CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Junlei Zhang,Wei Zhao,Zhi Li,Gang Lu,Mingshan Zhu
Advanced oxidation processes involving the visible-light-assisted peroxymonosulfate (PMS) are emerging as promising approaches for treating antibiotic pollutants. Here, Fe(II)/V(IV) self-doped FeVO 4 nanobelts were synthesized and employed to build a visible-light-assisted PMS activation system for degrading antibiotic sulfamethoxazole (SMX). Compared with PMS/FeVO 4 , PMS/Visible light (VL), or PMS system, the PMS/FeVO 4 /VL system showed 3.9, 14.0, or 14.1 times improved for the removal of SMX, respectively. The reason behind this is the organic combination of the VL photocatalysis and transformation of Fe(II)/V(IV) to Fe(III)/V(V) over FeVO 4 , namely when photocatalytic behavior over FeVO 4 can produce electrons (e - ) and holes (h + ) to activate PMS or directly degrade SMX, the transformation of Fe(II)/V(IV) to Fe(III)/V(V) will also happen to donate some e - for PMS activation simultaneously. Such a system can also effectively remove SMX from actual water bodies such as medicine wastewater, river water, tap water, and rainwater. This work not only provides an effective system for treating SMX polluted wastewater, but also gives some new insights to understanding the mechanism involving Fe-based binary metal oxide activating peroxymonosulfate.
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高影响因子
CARBON
·
2020
·
IF 8.821
Shuqi Hu,Wenpeng Ni,Daihui Yang,Chao Ma,Jiaheng Zhang,Junfei Duan,Yang Gao,Shiguo Zhang
Atomically dispersed Fe–N–C catalysts with additional Fe-containing nanoparticles including metal, carbides or oxides have shown great potentials towards oxygen reduction reaction (ORR) catalysis. However, the formation of these synergistically active nanoparticles and the effect of the porous carbon structures remain unclear. In this work, a novel single-atom-involved electrochemical catalyst, i.e. , Fe 3 O 4 nanoparticles encapsulated in atomically dispersed Fe–N–C (Fe 3 O 4 @FeNC) was reported. The optimized Fe 3 O 4 @FeNC exhibits excellent ORR activity with a half-wave potential of 0.890 V and a Tafel slope of 58.8 mV dec −1 , comparable with recently reported ORR catalysts and superior to these of commercial Pt/C. More importantly, the porous architectures not only affect the mass transfer and active sites, but casts huge influence on the nucleation of Fe 3 O 4 nanoparticles, the graphitization degree of the carbon support, the chemical environments of the elements, and the ORR catalytic pathways. Density functional theory calculations show stronger O 2 adsorption on Fe–N–C when supported on Fe 3 O 4 moieties, which may increase the reactant concentration for ORR and promote the overall activity. These findings will provide important references for the future understanding and design of single-atom-involved catalysts with enhanced electrochemical properties .
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 8
·2437-2445
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IF 2.482
Yang Zhi,Luo Mingsheng,Liu Qinglong,Shi Buchang
A potassium- and copper-modified iron-based catalyst (K–Cu–Fe/SiO 2 ) was synthesized by the co-precipitated method. The general structural properties of the catalyst were characterized with various techniques, including SEM, XRD, H 2 -TPR, N 2 adsorption–desorption and Raman spectroscopy. The results reveal that the fresh catalyst is mainly composed of α-Fe 2 O 3 phase with rod-shaped morphology formed by nanoparticles. The effect of activation process on the Fischer–Tropsch synthesis catalytic performance was then investigated. It shows that activation process has an important influence on the reactive stability. The in situ XRD and in situ Raman spectroscopy were used to study the structural changes of the Fe-based catalyst during reduction and reaction processes. The Fe 2 C iron carbide as the main active phase was observed after reduction process. Graphic Abstract
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 11
·11990-12000
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IF 3.056
