JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 5
·2831-2839
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IF 1.938
Nie Jiajin,Li Zhitong,Shi Guifei,Wang Jing,Yao Shaowei
Fe-zeolitic imidazolate framework (ZIF)@C (Fe-ZIF wrapped by carbon) anode material has been manufactured. It has porous nanostructure, which can effectively shorten the distance of lithium ion transmission, thus achieving excellent rate performance, and can also reduce the volume expansion in the charging and discharging process, thus reducing the attenuation of capacity. The external carbon coating avoids direct contact between Fe-ZIF and the electrolyte, inhibits decomposition of the electrolyte, and impedes formation of the solid electrolyte interphase (SEI) film, thus obtaining higher reversible capacity in the cycling process. At a current density of 100 mA/g, Fe-ZIF@C achieves a high discharge capacity of 719 mAh/g after 100 cycles. This research shows that Fe-ZIF@C has potential for use as an anode material for lithium-ion batteries.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Huan Yang,Shuai Hu,Hui Zhao,Xiaofei Luo,Yi Liu,Chengfei Deng,Yulan Yu,Tianding Hu,Shaoyun Shan,Yunfei Zhi,Hongying Su,Lihong Jiang
Efficient removal of antibiotics from aqueous solution is of fundamental importance due to the increasingly severe antibiotic-related pollution. Herein, a high-performance Fe-ZIF-8-500 adsorbent was synthesized by Fe-doping strategy and subsequent activation with high-temperature. In order to evaluate the feasibility of Fe-ZIF-8-500 as an adsorbent for tetracycline (TC) removal, the adsorption properties of Fe-ZIF-8-500 were systematically explored. The results showed that the Fe-ZIF-8-500 exhibited ultrahigh adsorption capacity for TC with a record-high value of 867 mg g -1 . Additionally, the adsorption kinetics and isotherms for TC onto the Fe-ZIF-8-500 can be well-fitted by the pseudo-second-order kinetics model and the Freundlich model, respectively. The ultrahigh adsorption capacity of Fe-ZIF-8-500 can be explained by the synergistic effect of multi-affinities, i.e., surface complexation, electrostatic attraction, π-π interaction and hydrogen bonding. After being used for four cycles the adsorption capacity of Fe-ZIF-8-500 remains a high level, demonstrating its outstanding reusability. The ultrahigh adsorption capacity, excellent reusability, satisfactory water stability and easy-preparation nature of Fe-ZIF-8-500 highlight its bright prospect for removing tetracycline pollutant from wastewater.
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ADVANCES IN ATMOSPHERIC SCIENCES
·
2021
·Vol. 38
·期 7
·1252-1263
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IF 3.158
Wang Yu,Zhao Jie,Liu Huihui,Li Yuan,Dong Wenbo,Wu Yanlin
Iron and oxalic acids are widely distributed in the atmosphere and easily form ferric oxalate complex (Fe(III)-Ox). The tropospheric aqueous-phase could provide a medium to enable the photo-Fenton reaction with Fe(III)-Ox under solar irradiation. Although the photolysis mechanisms of Fe(III)-Ox have been investigated extensively, information about the oxidation of volatile organic compounds (VOC), specifically the potential for Secondary Organic Aerosol (SOA) formation in the Fe(III)-Ox system, is lacking. In this study, a ubiquitous VOC methacrolein (MACR) is chosen as a model VOC, and the oxidation of MACR with Fe(III)-Ox is investigated under typical atmospheric water conditions. The effects of oxalate concentration, Fe(III) concentration, MACR concentration, and pH on the oxidation of MACR are studied in detail. Results show that the oxidation rate of MACR greatly accelerates in the presence of oxalate when compared with only Fe(III). The oxidation rate of MACR also accelerates with increasing concentration of oxalate. The effect of Fe(III) is found to be more complicated. The oxidation rate of MACR first increases and then decreases with increasing Fe(III) concentration. The oxidation rate of MACR increases monotonically with decreasing pH in the common atmospheric water pH range or with decreasing MACR concentration. The production of ferrous and hydrogen peroxide, pH, and aqueous absorbance are monitored throughout the reaction process. The quenching experiments verify that · OH and \(O_2^{\bar .}\) are both responsible for the oxidation of MACR. MACR is found to rapidly oxidize into small organic acids with higher boiling points and oligomers with higher molecular weight, which contributes to the yield of SOA. These results suggest that Fe(III)-Ox plays an important role in atmospheric oxidation.
