LANGMUIR
·
2026
·
IF 4.4
Qiang Zhang,Zhenghua Qian,Xueyang Liu,Shuai Wang,Yanbo Qiao,Xiaofeng Liu
The sequestration of Sr2+ remains a significant challenge in the treatment of radioactive liquid waste. In this work, we studied the synthesis and characterization of sodium titanate (NTO) and Fe-modified sodium titanate (Fe-NTO) for the removal of Sr2+ from complex aqueous environments. The introduction of Fe species was accompanied by an expanded interlayer spacing of the sodium titanate phase, which may improve Sr2+ accessibility and influence adsorption behavior. Adsorption kinetics and isotherms of Fe-NTO could be described by the pseudo-second-order model and the Langmuir equation, respectively, giving an enhanced capacity of 173.92 mg g–1 as compared to pristine NTO (151.03 mg g–1). In complex solution matrices, Fe-NTO maintained effective Sr2+ uptake in simulated seawater, although the Sr/Ca discrimination was modest. In simulated waste liquid of the thorium molten salt reactor nuclear energy system (TMSR), Fe-NTO exhibited strong Sr2+ adsorption with a high distribution coefficient of 1.47 × 105 mL g–1, while also showing strong uptake of other multivalent ions. Combined Raman, XPS, postadsorption XRD, and ICP-OES analyses support that Sr2+ sequestration involves electrostatic attraction, Na+/Sr2+ ion exchange, and weak interactions with oxygen-containing sites in the titanate structure. These findings demonstrate the potential of Fe-NTO for effective Sr2+ sequestration in complex aqueous matrices, including simulated TMSR-related waste liquid, while underscoring the need for further optimization of ion selectivity in multicomponent systems.
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高影响因子
Materials
·
2026
·Vol. 19
·期 10
·1926
·
IF 3.7
Liuyang Zheng,Chaohui Guo,Zijuan Du,Juan Han,Ang Qiao,De Fang,Haizheng Tao
Meltable metal–organic frameworks (MOF) are essential for the formation of MOF glasses, which have emerged as a new family of functional materials offering promising potential for applications in gas separation, luminescence, energy storage, and beyond. Herein, the synthesis of iron-based zeolitic imidazolate framework (ZIF) crystals, specifically Fe3(Im)6(HIm)2, where Im is imidazolate, is reported. Upon the substitution of some Im linkers with a secondary ligand, 5,6-dimethylbenzimidazole (dmbIm), it was found that such substitution induces the formation of new phases: one phase exhibits meltability and subsequent glass formation, while another phase [Fe3(Im)1.56(dmbIm)4.44(HIm)2] is non-meltable. Through structural characterizations, the configuration of the tetrahedral [Fe-linkers] units was revealed to be crucial in determining the meltability of Fe-ZIF. The incorporation of a large secondary ligand hinders the occurrence of melting. This work provides an insight into how ligands affect the accessibility of the liquid state of MOFs, showing a practical strategy for designing meltable MOFs.
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 19
·4030
·
IF 4.6
Haibo Jiang,Lin Xu,Qingrun Meng,Xu Feng,Junxuan Wang,Yankai Li,Junjie Li
Introducing hierarchical structure into zeolites or synthesizing two-dimensional (2D) zeolite nanosheets have drawn much attention in catalysis and separation process due to the improvement in zeolites’ diffusion properties. In this study, Fe incorporated on the MFI zeolite framework (Fe-MFI) with the nanosheet morphology and unique hierarchical pore structure was successfully synthesized and applied for the adsorption and degradation of Rhodamine B (RhB) in a Fenton-like reaction in the presence of H2O2. The synthesis involved a seed-directed hydrothermal method in the presence of NH4F and a subsequent NaOH treatment made the synthesized hierarchical Fe-MFI nanosheets (Fe-20-10) characterized by abundant highly dispersed framework Fe3+species. As a result of these features, the Fe-20-10 showed excellent ability of adsorption and degradation efficiency of RhB, and enhanced durability due to negligible leaching of framework Fe3+species. Moreover, the hydroxyl radicals were determined as the main the reactive oxygen species of RhB degradation, and a possible adsorption–degradation pathway was proposed. This work offers guidance for developing high-performance Fenton-like degradation catalysts.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Jianfang Liu,Hongwei Huang,Jie Yang,Laishuan Liu,Yu Li
A series of Au/Co x Fe 3- x O 4 catalysts was synthesized using the sol-deposition method by depositing 2–5 nm Au particles on Fe-doped Co 3 O 4 . Co 2 FeO 4 , with a Co/Fe molar ratio of 2:1, exhibited higher specific surface area , Co 3+ /Co 2+ ratio, and oxygen vacancy content compared to Co 3 O 4 . As a result, it displayed better performance in CO oxidation , achieving a total conversion temperature ( T 100 ) of 96 °C. Au greatly improved the catalytic efficiency of all Co x Fe 3- x O 4 samples, with the 0.2%Au/Co 2 FeO 4 catalyst achieving a further decrease in T 100 to 73 °C. Stability tests conducted at room temperature on the 1%Au/Co x Fe 3- x O 4 catalysts demonstrated a slowed deactivation rate after Fe-doping. The reaction pathway for CO oxidation catalyzed by Au/Co 2 FeO 4 followed the Mars-van Krevelen mechanism.
