APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Fanqing Meng,Wei Ma,Chunying Duan,Xin Liu,Zhen Chen,Moyan Wang,Jian Gao,Zhe Zhang
Two dimensional transition metal dichalcogenides as potential catalysts to solve energy and environmental crises have caused significant research interests in recent years. In this work, edge-selectively Fe@3D-WS 2 nanoflowers with the abundant single-layer were efficiently prepared by dry ball milling for levofloxacin (LEVO) elimination. Together with the advantages of the single-layer active edges and the stretch of W S bond, the as-prepared Fe@3D-WS 2 showed the ultra-high degradation efficiency for LEVO under ball-milling condition. This high degradation activity was demonstrated to be originated from piezo-catalysis, rather than adsorption or thermocatalysis. In addition, the Fe@3D-WS 2 also showed an ultra-high reusability during the cyclic tests, which is due to its special “self-renewing” behavior under ball milling condition. The degradation efficiency of the Fe@3D-WS 2 still reached ˜ 99% after ten cyclic tests. Both oxygen radicals ( 1 O 2 , O 2 ·− ) and ·OH radicals were generated and took part in the LEVO degradation, while oxygen radicals were more contributed to the LEVO degradation. The present work not only provides an important insight for designing efficient catalysts, but also extends the possible application areas of ball milling technique.
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ELECTROCHIMICA ACTA
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2019
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IF 5.383
Yihui Wu,Ying Gao,Hanwei He,Ping Zhang
Low-cost and highly efficient electrocatalysts are highly desirable to improve the efficiency of water splitting for oxygen evolution. In this work, a self-supported ternary Ni–Fe–Sn film on three dimensional nickel foam, which is prepared through a simple electrodeposition method, is investigated as oxygen evolution reaction (OER) electrocatalyst. The Ni–Fe–Sn film displays a considerably low overpotential of 253 mV at a current density of 10 mA cm −2 and a small Tafel slope of 61.5 mV dec −1 and excellent long-term stability for OER in 30% KOH aqueous solution. The good OER performance of Ni–Fe–Sn film may originate from its high electrochemical active surface area, rapid electron/proton and mass transfers, and the close combination between Ni–Fe–Sn film and nickel foam. This work provides a guideline to develop the low-cost and efficient earth-abundant OER anodes.
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CHEMOSPHERE
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2018
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IF 4.427
Zhe Li,Shunqin Luo,Yang Yang,Jiawei Chen
Advanced oxidation processes (AOPs) are promising environmental remediation technologies for in-situ groundwater treatment . In this study, a bentonite supported Fe/Ni bimetallic nanoparticle (BNF) was fabricated for peroxymonosulfate (PMS) activation. The resultant BNF exhibited high catalytic activity for trichloroethylene (TCE) degradation in weak alkaline conditions. The conditions optimal for this activity were assessed in terms of peroxygen type and BNF/PMS dosage ratios. Complete degradation of 0.1 mM TCE was achieved in 25 min at pH = 8.2 when BNF was present at 1 g/L and PMS at 5 mM concentrations. Analysis of the underlying mechanisms indicated that SO 4 − has a dominant role whereas OH was rather trivial. The enhancement of catalytic activity was attributed to the strong oxidization of SO 4 − , dispersion of Fe/Ni nanoparticles and synergistic effects between Fe and Ni. The effects of inorganic anions, pH and temperature on the BNF/PMS activity were also investigated. Cl − and NO 3 − has little effect on TCE degradation, while PO 4 3− and HPO 4 2− were inhibitory. Higher temperatures favored PMS activation and BNF/PMS exhibited good catalytic activity across a wide range of solution pH. The results indicate that a novel BNF/PMS system holds promise as a superior AOP to remediate emerging organic pollutants in groundwater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Haibo Zhang,Jia Wen,Ying Fang,Siyu Zhang,Guangming Zeng
Hypothesis Modification of MIL-100(Fe) with ethanediamine (ED) is expected to improve the removal percentage of Pb(II) ions from aqueous solution. Nevertheless, the adsorption performance of ED-MIL-100(Fe) in natural waters will be affected by natural organic matter such as fulvic acids (FA). Hence, it is necessary to study the influence of FA on the physicochemical property, adsorption behavior and mechanisms of ED-MIL-100(Fe) towards the removal of Pb(II) from water. Experiments Batch adsorption experiments were conducted to compare adsorption capacity of MIL-100(Fe) and ED-MIL-100(Fe) for Pb(II). In addition, XRD , FTIR, SEM and XPS techniques were applied to investigate the characteristics, adsorption isotherms , and kinetics in the presence and absence of FA. Findings ED-MIL-100(Fe) enabled 99% removal of Pb(II) from water at or below 60 mg L −1 , whereas the MIL-100(Fe) hardly adsorbed any Pb(II). Additionally, the adsorption percentage of the Pb(II) ions (76%) outcompeted that of other metal ions (i.e. Co, Cu, Ni, Zn, and Cd) (each ≤ 25%) in the mixed solution. The negative surface charge of ED-MIL-100(Fe) was not affected by FA. Increasing FA concentration steadily increased the functional groups surrounding the ED-MIL-100(Fe) via electrical interaction, thus facilitating the Pb(II) ions adsorption.
