RARE METALS
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2025
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IF 11
Wu Jing,Rong Jian,Chen Wang-Yi,Wang Chao-Sheng,Feng Chu-Jun,Ao Huai-Sheng,Zhu Cheng-Zhang,Zhang Yu-Zhe,Li Zhong-Yu
Regulating the electronic structure and oxygen-containing intermediates adsorption behavior on Fe-based catalysts is of great significance to cope with the sluggish oxygen reduction reaction (ORR) kinetics, but it still remains a great challenge. In this work, Fe atom clusters (Fe AC ) modified by high-density Cu single atoms (Cu SA ) in a N,S-doped porous carbon substrate (Fe AC /Cu SA @NCS) is reported for enhanced ORR electrocatalysis. Fe AC /Cu SA @NCS exhibits excellent ORR performance with a half-wave potential ( E 1/2 ) of 0.911 V, a high four-electron process selectivity and excellent stability. The ORR performance is also verified in the Fe AC /Cu SA @NCS-based Zn-air battery, which shows a high peak power density of 192.67 mW cm −2 , a higher specific capacity of 808.3 mAh g −1 and impressive charge–discharge cycle stability. Moreover, density functional theory calculations show that Cu single atoms synergistically modulate the electronic structure Fe active atoms in Fe atomic clusters, reducing the energy barrier of the rate-determining step (i.e., * OH desorption) on Fe AC /Cu SA @NCS. This work provides an effective way to regulate the electronic structure of Fe-based catalysts and optimize their electrocatalytic activity based on the introduction of a second metal source. Graphical abstract
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BIOCHEMICAL ENGINEERING JOURNAL
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2025
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IF 3.8
Li Zhang,Yu Yan,Diannan Huang,Liansong Gao,Rongxin Zhang
Anaerobic fermentation technology presents significant advantages in waste activated sludge treatment, encompassing sludge reduction, detoxification, and resource recovery, primarily by generating high-value volatile fatty acids (VFAs). This study systematically investigated the enhancement effects of Fe²⁺/sodium percarbonate (SPC) pretreatment on sludge disintegration and organic matter hydrolysis. The optimal pretreatment conditions (initial pH=3, SPC dosage=0.3 g/g TSS, Fe²⁺ dosage=0.3 g/g TSS) resulted in a maximum VFAs production of 1598 mg COD/L, representing a 7.26-fold increase compared to untreated sludge. Under these conditions, acetic acid accounted for 52.9 % of the total VFAs. The mechanistic analysis demonstrated that Fe²⁺/SPC pretreatment selectively enriched hydrolytic-acidogenic microbial communities while inhibiting VFAs-consuming populations, thereby directing metabolic flux toward acid accumulation. These findings establish an innovative technical approach and provide a mechanistic framework for advanced resource recovery from waste activated sludge.
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IONICS
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2025
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IF 2.6
Li Dongliang,Wang Xiangnan
La-excess-type lanthanum silicate doped with Fe (La 10 Si 6- x Fe x O 27 , x = 0, 0.2, 0.4, 0.6) was synthesized through planetary ball milling. The resulting materials were systematically characterized for their crystal structure, infrared spectral features, microstructural properties, and electrical conduction behavior. It is revealed that La 10 Si 6- x Fe x O 27 remains apatite type, and Fe is doped into Si site. The surface particles of the La 10 Si 6- x Fe x O 27 ceramic sample are without holes, and the particles are arranged tightly and evenly. The element distribution of La 10 Si 6- x Fe x O 27 ceramic samples is uniform, and the element content conforms to the stoichiometric ratio. Both total and electronic conductivities exhibit a gradual enhancement with increasing iron content. A sensor was fabricated using dense diffusion barrier of La 10 Si 5.4 Fe 0.6 O 27 and solid electrolyte of La 10 Si 6 O 27 . Limiting current meets certain relationship with temperature and oxygen volume fraction, such as lg I L (mA) = − 0.56 − 1.36 × 1000/ T (K −1 ) and I L (mA) = 3.10 + 0.69 × \(\varphi\) (O 2 ) (%). The sensor exhibits CO 2 /H 2 O-insensitive limiting current.
