JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Zhe Yang,Xiaowen Ma,Chao Shan,Xiaohong Guan,Weiming Zhang,Lu Lv,Bingcai Pan
To activate zero-valent iron (ZVI) for efficient nitrobenzene (NB) reduction, a hybrid Fe 0 /Fe 3 O 4 /FeCl 2 microcomposite (hZVI bm ) was synthesized via simple ball-milling of the ternary mixture of ZVI, Fe 3 O 4 , and FeCl 2 ·4H 2 O (hZVI). SEM-EDX and time-of-flight secondary ion mass spectroscopy (ToF-SIMS) indicated the hZVI bm microcomposite (10–20 μm) consisted of Fe 0 core covered by ∼3.3 μm-thick shell decorated with Fe 3 O 4 /FeCl 2 fine particles (0.1–2 μm). Efficient removal (>95%) of NB (200 mg/L) was achieved by hZVI bm (2.0 g Fe/L) in 30 min over a wide pH range from 3 to 9. Notably, the NB removal efficiency of hZVI bm was over 30 times higher than the virgin ZVI or over three times higher than hZVI. The enhanced reactivity synergistically resulted from both chemical and physical aspects. Chemically, the Fe 3 O 4 /FeCl 2 -inlaid shell and the Fe(II) components played significant activation roles, as observed from the comparative experiments in their absence via pretreatments of hZVI bm by sonication and rinsing, respectively, with direct evidence of depassivation effect by XRD analysis. Physically, the ball-milling-induced inter-particle compaction effect was considered crucial to facilitate the interfacial mass/electron transfer processes during the reduction. The reduction pathway from NB to aniline via two intermediates was analyzed by liquid chromatography.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wenlong Zhang,Huanxin Li,Xiaohui Ning
The Fe/FeCl2-Graphite molten salt battery is a promising technology for large-scale energy storage, offering a long lifespan, a low operating temperature (<200 °C), and cost efficiency. However, its practical applications are hindered by the lack of a scalable preparation approach and insufficient redox stability in the Fe/FeCl2 electrode. Our study introduces an electrochemical anodic electrolysis (EAE) strategy, employing the anodic process (Fe → Fe2+) in an Al|AlCl3/NaCl/LiCl|Fe electrolysis system for the Fe/Fe2+ negative electrode in the Fe/FeCl2-Graphite battery. The EAE strategy forms an oxidized film, preventing incipient dissolution in the electrolyte and addressing redox stability issues with FeCl2 as the active substance. The Fe/Fe2+ negative electrode prepared by the EAE strategy exhibits a stabilized capacity of 0.72 mAh/cm2 after 7000 cycles at 5 mA/cm2, with a lower polarization level (∼29 mV) compared to FeCl2 as the active component. The flexibility of the EAE strategy is validated in both galvanostatic and potentiostatic processes, with a discharge capacity of 14 mAh after 1000 cycles, a capacity retention rate of 85%, and a Coulombic efficiency of 98% in the potentiostatic anodic electrolysis Fe/Fe2+ electrode. The scalability and reliability of the EAE strategy are further demonstrated in capacity-expanded Fe/FeCl2-Graphite batteries, reaching a discharge capacity of 155.1 mAh after 1000 cycles at 130 mA, with a capacity retention rate of 94%. For the first time, we showcased an EAE approach capable of producing Fe/Fe2+ electrodes at a rate of about 68.6 m2 per day. Additionally, we successfully assembled an Fe/FeCl2-Graphite battery at about a 0.42 ampere-hour level, paving the way for the scalable application of Fe/FeCl2-Graphite batteries.