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Energy Technology
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2019
·Vol. 8
·期 1
·1900896
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IF 3.163
Mengyao Lv,Fenghui Fan,Longhai Pan,Hangjia Shen,Erum Pervaiz,Jiacheng Wang,Minghui Yang,Jun Wang
Fabrication of an oxygen reduction reaction (ORR) catalyst is the key to an efficient and fast electrocatalytic process in a fuel cell for energy conversion. A reasonable strategy for the synthesis of electrocatalysts is one of the most promising ways for developing precious metal-free ORR catalysts. Herein, the synthesis of a highly active Fe 3 O 4 -based catalyst using a facile molten salts method is proposed. The electrocatalytic analysis shows superior ORR performance with an admirable half-wave potential ( E 1/2 = 0.83 V), comparable with the commercial 20 wt% Pt/C. In contrast, primary Zn–air battery, using synthesized Fe,S–N–C as an air-cathode, displays an open-circuit potential of 1.44 V and a high power density of 84.3 mW cm −2 .
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ACS Omega
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2019
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IF 2.584
Caidan Zhang,Haidong Li,Qiaozhen Yu,Lin Jia,Lynn Yuqin Wan
Electrospun nanofiber membrane (ENM) with huge specific surface area is an ideal solid substrate for sensors. However, only a few ENMs are developed into colorimetric sensors and it is even more challenging to fabricate multiple-ion-responsive ENM-based colorimetric sensor. In this study, benefiting from the excellent metal ion adsorption ability of poly(aspartic acid) (PASP) and high specific surface area of nanofibers, a reusable colorimetric sensor utilizing PASP electrospun nanofiber hydrogel membrane (ENHM) was designed to detect Cu2+ and Fe3+ in aqueous solution with simple filtration. The sensor based on PASP–ENHM exhibited high sensitivity and selectivity, and colorimetric responses for Cu2+ and Fe3+ detection could be observed by the naked eye. Upon exposure to Cu2+ aqueous solution, the color of the sensor changed from white to blue with a naked eye detection limit of 0.3 mg/L, while it turned from white to yellow with a detection limit of 0.1 mg/L for Fe3+ detection. Furthermore, this sensor was reusable after metal ion extraction by the desorption process.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Chong Xu,Yiqing Jiang,Jiahui Yang,Weimin Wu,Xing Qian,Linxi Hou
Box-structured nanomaterials with complicated surface texture, whose morphologies can be adjusted through changing mass ratios of reactants, are attractive in the field of electrochemical energy conversion. Herein, we report the shape-controllable synthesis of MoS 2 doped cobalt iron sulfide (Co-Fe-MoS x ) hollow nanoboxes with three different mass ratios of cobalt iron Prussian-blue-analog (Co-Fe PBA) nanocubes to (NH 4 ) 2 MoS 4 and their applications in dye-sensitized solar cells (DSSCs). As the increment of MoS 4 2− in system, the surface of Co-Fe-MoS x became rough with bushy embedded nanosheets. Benefiting from the three-dimensional nanostructure with more exposed edge sites and appropriate doped ratio, the Co-Fe-MoS x -2 hollow nanoboxes performed rough shells, well-defined interior voids, large specific surface areas and outstanding catalytic actives. By contrast, the sulfide of Co-Fe PBA (Co-Fe-S) and bare MoS 2 showed bad morphology and poor catalytic performance. It is notable that the DSSC with Co-Fe-MoS x -2 showed a much higher power conversion efficiency (PCE) of 9.63% than that of Pt based cell (8.23%) under AM 1.5G irradiation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Qian Peng,Yaobin Ding,Lihua Zhu,Guangli Zhang,Heqing Tang
