JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jiuli Chang,Liming Chen,Shiqi Zang,Yifan Wang,Dapeng Wu,Fang Xu,Kai Jiang,Zhiyong Gao
A facile and efficient oxygen evolution reaction (OER) catalytic system was constructed based on interconnected Ni(OH) 2 nanosheets arrays electrode and Fe(III) containing alkali electrolyte. The partial deposition of Fe(III) onto Ni(OH) 2 with heterostructure obviously enhanced the OER current density and reduced the overpotential, and the Fe(III) cations in electrolyte also furnished positive contribution to the catalytic reaction, the synergy between Ni(OH) 2 electrode and Fe(III) cations in electrolyte therefore substantially improved the OER catalytic efficiency with low overpotential (285 mV at current density of 50 mA cm −2 ) and obviously enhanced current density (391 mA cm −2 at 1.8 V). The current work expands our understanding on the effect of Fe(III) cations in electrolyte to OER efficiency of Ni based catalyst, and opens up a cost-effective and practical avenue to enhance the OER catalytic efficiency by introducing metal cations in alkali electrolyte.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Guangda Yu,Fenglian Fu,Chujia Ye,Bing Tang
The mobility of Cr(VI) in the environment is affected by the transformation of ferrihydrite (Fh) and ferrihydrite-humic acid co-precipitates (Fh-HA). However, the impacts of Fe(II)-induced transformation of Fh and Fh-HA on the mobility, speciation and partitioning of associated Cr(VI) remain unclear. In this study, the behaviors of adsorbed Cr(VI) during Fh and Fh-HA aging at 70 °C for 9 days (pH 0 = 3.0 and 7.0) in the absence and presence of Fe(II) were studied. Results revealed that the main speciation of Cr(VI) after transformation was non-desorbable Cr and its formation involved the following pathways. Firstly, Fe(II) (0.2 and 2.0 mM) induced the transformation of Fh-HA to hematite and goethite, promoting the structural incorporation of adsorbed Cr into hematite and goethite via complexation. Secondly, under neutral condition (pH 0 = 7.0), the low concentration of Fe(II) (0.2 mM) could not reduce completely Cr(VI) to Cr(III) and thus residual Cr(VI) was incorporated into the Cr(III)-Fe(III) co-precipitates. Thirdly, coprecipitated humic acid not only reduced Cr(VI) to Cr(III) via polysaccharide, but also formed complexes with incorporated Cr through carboxylic groups to sequester Cr. Our results demonstrate that Fe(II)-induced transformation of Fh-HA exerts major influences on associated Cr(VI) speciation and partitioning.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Jinsuo Lu,Zhanguo Cui,Xiaoyong Deng,Zhijie Liang,Shouning Chai,Junyu Fan,Zhiqiang Zhang,Zhiwei Zhao
Ferrate (Fe(VI)) is usually effective for oxidizing a variety of organic pollutants within a few seconds, but some recalcitrant asorganophosphorus pesticides such as dimethoate require higher dose of Fe(VI) and inorganic phosphorus produced by mineralization is difficult to remove. In this study, acid-activated ferrate (Fe(VI)) was firstly used to degrade organophosphorus pesticides dimethoate and simultaneously remove total phosphorus (TP) from solution under simulated sunlight. At a Fe(VI):dimethoate molar radio of 15:1, dimethoate was almost completely removed within 20 min and 47% of TP in the solution was removed by the reduction product of Fe(VI) within 240 min. Electron paramagnetic resonance (EPR) and terephthalic acid (TA) fluorescence experiments showed that •OH radicals were continuously generated in the system, and •OH formation pathway was proposed. Importantly, the involvement of •OH in acid-activated Fe(VI) process was confirmed for the first time by EPR. In the acid-activated Fe(VI)/simulated sunlight system, the removal of dimethoate and TP gradually increased with the decrement of activation pH, whereas the increase of molar ratio of Fe(VI):dimethoate enhanced the removal of dimethoate and TP. The addition of inorganic anions (HCO 3 - and NO 2 - ) had obvious inhibitory effects on dimethoate and TP removal. Eight degradation products including O,O,S-trimethylphosphorothiate, omethoate and 2- S -methyl-(N-methyl) acetamide were determined by gas chromatography mass spectrometry (GC-MS) analysis, and two possible degradation pathways were proposed. The insights gained from this study open a new avenue to simultaneously degrade and remove organic contaminants .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ruowen Liang,Zhoujun He,Yi Lu,Guiyang Yan,Ling Wu