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ENVIRONMENTAL RESEARCH
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2020
·
IF 5.715
Zhuo Shen,Lingling Fan,Shangkun Yang,Yuyuan Yao,Haixiang Chen,Wentao Wang
The Fenton-like process has been regarded as a clean and efficient approach to generate reactive oxygen species (ROS) to deal with the ever-growing environmental pollution . However, developing improved catalysts with adequate activity and stability remains a long-term goal for practical application. Herein, crystalline carbon nanotubes (CNTs) interconnected Fe/Fe 3 C-doped nanoporous carbonitride (Fe-NC) was easily prepared by the pyrolysis of ZIF-8 confined with Fe 3+ . The obtained Fe–NCs possessed high degrees of graphitic carbon and nitrogen. Such Fe–NCs can enhance the activation of peroxymonosulfate (PMS) for the removal of multiple organic contaminants . The optimized Fe-NC/PMS system exhibited impressive catalytic performance, with a TOF as high as 4.43 min −1 for 3BF degradation, and the removal efficiency of other dyes, phenols and antibiotics was up to 96.2% within 10 min. The removal efficiency of 3BF was 93.4% within 10 min with extremely low iron ions leaching (<0.052 mg/L) even after five cycles. In addition, the effects of pH on the catalytic performance demonstrated that the decomposition of 3BF exceeded 95.6% even when the initial pH varied from 5 to 10. We confirmed that SO 4 - , OH, O 2 - and 1 O 2 were generated in the catalytic system of Fe-NC/PMS, which played a critical role in degrading the organics. These findings provide new insights into the design of environmental-friendly Fenton-like catalysts with high efficiency and favorable stability in environmental remediation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Meizhu Chen,Jia An,Yongqin Hu,Rubing Chen,Ying Lyu,Nan Hu,Mengfei Luo,Mengdi Yuan,Yufei Liu
Perovskite materials have shown great potential in various fields, such as photovoltaic devices, biomedical applications, and fluorescent probes. However, their hypersensitivity has significantly limited their practical application. In this paper, a modified swelling-shrinking strategy was adopted to encapsulate CsPbBr 3 perovskite quantum dots into poly(styrene/acrylamide) nanospheres, in order to create novel hyperstatic and hydrophilic perovskite polymer fluorescent beads. The results show that the fluorescence characteristics did not noticeably change when the polymer materials were dispersed in an aqueous solution over 12 months. Under harsher conditions (acid, alkali, PBS, DMEM, temperature), the novel perovskite polymers showed unprecedented fluorescence stability, which was then applied to the selective sensing of Fe(III) in real samples. The results show that a good linear relationship between 5 and 150 μM was obtained under optimal conditions, and the limit of detection was approximately 2.2 μM. Furthermore, the Fe(III)-sensing applications in Yangtze River water, human serum and tea water has been proven with satisfying results.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xiao-Cheng Liu,Chuan-Shu He,Zi-Yang Shen,Wen-Qiang Li,Ning Chen,Jun-Sheng Song,Xiao-Guo Zhou,Yang Mu
Fe(III) chelate reduction is of great importance in the homogeneous neutral electro-Fenton (EF) process, but its reduction mechanisms with different reductive species remain unclear. In this study, the reduction mechanisms of several typical Fe(III) chelates through electron and atomic H* were investigated using experiments and density functional theory calculations. The results indicated that the electron reduction efficiencies for [Fe(III)-EDTA] − and [Fe(III)-EDDS] − chelates were 16.23 and 8.31 times higher compared to [Fe(H 2 O) 6 ] 3+ , which was featured by low E LUMO - HOMO and concentrated LUMO distribution around Fe atom. In contrast, the atomic H* reduction efficiency for [Fe(III)-HA] 3+ chelate was 10 times higher than that of electron, attributed to high chelation ability of HA and negative energy barrier of [Fe(III)-HA] 3+ reduction in the atomic H*-dominated system. Additionally, phthalocyanine (Pc) had insignificant effect on pollutant degradation efficiency in the neutral EF systems due to the lower chelate ability of Pc with Fe(III) compared to H 2 O.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xianshu Qiao,Hongjun Kang,Yang Li,Kai Cui,Xin Jia,Henghao Liu,Wei Qin,Max Pupucevski,Gang Wu
