JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Zhigang Yi,Xiangnan Chen,Zhenhua Dong,Ruohao Li,Qiong Tang,Xin Tian
The low efficiency and insufficient long-term cycling stability under high current density remains one of the bottleneck issues restricting the development of vanadium flow batteries. Based on the integrated ‘rigid-flexible’ characteristics, carbonized polypyrrole/polyvinylpyrrolidone interlaced architectures are constructed on the carbon felts to synergistically enhance the electrochemical activity and long-term cycling stability. The modified electrode (N-NCF) achieves a specific surface area of 11.98 m 2 /g, which is 6.34 times that of the pristine carbon felt (PCF). Under 280 mA cm −2 , N-NCF maintains an energy efficiency of 73.1 %, representing a 5 % improvement over PCF. Furthermore, the nanofiber-interlaced architectures enable N-NCF to exhibit exceptional long-term cycling stability. After over 10,000 cycles under 280 mA cm −2 , the energy efficiency remains 66.4 %, with an extremely low decay rate of 0.000899 %. The optimized N-doping and nanofiber-interlaced architectures synergistically enhance the electrochemical activity and stability of the carbon felts, thereby establishing a long-term stable electrochemical catalytic network. This work provides referencing strategies for the stable electrodes of vanadium flow batteries.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Huaqi Zhang,Siyi Chen,Zhenhao Wang,Chaoran Fan,Tianming Li,Na Yan,Yian Zheng
Semi-coke (SC), a solid waste generated from the dry distillation of oil shale, is rich in organic matter, classifying it as a functional carbon-based material. Combining the progressive advantages of functionalized carbon-based materials in advanced oxidation technology, this study prepared Fe-N co-doped semi-coke (Fe-N-SC) through a facile one-step pyrolysis of SC pre-impregnated with potassium ferricyanide. Under visible light (VIS) irradiation, Fe-N-SC was able to activate periodate (PI) to establish an Fe-N-SC/PI/VIS system for degrading norfloxacin (NOR). The results showed that this system achieved 99.5%-NOR removal, with a mineralization degree of up to 68.6%- within 30 min. Furthermore, Fe-N-SC exhibited stable performance over a wide pH range (3−9) and maintained high NOR removal efficiency in real water matrices, indicating its robustness and practical applicability. Electron paramagnetic resonance and free radical quenching experiments revealed that h + and ·OH were the primary species responsible for NOR degradation in Fe-N-SC/PI/VIS system. The proposed mechanism involved reactive oxygen species-driven oxidative cleavage of piperazine ring in NOR, leading to its stepwise breakdown and mineralization into harmless end-products. During the degradation process, no toxic intermediates were detected, highlighting the environmental safety of Fe-N-SC/PI/VIS system for sustainable and highly effective removal of antibiotics from aquatic environment.
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ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 47
·期 8
·1-20
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IF 3.8
Hu Zhengchun,Huang Xinrui,Shen Wu,Guo Minghao,Liao Bing
Leakage and migration of landfill leachate are often accompanied by complex biogeochemical processes that form a continuous series of redox zones in the leachate plume. Nitrogen in leachate, especially NH 4 ⁺-N, is one of the most important pollutants contributing to groundwater contamination. While traditional landfill pollution prevention and control measures often have difficulty effectively addressing the complex migration and transformation behaviors of NH 4 ⁺-N in leachate, an in-depth study of the migration and transformation processes of NH 4 ⁺-N in the redox compartment is crucial for the development of accurate and efficient pollution prevention and control strategies. In this study, static transformation experiments, dynamic simulated column experiments and high-throughput sequencing techniques were used to systematically investigate the migration and transformation processes of NH₄⁺-N in the redox bands of a simulated landfill. The results showed that in the NH 4 ⁺-N transformation experiment, the soil in the simulated oxidation zone had the strongest ability to transform NH 4 ⁺-N, with the NH 4 ⁺-N concentration decreasing from 40 to 0.03 mg/L, whereas the sterilization treatment completely suppressed the transformation process of NH 4 ⁺-N in the OZ. The NH 4 ⁺-N in the continuous redox zone completely penetrated the simulated soil column on the 7th day, and the maximum effluent concentration was stable in the range of 1530 ± 30 mg/L. The trends of NH 4 ⁺-N in each independent redox zone were consistent, with the TZ having the richest microbial community abundance and number of species, and some Acidobacteria were able to reduce Fe(III) under anoxic conditions and interact with the organic matter, which effectively contributed to the cycling of Fe within the TZ. These findings indicate that there are significant differences in the biogeochemical cycling process of NH 4 ⁺-N in different redox zone environments, and this study provides a new research perspective for a deeper understanding of the biogeochemical cycling mechanism of the elements in landfills and an important scientific basis for the prevention, control, and remediation of landfill pollution.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2025
