INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Lirong Huang,Yanping Hou,Zebin Yu,Zhenbo Peng,Li Wang,Jun Huang,Boge Zhang,Lun Qian,Leidan Wu,Zongchen Li
The electrode with high catalytic activity , low hydrogen overpotential and low cost is desired for hydrogen evolution reaction (HER) via electrocatalytic water splitting. In this study, Pt/Fe-Ni foam (Pt/Fe-NF) electrode was synthesized via cathodic electrodeposition followed by impregnation deposition. Physical and electrochemical properties of Pt/Fe-NF, NF and Pt/NF electrodes were characterized by various techniques. The Pt/Fe-NF electrode exhibited better electrochemical activity for HER under alkaline condition than those of Pt/NF and NF electrodes, owing to the introduction of zero valences Pt and Fe onto the NF, and synergetic effect resulted from the formation of Fe-Ni alloy. Furthermore, Pt/Fe-NF electrode showed extremely high double-layer capacitance (69.1 mFcm −2 ), suggesting high active sites for the Pt/Fe-NF. Tafel slope of Pt/Fe-NF was 59.9 mV dec −1 , indicating that the Volmer-Heyrovsky HER mechanism was the rate-limiting step. The Pt/Fe-NF electrode with great electrocatalytic activity is a promising electro-catalyst for industrial hydrogen production from alkaline electrolyte .
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MICROPOROUS AND MESOPOROUS MATERIALS
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2016
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IF 3.349
Lulu Li,Qinglun Meng,Junjun Wen,Jingui Wang,Gaomei Tu,Chunhui Xu,Fumin Zhang,Yijun Zhong,Weidong Zhu,Qiang Xiao
Hierarchical Fe-ZSM-5 zeolites were directly synthesized from a zeolitic synthesis system in the presence of a silane coupling agent 3-glycidoxypropyltrimethoxysilane (GPTMS). The structure and morphology of the hierarchical Fe-ZSM-5 synthesized with different amount of GPTMS were characterized by XRD , SEM, TEM , and N 2 adsorption-desorption techniques. UV–vis and NH 3 -TPD were used to investigate the state of iron species and acidity, respectively. The steaming activated hierarchical Fe-ZSM-5 were used as catalysts in the direct oxidation of benzene to phenol (BTOP) with N 2 O as oxidant, showing an improved performance in terms of both activity and stability compared to Fe-ZSM-5 synthesized in the absence of GPTMS. A comparison study on the n -butane uptakes in Fe-ZSM-5 zeolites indicated the internal mass-transfer limitations of the hierarchical Fe-ZSM-5 zeolites were significantly improved.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Yaqin Chen,Jiafeng Wu,Weisen Yang,Yuanyuan Fu,Rihui Zhou,Shouhui Chen,Lixue Zhang,Yonghai Song,Li Wang
Transition metal oxides@carbon(C) nanocomposites with hierarchical three-dimensional (3D) core-shell nanoarchitectures, large surface area and high electrical conductivity as anode materials for lithium ion batteries (LIBs) are very desirable. Herein, we developed a simple and feasible route to fabricate novel hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres with well-defined hollow microstructures via one-step carbonization of Zn/Fe-metal organic frameworks for the first time. The as-prepared hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres were carefully characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, thermogravimetric analysis , N 2 adsorption/desorption isotherm, transmission electron microscopy and electrochemical techniques . The results showed ultrafine ZnO and ZnFe 2 O 4 nanocrystals were uniformly encapsulated by few carbon layers which was derived from in-situ carbonization of the organic ligands. Benefiting from their special hollow nanoarchitectures, ultrafine ZnO and ZnFe 2 O 4 nanocrystals encapsulated by a few carbon layers, large specific surface area and high electrical conductivity, the hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres presented high reversible capacities of 1283 and 1100 mA h g −1 after first 100 cycles and the following 100 cycles at current density of 100 and 200 mA g −1 , respectively. A high specific capacity of 155 mA h g −1 was obtained at relatively large current rates of 20 A g −1 .
