INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Jiajia Zheng,Xinsheng He,Yancheng Li,Biao Zhao,Fengchao Ye,Chunfu Gao,Mengjia Li,Xiping Li,Shiju E
A flaky Fe-based mangetorheological elastomer film (F-Fe/MREF) composite was developed through mixing micron-sized flaky Fe particles into a silicone rubber (SR) matrix by compression molding and vulcanization. The 28 wt % F-Fe/MREF with a thickness of 4.3 mm displays dual resonance peaks with an optimal reflection loss (RL) value of −53.3 dB at 4.8 GHz and an effective frequency bandwidth (RL < −10 dB) reaches 6.0 GHz. Furthermore, anisotropic F-Fe/MREF obtained by assistance of an external magnetic field demonstrates an effective bandwidth of 12.5 GHz in one thickness. This is attributed to the synergistic contributions from magnetic loss and dielectric loss and good impedance matching along with promotion of multiple reflections and scatterings. Besides, an MR effect of 39.2% was obtained for anisotropy F-Fe/MREF because of interaction enhancement between F-Fe particles and the cross-linked matrix. These results suggest that the F-Fe/MREF composites could serve as a potential candidate toward applications of electromagnetic wave absorbing.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 33
·17174-17184
·
IF 11.301
Jianwei Fan,Xufei Niu,Wei Teng,Peng Zhang,Wei-xian Zhang,Dongyuan Zhao
Catalytic oxidation of formaldehyde (HCHO) is regarded as a promising strategy to eliminate this indoor air pollutant. The design of a highly active and cost-effective catalyst is still pivotal to improve the performance for HCHO oxidation. Herein, we report an Fe–Ce–O solid solution catalyst supported on ordered mesoporous silica (SBA-15) prepared by simple two-step impregnation–calcination, achieving highly efficient HCHO elimination at a low temperature. This strategy brings about the formation of small solid solution nanoparticles (7–12.9 nm) with good dispersion in confined spaces. Meanwhile, the catalysts possess large surface areas (∼500 m2 g−1) and pore volumes (0.5 cm3 g−1) with a pore size of ∼7.5 nm. The results show that Fe content and calcination temperature have great effects on the generation of oxygen vacancies in the catalyst, and further on the catalytic performance. The 20% FeOx-CeOx/SBA-15-350 catalyst displays superior catalytic activity with 65% and 94.9% conversion at 30 °C and 60 °C with a low concentration of HCHO (9.8 μg L−1), respectively, comparable to that for many reported precious metal catalysts. The high ratio of Ce3+ due to the formation of an Fe–Ce–O solid solution and highly dispersed active sites by the spatial confinement is favorable for more oxygen vacancy generation, which mainly contributes to the excellent performance. This work opens up an avenue to design highly efficient non-noble metal nanocatalysts for volatile organic compound (VOC) elimination.
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NANOTECHNOLOGY
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2020
·Vol. 31
·期 13
·135403
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IF 3.551
Taowen Dong,Ting Deng,Xianyu Chu,Tingting Qin,Haoxiang Wang,Zizhun Wang,Wei Zhang,Weitao Zheng
Earth-abundant Fe2O3 is a promising material for the negative electrode of supercapacitors by virtue of its wide potential windows. However, the unsatisfactory electrical conductivity and poor ionic diffusion rate within Fe2O3 results in degraded electrochemical performance. In this work, to address these issues, we demonstrate an easy method to synthesize Fe-based zeolitic imidazolate framework (Fe–ZIF) derived α–Fe2O3@C with remarkable supercapacitive properties. The as-obtained α–Fe2O3@C electrode, with the particular benefit of dispersed distribution of carbon, enabling fast electrochemical response, presents a prospective specific capacitance of 161 Fg−1 at a current density of 1 Ag−1. Furthermore, by using the α–Fe2O3@C architecture as the negative electrode, we fabricated a supercapacitor with Na0.5MnO2 as the positive electrode. Our supercapacitor shows a high energy density of 25 Whkg−1, while the corresponding power density is 2400 Wkg−1 at a current density of 2 Ag−1.
