CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Fei Lin,Honglei Ren,Fengtao Sun,Xiaoxue Pan,Xuesheng Zhang
Organic synthetic phenolic antioxidants (SPAs) and inorganic Fe-based antioxidants are widely used in daily life to prevent or delay oxidation and prolong storage and use. However, the ubiquitous occurrence of SPAs and the unreasonable disposal of Fe-based antioxidants (typically throwing them away) cause environmental issues and waste Fe resources. In this study, 16 solid SPAs and one important SPA intermediate were selected as target pollutants and destroyed via the ball milling Fe-based antioxidants collected from food bags packaged under a vacuum. Typical influencing factors, such as the co-grinder type, content, and grinding velocity, significantly affected the destruction efficiencies of the substrate (4- tert -octylphenol, 4- t OP, a representative commonly used SPA). Under optimal conditions, 0.1 g of 17 SPAs achieved high removal rates (35 %–97 %), with the highest first-order reaction rate constant ( k ) for propyl gallate (PG) being 1.00 h −1 , and the lowest k value for 2,6-di- tert -butyl-4-methylphenol (BHT) being 0.09 h −1 . Experimental and characterization (X-ray diffraction, Fourier transform-infrared spectroscopy, and X-ray photoelectron spectroscopy) observations showed that the reduction of Fe 0 , the oxidation of •OH, the reduction and oxidation of Fe(II) and Fe(III), oxygen vacancies, and mechanical forces exerted during ball-milling contributed to SPA destruction. Among these, the first two were the main mechanisms; however, the mechanical forces could not be ignored. Ten intermediates generated by 4- t OP during Fe-based ball milling were identified based on mass spectrometric results. Three pathways involved were hydroxylation, dealkylation, and polymer formation, and hydroxylation products were more abundant than others. According to ECOSAR and T.E.S.T program analyses, the ecotoxicity of most of the obtained intermediates was reduced. These findings reveal that Fe-based ball-milling technology can treat solid SPA pollution and achieve double-win performance.
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Applied Sciences-Basel
·
2025
·Vol. 15
·期 11
·5945
·
IF 2.5
Lia Wang,Xu He,Lan Liang,Yanshan Wang,Beibei Yan,Guanyi Chen,Ning Li,Li’an Hou
The conventional Fenton process generates large amounts of Fenton sludge during wastewater treatment. Achieving effective utilization of Fenton sludge and reducing its production remain pivotal challenges. In this study, Fenton sludge biochar catalysts (Cat) were prepared using Fenton sludge via pyrolysis. In addition, chemical oxygen demand (COD) from secondary effluent was removed by Fenton sludge biochar catalysts activated with H2O2/Fe(VI). Specifically, the removal efficiency of COD could reach 46.2% in the Cat−2/H2O2/Fe(VI) system under weakly alkaline conditions. The mechanistic analysis confirmed that high-valent iron,•OH, O2•−, and1O2all participate in the degradation process. Furthermore, a continuous-flow reactor was applied to treat secondary effluent, with COD decreasing from 65 mg/L to 36 mg/L. This study provides new insights into the resource utilization of Fenton sludge and the treatment of complex wastewater.
