Nanomaterials
·
2018
·Vol. 8
·期 11
·877
·
IF 3.504
Guangyu Lei,Jingwen Ma,Zhen Li,Xiaobin Fan,Wenchao Peng,Guoliang Zhang,Fengbao Zhang,Yang Li
In this paper, a facile route has been developed to prepare magnetic trimetallic Au-Ag-γ-Fe2O3/rGO nanocomposites. The impact of the preparation method (the intensity of reductant) on the catalytic performance was investigated. The nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The prepared nanocomposites show fine catalytic activity towards the reduction reaction of 4-nitrophenol (4-NP). The nanocomposites also have superparamagnetism at room temperature, which can be easily separated from the reaction systems by applying an external magnetic field.
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CHINESE CHEMICAL LETTERS
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2020
·
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.
研究领域:
环境科学
·
材料科学
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Wentao Gan,Shaoliang Xiao,Likun Gao,Runan Gao,Jian Li,Xianxu Zhan
Natural wood is functionalized using the index matching poly(methyl methacrylate) (PMMA) and luminescent γ-Fe2O3@YVO4:Eu3+ nanoparticles to form a novel type of luminescent and transparent wood composite. First, the delignified wood template was obtained from natural wood through a lignin removal process, which can be used as a support for transparent polymer and phosphor nanoparticles. Then, the functionalization occurs in the lumen of wood, which benefits from PMMA that fills the cell lumen and enhances cellulose nanofiber interaction, leading to wood composites with excellent thermal properties, dimensional stability, and mechanical properties. More importantly, this wood composite displays a high optical transmittance in a broad wavelength range between 350 and 800 nm, magnetic responsiveness, and brightly colored photoluminescence under UV excitation at 254 nm. The unique properties and green nature of the luminescent wood composite have great potential in applications including green LED lighting equipment, luminescent magnetic switches, and anti-counterfeiting facilities.
研究领域:
材料科学
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光学工程
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林业工程
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Peikun Wu,Xiangkai Kong,Yingrui Feng,Wei Ding,Zhigao Sheng,Qiangchun Liu,Guangbin Ji
To design and develop efficient microwave absorbents via phase engineering is still less studied. The unique properties caused by constructing heterophase structure hold the potential to strengthen absorbing capability toward microwave radiation. Herein, amorphous/crystalline γ-Fe 2 O 3 nanosheets (Fe-H) are carefully fabricated through a controlled annealing process. The matched Fermi levels formed on both sides of the heterophase interface not only provides efficient interfacial polarizations but also facilitates the transport of electrons with less scattering over the whole Fe-H nanosheets. Thereby, both of the conduction loss and dielectric polarization relaxation are promoted, leading to a strengthened attenuation toward electromagnetic wave radiation. The as-synthesized Fe-H sample exhibited a minimum reflection loss of -89.5 dB centered at a thickness of 2.00 mm, associated with an effective absorption bandwidth (reflection loss ≤ -10 dB) reaching 6.45 GHz. All of these behaviors are superior to its pure amorphous absorbent and bare crystalline counterpart. Furthermore, this heterophase engineering strategy is valid when extended to Co and Ni based oxides, suggesting its universality and generality for promoting microwave absorption. Henceforth, this study indicates a favorable potential of the synthesis and application of amorphous/crystalline materials as heterophase microwave absorbents.
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RSC Advances
·
2012
·Vol. 2
·期 13
·5571-5579
·
IF 0
Longcheng Xu,Jianming Pan,Jiangdong Dai,Zhijing Cao,Hui Hang,Xiuxiu Li,Yongsheng Yan
This paper reports a molecularly imprinted polymers (MIPs) based fluorescence sensor which is synthesized by grafting MIP layers on the surface of ZnO nanorods embedded γ-Fe2O3 nanoparticles via activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP). Methacrylic acid (MAA, functional monomer), 3-(trimethoxysilyl)propyl mathacrylate (MPS) modified γ-Fe2O3 (γ-Fe2O3/MPS, assistant magnetic monomer) and ethylene glycol dimethacrylate (EGDMA, cross-linking monomer) were co-polymerized in anisole at 313 K in the presence of sulfamethazine as a template molecule. Sulfamethazine was then solvent-extracted to obtain ZnO-grafted molecularly imprinted polymers (ZnO-MIPs). ZnO-MIPs were characterized by FE-SEM, TEM, FT-IR, TGA/DSC, VSM, fluorescence spectroscopy and Raman spectroscopy. It was observed that sulfamethazine can quench the luminescence of ZnO-MIPs in a concentration-dependent manner that can be described by a Stern–Volmer-type equation. ZnO-MIPs were used to determine sulfamethazine in a spiked pork sample with good recognition ability. This study therefore demonstrates the potential application in the recognition and separation of antibiotics based on molecularly imprinted polymers.
