ChemistrySelect
·
2025
·Vol. 10
·期 23
·e00337
·
IF 2
Jingjing Yang,Xiayan Zhang,Zhi Song,Jialu Liu,Yeqiong Huang,Dongxu Han,Chuhan Xing,Jing Zhang,Boxia Liu
Graphical The Ni 3 Fe 1 -BC composite, featuring a coral-like mesoporous architecture and exposed Ni 2+ /Fe 3+ active sites, facilitates the rapid, monolayer adsorption of methyl blue through strong Ni─O coordination. The process follows Langmuir isotherm and pseudo-second-order kinetics, indicating high affinity and thermodynamic spontaneity. In this paper, the coral-like structure of Ni/Fe bimetallic atom cluster composite adsorbent (Ni 3 Fe 1 -BC) was utilized for the efficient removal of methyl blue (MB), and a removal rate of 98% could be achieved within 25 min. The large specific surface area and mesoporous structure of the material provide effective channels for the diffusion and adsorption of MB molecules. Ni 2+ and Fe 3+ species act as key adsorption sites during the adsorption process, especially when the oxygen atoms in MB first interact with Ni atoms to form a stable chemical bond, which enhances the stability of adsorption. Meanwhile, the adsorption process conformed to the pseudo-secondary kinetic model, and the isotherm analysis showed that the Langmuir model fitted better, reflecting the monolayer adsorption characteristics. The adsorption energy E ads = −2.04 eV further proved that the adsorption process was spontaneous and exothermic with good thermodynamic stability. In addition, Ni 3 Fe 1 -BC exhibits excellent adaptability and cyclic stability in different water environments, making it an efficient and stable adsorbent for water treatment.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Feng Zihao,Wang Yang,Ren Qi,Yi Cui,Li Yang,Du Yanjun,Wang Changfu,Wang Yun
Effective U(VI) separation from uranium wastewater is crucial for nuclear energy's sustainable growth. A magnetic, cauliflower-shaped magnesium-iron bimetallic oxide loaded biochar (MFBC) was fabricated via a green hydrothermal co-pyrolysis. Its U(VI) adsorption process was pH-dependent and fitting Langmuir–Freundlich and pseudo-second-order models, the theoretical maximum adsorption capacity of U(VI) by MFBC peaked at 1354.8 mg·g −1 (pH 5.0, 30 min). After five regenerations, 90.3% removal remained. The adsorption mechanism of MFBC for U(VI) involved electrostatic interaction, surface complexation, ion exchange and reduction reaction, making it a highly efficient and excellent adsorbent for treating uranium-containing wastewater.
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BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Wenye Li,Binghan Xie,Zhipeng Li,Guoyu Zhang,Zhiying Lv,Qinghao Li,Shuyu Zhao,Mu Tong,Yuanyuan Gao,Langming Bai
The effective dewatering of waste activated sludge (WAS) and the utilization of resources are crucial for the sustainable development of wastewater treatment plants. Ultrasonic (US) collaborative iron-carbon (Fe-C) activated peroxydisulfate (PDS) coupling system was constructed to investigate the transformation of physicochemical properties and explore the mechanisms during the cracking and oxidation of WAS. The ultrasonic enhanced Fe-C/PDS system, which exhibited excellent oxidation capacity under the conditions of PDS, Fe-C, and ultrasonic power levels at 0.12 g/g TS, 0.3 g/g TS, and 0.3 W/mL. The water content of the sludge cake was reduced to 61.71 %, while the specific resistance to filtration was lowered to 1.12 × 10 12 m/kg (decreased by 88.2 %). Furthermore, ultrasonic improved the WAS cracking capacity with a satisfying SCOD production (630.64 mg/L) and a dramatic reduction of 9.16 % in volatile solids. Compared to Fe-C/PDS, the addition of ultrasonic enhanced the leaching of Fe, released carbon source and promoted the formation of various reactive oxidative species to degrade bound EPS. The contribution of O 2 − and 1 O 2 was 37.00 % and 43.17 %, indicating the oxidation process of free radicals and non-free radicals in Fe-C/PDS/US system. Additionally, the concentration of short-chain fatty acids was increased by 96.7 %, which significantly accelerating the quality of carbon source suitable for recycling. The positive improvement of sludge physicochemical properties revealed the disintegration-degradation synergistic effect of the Fe-C/PDS/US systems. These findings provide a novel strategy for effective disposal and reduction in WAS while also offering valuable insights into resource utilization.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Haiyan Chen,Haibo Xu,Yeyin Li,Zhibin Li,Xin Wang,Bo Jiang,Rongshun Lai,Wenbin Fan,Chuntao Xiang,Zhi Yang,Xiao Chi,Qiang Ma
