CARBON
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2019
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IF 7.466
Wei Miao,Ying Liu,Xiaoyan Chen,Yixin Zhao,Shun Mao
In recent years, design high catalytic graphitic carbon nitride (g–C 3 N 4 )–based catalysts has drawn broad attention in environmental remediation. In this work, a series of iron-doped g-C 3 N 4 compounds were synthesized through a simple bottom-up strategy. By controlled pyrolysis , iron-doped g-C 3 N 4 materials split from bulk structure into multi-layer structure with uniformly dispersed mesopores. The catalytic activities of layered iron-doped g-C 3 N 4 in Fenton-like and photo-Fenton-like processes were investigated. Due to the doped iron, unique layered structure, and mesopore feature, the catalysts present greatly enhanced performance in heterogeneous Fenton-like reactions. Moreover, the degradation parameters calculated by the pseudo-first-order kinetic model fitted well with the specific surface area of the catalyst, indicating that the catalytic activities rely heavily on the specific surface area of layered and porous g-C 3 N 4 . This study presents a facile and generic method to regulate C 3 N 4 morphology and structure for enhanced catalytic activity in Fenton-like reactions.
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Yixuan Huang,Hao Lin,Yanhui Zhang
Carboxylate systems with inert oxide, namely, MIL-101(Fe)/SiO 2 , have been prepared by hydrothermal reactions and characterized. MIL-101(Fe)/SiO 2 exhibits superior catalytic activities for p -nitrophenol reduction with a high conversion of 93.8% in 4 min. It is obvious that the catalytic activity for reduction of nitroaromatic compounds is enhanced, however, the proportion of active components on a catalyst is reduced. One hypothesis is that the interfacial effect between SiO 2 and MIL-101(Fe) complexes helps to increase the catalytic activity. The increase of the interface component greatly improved the free energy of the interface of the solid, and the structure-related properties such as the ion valence state and the electron motion transfer of the interface have undergone considerable changes. In addition, the stability of the catalyst under the conditions of different acid-base was also investigated. It is supposed to broaden the application of the interface effect of the complex with SiO 2 .
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SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Yongjie Wan,Jinquan Wan,Yongwen Ma,Yan Wang,Ting Luo
In this study, four typical modulators (NH 4 OH(A), CH 3 COOH(B), CH 3 COONa(C) and CH 3 COONH 4 (D)) were applied to modulate the microwave-assisted synthesis of Fe-MOFs. The effects of various modulators on the yield, electrochemistry activity and PS activation capacity of prepared catalysts were systematically investigated. The ideal modulator was revealed as the 7.5 mM CH 3 COONH 4 . Contributed by the defects caused by the dual effects of CH 3 COONH 4 , Fe-MOFs-D-7.5/PS system showed excellent orange G (OG) degradation with high reaction stoichiometric efficiency (RSE) and desirable recycling performance. The main radicals should be SO 4 ·− and O 2 ·− which were confirmed by EPR and chemical quenchers. Furthermore, the frontier molecular orbital (FMO) theory and dual descriptor (DD) method were employed in predicting radical attacking sites of OG. According to the results of theoretical computations and experimental detection, degradation pathways of OG in Fe-MOFs-D-7.5/PS system were proposed. Similar to the function of the battery, this study gives new insight into the possible mediatory roles of Fe-MOFs-D-7.5 in PS activation by transferring the electrons between PS and the unsaturated metal sites (CUS). The Fe-MOFs-D-7.5/PS system is a promising process for environmental remediation.
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PubMed
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POWDER TECHNOLOGY
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2019
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IF 3.413
Zhi-Bo Li,Guo-Hua Zhang,Kuo-Chih Chou
The ultrafine composite powders of two different compositions (90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe, wt%) were synthesized by a two-stage reduction process consisting of carbothermic pre-reduction and the following deep reduction by hydrogen, and then the densification behaviors of them were investigated. The prepared W-Ni-Fe composite powders by the new proposed two-stage method had the particle size ranged from 200 nm to 400 nm. The sintered compacts of these two kinds of W-Ni-Fe powders achieved nearly full densification at a sintering temperature of 1400 °C within 3 h. The maximum hardness of the alloys obtained at 1300 °C were 411 HV and 358 HV, and the bending strength of >1500 MPa was achieved at 1400 °C for the compositions of 90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe, respectively. Meanwhile, the bending fracture mechanism was also investigated, which was different for the samples sintered at different temperatures.