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PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Han Zheng,Dongxu Pan,Ling Zhang,Guodong Yang,Zhengfa Li
NaNbO 3 - x Fe 2 O 3 bulk ceramics have been synthesized to investigate the effects of low-concentration Fe-doping on the crystal structure, dielectric and ferroelectric properties of NaNbO 3 ceramics. The results demonstrate that Fe element either incorporates interstitially into the crystal lattice or substitutes for Nb element at B-site of NaNbO 3 in the low doping range of x < 0.75 mol%. Interstitial doping of Fe reveals a unique broken-line-shaped P - E hysteresis loop with lower remnant polarization P r . Compared to interstitial doping of Fe atom, the substitution of Fe 3+ ion for Nb 5+ ion can result in more fine and uniform-distributed grains, thereby improving the electrical breakdown strength E b . When the Fe-doping concentration of x ≥ 0.75 mol% exceeding its solid solubility, the precipitation of second phase Fe 2 O 3 at grain boundaries occurs. Then the heterogeneous interfacial polar layers between Fe 2 O 3 and NaNbO 3 are constructed, and the interfacial-charge effect increases the peak value of dielectric constant to 4500 at room temperature and maximal polarization P max up to 43 μC cm −2 . Furthermore, Fe-doping induces the accumulation of space charges around domain walls, thus, those charged domain walls generate negative dielectric constant at their specific resonant frequencies, by coupling with the forced vibration of space charges under alternating electric fields. This study reveals the influencing mechanisms of magnetic element Fe-distribution states on the structure and some physical properties of NaNbO 3 ceramics, providing valuable insights for further design of high-energy-storage NaNbO 3 -based ceramic systems.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120944
·
IF 7.2
Yong Xiang,Li Xu,Guoji Liu
Efficient recovery of Au(III) from electronic and industrial waste streams is of both economic and environmental importance. Herein, a pore-regulation strategy was developed to construct hierarchically porous NH 2 -MIL-101(Fe 1-x Cu x ). By employing 2-aminoterephthalic acid to coordinate simultaneously with Fe 3 + and Cu 2+ , the unstable Cu–O bonds were selectively removed through a mild acid-soaking treatment, thereby generating enlarged channels and hierarchical micro–mesoporous structures. The optimized framework achieved an Au(III) adsorption capacity of 944 mg g −1 , which was ∼30.7 % higher than that of unmodified NH 2 -MIL-101. Mechanistic studies demonstrated that the hierarchical pore architecture not only facilitated mass transfer but also enhanced accessibility of active sites, synergistically contributing to the superior adsorption performance. This work highlights that rational pore-channel engineering around adsorption sites can substantially boost the recovery efficiency of reducible precious metals, offering a novel design paradigm for advanced MOF-based adsorbents.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Asim A. Mohammed,Zhenfei Li,Bo Liu,Dong Yan,Jian Li,Lichao Jia
Protonic ceramic fuel cells (PCFCs) are highly efficient energy conversion devices that operate at relatively low temperatures. Enhancing their performance strongly relies on developing cathode materials with high electrocatalytic activity. This study presents a double-doped perovskite material, Pr 1.5 La 0.3 Ba 0.2 Ni 0.9 Fe 0.1 O 4+δ (PLBNF), where the electrochemical properties are significantly improved through composition and structural tuning. Comprehensive characterization confirms that the co-doping strategy effectively enhances the hydration capability, oxygen reduction reaction (ORR) activity, and operational stability. At 700 °C, the polarization resistances of the PLBNF cathode and the PLBNF-BZCYYb composite cathode are 0.11 and 0.08 Ω cm 2 , respectively, with peak power densities reaching 1012 and 1277 mW cm −2 . Fuel cell tests demonstrate excellent operational stability for the PLBNF-BZCYYb air electrode, indicating its strong potential for application in high-performance proton-conducting ceramic fuel cells. This work provides new insights into the development of efficient fuel cell materials and advances related energy technologies.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 21
·12049-12057
·
IF 4.4
Zhang Ming,Zhao Fengqi,Jiang Yifan,Li Na,Li Hui,An Ting,Qin Zhao,Jiang Zhoufeng
Various graphene-salen iron nanocomplex S-551-Fe, S-602-Fe, S-902-Fe, S-590-Fe, S-792-Fe and S-550-Fe were successfully synthesized using different coupling agents. The microstructure, composition and structure of the prepared graphene-salen iron nanocomplex were characterized by SEM, EDS, FTIR, XPS and RAMAN routes. The results showed the successful fabrication of graphene-salen iron nanocomplex and their two-dimensional structure. In addition, the catalytic property of the graphene-salen iron nanocomplex on the pyrolysis property of TKX-50 was investigated via DSC method, and the kinetic data was calculated by linear and nonlinear models. The positive effects of the synthesized graphene-salen iron nanocomplex for TKX-50 pyrolysis were confirmed, and the impact on the second pyrolysis procedure of TKX-50 is more significant. Among the nanocomplex considered, the S-551-Fe has better catalytic property for TKX-50 pyrolysis, and the activation energy ( E a ) of TKX-50 decreased from 163.50 to 135.55 kJ·mol −1 in the conversion degree of 0.2 ~ 0.8. In addition, the catalytic mechanism of preferred S-551-Fe for TKX-50 pyrolysis was disclosed via in situ FTIR and gas phase MS methods. This study is helpful to the precise design of graphene iron coordination catalysts and the disclosure of their catalytic mechanism for TKX-50 pyrolysis.
