APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Jun Li,Zhenduo Cui,Yufeng Zheng,Xiangmei Liu,Zhaoyang Li,Hui Jiang,Shengli Zhu,Yu Zhang,Paul K. Chu,Shuilin Wu
In this work, an atomic-layer Fe 2 O 3 -modified two-dimensional (2D) porphyrinic metal-organic framework (MOF) was prepared (2D MOF-Fe 2 O 3 ), which exhibits unique interfacial electron-withdrawing effect via charge transfer pathways from Zn 2 O 8 and C-O bonds to Fe-O bonds. Concretely, the atomic-layer Fe 2 O 3 is deposited on 2D porphyrinic MOF (ZnTCPP) by atomic layer deposition technique to enhance the photocatalytic performance and the subsequent bacteria-killing efficacy. After 20 min light irradiation, the photocatalytic antibacterial efficacy of 2D MOF-Fe 2 O 3 can reach up to 99.9%. The underlying mechanism of enhanced photocatalytic activity is that the heterointerface between 2D MOF and Fe 2 O 3 can facilitate the transfer of lots of photogenerated electrons from 2D MOF to Fe 2 O 3 , where 2D MOF and Fe 2 O 3 act as electronic donator and receptor, respectively. This work provides an insight into developing highly effective photocatalysts by using electron-withdrawing modulator to optimize charge transfer pathway.
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Jove-Journal of Visualized Experiments
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2022
·
IF 1.424
Zheting Chu,Jiaxin Liang,Dazhong Yang,Jing Li,Hong Chen
Heavy metal-polluted water is of great concern to human health and the eco-environment. In situ water remediation techniques enabled by highly efficient adsorption materials are of great importance in these circumstances. Among all the materials used in water remediation, iron-based nanomaterials and porous materials are of great interest, benefiting from their rich redox reactivity and adsorption function. Here, we developed a facile protocol to directly convert the widely spread red soil in south China to fabricate the Fe2O3/faujasite (FAU)-type zeolite composite material. The detailed synthesis procedure and synthesis parameters, such as reaction temperature, reaction time, and the Si/Al ratio in the raw materials, have been carefully tuned. The as-synthesized composite materials show good adsorption capacity for typical heavy metal(loid) ions. With 0.001 g/mL Fe2O3/FAU-type zeolite composite material added to different heavy metal(loid)-polluted aqueous solutions (single type of heavy metal(loid) concentration: 1,000 mg/L [ppm]), the adsorption capacity was shown to be 172, 45, 170, 40, 429, 693, 94, and 133 mg/g for Cu (II), Cr (III), Cr (VI), As (III), Cd (II), Pb (II), Zn (II), and Ni (II) removal, respectively, which can be further expanded for heavy metal-polluted water and soil remediation.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Hafiz Muhammad Adeel Sharif,Muhammad Bilal Asif,Yuwei Wang,Ya-Nan Hou,Bo Yang,Xu Xiao,Changping Li
Iron (Fe)-based catalysts are widely used for taming nitrogen oxides (NO x ) containing flue gas , but the regeneration and long-term reusability remains a concern. The reusability can be acquired by external additives, and resultantly can not only increase the cost but can also add to process complexity as well as secondary pollutants. Herein, a self-sustainable material is designed to regenerate the catalyst for long-term reusability without adding to process complexity. The catalyst is based on reduced graphene-oxide impregnated by Fe 2 O 3 -MnO (rGO@Fe 2 O 3 -MnO; G-F-M) for spontaneous intra electron (e - )-transfer from Mn to Fe. The developed catalyst; G-M-F exhibited 93.7% NO x reduction, which suggests its high catalytic activity . The morphological and structure characterizations confirmed the Fe/Mn loading, contributing to e - -transfer between Mn and Fe due to its conductivity. The synthesized G-F-M showed higher NO x reduction about 2.5 folds, than rGO@Fe 2 O 3 (G-FeO) and rGO@MnO x (G-MnO x ). The performance of G-M-F without and with an electrochemical system was also compared, and the difference was only 5%, which is an evidence of the spontaneous e - transfer between the Mn and Fe-NO x complex. The designed catalyst can be used for a long time without external assistance, and its efficiency was not affected significantly (<3.7%) in the presence of high oxygen contents (8%). The as-prepared G-M-F catalyst has great potential for executing a dual role NOx removal and self-regeneration of catalyst (SRC), promoting a sustainable remediation approach for large-scale applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Liming Zhao,Lijun Guo,Yuling Tang,Jianfei Zhou,Bi Shi
