MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Nan Qing Yang,Jin Li,Ya Nan Wang,Jie Ma
In this study, Fe and Ce co-doped ZnO (Zn 1-2x Fe x Ce x O, x = 0, 0.01, 0.03, 0.04) was prepared through hydrothermal synthesis , followed by annealing. The samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, UV–vis spectroscopy, and photoluminescence spectroscopy, and the photocatalytic efficiency of the samples on the organic dye, methylene blue, under simulated sunlight was studied. Based on first principles, the influence of doping on the band structure of the samples was studied. The experimental results show that co-doping ratios affect the performance of ZnO. When the doping concentration was 3 at%, the red shift of the UV–vis spectrum of the material was the most obvious, and the PL of the material was inhibited. Compared with pure ZnO, the degradation rate increased from 72.6% to 98.5%. As the doping concentration increased, the photocatalytic performance of the materials began to decrease. Simulations showed that the incorporation of small amounts of Fe and Ce reduced the band gap of ZnO and introduced a shallow donor level in the band gap, effectively inhibiting the recombination of carriers, thereby improving the photocatalytic performance of the material. When the doping ratio was increased from 3% to 4%, the band gap became wider. These results indicate that Fe and Ce co-doped ZnO has potential applications in the photocatalytic degradation of organic pollutants and provides a method for improving photocatalytic performance by inhibiting carrier recombination.
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FUEL PROCESSING TECHNOLOGY
·
2023
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IF 7.5
Liujie Xu,Yi Li,Mingzheng Liao,Qingbin Song,Chao Wang,Jiahong Weng,Ming Zhao,Ningbo Gao
Waste cooking oil (WCO) energy development offers an effective method for producing renewable fuels , enabling simultaneous resource recovery and pollution reduction. This study aims to develop a novel bimetallic Fe(Ni)-Ru/ZSM-5 catalyst toward H 2 -rich syngas production from WCO. The results show that Fe-Ru/ZSM-5 produced a higher maximum H 2 yield (84.05 μmol·g cat. −1 ·s −1 ) than did Ni-Ru/ZSM-5 (41.76 μmol·g cat. −1 ·s −1 ) when fed at a 50 L/min rate at an optimal temperature of 700 °C. Fe-Ru/ZSM-5 presented a more prolific microporous distribution, whose structure contributes to the diffusion of the short-chain hydrocarbon intermediate reactants to enhance hydrogen production . Fe(III) can help to improve the conversion ratio of benzene and the anti‑carbon deposition capability of the catalyst. The dealumination and oxidation decreases the stability of the catalyst and may lead to inactivation. Furthermore, this study discusses the mechanism of bimetallic-loaded catalysts combining noble metals with transition metals in WCO pyrolysis . The results point to effective new approaches to increase H 2 production through the catalytic pyrolysis of WCO.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 46
·17265-17274
·
IF 4.39
Yun-Wu Li,Shi-Kun Su,Cai-Zhen Yue,Jun Shu,Peng-Fang Zhang,Fang-Hui Du,Su-Na Wang,Hui-Yan Ma,Jie Yin,Xin Shao
Electrochemical water splitting is convinced as one of the most promising solutions to combat the energy crisis. The exploitation of efficient hydrogen and oxygen evolution reaction (HER/OER) bifunctional electrocatalysts is undoubtedly a vital spark yet challenging for imperative green sustainable energy. Herein, through introducing a simple pH regulated redox reaction into a tractable hydrothermal procedure, a hierarchical Fe3O4@MnOx binary metal oxide core–shell nano-polyhedron was designed by evolving MnOx wrapped Fe3O4. The MnOx effectively prevents the agglomeration and surface oxidation of Fe3O4 nano-particles and increases the electrochemically active sites. Benefiting from the generous active sites and synergistic effects of Fe3O4 and MnOx, the Fe3O4@MnOx-NF nanocomposite implements efficient HER/OER bifunctional electrocatalytic performance and overall water splitting. As a result, hierarchical Fe3O4@MnOx only requires a low HER/OER overpotential of 242/188 mV to deliver 10 mA cm−2, a small Tafel slope of 116.4/77.6 mV dec−1, combining a long-term cyclability of 5 h. Impressively, by applying Fe3O4@MnOx as an independent cathode and anode, the overall water splitting cell supplies a competitive voltage of 1.64 V to achieve 10 mA cm−2 and super long cyclability of 80 h. These results reveal that this material is a promising candidate for practical water electrolysis application.