研究领域:
能源材料
·
电化学
✓ 已验证
DOI
高影响因子
Friction
·
2024
·Vol. 12
·期 8
·1716-1727
·
IF 6.3
Meng Yan,Wen Xiangli,Cheng Jie,Bai Pengpeng,Meng Yonggang,Tian Yu
Most studies of liquid lubricants were carried out at temperatures below 200 °C. However, the service temperature of lubricants for aerospace and aeroengine has reached above 300 °C. In order to investigate the friction mechanism and provide data for high temperature lubrication, the friction and wear properties of chlorophenyl silicone oil (CPSO)-lubricated M50 steel and Si 3 N 4 friction pairs were investigated herein. Ball-on-disk experimental results show that the lubrication performance of CPSO varies significantly with temperature. Below 150 °C, coefficient of friction (COF) remains at 0.13–0.15 after the short running-in stage (600 s), while the COF in the running-in stage is 0.2–0.3. At 200 °C and above, the running-in time is much longer (1,200 s), and the initial instantaneous maximum COF can reach 0.5. Under this condition, the COF gradually decreases and finally stabilizes at around 0.16–0.17 afterwards. This phenomenon is mainly due to the different thickness of boundary adsorption film. More importantly, the wear rate of M50 steel increases significantly with the temperature, while the wear rate barely changes at temperatures above 200 °C. The anti-wear mechanism is explained as tribochemical reactions are more likely to occur between CPSO and steel surface with the increased temperature, generating the FeCl 2 protective film on the metal surface. Accordingly, FeCl 2 tribochemical film improves the lubrication and anti-wear capacity of the system. At high temperatures (200–350 °C), FeCl 2 film becomes thicker, and the contact region pressure becomes lower due to the larger wear scar size, so the wear rate growth of M50 steel is much smaller compared with that of low temperatures (22–150 °C). The main findings in this study demonstrate that CPSO lubricant has good anti-wear and lubrication capacity, which is capable of working under temperatures up to 350 °C.
研究领域:
材料科学
·
摩擦学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Weijun Zhang,Fen Li,Zhinan Fu,Sheng Dai,Fenghongkang Pan,Jinxia Li,Lihui Zhou
The appearance of mixed-metal MOF materials with abundant metal active sites, high porosity, large surface area, and, particularly, the synergistic effect between different metals which show prominent catalytic activity for oxygen evolution reaction (OER) has motivated profound research. Most of the related reports focus on the hydrothermal methods to prepare the mixed-metal MOFs containing metal ions such as Co, Ni, and Cr, etc. In this work, we proposed a facile impregnation method through an ion-exchange process to fabricate Fe-doped Co-BDC nanosheets (Fe@Co-BDC NSs) that represented significant enhancement for electrocatalytic OER. The tuning mechanism of the ion-exchange method was investigated by the morphology change and electronic structure of Fe@Co-BDC NSs, which should be important for an efficient OER catalyst. The optimized Fe@Co-BDC NSs (5 mM, 60 min) exhibited a significantly lower overpotential of 307 mV with a smaller Tafel slope of 34.1 mV·dec–1, as compared with the pure Co-BDC NSs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Lantong Gou,Xiandong Hao,Zhiyong Xu,Wenbo Zhao
Nitric oxide (NO), a major air pollutant from coal-fired power plants, demands an efficient capture for environmental and industrial applications. Ferrous-based absorbents exhibit promising potential for NO capture due to rapid Fe2+-NO complexation. Herein, a novel nonaqueous FeCl2/PEG200 mixture absorbent was designed by employing FeCl2 as the Fe2+ source and PEG200 as the solvent. The FTIR/UV–vis spectrum confirmed Fe2+-NO complex formation and suggested possible reaction mechanisms. Dynamic sorption experiments were systematically conducted to evaluate sorption performance. Kinetic and thermodynamic analyses obtained activation energy, enthalpy change, and entropy change information. Most importantly, a new sorption kinetic model has been established, which can be used to predict the NO sorption capacity at any temperature and partial pressure. Cyclic sorption─desorption testing demonstrated a high desorption efficiency (>91%) and robust cyclic stability over 4 consecutive cycles. This work establishes the FeCl2/PEG200 system as an efficient, reusable, and scalable candidate for industrial NO capture.
