Polymers
·
2026
·Vol. 18
·期 6
·772
·
IF 5.8
Qianyi Wang,Guohan Wang,Sasa Ma,Zichen Wang,Lijie Luo,Yongjun Chen
The widespread use of plastics has inevitably led to the accumulation of persistent plastic debris in aquatic systems, where gradual fragmentation generates microplastics (MPs) that threaten ecological and biological health. Their small size, chemical stability, and resistance to degradation make effective removal particularly challenging. In this work, a composite adsorbent was fabricated through the in situ solvothermal growth of Materials of Institute Lavoisier 100 (Iron) (MIL-100(Fe)) onto coconut shell-derived activated carbon (CSAC), yielding a monolithic material denoted as CSAC@MIL-100(Fe). The integration of porous C with a metal–organic framework created a hierarchically structured adsorbent rich in accessible binding sites. The composite achieved a maximum polystyrene (PS) removal efficiency of 97.4% and maintained 91.44% efficiency after seven regeneration cycles. Stable adsorption performance was observed across a broad pH range. Structural and chemical analyses (scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS)) combined with adsorption modeling revealed heterogeneous multilayer adsorption behavior consistent with the Freundlich isotherm and pseudo-second-order kinetics. π–π interactions, electrostatic attraction, and coordination effects jointly governed PS capture. The Langmuir maximum adsorption capacity reached 746.27 mg/g. These findings demonstrate a practical and recyclable strategy for efficient MP remediation in aquatic environments.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122571
·
IF 7.5
Fei Meng,Muhammad Haris Khan,Shafqat Ali,Zareen Zuhra,Dugang Chen,Zhaowei Zhang
The environmental persistence and potential toxicity of microplastics have raised serious concerns regarding their impacts on aquatic ecosystems and human health. Herein, a Z-scheme heterojunction photocatalyst, MIL-53-NH 2 (Fe)/Bi 2 WO 6 , was rationally constructed to promote directional charge separation and enhance redox reactivity under light irradiation. Interfacial coupling between MIL-53-NH 2 (Fe)/Bi 2 WO 6 facilitates an efficient Z-scheme charge-transfer pathway, preserving the strong oxidation ability of photogenerated holes on Bi 2 WO 6 and the high reduction potential of electrons on MIL-53-NH 2 (Fe). When coupled with peroxymonosulfate (PMS), the heterojunction effectively activates PMS via electron-mediated pathways, leading to the generation of reactive oxygen species (ROS), primarily sulphate radicals (SO 4 •⁻ ), accompanied by the generation of hydroxyl radicals ( • OH) and superoxide radicals( • O 2 ⁻ ). As a result, polystyrene (PS) microplastics undergo accelerated oxidative chain scission, surface oxidation, and mass loss, achieving a weight reduction of 45.36% in the presence of 5 mM PMS. Radical quenching experiments and electron paramagnetic resonance (EPR) spectroscopy collectively confirm the dominant role of PMS-derived ROS and validate the proposed Z-scheme-driven degradation mechanism. This study elucidates the synergistic interplay between heterojunction charge dynamics and PMS activation, offering mechanistic insights into the design of efficient photocatalytic systems for microplastic degradation in aquatic environments.
