OPTICAL MATERIALS
·
2021
·
IF 3.08
Qianwen Li,Limei Li,Xuanyu Long,Yu Tu,Lanqing Ling,Jiabao Gu,Liwei Hou,Yi Xu,Nan Liu,Zequan Li
Photocatalysis provides an exciting way to directly utilize solar energy to degrade environmental pollution. This process, however, suffers from rapid recombination of the photogenerated charges leading to low efficiency and instability. Herein, we report a novel MIL-88A(Fe)/Bi 2 WO 6 heterojunction as a highly efficient photocatalyst for degradation of organic compounds under visible-light irradiation. When tested in 10 mg/L Rhodamine B (RhB), such catalyst can get remarkable degradation efficiency, up to 96%, at 50 min visible-light irradiation time. Significantly, it also shows super performance for Tetracycline (TC). Moreover, MIL-88A(Fe)/Bi 2 WO 6 exhibited excellent photostability and recyclability. The superior photocatalytic activity of MIL-88A(Fe)/Bi 2 WO 6 may be the formation of a heterojunction between MIL-88A(Fe) and Bi 2 WO 6 with high surface area, which provides abundant active sites to drastically promote interactions between photocatalyst and reactants. Furthermore, the related electrochemical analysis and free radicals trapping experiments indicated that both •O 2 − and h + have significant effect in the degradation process. Our findings of the work not only provide a novel insight to the design and develop MOF-based heterojunction photocatalysts but also suggest its great potential application value for environmental remediation.
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CHEMOSPHERE
·
2021
·
IF 7.086
Fangru He,Hejun Ren,Tingting Li,Shuai Liu,Rui Zhou
This work demonstrated a novel N , N -bis(carboxymethyl)glutamic acid (GLDA) modified visible (vis) light assisted Fenton–like system which could effectively removal ciprofloxacin (CIP) at neutral pH. The removal rate of CIP in the GLDA/Fe(III)/H 2 O 2 /vis system was 97.9% within 120 min and was approximately twice as high as that in the Fe(III)/H 2 O 2 /vis system. GLDA could significantly accelerate the Fe(III)/Fe(II) cycle under visible light irradiation. Radical scavenging experiments demonstrated that 74.2% of the Fe(II) in the GLDA/Fe(III)/H 2 O 2 /vis system originated from the ligand–to–metal charge transfer reaction between Fe(III) and GLDA. The hydroxyl radical was the dominant species for CIP degradation. H 2 O 2 utilization kinetic modeling exhibited that 90.1% of H 2 O 2 was used for CIP mineralization. The effects of experimental parameters and coexisting substances on the removal of CIP in the Fe(III)/GLDA/H 2 O 2 /vis system were investigated in detail. The intermediate products of CIP were explored via the high–performance liquid chromatography-mass spectrometry.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Jiankun Li,Shang Wu,Quanlu Yang,Huize Zhang,Chenxu Zhu,Xiaoyi Meng,Xiaojun Yang,Qiong Su,Shuhe Kang,Juzhen Kang,Wei Lan
HS-FeNi-BNC is synthesized via B-bridging, with hollow porous carbon and Fe-B-Ni diatomic sites. • Fe-B-Ni bridge enables p-d hybridization to tune metal sites' electronic structures. • HS-FeNi-BNC delivers exceptional ORR/OER/HER electrocatalysis in alkaline media. • HS-FeNi-BNC-based ZABs operate from −10 to 60 °C with 92.9% Zn utilization efficiency. Rechargeable zinc-air batteries (ZABs) require efficient electrocatalysts to boost the sluggish oxygen reduction reaction (ORR)/ oxygen evolution reaction (OER) kinetics at the air cathode. However, designing high-activity catalysts faces considerable challenges due to spatial and electronic constraints. Herein, a boron-doped hollow spherical porous carbon (HS-FeNi-BNC) anchored with Fe-B-Ni diatomic sites is prepared via a facile B-bridging strategy, realizing the regulated construction of heteroatom doping and diatomic active sites. HS-FeNi-BNC possesses abundant micropores/mesopores, uniformly dispersed Fe Ni diatomic centers (0.27 nm spacing) with a Fe-B-Ni bridge structure, and topological carbon defects induced by B/N co-doping. HS-FeNi-BNC exhibits exceptional trifunctional electrocatalytic performance in alkaline electrolytes, with an ORR E 1/2 of 0.864 V, an OER overpotential of 308 mV and a hydrogen evolution reaction (HER) overpotential of 301 mV at 10 mA cm −2 . HS-FeNi-BNC-based ZABs achieve an outstanding wide-temperature operating range of −10 °C to 60 °C, a specific capacity of 761.51 mAh g −1 and a Zn utilization efficiency of 92.9%, outperforming Pt/C + RuO 2 -based ZABs. Density functional theory (DFT) calculations reveal that the Fe-B-Ni bridge structure triggers p-d orbital hybridization, regulating metal site electronic structures, optimizing reaction intermediate adsorption and accelerating interfacial electron transfer. This work advances the development of high-efficiency heteroatom-modified non-noble metal multifunctional catalysts. Download: Download high-res image (207KB) Download: Download full-size image
