JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Longjiang Jiang,Kaikai Ba,Yanhong Lin,Dejun Wang,Meng Cui,Tengfeng Xie
The extensive solid-liquid interface between the photoanode and the electrolyte solution impedes the kinetics of the oxygen evolution reaction (OER), resulting in a photoelectrochemical (PEC) water splitting efficiency that falls short of theoretical predictions. In this study, by depositing a metal-phytate complex (CoCu-PA) coating onto Ti, Zr co-doped Fe 2 O 3 via a hydrothermal method, we successfully fabricated a CoCu-PA/Ti,Zr:Fe 2 O 3 composite photoanode for water oxidation. Various characterization techniques and electrochemical analyses indicated that Ti, Zr co-doping enhanced the conductivity of Fe 2 O 3 . More importantly, owing to the highly hydrophilic property of CoCu-PA, the charge transfer resistance at the interface between the composite photoanode and the solution is significantly reduced. Furthermore, a built-in electric field was formed within the photoanode, facilitating the rapid migration of photogenerated charges and their efficient injection into the electrolyte to participate in the OER. As a result, the CoCu-PA coating enhanced the OER kinetics of the composite photoanode and led to a photocurrent density of 3.4 mA/cm 2 . This study offers new insights into the design of composite photoanodes to improve charge migration efficiency both within the bulk material and at the solid-liquid interface.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Chengyu Zhang,Zhisheng Yu,Xiangyang Wang,Bobo Wang
In this study, a novel γ-Fe 2 O 3 /biochar (BF γ ) composite by a plant in-situ enrichment and one-step pyrolysis strategy was prepared, which was applied as a photocatalyst to activate peroxymonosulfate (PMS) for the degradation of p-chlorophenol (4-CP) under visible light irradiation (BF γ /PMS/Vis) system. The characterization results exhibited that γ-Fe 2 O 3 with localized carbon doping was evenly embedded in biochar during the pyrolysis. BF γ exhibited better photoresponse properties than biochar (BC) and γ-Fe 2 O 3 . The removal efficiency of this system for 4-CP reached 96.41% under optimal conditions. This system showed high removal efficiency with a wide pH range (3.0–13.0) and under conditions of different organic pollutants . It also showed strong resistance to interference with co-existing inorganic ions and humic acid (HA). Electron paramagnetic resonance (EPR) and radical scavenging experiments revealed that the reactive oxygen species (ROS) in this system included SO 4 - ·, ·OH, ·O 2 - and 1 O 2 . The density functional theoretical (DFT) calculations further revealed the promotion of localized carbon doping in γ-Fe 2 O 3 on electron transfer and photoresponse, including C-O bond (d=1.29 Å), C-Fe bond (d=1.80 Å) and band gap value (E gap < 0.72 eV). This study provides new insights into constructing environmentally-friendly catalysts and the possibility of the solid waste recycling for other wetland plants.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
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IF 5.2
Yubo Wu,Chu Dai,Yulun Nie,Xike Tian,Chao Yang
Surface Fe 2+ content has become a limiting step of α-Fe 2 O 3 Photo-assisted Fenton catalytic activity, and a high-efficiency process is urgently required to enhance it. Herein, α-Fe 2 O 3 catalysts with three different morphologies (cube, sphere, and leaf-like) were successfully synthesized under hydrothermal conditions and presented quite different Photo-assisted Fenton-like activities for Rhodamine B (RhB) degradation. Unexpectedly, catalysts show certain activity, especially leaf-like α-Fe 2 O 3 ( L -Fe 2 O 3 ) showed the highest RhB catalytic degradation activity. The mechanistic study has found that the morphology will change the surface Fe 2+ content of α-Fe 2 O 3 , which will affect the Fe 2+ /Fe 3+ cycle and the role of surface Fe 2+ in a Photo-assisted Fenton-like system proved by the results of XPS measurements and 2,2-bipyridine (BPY) quenching experiment. In addition, the L -Fe 2 O 3 catalyst represented broad applicability and stability, which is beneficial for the actual industrial application.