研究领域:
材料科学
·
催化化学
·
纳米技术
·
环境化学
·
能源化学
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Dandan Liu,Xueyan Li,You Li,Shu Yin,Jiajia Liu,Jiatao Zhang
Highly sensitive and selective gas sensors hold great potential in disease diagnosis. However, the rational design of non-noble-metal-based, high-efficiency sensing materials for trace gas detection remains a crucial challenge. Herein, a chemiresistive sensor that can detect parts per billion (ppb)-level acetone was realized based on three-dimensional (3D) α-Fe2O3/ZnO nanocages, which were achieved by a simple encapsulation and calcination process. In particular, we found that Fe species play an intriguing role in the evolution from Fe-ZIF-8 to heterogeneous α-Fe2O3/ZnO nanocages. α-Fe2O3 functionalization empowered the α-Fe2O3/ZnO nanocage-based sensor with a high response of 45.25, an ultrafast response (7 s) and recovery (6 s) time toward 50 ppm of acetone, a limit of detection (LOD) of 500 ppb, and superior selectivity. Moreover, in situ Fourier transform infrared analysis allowed one to devise of an acetone sensing mechanism for dissociative acetone adsorbed on the α-Fe2O3/ZnO nanocages, involving the first oxidation of acetone to form formate and acetate complexes, followed by further oxidation to CO2 and H2O. The enhanced acetone sensing performance can be attributed to the high specific surface area, abundant oxygen vacancies, well-tuned heterojunction, and optimal acid–base property.
研究领域:
材料科学
·
分析化学
·
生物医学工程
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 43
·23103-23112
·
IF 14.511
Xuqi Lin,Jingguo Gao,Kehua Zhong,Yongcong Huang,Hurong Yao,Yingbin Lin,Yongping Zheng,Zhigao Huang,Jiaxin Li
For high-performance silicon–carbon (Si–C)-based anode materials used in high-energy-density lithium-ion batteries (LIBs), there is an urgent need to rationally construct a stable solid electrolyte interface (SEI) film and load a high proportion of silicon content, which is closely related to the capacity and cycling stability of the electrode. Herein, composites of Fe/Fe3C-modified carbon nanofiber–coated Si nanoparticles (Fe/Fe3C–Si@CNFs) were synthesized via a simple electrospinning method. These composites effectively overcome the volume change effect, poor interfacial compatibility and low conductivity, delivering excellent LIB performance. Tested at 2.0 A g−1, Fe/Fe3C–Si@CNFs provides a high reversible capacity of 956.5 mA h g−1 with a coulombic efficiency of more than 99.5% even after 4000 ultra-long stable cycles. The high conductivity of the Fe/Fe3C embedded in the CNF framework can promote e− transfer and boost the Li+ diffusion kinetics in the electrode. The catalytic activity of Fe/Fe3C helps to enhance the interfacial compatibility, grow a balanced stable SEI film and promote the long-cycle stability of the electrode at room temperature.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
·
电池技术
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PHYSICAL REVIEW B
·
2023
·Vol. 107
·期 9
·094104
·
IF 3.7
Jiyu Hu,Zheng Chen,Meiling Wang,Min Wang,Shouguo Wang,Ganhong Zheng,Xin Liang,Wenjian Lu,Yongqing Ma