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International Journal of Environmental Research
·
2026
·Vol. 20
·期 6
·302
·
IF 4.3
Jinkui Zhong,Runyujie Ma,Caiya Zhu,Lina Yang,Li Liu,Xiaowen Li,Jing Chen,Yaxin Hu,Xuewen Zhu
Phenolic compounds are widespread industrial pollutants that threaten aquatic ecosystems and human health. Herein, carbon nanotube-supported Fe₃O₄-loaded nano-zero-valent iron (CNTs-Fe₃O₄-nZVI) composites were synthesized via liquid-phase reduction and employed as heterogeneous Fenton-like catalysts with H₂O₂ to degrade bisphenol F (BPF) and bisphenol S (BPS) in aqueous solution. The effects of H₂O₂ concentration, catalyst dosage, and initial pH on degradation efficiency were systematically investigated, and reaction conditions were optimized using the Box-Behnken response surface methodology (RSM). Results showed that at 25 °C, pH 3.0, a catalyst dosage of 0.8 g L⁻ 1 , and H₂O₂ concentrations of 10 mmol L⁻ 1 (for BPF) and 15 mmol L⁻ 1 (for BPS), the degradation efficiencies of BPF and BPS reached 98.03% and 94.30%, respectively, in good agreement with the model-predicted values (96.94% and 93.92%). After four reuse cycles, the degradation efficiencies remained above 70%, confirming good stability and reusability. Isotherm data fitted the Freundlich model better than the Langmuir model for both BPF ( R 2 = 0.9484) and BPS ( R 2 = 0.9091), with negative intercepts indicating multilayer adsorption on heterogeneous surfaces. The adsorption affinity for BPF ( K F = 8.25) was nearly double that for BPS ( K F = 4.37), revealing structure-dependent interfacial interactions. Radical quenching and mass spectrometry indicated HO· oxidation and benzene ring cleavage as the primary BPS degradation pathways. The optimized conditions were determined as H₂O₂ 10.74 mmol L⁻ 1 , catalyst 0.733 g L⁻ 1 , and pH 2.836 by RSM. TOC removal reached 64.22% for BPF and 67.97% for BPS, and ecotoxicity assessment confirmed that the degradation intermediates exhibited substantially reduced toxicity, demonstrating effective detoxification.
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NUCLEAR TECHNOLOGY
·
2025
·
IF 2
Qianwen Wang,Dingcheng Wang,Jinfeng Li,Bo Tian,Zhigang Li,Jianwei Zhang,Wenze Li,Nan Zhang,Yunchen Du,Hongtao Zhao
The extraction and recovery of uranium play a crucial role in ensuring the sustainable supply of nuclear energy and safeguarding environmental security. The ideal uranium adsorbent should have high adsorption capacity, excellent selectivity, and good reusability. In this study, by employing the strategy of using MIL-100(Fe) as an intermediate linker, the core shell, structured of Fe3O4@NiFe-LDH, was successfully accomplished via a solvothermal method. The as-prepared Fe3O4@NiFe-LDH shows great potential in the field of uranium adsorption.On one hand, MIL-100(Fe) can act as an iron source for NiFe-LDH, making the core-shell structure more stable. It was observed that after four adsorption-desorption cycles, the adsorption efficiency of Fe3O4@NiFe-LDH could still reach 75% in the fifth cycle. By contrast, materials without the MIL-100(Fe) intermediate layer exhibited a relatively lower adsorption cycle efficiency for three cycles. On the other hand, the porous structure of metal organic framework (MOF) doubles the specific surface area of Fe3O4@NiFe-LDH compared to Fe3O4/NiFe-LDH without a MOF intermediate layer.The abundant hierarchical pore structure further enhances the performance of Fe3O4@NiFe-LDH from 615.6 mg·g−1 of Fe3O4/NiFe-LDH(8:1) to 862 mg·g−1. Additionally, in-depth studies on adsorption kinetics and adsorption thermodynamics suggest that the adsorption process is more inclined to monolayer adsorption and is dominated by chemical adsorption, which is a spontaneous endothermic process. When conducting ion competition tests on the adsorbent, it was found that the adsorbent has high adsorption selectivity for U(VI) and good regeneration ability. Therefore, the addition of the intermediate MOF improves the adsorption capacity and stability of the material, indicating that Fe3O4@NiFe-LDH has potential advantages in practical applications.
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DESALINATION
·
2025
·
IF 9.8
Shuyu Liu,Liang Tian,Lihua Han,Qing Li,Liangliang Zhu,Su Chen
The conversion of waste plastics into metal-organic framework (MOF) photothermal materials presents promising opportunities for solar energy conversion, facilitating freshwater production and water purification through interfacial solar evaporation, and simultaneously heralding advancements in plastic waste recycling. Herein, we present a bimetallic Co/Fe-MOF photothermal converting material derived from PBAT-based plastic wastes, tailored for efficient solar water evaporation. The nanosheet-structured bimetallic Co/Fe-MOF featuring high light absorption, water wettability and photothermal conversion efficiency delivers an optimal evaporation rate of 1.81 kg m −2 h −1 under one sun irradiation, surpassing that of monometallic MOFs. Moreover, we employed three substrates—nanofiber film, aerogel, and hydrogel—to immobilize the Co/Fe-MOF solar absorbers, thereby constructing monolithic hybrid solar evaporators. These substrates not only confer the flexibility to Co/Fe-MOF solar absorbers for practicability but also serve as mediates to regulate thermal management and water states. Consequently, the hybrid evaporators exhibited significantly enhanced evaporation rates, with the hydrogel evaporator achieving to ~3.53 kg m −2 h −1 , coupled with remarkable salt resistance and durability. This bimetallic Co/Fe-MOF-based solar evaporator efficiently serves a dual purpose, enhancing clean water production through solar desalination and purification while also presenting a viable alternative to the issue of plastic waste, potentially harmonizing energy, environment and clean water nexus.