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高影响因子
BIOMATERIALS
·
2013
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IF 7.604
Shuai Xu,Jing Liu,Dian Li,Liming Wang,Jia Guo,Changchun Wang,Chunying Chen
We propose a modular synthetic strategy to constitute metallosalphen prodrugs in the form of coordination polymer nanoparticles , comprising magnetite nanocrystal colloidal cluster as core and salphen-In III coordination polymer as shell. These composite nanoparticles are not only equipped with intense photoluminescence , sensitive magnetic responsiveness and pH-dependent degradability, but also serve as prodrugs to accomplish intercellular conversion from non-toxic nanoparticles (Fe 3 O 4 @Salphen-In III ) to pharmacologically active complexes (Fe–salphen), allowing to specifically inhibit the proliferation of A549 cancer cells via caspase activation.
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高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 35
·13260-13272
·
IF 4.052
Shaojia Song,Kun Wu,Huadong Wu,Jia Guo,Linfeng Zhang
A series of multi-shelled Fe3+/Sn4+-doped ZnO microspheres were synthesized by calcining carbon microspheres as sacrificial templates. The crystal structure, morphology and optical properties of prepared photocatalysts were investigated by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Scanning Transmission Electron Microscopy (STEM), X-ray Photoelectron Spectroscopy (XPS), UV-Vis absorption spectroscopy (UV-Vis DRS), Photoluminescence (PL) spectroscopy and transient photocurrent techniques. FESEM and STEM images demonstrated that the samples had a multi-shelled structure and the doping elements were uniformly dispersed in the ZnO matrix. DRS and PL spectra and photocurrent measurements show that the Fe/Sn doped-ZnO samples exhibited higher visible absorption and lower recombination rates of photogenerated electron–hole (e−/h+) pairs. These advantages resulted in higher photodegradation efficiency of these catalysts towards methylene blue (MB) and ciprofloxacin (CIP). Moreover, the band structure and density of states of the un-doped ZnO and Fe/Sn-doped ZnO models with three different doping ratios were calculated based on the CASTEP code. The roles of the Fe3+/Sn4+ dopant in the ZnO matrix were found to be band gap control and electron density adjustment due to the Fe(3d) and Sn(5s, 5p) orbitals. This work has a certain reference value for constructing multi-shelled photocatalysts with doping modification and investigating the mechanism of enhanced photoactivity at the microscopic level.
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高影响因子
Environmental Technology & Innovation
·
2022
·
IF 7.758
Zhen Jiao,Zhijia Miao,Heluan An,Qing Li,Xiangyuan Meng
Water eutrophication caused by phosphate emissions has become a serious environmental issue. In this study, we used the solvothermal method to prepare a novel Ce-doped MIL-100(Fe). Scanning electron microscope observations suggest that Ce-doped MIL-100(Fe) consisted of irregular polyhedrons in the size range of tens of micrometers. Spectroscopy results show that cerium atoms (Ce) were successfully doped into the MIL-100(Fe) frameworks. The specific surface area and pore size of the Ce-doped MIL-100(Fe) were 2.6 m 2 /g and 3.4 nm, respectively. Adsorptive kinetics indicated that the pseudo-second-order model with a high correlation coefficient of ( R 2 : 0.9950) fitted better than the pseudo first-order model with R 2 of 0.9436. The adsorptive isotherms showed that for these adsorption reactions, the Langmuir model matched much better than the Freundlich model for this adsorption. These facts suggest that adsorption is chemical sorption, which occurred on a homogeneous surface. The adsorption capacity of the Ce-doped MIL-100(Fe) was as high as 12.03 mg/g. The adsorption capacity of the Ce-doped MIL-100(Fe) depended strongly on the solution pH, ionic strength, and the coexisted ions. The study also found that the precipitation reaction and complexation interaction might be dominated in the adsorption. This study may contribute to the design of bimetal organic frameworks, and might add new insights into the removal of phosphate.