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Antibiotics-Basel
·
2022
·Vol. 11
·期 9
·1252
·
IF 5.222
Samar Zuhair Alshawwa,Eman J. Mohammed,Nada Hashim,Mohamed Sharaf,Samy Selim,Hayaa M. Alhuthali,Hind A. Alzahrani,Alsayed E. Mekky,Mohamed G. Elharrif
In the present study, we utilizedStevia rebaudianaL. (SRLe) extract to in situ biosynthesize nanoscale alpha hematite (α-Fe2O3) nanoparticles (NPs) with potent antioxidant, antimicrobial, and anticancer properties. SRLe-α-Fe2O3was characterized using physiochemical analyses, including UV/Vis, FTIR, XRD, DLS, EDX, SEM, and TEM studies. Among tested solvents, CHCl3/MeOH (2:1v/v) SRL extract (least polar solvent) contained the highest EY, TPC, and antioxidant capacity of ~3.5%, ~75 mg GAE/g extract, and IC50= 9.87 ± 0.7 mg/mL, respectively. FTIR confirmed the engagement of coating operation to the colloidal α-Fe2O3NPs. TEM, SEM, and DLS revealed that SRLe-α-Fe2O3has a spherical shape, uniform size distribution with aggregation for an average size of ~18.34 nm, and ζ = −19.4 mV, forming a repulsive barrier that helped to improve stability. The synthesized nanoparticles displayed considerable antibacterial activity againstE. coliandS. aureusbacterial growth, and exhibited superior activity against the A549 lung cancer cell lines. These findings indicate that the increased availability of bioactive substances with antioxidant properties of SRLe makes it a potentially interesting material for the preparation of biologically active compounds and green synthesis of nanoparticles.Keywords:Stevia rebaudianaL.;IONP green synthesis;antioxidant;cytotoxic;antitumor;extraction yield
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rui Dang,Xiang-Rong Ma,Yun-Peng Zhao,Menjiao Ren,Wei Guo,Yu-Hong Kang,Yong Gao,Shiqing Bi,Wenwen Gao,Hua-Rui Hao,Rui Bai,Yu-Fei Wang,LongYan,Liguo Gao,Zhi-Fang Zhang,Ya-Jun Ma,Xian-Yong Wei
The construction of three-dimensional (3D) Ni 2+ -Al 3+ -LDH / γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -layered double hydroxide (LDH) structures (S1–S6) with magnetic properties and different (γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -LDH)/(Ni 2+ -Al 3+ -LDH) ratios were successfully prepared. The effects of these ratios in these 3D LDH constructions on physicochemical properties were investigated using XRD, SEM, VSM, UV–vis, and BET analyses. The specific surface area and band gap of these materials decreased with increased ratio, while the saturation magnetization increased. The synergistic combination of saturation magnetization, adsorption characteristics, and band gap of six sample types were evaluated. S3 samples were used in a multistage recycling treatment study of dye wastewater and fluoride ion (F − )-containing wastewater, effectively degrading methyl orange (MO) due to its high photocatalytic activity. After this, the memory effect of the calcined product (S3, 300 °C) significantly enhanced the migration and diffusion of F − , resulting in a F − adsorption capacity of 49.25 mg/g. The recycling properties of this composite material for photocatalytic degradation and adsorption capabilities for F − removal were evaluated, showing a reduction in efficiency of only 1 % and 8.6 % for degradation of MO and F − removal respectively, with no significant loss of efficiency after 10 cycles. Adsorption experiments and subsequent sample characterization showed that the F − adsorption mechanism of S3 involved ion exchange mechanism and sorption sites (interlayer, basal, edges and junction sites). The existence of oxygen vacancies and formation of S-scheme heterojunction between γ-Fe 2 O 3 -Cd 2+ -Ni 2+ -Fe 3+ -LDH and Ni 2+ -Al 3+ -LDH, resulted in the improvement of the photocatalytic activity. The results obtained in this study demonstrated that Ni 2+ -Al 3+ -LDH/γ-Fe 2 O 3 - Cd 2+ -Ni 2+ -Fe 3+ -LDH composites were a promising adsorbent for degradation of MO and F − removal in practical multilevel utilization due to its simple synthesis, low-cost, recyclability, and high removal capability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Huan Chai,Huilin Niu,Lili Gao,Jun Jin
The onset potential is an important descriptor of the photoelectrochemical water oxidation performance of photoanodes. Herein, we prepared Gd-doped hematite (Gd-Fe 2 O 3 )/iron (III) oxyhydroxide (FeOOH) core-shell photoanodes by in-situ isovalent doping and secondary hydrothermal treatment . This Gd-Fe 2 O 3 /FeOOH photoanode shows a record alkaline water oxidation onset potential (0.59 V vs. reversible hydrogen electrode) in hematite-based photoanodes and a 2.4-fold increase in photocurrent density over pristine hematite . Detailed studies demonstrate that the origin of the ultra-low onset potential is mainly attributed to the synergistic effect of isovalent Gd-doping and FeOOH cocatalyst. Specifically, Gd doping enhances donor density and reduces charge transport resistance, and FeOOH cocatalyst significantly improves water oxidation kinetics. In addition, the strong interfacial coupling of FeOOH and Gd-Fe 2 O 3 promotes electron flow, which also improves the charge separation remarkably. This work gives hope for the achievement of stable and bias-free hematite-based photoanodes.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Yaqiao Liu,Shuozhen Hu,Zhaoqun Gao,Xinsheng Zhang,Shigang Sun
