COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Hao Lu,Lu Huang,Jingle Chen,Mingfeng Sun,Liguang Wu,Ting Wang
To address the efficient separation of refractory small-molecule pollutants such as p -nitrophenol (PNP) from industrial wastewater, bimetallic Co-Fe hydroxide nanoparticles were synthesized via a reverse microemulsion method and incorporated into polymer matrices. Initial studies on hybrid membranes with polyvinylidene fluoride (PVDF) matrices demonstrated enhanced hydrophilicity (contact angle reduction from 77.7° to 64.9°) and antifouling performance (85 % flux recovery rate), but their large pore size (∼70 nm) limited PNP rejection (22.5 %). To overcome this problem, polysulfone (PSF) was selected as an alternative matrix substrate. By systematically adjusting the film-forming time (15–50 min) during phase inversion, tight ultrafiltration membranes with controlled pore structures were fabricated. Prolonged film-forming time (30 min) optimized the solvent-nonsolvent exchange kinetics of the obtained PSF-3 membrane, yielding a dense selective layer with a narrow pore size distribution (3–8 nm) and molecular weight cut-off. This membrane achieved a PNP rejection rate of 71 % compared to 5 % of the PVDF membrane through synergistic "size sieving-hydroxyl adsorption" while maintaining low salt rejection (<15 %) and high flux stability (<15 % flux decline rate over 6 h). Hydrophilicity (49.6° contact angle) and antifouling performance (85 % flux recovery rate after four cycles) were significantly enhanced by uniformly dispersed nanoparticles. This study highlights the critical role of film-forming time in tailoring membrane architecture and performance, providing a novel strategy for efficient small-molecule separation from saline wastewater.
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APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Shengji Wu,Menglin Lin,Xijie Cheng,Xuyan Zhao,Fan Yang,Ying Xie,Lei Che,Lijiang Hu,Wei Yang
Electrocatalytic nitrate reduction (NO 3 RR) process presents a green and sustainable approach for mitigating environmental nitrate pollution while enabling ambient NH 3 synthesis. However, it was hindered by the challenge of developing non-noble electrodes that exhibited both high activity and low cost. Herein, iron and copper-doped ZIF-8 electrocatalysts (FeCuO x @CN) with varying Fe/Cu molar ratios (Fe/Cu = 2/1, 1/1 and 1/2) were synthesized. The process involved doping iron into the ZIF-8 precursor, followed by pyrolysis at 700, 800 or 900°C to embed copper with ZIF-8. Synergistic effects between Fe and Cu were observed in the FeCuO x @CN catalysts and an appropriate molar ratio of Fe/Cu was found to effectively balance the reduction rates of NO 3 – and NO 2 – , leading to a high NH 3 yield rate. Among the synthesized catalysts, Fe 1 Cu 2 O x @CN-800 exhibited the best NO 3 RR performance, achieving an NH 3 yield rate of 1975.4 μg h −1 mg cat -1 and a faradaic efficiency of 98.3 % at −0.6 V ( vs. RHE). Furthermore, it exhibited excellent cycling stability, maintaining a faradaic efficiency above 96 % over 20 cycles. The NO 3 RR mechanism over Fe 1 Cu 2 O x @CN-800 was determined to be proceeded with a sequence of deoxygenation steps: NO 3 – → *NO 3 → *NO 2 → *NO → *NOH → *NH 2 O → *NH 2 OH → *NH 2 → *NH 3 .
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Jian Sun,Haobo Ma,Jiafei Ren,Xia Han,Juan Liu
The practical application of photo-Fenton processes to degrade contaminants is limited by their poor stability under varying pH environment. The requirement of supplementary oxidants and iron additives increase the cost. This reports the construction of Z-scheme heterojunction with Fe coordinatively unsaturated metal sites (Fe CUMSs) based on g-C 3 N 4 as the highly efficient photo-Fenton catalysts. The optimized catalyst presented stable MB degradation efficiency of 115.32 mg g −1 (pH 4.0), 113.44 mg g −1 (pH 7.0), and 106.35 mg g −1 (pH 9.0) in 30 mins without any oxidants and iron-containing additives. The self-feeding photo-Fenton mechanism was studied in details, suggesting that Fe CUMSs improved the H 2 O 2 generation rate of g-C 3 N 4 to 6.23 μmol L −1 h −1 . A completely reversible Fe 2+ /Fe 3+ conversion process lead to persistent generation of hydroxyl radical to degrade MB without iron precipitation generation. This work presents a new strategy constructing self-feeding photo-Fenton catalytical system to remove contaminants for environmental remediation and sustainability.