Although both step-scheme (S-scheme) heterojunction and metal–organic framework (MOF) photocatalysts have been intensively studied, few efforts have been devoted to combining them to establish high-performance MOF-based S-scheme photocatalysts. In this work, binary Ag@MIL-68(Fe) (Ag@MFe) hybrids were first fabricated by decorating Ag nanoparticles (Ag NPs) onto MIL-68(Fe), an Fe-based MOF. Owing to the high specific surface area of MIL-68(Fe), the plasmonic Ag NPs were uniformly distributed on its surface. Then, AgBr particles were deposited on the Ag@MFe hybrids via precipitation to form the final ternary sandwich-like hierarchical AgBr-Ag@MFe photocatalyst. The 30 %AgBr-1.5 %Ag@MFe sample exhibited excellent photocatalytic performance for the degradation of rhodamine B under visible light irradiation ( λ ≥ 420 nm), with an effectiveness 9.2 and 2.1 times higher than those of the original MIL-68(Fe) and binary 1.5 %Ag@MFe hybrid, respectively. Furthermore, 30 %AgBr-1.5 %Ag@MFe performed as a high-efficiency bifunctional photocatalyst towards the detoxification of water contaminants (mixture of a dye and Cr(VI)). The significantly enhanced photoactivity was attributed to the effective spatial separation of photogenerated electron–hole pairs via S-scheme charge transfer. Moreover, the plasmonic Ag NPs assembled into the contact interface of AgBr and MIL-68(Fe) enhanced the vectorial interfacial electron transfer. The formation of an S-scheme heterojunction was supported by X-ray photoelectron spectroscopy and electron spin resonance studies. This novel bifunctional AgBr-Ag@MIL-68(Fe) hybrid photocatalyst system not only provides new opportunities for environmental remediation but also highlights a promising strategy to construct high-efficiency S-scheme photocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Yang Li,Ruoyun Lin,Fangjie Lv,Xiaoyu Zhao,Tianzhi Yong,Xiaojun Zuo
A heterogeneous electro-Fenton (hetero-EF) system can effectively broaden the applicable pH range, although the decreased electrogeneration efficiency of H 2 O 2 at elevated pH (especially neutral conditions) is unfavorable for the efficient removal of organic pollutants. Herein, a tannic acid-Fe complex derivative-modified carbon felt (TFD@CF) cathode was prepared for hetero-EF treatment of organic pollutants over a wide pH range. Interestingly, the as-prepared hetero-EF cathode could act as a pH regulator that acidified the solution over a wide pH range. As expected, the TFD@CF cathode exhibited excellent hetero-EF activity for the removal of diverse organic pollutants (such as methyl orange, methylene blue , sulfamerazine, bisphenol A and 2,4-dichlorophenoxyacetic acid) at neutral and even alkaline pH (removal efficiency >90 %). A total of 2.98 kWh kg −1 COD −1 with 83.2 % COD removal could be achieved by the TFD@CF cathode for the treatment of actual textile dyeing secondary wastewater. Electrochemical characterizations proved that the TFD@CF cathode had excellent electrochemical properties with improved electron transfer ability and a well-pronounced Fe(III) electroreductive response. Meanwhile, more acidic groups were newly generated during the electrochemical reaction (an increase of 30.1 %), thus dissociating more H + into solution. The identification of reactive oxygen species suggested that OH and 1 O 2 could be responsible for the removal of organic pollutants in the TFD@CF EF system. These interesting findings may provide new insights into the design of multifunctional hetero-EF cathodes for the removal of refractory organic pollutants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Fangfang Wu,Youwei Wang,Pengchao Ruan,Xinxin Niu,Dong Zheng,Xilian Xu,Xiaobin Gao,Yanhui Cai,Wenxian Liu,Wenhui Shi,Xiehong Cao