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Emergent Materials
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2020
·Vol. 3
·期 3
·307-313
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IF 0
Han Yu,Yue Dongting,Zhao Yixin,Qian Xufang
The nano-Fe(0)/mesoporous carbon supported on biochar (MCFe/BC) was synthesized by a co-assembly process followed with carbon thermal reduction method. The specific surface area of MCFe/BC was 582.0 m 2 /g. The highest removal efficiency of pyrene in sand can reach about 40% after 7 h duration on MCFe6.2/BC with 6.2 wt% of iron by the peroxydisulfate advanced oxidation process (PDS-AOP). The removal efficiency of pyrene by adsorption at pH values varied from 4 to 10 in 24 h is around 40%, which shows that adsorption is independent with the pH values, while PDS-AOP is pH dependent, which is more efficient in acidic and basic conditions. The graphitic structure and oxygen-containing groups of carbon materials are benefit for adsorption of PAH. The presence of Nano-Fe(0) is responsible for the activation of peroxydisulfate especially at acidic condition. Our results indicate the potential of PDS-AOP using zero valent iron/porous biochar composite as the activator in practical soil remediation.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Hejun Ren,Xiong Jin,Chenguang Li,Tingting Li,Yang Liu,Rui Zhou
In this study, we reported that the presence of rosemary acid (RA) could strongly enhance the Fe(III)-mediated Fenton oxidation of 2,4-DCP as the model contaminant at near neutral pH. This enhancement was verified by the strong chelating and reducing ability of RA, which could prevent ion precipitation and accelerate the Fe 3+ /Fe 2+ cycle. Radical quenching experiments and electron paramagnetic resonance confirmed the existence and roles of hydroxyl radicals in the Fe 3+ /RA/H 2 O 2 system. Lot size optimized experiments were executed to achieve efficient 2,4-DCP degradation (99.93%) under the optimum conditions of 100 μmol/L Fe 3+ , 100 μmol l/L RA and 8 mmol/L H 2 O 2 within 60 min. In addition, co-existing metal ions , inorganic anions and natural organic matters were proved that they could inhibit removal efficiency and rate at varying degrees. Total organic carbon and chloride ion measurements were employed to probe the mineralization of organic matters (including RA and 2,4-DCP). This study provides a new modified Fenton system to enhance the oxidation removal of refractory organics in water and will enrich the understanding on effective H 2 O 2 activation at neutral pH.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 31
·15252-15262
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IF 3.553
Jiang Xiaoli,He Miao,Tang Mengyi,Zheng Qiaoji,Xu Chenggang,Lin Dunmin
Electrocatalytic nitrogen reduction reaction (NRR) under ambient conditions has been considered as a promising approach for green ammonia synthesis; however, non-precious metal-based catalysts with excellent NRR electrocatalytic performance have been scarce. Herein, self-supported bimetallic electrocatalysts of Ni 12 P 5 /FeP 4 nanoplates grown on carbon cloth were synthesized by a combined process of hydrothermal technology and low-temperature phosphidation. The catalyst exhibits excellent electrocatalytic N 2 fixation performance with a high NH 3 yield rate of 3.08 × 10 −10 mol s −1 cm −2 (16.40 μg h −1 mg −1 cat
), Faradaic efficiency (39.9%) as well good durability at − 0.1 V in 0.1 M Na 2 SO 4 at ambient conditions, which are attributed to the distinctive nanostructure and rational composition. Our study paves the way for expanding the scope of NRR research and designing more efficient electrochemical ammonia synthesis in the future.