A composite of Fe/Fe 3 C and N-doped graphitic carbon (Fe/Fe 3 [email protected] ) was prepared and used as a catalyst for the activation of peroxymonosulfate (PMS) toward the oxidative degradation of Norfloxacin (NOF). It was observed that Fe/Fe 3 [email protected] behaved as a bifunctional material, showing both good adsorption ability and catalytic activity. The maximum adsorption capacity of Fe/Fe 3 [email protected] for NOF was evaluated as 0.13 mmol g −1 . Under given conditions (NOF concentration 0.1 mmol L −1 , catalyst load 0.1 g L −1 and PMS addition 1 mmol L −1 ), the degradation of NOF was almost completely achieved in 20 min with a degradation rate constant of 0.22 min −1 . A non-radical mechanism was proposed for the activation of PMS by Fe/Fe 3 [email protected] by the scavenging test, EPR and chronoamperometry analysis. The fast and complete degradation of NOF was achieved via a rapid electron transform, in which both PMS and NOF molecular were adsorbed on the surface of Fe/Fe 3 [email protected] and PMS was activated by obtaining electrons from NOF to oxidize NOF. The present study provides a green bifunctional catalyst for the oxidative removal of organic pollutants in various environmental media.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 31
·31705-31717
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IF 2.8
Zheng Xiang,Wang Jinlin,Xue Xiaolong,Liu Wanxia,Kong Yadong,Cheng Rong,Yuan Donghai
In this research, the adsorptive removal of diclofenac sodium, one of the representative pharmaceuticals and personal care products, from aqueous solution using Fe 3 O 4 @MOF-100(Fe) magnetic microspheres was studied for the first time. The Fe 3 O 4 @MOF-100(Fe) microspheres exhibit strong magnetism and stability, which were observed as a core-shell structure. The maximum adsorption capacity of Fe 3 O 4 @MOF-100(Fe) for diclofenac sodium can reach 377.36 mg L −1 , which was higher than most of the adsorbents reported. The adsorption kinetics follows the pseudo-second-order kinetic equation. And the adsorption equilibrium of DCF can be described with Langmuir isotherm. In the cycle experiment, Fe 3 O 4 @MOF-100(Fe) material performed high adsorption efficiency for low-concentration diclofenac sodium solution, and the removal rate can still reach 80% after 5 cycles of adsorption without desorption. The mechanisms including electrostatic interaction, H-bond interaction, and π-π interaction that coexisted in the adsorption processes would be of benefit to enhance the adsorption capacity. The Fe 3 O 4 @MOF-100(Fe) magnetic microspheres offer exciting opportunities for further application.
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JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Xiaogeng Feng,Xiangjie Bo,Liping Guo
Rational synthesis and development of earth-abundant materials with efficient electrocatalytic activity and stability for water splitting is a critical but challenging step for sustainable energy application . Herein, a family of bimetal (CoFe, CoCu, CoNi) embedded nitrogen-doped carbon frameworks is developed through a facile and simple thermal conversion strategy of metal-doped zeolitic imidazolate frameworks. Thanks to collaborative superiorities of abundant M-N-C species, modulation action of secondary metal, cobalt-based electroactive phases, template effect of MOFs and unique porous structure , bimetal embedded nitrogen-doped carbon frameworks materials manifest good oxygen and hydrogen evolution catalytic activity . Especially, after modulating the species and molar ratio of metal sources, optimal Co 0.75 Fe 0.25 nitrogen-doped carbon framework catalyst just requires a low overpotential of 303 mV to achieve 10 mA cm −2 with a low Tafel slope (39.49 mV dec −1 ) for oxygen evolution reaction , which even surpasses that of commercial RuO 2 . In addition, the optimal catalyst can function as an efficient bifunctional electrocatalyst for overall water splitting with satisfying activity and stability. This development offers an attractive direction for the rational design and fabrication of porous carbon materials for electrochemical energy applications.