Photoelectrochemical (PEC) water oxidation is considered to be a promising approach to converting solar energy into clean chemical fuels. α-Fe2O3 is a potential photoanode material for water oxidation with a high theoretical photocurrent density (12.6 mA cm–2) driven by visible light. Constructing α-Fe2O3-based heterojunction with other semiconductors is a promising strategy to improve the actual photoelectrocatalytic activity. In this work, nitrogen-doped Ta2O5 is introduced to synthesize N-Ta2O5-h@α-Fe2O3 nanorod heterojunction with different band structures. At the interface, electrons transfer from N-Ta2O5-h to α-Fe2O3, which forms a built-in electric field. The heterojunction structure contributes to inhibiting the severe recombination of photogenerated electron–hole pairs. By controlling the duration of mild heat treatment, the N-Ta2O5-h nanorods with different Fermi energy levels and contents of oxygen vacancies are obtained. A mild heat treatment in N2 is proved to enlarge the ΔE by leveling up the Fermi level and to promote the content of oxygen vacancies for the N-Ta2O5-h@α-Fe2O3 heterojunction as the heat-treatment time increases. The PEC water oxidation performance of the N-Ta2O5-h@α-Fe2O3 heterojunction increases when the mild-heat-treatment time is 2 h and decreases for 6 h treatment. Eventually, N-Ta2O5-2@α-Fe2O3 exhibits an enhanced photocurrent density of 3.10 mA cm–2 (4.4 times higher than that of bare α-Fe2O3), an efficiently boosted charge separation (2.0 times higher than bare α-Fe2O3), and a high chemical stability after a long-term test.
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Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 5
·2764-2774
·
IF 11.301
Yali Wang,Ruihui Gan,Hao Liu,Mahmut Dirican,Chengbiao Wei,Chang Ma,Jingli Shi,Xiangwu Zhang
The advancement of electrocatalysts using non-precious metals with excellent catalytic ability and durability for the oxygen reduction reaction (ORR) remains an enormous challenge. Transition metal–nitrogen–carbon (M–N–C) materials become target products with great development and application prospects for the ORR in new electrochemical energy storage and conversion devices. Herein, a simple preparation procedure of N-doped hierarchically porous carbon nanospheres loaded with Fe3O4/Fe2O3/Fe nanoparticles (Fe–CNSs–N) is developed by direct annealing of an Fe-doped quinone-amine polymer in an NH3/Ar atmosphere. Due to the integration of large specific surface area, hierarchically porous structure, and Fe3O4/Fe2O3/Fe nanoparticles, Fe–CNSs–N presents a half-wave potential of 0.835 V vs. RHE, which is 7 mV more positive than that of a commercial Pt/C catalyst in an alkaline medium. It also exhibits outstanding long-cycle durability as well as methanol endurance, superior to the Pt/C catalyst. Compared to the zinc–air battery based on Pt/C, the Fe–CNSs–N-based battery presents a higher open-circuit potential of 1.54 V, steadier discharge–charge cycle performance and an outstanding maximum power density of 106.8 mW cm−2. The excellent electrocatalytic performances make Fe–CNSs–N a promising substitute for Pt/C noble-metal catalysts in rechargeable Zn–air batteries.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215601
·
IF 3.551
Dongming Zhang,Mingpeng Chen,Haiyuan Zou,Yumin Zhang,Jicu Hu,Huapeng Wang,Baoye Zi,Jin Zhang,Zhongqi Zhu,Lele Duan,Qingju Liu
To address the urgent issues of hazardous gas detection and the prevention of environmental pollution, various functional materials for gas sensing and catalytic reduction have been studied. Specifically, the p-type perovskite LaFeO3 has been studied widely because of its promising physicochemical properties. However, there remains several problems to develop a controllable synthesis of LaFeO3-based p-n heterojunctions. In this work, α-Fe2O3 was further compounded with LaFeO3 to form a porous and hollow α-Fe2O3/LaFeO3 heterojunction to improve its gas-sensing performance and photocatalytic efficiency via a microwave-assisted hydrothermal method. While evaluated as sensors of acetone gas, the optimized sample exhibits excellent performance, including a high response (48.3), excellent selectivity, good reversibility, fast response, and recovery ability. Furthermore, it is an efficient catalyst for the degradation of methylene blue. This can be attributed to the enhancement effect of its larger specific surface area, fast diffusion, enhanced surface activities, and p-n heterojunction. Additionally, this work provides a rapid and rational synthesis strategy to produce metal oxides with both enhanced gas-sensing performance and improved photocatalytic properties.