Vanadium-based oxides with high theoretical specific capacity and open crystal structure are promising cathodes for aqueous zinc ion batteries . However, the frustrating dissolution and structural collapse of vanadium-based oxides, especially when cycling at a low current density, lead to severe performance degradation. Here, we demonstrate doping of Fe opens up a rapid Zn 2+ diffusion channel, and results in a stable layer-structured vanadium oxide nanobelt (FeVO) with an expanded interlayer spacing up to 10.8 Å. This enables a cathode with high structural stability, leading to an outstanding cyclic stability of 300 cycles at a low current density of 0.5 A g −1 with a high retention of 94.6%. Even cycling at 0.2 A g −1 , the Fe-doped vanadium oxide still maintains a retention of 93.6% after 150 cycles. A reversible co-intercalation mechanism of Zn 2+ and H 2 O is further revealed via ex - situ X-ray powder diffraction (XRD) and X-ray photoelectron spectra techniques. Such boosted electrochemical performance is attributed to the large interlayer space providing ion diffusion path and a stable layered structure. These excellent characteristics of the prepared vanadium oxide cathode show great potential for high-performance aqueous zinc ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Pijun Duan,Jingwen Pan,Weiyan Du,Qinyan Yue,Baoyu Gao,Xing Xu
Cheap and abundant Fe based catalysts in advanced oxidation progresses (AOPs) usually exhibit radicals or high-valent Fe species (HV-Fe) dominated activation mechanism. In this contribution, the atomically dispersed Fe on g-C 3 N 4 (SAFe-CN) was fabricated for peroxymonosulfate (PMS) activation to degrade o-phenylphenol (OPP). OPP removal was not impeded by common radical scavengers, indicating the absence of SO 4 •− and •OH. The involvement of 1 O 2 and HV–Fe was excluded and the mediated electron transfer was finally identified as the dominated mechanism. Atomically dispersed Fe sites in SAFe-CN were verified as active sites for reacting with O O bond of PMS and ulteriorly electron shuttling in pollutants degradation. A water treatment filter was fabricated using SAFe-CN and it remained 100% of OPP removal after 100 h of operation. These results provide new insights into the mechanism of mediated electron transfer as well as potential application of non-radical dominated process at device level.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yihui Wu,Yuan Zhang,Yuxin Wang,Zhen He,Zhengjian Gu,Shuochao You
Ni–Fe–Sn electrocatalyst supported on nickel foam (Ni–Fe–Sn/NF) with high efficiency of hydrogen evolution reaction (HER) has been successfully fabricated through one-step potentiostatic electrodeposition route. The optimized Ni–Fe–Sn/NF displayed an extremely low overpotential of, respectively, 144 and 180 mV at 50 and 100 mA cm −2 for HER in alkaline condition. Moreover, it could retain its superior stability for at least 12 h. The remarkable electrocatalytic activity of our electrocatalyst is ascribed to the high conductivity originated from synergistic effects between Ni, Fe, and Sn during HER process.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 36
·2102002
·
IF 13.281
Hong Li,Xinxin Shu,Peiran Tong,Jihui Zhang,Pengfei An,Zhengxing Lv,He Tian,Jintao Zhang,Haibing Xia