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Journal of Materials Chemistry A
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2017
·Vol. 5
·期 30
·15797-15807
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IF 8.867
Dan Zhao,Xiao-Hui Liu,Yue Zhao,Peng Wang,Yi Liu,Mohammad Azam,Saud I. Al-Resayes,Yi Lu,Wei-Yin Sun
Excess and deficiency of iron(III) and antibiotics from normal permissible limits will induce serious disorders, so their detection is important but challenging. In this work, by introducing a new amino triazole ligand N1-(4-(1H-1,2,4-triazole-1-yl)benzyl)-N1-(2-aminoethyl)ethane-1,2-diamine (L), a series of Cd(II)-based metal–organic frameworks (MOFs) [Cd3(BDC)3(DMF)2] (1), [Cd(L)(BDC)]2·2DMF·H2O (2), [NaCd2(L)(BDC)2.5]·9H2O (3), [Cd2(L)(2,6-NDC)2]·DMF·5H2O (4) and [Cd2(L)(BPDC)2]·DMF·9H2O (5) were synthesized. MOFs 1, 2 and 3 obtained under the same conditions with the same auxiliary ligand (H2BDC) but different amounts of alkali (NaOH) show distinct 3D, 1D and 3D framework structures, respectively, in which L and BDC2− exhibit varied coordination modes. 4 and 5 with 3D structures were isolated by using longer auxiliary ligands of 2,6-H2NDC and H2BPDC. The porosity and excellent fluorescence performance of 3, 4 and 5 make them potential luminescent sensors for Fe(III) and antibiotics. The results show that 3, 4 and 5 represent high sensitivity for the detection of Fe(III) ions with detection limits of 155 ppb for 3, 209 ppb for 4 and 297 ppb for 5 due to the existence of open channels and chelating NH2 sites. In addition, the strong emissions of 3, 4 and 5 can be quenched efficiently by trace amounts of NFs (nitrofurazone, NZF; nitrofurantoin, NFT; furazolidone, FZD) antibiotics even in the presence of other competing antibiotics such as β-lactams (penicillin, PCL). They are responsive to NZF with detection limits of 162 ppb for 3, 75 ppb for 4 and 60 ppb for 5.
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CHEMICAL PHYSICS LETTERS
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2017
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IF 1.815
Shiliang Wei,Kun Jia,Hongguo Shou,Xuefei Zhou,Pan Wang,Xiaobo Liu
Polyarylene ether nitrile (PEN) is traditionally used as high performance thermoplastics in various advanced engineering materials fields. However, the preparation of optically active PEN based materials, especially in aqueous solution, is still a great challenge. In this work, the side chain carboxylated PEN can be readily dissolved in alkaline solution but showing strongly quenched luminescence. Fortunately, the cationic surfactant of cetyltrimethylammonium bromide (CTAB) was able to recover the fluorescence emission of water soluble PEN, which can be subsequently quenched by Fe 3+ ions, leading to the selective determination of Fe 3+ ions in aqueous solution.
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MATERIALS RESEARCH BULLETIN
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2016
·
IF 2.435
Shuqiang Jiao,Jingjing Tuo,Hongliang Xie,Zihang Cai,Shuai Wang,Jun Zhu
Prussian blue analogues (PBAs) have recently attracted extensive interests as a new class of cathode materials for rechargeable batteries. Copper hexacyanoferrate, a typical Prussian blue analogue with the chemical formula Cu 3 [Fe(CN) 6 ] 2 , has been synthesized by solution precipitation method and investigated as a cathode material for sodium-ion batteries. The galvanostatic cycling tests show a specific capacity of 44 mA h g −1 at a current density of 20 mA g −1 , and the capacity retention can be 57.1% after 50 cycles. The material can also deliver a specific capacity of 37 mA h g −1 and 25 mA h g −1 at a rate of 50 mA g −1 and 100 mA g −1 , respectively. Furthermore, the material exhibits a high reduction peak at 3.32 V vs. Na + /Na, which brings more power to sodium-ion batteries. The data indicate the as-prepared material is capable of realizing the single electron redox capacity due to the reduction of Fe 3+ /Fe 2+ . All of the findings suggest a possible use of Cu 3 [Fe(CN) 6 ] 2 nanoparticles as environmental friendly and cost-effective cathode material, which also open new perspectives to develop cathode materials for sodium-ion batteries.
