by the hydrothermal method and incorporated into epoxy resin (EP). CNQDs are uniformly anchored onto the surfaces of γ-GY; the hybrids with multiscale structures are conducive to optimizing the interfacial compatibility with the EP. Compared with pure EP, γ-GY/CNQDs/EP composites exhibited better thermal properties, with a 27.2% increase in tensile strength. Furthermore, the average friction coefficient and wear rate were decreased by 34% and 76.2%, respectively. The wear surfaces of γ-GY/CNQDs/EP composites were analyzed via scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) to reveal the synergistic lubrication mechanism between γ-GY and CNQDs in the EP matrix.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 11
·e70420
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IF 0
Hui Bai,Guyu Zhang,Fengqin Tang,Lili Huang,Mingxia Tian,Libing Hu,Zhenghang Qi,Jianhui Jiang
Developing porous-structured organic semiconductor photocatalysts with high charge transfer efficiency is crucial for solar energy utilization, yet remains challenging in pollutant remediation. Herein, an S-scheme C-ZnO/B-g-C 3 N 4 photocatalyst with oxygen vacancies was fabricated through modified biomass-derived C doping for methylene blue (MB) degradation. The optimized catalyst achieved 97.8% degradation efficiency within 70 min under visible light. UV-DRS analysis revealed that C doping narrowed the bandgap and enhanced visible-light absorption. XPS results confirmed the S-scheme charge transfer pathway in C-ZnO/B-g-C 3 N 4 . The synergistic effects of C doping and oxygen vacancies significantly improved charge separation and facilitated S-scheme heterojunction formation. The catalyst exhibited superior photocatalytic performance in alkaline conditions and maintained excellent recyclability. Radical trapping experiments identified the primary reactive species as h + > ·O 2 − > ·OH in descending order of contribution. This work provides a promising strategy for solar-driven pollutant remediation by combining biomass-derived carbon modification with S-scheme heterojunction engineering.
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Small
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2025
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IF 12.1
Zhenlong Liu,Jiayuan Zhang,Liping Jiang,Ruiyan Zheng,Zunyuan Xie,Jizhen Li,Guofang Zhang
Nanoconfined composites exhibit outstanding catalytic performance for the thermal decomposition of ammonium perchlorate (AP). However, it remains a formidable challenge to construct nanoconfined catalysts when the restricted species are insoluble precipitates that form rapidly at room temperature. Herein, a general precursor-based stepwise confined strategy is proposed to encapsulate M 3 [Fe(CN) 6 ] 2 ·xH 2 O (M-Fe-PBA) (M = Fe, Co, Ni, Cu, Zn) within N-doped hollow carbon nanospheres (NHCs), resulting in yolk-shell structured composites, M-Fe-PBA@NHCs. Catalytic tests reveal that 5 wt.% Co-Fe-PBA@NHCs show the highest catalytic activity among the M-Fe-PBA@NHCs composites, significantly lowering the high-temperature decomposition peak of AP and increasing its heat release. Electrochemical analysis confirms that fast electron transfer of Co-Fe-PBA@NHCs facilitates AP combustion. TGA-FTIR-MS measurements further elucidate an accelerated decomposition pathway. Density functional theory calculations indicate that NH 3 and O 2 released during AP degradation are preferentially adsorbed on the in situ formed Co 3 O 4 /CoFe 2 O 4 , promoting O 2 reduction to O 2 − species and facilitating the deeper oxidation of NH 3 into higher-valence NO 2 . Crucially, this confinement strategy enables the efficient incorporation of instantly formed insoluble species into any hollow host material with accessible voids, providing a versatile platform for the development of multifunctional nanoconfined catalysts and the rational design of high-performance confined catalysts with potential applications.