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ACS Earth and Space Chemistry
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2025
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IF 2.9
Qi Tao,Yonglei Zhang,Tianqi Zhang,Xiaorong Qin,Binglong Ye,Hongping He,Sridhar Komarneni
Over the past decade, remote sensing exploration has revealed widespread detection of clay minerals in Noachian terrains (>3.7 Ga) on Mars, suggesting a period of active near-surface water–rock interaction. The in-depth characterization of the crystal structure and chemistry of laboratory-synthesized smectite minerals with varying compositions offers a unique perspective to further constrain their formation mechanism, environmental conditions, and the climate of early Mars. This study synthesized smectites with varying Fe/Mg ratios to compare their near-infrared (NIR) spectral characteristics with those of representative areas on Mars. The study revealed that the characteristic metal–OH (M–OH) band in the range of 2270–2320 nm shifted toward longer wavelengths as the octahedral Fe3+ content decreased. When the octahedral Fe/Mg ratio was close to 1, the position of M–OH was similar to that of Mg-smectite (saponite), indicating that although the M–OH band of smectite is located at ca. 2308–2312 nm, it may still contain a significant amount of octahedral Fe3+. This suggests that there are likely still many Fe-smectites in Mg-rich smectite outcrops (ca. 20% as in the literature) on the Martian surface. Furthermore, correlation analysis between the smectite layer stacking order index (V/P) and the second-order derivative band intensity ratio (Deriv2 ratio) showed that when the Deriv2 ratio is small (generally <8), smectite has a relatively high degree of layer stacking order. When the Deriv2 ratio is >10 and tends toward infinity (+∞), the layer stacking order of smectite is very low. The above results suggest that the crystal chemical characteristics of smectites should be carefully studied when analyzing the mineral composition of the Mars surface using remote sensing or in situ NIR spectra. Smectites on Mars generally exhibit a high layer stacking order, indicating the presence of a relatively long-term warm and humid climate in Martian history. However, later alteration processes can significantly reduce their crystallinity.
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OPTICAL MATERIALS
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2025
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IF 4.2
Yuxi Liu,Wenjing Zhang,Weimeng Chi,Yuxuan Liu,Ying Chen,Yuning Liang
As a potential Fenton catalyst, Fe-based organic frameworks (Fe-MOFs) severely limit their application in practical heavy pollution due to their slow cycling rate. In this work, a novel photocatalyst (NH 2 -MIL101(Fe, Cu)/WO 3 ) was synthesized using a two-step hydrothermal method. Research on photocatalytic activity revealed that NH 2 -MIL101(Fe, Cu)/WO 3 , when combined with H 2 O 2 , exhibits higher degradation efficiency compared than pure NH 2 -MIL101(Fe, Cu) or WO 3 alone, achieving up to 90 % degradation of levofloxacin (LEV) under visible light irradiation. In addition, the effects of hydrogen peroxide dosage, pH and other factors on degradation performance were studied, and the results demonstrated good stability even after multiple cycles. This excellent photocatalytic performance is attributed to the formation of heterogeneous structures as well as the doping of copper ions. This not only inhibits the electron-hole recombination, but also improves the redox capacity of the catalyst accelerating the regeneration of Fe 3+ . This work offers a way to enhance the photo-Fenton activity of Fe-MOF-based catalysts.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2025
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IF 4.7
Jiaze Chen,Huijie Xie,Yusen Chen,Dong Guo,Binjie Li,Xuanxuan Sun,Volodymyr Turkevych,Caixia Li,Dehong Chen,Lei Wang,Bin Li
Fenton-like degradation based on iron catalyst have been developed to remove organic pollutants from wastewater. However, iron-based catalysts still face challenges of poor accessibility and stability of active sites. Here, we report a facile and green method for the preparation of Fe x Cu (1-x) @HZSM-5 catalyst using ethylenediamine as an organic ligand to stabilize metal species via a combination of solid-state grinding and steam-assisted crystallization methods without organic templates. Due to the confinement of zeolite ZSM-5 framework and synergistic effect of Fe and Cu bimetals, the optimized Fe 0.8 Cu 0.2 @HZSM-5 catalyst exhibits excellent activity and reusability in the Fenton-like degradation of methylene blue at the neutral condition. Our strategy for fabricating bimetal@zeolite can bring about new thoughts for the preparation of iron-based catalyst with high efficiency for Fenton-like degradation.