研究领域:
材料科学
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分析化学
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生物医学工程
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WATER ENVIRONMENT RESEARCH
·
2019
·Vol. 91
·期 7
·588-597
·
IF 1.24
Jingyao Zhou,Yuyan Liu,Yitong Han,Fanqi Jing,Jiawei Chen
The presence of fluoride in groundwater in excess of 1.5 mg L −1 is a major environmental health concern, and biochar is a promising low-cost adsorbent for the treatment of such water. In the present study, pristine and magnetic biochars were synthesized by peanut hull and bovine bone for the adsorption of fluoride. The biochars were systematically characterized by SEM-EDS, BET, XRD, VSM, FT-IR, and XPS. The experiment results showed that the magnetic biochar prepared by soaking biomass in FeCl 3 solution and then pyrolyzing (“prepyrolysis”) had a higher adsorption capacity than that prepared by mixing pristine biochar with Fe 2+ /Fe 3+ solution and then treating with NaOH (“postpyrolysis”). The bone-derived biochar and magnetic biochar exhibited high adsorption capacity of fluoride (>5 mg g −1 ) due to the presence of hydroxyapatite (HAP) and γ-Fe 2 O 3 . The 0.1 M NaOH solution could be optimal desorption agent, and the adsorption–desorption experiments indicated the bone biochars maintained the reasonable adsorption capacity after several cycles. Moreover, the coexisting Cr(VI) and fluoride could be removed simultaneously by bone-derived biochars. It is suggested that bovine bone-derived pristine and magnetic biochars can be used as preferential adsorbents for fluoride removal from contaminated groundwater. Practitioner points Bone-derived pristine and magnetic biochars exhibit high adsorption capacity for fluoride in weakly alkaline solution. The presence of hydroxyapatite and γ-Fe 2 O 3 in bone-derived biochars plays an important role for fluoride adsorption. Magnetic biochars prepared by soaking biomass in FeCl 3 solution and then pyrolyzing (“prepyrolysis”) perform better. The coexisting Cr(VI) and fluoride can be simultaneously removed in groundwater by bone biochars.
研究领域:
环境科学
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水处理
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材料科学
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Jingtao Bi,Qingqing Tao,Jie Ren,Xin Huang,Ting Wang,Hongxun Hao
Heterojunction with same elements but different types of semiconductors is a special material which is convenient for fabrication and industrialization. In this work, a series of α/γ-Fe 2 O 3 isoelement heterostructures with different crystal contents (γ-Fe 2 O 3 , 10 % α-Fe 2 O 3 /90 % γ-Fe 2 O 3 , 33 % α-Fe 2 O 3 /67 % γ-Fe 2 O 3 , 55 % α-Fe 2 O 3 /45 % γ-Fe 2 O 3 , 78 % α-Fe 2 O 3 /22 % γ-Fe 2 O 3 and α-Fe 2 O 3 ) were constructed by hydrothermal method combined with controlled partial annealing process. Physicochemical analyses including XRD, TEM , XPS , BET, UV-Vis, PL spectra and ESR analyses were applied to investigate the advantages of isoelement α/γ-Fe 2 O 3 compared with the pure single-crystalline Fe 2 O 3 . Benefiting from the enlarged specific surface area and staggered band structure, the fabricated heterostructure with 78 wt% α-Fe 2 O 3 content exhibited more efficient separation of charge carriers and thus superior photodegradation efficiency than pure Fe 2 O 3 under visible-light irradiation. Different from TiO 2 -based P25 heterostructures, Fe 2 O 3 system possesses narrower bandgap and cannot efficiently consumed the excited holes. As a result, the accumulated h + would inhibit the further separation of excitons with photocatalysis proceeding and thus induce insufficient driving force for the increment of photocatalytic ability like P25. The results presented in this work would be conducive to the rational design of staggered heterostructures.