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CRYSTENGCOMM
·
2025
·Vol. 27
·期 5
·678-686
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IF 2.6
Dongling Xie,Jianan Wang,Bo Huang,Yiyi Yang,Dunmin Lin,Chenggang Xu,Fengyu Xie
Rational design of viable routes to develop affordable and efficient oxygen evolution reaction (OER) catalysts is essential for advancing electrochemical water splitting, yet significant challenges remain, particularly in seawater. Here, we propose a ligand defect engineering strategy to modify the electronic structure of NH2-MIL-88B(Fe) using a monodentate ligand (acetic acid, AcOH), inducing ligand vacancies in NH2-MIL-88B(Fe) for oxygen evolution in an alkaline seawater electrolyte, thereby improving the performance of the electrocatalysts. The resulting defective MOFs (denoted as NH2-MIL-88B(Fe)-x) exhibited exceptionally high catalytic activity for OER, requiring low overpotentials of 313 and 329 mV at a current density of 100 mA cm−2 in 1 M KOH and simulated seawater (1 M KOH + 0.5 M NaCl) solutions, respectively. Experimental analyses revealed that the introduction of AcOH can modulate the d-band center of active sites in NH2-MIL-88B(Fe)-x and play a critical role in alleviating chloride ion (Cl−) corrosion, thereby enhancing catalytic stability in seawater. When directly used as an OER catalyst in an alkaline electrolyte, wind and solar power were harnessed to operate the NH2-MIL-88B(Fe)-x || Pt/C configuration to drive the electrolytic water reaction. Thus, the ligand defect strategy can be employed to design and prepare high-performance OER electrocatalysts, particularly for generating H2 through water electrolysis powered by renewable energy sources.
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Biomaterials Science
·
2025
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IF 5.7
Di Zhang,Luying Zeng,Xiangyu Chen,Shuiqing Zhou,Binghong Luo,Mingxian Liu
Atopic dermatitis is a typical chronic inflammatory disease with pathological characteristics of persistent immune activation and oxidative stress. The combined anti-inflammatory and antioxidant treatment can effectively block the inflammatory cascade while reducing oxidative damage. Halloysite nanotubes (HNTs) are the main component of the traditional Chinese medicine "Chishizhi", which shows the medicinal functions of astringency, hemostasis and astringency. However, the efficacy of HNTs alone in treating diseases is relatively weak, and its therapeutic effect can be improved by surface modification and drug loading. Herein, CuO-Fe3O4 nanoparticles were synthesized on the outer surfaces of HNTs by hydrothermal reaction. CuO-Fe3O4@HNTs has high SOD and CAT enzyme activities under neutral condition. Then, the nanozyme modified HNTs powder was prepared into sprayable hydrogels by introduction of sodium alginate (SA) and aloe vera extracts. Cell experiments confirmed that the hydrogel can promote HacaT cell proliferation within 0~200 μg/mL concentration. Through the mouse animal dermatitis model, CuO-Fe3O4@HNTs-SA composite hydrogel has a good therapeutic effect on atopic dermatitis. Comparing with the positive drug halcinonide solution, the CuO-Fe3O4 nanozymes incorporated hydrogel showed enhanced therapeutic effect, which shows promising prospects in the clinical treatment of atopic dermatitis.
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PubMed
高影响因子
Nanoscale
·
2025
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IF 5.1
Manoj Kumar Panjwani,Yuqi Liu,Shihao Han,Danish Khan,Shaoxia Yang,Feng Xiao,Pan Gao
Dual-atom catalysts (DACs) driven by peroxymonosulfate (PMS) activation have demonstrated significant potential for addressing the inherent scaling relationship limitation of reaction intermediates, but in-depth mechanistic insight into synergistic interactions between dual-metal sites remains elusive. The Fe–Mn DAC has been designed with the largest electronegativity difference among Fe-based metal pairs to enhance electron transfer and synergistic interactions. The Fe–Mn DAC exhibits exceptional catalytic performance for bisphenol A (BPA) degradation, achieving a reaction rate constant (kobs) of 1.36 min−1, and a turnover frequency to PMS concentration ratio of 34.0 L min−1 g−2, which significantly surpasses the performance of reported state-of-the-art DACs, SACs, and nanocatalysts. The log kobs value correlated well with the σ+ value (R2 = 0.80), indicating that the Fe–Mn DAC readily targets pollutants with strong electron-donating abilities. Besides, 1O2 plays a key role in the Fe–Mn DAC/PMS system for BPA degradation. Based on density functional theory calculations, Fe and Mn active sites with a large electronegativity difference effectively enhance the synergistic interactions and decouple the activation and stabilization of reaction intermediates to address the inherent scaling relationship limitation. This study provides a robust framework for the rational design of DACs to enable efficient and sustainable water treatment.
