JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·301-310
·
IF 1.108
Ye Wei,Zhao Binxia,Gao Han,Huang Jiajun,Zhang Xiaoli
Fe,Zn,Al-pillared montmorillonite (Mt) were prepared by ion exchange reaction. Effect of the Fe/Zn molar ratio in Fe,Zn,Al-pillaring solution on the structural properties of Fe,Zn,Al-Mt was examined. Characterization studies were performed by N 2 -adsorption/desorption, ICP, FTIR, DR UV–Vis spectroscopy and XRD. The interlayer space, specific surface and volume of micropores of pillared-Mt was 18.8 Å, 157 m 2 g −1 and 0.114 cm 3 g −1 respectively. Besides, the catalytic performance of Fe,Zn,Al-Mt was analyzed through wet peroxide oxidation of Orange II under mild experimental condition. The results indicated that the catalytic performance of Fe,Zn,Al-Mt was affected by the Fe/Zn molar ratio as following pattern: the obtained pillared solids with lower Fe/Zn molar ratios exhibited better catalytic performance and less iron leaching during the reaction. Moreover, the introduction of zinc into Mt shortened the induction time of reaction and improved the catalytic behaviour. Throughout this work, the chemical oxygen demand removal of OII was 77.1 % after the solution treated by Fe,Zn,Al(3/7)-Mt (defined as the Fe/Zn molar ratio of 3/7 in the pillaring solution) catalyst at temperature of 60 °C and atmospheric pressure of 1 atm.
研究领域:
环境化学
·
催化材料
·
废水处理
·
无机非金属材料
·
表面科学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2024
·Vol. 78
·期 6
·3761-3772
·
IF 2.1
Chen Yufeng,Zhao Ning
Surface-enhanced Raman scattering (SERS) has been widely applied in various fields due to its high sensitivity and rapid response capability. In this paper, a MIL-101(Fe)@Ag composite SERS substrate was prepared using photoreduction method. The synthesized MIL-101(Fe)@Ag composite substrate combines the localized surface plasmon resonance properties of silver nanoparticles and the high adsorption capacity of metal–organic frameworks. MIL-101 (Fe)@Ag composite substrate was characterized by FTIR, UV and SEM. The SERS activity of the composite substrates was characterized by measuring the Raman signals of PATP. The detection limit of the substrate for PATP was 10 –8 M, with a relative standard deviation of only about 5.3%, indicating good SERS effect and reproducibility of the substrate. Finally, the prepared substrate was applied for formaldehyde detection, with a detection limit of 10 –9 M. Principal component analysis was used for quantitative analysis of formaldehyde. This work proposes a simple method for synthesizing MIL-101(Fe)@Ag composite substrates with high SERS performance and uniformity and establishes a rapid detection method for formaldehyde using this substrate, which has great application prospects.
研究领域:
分析化学
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纳米技术
·
材料科学
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环境科学
·
光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Dandan Ma,Diankun Sun,Yajun Zou,Siman Mao,Yixuan Lv,Yao Wang,Jun Li,Jian-Wen Shi
A series of dandelion-like Fe-CeO 2 /CdS (FeCe x /Cd y ) nanoflowers with different molar ratios of Fe-CeO 2 to CdS are synthesized by solvothermal method for the first time. The FeCe x /Cd y nanoflowers are assembled by a large number of nanoparticles with the diameter of about 3 nm, and the introduction of Fe ions and the couple of CdS quantum dots (QDs) efficiently enhanced the relative percentage of Ce 3+ in CeO 2 . The as-obtained FeCe 1 /Cd 1 heterostructure exhibits the highest photocatalytic H 2 evolution ability of 108.9 μmol/h, which is 20.5, 6.1 and 7.1 times higher than CeO 2 , Fe-CeO 2 and CdS, respectively. This significantly enhanced photocatalytic performance can be mainly attributed to the synergy between the electronic anchoring effect of Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ redox couples and the internal electric field constructed by the II-type heterojunction between Fe-CeO 2 and CdS. This work provides a new idea for the design of efficient photocatalysts by combining the advantages of heterostructure and ion anchoring effect.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenfei Yang,Xinnian Xia,Luhua Shao,Longlu wang,Yutang Liu
