Journal of Water Process Engineering
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2025
·
IF 6.7
Yongzhi Tu,Ziming Zhang,Peien Huang,Jiale Zou,Zhi Xiong,Meiting Zheng,Zhifei Ma,Jianxin Chen
Unlike conventional Fe₃O₄-MnO₂ composites, an architecture-engineered Fe₃O₄-MnO₂ (FM-21) heterostructure was constructed by anchoring Fe₃O₄ nanoparticles onto α-MnO₂ nanorods. Under visible light irradiation, the FM-21/PDS system achieves 96.5 % Orange II degradation within 60 min with a kinetic rate constant of 0.0596 min −1 , significantly outperforming its individual components and dark condition controls. Multiple characterization techniques confirm that the unique interfacial configuration establishes a direct Z-scheme charge transfer pathway, substantially enhancing charge carrier separation efficiency. XPS analysis provides direct evidence that visible light accelerates the co-cycling of Fe 3+ /Fe 2+ and Mn 4+ /Mn 3+ redox pairs, thereby maintaining highly efficient PDS activation. Quenching experiments and EPR analysis further reveal that the synergistic effect between radical and non-radical pathways, which is dominated by singlet oxygen ( 1 O₂) and holes (h + ), drives the degradation process. This mechanism enables the degradation of various pollutants with minimal dependence on their charge characteristics, demonstrating the catalyst's broad applicability. The catalyst also exhibits practical advantages including magnetic separability and stable performance over five consecutive cycles. This study demonstrates that the synthesized FM-21 exhibits significant potential for visible light-enhanced PDS activation in eliminating recalcitrant organic pollutants.
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Environmental Technology & Innovation
·
2025
·
IF 7.1
Lei Zheng,Rongzhen Ma,Hong Liu,Changsheng Jiang,Cheng Song
A microfluidic-fluorometric platform integrated with carbon dots was developed for the real-time and sensitive detection of Chromium(VI) (Cr 6 + ). Chitosan and o-Phenylenediamine were used as precursors to synthesize nitrogen-doped carbon dots (OPD-CDs) via a solvothermal method. The OPD-CDs exhibited a monodisperse spherical nanostructure with an average diameter of 3.86 ± 0.09 nm, a quantum yield of 36.77 %, and a surface enriched with amino and carboxyl functional groups. Cr 6+ induced selective fluorescence quenching through a charge transfer mechanism, where electron donation from surface amines suppressed radiative recombination, accompanied by emission red-shift and increased Stokes shift. Furthermore, quenched OPD-CDs was able to restore fluorescence by adding H 2 O 2 . OPD-CDs demonstrated a detection limit of 0.73 μM and a linear range of 0.2–210 μM under the conventional spectrofluorometry. When incorporated into a microfluidic chip, the OPD-CDs integrated platform achieved a rapid response within 1 min, a detection limit of 1.04 μM, and high selectivity against 26 potential interfering ions. Spike-recovery tests in tap and river water samples yielded recoveries of 98.6–104.7 % (RSD ≤ 2.2 %), confirming its practicality for on-site water quality monitoring. This study innovatively merges optoelectronics features of carbon dots with the microfluidic miniaturization, enabling portable and real-time monitoring of Cr 6+ , which highlights critical needs for rapid detection of heavy metals in accidental pollution events and water quality surveillance.
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JOURNAL OF THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Ruotong Cui,Wenlong Xu,Feng Liu,Lei Yu,Jiming Liu,Xi Chen,Yingyun Qiao,Yuanyu Tian
The structure and reactivity of coal is the core problem of coal chemistry, and solving it at the molecular level has been an international unsolved problem. The chemical similarity-based coal chemistry group elevates the study from the macroscopic to the molecular level. However, the previous free radical mechanism lacks experimental confirmation and theoretical computational support. Here, the pyrolysis products of model compounds are first utilized to predict pyrolysis. The hydrogen-donating solvent is then used as a radical trap to confirm the reaction. Subsequently, density functional theory calculations are utilized to aid in the validation. Finally, family components are utilized to demonstrate the universality of the free radical mechanism of coal pyrolysis. This work combines radical trapping with quantum chemical calculations to analyze the radical reaction mechanism of coal pyrolysis in depth at the molecular level. This will provide a theoretical basis for coal pyrolysis and clean and efficient utilization.