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Catalysts
·
2025
·Vol. 15
·期 10
·934
·
IF 4
Zupeng Gong,Shixuan Ding,Mingjie Huang,Wen-da Oh,Xiaohui Wu,Tao Zhou
This study presents the preparation of iron and nitrogen co-doped sludge-based biochar (FeCN-MSBC) and iron oxide-doped biochar (FeO-MSBC) by ball milling municipal sludge with different iron precursors (K3Fe(CN)6and Fe2O3), followed by pyrolysis. These biochars were utilized to activate persulfate (PMS) for the degradation of phenolic pollutants. The results demonstrate that FeCN-MSBC, formed by the introduction of K3Fe(CN)6, contains Fe/N phases, with surface Fe sites exhibiting a lower oxidation state, which significantly enhances PMS activation efficiency. In contrast, FeO-MSBC, due to the aggregation of Fe2O3/Fe3O4, shows relatively lower catalytic activity. The FeCN-MSBC/PMS system degrades pollutants via a synergistic mechanism involving non-radical pathways mediated by1O2and electron transfer processes (ETP) catalyzed by surface Fe. Electrochemical oxidation and quenching experiments confirm that ETP is the dominant pathway. FeCN-MSBC, prepared at a pyrolysis temperature of 600 °C and an Fe loading of 3 mmol/g TSS, exhibited the best performance, achieving a phenol degradation rate constant (kobs) of 0.127 min−1, 4.5 times higher than that of undoped biochar (MSBC). FeCN-MSBC/PMS maintained high efficiency across a wide pH range and in complex water matrices, exhibiting excellent stability over multiple cycles, demonstrating strong potential for practical applications. This study provides an effective strategy for simultaneous Fe and N doping in sludge-derived biochar and offers mechanistic insights into Fe/N synergistic activation of PMS for practical water treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Rui Ming,JingJing Du,Shaobo Ye,Zhao Liang,Qiao Liu,Xuyang Lu,Qiliang Wei,Weiyou Yang,Qing Shi
The design of efficient and cost-effective bifunctional catalysts to replace precious metal-based catalysts remains a critical challenge in electrocatalytic water splitting. Herein, we report a Mo-Fe co-doped Ni 3 S 2 nanorod arrays grown on a nickel-iron foam substrate via a facile hydrothermal synthesis. This dual metal-doped nanorod structure synergistically modulates the electronic structure while maximizing accessible active sites, endowing the Mo-Fe-Ni 3 S 2 electrode with exceptional bifunctional activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media. The resulting Mo-Fe-Ni 3 S 2 electrode requires only 180 mV for HER and 275 mV for OER at a current density of 100 mA cm −2 , coupled with long-term stability exceeding 50 h. Remarkably, when integrated into a single-stack cell for practical application, the Mo-Fe-Ni 3 S 2 electrode exhibits outstanding performance, achieving a current density of 100 mA cm −2 at a potential of 1.87 V and showing no potential degradation after 100 hours of continuous operation at 100 mA cm −2 . This work not only presents a high-performance bifunctional catalyst but also provides fundamental insights into the design of advanced electrocatalysts through rational heteroatom doping strategies.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Junhao Huang,Ruixue Shi,Andrei Ivanets,Alexander A. Ratko,Tatyana Kouznetsova,Haixin Wu,Xintai Su
Hexavalent chromium (Cr(VI)) contamination in water poses a significant threat to human health. In this work, Fe and N co-doped biochar (Fe-N-C) was fabricated from municipal sludge using urea as a nitrogen source via the acidification-one-step pyrolysis method. This approach overcame the low adsorption capacity of self-carbonated sludge and achieved high Cr(VI) removal efficiency. Batch experiments and characterization techniques were employed to investigate the synthesis mechanism of Fe-N-C and its Cr(VI) removal mechanisms. At a urea/sludge mass ratio of 0.5, Fe-N-C-0.5 demonstrated superior Cr(VI) adsorption capacity (205.92 mg g⁻¹), primarily governed by spontaneous monolayer chemisorption and intraparticle diffusion. The adsorption process was unaffected by coexisting ions, and it exhibited excellent regeneration stability as well as substantial potential for practical applications. In addition, Fe-N-C-0.5 exhibited high biosafety before and after Cr(VI) removal. Urea doping facilitated nitrogen incorporation and anchored free Fe³⁺, forming the Fe-N-C structure that promoted the transformation of Cr(VI) to Cr(III) through electrostatic adsorption, reduction, and cation-π interactions. These results suggest Fe-N-C is an effective adsorbent for Cr(VI)-contaminated wastewater treatment.