Herein, Ag 3 PO 4 /mixed-valence MIL-88A(Fe) [AMM] Z-scheme heterojunctions with an in-situ-generated photo–Fenton process were successfully constructed. The optimized AMM-20 heterojunctions show the maximum rate of photocatalytic TC degradation, which is 2.5 and 6.6 times of pristine Ag 3 PO 4 and MIL-88A(Fe). The electronic and band structures of Ag 3 PO 4 , MIL-88A(Fe), m-MIL-88A(Fe) and AMM heterojunctions were deeply investigated by both experimental and theoretical simulation. The Z-scheme transfer pathway greatly accelerates the transfer rate of charge carriers and effectively inhibits the photocorrosion, leading to the improvement of photocatalytic activity and photostability. Moreover, the adjustment of the Fe II /Fe III ratio of mixed-valence MIL-88A(Fe) further enhances the photocatalytic activity of the hybrid photocatalysts, benefiting from the promotion of the efficiency of the in-situ-generated photo-Fenton process. The Z-scheme transfer route coupling with an in-situ-generated photo–Fenton process was verified by the free radical trapping experiment, in-situ XPS measurement, in-situ ESR measurement, and coumarin fluorescence analysis. The degradation pathways of TC were determined through LC-MS analysis and theoretical calculation. Furthermore, the toxicity of intermediates was evaluated by QSAR prediction.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 37
·19757-19768
·
IF 14.511
Min Lu,Li An,Jie Yin,Jing Jin,Rui Yang,Bolong Huang,Yang Hu,Yong-Qing Zhao,Pinxian Xi
The electrochemical oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are key electrochemical processes in metal–air batteries and water splitting devices. Aluminium–air batteries, as an important type of metal–air battery, have been considered to be promising power candidates for flexible electronics. Here, we describe electronically engineered amorphous Fe–Co–S sites embedded in Prussian blue analogue (FeCoSx-PBA) hetero-nanoframes. The experimental results and DFT calculations reveal the critical role of the introduced FeCoSx layer to PBA, which enhances the electron transfer and alleviates the overbinding effect of OH* during the OER. The FeCoSx-PBA hybrid system supplies an optimized electronic structure for the alkaline OER, which is also confirmed by the much-lowered overpotential (266 mV at 10 mA cm−2) for the alkaline OER. Furthermore, a flexible Al–air battery based on an FeCoSx-PBA cathode catalyst exhibits a high peak power density (58.3 mW cm−2) and energy density (1483 W h kgAl−1), and outstanding stability for more than 50 h of operation under bending or stretching conditions, demonstrating its potential in the practical application of flexible electronic devices. Our results may provide a new strategy of modulating the electronic structure of air electrode catalysts to efficiently promote the reactivity of alkaline OER and Al–air battery processes.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Hongguan Li,Jing Wang,Ruijuan Qi,Yongfeng Hu,Jing Zhang,Hongbin Zhao,Jiujun Zhang,Yufeng Zhao
Charge and spin manipulations of electrons are considered to be of great significance in boosting the catalytic activity of M N C electrocatalysts. However, to the best of our knowledge, most current studies focus only on the charge engineering, the interplay between spin and charge is not well understood, and the simultaneous manipulation of both charge and spin remains challenging. Herein, we show that the cooperative interplay between charge itineration and spin-polarization of electrons has a profound impact on the catalytic behavior through density functional theory (DFT) calculations for the first time. Following this concept, we report a Fe-Ni atomic pair as a superior bifunctional catalyst for high performance ORR and OER, with a very small potential difference (ΔE) of 0.691 V. We confirm that the coexistence of Fe 3d itinerant charge and moderate spin polarization (magnetic moment: 1.48 μ B ) is responsible for the superior functional catalytic activity for the Fe Ni atomic pairs.
研究领域:
电催化
·
材料化学
·
物理化学
·
纳米催化
·
能源材料
·
计算化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Manigandan Ramadoss,Yuanfu Chen,Yang Hu,Bin Wang,Ramkumar Jeyagopal,Karpuraranjith Marimuthu,Xinqiang Wang,Dongxu Yang
The sluggish kinetics and high cost of the noble-metal based electrocatalyst for oxygen evolution reaction (OER) still seriously limits the efficiencies of water splitting. Herein, for the first time, we rationally design a porous hierarchical nanoarchitecture, constructed by ultrathin CoSe 2 embedded Fe-CoO nanosheets (CoSe 2 @Fe-CoO), which is synthesized via self-assembly hydrolysis driven in-situ synergetic selenization of Fe/Co/O/Se precursor followed by Ostwald ripening. As an OER catalyst, the porous CoSe 2 @Fe-CoO hybrid with abundant CoOOH electroactive sites delivers a small Tafel of 56.2 mV/dec with very low onset overpotential of 280 mV@10 mA/cm 2 and excellent long-term physicochemical stability till 62 h without obvious decay, which outperforms well-established benchmark electrocatalysts (RuO 2 ). The boosted OER performance of CoSe 2 @Fe-CoO nanosheets is mainly attributed to its iron-doping effect, porous nanoarchitecture, and multicomponent synergetic/interfacial effect between ultrathin cobalt (II) oxide and conductive cobalt selenide (CoSe 2 ) nanoframework. This work presents a facile construction strategy to find a nonprecious hybrid OER electrocatalyst with excellent performance and long-term stability.