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PubMed
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Quan Liao,Lianpeng Sun,Huanzhong Deng,Siru Zhou,Mingxuan Li,Xinzhe Zhu,Chao Yang,Xiao-yan Li,Lin Lin,Ruo-hong Li
The bio-iron system effectively overcomes the bottleneck in the biosynthesis of medium-chain fatty acids (MCFAs) by enhancing extracellular electron transfer capability. However, the key structural characteristics and dynamic evolution of iron-based electron shuttles remain unclear, limiting system optimization and mechanistic understanding. Among the tested iron species in this study, Fe 3 O 4 exhibited the most favorable extracellular electron transfer performance and MCFAs production, highlighting its potential as an efficient electron shuttle. In addition, this study revealed that microorganisms can induce partial transformation of iron powder and Fe 2 O 3 into Fe 3 O 4 through redox cycling. In contrast, FeCO 3 lacked both structural reconfiguration ability and electron transfer activity, thus limiting MCFAs biosynthesis. Partial least squares regression model, combined with characterization analysis, identified the Fe(III)-O-Fe(II) structure as the key structural characteristics of the electron shuttle. Moreover, X-ray absorption fine structure analysis, interpreted through Marcus theory, demonstrated that bio-driven Fe O bond shortening reduces reorganization energy, while Fe Fe bond elongation expands the electron transfer network. This study elucidates, at the atomic level, the microbial mechanisms underlying the construction and regulation of iron-based electron shuttles, providing a theoretical foundation for the design of bioinspired materials and the optimization of bio-iron systems.
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Thermal Science and Engineering Progress
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2025
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IF 5.4
Yuetong Li,Qiuwan Shen,Shian Li
CuGa 2-x Fe x O 4 spinel catalysts were applied for methanol steam reforming (MSR). Results indicated that the increase in Fe 3+ doping altered the crystal structure. SEM and BET results indicate that the catalyst exhibits a particle structure. Fe-doping affects its morphology and surface area. The MSR experimental results demonstrated that CuGa 0.4 Fe 1.6 O 4 exhibited excellent catalytic performance. This is attributed to the change in the original lattice structure caused by Fe doping. Furthermore, the optimal operating conditions for MSR reaction were optimized. After the 40-hour stability test, the methanol conversion rate remained above 90 %, and the hydrogen production reached 6 mmol/min/g cat .
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Surfaces and Interfaces
·
2025
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IF 6.3
Jiangang Kang,Haihong Zhang,Yuehui He,Liang Wu,Hengdi Ye,Jinchao Wei
The novel Ni-Si intermetallic compounds are fabricated by elemental powder metallurgy. This study explores the synthesis of a series of catalysts (Ni-Si-M, M=Co, Fe, Mn) by alloying to augment the low-temperature efficiency of CO oxidation using Ni-Si intermetallic compounds. It is found the low-temperature catalytic activity of Ni-Si-Co, Ni-Si-Fe, and Ni-Si-Mn catalysts are significantly enhanced compared to the original Ni-Si. The catalytic activity among the catalysts ranks as follows: Ni-Si-Co > Ni-Si-Fe > Ni-Si-Mn > Ni-Si. The apparent activation energy (Ea) for Ni-Si-Co was the lowest at 57.3 kJ/mol, suggesting its efficient catalytic oxidation of CO. Additionally, the addition of Co, Fe and Mn elements actually promotes the generation of Ni 2+ as the CO adsorption site in the original Ni-Si. The addition of Co element also leads to the formation of Co 2+ as the adsorption site of O 2 in the process of CO oxidation reaction. The synergistic adsorption of Ni 2+ and Co 2+ to CO and O 2 promotes the CO oxidation reaction. Additionally, the catalysts demonstrate robust long-term stability in atmospheres containing H 2 O and SO 2 , with CO conversion initially suppressed but subsequently recovering and stabilizing at over 90%. This investigation offers novel insights into enhancing the low-temperature activity and stability of catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Xin Ding,Waqar Uddin,Hongting Sheng,Peng Li,Yuanxin Du,Manzhou Zhu