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Materials Research Express
·
2019
·Vol. 6
·期 10
·106108
·
IF 1.449
Wenli Pei,Xiaohan Zhang,Qinyu Meng,Jifeng Zhou,Yaozu Guo,Junhua You,Dong Zhao,Xiaoyang Wang
Nd-Fe-B nanoparticles have been successfully prepared by using an optimized low-energy chemical method. The effects of reduction-diffusion time on the microstructure and properties of Nd-Fe-B nanoparticles were investigated by using TEM, XRD, SEM, VSM and Rietveld calculations. The results showed that when the reduction-diffusion time was short, the reaction was not sufficient, which resulted in a residual H5Nd2 phase. When the reduction-diffusion time was prolonged, the H5Nd2 phase gradually decreased and the relative crystallinity of Nd2Fe14B phase gradually increased. Moreover, the grain size grew and the rich Nd phase appeared gradually around the grains. Furthermore, as the reduction-diffusion time was prolonged, the coercive force of Nd-Fe-B nanoparticles increased first and then decreased. When the holding time was extended to 180 min, the coercive force reached a maximum of about 4.85 kOe and the magnetic energy product was about 2.5 MGOe.
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ACS ES&T Engineering
·
2026
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IF 6.3
Zhenyu Gu,Jianhai Lu,Huimin Xu,Yemin Zhao,Shan Gao,Qiguang Dai,Xiaole Weng,Zhongbiao Wu
A novel Fe-doped ZSM-5 nanosphere catalyst was synthesized via a complex-assisted dynamic two-stage hydrothermal method using Na2EDTA as a chelating agent, followed by calcination under an inert atmosphere. The resulting material (Fe-ZSM-5EDTA-Ar) featured a hierarchical spherical architecture assembled from nanorods, possessing a high surface area (up to 511 m2/g), hierarchical porosity, and uniform dispersion of Fe species within the zeolite framework. Structural and spectroscopic analyses confirmed the successful isomorphous substitution of Fe2+/Fe3+ with a high proportion into the framework of ZSM-5, which concurrently enhanced structural stability and effectively suppressed iron leaching. Fe-ZSM-5EDTA-Ar demonstrated exceptional efficacy in the heterogeneous Fenton degradation of chlorobenzene (CB) employing H2O2 as the oxidant. This catalyst uniquely integrated high adsorption affinity with outstanding catalytic activity, resulting in complete dechlorination elimination of the target pollutant under optimized reaction conditions. Quenching experiments and electron paramagnetic resonance (EPR) collectively demonstrated that hydroxyl radicals were the dominant reactive oxygen species, driving the degradation process. Furthermore, Fe-ZSM-5EDTA-Ar also exhibited excellent recyclability in multiple cycles with negligible activity and iron loss. This work provides a robust synthesis strategy for designing stable and efficient zeolite-based Fenton catalysts for the remediation of chlorinated organic wastewater.
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 28
·12928-12941
·
IF 7.6
Mehrizi Mohammad,Zhou Li,Lv Yuze,Zhang Yi,Gao Xiu,Zhang Zhenzhou,Liu Wenqi,Tu Weifeng,Han Yi-Fan
The reverse water-gas shift (RWGS) reaction is widely regarded as a platform reaction for the conversion of CO 2 into value-added products. In this study, Fe-based catalysts modified with Cu and K were systematically investigated to elucidate the roles of metal promoters in regulating RWGS performance. The results demonstrate that a K-promoted Fe–Cu(2/3)/Al 2 O 3 catalyst exhibits enhanced CO 2 conversion together with nearly 100% selectivity toward CO. A combination of ex situ and in situ characterization techniques reveals that the introduction of Cu can enhance CO 2 conversion by modifying the surface structure and redox properties of Fe species. Subsequent K promotion also alters the surface reaction pathway by favoring the carboxylate-related route while suppressing the accumulation of formate species, which further suppresses methane formation and improves CO selectivity. These findings highlight the critical role of Cu–K synergy in tuning catalyst structure and reaction pathways for efficient RWGS reactions.