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Materials Today Energy
·
2020
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IF 5.604
Ziqi Zhang,Linchuan Cong,Zhuochen Yu,Lina Qu,Weimin Huang
Hydrogen is one of the most desirable sources with large energy density . Electrocatalysis of hydrogen evolution reaction is a promising way to produce hydrogen since it can be powered by renewable energy such as solar and wind energy . However, the mainstream electrocatalyst is noble metal (Pt/Ru/Ir), which is expensive and rare. It is necessary to develop non-noble metal catalysts toward HER from the perspective of sustainable development and long-term environmental conservation. Therefore, this paper provides a cheap and feasible way to synthesize the Fe–Ni bimetallic N-doped carbon framework (Fe–Ni@NCF). The prepared Fe–Ni@NCF exhibits the desired overpotential of 219 mV at 10 mA cm −2 in alkaline and 259 mV at 10 mA cm −2 in acidic solution, respectively. Besides, it exhibits similar current density loss as commercial Pt/C after 10,000 segments of CVs, which suggests satisfactory durability.
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IEEE TRANSACTIONS ON MAGNETICS
·
2019
·Vol. 55
·期 12
·1-7
·
IF 1.651
Wentao Hu,Xi’an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Yawei Li,Jian Wang
Fe/ZrSiO4 composite compacts with high thermal stability and excellent soft magnetic performance were prepared successfully by mechanical milling and spark plasma sintering. The effect of ZrSiO4 content on microstructure and magnetic properties of the Fe/ZrSiO4 composite compacts was investigated in detail. ZrSiO4 could be coated uniformly on the surface of Fe particles. With the increasing ZrSiO4 content, the core losses are effectively reduced, but the effective permeability and the saturation magnetic magnetization gradually decrease, while the coercivity has shown the opposite trend accordingly. The composite compact with 7.5 wt% ZrSiO4 has shown the superior structure and soft magnetic properties such as high saturation magnetic magnetization (202.20 emu/g), stable effective magnetic permeability (29.39), and lower core loss (4.53 W . kg-1 at 5 kHz). The results indicated that the Fe/ZrSiO4 composite compacts had potential application prospects in electromagnetic conversion equipment at medium and high frequencies.
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 19
·6518
·
IF 4.927
Xinjiang Zhang,Meng He,Yongzhong Zhan,Wenchao Yang,Kaifeng Wu
Copper matrix composites have a wide application as magnetic conductive materials, electromagnetic materials, electrical discharge machining materials, etc. Such materials are expected to have a good combination of excellent electrical conductivity and good mechanical strength. In this work, micro/nano hybrid reinforcements with Fe microspheres and reduced graphene oxide (rGO) nanosheets were developed for copper matrix composites. The rGO/Fe/Cu powders were firstly wet-mixed and then densified by the vacuum hot-pressing sintering to obtain the bulk compacts. Microstructure, electrical conductivity and mechanical properties of such compacts were investigated. Microstructural result of as-sintered compacts shows that the Fe microspheres could distribute in the matrix uniformly, and rGO nanosheets exhibit both agglomerated and dispersed states. The grain size of Cu matrix decreased with the increase of the rGO content. Hardness, compression and tensile 0.2% yield strength of the as-sintered compacts were improved evidently by the addition of the hybrid Fe/rGO, comparing with pure Cu and single Fe-added composites. However, a lower electrical conductivity appeared in the more rGO-added composites, but still reached more than 33.0% international annealing copper standard (IACS). These performance change could be sought in the spatially geometrical distribution and characteristics of such micro/nano Fe/rGO hybrid addition, and the relevant mechanisms were discussed.