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CHEMOSPHERE
·
2021
·
IF 7.086
Jiajie Xu,Shengye Wang,Changyu Yan,Hafiz Mohammad Adeel Sharif,Bo Yang
Advanced oxidation processes based on sulfate radicals are considered as a promising approach for environmental remediation. In this study, TiO 2 @MIL-101(Fe) is successfully fabricated by a facile impregnation method and is used for sodium persulfate (SPS) activation. TiO 2 @MIL-101@SPS combines the advantages of photocatalysis and SPS activation, which shows high removal efficiency for nitrobenzene and methyl orange. In addition, the effect of multiple factors, including light source, SPS amount and catalyst amount, on nitrobenzene degradation have been investigated. Results show that the nitrobenzene degradation efficiency is up to 66.53 % while that of TOC removal is 32.21 % under 4-h visible light irradiation with 30 mg catalyst and 1.6 mM SPS. Moreover, LC-MS have been carried out to study the route of nitrobenzene degradation. Besides, ESR analysis reveals that both ● SO 4 − and ● OH radicals are generated sustainably under visible light irradiation, and more ● OH radicals can be detected owing to the synergic effect of photocatalysis and SPS activation. Interfacial charge transfer effect provides photoinduced electrons for the Fe 3+ /Fe 2+ cycle in MIL-101(Fe), which boosts the SPS activation process, resulting in high photocatalytic activity.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yupeng Wang,Xiangyuan Yu,Shulong Wen,Yihu Sun,Huibin Wei
The effective and economical removal of heavy metal-organic complexes remain an urgent challenge in the field of industrial wastewater treatment. In this study, Ca-doped ferrihydrite composites and Ca/Al co-doped ferrihydrite composites were synthesized via a simple one-step co-precipitation method and applied for the oxidative removal of EDTA-Cu in a hypochlorite system. The incorporation of Al significantly enhanced the material's stability. The Fe-Ca-Al composite exhibited a catalytic degradation efficiency of 97 % after 4 reaction cycles, representing a 32 % improvement compared to the Ca-doped ferrihydrite (Fe-Ca). Mechanistic studies revealed that the Fe-Ca-Al composite demonstrated strong selective adsorption of the organic moieties in EDTA-Cu over a broad pH range. Moreover, the oxygen vacancies (Ov) induced by Ca and Al co-doping played a crucial role in the enhanced catalytic performance and efficient removal of EDTA-Cu. These abundant Ov promoted electron transfer and provided numerous surface adsorption sites, facilitating the conversion of O 2 · - to 1 O 2 . Given that 1 O 2 can rapidly degrade organic compounds containing amino and carboxyl groups, it shows excellent potential for the treatment of EDTA-Cu. This study presents a highly active and reusable catalyst based on a Ca-Al doping strategy, offering a promising approach for the removal of organic-heavy metal complexes.
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高影响因子
Chemical Engineering Journal Advances
·
2025
·
IF 7.1
Xiaoyu Fang,Shucai Zhang,Yan Xie,Meng Yao,Diannan Lu,Yakui Chen
The widespread use of methyl tert-butyl ether (MTBE) in gasoline has led to persistent groundwater contamination. Recently, permeable reactive barriers (PRBs) have emerged as a key in situ remediation technology for treating with such contamination. Various reactive media have been employed to intercept and degrade pollutants, but their short half-lives, instability, and poor dispersion in heterogeneous geological conditions limit their effectiveness and further applications. In this study, we designed a double-column PRB system incorporating slow-release oxidants (PLA@CP-CA) and Fe-based zeolite as heterogeneous Fenton catalysts. Calcium peroxide (CaO₂) was selected as the oxidant instead of hydrogen peroxide (H₂O₂) due to its higher stability, ease of transport, and prolonged release, facilitating sustained pollutant degradation. However, the direct use of CaO₂ raises groundwater pH, so citric acid (CA) was employed as a buffer to regulate pH during CaO₂ dissolution, thereby enhancing the efficiency of the heterogeneous Fenton process. Electron paramagnetic resonance (EPR) spectroscopy and radical trapping experiments confirmed that multiple reactive species, including ·OH, O 2 – ·, and ¹O₂, contributed synergistically to MTBE degradation. To mitigate calcium peroxide leakage, polylactic acid (PLA) was used to encapsulate the oxidant (PLA@CP-CA) under anhydrous conditions. The Box–Behnken design (BBD) in response surface methodology (RSM) optimized the PLA@CP-CA formulation, achieving an optimal H₂O₂ release capacity of 3.22 mmol/g with a mass ratio of PLA/CP/CA at 0.67:1.77:1.17. Approximately 97% of MTBE was remediated within 192 hours using the double-column PRB, demonstrating the efficacy of the controlled oxidant release from PLA@CP-CA in promoting MTBE degradation. This heterogeneous Fenton system, combining PLA@CP-CA with Fe-S-1, offers a promising approach for in situ remediation in MTBE-contaminated environments.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120546
·
IF 7.2
JinCheng Dai,Shuyue He,Xiyu Song,Hongjuan Zhang,Ruyi Xie
The construction of heterojunction photo-Fenton catalysts to activate hydrogen peroxide for the efficient degradation of organic pollutants in water has attracted considerable attention. Herein, a CuBi 2 O 4 @MIL-53(Fe) Z-scheme heterojunction catalyst was successfully prepared by solvothermal method for tetracycline (TC) degradation. In this catalytic system, the heterogeneous photocatalytic reaction and the Fenton reaction form a strong synergistic effect in the degradation of organic pollutants through the transfer of photogenerated electrons. The results indicate that in the presence of trace concentrations of H 2 O 2 (2.60 mM), 0.20 g/L of MC-15 (with CuBi 2 O 4 accounting for 15 % of the mass of MIL-53(Fe)) exhibited the highest catalytic activity, with a TC (150 mg/L) removal rate of 94.0 % after 50 min of visible light irradiation. Interestingly, the MC-15 catalyst can still achieve a removal rate of 62.1 % of TC even under dark conditions. Furthermore, in degradation experiments, MC-15 exhibited high environmental stability and applicability in different natural water system. The excellent catalytic performance of the light/MC-15/H 2 O 2 system is attributed to the quick separation of photogenerated electron-hole pairs from Z-scheme heterojunction CuBi 2 O 4 @MIL-53(Fe) and the accelerated bimetallic ions cycle. A possible photo-Fenton catalytic mechanism of MC-15 catalyst is proposed based photoelectrochemical tests, free radical capture experiment and electron paramagnetic resonance (EPR) analysis. This study provides a reference for the development of iron-based metal-organic framework composite photo-Fenton catalysts.