${\mathrm{Co}}_{2.5}{\mathrm{Fe}}_{0.5}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$ single crystal was grown by a flux method, and its magnetocaloric effect and critical behavior were systematically investigated. Significant changes in magnetic properties and critical behavior were observed in Fe-doped ${\mathrm{Co}}_{3}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$, compared with undoped ${\mathrm{Co}}_{3}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$. Specifically, the magnetization of ${\mathrm{Co}}_{2.5}{\mathrm{Fe}}_{0.5}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$ measured at a low magnetic field ($H<500$ Oe, $H\ensuremath{\parallel}c$ axis) does not show the thermal hysteresis phenomenon, whereas it was observed in ${\mathrm{Co}}_{3}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$ near ${T}_{\mathrm{c}}$, which is characteristic of a typical second-order phase transition. Previous reports usually attribute the suppression of ferromagnetism by the substitution of Fe for Co to the decrease in the number of $3d$ electrons. Herein, according to the first-principles calculation, the magnetic moments of dopant Fe align antiparallelly to those of Co atoms, which is also the possible reason for the decrease in magnetization. The critical behavior analysis shows that the critical exponents of the Fe-doped sample around magnetic transition are very close to theoretical values of the mean-field model. Furthermore, the exchange interaction distance $J(r)\ensuremath{\approx}{r}^{\ensuremath{-}4.65}$ and the Rhodes-Wolfarth ratio (RWR) (RWR > 1) prove the long-range itinerant ferromagnetism. The hybridization between the $3d$ orbitals of Fe/Co and the orbitals of $\mathrm{Sn}\text{\ensuremath{-}}5p/\mathrm{S}\text{\ensuremath{-}}3p$ may be an important factor for long-range itinerant ferromagnetism. The zero-field cooling magnetization ($H=100$ Oe, $H\ensuremath{\parallel}\phantom{\rule{0.16em}{0ex}}ab$ plane) undergoes the spin reorientation around 76 K, maybe because the magnetic moments of Fe, aligning antiparallelly to moments of Co atoms, reorient from out of plane to in plane. The critical behavior analysis shows that the first-order phase transition may occur below ${T}_{\mathrm{c}}$ in the case of the $H\ensuremath{\parallel}\phantom{\rule{0.16em}{0ex}}ab$ plane.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Wenyan He,Siyan Xu,Kaijie Ye,Yinuo Dan,Moli Chen,Jia He,Xiaolong Shi
The removal of sterically hindered diethylenetriamine penta(methylene phosphonic acid) (DTPMP) from wastewater is challenging because its bulky molecular architecture impedes both intraparticle diffusion and effective coordination with conventional adsorbents. To address this limitation, a cooperative dual-functional covalent organic framework (Fe–NH 2 /COF 4 ) was synthesized via sequential Fe incorporation followed by nitro-to-amine reduction. The resulting material exhibits a high specific surface area of 501.6 m 2 /g and a well-matched pore size of 17.16 Å, closely aligning with the DTPMP molecular dimension (∼15.7 Å). Under the optimized conditions, Fe–NH 2 /COF 4 achieves a removal efficiency of 93.85% and an adsorption capacity of 338.2 mg/g, reducing effluent total phosphorus to below 0.5 mg/L (the Grade 1 A discharge standard). Mechanistic investigations, including experiments and DFT calculations (adsorption energy: −1.07 eV), reveal synergistic contributions from Fe–phosphonate coordination, electrostatic attraction, and hydrogen bonding. Molecular dynamics simulations confirm rapid intrapore diffusion (D = 5.7 × 10 −7 cm 2 /s). The adsorbent demonstrates good reusability (82% capacity retention after five cycles) and remarkable robustness against coexisting ions and humic acid (HA), retaining an adsorption capacity of 332.5 mg/g even in simulated wastewater. Collectively, these findings establish a steric-hindrance-resistant adsorption paradigm and provide rational design guidelines for dual-site COF adsorbents targeting refractory organophosphorus pollutants.