In this work, Fe–Ni alloy nanoclusters (Fe–Ni ANCs) anchored on N, S co-doped carbon aerogel (Fe–Ni ANC@NSCA catalysts) are successfully prepared by the optimal pyrolysis of polyaniline (PANI) aerogels derived from the freeze-drying of PANI hydrogel obtained by the polymerization of aniline monomers in the co-presence of tannic acid (TA), Fe 3+ , and Ni 2+ ions. In addition, the optimal molar ratio of the TA, Fe 3+ , and Ni 2+ ions for synthesis of Fe–Ni ANC@NSCA catalysts are 1:2:5, which can guarantee the formation of carbon aerogel composed of quasi-2D porous carbon sheets and the formation of high-density Fe–Ni ANCs with an ultrasmall size between 2 to 2.8 nm. These Fe–Ni ANCs consisting of N 4 –Fe–O–Ni–N 4 moiety are proposed as a new type of active species for the first time, to the best of the authors’ knowledge. Thanks to their unique features, the Fe–Ni ANC@NSCA catalysts show excellent performance in oxygen reduction reaction with a half-wave potential ( E 1/2 ) of 0.891 V and oxygen evolution reaction (260 mV @ 10 mA cm −2 ) in alkaline media as bifunctional catalysts, which are better than the state-of-the-art commercial Pt/C catalysts and RuO 2 catalysts. Moreover, Zn–air battery assembled with the Fe–Ni ANC@NSCA catalysts also shows a remarkable performance and exceptionally high stability over 500 h at 5 mA cm −2 .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Mengmeng Zhang,Jiaying Lou,Rui Xu,Peng Li,Yunfei Sha,Hui Zhang,Yu Jia,Zhenxia Chen,Da Wu,Yun Ling,Yaming Zhou
Metal-organic frameworks (MOFs) featuring a fcu-type net based on 12-connected [Zr 6 (μ 3 -O) 4 (μ 3 -OH) 4 ] cluster have received considerable interest for the fundamental investigation of structure-property relationships in a wide range of catalytic reactions . In this work, the bipyridine (bpy) chelate group was introduced into the fcu-type framework of UiO-67, giving UiO-67bpy as the catalyst support. Then, FeCl 3 was post-synthetically anchored to the bpy group, resulting into the isolation of FeCl 3 /UiO-67bpy. Catalyzed hydrolysis of 5-hydroxylmethoxyfurfural (HMF) into levulinic acid (LA) was then explored and revealed that it can efficiently and selectively catalytic convert HMF into LA, which is superior to that of FeCl 3 /UiO-67 where FeCl 3 is encapsulated in the cage of UiO-67 and dispersed on the pore surface. The recyclability studies further confirmed the importance of anchored FeCl 3 where there is no significant decrease in catalytic activity as compared with that of FeCl 3 /UiO-67. Taking the detailed textural porosity and catalytic results of isomorphous structures in consideration, our studies revealed that narrowing the pore size with anchored FeCl 3 on the skeleton of the fcu-type Zr-MOF rather than encapsulating FeCl 3 inside the cage is more favored for the rehydration reaction of HMF to LA.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2019
·
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2019
·
IF 3.031
Ziye Zhao,Lei Wang,Jinmeng Fan,Yunhua Song,Guangwen Chu,Lei Shao
Rotor-stator reactor (RSR), a novel high-gravity device, was employed in the O 3 /persulfate (PS)/Fe 2+ process to enhance the degradation of indigo carmine (IC) in simulated wastewater. It was found that IC degradation efficiency increased with the increase of Fe 2+ concentration, RSR rotation speed, O 3 concentration and gas-liquid ratio, but decreased with the increase of IC concentration and temperature. When the rotation speed of RSR increased from zero to 1200 rpm, IC degradation efficiency increased from 25.6% to 64.2%. Because of the synergetic effects of the oxidative species (O 3 , OH, SO 4 − etc.), IC degradation efficiency in the O 3 /PS/Fe 2+ process was significantly higher than that in the O 3 or PS/Fe 2+ process. The high IC degradation efficiency can also be attributed to the good micromixing effect of the RSR. When the O 3 /PS/Fe 2+ process in the RSR was adopted before the sequencing batch reactor activated sludge process , both IC and COD degradation efficiencies increased significantly as a result of the improved biodegradability of the IC wastewater. Furthermore, a possible degradation mechanism of IC in the O 3 /PS/Fe 2+ process was proposed.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）