Journal of Environmental Sciences
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2018
·
IF 3.12
Tuqiao Zhang,Feilong Dong,Feng Luo,Cong Li
Sulfonamides are used in human therapy, animal husbandry and agriculture but are not easily biodegradable, and are often detected in surface water. Sulfamethazine (SMZ) and sulfadiazine (SDZ) are two widely used sulfonamide antibiotics that are used heavily in agriculture. In this study, they were degraded in an aqueous system by chlorination after pre-oxidation with ferrate(VI) (Fe VI O 4 2 − , Fe(VI)), an environmentally friendly oxidation technique that has been shown to be effective in degrading various organics. The kinetics of the degradation were determined as a function of Fe(VI) (0–1.5 mg/L), free chlorine (0–1.8 mg/L) and temperature (15–35°C). According to the experimental results, SMZ chlorination followed second-order kinetics with increasing Fe(VI) dosage, and the effect of the initial free chlorine concentration on the reaction kinetics with pre-oxidation by Fe(VI) fitted a pseudo-first order model. The rate constants of SDZ and SMZ chlorination at different temperatures were related to the Arrhenius equation. Fe(VI) could reduce the levels of THMs formed and the toxicity of the sulfonamide degradation systems with Fe(VI) doses of 0.5–1.5 mg/L, which provides a reference for ensuring water quality in drinking water systems.
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高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 9
·2211-2217
·
IF 5.106
Xianghong Li,Xu Sun,Xiang Ren,Dan Wu,Xuan Kuang,Hongmin Ma,Tao Yan,Qin Wei
Electrochemical oxygen reduction is a key process for many energy storage and conversion devices, and finding highly efficient, economical, and durable electrocatalysts to replace the Pt-based catalyst for the oxygen reduction reaction (ORR) is a critical obstacle. In this article, porous Fe–N-codoped materials are obtained by pyrolysis of a defined precursor of polydopamine-coated Fe3O4 as not only template but also nitrogen and iron source. In 0.1 M KOH, the as-prepared catalyst exhibited high ORR activity (onset potential of 0.949 V and half-wave potential of 0.836 V vs. RHE), with excellent electrochemical stability, durability and remarkable tolerance toward methanol. The successful synthesis of porous nanospheres provides a novel way to explore a series of mesoporous metal electrocatalysts for energy conversion.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Shumin Wu,Xianliang Li,Yan Xu,Junbiao Wu,Zhuopeng Wang,Yide Han,Xia Zhang
Hierarchically spinel Ni x Co 1- x Fe 2 O 4 (0.0 ≤ x ≤ 0.5) microcubes were successfully prepared through a combined solvent evaporation strategy and morphology-inherited annealing treatment. By using the Fe-based metal-organic frameworks (MOFs), Fe 4 (Fe(CN) 6 ) 3 , and inorganic Ni 2+ and Co 2+ acetate salts as co-templated precursors, hierarchical Ni-doped spinel CoFe 2 O 4 architecture can be obtained, and the Ni/Co substitution ratios can be controlled systematically. The obtained cubic hierarchical Ni x Co 1- x Fe 2 O 4 , (0.0 ≤ x ≤ 0.5) composites presented highly acetone sensing properties, among which the Ni 0.1 Co 0.9 Fe 2 O 4 composite showed the strongest response performance (with gas response ( R g / R a ) of 1.67 at 240 °C) and excellent reproducibility (for at least 14 cycles), and the proposed acetone sensing mechanism was also discussed. The presented solvent evaporation and co-templated strategy may allow precisely access to fabricating other heteroatom doped inorganic materials with intriguing morphologies, architectures, chemical compositions and tunable sensing properties.