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Water Supply
·
2021
·Vol. 22
·期 1
·208-219
·
IF 1.033
Fu Xiaori,Wei Xinyan,Zhang Wei,Yan Wupeng,Wei Peng,Lyu Shuguang
The addition of hydroxylamine hydrochloride (HAH), ascorbic acid (ASC), sodium ascorbate (SAS) to the OA-Fe(II)/SPC system could promote the generation of HO • by accelerating Fe(II)/Fe(III) recycles and H 2 O 2 decomposition. The enhancement of HAH on HO • generation surpasses ASC and SAS in the OA-Fe(II)/SPC system. The generation of O 2 •− was also enhanced by HAH, ASC and SAS, and more significant promotion of O 2 •− generation was observed with ASC and SAS addition. More effective benzene removal was achieved in an OA-Fe(II)/SPC system with suitable HAH, ASC and SAS addition, compared to the parent system. Excessive HAH, ASC or SAS had a negative effect on benzene removal. Results of scavenger tests showed that HO • is indeed the dominant free radical for benzene removal in every system, but the addition of HAH, ASC and SAS increased the contribution of O 2 •− to benzene degradation. HAH, ASC and SAS enhanced OA-Fe(II)/SPC systems could be well utilized to acidic and neutral conditions, while HCO 3 − , high concentration of HA and alkaline conditions were not favorable to benzene removal. Moreover, the addition of HAH, ASC and SAS are conducive to benzene removal in actual groundwater, and HAH was the optimal reducing agent for the enhancement of the OA-Fe(II)/SPC system. Benzene removal performance in an RA-OA-Fe(II)/SPC system was investigated. HAH is more conducive to HO • generation than ASC and SAS. Significant promoted generation of O 2 •− was observed with ASC and SAS addition. HAH, ASC and SAS weakened negative effects of the solution matrix on benzene removal. HAH, ASC and SAS are conducive to benzene removal in actual groundwater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yongxiang Jiang,Yang Liu,Jia Bao,Xin Wang,Xiaomin Hu
Emerging Contaminants (ECs) in water bodies pose significant environmental concerns. Adsorption technology, known for its low cost, high efficiency, and ease of use, is a promising solution for ECs removal. This study investigated the adsorption performance of MIL-101(Fe), an iron-based metal-organic framework (MOF), for ECs with different molecular sizes. Sodium p-perfluorous nonenoxybenzenesulfonate (OBS), diclofenac sodium (DCF), and tetracycline hydrochloride (TCH) were selected as representative ECs, covering PFAS substitutes, NSAIDs, and antibiotics. MIL-101(Fe) exhibited specific surface area, excellent mesoporous structure and abundant surface active sites, enabling efficient adsorption. Under optimized conditions (pH = 5.8, 6, and adsorbent dosages 9, 40, 20, and 20 mg), removal efficiencies for OBS, DCF, and TCH reached 95.9 %, 97.5 %, and 86.4 %, respectively. Cyclic tests showed stable performance after five adsorption-desorption cycles. Kinetic studies indicated that OBS followed a pseudo-first-order model, while DCF and TCH adhered to a pseudo-second-order model. The maximum adsorption capacities for OBS, DCF, and TCH were 945.1, 1595.9, and 439.5 mg·g −1 , respectively. Adsorption mechanisms revealed that smaller molecules like OBS and DCF easily entered the mesopores, while larger TCH molecules faced diffusion restrictions. The molecular interactions among OBS, DCF, and TCH involved electrostatic attraction toward -SO₃ − groups and pore filling in OBS, diffusion into the pore interior followed by hydrogen bonding with -NH₂ and π-π stacking in DCF, and surface-confined hydrogen bonding with -OH/-NH₂ and π-π interactions in TCH. This study provided a theoretical basis for efficient treatment of ECs with various molecule structures by Fe-MOFs adsorption materials.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xueyan Li,Chaojie Lyu,Dandan Cui,Senlong Zhang,Jiarun Cheng,Hanyu Guo,Chaojie Lyu,Yiming Liu
For the intrinsic limitations of CoP in alkaline water splitting (irrational electronic structure, poor conductivity, and agglomeration-caused low active site utilization), this work puts forward a bifunctional optimization strategy: "Fe-doping electronic modulation coupled with rGO support synergistic enhancement", and synthesizes the Fe-CoP@rGO composite catalyst (Fe-doped CoP nanoparticles anchored on rGO) via wet-chemical method and phosphidation. The introduction of Fe induces electron rearrangement by substituting Co atoms in CoP lattice significantly increases the proportion of highactivity Co 3+ sites and optimizes the adsorption energy barriers of *H/*OH intermediates. Meanwhile, the high conductivity of rGO constructs an efficient electron transport network, and its large specific surface area inhibits nanoparticle agglomeration through steric hindrance, enhancing the electrochemical active surface area (ECSA) twice that of pure CoP.Bifunctional catalytic performance tests show that Fe-CoP@rGO achieves low overpotentials of 86.2 mV (HER) and 285 mV (OER) at 10 mA cm -2 , which are significantly superior to those of CoP@rGO. When assembled into an overall water splitting device, it only requires 1.61 V to reach 10 mA cm -2 , with no performance degradation after 24 h of continuous operation in 1 M KOH and a Faraday efficiency close to 100%. This study provides a clear structure-activity relationship and a scalable optimization pathway for designing high-performance and stable non-noble metal bifunctional electrocatalysts through the synergistic effect of electronic structure modulation and support function enhancement
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