SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Meichao Gao,Dafeng Zhang,Xipeng Pu,Hong Li,Wenzhi Li,Xin Shao,Dongdong Lv,Bingbing Zhang,Jianmin Dou
Fe-doped BiOCl photocatalysts were synthesized by a simple combustion method. The as-synthesized catalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy and UV–Vis diffuse reflectance spectroscopy. Fe 3+ doping leads to red-shift in the absorption band and increased visible light absorption. The photocatalytic reaction tests in the degradation of the dyes of rhodamine showed that the doping of Fe 3+ could bring about a big increase in the photocatalytic activity under visible light irradiation. The main reactive oxygen species and photocatalytic mechanism of Fe-doped BiOCl under visible light irradiation were discussed in detail.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Shi-Wen Lv,Jialu Pan,Xiaoran Wang,Yifan Shao,Yanqing Cong,Lin Che
It is of great significance to establish an effective method for removing Cr(VI) from wastewater. Herein, Fe-doped g-C 3 N 4 (namely Fe-g–C 3 N 4 –2) was synthesized and then employed as photocatalyst to conduct the test of Cr(VI) reduction. Notably, the embedding of Fe ion in g-C 3 N 4 can offer the Fe 2+ /Fe 3+ redox couples, so reducing the interfacial resistance of charge transfer and suppressing the recombination of photogenerated electrons and holes. The impurity energy levels will form in g-C 3 N 4 after the introduction of Fe ion , thereby boosting the light absorption capacity of catalyst. Thus, Fe-g–C 3 N 4 –2 showed good performance in photocatalytic Cr(VI) reduction, and the reduction efficiency of Cr(VI) can reach 39.9% within 40 min. Different with many previous studies, current work unexpectedly found that the addition of p -benzoquinone (BQ) can promote the Cr(VI) reduction, and the reduction efficiency of Cr(VI) over Fe-g–C 3 N 4 –2 was as high as 93.2% in the presence of BQ (1.5 mM). Further analyses showed that BQ can be reduced to hydroquinone (HQ) by photogenerated electrons, and UV light can also directly induce BQ to generate HQ by using H 2 O as the hydrogen donor . The HQ with reducing ability can accelerate the Cr(VI) reduction. In short, current work shared some novel insights into photocatalytic Cr(VI) reduction in the presence of BQ. Future research should consider possible reactions between photogenerated electrons and BQ. For the UV-induced photocatalysis , the suitability of BQ as the scavenger of O 2 •‒ must be given carefully consideration.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Xi Zhang,Lingling Ren,Liang Sun,Zhuobin Huo,Bangjie Tan,Nengjie Feng,Hui Wan,Guofeng Guan
Manganese oxides were received extensive attention on account of its low cost, variable valence state and excellent redox properties. Herein, we successfully prepared various Fe-doped MnO 2 catalysts to further improve the catalytic activity of MnO 2 on propane. Physicochemical characterization results displayed that with the increase of Fe doping amounts, the crystalline phase of MnO 2 gradually changed from α-MnO 2 and β-MnO 2 to Fe 2 O 3 , the particle size of catalysts decreased and the specific surface area increased. However, increasing the content of Fe could not monotonically enhance the catalytic performance of catalysts on propane. When the molar ratio of Fe/Mn was 0.25, the largest amount of Mn 4+ species and lattice oxygen species were exposed on the surface of Mn8Fe2, and showed the best low temperature reducibility , which was ascribed to the synergistic effect between Mn and Fe was enhanced. It presented optimal catalytic activity for propane oxidation with temperature of propane conversion at 90% (T 90 ) as low as 279 °C under 0.1% propane and 5% O 2 . This work provided a new way to design and synthesize efficient non-noble metal catalysts for the elimination of propane, which had certain application value.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jun Liao,CongCong Ding,Liang Jiang,Junping Shi,Qiuyi Wang,Zihao Wang,Lielin Wang