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QUIMICA NOVA
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2025
·
IF 0.7
Zhang Shuo,Yang Yuanrong,Meng Kun,Zhu Xinyong,Huang Longjiang,Sui Lina,Yu Liyan
To detect melamine in packaging materials, terahertz time-domain spectroscopy (THz-TDS) was employed to measure the terahertz absorption spectra of melamine-polyethylene mixtures with varying mass ratios (1:0-3). The results revealed distinct characteristic absorption peaks of melamine at 2.0, 2.28, and 2.6 THz. Among these, the peak at 2.0 THz was the most prominent and remained clearly observable even within packaging materials. Several common packaging materials, including low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyethylene terephthalate (PET), and paperboard, were examined individually to assess their spectral interference. Characteristic melamine absorption peaks at 2.0 and 2.28 THz were used to establish a calibration model based on Gaussian distribution functions. Based on the International Union of Pure and Applied Chemistry (IUPAC) method, the limit of detection (LOD) and limit of quantification (LOQ) were calculated to be 15 and 80%, respectively. Even at a concentration close to the LOD (10%), the signal remained distinguishable (signal/noise (S/N) > 3). X-ray powder diffraction (XRD) was utilized as a complementary technique to confirm the presence of melamine in the transparent plastic zip bag. These results support the effectiveness of THz-TDS in detecting melamine through packaging materials and highlight its potential application for detecting specific molecules in packaging materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Changjun Xia,Xushuai Chen,Jincui Gu,Panpan Zhang,Chunjia Luo,Ruiqi Zhao,Xiaohan Niu,Luke Yan
Weak intersheet interactions induce interlayer swelling in 2D MXene membranes, limiting their otherwise promising practical application in water purification. Herein, we developed an anti-swelling MXene-based membrane for water purification. Supramolecular hydrogen bonding between MXene and graphitic carbon nitride (CN) nanosheets enabled the formation of a tightly packed structure. Concurrently, covalent interactions involving polydopamine (PDA) and polyethyleneimine (PEI) enhanced cross-linking, which created a nanoconfined interlayer space to suppress swelling. Notably, the MXene/CN@PDA/PEI membrane maintained a stable interlayer spacing of 15.27 ± 0.08 Å even after 700 h of water immersion—outperforming most reported MXene-based membranes. Furthermore, its broad light absorption and narrow bandgap (~2.10 eV) enabled superior self-cleaning performance. In cyclic tests, it retained ~90.7 % flux recovery after 40 h, demonstrating that nanoconfinement effectively suppresses swelling and stabilizes active sites. This study presents an effective approach for developing high-performance MXene membranes featuring anti-swelling and self-cleaning capabilities, aimed at sustainable water purification.
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CONSTRUCTION AND BUILDING MATERIALS
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2025
·
IF 8
Xiaoling Zou,Yuyang Yan,Yanqiu Bi,Ying Yuan,Bin Li
Asphalt pavements develop fatigue cracks during long-term service, while conventional rehab methods are inefficient and costly. Due to its excellent self-healing enhancement performance, microcapsule technology has become a research hotspot. However, current research lacks systematic investigation into the stability of microcapsules during construction and service phases, as well as the accuracy of their release mechanisms. This research aims to prepare self-healing microcapsules tailored for asphalt mixture. Accordingly, it systematically executed a full-process material optimization, structural regulation, and performance validation. Firstly, gel-permeation chromatography (GPC) was used to select the optimal rejuvenator as the core material. Meanwhile, the melamine-urea-formaldehyde (MUF) shell was chosen based on the asphalt mixture matrix's elastic-modulus matching criterion. Subsequently, microcapsules were synthesized via in-situ polymerization. By adjusting the core-shell ratio and particle size, microcapsules with controllable diameter (5–150 µm), adjustable shell thickness (200–500 nm), and compatible elastic modulus with asphalt were fabricated. Then, scanning electron microscope (SEM), differential scanning calorimetry (DSC), and nanoindentation test revealed that the microcapsules exhibit excellent thermal stability (decomposition temperature 240–280 °C) and mechanical compatibility with asphalt. Finally, rutting tests, pull-out tests, and fluorescence microscopy (FM) revealed that MUF microcapsules (particle size <25 µm) showed 60.23 % survival during construction (23.6 % higher than melamine formaldehyde microcapsules). The service-phase loss rate remained below 3 %, and the self-healing completion of asphalt cracks takes 15 min. This research achieves the tri-functional integration of “survivability, triggerability, and restorability” for microcapsules within asphalt mixtures. Providing a reliable technological pathway to enhance asphalt pavement life-cycle performance.