研究领域:
材料科学
·
环境科学
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RSC Advances
·
2020
·Vol. 10
·期 29
·17154-17162
·
IF 3.119
Ang Li,Yuxiang Liu,Xuejun Xu,Yuanyuan Zhang,Zhichun Si,Xiaodong Wu,Rui Ran,Duan Weng
Constructing Z-scheme heterojunctions is considered as an effective strategy to obtain catalysts of high efficiency in electron–hole separation in photocatalysis. Unfortunately, suitable heterojunctions are difficult to fabricate because the direct interaction between two semiconductors may lead to unpredictable negative effects such as electron scattering or electron trapping due to the existence of defects which causes the formation of new substances. Furthermore, the van der Waals contact between two semiconductors also results in bad electron diffusion. In this work, a MOF-derived carbon material as a Z-scheme photocatalyst was synthesized via one-step thermal treatment of MoS2 dots @Fe-MOF (MIL-101). Under visible light irradiation, the well-constructed Z-scheme (MoS2, γ-Fe2O3)/graphene photocatalyst shows 2-fold photocatalytic oxygen evolution activity (4400 μmol g−1 h−1) compared to that of γ-Fe2O3/graphene (2053 μmol g−1 h−1). Based on ultraviolet photoelectron spectrometry (UPS), Mott–Schottky plot, photocurrent and photoluminescence spectroscopy (PL) results, the photo-induced electrons from the conduction band of γ-Fe2O3 could transport quickly to the valence band of MoS2 via highly conductive graphene as an electron transport channel, which could significantly enhance the electron–hole separation efficiency as well as photocatalytic performance.
研究领域:
材料科学
·
光催化
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高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Cheng Wang,Shuijing Zhou,Xiaoming Wang,Wenfeng Tan,Xionghan Feng
Photo-catalyzing sulfite (S(IV)) for the generation of sulfate radical (SO 4 •- ) has emerged as a novel advanced oxidation process (AOP) recently. However, both the potential of soil minerals as effective photocatalysts and the process of water acidification due to S(IV) oxidation have been overlooked. Herein, maghemite (γ-Fe 2 O 3 ), a typical soil iron oxide with excellent photocatalytic reactivity like hematite and magnetic-collectible property like magnetite, was successfully used to activate S(IV) for iohexol degradation under visible light irradiation. As a result, 91.3% of iohexol was eliminated within 15 min at 0.1 g/L maghemite and 0.5 mM S(IV) under neutral conditions. The influencing factors, including initial pH, catalyst dosage, S(IV) amount, co-existing substances and water matrix, were systematically investigated. The maghemite/S(IV)/vis system exhibited superior performance in iohexol degradation at a wide pH range (3–10). It was found that the released proton via S(IV) oxidation led to severe water acidification. Interestingly, a low dose of HCO 3 − could evidently resist water acidification with little influence on iohexol elimination. Radical quenching experiments and electron spin resonance (ESR) analysis confirmed that SO 4 •- , •OH and •O 2 − were involved in iohexol abatement with SO 4 •- being the dominant reactive species. Compared with hydrogen peroxide, persulfate and peroxymonosulfate, the established maghemite/S(IV)/vis system achieved much more remarkable degradation performance. Furthermore, the reactivity of the catalyst was not obviously reduced even after 10 runs of reaction. This study expands the application of soil iron oxide mineral in S(IV) activation in water treatment and proposes an approach to regulate water acidification in S(IV)-based AOP.