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LANGMUIR
·
2026
·
IF 4.4
Yifeng Wang,Xinpeng Chen,Ziwei Wu,Guoqiang Chen,Tieling Xing
Conventional photocatalysts suffer from rapid electron–hole recombination, severely limiting their practical application in wastewater treatment. Moreover, many organic degradation systems require the addition of hydrogen peroxide or persulfate to enhance photocatalytic activity, but this not only often leads to secondary pollution but also results in low oxidant utilization efficiency. To overcome this fundamental constraint, a novel direct Fe-based Metal–Organic Frameworks (Fe-MOF)/BiOBr heterojunction was innovatively constructed via hydrothermal synthesis. Without the need for additional oxidizing agents, this catalyst relies solely on light energy to initiate and maintain the photocatalytic degradation reaction. The optimized MIL-101/BiOBr composite demonstrated outstanding performance, achieving over 99% degradation of Rhodamine B (RhB) within 60 min under UV light, retaining an 88% degradation rate at an ultrahigh dye concentration (80 mg/L), and maintaining exceptional cycling stability (89.57% after 5 cycles). Mechanistically, ESR/trapping experiments identified h+ and ·O2– as the dominant species, while comprehensive characterization (SEM, XRD, XPS, BET) and photoelectrochemical analyses confirmed the successful preparation of the heterojunction. Furthermore, density functional theory (DFT) calculations combined with the analysis of degradation intermediates allowed the prediction of the Rhodamine B degradation pathway from both theoretical and experimental perspectives. The catalyst also exhibited versatile degradation capability, efficiently removing methylene blue (73.1–97.7%) and tetracycline with accelerated kinetics. Overall, the Fe-MOF/BiOBr synthesized in this study represents a photocatalytic material with significant practical potential for wastewater degradation thanks to its innovative advantages such as light-driven operation, high electron–hole separation efficiency, stable performance, broad organic degradation capability, and well-elucidated degradation pathways.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yuhuan Wu,Chengwen Feng,Yuyao Peng,Lu Liang,Qingqing Jiang,Xujing Guo
An activated carbon loaded Fe–Co nanometer material (AC/Fe–Co) was synthesized for catalytic degradation of coking wastewater. Synchronous fluorescence (SFS), Fourier transform infrared spectroscopy (FTIR) combined with two-dimensional correlation spectroscopy (2D-COS) were used to reveal the degradation of fluorescent components in coking wastewater dissolved organic matter (DOM). The results showed that nano-AC/Fe–Co catalyst can degrade coking wastewater in a broad range of pH (3–11). Total organic carbon (TOC) removal rate can reach 85.46%, and more than 86.00% of fluorescent components in DOM can be removed by nano-AC/Fe–Co catalyst. The result of 2D-SFS-COS indicated that the change sequence of these components was in the following order: 490, 400, 335, 325, 365, 380, 430, 273, 285, and 265 nm, indicating that humic-like at long wavelength (e.g. 490 nm and 400 nm) can be degraded preferentially, followed by fulvic-like (e.g. 335 nm, 325 nm, 365 nm, and 380 nm), humic-like (430 nm) and protein-like substances. Meanwhile, the preferential sequence of functional groups was in the following order: 1700–1900, 1548, 1080, 1214, 1010, 1652, 1140, and 1365 cm −1 . The result of moving window 2D-COS (MW2D-COS) showed that protein-, fulvic- and humic-like substances can also be removed within 0 to 30 min, which have occurred the transition at about 20 min. TOC removal rate by nano-AC/Fe–Co catalyst can reach more than 60.00% after three times reuse, suggested an excellent repeatability and stability. Herein, spectroscopic techniques in combination with 2D-COS can be used as feasible approaches to reveal the catalytic degradation characteristics of DOM in actual coking wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Kunyu Chen,Jie Wang,Xiaoxiang Cheng,Weikang Zhang,Jingwei Huang,Congwei Luo,Xinsheng Luo,Peijie Li,Yan Jin,Daoji Wu,Ruimin Mu,Jinsuo Lu