We report a highly efficient and stable electrode composed of a porous Fe-doped β-nickel hydroxide nanopyramid array supported on nickel foam (U–Fe-β-Ni(OH)2/NF) for overall water splitting. The unique structure is assembled via a self-templated strategy by utilizing the FeNi oxalate (FeNi–C2O4/NF) nanopyramid as the templates, followed by an anion-exchange reaction at room temperature. Due to the intrinsic activity of Fe-doped β-Ni(OH)2 along with unique porous array structures consisting of two-dimensional (2D) active materials on three-dimensional (3D) conductive substrates, the developed electrode exhibited outstanding electrocatalytic activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline medium. The introduced amount of Fe plays a significant role in promoting OER and HER activity compared to the β-Ni(OH)2 electrode. The optimal electrode (U–Fe-β-Ni(OH)2/NF-2) generated a current density of 10 mA cm–2 at low overpotentials of 218 mV for the OER and 121 mV for the HER. The electrode also demonstrated considerably stable performance during the continuous water splitting process. Furthermore, we elucidated the promotion mechanisms of the active Fe-doped β-Ni(OH)2 compound for the OER and HER based on extensive characterization and electrochemical measurements. Hence, this work provides a facile approach to developing low-cost, efficient, and stable hydroxide-based electrodes for bifunctional OER and HER in water splitting.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Dairui Xie,Hongcheng Zhang,Meng Jiang,Hao Huang,Heng Zhang,Yang Liao,Shilin Zhao
Humic acid (HA) was carbonized at 300, 400 and 500 °C and then functionalized with 1 wt%–12 wt% Fe(III) respectively [CHA300/400/500-Fe(III)]. Adsorption of such Fe(III)-functionalized carbonized HA as adsorbents to aqueous tetracycline (TC: 25 mg·L −1 ) was studied. The adsorption equilibrium time for CHA400-Fe(III) to TC was 6 h faster and the adsorption removal efficiency ( R e ) was two times higher than that of HA/CHA. The adsorption R e of CHA400-Fe(III) loaded 10% iron [CHA400-(10%)Fe(III)] to TC could reach 99.8% at 8 h and still kept 80.6% after 8 cycles. The adsorption kinetics were well fitted to the pseudo-second-order equation and the adsorption isotherms could be well delineated via Langmuir equations( R 2 > 0.99), indicating that the homogeneous chemical adsorption of TC occurred on the adsorbents. The main adsorption mechanisms of TC were complexation Fe(III) and hydrophobic distribution. Electropositive and electronegative repulsion between TC and CHA400-(10%)Fe(III) at lowly pH(2) and highly pH(8–10) respectively, leaded to the relatively low adsorption capacity and more notable influence of ion concentration. When the pH was between 4 and 8, TC mainly existed in neutral molecules (TCH 2 ), so the influence of ion concentration was not obvious. The dynamic adsorption results showed that the CHA400-(10%)Fe(III) could continuously treat about 2.4 L TC(27 mg·L −1 ) wastewater with the effluent concentration as low as 0.068 mg·L −1 . Our study suggested a broad application prospect of a new, effective, low-cost and environment-friendly adsorbent CHA400-(10%)Fe(III) for treatment of low-concentration TC polluted wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Lei Liu,Huan Liu,Xingwei Sun,Chunping Li,Jie Bai