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ACS Catalysis
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2019
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IF 12.221
Chao Hu,Silin Bai,Lijun Gao,Sucen Liang,Juan Yang,Shao-Dong Cheng,Shao-Bo Mi,Jieshan Qiu
Metal-doped zeolitic imidazolate framework-8 (ZIF-8)-derived carbon materials are attractive for the electrocatalytic reduction of CO2 into CO. In such carbon materials, due to the fusion and aggregation of ZIF-8 precursors during the high-temperature pyrolysis process, it is desirable yet still challenging to create a high specific surface area with more active sites available for reacting with reactants. Using SiO2 as a protective coating on the ZIF-8 surface, we synthesize Fe, N-co-doped porous carbon nanoparticles (Fe-CNPs) which possess a hierarchical pore structure with a specific surface area as high as 1156.6 m2 g–1, much higher than the counterparts without a SiO2 coating (360.1 m2 g–1). Over these highly porous Fe-CNPs, the total current densities are more than 3 times higher than those of the lowly porous ones for the electrochemical CO2 reduction. More importantly, the maximum CO Faradaic efficiency for Fe-CNPs increases from ca. 75.0 to 98.8% in a concentrated KHCO3 solution (1 mol L–1). The porosity-induced high selectivity for CO production is also revealed on Ni-doped and Co-doped ZIF-derived CNPs, suggesting a new pathway for designing high-performance carbon catalysts through engineering the porosity for the electrochemical CO2 reduction.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 36
·36410-36422
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IF 2.914
Latif Abdul,Kai Sun,Si Youbin
This study demonstrated, for the first time, Fe(III)/peroximonosulphate (PMS) could be an efficient advanced oxidation process (AOP) for wastewater treatment. Bisphenol A (BPA) was chosen as a model pollutant in the present study. Fe(III)-activated PMS system proved very effective to eliminate 92.18% of BPA (20 mg/L) for 30-min reaction time at 0.50 mM PMS, 1.5 g/L Fe(III), pH 7.0. The maximum degradation of BPA occurred at neutral pH, while it was suppressed at both strongly acidic and alkaline conditions. Organic and inorganic ions can interfere with system efficiency either positively or negatively, so their interaction was thoroughly investigated. Furthermore, the presence of organic acids also affected BPA degradation rate, especially the addition of 10 mM citric acid decreased the degradation rate from 92.18 to 66.08%. Radical scavenging experiments showed that SO 4 •– was the dominant reactive species in Fe(III)/PMS system. A total of 5 BPA intermediates were found by using LC/MS. A possible degradation pathway was proposed which underwent through bridge cleavage and hydroxylation processes. Acute toxicity of the BPA degradation products was assessed using Escherichia coli growth inhibition test . These findings proved to be promising and economical to deal with wastewater using iron mineral for the elimination of organic pollutants.
Graphical abstract
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VACUUM
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2019
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IF 2.515
Kun Wang,Xiaobing Huang,Tao Zhou,Haiyan Wang,Huasheng Xie,Yurong Ren
Li 2 FeSiO 4 /C cathode composites were fabricated from a simple solid-state approach using precursor Fe-MOFs prepared by hydrothermal process. The Li 2 FeSiO 4 /C composites covered by carbon film with diverse contents were characterized using XRD , SEM , galvanostatic charge-discharge measurement and EIS, and so on. Results of the investigation prove that Li 2 FeSiO 4 /C composites with 19.3 wt % carbon layer present prominent electrochemical capability, which delivered the discharge capacity of 154, 138, 129, 117 and 100 mA h g −1 at 0.2, 0.5, 1, 2 and 5 C, respectively. After 100 cycles, discharge capacity retained 97.4% compared to the original value at 2 C. Furthermore, it possesses the lowest charge transfer resistance as well as the highest Li + diffusion coefficient , attributing to uniform carbon coating and porous structure for Li 2 FeSiO 4 /C composites.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Junxia Guo,Jinhe Shu,Jun Nie,Guiping Ma
In this work, oxygen reduction reaction (ORR) electrocatalysts Fe/Ni bimetal and nitrogen co-doped porous carbon fibers (Fe x /Ni y -NPCF), derived from electrospun nanofiber , have been prepared. In order to optimize the ORR performance of one dimension (1D) catalysts, SiO 2 were used as template to create the hierarchical porous structure. The morphology of Fe x /Ni y -NPCF was investigated by scanning electron microscope (SEM) and transmission electron microscope (TEM). By adjusting the ratio of iron and nickel, the influence of the trace of secondary-metal doping in electrocatalyst on catalytic activity was deeply studied. The electrochemical measurements suggested that the trace of secondary-metal doping was good for increasing the half-wave potential of electrocatalyst. The optimized Fe 28 /Ni 2 -NPCF exhibited an excellent catalytic activity with an onset potential of 0.96 V and a half-wave potential of 0.88 V, which are comparable to that of the benchmark 20 wt% Pt/C. This excellent catalytic performance was derived from secondary-metal doping and abundant pore structure .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Lu Fan,Yingxi Wang,Ling Li,Jianggang Zhou
In this study, 2-amino-terephthalic acid was designed for construction of MOFs , and carbon quantum dots (CQDs) were designed to activate the Metal Organic Frameworks (MOFs) to be used as fluorescent sensor for selectively detection for Fe 3+ and Cu 2+ , enhancing the fluorescence to an “on” state by the hybrid with CQDs in the MOFs as activating agent; quenching the fluorescence to an “off” state by removal of CQDs through the metal competitive coordination substitution strategy. Using this strategy, the prepared CQDs/MOFs material can be used as a fluorescence “on-off” probe for highly sensitive detection of Fe 3+ and Cu 2+ in aqueous solution. It was found that the LOD of CQDs/MOFs for sensing Fe 3+ and Cu 2+ were 2.3 ppb and 1.3 ppb, respectively. It was proved that the CQDs/MOFs has little cytotoxicity to 4T-1 cells, indicating the potential application in the detection for Fe 3+ and Cu 2+ ions in cells.