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IF 5
Nusrullah Mehtab,Lu Bin,Miao Guilan,Bibi Amna,Wang Yanmei
Acrylamide-based non-ionic polymers have gained significant attention for wastewater treatment due to their high flocculation efficiency. However, optimizing the polymer dosage and knowing the role of hydrogen bonding in flocculation remain challenging. In this study, acrylamide/(N-hydroxyethyl)acrylamide (AM/HEA) copolymers at different molar ratios were synthesized via solution polymerization. The polymers were characterized using FTIR, 1 H NMR, DSC, and TGA. The kaolin suspension was employed to evaluate the flocculation performance of copolymers by the jar test method. The AM/HEA copolymers showed superior flocculation efficiency, achieving 98% turbidity removal at an optimal polymer flocculant dose of 0.2 mg/L, with a stirring speed of 400 rpm and a stirring time of 180 s. Zeta potential and TEM imaging results showed that flocculation primarily occurred through polymer adsorption on the kaolin surface, with its coiled conformation may enhance particle bridging. These results emphasize the critical role of polymer molecular structure in optimizing flocculation performance and suggest AM/HEA copolymers as efficient flocculants for water treatment exercises.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Xiang Li,Danwen Guo,Shanying He,Jiahao Kang,Yijuan Zhao,Shaohua Wu,Chunping Yang
Peroxymonosulfate-based advanced oxidation processes (PMS-based AOPs) via nonradical pathways have attracted close attention due to their excellent anti-interference properties and high selectivity in degrading organic pollutants from wastewater. However, the highly efficient production of nonradicals for PMS activation remains challenging, especially for recalcitrant organic pollutants such as tetracycline (TC) in complex aqueous matrices. Here, MnO and nitrogen-doped carbon catalysts were synthesized using NH 4 Cl modified strategy. The performances and mechanisms of TC degradation were evaluated, and toxicity of the system was also assessed. Results showed that the system achieved 86.7 % removal of TC within 30 min with a rate constant of 0.1713 min −1 . This system demonstrated effective TC degradation across a broad pH range (3.0–10.5) while exhibiting resistance to diverse anionic interferences in aqueous matrices. Characterization data showed that NH 4 Cl calcination led to a hierarchical porous structure with optimized MnO dispersion and nitrogen functionality in the carbon support, further significantly enhancing nonradicals generation through PMS activation. The key active sites were identified as Mn-N X sites, graphitic nitrogen, and C-O/C-N groups. Quenching experiments and ESR tests indicated that electron transfer and Mn(V) played the major role in TC degradation, followed by singlet oxygen ( 1 O 2 ). Based on LC-MS analysis of intermediates, three primary TC degradation pathways were identified: hydroxylation-driven ring-opening, oxidative demethylation/deamination, and oxidative ketonization. Toxicity assessment via the Toxicity Estimation Software Tool confirmed a significant reduction in ecotoxicity throughout these pathways. These data could be referred for the optimization of PMS-based AOPs in wastewater treatment.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Fuwei Gan,Wen Liu,Xinbao Zhang,Maochen Qian,Shaoguo Li,Yuzhong Wang,Junjie Li,Xiangxue Zhu,Xiujie Li
Primary amines, exemplified by n-butylamine, serve as critical intermediates in the synthesis of pharmaceuticals and agrochemicals. Amination of n-butanol with ammonia over supported cobalt catalysts represents a promising synthetic route. To enhance the catalytic performance of Co-based amination catalysts, we reported an acid-treated strategy that allows for precise regulation of cobalt speciation. Among the evaluated supports, silicalite-1 demonstrated superior amination performance, attributed to its unique ability to enhance cobalt dispersion and suppress acid-induced side reactions. Through acid treatment, oversized Co3O4 nanoparticles are selectively removed, thereby preserving highly dispersed cobalt species. Under rigorous reaction conditions (WHSV = 2.5 h-1), the acid-treated catalyst achieved 90% selectivity toward n-butylamine, accompanied by improved stability compared to untreated counterparts. Mechanistic investigations revealed that well-dispersed metallic Co0 nanoparticles promoted selective C-N bond formation via efficient coupling, whereas larger cobalt domains facilitated dehydrogenation-driven carbon deposition pathways. This work establishes a clear structure-performance relationship for cobalt-based amination catalysts, offering a blueprint for sustainable amine production.
