JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Silin Li,Hengyong Tu,Feng Li,Muhammad Tuoqeer Anwar,Lijun Yu
In order to improve the performance of intermediate temperature solid oxide fuel cells (IT-SOFCs), the effect of partial substitution of the transition metal M = Co, Cu, Fe and Mn for Ni in Nd 2 NiO 4+δ on the crystal chemistry, electrical conductivity , thermal stability, chemical reactivity with YSZ electrolyte and electrochemical performance has been systematically investigated. The electrochemical performances of the cathode materials are tested on planar NiO-YSZ anode-supported cells fabricated with YSZ as electrolyte in size of 50 mm × 50 mm. Compared to Nd 2 NiO 4+δ , each Nd 2 Ni 0.9 M 0.1 O 4+δ material shows a decrease in electrical conductivity and an increase in lattice volume, oxygen vacancy concentration and chemical reactivity with YSZ electrolyte. The cell with Nd 2 Ni 0.9 Co 0.1 O 4+δ cathode achieves the maximum power density of 530 mW cm −2 at 0.7 V at 800 °C. The cell with Nd 2 Ni 0.9 Cu 0.1 O 4+δ cathode is the most stable in short-term test. A small amount of B-site doping in Nd 2 NiO 4+δ does not cause any change in the cathode microstructure. The study demonstrates that a tradeoff between oxygen transport properties and electrical conductivity can be accomplished by appropriate selection of transition metal and level of cation B-site doping in Nd2NiO4+δ. Nd2Ni0.9M0.1O4+δ (M = Co, Cu) can be considered to be potential cathode materials in IT-SOFCs.
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PROCESS BIOCHEMISTRY
·
2017
·
IF 2.497
Hui Zhang,Mengya Li,Jie Li,Guangli Wang,Feng Li,Minghua Xiong
Nitrile hydratase (NHase) has attracted substantial attention for industrial applications to produce large-scale amides. Several NHases have been investigated for functional expression in Escherichia coli ( E. coli ). A Fe-type NHase was obtained from an acetamiprid-degrading bacterium, Pseudoxanthomonas sp. AAP-7 and functionally expressed in E. coli BL21 (DE3). No significant NHase activity was detected from the E. coli expressing either the NHase gene alone or NHase and P46K genes transcribed as one unit. Purified recombinant NHase, co-expressed with P46K on two separate plasmids, exhibited the maximal enzyme activity. Furthermore, a GST tag attached to the N-terminus of α subunit resulted in a slight increase in the solubility and stability of NHase compared with a His tag at the C-terminus of β subunit. When co-expressed with the chaperones GroEL-GroES, the yield of the soluble recombinant NHase was improved substantially, while a small decrease in NHase activity was observed. The putative activator P46K was strictly required for production of the recombinant NHase for full enzyme activity, although the chaperones GroEL-GroES appeared to assist NHase to fold properly. This study of the expression of a fully active Fe-type NHase would provide another example to enhance our understanding of NHase biosynthesis.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Zheng Cheng,Can Chen,Jieyang Huang,Teng Chen,Yang Liu,Xiangyang Liu
The nondestructive functionalization of aramid fiber is an important research direction. In this study, a kind of benzimidazole-contained aramid fiber, Poly- p -phenylene-benzimidazole-terephthalamide (PBIA) fiber, was modified by the coordination of benzimidazole unit in fiber structure with Fe 3+ . Further, the coordinatively unsaturated sites of Fe 3+ endow the modified fiber with active sites for the grafting of PEI. Model compound of PBIA unit, PBA, was utilized to confirm the whole process of modification. In comparison with that of the untreated fiber, the IFSS value of fiber with PEI grafted has an increase by 47%, owing to the chemical bond formed on the fiber/epoxy interface and the better wettability of resin to fiber. In all, the study presents a nondestructive functionalization of aramid fiber and can be employed in the modification of other benzimidazole-contained substrates.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Pengfei Yang,Jianhong Bi,Hua Zhang,Zhenyu Wu