研究领域:
环境工程
·
化学工程
·
工业化学
·
大气污染控制
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS AND CHEMISTRY OF MINERALS
·
2024
·Vol. 51
·期 2
·1-10
·
IF 1.2
Yao Yao,Liu Xi,Du Xueyan,Zhang Lili,Yuan Hongsheng
Iron hydroxide FeO 2 H x ( x ≤ 1) and ferrous iron chloride FeCl 2 can adopt the HP-PdF 2 -type (space group: \(P{a_{\overline 3 }}\) , Z = 4) structure in the lowermost mantle, potentially contributing to the geochemical cycles of hydrogen and chlorine within Earth’s deep interior, respectively. Here we investigate the high-pressure behavior of HP-PdF 2 -type FeCl 2 by X-ray diffraction (XRD) and Raman measurements in laser-heated diamond anvil cells. Our results show that HP-PdF 2 -type FeCl 2 can be formed at 60‒67 GPa and 1650‒1850 K. Upon cold decompression, the diffraction peaks at pressures above 10 GPa can be indexed to the HP-PdF 2 -type structure. Intriguingly, the calculated cell volumes reveal a remarkable decrease of Δ V / V = ∼ 14% between 36 and 40 GPa, which is possibly caused by a pressure-induced spin transition of Fe 2+ (HS: high-spin → LS: low-spin). We also observe distinct changes in Raman spectra at 33‒35 GPa, practically coinciding with the onset pressures of isostructural phase transition in XRD results. Our observations combined with previous studies conducted at megabar pressures suggest that HP-PdF 2 -type FeCl 2 , with a wide pressure stability range, if present in subducting slabs, could facilitate the transport of chlorine from the middle lower mantle to the outer core.
研究领域:
地质学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 19
·7952-7959
·
IF 4.177
Qiao Sun,Min Liu,Keyan Li,Yitong Han,Yi Zuo,Junhu Wang,Chunshan Song,Guoliang Zhang,Xinwen Guo
A series of MIL-53(Fe)-type materials, Fe(BDC)(DMF,F), were prepared by using different ratios of n(FeCl3)/n(FeCl2), which have varied amounts of Fe2+ in their frameworks. From FeCl3 to FeCl2, the structures of the synthesized samples transform from MIL-53(Fe) to Fe(BDC)(DMF,F). Along with this structure transformation, the crystal morphology goes through a striking change from a small irregular shape to a big triangular prism. This phenomenon indicates that the addition of FeCl2 is beneficial for the formation of a Fe(BDC)(DMF,F) structure. The catalytic activity of these iron-containing MOFs was tested in phenol degradation with hydrogen peroxide as an oxidant at near neutral pH and 35 °C. The degradation efficiency of these samples increases gradually from MIL-53(Fe) to Fe(BDC)(DMF,F). 57Fe Mössbauer spectra reveal that Fe2+ and Fe3+ coexist in the Fe(BDC)(DMF,F) framework, and the highest amount of Fe2+ in the sample prepared with mixed FeCl3 and FeCl2 is 26.0%. The result illustrates that the amount of Fe2+ in the samples can be controlled using varied n(FeCl3)/n(FeCl2) in the feed. The diverse amount of Fe2+ in this series of FeMOF materials exactly explains the distinction of reaction efficiency. The iron leaching tests, structures of the fresh and used catalysts, and the data of the recycling runs show that the Fe-containing MOFs are stable in this liquid-phase reaction.
研究领域:
材料科学
·
环境化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Shuaifeng Liu,Edouard Asselin,Zhibao Li
The disposal of titanogypsum, also known as red gypsum, which is generated during the titanium dioxide sulfate process, has become a significant environmental challenge. We propose a new process to recover iron impurities such as FeCl2·4H2O and to convert titanogypsum to saleable hemihydrate gypsum. For this purpose, we use HCl–FeCl2 solution generated via the reaction of H2SO4–FeSO4 with CaCl2 to leach iron hydroxide from titanogypsum. The hemihydrate precipitation and phase-transition kinetics of the reaction of HCl–H2SO4–FeSO4 with CaCl2 are experimentally investigated at 353 K. The common ion effect of CaCl2 in the FeCl2 solution for FeCl2·4H2O crystallization is predicted by NRTL modeling of the solid–liquid equilibria of the FeCl2–CaCl2–H2O system. High-quality, saleable α-gypsum and FeCl2·4H2O solids obtained by treating titanogypsum samples provided by a commercial processing plant further shows that the new process is feasible.
研究领域:
环境科学
·
化学工程
✓ 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）