Transition metal iron-based catalysts are promising electrocatalysts for oxygen reduction reaction (ORR), and they have the potential to replace noble metal catalysts . The one-dimensional of carbon nanofibers with tubular structure can effectively promote the electrocatalytic activity , which facilitates electron transport . Herein, the Pt–Fe/CNFs were synthesized by electrospinning and subsequent calcination . Benefiting from the advantages of one-dimensional structure, Pt–Fe/CNFs-900 with fast electrochemical kinetics and excellent stability for ORR with excellent onset of 0.99 V, a low Tafel slope of 62 mV dec −1 and high limiting current density of 6.00 mA cm −2 . Long-term ORR testing indicated that the durability of this catalyst was superior to that of commercial Pt/C in alkaline electrolyte . According to RRDE test, the ORR reaction process of Pt–Fe/CNFs-900 was close to four-electron transfer routes.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·11970-11983
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IF 3.553
Niu Yingchun,Li Xueai,Dong Wenqi,Zhang Can,Zhao Kuihu,Wang Fengyan,Wang Haiyan
Carbon and iron composites have drawn much attention for their unique electromagnetic properties. In addition, nitrogen doping of carbon can effectively modulate the dielectric properties of carbon. Therefore, synthesis of N-doped carbon and iron composites is an alternative method for obtaining high-efficiency microwave absorption materials. In previous studies, the synthesis process was very complicated including multistep routes. In this work, N-doped carbon with embedded Fe/Fe 3 C was synthesized in-situ via pyrolysis of amino phenol formaldehyde resin (APF) scattered with Fe 2 O 3 nanoparticles (APF/Fe 2 O 3 ), which was obtained through a simple hydrothermal process. During the heat-treatment process, the APF resin was converted into N-doped carbon, and simultaneously, the Fe 2 O 3 was reduced to iron nanoparticles. Then, inevitably, the iron nanoparticles reacted with carbon to form Fe 3 C at the interface between the iron particles and carbon. Taking advantage of multiple heterogenous interface, the interfacial polarization relaxation could be enhanced. Therefore, the N-doped carbon with embedded Fe/Fe 3 C particles displays microwave absorption with a maximum reflection loss of − 70 dB. Moreover, the effective absorption bandwidth (reflection loss of less than − 10 dB) reaches 6.02 GHz at a thickness of 2.13 mm. This study not only provides composites of N-doped carbon with embedded Fe/Fe 3 C particles with excellent stable microwave absorption but also offers a simple method for synthesizing N-doped carbon with embedded Fe/Fe 3 C particles.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Fang Liu,Weiyang Jin,Ying Li,Lekai Zheng,Yongchuan Hu,Xuewen Xu,Yanming Xue,Chengchun Tang,Hui Liu,Jun Zhang
The development of efficient non-precious metal catalysts to accelerate the oxygen evolution reaction (OER) kinetics is important for the development of water-derived hydrogen fuel. Iron-cobalt oxide ((Co, Fe) 3 O 4 ) is one of the most promising transition metal-based OER electrocatalysts under alkaline conditions, but its activity is unsatisfactory due to its limited active sites and poor electronic conductivity. Herein, self-supported (Co, Fe) 3 O 4 hierarchical nanosheet arrays with massive oxygen vacancies (denoted as V O -(Co, Fe) 3 O 4 /CC) are synthesized by a simple reduction method at room temperature. Oxygen vacancies can regulate the ratio of Co 2+ /Co 3+ , which leads to the modification of its electronic properties, and it also significantly improves the charge transfer ability and accelerates the reaction. Meanwhile, the unique hierarchical nanosheet arrays structure and abundant oxygen vacancies effectively adjust the number of OER active sites, which has a key role in developing a cost-effective oxygen electrode. Accordingly, V O -(Co, Fe) 3 O 4 /CC exhibits a relatively low overpotential of 286 mV at 10 mA cm −2 and a low Tafel slope of 41 mV dec −1 .
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Journal of Chemistry
·
2020
·
IF 1.79
Xiaofang Liu,Zhigang Liu,Qiuyun Zhang,Hongguo Wu,Rui Wang
MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.
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