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Journal of Analysis and Testing
·
2018
·Vol. 2
·期 1
·69-76
·
IF 0
Zhen Wen-Yao,Bai Jing,Jia Xiao-Dan,Wu Lie,Jiang Xiu-E
The local tumor hypoxia has become one of the main obstacles for photodynamic therapy (PDT).To break through this barrier, the fabrication of O 2 -evolving nanoplatform has been more significant. Herein, the uniform methylene blue (MB)–bovine serum albumin (BSA)–Fe(III) nanoparticles (MB–BSA–Fe(III) NPs) were successfully synthesized by biomineralization approach. MB–BSA–Fe(III) NPs show high loading capacity of MB, and Fe(ΙΙΙ) has excellent catalytic performance towards abundant H 2 O 2 in cancer cells to generate O 2 , overcoming tumor hypoxia. All these combination effects remarkably increase the therapeutic efficiency of PDT, resulting in almost complete destruction of cancer cells. Most importantly, MB–BSA–Fe(III) NPs exhibit T 2- magnetic resonance imaging, which have the potential for precise visualization of the tumor location. Our results demonstrate that MB–BSA–Fe(III) is a novel H 2 O 2 -responsive and O 2 -evolving nanoplatform and it has great potential for clinical applications such as cancer diagnosis, treatment or drug delivery.
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Canadian Journal of Chemistry
·
2018
·Vol. 96
·期 8
·
IF 1.084
Yongshu Li,Nizhou Xu,Guangyao Mei,Yun Zhao,Yiyong Zhao,Jinghui Lyu,Guofu Zhang,Chengrong Ding
A mild, simple process for the effective aerobic oxidative deoximation of a wide range of ketoximes and aldoximes has been developed that utilizes Fe(NO3)3·9H2O as the single catalyst and molecular oxygen as the green oxidant. The environmentally benign protocol provides moderate to excellent yield and broad functional groups tolerance and is a valuable synthetic method for practical applications. According the relevant verification experiment, a plausible mechanism has been proposed.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2018
·Vol. 165
·期 7
·H348
·
IF 3.662
Le Wang,Hangjia Shen,Sanshuang Gao,Xamxikamar Mamat,Guangzhi Hu
As an excellent catalyst toward hydrogen peroxide reduction, Fe-based nanomaterial like Fe-N-C configuration is promising candidate to be used for H2O2 sensing. In this work, a novel N-doped mesoporous carbon by atomically dispersed Fe-N dopant composite modified electrode (Fe/NOMC) was prepared by hard template approach and then fabricated non-enzymatic sensor was used for H2O2 determination. The morphology and property of Fe/NOMC composite were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), small angle X-ray diffraction (XRD) spectrum and nitrogen-sorption measurement, respectively. The electrochemical sensing performance of the Fe/NOMC composite modified glassy carbon electrode (GCE) was studied by cyclic voltammetry and chronoamperometry methods. An excellent performance toward hydrogen peroxide reduction was achieved in a wide range of 8–23000 μM, with limitation of detection (LOD) about 5 μM and a correlation coefficient of 0.998, as well as a short response time (2 s) and good selectivity.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Shengchao Miao,Zhenxing Zha,Ying Li,Xinxiang Geng,Jiahui Yang,Shihai Cui,Jing Yang
The novel semiconductor heterojunction of MIL-53(Fe)/BiOCl composite was first prepared through the solvothermal reaction. The prepared materials were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunner-Emmet-Teller (BET) and ultraviolet-visible diffuse reflectance spectroscopy (DRS). MIL-53(Fe)/BiOCl heterojunction is a kind of photoexcited materials and it accelerates the photoreactivity of BiOCl under the visible light irradiation. It was used to remove Rhodamine B (RhB) with the existence of persulfate (PS). The UV–vis spectrophotometer and the TOC detector show that the degradation rate and TOC removal efficiency of RhB (20 mg/L) are 99.5% and 69.4%within 30 min visible-light irradiation, respectively. Due to the proper band gap of material and the presence of electron acceptor, PS, the survival time of active radicals are increased. The active species h + , ·SO 4 − and ·OH are found to play the important roles during the reaction system. The possible mechanism for the RhB degradation of MIL-53(Fe)/BiOCl/PS is also proposed. Furthermore, the results of the material reusability for the degradation of RhB indicate that the MIL-53(Fe)/BiOCl has a good stability and can be used in the environmental water sample treatment.