Research on the rational design of photocatalysts for efficient hexavalent chromium (Cr(VI)) reduction from Cr(VI)-containing wastewater has attracted widespread attention. In this paper, a novel g-C3N4/C/Fe2O3 photocatalyst was successfully synthesized by anchoring g-C3N4 nanosheets onto C/Fe2O3 that was prepared using collagen fiber as the biochar resource following the Fe tanning mechanism to reduce Cr(VI) under artificial solar irradiation. Under the same conditions, the as-prepared g-C3N4/C/Fe2O3 photocatalyst exhibited higher Cr(VI) reduction efficiency than g-C3N4, and the Cr(VI) reduction efficiency increased as Fe content in the g-C3N4/C/Fe2O3 photocatalyst increased. The enhanced photocatalytic performance was primarily ascribed to the formation of an indirect Z-scheme heterojunction between C/Fe2O3 and g-C3N4, which improved the separation efficiency of the photogenerated charge carrier. Furthermore, radical trapping indicated that photoinduced electrons (e–) were the main factor for Cr(VI) reduction. This work provides guidance for high value-added utilization of collagen fiber in constructing efficient light-driven photocatalysts and practical Cr(VI) removal from wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Yingjie Zhao,Li Tian,Xin Zhang,Zhuo Sun,Xiangyu Shan,Qian Wu,Ruizhan Chen,Juan Lu
A specificity recognition molecularly imprinted electrochemiluminescence sensor (MIECLS) for determination of clenbuterol (CLB) was established by molecular imprinting technology. In this sensing platform, Fe 2 O 3 was used as the carrier to fix Ru(bpy) 3 2+ , and it could also improve electrochemiluminescence (ECL) signal due to large specific surface area and better electronic transmission efficiency. The introduction of molecular imprinted membranes (MIPs) with CLB as template molecules realized the specificity identification of sensors. The intensity of the ECL signal decreased gradually when the concentration of CLB increased. Based on this characteristic, a novel method for measuring CLB was established, and the related mechanism was studied. Under the optimal conditions, the ECL response was proportional to the logarithm of CLB concentration in the range of 1 × 10 −9 mol L −1 to 1 × 10 −4 mol L −1 with a detection limit of 3.3 × 10 −10 mol L −1 . The results prove that MIECLS has great potential in pork and liver samples testing.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Ruihui Gan,Yali Wang,Wenjun Ma,Mahmut Dirican,Sa Zhao,Yan Song,Xiangwu Zhang,Chang Ma,Jingli Shi
It is highly desirable to develop high-efficiency non-precious electrocatalysts toward oxygen reduction reaction (ORR). In this work, Fe 2 O 3 -encapsulated and Fe-Nx-containing porous carbon spheres (Fe 2 O 3 /N-MCCS) with unique multi-cage structures and high specific surface area (1360 m 2 g −1 ) are fabricated. The unique porous structure of Fe 2 O 3 /N-MCCS ensures fast transportation of oxygen during ORR. The combined effect of Fe 2 O 3 nanoparticles and Fe-Nx configurations endows Fe 2 O 3 /N-MCCS (E 1/2 = 0.837 V vs. RHE) with superior ORR activity and methanol tolerance to Pt/C. And, Fe 2 O 3 /N-MCCS exhibits better stability than nitrogen-modified carbon. The characterization results of Fe 2 O 3 /N-MCCS after long-term test reveals its excellent structural stability. Impressively, zinc-air battery based on Fe 2 O 3 /N-MCCS showed a peak power density of 132.4 mW cm −2 and a specific capacity of 797 mAh g −1 , respectively.
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Inorganic Chemistry Frontiers
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2021
·Vol. 9
·期 2
·259-266
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IF 6.569
Xiao Liang,Jing Zhang,Kewei Zhang,Xiaodong Yang,Mingzhe Zhang
Surface modification is a simple and efficient method to enhance the gas sensing properties of semiconductor materials. In this paper, Fe2O3 nanoparticle-decorated ZnO nanorods are successfully fabricated by a facile two-step synthesis method. The SEM, TEM and XPS results indicate that the Fe2O3 nanoparticles grow directly on the surface of ZnO nanorods. The gas sensing properties of pure ZnO and Fe2O3/ZnO nanocomposites have been systematically analyzed. The gas response value of a 1 wt% Fe2O3/ZnO sample is 14.5 to 100 ppm triethylamine (TEA) at the optimal operating temperature of 260 °C, which is about 3 times that of pure ZnO (5.0). In addition, the 1 wt% Fe2O3/ZnO sensor reflects a rapid response/recovery time (1 s/14 s). The density functional theory (DFT) simulation results confirm that after the Fe2O3 cluster modifies the surface of ZnO, the atomic position at the interface changes significantly and the structure of Fe2O3/ZnO has the lowest adsorption energy for TEA molecules; these are the key factors for improving the gas sensitivity of the composite sample.