In this work, Fe 3+ -doped and -NH 2 -grafted montmorillonite-based material was prepared and the adsorption ability for uranium(VI) was verified. The microstructure and pore size distribution of the montmorillonite-based material were investigated by N 2 adsorption-desorption analyzer and scanning electron microscopy. The surface groups and composition were analyzed by Fourier transform infrared spectrometer, X-ray photoelectron spectrometer and X-ray diffractometer, which proved the successful doping of Fe 3+ and grafting of -NH 2 . In the adsorption study, the adsorption reached equilibrium within 100 min with a maximum adsorption capacity of 661.2 mg/g at pH = 6 and a high adsorption efficiency of 99.4 % at low uranium(VI) concentration (pH = 6, m/V = 0.5 g/L). The mechanism study showed that the strong synergistic complexation of -OH and -NH 2 for uranium(VI) played a decisive role in the adsorption process and the transport function of interlayer bound water could also enhance the adsorption probability of uranium(VI) species. These results were far superior to other reported similar materials, which proved that the Fe 3+ -doped and -NH 2 -grafted montmorillonite-based material possessed an extremely high application potential in adsorption, providing a new route for the modification of montmorillonite.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yuchun Ren,Dandan Zhao,Chen Fu,Fei Zhou,Qian Wang,Yongsheng Fu,Tao Gong,Zhenglian Wu
Sustainable lithium-based energy storage and conversion systems, such as lithium-ion batteries, rely on efficient lithium extraction methods from brine sources. Traditional H 2 TiO 3 (HTO) lithium-ion sieves (LIS), though effective, face challenges in optimizing lithium adsorption efficiency and stability. Herein, we introduce a Fe-doping strategy in HTO (Fe-HTO) that artificially substitutes Ti sites, generating lattice defects and oxygen vacancies (OVs). This modification enhances lithium-ion diffusion kinetics and increases active adsorption sites, significantly improving selective lithium extraction efficiency. With Fe-HTO, the equilibrium adsorption time for lithium-ion in shale gas wastewater (SGW), with pH adjustment to 12, is reduced by 20 h compared to undoped HTO. Fe-HTO reaches an adsorption capacity of 37.20 mg/g within 4 h and retains 99.2 % of this capacity after 10 adsorption/desorption cycles at room temperature, demonstrating high structural stability. Density functional theory (DFT) calculations clarify that Fe doping lowers the diffusion energy barrier for lithium-ion, accelerating both lithium-ion diffusion and adsorption. Given this, the work illustrates the potential of heteroatom doping to boost adsorption kinetics, offering promising applications for rapid lithium extraction and similar resource recovery challenges.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Yu Guan,Yinhe Liu,Qiang Lv,Bo Wang
The selective catalytic reduction of nitrogen oxides (NO x ) by carbon monoxide (CO-SCR) is a promising way to deal with exhaust gasses. And Effective redox cycle and NO dissociation ability are crucial factors for catalytic reduction of NO x . Herein, Fe decorated CeO 2 microsphere catalysts with surface oxygen defect were synthesized by solvothermal and calcination method. Among all catalysts, 0.5Fe-CeO 2 sample showed excellent catalytic performance with efficiency near 96% for NO reduction under the condition of 550 ppmv NO, 1200 ppmv CO, and 40,000 h − 1 of GHSV. It was found that Fe doping could efficiently regulate Ce 4+ /Ce 3+ redox couple and oxygen vacancy for catalytic activity. XRD, Raman, XPS, EPR and H 2 -TPR etc. were employed to explore the physicochemical properties of samples. The results showed that Fe had been incorporated into CeO 2 by XRD, and the results of Raman spectrum and XPS indicated that Ce 4+ /Ce 3+ redox couple existed in 0.5Fe-CeO 2 catalyst. Furthermore, the H 2 -TPR spectrum displayed the formation of oxygen vacancy in the samples. N 2 adsorption-desorption isotherms indicated that the doping of Fe could enlarge the specific surface area, pore volume and pore dimeter of the samples, and thus greatly enhanced the NO adsorption and further NO catalytic reduction on catalysts. In addition, other characterization of physicochemical properties and density functional theory (DFT) calculation were performed to reveal the mechanism of NO + CO reaction. As a result, a mechanism was proposed to elucidate highly efficient NO reduction over the catalysts of Fe decorated CeO 2 microspheres. Finally, the synergistic effects of redox center and oxygen vacancy on catalytic activity enhancement were revealed. This work provides a promising way to the design of efficient catalysts for NO reduction.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shaoqi Zhang,Haiyang Yu,Yi Wang,Yuxiang Yan,Jun Dai,Dajun Shu,Xinglong Wu
