JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2025
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IF 3.1
Li Quanyang,Yu Liang,Shen Lv,Fu Jiankun,Zhou Ru,Hao Min,Jiang Juncheng
Polypropylene (PP) is a widely used thermoplastic resin known for its strong properties, including chemical stability, electrical insulation, and high abrasion resistance. However, its low ignition point and rapid burning rate pose significant fire risks, necessitating the incorporation of flame retardants. In this study, cobalt metal–organic framework (Co-MOF), melamine polyphosphate (MPP), and expandable graphite (EG) were combined to enhance the flame retardancy of PP. The optimal blending ratio was determined, and the results showed that PP/MPP/2 mass% Co-MOF/15 mass% EG composites exhibited superior flame retardancy. These composites achieved a critical oxygen index (LOI) of 28%, a V-0 rating in the UL-94 test, and significantly reduced heat release and smoke production during combustion. The synergistic effect of MPP, Co-MOF, and EG facilitated the formation of a dense, thermally stable carbon layer, which effectively hindered flame propagation and improved fire safety. These findings provide valuable insights for the development of flame-retardant PP materials. Graphical abstract
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COMBUSTION AND FLAME
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2025
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IF 6.2
Nan Liu,Qi Chen,Shuang Yu,Zhiyuan Qian,Jie Chen,Xianwu Jiang
Methanol holds promise as a fuel for spark ignition engines in achieving carbon neutrality, though its cold-starting remains a key challenge. Non-equilibrium plasma excitation emerges as a transformative solution, where a mechanistic understanding of reaction kinetics, particularly electron-fuel interactions governing radical generation and chain branching, is pivotal to advancing the efficiency of plasma-assisted methanol ignition. This study investigates the kinetic interplay between non-equilibrium plasma excitation and methanol oxidation through combined experiments and modelling. A detailed kinetic mechanism for plasma-driven methanol ignition is developed, incorporating electron scattering cross-sections of CH 3 OH calculated via the R -matrix method. For the first time, wall quenching of electronically excited species is integrated into the model. Experimental validation using GC confirms the modelling accuracy in predicting species evolution. Key findings reveal that non-thermal plasma reduces ignition delay time by 1–3 orders of magnitude compared to auto-ignition, with 89 % of discharge energy allocated to non-equilibrium excitation and <10 % to thermal effects. Path flux analysis reveals that there are distinct dissociation pathways for methanol under plasma conditions. Combustion reactions predominantly produce CH 2 OH via H-atom abstraction, while plasma reactions primarily generate CH 3 O through e + CH 3 OH → e + CH 3 O + H and CH 3 OH + X ⁎ (N( 2 D), O( 1 D)) → CH 3 O + XH. The difference is due to the fact that excited CH 3 OH is dissociated into CH 3 O and H, demonstrated via Quantum chemical calculations. Notably, electronically excited methanol undergoes two competing processes: the wall quenching reactions (CH 3 OH(e) + Wall → CH 3 OH + Wall) and the dehydrogenation reactions (CH 3 OH(e) + OH/HO 2 → CH 2 OH + H 2 O/H 2 O 2 ). The former quenches excited species, while the latter increases fuel radicals, thereby accelerating the chain reaction. These insights bridge plasma physics and combustion chemistry, offering a predictive framework for optimizing plasma-assisted methanol ignition under cold-starting conditions.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Liling Wang,Yanbin Wang
Hg 2+ ions, as one of the prevalent toxic heavy metals, are ubiquitously distributed in food and environmental systems. Consequently, there is an urgent demand to develop a convenient and reliable detection platform. In this study, heteroatom-doped PdCo@NC nanozymes were synthesized by pyrolyzing bimetallic metal-organic frameworks (MOFs) in argon, combining MOF-derived porous carbon with C/N co-doping. The resultant PdCo@NC-500 material exhibits a flower-like morphology with defects and uniform elemental distribution, demonstrating unique intrinsic peroxidase-like activity. This enables the oxidation of TMB in the absence of H₂O₂, with catalytic performance surpassing that of single-metal systems. Key reaction intermediates (•OH, 1 O₂) were verified through quenching experiments. Kinetic analysis revealed that this material possesses high catalytic efficiency ( K m = 0.101 mM, V max = 238.9 × 10 −3 M/s). Notably, following the distinctive REDOX reaction between H₂O₂ and Hg 2+ , the peroxidase-like activity of PdCo@NC-500 is significantly inhibited, enabling selective alteration of the reaction pathway and changing the product color from blue to yellow. This unique response characteristic provides a foundation for designing colorimetric sensors, achieving dual-wavelength colorimetric detection of Hg 2+ . Experimental results indicate that the linear range of this method is 50–1000 μM (λ = 450 nm) and 0.5–100 μM (λ = 652 nm), with a detection limit of 0.02 μM. This method has been successfully applied to highly sensitive detection of Hg 2+ in real water samples and rice, with recovery rates ranging from 94.87 % to 109.1 %.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yuan Li,Xuejiang Wang,Yuan Wang,Siqing Xia,Hongbin Xu,Jianfu Zhao