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Journal of Materials Chemistry A
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2025
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IF 9.5
Mutian Zhang,Ziying Ji,Shijie Pan,Xiang Liu,Wei Zheng,Jiajia Wang,Guobing Ying
In this study, Fe-doped Co3O4 nanoparticles were synthesized using a hydrothermal method followed by ultrasonic cell disruption to enhance the alkaline hydrogen evolution reaction (HER) performance. Through a dual-modification strategy combining elemental doping and morphology engineering, structural characterizations confirmed that Fe doping induces lattice distortions and optimizes the electronic structure, while ultrasonic cell disruption effectively reduces particle size to ~50 nm and increases active site density. The 10Fe-Co3O4 Ultrasonicated Nanoparticles (UNPs) catalyst showed remarkable HER performance, with overpotentials of 210.7 mV and 264.0 mV at 10 and 100 mA/cm2, respectively, and a Tafel slope of 75.2 mV/dec in 1 M KOH. DFT calculations indicate that Fe doping improves water adsorption, lowers energy barriers in the Volmer and Heyrovsky steps, and shifts the d-band center, thereby accelerating HER kinetics. The 10Fe-Co3O4 UNPs catalyst also demonstrated excellent durability, maintaining stable performance over 24 hours under high current densities. This work highlights the potential of Fe-doped Co3O4 as a cost-effective, high-efficiency, non-noble metal-based catalyst for HER, providing valuable insights into catalyst design and advancing sustainable hydrogen production technologies.
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POWDER TECHNOLOGY
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2025
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IF 4.6
Yanting Zhou,Junchao Zhao,Tengfei Wang,Zhilei Yu,Yangyang Fu,Yong Jiang,Xudong Cheng,Heping Zhang
Despite the exceptional fire-suppressant capabilities of ultrafine dry powder fire extinguishing agents, additional work is essential to improve their overall fire-extinguishing performance. In this investigation, we explored the utility of Fe 3+ loaded ZSM-5 zeolite in enhancing the firefighting capabilities of ultrafine dry powder fire extinguishing agents. The loading of transition metal ions Fe 3+ onto the ZSM-5 zeolite was achieved through the ion solution exchange method. Interestingly, the loading of Fe element on Fe/ZSM-5 zeolite displayed a pattern of initial increase followed by decrease as the ion exchange time lengthened. Furthermore, the loading of Fe element on Fe/ZSM-5 zeolite was found to be influenced positively by the initial molar concentration of Fe 3+ and pH levels. Impressively, under specific working conditions, the prepared Fe/ZSM-5 zeolite demonstrated a substantial Fe element loading of 5.82 %. Incorporation of ZSM-5 zeolite resulted in a 10.01 % enhancement in the fire-extinguishing efficiency of the ultrafine dry powder compared to undoped samples. Moreover, the incorporation of Fe/ZSM-5 zeolite has resulted in an enhancement of fire extinguishing efficiency by 20.45 % (S3), 24.20 % (S4), and 29.04 % (S5) in comparison to S1. These findings contribute to the understanding that the incorporation of Fe/ZSM-5 zeolite significantly enhances the fire extinguishing performance of ultrafine dry powder fire extinguishing agents, with extinguishing efficiency improving with increased Fe element loading.
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APPLIED CATALYSIS A-GENERAL
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2015
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IF 3.942
Pei Wu,Xuegang Luo,Sizhao Zhang,Ke Li,Fangwei Qi
A novel photo/thermocatalyst was synthesized using co-precipitation. The catalyst above was used to degrade the dye methylene blue (MB), via the processes of thermocatalytic degradation (TCD) and photo/thermocatalytic degradation (PTCD). The catalysts were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), UV–Vis diffusion reflectance spectroscopy (DRS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), the Brunauer–Emmett–Teller (BET) technique, and the terephthalic acid photo-luminescence probing technique (TA-PL). Fe-doped Sr 2 Bi 2 O 5 powder was found to exhibit a high thermocatalytic activity and a high photo/thermocatalytic activity for the degradation of MB. The TCD and PTCD MB removal efficiencies reached 92.6 and 98.8%, respectively. Furthermore, HO and O 2 − were not found to be the predominant active radicals. Holes were found to be generated in both two TCD and PTCD; however, TA-PL and radical scavenger experiments indicated that more holes were formed in PTCD. This study discussed the probable thermocatalytic and photo/thermocatalytic mechanisms, finding them to be in good agreement with results.