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FUEL
·
2022
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IF 8.035
Hui Li,Tianyu Wang,Yangyang Wang,Fengsheng Liu,Yan Li,Yunpu Wang,Min Guo,Guoning Li,Xiaoling Ma
Sulfated metal oxides are widely used in catalyzing esterification for biodiesel production due to their low corrosivity and easy separation. While, the catalytic stability is still a challenge on account of active site leaching during successive batch experiments. To this end, the typical metal organic frameworks, MIL-100(Fe) doped with Co was adopted to load ammonium sulfate ((NH 4 ) 2 SO 4 ) for stable heterogeneous acid preparation, which was employed to catalyze the esterification of methanol and oleic acid. Influence of preparation factors of (NH 4 ) 2 SO 4 loading amount and activation temperature on catalytic activity were initially evaluated. Furthermore, to elucidate the effect of Co doping, catalysts were characterized by TG, XRD, FTIR, nitrogen adsorption–desorption, Py-FTIR, XPS, SEM and NH 3 -TPD. Results indicated that the maximum esterification conversion of 92.56 % was achieved by MS(Fe/Co) with molar ratio of methanol to oleic acid of 8:1 and catalyst amount of 8 wt% at 70 °C in 2 h. In comparison to MS(Fe), Co doping significantly improved the stability, where the catalytic activity of MS(Fe/Co) was increased by 20 % at the fifth cycle. The activation energy and pre-exponential factor of esterification catalyzed by MS(Fe/Co) were also calculated as 42.06 kJ/mol and 5.24 × 10 5 min −1 . This study provides a feasible way to enhance the catalytic stability of heterogeneous acid for biodiesel production.
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Materials Today Chemistry
·
2022
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IF 7.613
W. Li,M. Gan,L. Ma,W. Zhao,W. Zhan,S. Deng,F. Xie
A highly active and stable anode catalyst for direct methanol fuel cells is critical to commercialization. Therefore, we have synthesized a unique Fe-doped catalyst Fe–PtBi 2 /Bi 2 O 2 CO 3 -NC through the classical hydrothermal method and sodium borohydride reduction. Physical characterizations confirm the existence of Bi 2 O 2 CO 3 nanosheets and successful loading of PtBi nanocages. It is the alternating layer arrangement of Bi 2 O 2 CO 3 , the bifunctional mechanism of PtBi alloy and the synergistic effect of each component that make the synthesized Fe–PtBi 2 /Bi 2 O 2 CO 3 -NC possess such remarkable methanol oxidation reaction activity (a mass activity of 9345 mA/mg Pt in alkaline electrolyte). Moreover, electrochemical measurements also indicate that 51.7% of the mass activity was retained after 1 h durable operation, which is approximately 4.1 times than that of commercial Pt black. Fe–PtBi 2 /Bi 2 O 2 CO 3 -NC may be applied as a promising alkaline anode catalyst for direct methanol fuel cells due to its outstanding structure and performance. The specific work provides a reference for designing reliable structures and selection of doping elements to enhance the sluggish kinetics of methanol electrooxidation.
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Journal of Materials Research and Technology-JMR&T
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2022
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IF 6.267
Jingwu Zheng,Siyuan Wang,Shuan Zhang,Wei Cai,Liang Qiao,Haibo Chen,Yao Ying,Wangchang Li,Jing Yu,Shenglei Che
In this paper, a corrosion-resistant glutamic acid (Glu)-Cu-Nano-Al 2 O 3 composite coating with both hydrophobicity and self-healing characteristics was electrodeposited on the sintered Nd-Fe-B surface. The influence of the amount of Nano-Al 2 O 3 added in the acidic Cu 2+ -glutamate (Glu 2− ) solution on the performance of the composite coating was studied, the results show that Nano-Al 2 O 3 inclusion can make the surface of the composite coating appear papillary particles and make the composite coating hydrophobic. By analyzing the products of the composite coating after corrosion in 3.5% NaCl solution, it is shown that the codeposition copper dihydroglutamate (CuGlu 2 H 2 ) and Glu particles in the composite coating are released and dissolved in the solution with pH = 6.5 after copper corrosion, and then complexed with Cu 2+ produced by corrosion to form an insoluble copper glutamate (CuGlu) passive film, which was deposited on the corroded coating to achieve self-repairing function and prevent further corrosion. The hydrophobicity and self-repairing function of the composite coating ensure that the sintered Nd-Fe-B has excellent corrosion resistance.
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