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TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Baokai Zhang,Yanming Wang,Xian-Qiang Pei,Xiaoliang Zhang,Gai Zhao,Qihua Wang,Tingmei Wang
Solvent-free nanofluids have attracted increasing attention in tribological applications due to their distinctive load-bearing lubrication mechanisms, which arise from the synergistic interaction between its surrounding corona/canopy structures. In this study, a nanofluid was developed by incorporating N,S-co-doped carbon dots (N,S-CDs) and Jeffamine M2070 into polyimide (PI) matrix. This composite reduced the COF by 61 % (0.15 ± 0.01) and the wear rate by 95 % (3 ± 0.1643) × 10 −6 mm 3 /N·m compared to pure PI. N,S-CDs adsorbed onto friction surfaces via -NH 2 and -COOH groups, enhancing interfacial bonding and raising peak interface temperature by 126 K. This promoted PI fragment graphitization and robust tribofilms formation. M2070 further smoothed the interface by filling voids. The work proposes a “core-resin interface with casing” strategy for tribological materials in high-load, precision applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Xiaoling Liu,Sibin zhu,Shuodan Li,Letian Li,Xiaoming Zhu,Haolin Tang,Yadong Wang
Commercial Pt/C catalyst in Proton exchange membrane fuel cells (PEMFCs) usually suffers from Pt agglomeration, dissolution, and carbon support corrosion—exacerbated by Pt-catalyzed carbon oxidation. To address these challenges, composite supports combining high stability and electronic synergy with Pt have emerged as a promising solution. Herein, a platinum nanoparticle catalyst supported on a nitrogen-doped titania/carbon composite (Pt NPs/TiO₂-N/C) was successfully fabricated via a two-step hydrothermal method, aiming to optimize both oxygen reduction reaction (ORR) kinetics and durability through regulated support structures and interfacial interactions. Experimental results demonstrate that strong metal-support interactions (SMSI) between Pt and TiO₂-N/C play a critical role. On one hand, SMSI induces electron transfer from the support to Pt, enhances ORR kinetics. On the other hand, this interaction promotes preference nucleation and distribution of Pt on TiO₂-N surfaces, reducing direct Pt-carbon contact and effectively inhibiting Pt-catalyzed carbon corrosion, thereby improving durability. The Pt NPs/TiO₂-N/C catalyst exhibits excellent ORR activity with a half-wave potential of 0.842 V (vs. RHE) and remarkable stability, showing only a 33 mV decay in half-wave potential after 5000 accelerated degradation test cycles. This study validates that precise regulation of metal-support electronic interactions enables synergistic optimization of catalytic activity, stability, providing a theoretical basis and practical strategies for the rational design of high-performance PEMFC catalysts.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Hongqi Nie,Ruixuan Xu,Xin Li,Yuruizhi Lin,Suhang Chen,Kangzhen Xu,Jia-Rong Zhang,Qi-Long Yan
The combustion characteristics and energy output properties of solid propellants play a decisive role in rocket engine and propulsion system performance. Particularly for HTPB propellant systems incorporating CL-20 as the high-energy oxidizer, achieving wide-range burn rate regulation and maintaining low pressure exponents constitute fundamental requirements for practical implementation. Through advanced interfacial control methodology, this study successfully constructed two types of aluminum/oxidizer integrated composites (Al@AP and Al@CL-20), while employing precise catalysis to accurately distribute C 3 N 4 burn rate modifiers within the target oxidizer. This innovative approach has demonstrated significant enhancement in aluminum combustion efficiency within the composite propellant system. The strategic incorporation of C 3 N 4 , coupled with the optimized interfacial architecture between fuel and oxidizer components, establishes a new paradigm for performance modulation in solid propellant formulations. Thermal analysis (DSC/TGA) results reveal that both Al@AP/CN and Al@CL-20/CN composites exhibit concentrated exothermic characteristics, yet demonstrate fundamentally distinct heat release profiles. By strategically exploiting these differential energy release features, propellant formulations with tailored interfacial compositions and precisely engineered catalytic sites were developed. The modified propellants displayed markedly different combustion behaviors: the Al@CL-20/CN-based formulation achieved a 33% reduction in pressure exponent ( n =0.18) with significantly enhanced low-pressure burning rates, while the Al@AP/CN-modified system maintained ultra-low burning rates (<5 mm·s -1 ) but with high combustion efficiency across broad pressure ranges with an exceptionally low pressure exponent of 0.23. Complementary analysis of condensed combustion products (CCPs) confirmed substantial improvements in combustion completeness, showing a 78% reduction in micron-sized aluminum agglomerates and significantly refined CCPs particle size distribution. These findings collectively demonstrate that the synergistic combination of interfacial modification and precision catalysis effectively optimizes aluminum combustion efficiency and tunability of burn rate of high-energy HTPB propellants.