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Journal of Inorganic and Organometallic Polymers and Materials
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2017
·Vol. 28
·期 3
·1299-1304
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IF 1.577
Xiao He,Zhang Weibo,Wei Yicui,Yu Lubin,Chen Lihui
In this study, Fe/ZnO composite nanosheets were successfully prepared by hydrothermal method using nanofibrillated cellulose (NFC) as a soft template. The crystalline and morphology structure of the samples were characterized by X-ray diffraction (XRD), BET analysis, Scanning electron microscopy (SEM) and Transmission electron microscope (TEM). Fe doping not only fabricated ZnO from square to strip shape, but also brought larger surface area and pore volume, resulting 59.7% removal of tetracycline by adsorption action. UV–Vis absorption test, X-ray photoelectron spectroscopy (XPS) and Energy dispersive spectrometer (EDS) have shown that iron had successfully embedded into the ZnO nanosheets resulting in red-shift of absorption wavelength. Fe/ZnO nanocomposites had about 90% photodegradation for tetracycline after two hours’ UV-irradiation.
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CELLULOSE
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2017
·Vol. 24
·期 6
·2403-2413
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IF 3.417
Xu Siquan,Yan Xiaopei,Bu Quan,Xia Haian
A series of carbon nanotube (CNT)-supported monometallic Pd and bimetallic Pd–Fe catalysts were synthesized and employed for catalytic hydrogenolysis of cellulose into polyols, including hexitol, ethylene glycol (EG), 1,2-propanediol (1,2-PG), and glycerol (Gly). The physicochemical properties of the catalysts were characterized by nitrogen physical adsorption measurements, X-ray diffraction analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy. The total yield of hexitol, EG, 1,2-PG, and Gly in hydrolytic hydrogenation of cellulose was 37, 55, and 53% for Pd/CNTs, Pd–Fe/CNTs (Pd:Fe = 1:1), and Pd–Fe/CNTs (Pd:Fe = 1:2), respectively. Addition of Fe to Pd significantly modified the physicochemical properties of the nanoparticles and their catalytic performance, especially regarding hexitol selectivity. The promoting effect of Fe, especially for hexitol selectivity, compared with the monometallic catalyst is due to the fact that incorporation of Fe may stabilize Pd 0 nanoparticles and lead to downshift of the d -band center of Pd metal nanoparticles by charge transfer from Fe to Pd. Recycling experimental results showed that leaching of Fe resulted in a significant decrease in the hexitol yield obtained using the Pd–Fe/CNTs after the first recycle, further demonstrating that Fe element plays a promoting role for hexitol formation.
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ENVIRONMENTAL POLLUTION
·
2017
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IF 5.099
Xue Liu,Jing–Wei Fu,Evandro Da Silva,Xiao–Xia Shi,Yue Cao,Bala Rathinasabapathi,Yanshan Chen,Lena Q. Ma
Arsenic (As) in soils is often adsorbed on Fe-(hydro)oxides surface, rendering them more resistant to dissolution, which is undesirable for phytoremediation of As-contaminated soils. Arsenic hyperaccumulator Pteris vittata prefers to grow in calcareous soils where available Fe and As are low. To elucidate its mechanisms of acquiring Fe and As from insoluble sources in soils, we investigated dissolution of goethite with pre-adsorbed arsenate (AsV; As-goethite) in presence of four organic ligands, including two root exudates (oxalate and phytate, dominant in P. vittata ) and two microbial siderophores (PG12-siderophore and desferrioxamine B). Their presence increased As solubilization from As-goethite from 0.03 to 0.27–5.33 mg L −1 compared to the control. The siderophore/phytate bi-ligand treatment released 7.42 mg L −1 soluble Fe, which was 1.2-fold that of the sum of siderophore and phytate, showing a synergy in promoting As-goethite dissolution. In the ligand-mineral-plant system, siderophore/phytate was most effective in releasing As and Fe from As-goethite. Moreover, the continuous plant uptake induced more As-goethite dissolution. The continued release of As and Fe significantly enhanced their plant uptake (from 0.01 to 0.43 mg plant −1 As and 2.7–14.8 mg plant −1 Fe) and plant growth (from 1.2 to 3.1 g plant −1 fw) in P. vittata . Since microbial siderophores and root exudates often coexist in soil rhizosphere, their synergy in enhancing dissolution of insoluble As-Fe minerals may play an important role in efficient phytoremediation of As-contaminated soils.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