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ELECTROCHIMICA ACTA
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2021
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IF 6.901
Tian-Zhu Shi,Yu-Long Feng,Tao Peng,Bao-Guo Yuan
Fe 2 O 3 is one of promising negative materials for supercapacitors (SCs), because of its low cost and high theoretical value of specific capacitance. However, the inferior conductivity and insufficient ionic diffusion rate of Fe 2 O 3 will seriously hinder the electrochemical performance of Fe 2 O 3 , resulting in limiting its practical application in SCs. Herein, a sea urchin-like 3D Fe 2 O 3 was synthesized via hydrothermal methods. And then, the 2D Ti 2 C 3 T x MXene nanosheets with high conductivity closely self-assemble on the surface of Fe 2 O 3 to provide efficient pathways for the rapid electrons transport. In addition, the sea urchin-like structure of Fe 2 O 3 can facilitate the rapid diffusion of the electrolyte to accelerate faradaic reaction. The optimized Fe 2 O 3 /MXene composite as electrode material exhibits a high specific capacitance of 486.3 F g −1 at current density of 1 A g −1 , and excellent cycling stability with 95.7% capacity retention after 5000 charge/discharge cycles. Furthermore, an asymmetric supercapacitors (ASCs) device was assembled by using Fe 2 O 3 /MXene composite as anode and MnO 2 as cathode, showing a high energy density of 32.2 Wh kg −1 at the power density of 900.6 W kg −1 , and remarkable long-term durability (95.7 % capacitance retention after 5000 cycles). This work demonstrates an effective approach of integrating the sea urchin-like Fe 2 O 3 with 2D MXene nanosheets to fabricate Fe 2 O 3 /MXene composite for high-performance SCs.
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ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Yuan Wang,Zhongxing Du,Jianfei Xiao,Wanglai Cen,Shaojun Yuan
It is highly attractive to design Fe 2 O 3 -based nanocomposite anodes for supercapacitors (SCs). Herein, polypyrrole-encapsulated Fe 2 O 3 nanotube arrays grown on carbon cloth (Fe 2 O 3 NTs@PPy/CC) were fabricated by combination of sacrificial template and electrodeposition methods. Such Fe 2 O 3 NTs@PPy/CC exhibits boosted pseudocapacitance and stability. In 1 M Na 2 SO 4 , it delivers a specific capacitance of 237 mF cm −2 at 1 mA cm −2 , and still retains 80% of initial capacity at 10 mA cm −2 even after 10,000 cycles. The theoretical calculation results reveal that PPy exhibits a strong adhesion on the surface of Fe 2 O 3 , and then effectively stabilizes the electrode structure. The interface between Fe 2 O 3 and PPy possesses more stable Na + storage sites to substantially enhance pseudocapacitance. The interactions of Fe 2 O 3 nanotube arrays and conductive polymers can simultaneously cause faster ion transfer, more surface charge storage, and higher structural stability for Fe 2 O 3 . The asymmetric aqueous supercapacitor devices consisted of Fe 2 O 3 NTs@PPy and MnO 2 electrodes with maximum operating potential of 2.0 V achieve a high areal energy density of 59.4 µWh cm −2 (24.2 Wh kg −1 ) at a power density of 1 mWh cm −2 (408.2 W kg −1 ) along with good stability. This work seeks a deeper insight for synergistic effect between PPy and Fe 2 O 3 , and offers a novel strategy to design the nanostructured composite with enhanced interface area for energy storage.