The co-occurrence of biodegradable microplastics (BMPs) and antibiotics in wastewater poses environmental concern. However, the effects of different environmental ageing processes on antibiotic-BMPs interfacial interactions remain inadequately characterized. This study systematically compared the adsorption-desorption behaviour of sulfamethazine (SM2) onto biodegradable poly(butylene succinate) microplastics (PBS-MPs) subjected to sewage microbial exposure (B-PBS-MPs) and sunlight exposure (P-PBS-MPs). Kinetics of SM2 adsorbed on all MPs conformed to the Elovich model, indicating that the adsorption rates synergistic controlled by liquid-film and intra-particle diffusion. The maximum adsorption capacities predicted by Langmuir model increased from 76.52 μg/g for PBS-MPs to 316.58 μg/g for B-PBS-MPs and 351.49 μg/g for P-PBS-MPs, indicating that sunlight exposure exerted more pronounced adsorption enhancement than microbial exposure. Mechanistic divergences were observed: pristine PBS-MPs exhibited Langmuir-type monolayer adsorption dominated by non-bonding interactions, whereas sunlight-exposed P-PBS-MPs followed Freundlich-type multilayer adsorption driven by hydrogen bonding and van der Waals forces. For microbial-exposed B-PBS-MPs, adsorption obeyed the Langmuir-Freundlich model—micropore filling may dominated at low SM2 concentrations, while complexation of SM2 and biofilm-associated extracellular polymeric substances (EPS) prevailed at higher concentrations. The results of desorption hysteresis indicated the most stable SM2 retention in microbial-exposed MPs via SM2-EPS chemical bonds and the least stable SM2 adsorption in sunlight-exposed MPs due to the weak binding force. These findings demonstrate that ageing differentiates biodegradable MPs into distinct antibiotic vectors: microbial exposure enhanced adsorption capacity and stability, whereas sunlight exposure elevated remobilization risks. This work contributes to the assessment of the compounded environmental risks of BMPs and antibiotics.
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高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Xuedong Jia,Hongyuan Guo,Runying Chai,Jingbin Shi,Hao Wu,Yujue Feng,Wei Ji,Suozhu Wu
A dual-functional membrane modified electrode - based molecularly imprinted electrochemical sensor was developed for the ultrasensitive and selective detection of quercetin (Que). The dual-functional membrane consisted of chitosan-modified carboxylated multi-walled carbon nanotubes (cMWCNT-CS) nanocomposites and β-cyclodextrin/dopamine molecularly imprinted polymer (β-CD-DA-MIP). The synergistic interactions between the conductive layer of cMWCNT-CS and the recognition element of β-CD-DA-MIP enabled high-performance detection of Que. This sensor exhibited an ultra-wide linear response range of 1.0 × 10 −14 to 1.0 × 10 −4 M with a limit of detection of 2.9 × 10 −16 M (S/N = 3). The sensor also had the advantages of simple fabrication, rapid response (6 min), excellent reproducibility, and high selectivity. The sensor was successfully used to detect Que. concentration in grape, grape juice, and wine samples with satisfactory results. This study provided a simple, efficient, and ultrasensitive method for monitoring the natural bioactive compounds, which offered potential applications for food quality control and pharmaceutical analysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yanni Lang,Dongfeng Hong,Rongze Ma,Haoqiang Zhang,Liang Xu,Xinye Zhao,Dan Wu,Yongjin Li,Dacheng Zhou,Zhiguo Song,Yugeng Wen,Yong Yang,Jin Han,Jianbei Qiu
The construction of chiral materials has always been a research hotspot in the field of non-chiral nanomaterials. By introducing chiral destructive agents, materials are endowed with chiral nanostructures, which can be used in the field of photocatalysis. Au nanoparticles (Au NPs) are a typical photosensitizer capable of producing surface plasmon resonance (SPR) effects, producing CO and CH 4 in photocatalytic CO 2 reduction. We suggest that the SPR effect of the photocatalyst (D-BiOBr/Au) for Au NPS deposition of nonchiral bismuth bromide oxide nanomaterials can enhance the photocatalytic CO 2 reduction by enhancing spin-polarized electrons. It is worth noting that D-BiOBr/Au chiral materials enhance spin-polarized electrons due to SPR effect, and their photocatalytic CO 2 reduction performance is significantly better than D-BiOBr and original BiOBr without SPR effect. The CO yield of D-BiOBr/Au is 24.39 μmol/g h −1 , which is 2.02 times of D-BiOBr and 2.43 times of BiOBr, respectively. The mechanism of photocatalytic CO 2 reduction was further studied by FDTD simulation. The reason for the improved photocatalytic CO 2 reduction efficiency of D-BiOBr/Au is the increase of spin-polarized electrons due to the SPR effect, thus prolonging the carrier lifetime and promoting spin-polarized electron-hole separation. The results show that enhancing spin-polarized electrons through SPR effect is an effective strategy to improve photocatalyzed CO 2 reduction in photocatalyzed semiconductors.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yan Lai,Luying Chen,Qiucheng Fu,Liang Jiang,Yongjuan Chen,Jiao He,Ning Zhang,Zhiying Yan