Cui Yanping,Thathsarani Nimesha,Peng Liang,Gao Ya,Lei Lidan,Zhou Zhengwei,Liang Lili,Shi Xiaoyan
Innovative paramagnetic one-dimensional (1-D) core-shell Fe-Ag@AgCl visible light-driven photocatalysts are synthesized through a template-assisted electrodeposition method trailed by FeCl 3 in-situ oxidation. The metallic nature of Fe-Ag@AgCl is confirmed through scanning electron microscopy (SEM) and crystal nature through X-ray diffraction (XRD). The controllable diameter of Fe-Ag is obtained through the selection of hollow size of the polycarbonate (PC) template. Electron impedance spectroscopy (EIS) confirms through the introduction of Fe to the Ag core that has prolonged the recombination of electron and hole. Escherichia coli ( E. coli ) are employed as the target bacteria to evaluate the photocatalytic disinfection performances. A total of 1.30 mg of Fe-Ag@AgCl is proved to be able to completely inactivate 10 7 CFU (colony forming units)/mL after 120 min of visible light irradiation. The transition electron microscopy (TEM) confirms the stability of the material after the photo reaction. As Fe-Ag@AgCl possesses magnetic properties, the material is recovered through the application of an external magnetic field. SEM images and results of 3D emission extraction matrix (EEM) depict that the bacteria cell death is caused by membrane permeability changes caused by the reduction of membrane associated proteins.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
Jianpeng Li,Xianfeng Li,Hongyan Chen,Dingshu Xiao,Jiajia Li,Dekang Xu
In this paper, we present a facile and one-step way for synthesizing Fe, N dual doped highly porous graphitic biomass carbon (FeNC) by using K 2 FeO 4 to fulfill the activated process and catalytic graphitization of straws. The FeNC demonstrates hierarchically porous structure with large surface area of 1034 m 2 g −1 , Fe, N dual doping with certain amount of Fe-N x , and graphitic structure. With these favorable features, the electrocatalytic activity for oxygen reduction reaction (ORR) reveals that the FeNC exhibits positively onset potential with highly comparable limiting current density when comparing with the sample using conventional KOH activated agent. In additional, the assembled Zn-air battery using FeNC as air-cathode catalyst delivers a maximal power density of 128.4 mW cm −2 . Considering the abundance of straws on the earth and the low-cost and green prepared process, the present FeNC materials are highly promising in application in ORR catalysts for Zn-air battery and other energy-related fields.
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高影响因子
Arabian Journal of Chemistry
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2020
·
IF 4.762
Jiayao Li,Weifeng Song,Zefeng Yu,Qiuhua Li
The quality of dairy farming wastewater in different regions is particular and different. In Southern China, the Chemical Oxygen Demand (COD Cr ) and colourity of effluent from conventional dairy farming wastewater treatment processes are similar. Catalytic ozonation is a very promising technical method. In this paper, the Mn-Fe-Ce/γ-Al 2 O 3 catalyst was prepared via the optimized preparation method of impregnation roasting using γ-Al 2 O 3 as the carrier, and this catalyst was used in the ozonation of actual dairy farming wastewater from treatment facilities. The performance of the Mn-Fe-Ce/γ-Al 2 O 3 catalyst on dairy farming wastewater was investigated using a simulated dynamic test. The effects of the reaction time, pH and catalyst dosage on COD Cr and the colourity removal ratio were investigated. The results show that the optimum treatment conditions were a reaction time of 20 min, pH 9, and catalyst dosage of 15 g/L. The COD Cr removal ratio reached 48.9% and the colourity was 95% under the optimum conditions. BOD 5 /COD Cr increased from 0.21 to 0.54 after catalytic ozonation, indicating that the biodegradability of wastewater was significantly improved. This research provides a new method and theoretical guidance for dairy farming wastewater treatment.