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Journal of Energy Storage
·
2024
·
IF 8.9
Qing Xu,Pengcheng Cai,Xuanyuan Ni,Yunxing Zhao,Denian Li,Yong Chen,Haoran Yuan
Electronic-double-layer supercapacitors (EDLC) usually use activated carbon with large specific surface area and abundant pore structure as the electrode active material for adsorption/desorption of electrolyte ions. Featuring huge yield, low price, multi-level structure, and inherent heteroatoms/functional groups, biomass-derived activated carbon has been demonstrating excellent specific capacitance, low electrochemical impedance, and long-term durability in supercapacitor applications. Loofah sponge is an ideal precursor for activated carbon because of its unique cross-linked parallel channel structure that facilitates ion transfer and storage in supercapacitor. Upon pre‑carbonization combined with KHCO 3 -incorporated activation pyrolysis in this study, the loofah sponge is transformed into a three-dimensional hierarchical porous structured carbon (LC-K1–800), while retaining the primary skeleton and heteroatoms (oxygen and nitrogen) of the biomass. The specific capacitance of LC-K1–800 at a current density of 0.2 A g −1 is measured to be 344 F g −1 , and that at a current density of 1 A g −1 is 296 F g −1 . Moreover, the symmetric two-electrode device assembled by the LC-K1–800 has a specific capacitance of 216 F g −1 at the current density of 0.2 A g −1 and a capacitance retention rate of 103.4 % after 10,000 charge/discharge cycles at the current density of 10 A g −1 , showcasing exceptional cycling stability. Additionally, the symmetric supercapacitor assembled with 1 M Na 2 SO 4 electrolyte has achieved an energy density of 18 Wh kg −1 in a 1.6 V voltage window. The impressive performance of the LC-K1–800 assembled EDLC is derived from the well-developed hierarchical porous structure, robust carbon skeleton, high specific surface area, as well as the superior hydrophilicity of loofah sponge-derived activated carbon. This work provides an outstanding option for high-performance and cost-effective carbon-based EDLC.
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Journal of the American Chemical Society
·
2024
·
IF 14.4
Liu Lin,Yunming Xu,Yiting Han,Ruikun Xu,Tongyue Wang,Zemin Sun,Zhenhua Yan
A deep understanding of the mechanism for the spin-magnetic effect on O–H cleavage is crucial for the development of new catalysts for water oxidation. Herein, we designed and synthesized the crystalline Fe-DABDT and Co-DABDT (DABDT = 2,5-diaminobenzene-1,4-dithiol) and optimized an effective magnetic moment to explore the role of the spin-magnetic effect in the regulation of water oxidation activity. It can be found that the OER activity of the catalyst is positively correlated with its effective magnetic moment. Under the external magnetic field, Fe-DABDT with more spin single electrons has a stronger spin-magnetic response to water oxidation than Fe/Co-DABDT and Co-DABDT. The increase in OER current of Fe-DABDT is nearly 2 times higher than that of Co-DABDT. Experimental and density functional theory studies show that magnetized Fe sites could realize nucleophilic reaction, accelerate the polarization of electron spin states, and promote the polar decomposition of O–H and the formation of the O–O bond. This study provides mechanistic insight into the spin-magnetic effect of oxygen evolution reaction and further understanding of the spin origin of catalytic activity, which is expected to improve the energy efficiency of hydrogen production.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Haimei Zhong,Yiwen Wang,Qinliang Jiang,Huali Tian,Cheng Jiang,Pei Han,Yingying Qin,Lixiang Li,Shuanglin Gui
The trade-off between permeability and selectivity, along with the issue of membrane fouling, has constrained the widespread application of ultrafiltration (UF) membranes in recycling rare earth wastewater. Here, we present the incorporation of tannic acid (TA) modified molybdenum disulfide oxide (O-MoS 2 ) as a functional enhancer to fabricate polyethersulfone (PES) based mixed matrix membranes through a nonsolvent induced phase separation (NIPS) approach. Compared to the unmodified PES membrane, the integration of TA-O-MoS 2 significantly improves the hydrophilicity, porosity in the mixed matrix membrane. By altering the concentration of TA-O-MoS 2 , the TA-O-MoS 2 /PES UF membrane achieves enhanced hydrophilicity and charge properties, resulting in a remarkable improvement in separation performance. Specifically, the optimized membrane M2 (TA-O-MoS 2 addition of 0.1 wt%) exhibits a water flux of 140.98 Lm −2 h −1 bar −1 and a PEG 20000 rejection rate of 91.00 %, representing increases of 180 % and 120 % over the control PES membrane, respectively. Notably, membrane M2 effectively retains 91.31 % of macromolecular organic compounds in rare earth wastewater, while permitting nearly complete passage of inorganic salts, for instance CaCl 2 (3.26 %) and MgSO 4 (4.84 %). Moreover, the TA-O-MoS 2 /PES membrane demonstrates robust antifouling properties and exceptional durability, indicating its significant potential for efficient treatment and resource recovery in rare earth wastewater.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 30
·2202245
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IF 19.924
Tingting Liang,Xiaqing Zhang,Lijun Su,Ruilin Hou,Bingjun Yang,Junwei Lang,Shengrong Yang,Xingbin Yan
Perovskite materials can store charge through rapid oxygen anions intercalation. Although numerous perovskite materials owing to rich selections of A and B-site elements are reported as electrodes of supercapatteries, the effect of the crystal structure of perovskite materials on their electrochemical performance has never been studied so far. Herein, using SrCo 0.9 Mo 0.1 O 3− δ , SrFeO 3− δ , Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ , and LaMnO 3− δ as research targets, it is proved that their corresponding cubic structure materials display the best electrochemical performance. And then, the origin of such superiority of cubic structure for SrCo 0.9 Mo 0.1 O 3− δ is explored through experimental investigations and theoretical calculations. The results show that the increase in the content of oxygen vacancies and the enhancement of B-O hybridization of cubic structure can optimize the electronic structure of the perovskite materials, thereby improving its conductivity and accelerating the reaction kinetics. The filtering strategy based on crystal structure proposed by this report will provide a new perspective to faster and more efficient choice of perovskite materials for supercapatteries.