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CATALYSIS TODAY
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2020
·
IF 5.825
Fei Yuan,Guanghui Zhang,Jie Zhu,Fanshu Ding,Anfeng Zhang,Chunshan Song,Xinwen Guo
Direct conversion of carbon dioxide (CO 2 ) into lower olefins (C 2 -C 4 = ) is highly attractive as a sustainable production route for its great significance in greenhouse gas emission control and fossil fuel substitution. Fe-based catalysts have been extensively studied in CO 2 hydrogenation, which usually show unsatisfactory selectivity toward lower olefins. Here we present a high-dispersion catalyst precursor CoFe 2 O 4 with Na (Na-CoFe 2 O 4 ) that offers C 2 -C 4 = space time yield as high as 2.88 μmol C2-C4= g cat −1 s -1 and olefin to paraffin ratio about 6 at CO 2 conversion higher than 41 %. High dispersion and the intimate contact between Fe and Co sites help inhibit the formation of methane, and favor a higher selectivity of C 2 + hydrocarbons, especially lower olefins. The presence of Na further promotes chain growth and suppresses the direct hydrogenation of Fe-(CH 2 ) n intermediates. A superior stability over 100 h was observed, demonstrating the promising potential of this catalyst for industrial applications.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
·
IF 4.551
Tao Jiang,Weiling Luan,Yufeng Ren,Chenyao Fan,Qi Feng,Lyudmila Turyanska
Exploring an economical and efficient oxygen reduction reaction (ORR) is an essential but challenging field of study. Metal–organic frameworks (MOFs) have emerged as promising candidates for the preparation of porous catalysts. Here we propose a synergistic heat treatment (SHT) method to synthesize Fe–N–C-SHT catalyst with hierarchical porous hollow structures via a simple carbonization method by the synergistic heating of ZIF-8-Fe (ZIF-8 doped with Fe) and ZIF-67 in a tube furnace. Fe–N–C-SHT catalyst displays efficient ORR activity (half-wave potential ( E half ) = 0.88 V versus reversible hydrogen electrode (RHE) with a loading of 0.204 mg Fe-N-C-SHT cm −2 ), which is superior to that of Fe–N–C synthesized using individual heat treatment (IHT) ( E half = 0.84 V) and Pt/C catalyst ( E half = 0.86 V). We achieve enhanced catalytic properties, enhanced methanol tolerance, and long-term durability of the Fe–N–C-SHT catalyst in alkaline electrolyte . The improved ORR activity is attributed to the synergistic effect of Fe doping and optimized SHT methodology, which led to the formation of a highly porous catalyst with numerous active sites. The developed SHT method presents a novel route to fabricate Fe–N–C catalysts with hollow-mesoporous-microporous structures and high performance in ORR.
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LUMINESCENCE
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2020
·Vol. 35
·期 8
·1350-1359
·
IF 1.855
Liu Zhang,Yue Hou,Xiaoyan Guo,Wei Liu,Congcong Lv,Chunyang Zhang,Yan Jin,Baoxin Li
In this study, three types of Fe(III) bipyridyl or phenanthroline (Fe(III)-L 3 ) complex could directly catalyze 3,3′,5,5′-tetramethylbenzidine (TMB) to induce blue chromogenic changes without H 2 O 2 . Fe(III)-L 3 complex could induce a colour change in TMB directly after a short incubation time. Due to the high oxidase-like activity of the Fe(III)-L 3 complexes, superoxide anion radicals (O 2 •– ) were formed in solution. Intermediates radical involving oxo-iron species were then produced that oxidized TMB to its oxidation products (oxTMB), which had an absorbance maximum at 652 nm. Glutathione (GSH) could inhibit the oxidation reaction of the Fe(III)-L 3 complex–TMB system, a rapidly colorimetric method was established for the specific detection of GSH that had a detection limit of 0.1 μM. Furthermore, Fe(III)-L 3 complexes could catalyze TMB to oxTMB directly without H 2 O 2 . This fast and simple colorimetric method may open a new avenue for application in the point-of-care diagnosis field using the TMB chromogenic system.