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TALANTA
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2022
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IF 6.556
Xiaofang Chen,Min Feng,Xiaoyi Xie,Yi Zhang,Jie Zhang,Xiupei Yang
Single-atom catalysts have attracted enormous research interest in the field of catalysis owing to their remarkable catalytic activity, excellent stability and outstanding atom utilization. Herein, a new single atom based on single Fe atoms on fluorine-doped (Fe–SAs@FNC) ultrathin carbon nanosheets was successfully synthesized by a polymer-assisted heating method. Experimental evidence showed that the resultant Fe–SAs@FNC with Fe–N 4 sites exhibits superior peroxidase-like activity, which oxidizes the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue product in the presence of hydrogen peroxide (H 2 O 2 ). Based on this, an ultrasensitive and highly selective colorimetric detection method for p -phenylenediamine (PPD) in hair dyes and PPD in hair after dyeing was established, which had a wide linear range (0.2–50 μM) and low detection limit (0.07 μM). This method shows satisfactory sensitivity and selectivity.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Xuan Zhang,Xi Du,Yan Ke,Yu-Gao Zhang,Zhi-Kang Xu
Loose nanofiltration membranes (LNMs) have attracted increased attention in the field of sustainable management of the highly-saline textile wastewater. Remained challenges include achieving efficient dye/salt fractionation and alleviating high fouling propensity. Herein, functionalized-LNMs (F-LNMs) are developed by the co-deposition of polyethylenimine and tannic acid, followed by the assembly of ferric ions (Fe(III)) and organophosphonic acid (OPa) for antifouling surface construction. Plentiful OPa groups are immobilized onto the membrane surface via the high surface binding affinity and the strong coordination bonding of Fe(III) as ‘bridge’ linkers. The superior hydrophilicity and large steric hindrance of these OPa groups endow the F-LNMs with notably improved antifouling property against organic dye clusters. The optimized F-LNMs show significantly increased membrane permeance (10–30 L m −2 h −1 ·bar −1 ) in treating those simulated dye/salt aqueous solutions containing 1.0 g L −1 dye and 80.0 g L −1 Na 2 SO 4 . They also exhibit high salt permeation (>94%) and acceptable dye rejection (overall >93%) of Congo red, methyl blue and three hydrolyzed reactive dyes. Furthermore, the direct reuse of Na 2 SO 4 from the actual dyeing effluent is achieved by combining membrane separation and activated carbon adsorption, revealing the promising application prospects of F-LNMs in managing highly-saline textile wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Rongyao Wang,Yanjun Yu,Ruijuan Zhang,Xiaohua Ren,Weilin Guo
Layered double hydroxide (LDH)-based catalysts have been corroborated to be effective for persulfate (PS) activation towards wastewater remediation. However, the effect of vacancies especially the role of cation vacancies in LDH has not been well illustrated. In this study, NiFe-LDH with Ni(II) vacancies (NiFe-LDH-V Ni ) or Fe(III) vacancies (NiFe-LDH-V Fe ) were fabricated via defect-engineering to tune catalytic activity on PS activation for tetracycline (TC) degradation. Characterizations of X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed cation vacancies were successfully implanted in NiFe-LDH catalyst. Experiments demonstrated that cation vacancies enhance the catalytic performance while NiFe-LDH-V Ni exhibited better activation performance since vacancies could facilitate the electron transfer, thereby forming more reactive oxygen species. Meanwhile, theoretical calculations disclosed that the NiFe-LDH with Ni(II) or Fe(III) vacancies possessed larger surface energy, lower Fermi energy and more positive Mulliken atomic charges than bare NiFe-LDH. About 80% of 30 mg·L −1 TC could be mineralized through the catalysis of NiFe-LDH-V Ni /PS system in 90 min. Furthermore, quenching experiments confirmed that the SO 4 − and OH generated by interface reaction accounted for the TC degradation. 1 O 2 and O 2 − species were also identified in the presence of oxygen vacancies through nitrogen gas cleaning experiments. Ultimately, a possible mechanism of TC degradation was proposed in NiFe-LDH/PS system with Ni(II) or Fe(III) vacancies. This study provides a possible guideline to discover the appropriate cation vacancies that contribute to the activation process and also provides a strategy to rationally design high-activity catalysts based on defect engineering.
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