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ACS Applied Energy Materials
·
2018
·
IF 0
Nan Jia,Qiaozhen Xu,Fengqi Zhao,Hong-Xu Gao,Jiaxin Song,Pei Chen,Zhongwei An,Xinbing Chen,Yu Chen
The electrochemical kinetics of oxygen reduction reaction (ORR) determines the energy conversion efficiency of fuel cells and metal–air batteries. Thus, developing efficient and low-cost electrocatalysts for the ORR has attracted mounting attention. Herein, a facile synthetic route is presented to achieve atomic dispersion of Fe–Nx species in N doped porous carbon nanocages, resulting in a single-atom ORR electrocatalyst. The obtained Fe/N codoped carbon nanocages exhibit a comparable half-wave potential (0.82 V) and higher limiting current density compared to the commercial Pt/C electrocatalyst. In addition, by using it as air electrode electrocatalyst, the assembled Zn–air battery device shows a specific capacity of 705 mAh g–1 at 5 mA cm–2 and a negligible voltage loss after continuous operation for 67 h. The superior performance of Fe/N codoped carbon nanocages is attributed to the porous structure and the synergetic effect of atomically dispersed Fe–Nx species and N doping.
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Energy Technology
·
2019
·Vol. 7
·期 10
·1900649
·
IF 3.163
Yiqun Du,Shimeng Zhao,Cheng Xu,Wenyang Zhang,Pan Li,Huixin Jin,Youjian Zhang,Zihan Wang,Jianxin Zhang
Rechargeable aluminum batteries (RABs) have been intensively studied recently in virtue of high volumetric energy density and cheapness. However, limited options for suitable cathode materials is the major obstacle to their large-scale application. Herein, nickel-iron layered double hydroxide (NiFe–LDH) microspheres with reduced graphene oxide (rGO) are reported as cathode for RABs. It is demonstrated that NiFe–LDH can provide large interlayer spacing for aluminum ions to interact, and the introduction of rGO endows NiFe–LDH with excellent structure stability, electronic conduction, and electrochemical reaction kinetics. The aluminum battery with a NiFe–LDH/rGO cathode delivers a high reversible capacity of 131 mA h g −1 at 1 A g −1 with nearly 100% coulombic efficiency after 100 cycles. The characterization results reveal that the reversible Al 3+ insertion/extraction along with the multielectron redox reactions occurs in the NiFe–LDH/rGO during the cycling process. The aforementioned strategies shed new light on the selection of compatible cathodes for RABs.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Yunwen Wu,Xiaotong Chen,Yu Han,Dongting Yue,Xinde Cao,Yixin Zhao,Xufang Qian
Nanoscale zerovalent iron (nZVI) particles have received much attention in environmental science and technology due to their unique electronic and chemical properties. However, the aggregation and oxidation of nZVI brings much difficulty in practical application of environmental remediation. In this study, we reported a composite nano-Fe(0)/mesoporous carbon by a chelation-assisted coassembly and carbothermal reduction strategy. Nano-Fe(0) particles with surface iron oxide (Fe2O3·FeO) were wrapped with graphitic layers which were uniformly dispersed in mesoporous carbon frameworks. The unique structure made the nano-Fe(0) particles stable in air for more than 20 days. It was used as a peroxydisulfate (PDS) activator for the oxidation treatment of 2,4,6-trichlorophenol (TCP). The TOF value of MCFe for TCP degradation is nearly 3 times higher than those of FeSO4 and Fe2O3·FeO and nearly 2 times than that of commercial nZVI. The reactive oxygen species (ROS) including •SO4–, HO•, and •O2–, 1O2 are efficiently generated by PDS activation with MCFe. The PDS activation process by nano-Fe(0) particles was intrinsically induced by the ferrous ions (Fe(II)) continuously generated at the solid/aqueous interface. Namely, the nano-Fe(0) particles were highly efficiently utilized in sulfate radical-based advanced oxidation processes (SR-AOP). The porous structure also assists the absorption and transfer of TCP during the degradation process.