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ANALYTICA CHIMICA ACTA
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2020
·
IF 5.977
Fa-Ting Xie,Xiao-Lan Zhao,Kuan-Neng Chi,Tong Yang,Rong Hu,Yun-Hui Yang
A ratiometric electrochemical aptasensor is proposed for the detection of thrombin. In the sensor, the iron metal-organic frameworks (Fe MOFs)-labeled aptamer as signal tags was used as signal probe (SP), and the electrolyte solution [Fe(CN) 6 ] 3-/4- was utilized as an inner reference probe (IR). In the presence of thrombin, the signal of Fe-MOFs can be detected. Meanwhile, the signal of [Fe(CN) 6 ] 3-/4 -IR almost remains stable. Accordingly, thrombin concentration can be monitored with the ratio response of I Fe-MOFs-SP /I [Fe(CN)6] 3-/4- -IR . The proposed ratiometric biosensor owns a strong ability to eliminate the disturbance that arises from different DNA loading densities, environmental impact and instrumental efficiency. DNA nanotetrahedron (NTH) with three-dimensional (3D) scaffold can effectively eliminate nonspecific adsorption of DNA and protein. The accessibility of target molecules and loading amounts of signal substances could be increased because of the enhanced mechanical rigidity of well-designed 3D NTH. Thus, detection reproducibility and sensitivity can be further improved. Moreover, the biosensor only requires conjugation with one electroactive substance. The modification procedure can be greatly simplified. The biosensor owns high sensitivity with the detection limit of 59.6 fM. We expect that it will emerge as a generalized ratiometric sensor that may be useful for detecting target analytes .
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qing Cheng,Wulin Yang,Qingling Chen,Jiajun Zhu,Deyi Li,Licai Fu,Lingping Zhou
Maintaining a highly negative value of conduction band (CB) potential of photocatalysts through metal doping has been a great challenge. Herein, we investigated the effects of Fe-doping on the crystal structures and electronic structures of zirconia (ZrO 2 ) in detail by combining experiments and Density Functional Theory (DFT). It was revealed that the Fe-doping obviously triggered the formation of tetragonal phase ZrO 2 and induced a defect states in the bandgap of Fe-doped ZrO 2 . Due to the coherent effect between the electrons of the Fe 3 d orbitals and ZrO 2 intrinsic electronic states, the defect states expanded the light absorption edge of ZrO 2 and Fe-doped ZrO 2 showed a small bandgap with maintaining a highly negative value of the CB potential. Meanwhile, Fe-doping significantly enhanced photoelectrochemical properties, the efficiency separation of electron-hole pairs and photocatalytic activity in comparison with the pristine ZrO 2 . We also found that 0.5%Fe-ZrO 2 exhibited the optimum photocatalytic performance, and reached 96% for degradation of Rhodamine B (RhB) within 150 min under visible light irradiation. This work elucidated the mechanism of the photocatalytic degradation of RhB over Fe-doped ZrO 2 and provided a promising approach in designing highly negative CB potential of ZrO 2 via Fe doping toward sustainable environmental remediation.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Xiang Li,Yan Jia,Minghua Zhou,Xianfa Su,Jianhui Sun
In this study, the Fe, N co-doped biochar (Fe-N-BC) was prepared by pyrolyzing wheat straw, urea and iron salts and used to activate persulfate (peroxydisulfate, PS) for organic contaminant degradation. Iron oxide doping not only introduced magnetism into the biochar for easy separation, but also influenced its catalytic ability for PS activation. In the Fe-N-BC/PS system, almost all acid orange (AO7) was removed within 90 min with an apparent rate constant ( k obs ) of 0.114 min −1 , which was almost 37 times larger than that of pure N-BC (0.003 min −1 ). Factors influencing the removal of AO7 were investigated, including PS concentration, catalyst dosage, and initial pH. The Fe-N-BC/PS system had high removal efficiencies for various organic contaminants and showed high resistance to inorganic anions in aquatic environments. The radical quenching studies, electron paramagnetic resonance (EPR) measurements, and electrochemical analyses verified that the mechanism of AO7 degradation in the Fe-N-BC/PS system included both radical and non-radical pathways involving the generation of OH, SO 4 − , O 2 − , 1 O 2 , and electron transfer. Additionally, persistent free radicals (PFRs) on the catalysts also related to their catalytic efficiencies. These results demonstrated that the Fe-N-BC/PS system had the potential for wastewater treatment applications.
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