Herein, we explored the efficacy of ethylenediaminetetraacetic acid (EDTA) intercalation modified layered double hydroxides (LDHs) composites for removing the anionic dye methyl orange (MO) from aqueous solutions. EDTA intercalated layered hydroxides (EDTA-Mg/Fe LDHs) with a 4:1 Mg/Fe molar ratio have been successfully prepared and thoroughly characterized using SEM-EDS, FTIR, XRD, XPS, UV-Vis and Zeta potential analysis. Batch adsorption experiments were conducted to evaluate the adsorption performance of the innovative adsorbent on MO. The results indicated successful EDTA loading into Mg/Fe LDHs, exhibiting excellent adsorption performance for MO. At pH 6.0, with a 0.03 g adsorbent dose, MO removal exceeded 91.10 % within 90 min, following a pseudo second order kinetic model. The maximum adsorption capacity reached 1207.43 mg/g, fitting well with the Redlich Peterson model. Thermodynamic parameters suggested a spontaneous and favorable adsorption process. Furthermore, we assessed the desorption and regeneration effectiveness of EDTA-Mg/Fe LDHs, emphasizing the importance of developing cost-effective and environmentally friendly adsorbents with practical applications and scientific significance.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Katam Srinivas,Zhuo Chen,Anran Chen,He Huang,Chengtao Yang,Fei Wang,Ming-qiang Zhu,Yuanfu Chen
Replacing platinum-based electrocatalysts with iron single-atom catalysts (Fe–N4–C) for the oxygen reduction reaction (ORR) remains challenging due to the symmetric electronic structure of atomically dispersed Fe–N4 sites and sluggish kinetics. To address this issue, we introduce Cu–Nx sites and graphene-encapsulated core–shell Fe–Cu nanoalloy (FeCu@G) particles into the Fe–Nx site surroundings through the self-assembly and pyrolysis of a metal–organic framework (MOF). This strategy leverages synergistic interactions with the associated species to modify the uniform electronic structure of Fe single-atom sites, thereby enhancing oxygen-adsorption/desorption kinetics. Density functional theory (DFT) calculations reveal that the incorporation of Cu–Nx sites and FeCu@G nanoalloy particles significantly alters the electronic structure of Fe–Nx sites, leading to improved ORR activity. Consequently, the optimized FeCu-DSAs@CNT, comprising dual single-atom sites (DSAs: Fe–Nx and Cu–Nx) and FeCu@G nanoalloy within MOF-derived nitrogen-doped carbon nanotubes (CNTs), exhibits a significantly improved half-wave potential (E1/2 = 0.91 V) and feasible ORR kinetics (Tafel slope = 48.15 mV dec−1), surpassing the Pt/C benchmark (E1/2 = 0.847 V and Tafel slope = 56.76 mV dec−1). Notably, FeCu-DSAs@CNT shows a 58 mV more positive E1/2 compared to monometallic Fe–SAs@CNT, attributed to synergistic interactions with Cu species. Moreover, it demonstrates excellent power density, specific capacity, and cycling stability in a lab-made zinc–air battery, outpacing the Pt/C-battery. This study addresses gaps in understanding Fe–Nx site interactions with associated species, providing valuable insights for the advancement of Fe–Nx–C electrocatalysts.
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ENERGY
·
2025
·
IF 9.4
Da Cui,Peng Zhang,Shuang Wu,Hon Man Luk,Yixi Wu,Bin Liu,Shuo Pan,Jingru Bai,Qing Wang,Xuehua Zhang
Oil shale has garnered significant attention as a supplementary energy source to traditional fossil fuels. In this study, we investigated the catalytic hydrothermal liquefaction (HTL) of shale oil sludge using three catalysts (Fe, Na 2 CO 3 , Ni/Al 2 O 3 ) and three combinations in pairs. The hydrothermal oil (HTO) yield, energy recovery (ER), and conversion rate (CR) of organic matters were comprehensively analyzed under six catalyst conditions. Both Fe + Na 2 CO 3 and Fe + Ni/Al 2 O 3 paired catalyst combinations achieved similar HTO yields of 28.43 % and 28.13 % along with ER values of 56.19 % and 57.94 % respectively. Moreover, these two groups achieved remarkably high CR values of 81.88 % and 81.02 %, respectively. The HTO from the Fe + Ni/Al 2 O 3 combination has the highest H/C ratio and the lowest O/C ratio at 1.682 and 0.032, respectively. Elemental composition, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography-mass spectrometry (GC-MS) analyses of HTO were conducted in this study. The HTO produced by using Fe + Ni/Al 2 O 3 exhibited the most ideal distillation distribution, with fractions below diesel accounting for up to 96.94 %. Based on the catalytic functions of Fe, Ni, and Al 2 O 3 , six potential synergistic mechanisms of Fe + Ni/Al 2 O 3 were summarized. These mechanisms highlighted Fe + Ni/Al 2 O 3 's roles in promoting compound conversion pathways in HTO, ultimately revealing the synergistic catalytic mechanism.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Bin Zheng,Long Zhou,Chengjie Xue,Kuang Wang,Zhanqiang Fang