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Advanced Energy Materials
·
2023
·Vol. 13
·期 27
·2300746
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IF 27.8
Yaoshen Niu,Zilin Hu,Bo Zhang,Dongdong Xiao,Huican Mao,Lin Zhou,Feixiang Ding,Yuan Liu,Yang Yang,Juping Xu,Wen Yin,Nian Zhang,Zhiwei Li,Xiqian Yu,Hao Hu,Yaxiang Lu,Xiaohui Rong,Ju Li,Yong-Sheng Hu
Na-ion batteries (NIBs) are promising for grid-scale energy storage applications. However, the lack of Co, Ni-free cathode materials has made them less cost-effective. In this work, Mg 2+ is successfully utilized to activate the oxygen redox reaction in earth-abundant Fe/Mn-based layered cathodes to achieve reversible hybrid anionic and cationic redox capacities. A high first charge capacity of ≈210 mAh g −1 with balanced charge–discharge efficiency is achieved without O-loss, showing a promising energy cost of $2.02 kWh −1 . Full cell against hard carbon anode without pre-sodiation shows energy density exceeding ≈280 Wh kg −1 with a decent capacity retention of 85.6% after 100 cycles. A comprehensive analysis of the charge compensation mechanisms and structural evolution is conducted. Voltage and capacity loss resulting from partially reversible Fe 3+ migration to the Na layer is confirmed, shedding light on further improvements for low-cost NIB cathodes in application scenarios.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Ye Chen,Xiaokang Sha,Junpo Guo,Xupo Liu,Meinan Chang,Jiayao Qiu,Jingru Zhang,Bowen Cai,Jiashu Tang,Yi Liu,Huaiyu Shao,Deli Wang
Rational design of heteroatom-doped catalysts with prominent reaction kinetics holds immense potential for enhancing biomass electrooxidation processes. Here, we introduce a F-doped NiO nanosheet architecture enriched with F-Ni δ+ -O coordination motifs as an advanced electrocatalyst for the oxidation of 5-hydroxymethylfurfural (HMF). XPS depth profiling and differential charge density calculations reveal that the distinctive F-Ni δ+ -O configuration induces asymmetric charge redistribution at Ni sites, effectively reducing the activation energy for Ni 3+ OOH species and their subsequent interaction with HMF. Meanwhile, pH-dependent and in-situ Raman measurements demonstrate that F sites function as proton relays, facilitating proton transfer and enabling efficient proton-coupled electron transfer kinetics. The synergistic electronic and proton effects endow excellent catalytic performance, with an oxidation current density of 66.45 mA cm −2 and a reaction rate of 5.23 × 10 −4 s −1 , far higher than that of the original NiO. Notably, the catalyst retains over 95 % Faradaic efficiency and yield of 2,5-furandicarboxylic acid (FDCA) after twenty consecutive cycles. This work establishes a dual regulation strategy via heteroatom doping to simultaneously modulate electronic configuration and proton transfer dynamics, offering novel insights into the design of high-performance electrocatalysts for biomass valorization.