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CHEMOSPHERE
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2021
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IF 7.086
Jianhui Zhao,Yuanzhou Wang,Ning Li,Shaopo Wang,Junli Yu,Xinxin Li
In this work, the magnetic γ-Fe 2 O 3 –MnO 2 bifunctional catalyst with oxygen vacancy was synthesized for peroxymonosulfate (PMS) activation under visible light. The activity of γ-Fe 2 O 3 –MnO 2 was investigated by ciprofloxacin (cipro) degradation. Results showed that 98.3% of cipro (50 μM) was removed within 30 min in visible-light/PMS system mediated by γ-Fe 2 O 3 –MnO 2 (2:1) with fine-tuned oxygen vacancy. The cipro degradation data fitted well with pseudo-first-order kinetic model with the highest kinetic constant of 0.114 min −1 . Besides, the γ-Fe 2 O 3 –MnO 2 exhibited stability, recyclability and practicability. High selectivity for cipro degradation was observed with coexisting anions in visible-light/γ-Fe 2 O 3 –MnO 2 /PMS system. Furthermore, the enhanced mechanism of PMS activation under visible light with γ-Fe 2 O 3 –MnO 2 was proposed. The appropriate oxygen vacancy enhanced the separation of photo-induced carriers and Z scheme heterostructure maintained the highest redox potential . Accordingly, the synergistic effect of photocatalysis and PMS activation enhanced cipro degradation. Free radical and non-radical species including , h + , 1 O 2 , • OH and co-existed in the coupled system. Impressively, this study provides a handy approach for oxygen vacancy regulation in metallic oxides composite and an easily recycled catalyst with high-activity in coupled oxidation system towards antibiotic degradation.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
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IF 4.872
ShuYao Xiong,XinHui Liu,XianJian Zhu,Gang Liang,ZhuoJun Jiang,BaoShan Cui,JunHong Bai
Photocatalysis has attracted wide attention due to its outstanding advantages in dealing with sewage. And compounds of metal oxides and g-C 3 N 4 that possess Z-type heterojunctions have become the star photocatalysts in degrading pollutants. In this paper, a novel one-step method for the preparation of highly efficient photocatalyst of Fe 2 O 3 /g-C 3 N 4 , using Fe (NO 3 ) 3 and urea as raw materials, is described. Under the optimized condition, the one-step synthesized photocatalyst of FeGCN-0.10 showed higher photocatalytic performance compared with the multi-step prepared photocatalyst, and the rate of removing basic fuchsin was 92% (210 min), which was 19.5% higher than that of the latter. Furthermore, different methods were also applied for characterizing Fe 2 O 3 /g-C 3 N 4. Structural characterization results confirmed the composites of Fe 2 O 3 /g-C 3 N 4 . Morphological characterization results showed that spindle-like Fe 2 O 3 particles were distributed more evenly on the layered g-C 3 N 4 compared with the impregnation method. Optical characterization results demonstrated the high intensity of the separated photo-generated electron-hole pairs and of Fe 2 O 3 /g-C 3 N 4 , which uncovered the removing mechanism of basic fuchsin.
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CHINESE CHEMICAL LETTERS
·
2020
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IF 4.632
Yongjie Li,Wei Xiang,Tao Zhou,Mingjie Huang,Chen Wang,Xiaohui Wu,Juan Mao,Penghua Wang
In this study, a carbon quantum dots modified maghemite catalyst (CQDs@ γ -Fe 2 O 3 ) has been synthesized by a one-step solvothermal method for efficient persulfate (PDS) activation under visible light irradiation. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV–vis diffuse reflectance spectroscopy (UV–vis DRS) characterization indicated that the formation of heterojunction structure between CQDs and γ -Fe 2 O 3 effectively reduced the catalyst band gap ( E g ), favoring the separation rate of electrons and holes, leading to remarkable efficient sulfamethoxazole (SMX) degradation as compared to the dark-CQDs@ γ -Fe 2 O 3 /PDS and vis- γ -Fe 2 O 3 /PDS systems. The evolution of dissolved irons also demonstrated that CQDs could accelerate the in-situ reduction of surface-bounded Fe 3+ . Electron paramagnetic resonance (EPR) and radical scavenging experiments demonstrated that both OH and SO 4 − were generated in the reaction system, while OH was relatively more dominant than SO 4 − for SMX degradation. Finally, the reaction mechanism in the vis-CQDs@ γ -Fe 2 O 3 /PDS system was proposed involving an effective and accelerated heterogeneous-homogeneous iron cycle. CQDs would enrich the photo-generated electrons from γ -Fe 2 O 3 , causing efficient interfacial generation of surface-bond Fe 2+ and reduction of adsorbed Fe 3+ . This visible light induced iron cycle would eventually lead to effective activation of PDS as well as the efficient degradation of SMX.
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危险品化学品经营许可证（带存储）