CO2 possesses extraordinary thermodynamic stability, and its reduction reaction involves multiple electron-transfer processes. Thus, high-density electron occupation on a catalyst surface is an effective driving force for improving the photocatalytic activity. Here, we report on the fabrication of Fe-doped Bi2O3 catalysts (denoted as FexBi2-xO3) with different Fe contents using the solvothermal method. The self-assembled catalyst has a nanoflower-like morphology, and its performance of CO2 reduction to CO is improved largely dependent on the Fe content. In the sample with a 7.0% Fe content (Fe0.07Bi1.93O3), the CO evolution rate reaches 30.06 μmol g–1 h–1, which is about 6 times higher than the 4.95 μmol g–1 h–1 of pristine Bi2O3, and shows excellent photostability after three cycles, with each cycle lasting for 7 h. Theoretical calculation and spectral characterization reveal that such a good CO2 reduction reaction performance arises from effective surface occupation of Fe, which not only enhances sunlight absorption but also significantly increases the surface electron density on the double metal active sites. This work provides a new strategy for improving the photocatalytic performance by surface metal doping in some metal oxide photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Liyuan Liu,Guanfu Liu,Shibo Wu,Jiahao He,Yang Zhou,Muslum Demir,Ruona Huang,Zijin Ruan,Guohua Jiang,Pianpian Ma
Sr-based perovskites represent enormous potential as supercapacitor electrode materials. However, the wide-temperature supercapacitor application for perovskite-based electrodes has not been studied yet. Thus, there is a pressing need for comprehensive research and investigation in the wide-temperature range to unlock the full capabilities of Sr-based perovskite and pave the way for its successful integration into versatile supercapacitor systems. In this study, SrCo 1- x Fe x O 3-δ ( x = 0.05, 0.10, 0.15 and 0.20) were synthesized by solid-state sintering method, as oxygen-intercalated electrode materials for wide temperature-tolerant supercapacitors. SrCo 1- x Fe x O 3-δ contains orthogonal and monoclinic phases for x = 0.05 and x = 0.10, and a stable monoclinic phase can be obtained when the substitution amount is at least 15 %. The best electrochemical performance was obtained in x = 0.10, with a specific capacitance of 526.6 F g −1 at 1 A g −1 . This can be attributed to the lowest resistance and richest oxygen vacancies of SrCo 0.9 Fe 0.1 O 3-δ , which are conducive to oxygen-intercalated energy storage. The SrCo 0.9 Fe 0.1 O 3-δ @CC//AC@CC supercapacitor device displays a working voltage of 1.6 V and a stable long-term cycle life with 85.71 % capacity retention after 5000 cycles. Furthermore, the temperature-dependent electrochemical characterization indicates an improvement of electrochemical performance for both electrode and device as temperature increases, which may be ascribed to the enhanced ion migration in the electrolyte. From 0 to 85 °C, the specific capacitance of SrCo 0.9 Fe 0.1 O 3-δ @CC electrode increases from 91.8 to 1035.9 F g −1 at 1A g −1 , and the energy density of the device also increases from 7.6 to 26.2 Wh kg −1 when the power density is 800 W kg −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Min Wang,Shu Zhang,Qi Li,Yuanpeng Li,Enzhe Duan,Caimei Wen,Shujun Yu,Xiangxue Wang
Extracting uranium from seawater not only reduces radioactive contamination in seawater but also provides a source of uranium energy. However, due to the low concentration of uranium in seawater and the high salinity of seawater, extraction of uranium from seawater is challenging. In this work, we demonstrated a simple strategy to synthesize Fe-doped MXene (Fe@Ti 3 C 2 T x ) via a hydrothermal method and applied for uranium enrichment in seawater. The Fe@Ti 3 C 2 T x exhibited excellent adsorption performance in high salinity environments. The removal capacity of Fe@Ti 3 C 2 T x was determined to be 526.6 mg/g for UO 2 (CO 3 ) 2 2− at 328 K with quick reaction equilibrium (∼ 30 min). Kinetic and thermodynamic analyses of UO 2 (CO 3 ) 2 2− elimination process on Fe@Ti 3 C 2 T x surface revealed it to be a spontaneous and endothermic single-phase elimination process. FT-IR and XPS analyses further indicated that the removal mechanism of UO 2 (CO 3 ) 2 2− by Fe@Ti 3 C 2 T x was surface complexation. Our study suggests that Fe@Ti 3 C 2 T x can provide a feasible solution for uranium enrichment in seawater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Jiangbo Shi,Guiqiu Chen,Guangming Zeng,Anwei Chen,Kai He,Zhenzhen Huang,Liang Hu,Jingwen Zeng,Jing Wu,Weiwei Liu