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Environmental Technology & Innovation
·
2025
·
IF 7.1
Jun Dong,Yuanjun Tang,Jiayin Ma,Peikun Jiang,Yinxiu Liu,Ruohui Lu,Yin Li,Shuqi Li,Yangqing Hu,Fei Wang
The widespread use of antibiotics has led to their accumulation in water, posing serious environmental risks. Biochar has emerged as a promising adsorbent for antibiotic removal, but its performance is often limited by low capacity and slow kinetics, especially for high-molecular-weight antibiotics. In this study, a hierarchical porous Fe-supported biochar (HPFeBC) was synthesized via one-step pyrolysis of pine sawdust using Fe(NO 3 ) 3 as both activator and template. The obtained HPFeBC exhibited a well-interconnected pore structure with a high surface area (417.23 m 2 /g) and enhanced mesoporosity, significantly improving mass transfer and accessibility of adsorption sites. HPFeBC demonstrated exceptional adsorption performance for both low-molecular-weight antibiotic tetracycline (TC) and high-molecular-weight antibiotic tylosin (TYL), with maximum capacities of 361.23 mg/g and 173.61 mg/g, respectively. Notably, HPFeBC achieved rapid adsorption equilibrium within 5 mins for TC and 30 mins for TYL, far surpassing commercial adsorbents. The adsorption process followed the pseudo-second-order kinetics and the Freundlich isotherm model, and thermodynamic analysis confirmed the spontaneous and endothermic nature of adsorption. The adsorption mechanism involved pore filling, π-π interactions, hydrogen bonding, surface complexation, and limited redox reaction. HPFeBC also exhibited excellent stability over a wide pH range, strong anti-interference ability, and good reusability. Overall, the synthesis HPFeBC can act as an effective candidate for rapid and efficient removal of antibiotics from water.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Dehao Kong,Yong Wang,Jiayin Han,Yuan Gao,Fengrong Liu,Weirong Zhou,Yubing Gao,Geyu Lu
Triethylamine monitoring plays a vital role in industrial safety and marine environmental protection. Co 3 O 4 has been proved to be a promising sensitive material for triethylamine detection. Promoting gas reactions on the surface of sensitive materials is the key to realizing high-performance gas sensors. In this work, MgO microrods were used as sacrificial templates to prepare nanosheet-assembled hollow microtubular Co-Fe bimetallic oxides. The large specific surface area, small crystallite size, and stretched lattice of Co-Fe bimetallic oxides boosted surface gas reactions and improved the response to triethylamine vapor. The modulation in the energy band structure caused by doping-occupied sites of iron on the gas-sensing properties was also considered. The preferential occupation of tetrahedral sites by multivalent iron reduced the work function and band gap of the material, thus enhancing the formation of ion-adsorbed oxygen. In these cases, the sample with about 20 % iron content (CF2) showed the optimum triethylamine sensing performance at 195 °C, with a detection limit as low as 1 ppm, a gas response of 10.9 for 100 ppm triethylamine, and a 58 % shorter recovery time. In addition, it also exhibited excellent selectivity and repeatability. The gas adsorption model was additionally used to analyze the response and recovery process from an energy perspective. This work contributes insights into the sensitivity enhancement and response-recovery process modulation of spinel oxide gas sensors, mainly in terms of crystal structure and doping sites.
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