研究领域:
材料科学
·
电化学
·
纳米技术
·
催化
✓ 已验证
DOI
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Run Yuan,Yihe Qin,Can He,Zichen Wang,Lu Bai,Hong Zhao,Zijian Jiang,Lingyao Meng,Xuwen He
It is important to develop a catalyst that has high catalytic activity and can improve the degradation efficiency of refractory organic pollutants in the catalytic ozonation process. In this study, Fe-Mn-Cu-Ce/Al 2 O 3 was synthesised via impregnation calcination for catalytic ozonation of bio-treated coking wastewater. The physical and chemical characteristics of the catalysts were analysed using X-ray diffraction (XRD), X-ray fluorescence spectrometry (XRF), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller nitrogen adsorption–desorption methods. The effects of catalyst dosage, pH, and reflux ratio on the degradation efficiency of wastewater were examined in laboratory-scale experiments. The chemical oxygen demand (COD) removal rate of bio-treated coking wastewater was estimated to be 52.76 % under optimal conditions. The experiments on the catalytic mechanism demonstrated that the surface hydroxyl formed by the Lewis acid sites on the surface of the catalyst can react with ozone as the active site forming the active oxygen (·OH, ·O 2 – , and 1 O 2 ), thereby efficiently degrading the organic pollutants in coking wastewater. Furthermore, a pilot-scale experiment on the catalytic ozonation of bio-treated coking wastewater was carried out using an Fe-Mn-Cu-Ce/Al 2 O 3 catalyst, while the effects of the initial pollutant concentration, ozone concentration, and gas flow on the COD removal rate were studied on a pilot scale. It was found that the COD removal rate of the wastewater was ∼ 60 % under optimal parameters. After the treatment, the wastewater steadily reached the coking wastewater discharge standard (COD < 80 mg/L), while the operating cost of catalytic ozonation reached ∼ 0.032$/m 3 , thereby paving the way toward economic engineering applications. The COD degradation kinetics in the bio-treated coking wastewater followed pseudo-second-order kinetics. Three-dimensional fluorescence and gas chromatography–mass spectrometry revealed that macromolecular organic pollutants in the bio-treated coking wastewater were greatly degraded. In summary, Fe-Mn-Cu-Ce/Al 2 O 3 exhibited good reusability, high catalytic activity, and low cost and has a wide application prospect in the treatment of coking wastewater.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Chenxuanzi Wang,Mingxuan Zhong,Yongcheng Cai,Zewei Zhang,Bo Xiao,Tingting Xu,Xun Wang
The chemical looping reforming coupled with CO 2 splitting (CLR-CS) offers a promising solution for syngas production and simultaneous decomposition of CO 2 . In this study, the Sr-Fe based oxygen carriers (OCs) were evaluated in CLR-CS using ethanol as fuel. The presence of Sr significantly improved the oxidation performance of iron oxides. The Sr element in fresh Sr-Fe based OCs mainly formed two crystal phases, including SrFe 12 O 19 and Sr 4 Fe 6 O 13 . Increasing the amount of Sr element made it easier to form Sr 4 Fe 6 O 13 crystal phase. The Sr 4 Fe 6 O 13 was favorable for syngas production, due to the higher surface oxygen vacancy formation energy with a range of 3.13–3.37 eV. However, the lower oxygen transfer capacity (OTC) of Sr 4 Fe 6 O 13 resulted in a lower CO yield in the of stage of CO 2 decomposition. Compared with Sr 4 Fe 6 O 13 , SrFe 12 O 19 exhibited the higher OTC and the higher reactivity of lattice oxygen, which was preferable to produce more CO 2 in the stage of ethanol reforming in fuel reactor. During the cycle tests, the crystalline phase of SrFe 12 O 19 didn’t regenerate under the CO 2 atmosphere but transformed into Sr 4 Fe 6 O 13 . It was attributed to the lower energy barrier of CO 2 oxidation on the oxygen defect surface of Sr 4 Fe 6 O 13 . The phase transformation of SrFe 12 O 19 accompanied the formation of Fe 3 O 4 . The excessive Fe 3 O 4 had poor stability and inactivated easily due to sintering and agglomeration in Sr1Fe4 and Sr1Fe6 samples. The Sr1Fe2, namely the molar ratio of SrO to Fe 2 O 3 of 1:2, exhibited the better performance for syngas (0.291 Nm 3 /kg OC) and CO (0.141 Nm 3 /kg OC) coproduction at 800 °C. Additionally, the Sr1Fe2 presented an excellent cyclic stability in 30 cycles due to the suitable proportion of Sr 4 Fe 6 O 13 and iron oxides formed, which maintained a high syngas yield and avoided sintering of iron oxides. Overall, the Sr1Fe2 is a promising OC candidate in CLR-CS process.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yuzhe Liu,Qi Li,Yuhan Liang,Junhao Liang,Wenliang Feng,Bin Wu,XuLei Sui,Zhenbo Wang