Selective chlorination has been proven to be an energy-efficient and environmentally friendly method for recycling rare earth elements (REEs) from Nd-Fe-B waste. However, little attention has been paid to the in-depth study of Nd-Fe-B sludge chlorination until now. In this work, four isoconversion methods combined with an unreacted shrinkage core model were employed for the first time to investigate the kinetic behavior of the chlorination reaction between FeCl 3 and Nd-Fe-B sludge. Through thermodynamic calculations, TG-DSC, SEM-EDS, and XRD analysis, the chlorination process and phase transformation behavior of Nd-Fe-B sludge were elucidated. The results show that under optimal conditions (350 °C, FeCl 3 /RE=3:1, 2 h), the RE components in Nd-Fe-B sludge are selectively chlorinated to RECl 3 , avoiding the formation of REOCl, while the iron components primarily exist in the leaching residue as Fe 2 O 3 or FeOCl. And 97.32 % of REEs are selectively extracted into the leachate, while the iron leaching rate is only 4.02 %. Besides, the STA method is the most accurate, yielding E α-STA and A values of 75.01 kJ/mol and 2.6 × 10 6 min −1 , respectively. The reaction control mechanism was analyzed in three steps. In Step 1 (0.05 < α < 0.63) and Step 2 (0.63 < α < 0.75), the diffusion reaction mechanism controls the overall reaction, In Step 3 (0.75 < α < 0.95), the nucleation reaction takes over the control, which provides a good explanation for the change in E α-STA . However, the control step of the entire chlorination reaction is dominated by the internal diffusion process.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Rui Chen,Qianru Zhao,Bohan Jia,Zhenyong Wang,Yucang Du,Jinsuo Lu
While Fe-based amorphous alloys exhibit remarkable pollutant degradation capabilities, their synergistic application with peroxymonosulfate (PMS) in ultrafiltration (UF) systems remains underexplored. This study investigated the novel Fe 92 B 6 Si 2 /PMS pretreatment system that significantly enhanced UF performance, with normalized flux (J/J₀) increasing from 0.28 to 0.93 LMH. The formation of a loose and porous cake layer led to significant reductions in reversible and irreversible resistances by 80.26% and 65.89%, respectively. It achieved significant NOM removal, with DOC and UV₂₅₄ reductions of 78.32% and 50.37%, respectively. Parallel factor analysis combined with self-organizing maps confirmed the effective removal of both humic-like and protein-like substances. Size exclusion chromatography and Fourier transform ion cyclotron resonance mass spectrometry further revealed the breakdown of high molecular weight organics into smaller fragments, with an 11.79% increase in low MW compounds (< 0.85 kDa). The oxidation process preferentially removed low-oxygen molecules (O/C < 0.6), generating high-oxygen compounds enriched with nitrogen and sulfur, such as tannins and condensed hydrocarbons. The high reactivity and self-renewing surface of Fe₉₂B₆Si₂, coupled with the Fe 2+ /Fe 3+ redox cycle, ensured continuous generation of SO₄• − and •OH radicals, effectively promoting pollutant degradation and membrane fouling mitigation. Moreover, the system maintained high degradation efficiency, stability, and safety over five cycles. These findings demonstrate the potential of Fe₉₂B₆Si₂/PMS as a promising UF pretreatment strategy to enhance water treatment efficiency.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2025
·
IF 3
Zhihui Xu,Jing Li,Xiaoling Peng,Shan Tao,Jingcai Xu,Bo Hong,Xinqing Wang
The present study utilized Y 3 Fe 5 O 12 (YIG) ferrites as a coating on Fe-Si-B-Cu-Zr nanocrystalline magnetic powder to fabricate soft magnetic composites (SMCs). The influence of YIG content and annealing temperature on the magnetic properties of Fe-Si-B-Cu-Zr/YIG SMCs was investigated. It was revealed that an appropriate amount of YIG in the composite could enhance the permeability and its resistance to DC bias, while reducing eddy current loss. The results demonstrated that the Fe-Si-B-Cu-Zr/YIG SMCs coated with 1.0 wt% YIG exhibited good comprehensive magnetic properties, with a permeability of 33.8, 86.1 % retention under a DC bias of 100 Oe, and a 53.1 % reduction in eddy current loss to 13.86 mW/cm 3 at 500 kHz and 10 mT. Besides, the optimal annealing temperature for achieving decrease core loss and maximum permeability was determined to be 500℃ for the Fe-Si-B-Cu-Zr/YIG SMCs. This study demonstrates a promising coating material to enhance the high-frequency magnetic properties of nanocrystalline soft magnetic composite.