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ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Ping Zhang,Deyi Hou,David O’Connor,Xuanru Li,Simo Pehkonen,Rajender S. Varma,Xun Wang
Many challenges remain for the mass production of nanoparticles for the removal of contaminants from water, primarily due to the complexity of the synthetic protocols involved and the use of hazardous reagents. Although the development of phytosynthetic methods for the green fabrication of nanomaterials have seen keen interest, there remains much scope for improvement in terms of maximizing adsorption capacity and controlling the size of the nanoparticles produced. A green and sustainable pathway is described using Virginia creeper (Parthenocissus quinquefolia) leaf extract in the presence of oxalic acid for the synthesis of earth abundant Fe,Cu-based nanoparticle adsorbents. This optimized green method could produce Fe,Cu-based nanoparticles with a remarkably high maximum adsorptive capacity (1399 mg g–1) for aqueous Malachite Green (MG) removal. Furthermore, various particle sizes (between 160 and 1000 nm) were attained by simply varying the amount of oxalic acid. The synthesized adsorbent displayed other excellent characteristics, including (i) maintaining a high adsorption capacity over a wide range of pH conditions, (ii) remaining chemically stable under an ambient storage environment, and (iii) having good recycling potential, with consistent removal efficiency observed over four adsorption/desorption cycles. This work not only promotes the use of natural, earth-abundant, and renewable resources in synthesizing novel and efficient absorbents but also provides a simple, convenient, and cost-effective strategy for the purification of dye-laden wastewater.
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GEOCHIMICA ET COSMOCHIMICA ACTA
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2018
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IF 4.69
Songhu Yuan,Xixiang Liu,Wenjuan Liao,Peng Zhang,Xiaoming Wang,Man Tong
Production of hydroxyl radicals ( OH) has been recently revealed upon oxygenation of sediments in redox-dynamic subsurface environments. In particular, Fe(II)-bearing clay minerals are the major sediment components contributing to OH production upon oxygenation, and the produced OH can oxidize contaminants and inactivate bacteria. Whereas, the mechanisms of OH production from oxygenation of Fe(II)-bearing clay minerals remain elusive. The objectives of this study were to identify the structural variation of Fe(II) entities during the oxidation of Fe(II)-bearing clay minerals by O 2 , and to unravel the mechanisms of electron transfer within the mineral structure and from mineral to O 2 for OH production. Nontronite (NAu-2, 23% Fe) which was chemically reduced to 54.5% Fe(II) in total Fe was used as a model Fe(II)-bearing clay mineral. Production of OH and oxidation of Fe(II) were measured during the oxidation of reduced NAu-2 by O 2 . A wide spectrum of spectroscopic techniques, including Fourier transform infrared spectroscopy (FTIR), Fe K-edge X-ray absorption spectroscopy (XAS), Mössbauer spectra, and X-ray photoelectron spectroscopy (XPS), were employed to explore the structural variation of Fe(II) entities in NAu-2 and the electron transfer within NAu-2 and from NAu-2 to O 2 . For 180 min oxidation of 1 g/L reduced NAu-2, a biphasic OH production was observed, being quick within the initial 15 min and slow afterwards. Production of OH correlates well with oxidation of Fe(II) in the reduced NAu-2. Within the initial 15 min, trioctahedral Fe(II)-Fe(II)-Fe(II) entities and edge Fe(II) in the reduced NAu-2 were preferentially and quickly oxidized, and electrons from the interior Fe(II)-Fe(II)-Fe(II) entities were most likely ejected from the basal siloxane plane to O 2 . Meanwhile, trioctahedral Fe(II)-Fe(II)-Fe(II) entities were mainly transformed to dioctahedral Fe(II)-Fe(II) entities. When the time of oxygenation was longer than 15 min, dioctahedral Al-Fe(II), Fe(II)-Fe(II) and Fe(II)-Fe(III) entities were slowly oxidized, and the interior electrons were transported through Fe(II)-O-Fe(III) linkages to edges and then ejected to O 2 . In the slow stage of oxidation, electrons from interior Fe(II) accumulated towards the near surface layers and fueled the regeneration of edge Fe(II) for OH production. In both stages, one-electron transfer mechanism with the involvement of O 2 − and H 2 O 2 applies for OH production from the oxidation of structural Fe(II) by O 2 . The mechanisms unraveled in this study advance the understanding of reactive oxygen species (ROS) production and structural Fe variation when Fe(II)-bearing clay minerals are oxygenated in redox-dynamic systems.
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