In this study, graphene wrapped Fe-doped TiO 2 (G-TiO 2 -Fe) spheres were prepared through a simple hydrothermal process. The structural, optical and photocatalytic properties of synthesized composite were characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction ( XRD), Raman Microprobe (Raman), X-ray photoelectron spectroscopy (XPS) and UV–Vis diffuse reflectance spectrophotometer (DRS). The G-TiO 2 -Fe composite showed a significant red-shift in light response edge as compared with TiO 2 . Meanwhile, the band gap exhibited an obvious decline from 3.24 to 2.99 eV. The photocatalytic capacity of G-TiO 2 -Fe was further evaluated by methylene blue (MB) degradation experiments, and the results indicated that the optimized G-TiO 2 -Fe exhibited a remarkable increase in photocatalytic activity. The superior photocatalytic performance of the novel material could be ascribed to the synthetic effects of doped Fe and wrapped graphene shells. The unique geometrical configuration and constructive component which modified the TiO 2 electronic structure will largely improve the electron transporting efficiency and restrain the electron-hole recombination.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Chinese Physics B
·
2020
·Vol. 29
·期 12
·127801
·
IF 1.223
Yue Sun,Fenqi Du,Donghang Xie,Dongmei Yang,Yang Jiao,Lichao Jia,Haibo Fan
Iron (Fe) was successfully doped in CuWO4 photoanode films with a combined liquid-phase spin-coating method via the dopant sources of Fe(NO3)3, FeSO4 and FeCl3. The microstructure of the prepared films was characterized by x-ray diffraction, scanning electron microscopy, and atomic force microscopy. The light absorption and photoelectric conversion properties were evaluated by the UV-visible absorption spectra and monochromatic incident photon-to-electron conversion efficiency. The chemical composition and element combination of the samples were examined by x-ray photoelectron spectroscopy. A linear sweep voltammetric and stability test (I–t) were performed with an electrochemical workstation. The results show that the samples are uniform with a thickness of approximately 800 nm and that the photoelectrochemical performance of the doped films is heavily dependent on the Fe source and dopant concentration. Upon optimizing the doping conditions of Fe(NO3)3 and the optimal source, the photocurrent density in the Fe-doped CuWO4 photoanode film is improved by 78% from 0.267 mA/cm2 to 0.476 mA/cm2 at 1.23 V vs reversible hydrogen electrode. The underlying causes are discussed.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 12
·2109891
·
IF 18.808
Ganghong Liu,Zehao Zhang,Cuncun Wu,Yuqing Zhang,Xiangdong Li,Wenjin Yu,Guangjie Yao,Shiming Liu,Jun-jie Shi,Kaihui Liu,Zhijian Chen,Lixin Xiao,Bo Qu
The toxicity of lead-based halide perovskites hampers broad application in optoelectronics. Lead-free perovskite Cs 2 AgBiBr 6 is considered a promising candidate, owing to the long carrier lifetime and great stability. However, the relatively large bandgap of 1.98 eV limits its absorption in the visible region. Herein, Fe 2+ is chosen as the dopant to alloy into Cs 2 AgBiBr 6 single crystals, and results in an absorption range broadening to ≈1350 nm, which is the longest near-infrared (NIR) response recorded among lead-free perovskites. About 1% of Fe ions are alloyed into the Cs 2 AgBiBr 6 lattice to cause lattice shrink age. Instead of narrowing the bandgap, Fe doping would introduce a new intermediate band inside the pristine bandgap of Cs 2 AgBiBr 6 to strongly absorb NIR light, as confirmed by third harmonic generation results. Moreover, considerable photogenerated carriers are produced in Fe doped Cs 2 AgBiBr 6 crystals with NIR irradiation. This work has provided a new way to extend the optical response of lead-free perovskites for NIR photodetectors and intermediate band photovoltaics.
研究领域:
材料科学
·
光电子学
✓ 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）