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JOURNAL OF CATALYSIS
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2025
·
IF 6.5
Wenli Zhang,Xu Han,Xianhong Zheng,Yi Yang,Zhiqi Zhao,Haiwei Yang,Yi Zhang,Chengbo Du,Zongqian Wang,Qingbo Xu,Changlong Li,Peng Wang
Solar-driven photocatalysis is inherently limited by its diurnal discontinuity. Herein, we report a V 2 O 5 /g-C 3 N 4 /Ti 3 C 2 triadic composite that transcends this limitation via a “micro proton-battery-like” mechanism, enabling round-the-clock catalytic activity. The optimized composite achieves 93.9 % tetracycline degradation under visible light and, remarkably, maintains 64.1 % efficiency in the dark. This is underpinned by an 8-fold higher electron storage capacity (0.16 μmol/mg) than pristine g-C 3 N 4 , achieved via reversible V 5+ /V 4+ redox transitions. DFT calculations corroborate charge localization in V 3d orbitals during the light-driven “charging” phase and subsequent Ti 3 C 2 -mediated electron release for ·O 2 − generation in the dark. This work establishes a groundbreaking paradigm that unifies photocatalysis with electrochemical energy storage for persistent environmental remediation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Jiani Qin,Yongqi Zhang,Minna Duan,Ruochen Hua,Chuanyi Wang,Bao Pan
Carbon nitride (CN)-based S-scheme heterojunction photocatalysts are a research hotspot for photocatalytic water splitting due to their efficient charge separation capability. This study successfully constructed a CuO/CN S-scheme heterojunction via a two-step calcination method and systematically investigated the effects of CuO content and calcination temperature on the material properties. Characterization results revealed that CuO nanoparticles were uniformly loaded onto CN nanosheets. 0.28 %CuO/CN exhibited the largest specific surface area and the narrowest bandgap. Synergistic nitrogen vacancies significantly enhanced charge carrier separation efficiency. Under 100 W LED light irradiation, the photocatalytic performance showed that 0.28 %CuO/CN calcined at 550 °C under air atmosphere achieved an H 2 evolution rate of 10.4 mmol h −1 g −1 and an apparent quantum efficiency (AQE) of 11.5 %, which is 9.0 times higher than that of pure CN. Furthermore, the activity decreased by only 3.4 % after 4 cycles. Mechanistic studies confirmed by in-situ EPR and band structure analysis, demonstrated that the built-in electric field drives electrons to follow an S-scheme migration path. This work provides a new strategy for designing highly efficient and stable defect-engineered S-scheme heterojunction photocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Hengyi Lu,Huanxiao Li,Chuyang Liu,Jiayi Shao,Fangqi Guo,Xiang Tian,Xiaopeng Li,Pan Ying,Yujing Zhang,Guangbin Ji
To tackle the complex electromagnetic pollution from advances in radar and network technologies, a simple, low-cost, and efficient absorbing agent has been developed. By optimizing the high-temperature sintering of the melamine/reduced iron powder composite system, we successfully created a Fe-C-N multiphase composite material with multi-level structure and dielectric-magnetic loss properties. The gas produced by the decomposition of melamine at high temperatures fosters the formation of a pore structure. Additionally, controlling the heating temperature and holding time effectively manages the phase transition path, allowing for synergistic evolution of the microstructure and regulation of the microwave-absorbing properties. The analysis of SEM images and XRD results identifies the synergistic enhancement mechanism between the multi-level structure and multi-phase. This endows a reflection loss of -75.91 dB at 5.16 GHz for samples held at 700°C for 3 hours (thickness 4.4 mm), with a maximum bandwidth of 4.92 GHz (1.6 mm). It avoids the traditional multi-step process of carbon/nitrogen doping, effectively regulating the phase transition path and microstructure evolution. This provides a new approach to develop lightweight, broadband microwave absorbing materials.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Xiaoling Chen,Yujuan Lu,Hui Li,Hongwei Mi,Guoqiang Zhang
Non-radiative recombination is the key bottleneck to overcome the charge separation problem. Here, we use poly(heptazine imide) (PHI) as a model photocatalyst to investigate the effect of internal electric field (IEF) on non-radiative recombination. Introducing electron-deficient boron atoms into the PHI structure leads to an uneven distribution of in-plane charges, spontaneously polarizing the formation of an IEF. This enhanced IEF can exert a force on the carrier in the opposite direction of the Coulomb force, thus effectively weakening the carrier trapping by the charged defect, thereby suppressing the non-radiative recombination. This is the first systematic research of suppressing non-radiative recombination by IEF in photocatalysis, which provides guiding strategies for addressing the bottleneck of charge separation in photocatalysis.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
·
IF 8.4
Quan Yuan,Yiran Hu,Qin Zhu,Chunmei Wang,Xiaomin Dou,Jun Liu
Water resource shortage and water pollution are global challenges. Simultaneously obtaining clean water and mitigating pollutants from harsh water sources are continuously pursued in research community and industry sector. In this work, a TiO 2 /g-C 3 N 4 /PPy@MS (TGP@MS) composite was fabricated to harvest water and mitigate tylosin from wastewater concurrently through a coupled process of solar-driven evaporation and photocatalysis. The composite presents exceptional hydrophilicity, broad-spectrum light absorption, and superior catalytic activity. Incorporating polysized phenylamine onto TiO 2 /g-C 3 N 4 enhanced infrared light absorption, extending the light absorption across the full solar spectrum range of 300–1200 nm and ultimately achieving an absorption rate of 91.6 % within this range. The 3D porous structure and the hydrophilic nature of the hydrogel sponge facilitated the capillary-driven water transport to surfaces. Under one sun condition, an evaporation rate of 1.49 kg/(m 2 ·h) and a photothermal conversion efficiency of 89.4 % were achieved for TGP@MS. Active species including ·OH and 1 O 2 were generated from the TiO 2 /g-C 3 N 4 components, degrading 90 % of tylosin within 150 min. Due to the versatile purification capabilities, TGP@MS could treat a wide range of water samples, enabling simultaneous water recovery and pollutant removal. Therefore, this work demonstrates significant potential in addressing the water crisis in underdeveloped areas. It achieves this by simultaneously producing clean water and mitigating pollutants from low-quality water sources, using green and sustainable solar energy.
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