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AICHE JOURNAL
·
2025
·
IF 4
Bo Wang,Shuangjiang Li,Xiandong Hao,Wenbo Zhao,Zhiyong Xu,Yongming Luo
Traditional amine scrubbing for SO 2 capture typically dilutes alcohol amines with water to improve mass transfer, resulting in high volatility and desorption energy consumption. Inspired by the exceptional properties of ionic liquid (IL) 1-ethyl-3-methylimidazolium thiocyanate ([EMIM][SCN]), we herein propose substituting water with [EMIM][SCN] in a novel SO 2 absorbent system based on N -methyl ethanolamine (MDEA). MDEA acts as the primary SO 2 absorbent, while [EMIM][SCN] serves as an auxiliary absorption component and physical properties regulator. Performance evaluations reveal that MDEA-[EMIM][SCN] achieves high thermal stability (~483.15 K), low viscosity (~26 mPa s), excellent absorption capacity (~1.64 mol/kg at 298.15 K and 2000 ppm SO 2 ), high SO 2 /CO 2 selectivity (~101), and low desorption energy (approximately −95.6 kJ/mol). Thermodynamic modeling illustrates MDEA and [EMIM][SCN] contribute independently to absorption. Optimal energy consumption was determined by the proposed objective function. This work exemplifies the non-aqueous alkanolamine/IL system for SO 2 capture, offering a promising approach for developing efficient, low-energy SO 2 absorbents.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Yuhou Pei,Di Li,Yufeng Pei,Zongmiao Li,Yuting Liu,Xiang Ling,Yingying Lu,Bing Zhang
Urea synthesis by co-electroreduction of CO 2 and nitrate provides a promising strategy for sustainable fertilizer production. Despite advances in catalyst exploration, it is of significance to figure out the microenvironment on the electrode interface toward the kinetically matched C-N coupling. Here, we fabricated a hydrophobic triple-phase catalytic interface through a simply blending of commercial CuZn alloy and polytetrafluoroethylene (PTFE) particles for proof of concept. Incorporating PTFE boosted the Faradaic efficiency of urea from 8 % to 49 % and tripled the urea production rate. Kinetics and in-situ spectra studies reveal that hydrophobicity slows the proton/electron transfer during nitrate reduction, accelerates CO₂ diffusion at the triple-phase interface, and preserves high-valent asymmetric adsorption sites. This synergy extends the lifetime and surface coverage of critical C-/N-intermediates, and thus kinetically-matched asymmetric C-N coupling.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Zhiyue Cui,Hongli Fang,Xinyu Wei,Shu He,Wei Shao
Stimuli-responsive hydrogels have great prospects in many applications such as soft robots, smart actuators, and bionic devices. Among them, stimuli-responsive hydrogels as actuators possessing rapid responsiveness and tunable actuation remain challenging. In this work, asymmetric hydrogels with temperature and NIR light dual-responsive actuation were prepared by introducing polydopamine-modified molybdenum disulfide (PDA-MoS2) nanosheets into in situ polymerization of N-isopropylacrylamide (NIPAM) monomers by the gravity-induced deposition method. The PDA-MoS2 nanosheets existing in the PNIPAM hydrogels had synergistic reinforcing NIR light responsiveness, making the prepared hydrogel exhibit a fast bending ability that it could bend to 249° in 17 s. The hydrogel showed excellent bending performance with a bending angle of 601° in 16 s in 55 °C water. On this basis, several biomimetic actuators, including the catch-release of a smart gripper, the opening and closing of a hydrogel flower, and the bending of butterfly tentacles and light-driven circuit switches were developed. In addition, smart devices such as information-hiding materials and fluid valves were constructed through the combination of temperature and NIR light dual-responsiveness. These dual-driven asymmetric hydrogels provide ideas for the design and development of smart actuators and broaden the application of hydrogel actuators in the emerging fields of soft robotics, biomedical engineering, and bionic devices.
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