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Lin Yue,Shiqi Xing,Mengfei Wang,Hongxue An,Yunlong Yao,Yuxuan Li,Jing Lian
In this paper, the bimetallic zeolite imidazolate framework Ce-Fe-MI as a high-performance catalyst for ozonation-based degradation of tetracycline (TC) was investigated. During the catalytic process, electron transfer occurred between the two metal ions on the catalyst, and the mixed-valence state induced charge imbalance and unsaturated bonds, thereby forming catalytically active sites. Through comprehensive characterization and experimental evaluation, the Ce-Fe-MI catalytic ozonation process significantly enhanced the removal efficiency of COD and TOC, achieving a mineralization rate of 50% higher than ozonation alone. EPR identified the presence of uperoxide radicals (•O 2 - ) and singlet oxygen ( 1 O 2 ) as the main active species; however, quantitative analysis revealed hydroxyl radicals (•OH) was the main contributor to the degradation of pollutants, indicating the involvement of all three reactive oxygen species (ROS) in the catalytic ozonation reaction process. Density functional theory (DFT) calculations further demonstrated that the synergistic Ce-Fe interactions promoted electron transfer and facilitated ozone activation, leading to enhanced generation of reactive oxygen species. These findings emphasize the potential of Ce-Fe-MI catalyzed O 3 as an efficient and advanced oxidation process for antibiotic 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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FOOD CHEMISTRY
·
2026
·
IF 10.4
Weiqiao Yang,Wenjuan Wang,Ruxia Zhao,Xiaoyu Jia,Wen Cao,Hui Liu,Xiaoliang Duan
This study proposes a novel approach for fabricating a high-efficiency, oxygen-scavenging 1,2-polybutadiene (PB)/Fe(II)salen fibrous film (PBUF) via electrospinning, aimed at improving the oxidative stability of edible oils. By optimizing the process using response surface methodology with a Box-Behnken design (RSM-BBD), the PBUF with a minimum fiber diameter of 1.18 μm and a defect-free microscale structure was successfully prepared in a single step. Owing to its high surface area and porous structure, PBUF showed an increase in maximum oxygen-scavenging uptake of 56.07% and 1003.88% compared to the 1,2-polybutadiene (PB)/Fe(II)salen cast film (PBCF) and a commercial iron-based scavenger, respectively ( p < 0.05).When placed in the headspace of sealed walnut oil during accelerated oxidation (63 °C for 15 days), the PBUF (5 mg/g) can significantly inhibit the oil oxidation, resulting in reductions of 27.10% in peroxide value (PV), 36.19% in conjugated dienes (CD), and 52.10% in p-anisidine value (p-AV).
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Surfaces and Interfaces
·
2026
·
IF 6
Wenyuan Long,Haonan Niu,Ziqi Wang,Jiaqi Qiu,Jingyu Ran,Zhongqing Yang
CO 2 -assisted oxidative dehydrogenation of ethane to ethylene is a potential low-carbon process for CO 2 utilization and ethane upgrading. The key bottleneck of this reaction is the extent to which catalytic active sites can efficiently activate C=O bonds in CO 2 and precisely control the selective cleavage of C–C/C–H bonds in ethane. Herein, combined with catalytic activity evaluation, catalyst characterization, and density functional theory (DFT) calculations, this study systematically investigates the effect of rare earth metal (Ce, La, and Y) modification on the performance of Fe/ZrO 2 catalysts in ethane dehydrogenation with CO 2 . The results demonstrate that the Y-modified 3Fe/3Y-ZrO 2 catalyst achieves an ultrahigh C 2 H 4 selectivity of 89.8%. The underlying mechanism is as follows: Y doping markedly strengthens the metal-support interaction and lowers the formation energy of oxygen vacancies, thereby generating more oxygen vacancies. This enhancement promotes the mobility of active oxygen species, facilitating the release of more lattice oxygen, which acts as active sites to efficiently promote the cleavage of C–H bonds in ethane, thereby improving ethylene selectivity. Meanwhile, the O* species derived from reductive oxygen vacancies (O v ) are replenished through the cleavage of C=O bonds in CO 2 , further strengthening CO 2 activation. Additionally, Y doping enhances the specific surface area and pore volume of the 3Fe/3Y-ZrO 2 catalyst, increasing the exposure of active sites and further enhancing catalytic performance. This study provides novel research insights for the directed high-value conversion of CO 2 .
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