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International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 6
·4902
·
IF 4.614
Ruiqi Wu,Ning Liu,Chengna Dai,Ruinian Xu,Ning Wang,Gangqiang Yu,Biaohua Chen
N2O is a greenhouse gas and a candidate oxidant. Volatile organic pollutants (VOCs) have caused great harm to the atmospheric ecological environment. Developing the technique utilizing N2O as the oxidant to oxidize VOCs to realize the collaborative purification has significant importance and practical value for N2O emission control and VOC abatement. Therefore, the study of N2O catalytic oxidation of tert-butanol based on zeolite catalysts was carried out. A series of molecular sieves, including FER, MOR, ZSM-5, Y, and BEA, were selected as the catalyst objects, and the 1.5% wt Fe and Co were, respectively, loaded on the zeolite catalysts via the impregnation method. It was found that the catalytic performance of BEA was the best among the molecular sieves. Comparing the catalytic performance of Fe-BEA under different load gradients (0.25~2%), it was found that 1.5% Fe-BEA possessed the best catalytic activity. A series of characterization methods showed that Fe3+content in 1.5% Fe-BEA was the highest, and more active sites formed to promote the catalytic reaction. The α-O in the reaction eventually oxidized tert-butanol to CO2over the active site. The Co mainly existed in the form of Co2+cations over Co-BEA samples; the 2% Co-BEA possessing higher amounts of Co2+exhibited the highest activity among the prepared Co-BEA samples.
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POWDER TECHNOLOGY
·
2023
·
IF 5.2
Yuming Xi,Yangcheng Lu
In this work, a facile one-pot two-step mechanochemical technology is firstly developed to prepare Fe/Mn-based binary hexacyanoferrates (Na x (FeMn)[Fe(CN) 6 ] y , FeMnHCF)/carbon composites by coupling in-situ construction of the conductive network and solid-state reaction. It is found that construction of hierarchical conductive network is favorable to improve the rate performance and cycling stability, with an 80.5% capacity retention over 1000 cycles at 360 mA/g. Furthermore, the capacity attenuation and stabilization mechanisms are investigated by GITT, EIS , and ex-situ XRD . The capacity attenuation in the early stage can be attributed to the large charge transfer resistance, while in the latter stage the long cycling stability is ascribed to the solid solution reaction with the mitigated stress distortion during the desodiation/sodiation process. Overall, the proposed mechanochemical synthesis of Fe/Mn-based binary hexacyanoferrate shows great potential in environmental friendliness and cost-saving production as well as comprehensive product performance.
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MOLECULES
·
2023
·Vol. 28
·期 11
·4411
·
IF 4.6
Fuhua Wei,Kui Wang,Wenxiu Li,Qinhui Ren,Lan Qin,Mengjie Yu,Zhao Liang,Meng Nie,Siyuan Wang
This work studies the use of Fe/Ni-MOFs for the removal of ciprofloxacin (CIP) in wastewater. Fe/Ni-MOFs are prepared by the solvothermal method and characterized by X-ray diffraction (XRD), a scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), and a thermal gravimetric analyzer (TG). Under the conditions of the concentration of 50 ppm, a mass of 30 mg, and a temperature of 30 °C, the maximum adsorption capacity of ciprofloxacin removal within 5 h was 232.1 mg/g. The maximum removal rate was 94.8% when 40 mg of the Fe/Ni-MOFs was added to the solution of 10 ppm ciprofloxacin. According to the pseudo-second-order (PSO) kinetic model, the R2values were all greater than 0.99, which proved that the adsorption theory of ciprofloxacin by Fe/Ni-MOFs was consistent with the practice. The adsorption results were mainly affected by solution pH and static electricity, as well as other factors. The Freundlich isotherm model characterized the adsorption of ciprofloxacin by Fe/Ni-MOFs as multilayer adsorption. The above results indicated that Fe/Ni-MOFs were effective in the practical application of ciprofloxacin removal.Keywords:metal–organic frameworks;antibiotics;adsorption
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 11
·3383-3391
·
IF 2.936
Zhang Luping,Tu Xuewei,Han Weihang,Chen Liangchen,Chen Yutong,Zheng Hui
As the main resource of greenhouse gas, CO 2 needs to be fixed into different chemicals to relieve the environmental problem. Fe-based catalyst and g-C 3 N 4 have received extensive attention due to their easy preparation, low cost, and environmental friendliness. Herein, a heterogeneous catalyst system consisting of rich-electron g-C 3 N 4 and strong electron-withdrawing groups Fe-complex [Fe(bpy)(CO) 2 (Cl) 2 ] was developed, which could promote electron transfer and enhance the electronic interaction for fixing CO 2 . o -phenylenediamine substrates with different electron-donating/withdrawing groups were employed to fix CO 2 into high-valued heterocycle benzimidazoles. The optimum reaction conditions were examined by orthogonal experiments. A series of benzimidazole derivatives were synthesized with yield up to 98%, which indicated the catalyst had the ability of fixing CO 2 . This catalyst provides a new pathway for fixing CO 2 into valuable benzimidazole derivatives. Graphical Abstract
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