The inherently low active site accessibility of single-atom Fe-N-C catalysts severely compromises their catalytic activity relative to Pt-based catalysts, thereby hindering their practical implementation in critical applications. This work systematically investigates the synergistic effects of physical confinement and chemical induced growth strategy on optimizing active site accessibility of Fe-N-C catalysts for oxygen reduction reaction. Through a physical confinement strategy, the catalyst particle size is successfully reduced from the micrometer scale to the nanometer scale. Subsequently, by employing chemical-induced growth, the particle size is precisely controlled within the range of 623 nm to 421 nm, simultaneously establishing an optimal balance between the catalyst particle size threshold (420 nm) and the ordered macroporous framework. This approach maximized the accessibility of active sites and significantly enhanced the catalytic activity of the Fe-N-C catalyst. The optimized catalyst (OM-Fe-NC-4) exhibits outstanding performance, achieving a remarkable half-wave potential of 0.888 V, surpassing both commercial Pt/C and most state-of-the-art Fe-N-C catalysts. Additionally, it demonstrates excellent four-electron selectivity and delivers a kinetic current density of 14.7 mA cm −2 at 0.85 V in acidic medium. This dual-dimensional modulation strategy offers a paradigm for enhancing the accessibility of active sites for non-precious metal catalysts.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Tian Tian,Ke Zhou,Yu-Sheng Li,Dong-Feng Liu,Han-Qing Yu
Phosphorus (P) recovery from wastewater can be completed by iron-involved autotrophic denitrification via forming Fe(III)–P precipitates and/or adsorbing P onto Fe(III) oxyhydroxides. However, so far, most studies focused on the final P-containing products, while the P-capturing pathways in such a process remain unclear. In this work, autotrophic iron-dependent denitrification (AIDD) was used as a typical anoxic iron-involved P-capturing biosystem to investigate the main P recovery pathways. The AIDD biosystem showed a relatively stable capability of capturing P coupled with nitrate reduction. Direct formation of amorphous Fe(II)–P precipitates after the phosphate was fed, followed by microbially driven oxidation into Fe(III)–P minerals, was found to be the primary pathway for the P capture. In addition, adsorption of phosphate onto the formed iron oxyhydroxides also contributed to the P recovery. This work provides better understanding about recovering P in AIDD and iron-involved denitrification and highlights the important roles of iron oxidizers in the iron-related biological wastewater treatment processes.
研究领域:
环境工程
·
水处理技术
·
生物地球化学
·
环境微生物学
·
资源回收
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Su Ding,Jinquan Wan,Yan Wang,Zhicheng Yan,Yongwen Ma
In this work, persulfate (PS) activation by a novel functioned metal-organic framework catalyst was investigated for the targeted degradation of DMP, a toxic phthalate pollutant. The catalyst, a molecularly imprinted water-stable Fe-MOF-74 (Fe-MOF-74@SiO 2 @MIP), showed excellent capability of PS activation, high selectivity and efficient targeted degradation performance of DMP. The results of total organic carbon indicated that DMP was mineralized during the catalysis. EPR measurement and quenching experiments suggested the coexistence of SO 4 •− and • OH, and SO 4 •− was predominant in this system. It was found that increasing catalyst loading (0.01 - 0.05 g L -1 ) inhibited the DMP elimination, due to the aggravated radical consumption. A higher pseudo-first order rate of DMP degradation was observed with an increasement of PS (5.2 - 52 mM) and temperature (15 - 45 °C). Besides, coexisting chloride ions (Cl − ) promoted the DMP degradation at the concentration 1 mM, but decreased the degradation performance at other concentrations. According to EPR and XPS analysis, the effect of Cl − was ascribed to the formation chlorine radicals, which changed the radical distribution and the catalytic site property. Chlorinated intermediates were detected by LC-MS, confirming the involvement of Cl-related radicals. Finally, possible degradation pathways were proposed.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）