Oxalic acid-modified ball-milled zero-valent iron (OA-ZVI bm ) was employed to activate sodium chlorite (ClO 2 - ) for the removal of norfloxacin (NOR). The complete removal of 20 mg/L NOR was achieved within 60 min by the OA-ZVI bm /ClO 2 - process. Compared with the ZVI bm /ClO 2 - process which was the ball-milled zero-valent iron (ZVI bm ) activate sodium chlorite, the reaction activity of the OA-ZVI bm /ClO 2 - process was increased by 102.6 times. Through scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical testing, and density functional theory (DFT) calculations, which has been confirmed that the introduction of oxalic acid can significantly increase the surface Fe(II) content of OA-ZVI bm , and accelerate the electron transfer rate of iron nuclei, thereby improve the efficiency of ClO 2 - activation for the removal of NOR. The role of various active species in NOR removal, which were •O 2 - , 1 O 2 , Fe(IV), ClO 2 , and •OH, was elucidated through free radical quenching experiments, electron paramagnetic resonance (EPR) spectroscopy, and quantitative detection of active species. These active species all participated in the reaction, while •O 2 - played a dominant role in the reaction because it could transform into other active species, such as (•OH, 1 O 2 ). Inorganic anions and natural organic matter have no significant effect on the removal of NOR in the OA-ZVI bm /ClO 2 - process. The protonation of oxalic acid ensured its good pH applicability range (pH = 2–11), thus exhibiting excellent performance in NOR removal in real water bodies. This further demonstrates that OA-ZVI bm prepared by oxalic acid ball milling modification is an efficient ClO 2 - activator, offering promising prospects for antibiotic removal technology.
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PubMed
高影响因子
ACTA MATERIALIA
·
2024
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IF 8.3
Kun Wei,Jianhong Duan,Gaosheng Li,Huifen Yu,He Qi,Hao Li
Multi-phase NaNbO 3 (NN) exhibits high adjustability on the ordering of both polarization and oxygen octahedral tilt, becoming a perfect carrier to design heterogeneous structure for boosting comprehensive energy storage properties. To balance the energy storage density and efficiency, the coexistence of the relaxor antiferroelectric (AFE) with high polarization capability and the relaxor ferroelectrics (RFE) with high efficiency is designed in this work by introducing Sr 0.7 Bi 0.2 □ 0.1 Ti 0.75 Ta 0.2 □ 0.05 O 3 (SBTT) into NaNbO 3 -BiFeO 3 . As a result, an outstanding capacitive energy density ( W rec ) of 12.25 J cm −3 with a high η of 83 % can be achieved in NN-BF-SBTT ceramic, which can be identified as a novel heterogeneous coexisting structure with the crossover of high polarization capability in relaxor AFE and high efficiency in RFE in terms of high-resolution TEM. Furthermore, grain refinement and the dense structure inhibit the leak current, suppress the concentration of oxygen vacancy defects and raise the activation energy ( E a ), thus enhancing the E B . These excellent energy storage properties overcome the trade-offs between the two sets of parameters ( W rec - η , Δ P - E B ), offering a refreshing strategy for the development of high-performance ceramic capacitors.
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Water
·
2024
·Vol. 16
·期 24
·3658
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IF 3
Jialin Chen,Yi Xie,Jun Xia,Xiaolin Zhang,Dong Chen
An advanced photochemical reduction system involving the UV/Fe(III)–oxalate system was developed for the reduction of nitrate (NO3−) to harmless N-gaseous species, primarily nitrogen (N2), by carbon dioxide radical (·CO2−) generated in the presence of dissolved oxygen (DO). Electron paramagnetic resonance (EPR) analyses confirmed the presence of both ·CO2−and ·OH radicals. Systematic investigations were conducted on various operational parameters, such as the initial Fe(III) concentration, oxalate concentration, and pH levels, to assess their impacts on the efficiency and products of NO3−reduction. Notably, solution pH played a significant role in influencing the NO3−reduction efficiency and the final products. At pH 2, approximately 75% of NO3−was converted into N2with an 80% selectivity. In the pH range of 3 to 5, a remarkable NO3−removal rate of about 90% was achieved. Furthermore, higher concentrations of Fe(III) (2 mM) and oxalate (10 mM) were found to enhance NO3−removal to 91.95% and 88.71%, respectively. The presence of DO increased the oxidative potential in the reaction system, subsequently enhancing the selectivity conversion of NO3−to N2. In summary, the UV/Fe(III)–oxalate system exhibits significant potential for effective removal of NO3−while achieving high selectivity for the production of N2in water remediation applications.