The CaSO 3 /Fe(VI) system was demonstrated to efficiently degrade emerging contaminants under alkaline conditions. However, the integrated impacts of pH-driven mechanisms remain to be fully elucidated. The present study investigated the degradation of sulfonamide antibiotics (SAs) in both buffer solution (BS) and deionized water (DW) by conducting comparative experiments under varying pH conditions, evaluating the pH-driven degradation efficiency and mechanisms, and clarifying the integrated impacts of pH variations in the CaSO 3 /Fe(VI) system. The results indicated that pH significantly influenced the degradation performance and kinetics of the CaSO 3 /Fe(VI) system toward SAs, identifying neutral pH as the optimum condition. The dynamic increasing in pH in DW enhanced the oxidation capacity under acidic conditions. In neutral and alkaline conditions, Fe(V) was the primary active species, while alkaline conditions favored radical generation. Conversely, acidic conditions favored the formation of Fe(IV) as the predominant species. Furthermore, the active sites of SAs were identified, and degradation pathways were proposed, confirming that the process simultaneously achieves contaminant removal and toxicity reduction. In terms of engineering implications, the CaSO 3 /Fe(VI) system offers a highly competitive treatment cost of only 0.45 CNY/m 3 , while also reducing chemical dosage requirements in potential processes such as coagulation and disinfection. Moreover, the end products SO 4 2− and Fe(III) both promote coagulation, demonstrating broad application potential. Such findings underscore the significance of pH in the CaSO 3 /Fe(VI) system, elucidate the integrated impacts of pH-driven mechanisms, and provide data support for engineering applications.
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Journal of Energy Storage
·
2026
·
IF 10.7
Hao Lu,Jiale Niu,Jingjing Xie,Xiu He,Weiming Wang,Zhengyi Fu,Zhaoyong Zou
The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are key cathode reactions in clean energy storage devices such as zinc–air batteries. However, their sluggish kinetics severely limit device efficiency and large-scale application. Currently, M–N–C catalysts are considered the most promising candidates, yet they still suffer from issues such as mass transport limitations and insufficient stability. Inspired by the dynamic regulation of organic–inorganic interfaces during the formation of biological materials, we developed a novel method using 1,3,5-trimethylbenzene (TMB) as a mediating molecule to dynamically regulate the organic-inorganic interface between templates and ZIF-8 precursors, achieving the micro-meso-macropores of ZIF-8, which synergistically enhanced mass transport and active site accessibility. Meanwhile, phosphorus doping modulated the electronic structure of the Fe centers, forming Fe-N-P active sites and thereby significantly enhancing both catalytic activity and stability. Electrochemical tests showed that HPZIF-8-FeNP 5 exhibited excellent ORR performance in alkaline medium, with a half-wave potential of 0.8595 V (vs. RHE), outperforming commercial Pt/C while demonstrating good methanol tolerance and cycling stability. Furthermore, the catalyst also showed promising OER activity, with an over-potential of 284 mV at 10 mA cm −2 . When applied in a zinc–air battery, the device delivered a high open-circuit voltage (1.52 V), a high power density (227.4 mW cm −2 ), and long-term cycling stability (>400 h), surpassing the Pt/C-RuO 2 benchmark. This work provides a new material design strategy to advance rechargeable zinc-air battery technology, enabling efficient and durable energy storage.
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