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高影响因子
Journal of Nanomaterials
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2020
·
IF 1.98
Yan Li,Yuhui Weng,Shikong Lu,Meihua Xue,Bixia Yao,Wen Weng,Tao Zheng
In this paper, N, Fe-codoped carbon dots (N, Fe-CDs) were synthesized from β-cyclodextrin, ethylenediamine, and ferric chloride for the first time using a convenient one-step hydrothermal method. The obtained N, Fe-CDs were characterized by various methods including transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy. The N, Fe-CDs exhibited better catalytic activity than horseradish peroxidase (HRP) and caused an evident color change for 3,3,5,5-tetramethylbenzidine in the presence of H2O2. Kinetic experiments show that the apparent Km value for the N, Fe-CDs with TMB (0.40 mM) or H2O2 (0.35 mM) as the substrate was lower than that of HRP (0.43 and 3.70 mM), suggesting that the N, Fe-CDs have a much higher affinity for TMB and H2O2 than HRP. The Km/Vmax value for the N, Fe-CDs ( for H2O2) is significantly lower than that for HRP (), suggesting that the N, Fe-CDs have a stronger catalytic efficiency for H2O2 than HRP. Furthermore, a highly efficient and sensitive colorimetric detection method for glucose was developed using the N, Fe-CDs as mimic peroxidase to detect the hydrogen peroxide generated by the oxidation of glucose by glucose oxidase. The limit of detection for H2O2 and glucose was found to be 0.52 and 3.0 μM, respectively. The obtained N, Fe-codoped carbon dots, which possess simulated peroxidase activity, can potentially be used in the field of biotechnology.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yuexin Wang,Zhen Zhong,Yaseen Muhammad,Hui He,Zhongxing Zhao,Shuangxi Nie,Zhenxia Zhao
Engineering of monodentate ligands induced defects was proposed to modify NH 2 -MIL-88B(Fe) in order to promote its synergetic photo-Fenton catalytic degradation performance for acetamiprid (ACTM) as model neonicotinoid insecticides. Three monodentate ligands with different coordination groups (benzoic acid, pyrrole and pyrrole-2-carboxylic acid) were applied to in-situ induce ligand vacancies on NH 2 -MIL-88B(Fe). Effect of defect coordination mode on its photo-Fenton catalytic performance was investigated through the ACTM degradation reaction. Ligand defects on NH 2 -MIL-88B(Fe) would generate three merits: (1) it can modulate surface properties to enhance adsorption affinity towards ACTM; (2) it can introduce large amount of monodentate ligands and ligand vacancies in MOFs to promote light absorption and electron-hole separation capacity for photo-catalysis; (3) it can increase the amount of Fe Lewis acid sites to improve redox capacity of Fe 2+ /Fe 3+ for Fenton-catalysis. In this work, Pyrrole-2-carboxylic acid (Pac) was proved to introduce more monodentate ligands in MOFs and generate more ligand vacancies as well. As a result, ACTM can be easily captured by defective NH 2 -MIL-88B(Fe) and degraded by in-situ triggered oxidative reaction through the synergistic “photo-Fenton catalysis”. Performance measurements showed that Pac-MIL88(Fe) achieved 7.3 times higher adsorption rate and 5.5 times higher catalytic rate for ACTM than that of pristine MIL88(Fe). Moreover, total organic carbon (TOC) conversion reached 97.0% within only 90 min using Pac-MIL88(Fe) as photo-Fenton catalyst, showing 1.7 times higher than pristine MIL88(Fe). Thus, the in-situ fabrication of ligand defect-containing MIL88(Fe) can be foreseen of potential for designing new MOFs for wider practical applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Ranran Yuan,Jinli Qiu,Cailiang Yue,Chen Shen,Dawei Li,Changqing Zhu,Fuqiang Liu,Aimin Li
Hierarchical MIL-88A(Fe)@ZnIn 2 S 4 heterostructures were synthesized via a facile low-temperature solvothermal method. The combination of MIL-88A(Fe) and ZnIn 2 S 4 produced excellent photocatalytic properties under sunlight irradiation. The enhanced separation efficiency of the photogenerated charge carriers facilitated the optimal photocatalytic performances of 12.5%-HMIL@ZIS, with 100% the of hexavalent chromium (Cr(VI)) and 99.6% of the sulfamethoxazole being converted within 9 min and 60 min at pH 5, respectively. The kinetic rate constants of Cr(VI) reduction (0.5864 min −1 ) and sulfamethoxazole (SMZ) degradation (0.0958 min −1 ) were approximately 15 and 5 times larger than those previously reported. The formation of ·O 2 − could promote the super-high conversion of Cr(VI). Meanwhile, the synergetic effect of 1 O 2 and ·O 2 − played a dominant role in the degradation of sulfamethoxazole. Furthermore, the satisfactory photocatalytic performances could be maintained after four cycles. This work provides new insights into the design of metal-organic framework based photocatalysts and indicates the great potential for efficient purification of actual wastewater.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 27