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Frontiers of Environmental Science & Engineering
·
2020
·Vol. 14
·期 2
·1-11
·
IF 4.053
Guo Xingguo,Wang Qiuying,Xu Ting,Wei Kajia,Yin Mengxi,Liang Peng,Huang Xia,Zhang Xiaoyuan
Developing high activity, low-cost and long durability catalysts for oxygen reduction reaction is of great significance for the practical application of microbial fuel cells. The full exposure of active sites in catalysts can enhance catalytic activity dramatically. Here, novel Fe-N-doped graphene is successfully synthesized via a one-step in situ ball milling method. Pristine graphite, ball milling graphene, N-doped graphene and Fe-N-doped graphene are applied in air cathodes, and enhanced performance is observed in microbial fuel cells with graphene-based catalysts. Particularly, Fe-N-doped graphene achieves the highest oxygen reduction reaction activity, with a maximum power density of 1380±20 mW/m 2 in microbial fuel cells and a current density of 23.8 A/m 2 at −0.16 V in electrochemical tests, which are comparable to commercial Pt and 390% and 640% of those of pristine graphite. An investigation of the material characteristics reveals that the superior performance of Fe-N-doped graphene results from the full exposure of Fe 2 O 3 nanoparticles, pyrrolic N, pyridinic N and excellent Fe-N-G active sites on the graphene matrix. This work not only suggests the strategy of maximally exposing active sites to optimize the potential of catalysts but also provides promising catalysts for the use of microbial fuel cells in sustainable energy generation.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Hongjie Zhu,Lingxuan Gong,Zhengkui Li
There is a great need to design a new method for fabricating efficient and cheap Z-scheme photocatalysts. For this reason, we synthesized a novel Z-scheme photocatalyst α-Fe 2 O 3 /P3HT with O-Ti-O charge transfer mediator. The effective compounding of each part was confirmed by different characterization methods. The charge transfer mechanism was confirmed to obey the Z-scheme mechanism by measuring the valence band value and by ESR experiments. Moreover, the Z-scheme mechanism in this system was further discussed based on the observed changes in the chemical structure and the theoretical calculation. Based on the characterization of the optical properties, this novel catalyst exhibited better charge transfer and separation abilities under visible light conditions due to its unique architecture. Additionally, this novel Z-scheme photocatalyst showed enhancement in the bisphenol A degradation effect, the degradation reaction was pseudo-first-order kinetics, a removal rate of up to 90% was maintained after four cycles. The BPA degradation pathway was also discussed in this study. This study provides a new approach for the construction of Z-scheme photocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zigui Luo,Xi’an Fan,Wentao Hu,Fan Luo,Jian Wang,Zhaoyang Wu,Xin Liu,Guangqiang Li,Yawei Li
In this work, Fe–Si/Fe 2 SiO 4 soft magnetic composites (SMCs) are prepared successfully via sintering Fe-6.5 wt%Si/α-Fe 2 O 3 core-shell composite powders obtained by ball milling. The transformation mechanism from Fe-6.5 wt%Si/α-Fe 2 O 3 to Fe–Si/Fe 2 SiO 4 is revealed in detail. The effect of α-Fe 2 O 3 coating content on microstructure and magnetic properties for the Fe–Si/Fe 2 SiO 4 SMCs is also investigated. During the high temperature sintering process, α-Fe 2 O 3 coating will in situ react with diffused Si from Fe–Si alloy cores, and result in the generation of Fe 2 SiO 4 insulating layer and Fe atoms. When the α-Fe 2 O 3 coating content increases from 0.0 wt% to 7.5 wt%, the insulating layer becomes thicker. Nevertheless, with further increasing the α-Fe 2 O 3 coating content from 7.5 wt% to 12.5 wt%, the generation of excessive Fe breaks the continuity of the insulation layer. As a result, the saturation magnetization decreases gradually, while the coercivity exhibits an opposite trend. The core loss decreases firstly and then increases. Therefore, the Fe–Si/Fe 2 SiO 4 SMCs coated with 7.5 wt% α-Fe 2 O 3 exhibit superior comprehensive performance such as very low core loss (39.6 mW/cm 3 at 50 kHz), very high saturation magnetization (191.4 emu/g) and stable permeability (44) from 50 Hz to 200 kHz.
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