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Weirui Chen,Xukai Li,Yiming Tang,Jialu Zhou,Dan Wu,Yin Wu,Laisheng Li
A flexible catalyst, Fe-Cu-MCM-41, was employed to enhance diclofenac (DCF) mineralization and inhibit bromate formation in catalytic ozonation process. Greater TOC removal was achieved in Fe-Cu-MCM-41/O 3 process (78%) than those in Fe-MCM-41/O 3 (65%), Cu-MCM-41/O 3 (73%) and sole ozonation (42%). But it was interesting that both Cu-MCM-41/O 3 and Fe-MCM-41/O 3 achieved 93% bromate inhibition efficiency, only 71% inhibition efficiency was observed in Fe-Cu-MCM-41/O 3 . Influence of pH, TBA/NaHSO 3 and detection of by-products were conducted to explore the mechanism. By Pyridine adsorption–IR and XPS, a relationship was found among activity of catalysts, Lewis acid sites and electron transfer effect between Fe (II/III) and Cu (I/II). Fe-Cu-MCM-41 promoted ozone decomposition to generate OH, which accounted for enhanced DCF mineralization. The consumption of aqueous O 3 also suppressed the oxidative of Br − and HBrO/Br − . More HBrO/BrO − accumulated in catalytic ozonation process and less bromate generated. Bromate formation in Fe-Cu-MCM-41/O 3 process was sensitive with pH value, the acidic condition was not favor for bromate formation. Both DCF mineralization and bromate inhibition were influenced by surface reaction. Moreover, Fe-Cu-MCM-41 showed excellent catalytic performance in suppressing the accumulation of carboxylic acid, especially for oxalic acid. Nearly no oxalic acid was detected during Fe-Cu-MCM-41/O 3 process.
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高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 6
·期 3
·558-567
·
IF 5.256
Xueai Li,Daxue Du,Chunsheng Wang,Haiyan Wang,Zhaopeng Xu
To satisfy the requirements of high-performance electromagnetic wave absorbers, composites of carbon and ferromagnetic metal with designed morphologies and abundant interfaces are highly desirable to balance impedance matching and attenuation. However, the synthesis of composites to meet these requirements and analysis of the electromagnetic wave energy loss mechanism remain great challenges. In this study, hierarchical rose-like assemblies of carbon–wrapped iron (Fe@C) nanoparticles with a porous structure were successfully synthesized via an in situ route using an iron alkoxide precursor with a rose-like morphology. Under the studied pyrolysis atmosphere and temperature, rose-like Fe@C and pure iron can be well modulated. The carbon shell is graphitic and highly ordered due to the catalytic effects of the iron nanoparticles, which affect the electromagnetic properties of the composites. The electromagnetic wave absorption properties of the Fe@C composite and iron are estimated in the frequency range of 2.0–18.0 GHz, and as expected, the hierarchical rose-like porous Fe@C demonstrates outstanding reflection loss characteristics with a minimum value of −71.47 dB with a thin matched thickness of 1.48 mm. Moreover, an ultra-wide response bandwidth (reflection loss of less than −10 dB) of 2.88–18.0 GHz is achieved. Analysis of the electromagnetic properties revealed that the hierarchical rose-like Fe@C presents very different electromagnetic functions in comparison to pure iron and Fe@C particles without the rose-like structure derived from the iron alkoxide precursor with the same structure. The carbon shells and special morphology with a certain microstructure can effectively regulate the complex permittivity and permeability to modify the impedance matching characteristic as well as enhance the attenuation ability via electromagnetic wave multiple reflection and scattering in the hierarchical rose-like Fe@C particles. Analysis of the attenuation constant and matched characteristic impedance validates that the enhanced electromagnetic wave absorption of the rose-like Fe@C with a porous structure is due to the significant enhancement of matched impedance and collective multiple loss mechanism.
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