·34503-34512
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IF 3.056
Huang Kai,Bian Hao,Zhang Meng,Zhan Cong,Li Can,Zhang Wei,Cui Changzheng,Lu Qiang,Lin Kuangfei,Zhao Jianhua
The iron and nickel bimetallic nanoparticles supported by the block copolymer polystyrene- block -poly (acrylic acid) (PS-b-PAA-nZVI-Ni) were synthesized successfully and were applied to assess the degradation of 1,1,1-trichloroethane (1,1,1-TCA) in water. An optimal dose of Ni loading was 2 wt%, while an optimal mass ratio of PS-b-PAA to Ni/Fe, i.e., 0.5:1, at which the dechlorination efficiency was a maximum. The size of PS-b-PAA-nZVI-Ni nanoparticles (average size ~ 50 nm) was three times smaller than that of nZVI-Ni due to the prevention of agglomeration of the resultant zerovalent iron nanoparticles by PS-b-PAA. In the applying aspect, the pseudo-first-order rate constant ( K obs ) of 1,1,1-TCA removal by PS-b-PAA-nZVI-Ni was 0.0142 min −1 within 240 min, which was approximately five times higher than nZVI. Meanwhile, PS-b-PAA-supported nZVI-Ni nanoparticles penetrated much deeper in quartz sand columns than nZVI-Ni nanoparticles, indicating PS-b-PAA had significant influence on nZVI transport. The findings from this study suggested that PS-b-PAA-nZVI-Ni, with its high reactivity, selective screening for 1,1,1-TCA, could be one significant potential for use as remedial agent to treat chlorinated solvents in water.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhen Zhong,Min Li,Jinghao Fu,Yuexin Wang,Yaseen Muhammad,Sihan Li,Jiaxing Wang,Zhongxing Zhao,Zhenxia Zhao
Cu 2 O/MIL(Fe/Cu) composite was fabricated via an in-situ Cu-bridging strategy to enhance interfacial synergistic effect of photo-Fenton catalysis for thiacloprid (TCL) degradation. Characterization results showed that: (1) Cu 2 O was proved to grow on the surface of MIL(Fe/Cu) in Cu 2 O/MIL(Fe/Cu) composite and display a high BET surface area of 1553 m 2 /g; (2) Cu 2 O/MIL(Fe/Cu) reduced band gap from 2.5 to 1.3 eV and extended absorption from UV to visible region; (3) Cu-bridge was proved to promote the intimate interface between Cu 2 O and MIL(Fe/Cu), which accelerated charge transferred and shortened the binding gap and the reaction pathway from photo-induced electrons to Fenton-generated radicals. As a result, this boosted the redox reaction of Fe 2+ /Fe 3+ and promoted the reversible degree of this catalytic redox ability of MIL(Fe). Catalytic performance exhibited that (1) Cu 2 O/MIL(Fe/Cu) showed a fast kinetics (2–40 times faster than the state-of-the-art catalysts) and ultra-high mineralization (82.3% within 80 min) for TCL degradation; (2) Cu 2 O/MIL(Fe/Cu) showed a promising cycling stability due to improved charge transfer ability that could protect Cu 2 O from photo-corrosion during photo-Fenton reaction; (3) The catalytic performance of Cu 2 O/MIL(Fe/Cu) was characterized and seven photocatalytic intermediates were identified by both HPLC/MS and Surface Enhanced Raman Spectroscopy. The cyanoimino group in TCL was proved for the first time to be attacked primarily. Moreover, among all the detected intermediates, thiazolidin-2-amine (P6) was found to be the most stable intermediate to be degraded, and it can directly influence the TOC determination during photodegradation process.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Jun Wei Wang,Zelong Bao,Rong Qiao Xiang,Gao Hao Hu,Yong Kang Hu,Qing Ma,Bin Li,Hong Guang Jia
As a solar energy storage medium or heat transfer medium at moderate-high temperature, the molten NaCl-MgCl 2 has the advantages of high stability and low cost. But a pipe and container material with Cr will be corroded badly in a molten chloride. Based on the founded corrosion resistance phase (Fe 0.64 Ni 0.36 ) in previous experiments, the corrosion behavior of a new alloy of Fe-37 wt% Ni with rare earth alloy element Sc in the molten eutectic NaCl-MgCl 2 at 520 °C was studied. The corrosion rate of the Fe-37 wt% Ni alloy is lower than that of the researched Fe-based superalloys (GH1035 and GH1140). After corrosion for 15 h, a porous structure with Ni-rich and Fe-depletion is formed at the local location on the Fe-37 wt% Ni surface. For the specimens with Sc (0.3 and 0.5 wt %), a compact protective MgO layer covers on the porous structure, which prevents further corrosion in the molten salt . It is speculated that the Sc is oxidized to Sc 2 O 3 directly or by the chlorination-oxidation reactions, which improves the adhesion strength between the MgO layer and the alloy matrix by the effects of inhomogeneous nucleation and pinning.
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高影响因子
危险品化学品经营许可证（带存储）