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CARBON
·
2025
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IF 11.6
Bowen Yang,Longhui Zheng,Zhiwen Cheng,Maohong Fan,Jiming Hao,Qiang Ma
Phenol-polluted water poses significant risks, inflicting serious harm on both aquatic and terrestrial organisms. While Fenton and Fenton-like processes have been widely employed in wastewater treatment, their effectiveness is hindered by a major limitation: the sluggish cycle of Fe(III)/Fe(II). This slow cycle has become the Achilles' Heel of these methods, preventing their broader application. In this study, graphene oxide (GO) was introduced to facilitate the generation of Fe(II) from Fe(III), enhancing peroxydisulfate (PDS) activation for pollutant degradation. The Fe(III)/GO/PDS system demonstrated effective pollutant degradation capability with 100 % treatment efficiency (phenol = 10 mg L −1 , GO = 50 mg L −1 , Fe(III) = 0.2 mM, PDS = 1 mM, and initial pH of 3). The radical-mediated oxidation mechanism was proposed based on radical scavenger effects, oxidation products, and electron paramagnetic resonance spectra. The conversion of methyl phenyl sulfoxide (PMSO) to methyl phenyl sulfone (PMSO 2 ) indicated the formation of Fe(IV) in Fe(III)/GO/PDS system. To reveal degradation rules for multiple substrates, eighteen molecular descriptors were calculated using density functional theory (DFT) and correlated them with degradation rate constants ( k ). BO n , E B3LYP , and F (−) x emerged as significant parameters in this relationship. The Fe(III)/GO/PDS system demonstrated excellent reusability during the first five runs, effectively treating contaminants. However, its performance was hindered by kinetic retardation when certain anions, such as phosphate and bicarbonate, were present. These findings contribute to both scientific understanding and technical development of persulfate activation via the Fe(III)/Fe(II) cycle using carbonaceous materials, particularly for environmental remediation applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 25
·11319-11332
·
IF 3.5
Wang Yutong,Liang Xiao,Lv Yiyiwu,Li Xiao,Xia Qinghai,Yang Dezhi,Yang Yaling
This study synthesized Fe-doped dopamine carbon dots (Fe-DACDs) as a reducing agent and template hybrid Au and Pt nanoparticles (Au@Pt/Fe-DACDs). Au@Pt/Fe-DACDs with core–shell structures show strong peroxidase (POD)-like activity at physiological pH. A colorimetric and surface-enhanced Raman scattering (SERS) dual-mode detection system for glucose in human serum was constructed by combining Au@Pt/Fe-DACDs with natural glucose oxidase (GOx). The cascade catalysis reactions convert glucose into hydrogen peroxide (H 2 O 2 ), and then, the Au@Pt/Fe-DACDs as both POD-like nanozyme and Raman-enhancers oxidize colorless and weak Raman-active 3,3′,5,5′-tetramethylbenzidine (TMB) into blue and strong Raman-active ox-TMB. The linear response ranges of glucose are from 0.02 to 1 mM, with a detection limit of 2.3 μM for colorimetric detection and 0.01 mM to 0.7 mM with a detection limit of 1.4 μM for SERS sensors. Glucose content in human serum samples was successfully assayed with a good recovery from 97.6 to 105.3%. Overall, these results demonstrate a new way of designing biological detection systems based on SERS and colorimetric dual-mode sensing.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Shuo Qin,Zongze Li,Boran Zhou,Bin Liu,Yuting Xue,Ruixue Zhao,Lirong Zheng,Zhengbo Chen,Xia Zuo
Overuse of benzoate as a preservative is bad for human health. Therefore, we need to achieve quantitative detection of benzoate. Colorimetric nanozyme sensors have garnered significant interest owing to their exceptional efficacy and affordability. In this article, Fe-N-C dodecahedral nanozymes with superior peroxidase-like catalytic activity are prepared using ZIF-8 as a precursor. Therefore, we construct a colorimetric sensor for benzoate detection with a detection limit of 0.33 μM through integrating the inhibitory impact of benzoate on D-amino acid oxidase activity with the Fe-N-C-catalyzed 3,3′,5,5′-tetramethylbenzidine (TMB)–H 2 O 2 system, and this reaction is completed within 10 min. It is noteworthy that a recovery rate of 96.8–109 % has been attained for the detection of benzoate in beverages.
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危险品化学品经营许可证（带存储）