In this study, we propose a novel composite system combining black phosphorus (BP) nanosheets with Bi-MOF to overcome the three main limitations of conventional photocatalysts, narrow photoresponse range, high carrier recombination rate, and poor stability. The unique properties of BP, characterized by their narrow bandgap, are leveraged to expand the spectral response spectrum. The heterojunction interface facilitates the directed separation of charge carriers, while the MOF skeleton provides protection against environmental degradation, thus enhancing overall stability. In the experiments, a combined hydrothermal-ultrasonic approach was employed to ensure close interfacial contact between BP and rod-like Bi–BTC, resulting in the formation of an effective heterojunction. The BP/Bi–BTC composite exhibits remarkable broad-spectrum absorption characteristics, substantially expanding the photoresponse range and effectively inhibiting carrier complexation. Concurrently, the protective Bi–BTC skeleton successfully prevents direct environmental exposure of black phosphorus, enhancing its stability. The BP/Bi–BTC composite displays exceptional photocatalytic performance in the degradation of RhB, achieving an impressive degradation efficiency of 98.7% within just 30 min of UV–visible irradiation. This performance surpasses both single-component systems and conventional catalysts. Notably, the material retains 94.1% of its initial activity even after three consecutive catalytic cycles. Characterization analysis elucidated the interfacial charge transfer and uncovered the underlying catalytic mechanism of the composite system.
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POLYHEDRON
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2025
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IF 2.6
Shuaibo Shi,Sichen Li,Shishen Zhang,Kun Zhang
The development of highly selective and convenient fluorescence detection techniques to monitor water (H 2 O) remains a major challenge in various domains. In this article, a novel fluorescence sensing molecule Sm-1 f [Sm(HL1 f )(NO 3 ) 2 ] is rationally designed and synthesized, and Sm-1 f consists of a samarium ion, one deprotonated [1 + 1] Schiff-base macrocycle HL1 f − and two nitrates. This complex Sm-1 f then served as a solvent-response candidate in view of its dual-emission fluorescence and reversible structure. As a result, Sm-1 f shows the fast, selective and quantitative detection abilities for H 2 O among 13 common solvents. After the systematic statistical analysis for fluorescence signals of two channels, Sm-1 f also demonstrates excellent discrimination of 11 solvents and several pairs of solvent analogues, especially the H 2 O and D 2 O. Mechanistic studies confirm that the H 2 O-induced imine bond cleavage disrupts the sensitization effect of Schiff-base macrocycle which finally leads to a remarkable reduction of emission intensity. Furthermore, the smartphone-based RGB analytical technique enables the real-time and convenient detection of H 2 O without any complicated apparatuses. This work not only provides a powerful fluorescence probe and convenient technique for H 2 O detection but also expands the application of luminescent lanthanide materials.
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Molecular Catalysis
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2025
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IF 4.9
Xin Wang,Cong Li,Mengtong Wang,Jiangxin Li,Yuheng Xie,Juan Zhang
Methacrolein is an important intermediate in the fine chemical industry, and its synthesis has garnered significant attention from researchers. In this study, sixteen bifunctional heterogeneous catalysts (designated as PILCN-x) were synthesized. The activity of the catalyst was evaluated based on the synthesis of methacrolein from formaldehyde and propionaldehyde, with PILCN-II identified as the most effective catalyst. The optimal catalyst PILCN-II was characterized by FT-IR, SEM, BET, 1 H NMR, 13 C NMR, XPS and TGA. The effects of various reaction conditions, including solvent, acid, and reaction temperature, on catalytic performance were investigated in detail. The results showed that the optimum reaction conditions were as follows: DMF was used as the solvent; the catalyst dosage was 0.85 g; the formaldehyde/propionaldehyde molar ratio was maintained at 1:1; the reaction temperature was 70 °C; and the reaction time was 50 min. Under the optimal reaction conditions, the conversion rate of propionaldehyde was up to 99.09 %, and the yield of methacrolein was 98.70 %. Notably, after 5 reaction cycles, the catalytic activity of PILCN-II did not decrease significantly. In order to determine the reaction conditions more accurately, the response surface methodology was used, and the fitting results were in good agreement with the experimental results. Finally, kinetic studies showed that the reaction catalyzed by PILCN-II followed quasi-first-order kinetics.