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Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·237
·
IF 38.5
Wang Xiaoxue,Xu Yuhui,Zhang Jianhua,Xi Yukun,Hou Ningjing,Chen Yixuan,Liu Dongzhu,Yang Zihao,Wen Haocheng,Kang Jia,Yang Xiaoli,Song Xuexia,Wang Jingjing,Li Wenbin,Zhang Jiujun,Zhang Kun,Li Xifei
Na4Fe3(PO4)2P2O7 (NFPP) is regarded as a prospective cathode for sodium-ion batteries (SIBs) because of its high structural stability and cost-effectiveness. However, its practical application is hindered by intrinsically low electronic conductivity. Herein, an unconventional electron transfer mechanism from Ni2+ to Fe3+ ions is unveiled in Ni-doped Na4.3Fe3(PO4)2P2O7 (NFPP-Ni) cathode, which facilitates electronic coupling within the Fe−O−Ni coordination unit and thereby effectively boosts electron transport. Moreover, the redox kinetics and reversibility of NFPP materials are predominantly governed by the degree of Fe−O covalency. The intermediate eg occupancy of Fe2+, modulated by the presence of Ni2+, optimizes the overlap between Fe d and O p orbitals. The adjustment of Ni dopant strikes a balance between accelerating Na+ diffusion kinetics and mitigating lattice strain during cycling. As a result, the NFPP-Ni electrode displays impressive rate capacity (121.0 mAh g−1 at 0.1C / 80.9 mAh g−1 at 10C) and stable cyclability (89.1% capacity retention after 1000 cycles). More importantly, the relationship between Fe eg orbital occupancy and Fe−O covalency in NFPP as modulated by various transition metal cations (Ni2+, Mn2+, Zn2+, Co2+ and Cu2+) with different electron configurations are systematically elucidated, thereby providing insights for the commercial development of sodium-ion batteries (SIBs).
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121568
·
IF 7.2
Yajie Zhang,Yang Yang,Mengke Li,Xinzhuo Liu,Yulan Li,Xiaobin Niu
Electrochemical self-reconstruction is a critical process in transition metal-based electrocatalysts, as it governs the generation of catalytically active species during the oxygen evolution reaction (OER). In the NiMoO 4 system, γ-NiOOH is recognized as the truly active species, however, its slow and shallow reconstruction severely limits catalytic performance. Herein, a Fe doping strategy is employed to accelerate the in situ self-reconstruction kinetics of NiMoO 4 . A series of Fe-doped NiMoO 4 catalysts were synthesized via a one-step hydrothermal method, and the influence of Fe doping on the structural evolution and catalytic mechanism of the materials was systematically investigated. Fe incorporation induces preferential exposure of low-index crystal planes and lattice distortion, which facilitates selective Mo leaching and modulates the electronic structure of Ni. This synergistic effect not only enhances the extent but also accelerates the rate of self-reconstruction, thereby promoting the formation of low-crystallinity γ-NiOOH and consequently activating the lattice oxygen mechanism (LOM). As a result, 30 %Fe-NiMoO 4 -R exhibits a low overpotential of 205 mV@10 mA cm −2 , with stability for 400 h at 50 and 100 mA cm −2 . This work clarifies the role of Fe doping in tuning reconstruction dynamics and provides valuable insights into the design of efficient OER catalysts via lattice oxygen activation.
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NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Chenxi Zhang,Fangke Zhou,Yuyijian Zhao,Siyu Wang,Shihan Huang,Qin Zhao,Di Lan,Xiaoming Guo,Yijin Ren,Bo Liang
The development of high-performance electromagnetic wave absorbing materials has become crucial for addressing electromagnetic pollution. This study reports a facile in situ ion exchange strategy followed by pyrolysis for the successful preparation of N-doped porous carbon foam embedded with uniformly dispersed magnetic Fe3C/Fe nanoparticles (Fe3C/Fe@NPCF). The strong coordination between carboxyl groups on the polyamic acid (PAA) chains and Fe3+ ions effectively prevents the agglomeration of magnetic particles during high-temperature treatment and achieves their high dispersion within the carbon matrix. The effects of carbonization temperature on the microstructure, electromagnetic parameters, and microwave absorption properties were systematically investigated. The results demonstrate that the Fe3C/Fe@NPCF-800 composite exhibits exceptional microwave absorption performance with a minimum reflection loss (RLmin) of −30.19 dB at a minimal thickness of only 2.0 mm and an ultra-wide effective absorption bandwidth (EAB) of 6.48 GHz. This outstanding performance originates from the introduction of magnetic components that optimize impedance matching, allowing electromagnetic waves to be effectively attenuated. This work not only provides a high-performance absorbing material but also offers a novel design strategy and fabrication method for developing lightweight absorbers with both strong absorption capability and broad bandwidth.