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IF 2.76
Binbin Shao,Yiyi Guan,Zeyuan Tian,Xiaohong Guan,Deli Wu
Structural Fe(II) Hydroxide (SFH) was used to remove As(III) and As(V) from aerated synthetic wastewater with initially 30 mg/L As at neutral pH values. Batch experiments were performed to investigate the influence of O 2 , pH and coexisting HPO 4 2⿿ on As removal by 0.5 g (Fe)/L SFH. The results suggested that removal efficiency for As(III) and As(V) were ⿼60% and ⿼50% under anoxic conditions at initial pH 7.0 and 9.0, respectively. However, the efficiency increased to over 90% for both As(III) and As(V) under oxic conditions. The in situ mineral transformation of SFH to newly formed Fe(II/III) and FeOOH was responsible for the robust removal. As(III) removal was nearly unaffected by HPO 4 2⿿ (1.0 mM), while obviously inhibition was observed in the case of As(V). The microstructure of fresh and reacted SFH was characterized by FTIR and XPS and these results indicate that As was removed via inner-sphere complexation and precipitation. XPS studies showed that As(III) was converted to As(V) after 2 h of reaction in the pH range of 7.0⿿9.0, which is attributable to enhanced formation of Fe(IV) by the Fenton reaction during mineral transformation. In practice, results of this study suggest that aeration is advantageous to significantly enhancement of As(III) oxidation and removal with highly reactive SFH.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaoxiao Zheng,Xiaoping Chen,Xiaoqing Li,Jide Zhu,Jipeng Chen,Fengcai Lin,Lijuan Shen,Yanlian Xu,Lilong Jiang
The development of stable and effective catalysts to convert toxic H2S into high value-added sulfur is essential for production safety and environmental protection. However, the inherent defects of traditional iron- and zirconium-based catalysts, such as poor activity, high oxygen consumption, and low sulfur selectivity, limit their further developments and applications. Herein, the Fe–Zr bimetallic organic framework FeUIO-66(x) with different cubic morphologies was synthesized via a facile solvothermal method. The results indicate that the introduction of Fe not only increases the specific surface area and weak L-sites of the catalyst without changing its crystal structure, which provides enough reaction space and more active sites for the adsorption and activation of H2S, but also reduces the activation energy of the reaction, significantly promoting the selective oxidation of H2S. As a result, the as-obtained FeUIO-66(1) catalyst exhibits the highest desulfurization activity and superior durability and water resistance stability, and its H2S conversion and sulfur selectivity within 50 h are 100 and 88%, respectively. More importantly, the structure of the catalyst after the desulfurization reaction is consistent with that of the fresh counterpart. The study offers new insights into the development of effective and stable bimetallic catalysts to eliminate H2S and recycle sulfur.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Sheng Zhong,Bin He,Shuang Wei,Ruirui Wang,Ruirui Zhang,Ruixia Liu
Electrocatalytic glycerol oxidation reaction to produce high-value organic chemicals has research significance for managing the overproduction of glycerol and handling the energy crisis. Herein, a copper-based self-supporting catalytic electrode with a dynamic Fe-O-Cu optimized coordination (Fe-CuO x /CF) was prepared. The oxygen-bridged asymmetric coordination structure (Fe-O-Cu) optimized the electronic configuration and promoted the formation of the crucial intermediate species. After Fe was embedded in the lattice of copper oxides, a remarkable enhancement in the adsorption capacity of OH - and glycerol was confirmed. As a result, Fe-CuO x /CF exhibited an excellent production capacity of formate, with high faradaic efficiency and selectivity values of 93.65 % and 95.10 %. Concurrent production of formate and high purity hydrogen was achieved in the double-electrode flow electrolyzer. This work provides guiding significance for the optimization of the catalytic coordination and the design of high-efficiency transition metal-based catalysts for electrooxidation of biomass platform molecules.
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