研究领域:
环境科学
·
化学工程
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PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 9
·3753-3772
·
IF 3.134
Hou Qingyao,Qin Langlang,Peng Xueer,Zhou Chenyang,Li Xuelian,Zhang Jiandong,Gao Lili
The development of catalysts with high catalytic activity and convenient recycling property is the long-term goal of sulfate-based advanced oxidation processes for the degradation of organic pollutants. In this work, a kind of iron/copper oxide hybrid catalyst (α-Fe 2 O 3 /γ-Fe 2 O 3 /Cu 2 O, CuFe-13) with both higher catalytic performance and paramagnetism was synthesized using a modified method for conventional CuFeO 2 . Through X-ray diffraction and infrared spectra characterization, the catalyst was verified a hybrid of α-Fe 2 O 3 , γ-Fe 2 O 3 and Cu 2 O, in which the exist of magnetic γ-Fe 2 O 3 was the main cause for CuFe-13’s paramagnetism and convenient magnetic recycling property. The mechanism for CuFe-13’s excellent catalytic performance was primarily investigated. Through scanning electron microscope, X-ray photoelectron spectroscopy, N 2 adsorption–desorption measurement, radical quenching experiments, and electron paramagnetic resonance characterization analysis, the CuFe-13 represented larger surface area, bigger porosity, more efficient synergistic effect among Cu, Fe, and O than CuFeO 2. The generation of various of reactive oxygen species (ROS), including sulfate radical ( \({\text{SO}}_{4}^{\cdot - }\) ), hydroxyl radical ( · OH), and singlet oxygen ( 1 O 2 ), especially 1 O 2 were more, which might lead to CuFe-13’s higher catalytic performance. The effects of PMS concentration, CuFe-13 dosage, initial pH, initial OG concentration were analyzed. The optimal removal efficiency of OG could be achieved 100% within 20 min with 1 mM PMS and 0.2 g L −1 CuFe-13 under neutral condition. This study provided an efficient PMS-activated catalyst for degradation of organic pollution.
研究领域:
环境科学
·
催化化学
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Yunxiang Luo,Tongtong Zhang,Yang Qin,Fujie Zhao,Hongchen Wang,Guohua Liu,Lu Qi
Bisphenol A (BPA), an emerging wastewater contaminant, poses significant ecological risks even in trace concentrations, necessitating advanced removal strategies. In this study, a novel γ-Fe2O3-embedded nitrogen-doped polydopamine-derived carbon composite adsorbent (Fe-PC) was synthesized using polydopamine as a self-nitrogen-doped carbon precursor rather than a conventional shell material. The Fe-PC adsorbent exhibited a high BPA adsorption capacity of 423.86 mg g–1 and rapid equilibrium within 120 min. Adsorption kinetics followed a pseudo-second-order model (R2 = 0.999), while equilibrium data aligned with the Langmuir isotherm, indicating monolayer chemisorption is the dominant mechanism. Thermodynamic analysis confirmed that the process is spontaneous and endothermic. Mechanistic investigations revealed that γ-Fe2O3 introduces abundant active sites, enabling synergistic adsorption via chemical bonding, π–π interactions, hydrophobic interactions, and Fe3+ coordination with BPA hydroxyl groups. Combining high adsorption capacity, rapid kinetics, and stability, Fe-PC offers a promising strategy for efficiently removal of emerging contaminants from water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Xiaohui Wu,Mingjie Huang,Tao Zhou,Juan Mao
A novel magnetic molecular imprinting composites (MICs) were successfully synthesized through cross-linked chitosan and γ-Fe 2 O 3 particles, and the selective removal of aqueous NOR was demonstrated. The γ-Fe 2 O 3 particles embedded in MICs were still of intrinsic crystal and complexed with both amino and hydroxyl groups of chitosan. Adsorption behavior of NOR onto MICs could be described by the pseudo-second-order kinetic and the Langmuir isotherm model. Excellent selective NOR adsorption was identified with competition of sulfadiazine (SD), ofloxacin (OFL) and phenol, respectively. It could be ascribed to the memory cavities for NOR molecules, as well as the formation of triple intermolecular hydrogen bonds with suitable angle and length. Furthermore, application feasibility of MICs in NOR-spiked municipal wastewater treatment plant (WWTP) effluent was investigated. Competing with the effluent organic matters (EfOM), effective adsorption performance of NOR could be still obtained. Effect of humic and fulvic acid-like organics could be effectively reduced, while adsorption of tryptophan-like substances was slightly enhanced. In addition, it was found that Fenton-like oxidation instead of NaOH washing would be more appropriate for the multiple regenerations of MICs. The former would reserve more memory cavities and lead to oxidative decomposition of the desorbed NOR into micromolecular organics of low environmental impacts.
研究领域:
环境科学
·
材料科学
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危险品化学品经营许可证（带存储）