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Journal of Energy Storage
·
2025
·
IF 9.8
Sikai Zhang,Rui Yin,Zhilong Tan,Minghai Zhao,Peng Zhou,Pei He,Runjing Zhang,Ziyan Wang,ZhiFeng Huang,Hai Hu,Li Liu
The mixed phosphate Na₄Fe₃(PO₄)₂(P₂O₇) (NFPP) via synergistic coordination of mixed [PO₄]/[P₂O₇] anion groups achieves a flat voltage plateau at 3.2 V (vs. Na + /Na) and a theoretical specific capacity of 129 mAh g −1 , but its practical application is still limited by its inherent low electronic conductivity. Through structural integration of polyanion-type cathode materials, this study innovatively designed and constructed hierarchical Na₄Fe₃(PO₄)₂(P₂O₇)@C mesoporous microspheres (NFPP@CMMS). The NFPP nanocrystals uniformly embedded in a three-dimensional interconnected meso porous carbon matrix (pore size distribution: 2–5 nm). Such hierarchical meso/micro-nano architectures provided expansive ion-exchange interfaces, accelerating Na + de/intercalation kinetics while enhancing electronic conductivity and mitigating structural collapse during cycling. Consequently, the NFPP@CMMS delivers exceptional reversible discharge capacity (121 mAh g −1 at 0.1C), outstanding rate capability (72 mAh g −1 at 50C), and superior cycling stability (90.70 % capacity retention after 3500 cycles at 5C). This triple-synergy strategy—combining nano-confinement effects, interconnected mesoporous channels, and carbon-encapsulated network—provides a novel pathway for developing practical sodium-ion battery cathodes.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 10
·1-14
·
IF 2.8
Ning Qiyun,Li Bingwei,Zhou Wang,Xu Xiaoting,Li Jun
In this study, Bi₂O₂Se nanosheets were synthesized via a hydrothermal method, and a Bi₂O₂Se/WSe₂ heterostructure was subsequently constructed using a mechanical compounding approach to develop a photoelectrochemical photodetector. By optimizing the mass ratio and KOH electrolyte concentration, the Bi₂O₂Se/WSe₂ heterostructure exhibited optimal performance at a 7:1 ratio in 0.1 M KOH. Benefiting from the interfacial heterojunction between the two materials, the Bi₂O₂Se/WSe₂ heterostructure achieved a photocurrent density of -2.74 µA/cm² under zero external bias, representing an order-of-magnitude enhancement compared to pristine Bi₂O₂Se nanosheets. Concurrently, the rise time was significantly reduced from 0.86 s to 0.28 s, And the decay time decreased from 4.85 s to 0.32 s, demonstrating superior self-powered characteristics. Furthermore, the Bi₂O₂Se/WSe₂ heterostructure exhibited a maximum photoresponsivity of 61 µA/W. The optimized Bi₂O₂Se/WSe₂ photodetector showed no notable performance degradation during a 10,000 s cyclic on/off illumination test. This work highlights the immense potential of the Bi₂O₂Se/WSe₂ heterostructure-based self-powered photodetector in delivering exceptional self-driven functionality, outstanding optoelectronic properties, and robust stability for practical applications.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Yaoyu Yan,Shuchen Sun,Jing Wei,A. Shubo,Faxin Xiao,Ganfeng Tu
Electrolytic manganese residue (EMR), a hazardous solid waste from electrolytic manganese metal (EMM) production, poses serious environmental risks due to its complex mineralogy and heavy metal mobility. However, it also holds potential as a secondary resource. We establish an end-to-end waste-to-materials flowsheet—sulfuric-acid curing → water leaching → impurity removal → one-step conversion—that selectively recovers Mn from EMR and upgrades it to phase-pure, high-value Mn₃O₄ nanomaterials. The effects of curing temperature and acid dosage on the leaching behaviors of Mn, Fe, Al, and Si were systematically investigated. At 240 °C and an acid dosage of 2.5 times the stoichiometric requirement, Mn leaching efficiency reached 95.35 %, while Si leaching remained below 50 % due to silicate encapsulation and gelation. Kinetic modeling using the shrinking core model revealed that Mn dissolution was primarily controlled by product-layer diffusion, with an apparent activation energy of 14–18 kJ·mol −1 . FTIR, XRD, SEM–EDS, and BET analyses showed that acid curing disrupted the dense silicate matrix and increased surface area from 9.4 to 55.6 m 2 ·g −1 . Mn 2+ in the purified leachate was directly precipitated and oxidized using an NH₃·H₂O–H₂O₂–EDTA system, producing uniformly sized Mn₃O₄ nanoparticles. Rather than a stand-alone synthesis, the impurity-tolerant process with defined operating windows is the core contribution, with the Mn₃O₄ product validating this waste-to-value pathway. This integrated route offers a scalable framework for hazardous-waste valorization while clarifying sulfuric-acid-curing transformation and leaching kinetics, advancing sustainable metal recovery.
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