Recently, transition metal phosphides (TMPs) have been reported as a new kind of anode catalyst for oxygen evolution reaction (OER), and the composition of the material largely determines the performance of the catalysts. However, few reports explore how electrocatalytic performance of TMPs changed with the composition of the catalysts. We selected three different component Fe-based Prussian blue analogues (PBA) as precursors and transformed them into corresponding metal phosphides by simple heat treatment. By tuning the phosphidation temperature, a series of FeCoP, FeNiP, and FeMnP were obtained, in which FeCoP under a suitable phosphidation temperature at 400 °C exhibits most obviously porous structure and broadest distribution of pore size, which benefits for the mass transfer and oxygen release during OER. Besides, the charge-transfer resistance (R ct ) of TMPs has greatly decreased by introducing of Co in comparison of Ni and Mn, which accelerate the electron transport in OER. Due to the porous geometric structure and unique electronic structure, FeCoP-400 shows excellent and stable electrocatalytic activities of OER in 1 M KOH, with overpotentials of 261 mV at a current density of 10 mA cm −2 , superior to commercial RuO 2 and most OER electrocatalysts . Furthermore, FeCoP-400 exhibits outstanding stability with only 4% increase in potential during 24 h chronopotentiometry.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Liping Sun,Chao Li,Yong Yan,Yue Yu,Hao Zhao,Zijue Zhou,Feng Wang,Yi Feng
Single atom nanozymes (SAzymes) represent the state-of-the-art technology in nanomaterial-based catalysis, which have attracted attentions in catalysis, cancer treatment, disinfection and biosensing fields. However, numerous SAzymes suffered from low aqueous dispersion and without recognition capacity, which impeded their applications in bioanalysis . Herein, we engineered DNA onto SAzymes to obtain the DNA/SAzymes conjugates , which significantly improved the aqueous dispersion and recognition ability of SAzymes. We synthesized iron SAzymes (Fe–N–C SAzymes) as the catalytic nanomaterials, and investigated the interactions between Fe–N–C SAzymes and DNA. We compared A 15 , T 15 and C 15 adsorption of Fe–N–C SAzymes in HEPES containing 2 mM MgCl 2 . We found that 50 μg mL −1 Fe–N–C SAzymes produced nearly 100% A 15 adsorption, 90% T 15 adsorption and only 69% C 15 adsorption, indicating that adenine and thymine had higher adsorption affinity on Fe–N–C SAzymes. More importantly, DNA modification did not affect the peroxidase-like activity of Fe–N–C SAzymes and the bioactivity of the adsorbed DNA. Taking the advantage of the diblock DNA with one DNA sequence (adenine) binding to Fe–N–C SAzymes and the other DNA sequence (i.e., aptamer) binding to cancer cells, we designed Apt/Fe–N–C SAzymes for colorimetric detection of cancer cells, which offered new insights for the use of SAzymes in biomedicine .
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Mengxue Li,Juanjuan Wang,Nana Zhu,Yang Zong,Rui Jiao,Zhaoqi Zhu,Hanxue Sun,An Li
Fe–N–C catalysts are some of the most promising catalysts for the oxygen reduction reaction (ORR). However, there are still some problems in the pyrolysis of precursors, such as the destruction of the carbon skeleton and low utilization of active sites. In this work, we synthesized hollow pyridine N-containing conjugated microporous polymers (CMPs) by coupling polymerization. The bipyridine units in CMPs’ skeleton can anchor Fe3+ to form a stable coordination structure, which was effectively converted into Fe–N–C catalysts by one-step pyrolysis. Due to the rigid skeleton of precursors, the hollow structure was preserved in catalysts, which is favorable to O2 diffusion and mass transport of intermediates. X-ray photoelectron spectroscopy and Fe K-edge X-ray near-edge spectroscopy revealed approximate FeN4 structures within the framework of the catalysts. As a result, the resulting CMP-derived catalysts exhibited satisfactory ORR activity in alkaline media with a limiting current density of 4.40 mA cm–2. Furthermore, the Fe,N–C1–900 catalyst demonstrated exceptional methanol immunity with a mere negative shift of 0.01 mA cm–2 in limiting current density compared with the commercial Pt/C catalyst, indicating remarkable stability.
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