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高影响因子
CARBON
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2025
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IF 11.6
Mengyao Li,Haining Chen,Jiayi Li,Yingzhi Li,Bohan Zhang,Yue Chu,Fei Yang,Zhongkuan Wei,Jialong Zhu,Junwei Han,Wei Lv
The challenge in decoupling the order and disorder phase evolution impedes the precise microstructure control of hard carbon (HC) anodes, fundamentally limiting the reconciliation of high capacity and fast kinetics for sodium storage. Here, we realize a precise modulation of order and disorder structures in HCs using bituminous coal precursors containing inherent aromatic units and aliphatic side chains. By removing the volatile small aromatic species (molecular weight < 500 amu) with methanol extraction, more active edges of coal macromolecules (molecular weight > 500 amu) and C-O/C=O/O-C=O functional groups are exposed, which enhances the cross-linking of macromolecules aromatic units, yielding long, curved microcrystalline domains with enlarged interlayer spacing and abundant closed nanopores. The extended carbon microcrystals boost electronic conductivity, while expanded interlayers and closed pores facilitate Na + diffusion and storage. As a result, the obtained HC has a high capacity of 256 mAh g -1 and long cycling stability (capacity retention of 80.8% after 1500 cycles) at a very high current density of 2000 mA g -1 . This work demonstrates a scalable route for precise structural modulation of coal-derived HC to reconcile capacity and rate performance in sodium-ion batteries.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2025
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IF 14.3
Zhiwei Wang,Zhengshen Bao,Xingliang Wang,Changqing Xia,Dehong Xu,Shixing Wang,Weili Li
Given the scarcity of precious metals in nature and the high costs of extraction and refinement, their recovery holds significant practical importance. In this study, we employed an induced-defect strategy to prepare a novel metal-organic framework material, UiO-67-MAA, using a one-step solvent method that exhibited rapid adsorption kinetics and ultra-high adsorption capacity. In addition, the ability of the material to recover Au(III) from aqueous solutions was evaluated through systematic adsorption experiments. Various characterisation methods were employed to verify the successful synthesis and structural stability of UiO-67-MAA. The maximum adsorption capacity of UiO-67-MAA for Au(III) reaches 814 mg/g. In repeated experiments, the removal effect of UiO-67-MAA on Au(III) remained significant even after five cycles. The adsorption mechanism was analysed by X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDS), confirming that S atoms interact with Au(III) to form a stable coordination structure. These results indicate that UiO-67-MAA possesses efficient adsorption properties for Au(III), thus demonstrating its significant potential for application in precious metal recovery.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Shuyan Zang,Wenxu Wang,Sitong Zong,Baoli Hu,Yingying Li,Shuai Wang,Jiandong Dong,Zhihao Fang
The efficient and effective removal of mixed pollutants from wastewater is of paramount importance for environmental remediation, given the diverse nature of contaminants present. In particular, arsenic (As) and ciprofloxacin (CIP) contamination in surface water has become increasingly severe. To address this challenge, this study synthesizes ZIF-67 and integrates it with the Fenton reaction to remove mixed As(III) and CIP pollutants from wastewater. Comprehensive characterization of ZIF-67 was conducted using FTIR, XRD, SEM, and BET analyses, as well as pHpzc measurements. As an efficient adsorbent, ZIF-67 offers a high surface area (1614 m²/g) and excels in removing pharmaceutical contaminants. A systematic investigation was conducted to evaluate the influence of key reaction parameters-including pH, H2O2/Fe2+ ratio, reaction temperature, adsorbent dosage, and reaction time-on pollutant removal efficiency, ultimately determining the optimal reaction conditions. The removal of As(III) and CIP follows a pseudo-second-order kinetic model and fits the Langmuir isotherm. Experimental results demonstrated that the maximum removal efficiencies for As(III) and CIP reached 98.07% and 99.96%, respectively, when ZIF-67 was coupled with the Fenton reaction. Mechanism studies indicate that during the coupling process, the Fenton reaction generates highly reactive hydroxyl radicals (•OH). These hydroxyl radicals (•OH) can oxidize trivalent arsenic and CIP into pentavalent arsenic and intermediate products, which are more easily adsorbed by ZIF-67, thereby enhancing the adsorption efficiency of ZIF-67 for pollutants. By leveraging the synergy of ZIF-67 and the Fenton reaction, this study proposes a promising strategy for enhanced As(III) and CIP removal, offering novel methods for wastewater treatment.
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高影响因子
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