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Small
·
2026
·
IF 12.1
Bin Li,Hao Xiong,Guangying Chen,Xiaomin Guan,Jing Chen,Jian Pu,Bo Chi,Yunfeng Tian,Kaisheng Xia
The development of oxygen electrodes for reversible solid oxide cells (RSOCs) is hindered by insufficient catalytic activity, limited stability, and a mismatch in the thermal expansion coefficients (TEC) with electrolytes. Herein, we design and synthesize a novel perovskite oxide, La 0.6 Ca 0.4 Fe 0.8 Ni 0.1 Co 0.1 O 3–δ (LCFNC), using a multi-element B-site synergistic doping strategy. Systematic investigations reveal that the incorporation of Fe stabilizes the perovskite lattice, while the addition of Ni and Ca effectively suppresses the TEC (to 12.7 × 10 −6 K −1 after GDC compositing), ensuring excellent electrolyte compatibility. Furthermore, the cooperative interplay between Ni, Co, and Fe establishes ternary active centers, significantly increasing the concentration of surface oxygen vacancies. Full-cell measurements demonstrate a peak power density of 1.60 W·cm −2 at 800°C and a high electrolysis current density of 1.82 A·cm −2 at 1.3 V. Stability tests, including 100 h of constant-current electrolysis at 750°C and 24 reversible operation cycles, highlight exceptional interfacial and structural stability. More importantly, the assembled industrial-sized RSOCs (15 × 15 cm 2 ) achieve an output power of 64 W in fuel cell mode and a maximum current of 105 A in electrolyzer mode at 800°C, demonstrating its potential for practical applications. This work elucidates the mechanistic role of multi-element B-site regulation and provides an effective design principle for oxygen electrode materials that enhance activity, stability, and compatibility simultaneously, thus advancing the practical deployment of high-performance RSOCs.
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Sustainable Materials and Technologies
·
2026
·
IF 9.2
Rumeng Ye,Kai Tian,Yingzhe Xu,Jianbiao Peng,Xingbing He,Minjie Deng,Xueying Chu
Current studies involve excessively complex synthesis of metal-modified biochar for the adsorption of tetracycline hydrochloride (TC), focusing on the effects of a single strategy and neglecting systematic comparisons. For environmental sustainability, Fe₃O₄/MnOₓ-modified rice husk biochar (BC) was simply synthesized by impregnation-precipitation. Batch adsorption experiments were conducted on BC, Fe-modified (BC-Fe), and KMnO 4 -modified (BC-Mn) biochars to assess their TC removal efficiency. The mechanisms were investigated by FTIR, XRD, XPS, and UV–vis. Results demonstrated BC-Fe and BC-Mn exhibited significantly enhanced TC adsorption capacities compared with BC (170.06/266.94/132.86 mg/g, respectively). This improvement is attributed to increased specific surface area, refined microporous architecture, enriched O-containing functional groups, and the incorporation of Fe 3 O 4 /MnO x nanoparticles. Divergent adsorption behaviors were observed: BC-Fe operates through an endothermic process dominated by diffusion, pore filling, electrostatic adsorption, coordination interactions, and hydrogen bonding; this process is pH-sensitive and further promoted by the presence of SO 4 2− , PO 4 3− and CO 3 2− ions. In contrast, BC-Mn exhibits a stable adsorption mechanism minimally affected by pH or ionic composition, combining diffusion, pore filling, and hydrogen bonding with catalytic oxidation (Mn (III), Mn (IV)) that disrupts and degrades the conjugated structure of TC. Fe/Mn-modified adsorption guides TC targeted remediation and rice husk sustainable utilization. By converting agricultural byproducts into high-performance environmental remediation materials, this study advances the ecological circular economy, realizing the dual value of waste recycling and pollution control.
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MOLECULES
·
2024
·Vol. 29
·期 4
·850
·
IF 4.2
Meng Guo,Dou Wu,Hongyu Yang,Xiao Zhang,Dong-Xu Xue,Weiqiang Zhang
The use of gaseous CO in Pd-catalyzed carbonylative quinolone synthesis presents challenges related to safety and precise pressure control. In response, a streamlined non-gaseous synthesis of 4-quinolone compounds has been developed. This study introduces a tunable CO-releasing system utilizing Fe(CO)5activated by a dual-base system of piperazine and triethylamine. This alternative liquid CO resource facilitates the palladium-catalyzed carbonylative C-C coupling and subsequent intramolecular cyclization. By tuning the tandem kinetics of carbonylation and cyclization, this non-gaseous method achieves the successful synthesis of 22 distinct 4-quinolones with excellent yields. This is achieved through the three-component condensation of sub-stoichiometric amounts of Fe(CO)5with 2-iodoaniline and terminal alkynes. Operando mechanistic studies have revealed a novel CO transfer mechanism that facilitates homogeneous carbonylative cyclization, distinguishing this method from traditional techniques. In addition to addressing safety concerns, this approach also provides precise control over selectivity, with significant implications for pharmaceutical research and the efficient synthesis of pharmaceutical and bioactive compounds.
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