WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 85
·期 10
·2797-2810
·
IF 2.43
Chen Diwei,Zheng Zhiyan,Zhang Feiji,Ke Rufu,Sun Nan,Wang Yonghao,Wang Yongjing
With increased demand for various chemical raw materials, sudden pollution incidents are more prone to occur during their transportation and usage, threatening the environment and human health. In this study, discarded tea stalks were recycled into composite materials (FSC-X00: X represents the calcination temperature) by impregnating tea stalks in Fe 2+ solution combined with subsequent calcination. X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) patterns verified the existence of Fe 0 and Fe 2 O 3 , and Fe 2 O 3 was gradually reduced to Fe 0 when the calcination temperature was raised from 700 °C to 900 °C. FSC-X00 was adopted as a heterogeneous catalyst for activating H 2 O 2 to quickly degrade phenol in the water system. The degradation experiments indicated that FSC-600 exhibited superior degradation performance for phenol (20 mg/L) within 5 min and 80% total organic carbon (TOC) removal rate at pH = 3 within 30 min. The effects of the calcination temperature, the pH value and the amount of H 2 O 2 on the degradation efficiency were investigated. Competing experiments showed that fulvic acid (FA) and inorganic salts Na + had little effect on the degradation performance. The FSC-600 catalyst can be reused by thermal reduction. In addition, it was found that FSC-600 has a good degradation effect on ciprofloxacin (CIP), norfloxacin (NOR) and enrofloxacin (ENR), indicating that FSC-600 catalysts are a promising candidate for quick degradation of organic pollutants by Fenton reaction. Electron paramagnetic resonance (EPR) spectra analysis indicated that •OH is the dominant reactive oxygen species (ROS) and part 1 O 2 from O 2 also participated in the degradation. This study provides an example of creating catalysts from organic solid waste for use in emergency treatment for phenol. Fe@Fe 2 O 3 -loaded biochar (FSC-600) was prepared by waste tea stalks and FeSO 4 combined with calcinations. FSC-600-H 2 O 2 exhibited superior degradation performance for phenol, ciprofloxacin, norfloxacin and enrofloxacin in a short period. Mechanism analysis indicates that •OH is the dominant ROS and a little 1 O 2 from O 2 also participated the degradation.
研究领域:
环境科学
·
化学工程
·
材料科学
·
废水处理
·
催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Wenjuan Shen,Bingning Wang,Falong Jia,Zhihui Ai,Lizhi Zhang
In general, the final product of atrazine (ATR) degradation by reactive oxygen species is cyanuric acid bearing a stable s -triazine ring, which is not further oxidized under mild conditions. In this study, we demonstrate that the presence of Ni(II) can increase the aerobic ATR degradation rate of core–shell Fe@Fe 2 O 3 nanowires (CSFN) by 6 times and also achieve the cleavage of recalcitrant s -triazine ring. The cleavage of s -triazine ring in this novel system was confirmed by the measurements of formic acid and nitrite acid. On the basis of experimental results, a feasible mechanism was proposed to account for the promoted aerobic ATR degradation and the facile s -triazine ring cleavage as follows. First, Ni(II) adsorbed on the surface of CSFN was reduced to nickel metal, which favored the generation of active hydrogen (•H). The in-situ generated •H then reduced ATR to 4-ethylamino-6-isopropylamino-1,3,5-triazine intermediate of easy ring opening property, rather than the recalcitrant cyanuric acid. Finally, this ATR degradation pathway change promoted the aerobic ATR degradation and benefited the s -triazine ring cleavage. This study clarifies the importance of degradation pathway on the ring-opening of organic pollutants, and also provides a mild method to remove s -triazine herbicides with molecular oxygen and zero-valent iron.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·
IF 2.9
Ruiqi Shao,Yingjie Dong,Qingqing Wu,Haiting Shi,Jinxi Bao,Feng Tian,Tianyu Li,Zhiwei Xu
The porous structure of composite nanofibers plays a key role in improving their electrochemical performance. However, the dynamic evolution of pore structures and their action during ion intercalation/extraction processes for negative electrodes are not clear. Herein, porous carbon composite nanofibers (Fe@Fe2O3/PCNFs) were prepared as negative electrode materials for potassium-ion batteries. Electrochemical test findings revealed that the composites had good electrochemical characteristics, and the porous structure endowed composite electrodes with pseudo-capacitive behaviors. After 1500 discharge/charge cycles at a current density of 1000 mA g−1, the specific capacity of the potassium-ion batteries was 144.8 mAh g−1. We innovatively used synchrotron small-angle X-ray scattering (SAXS) technique to systematically investigate the kinetic process of potassium formation in composites and showed that the kinetic process of potassium reaction in composites can be divided into four stages, and the pores with smaller average diameter distribution are more sensitive to changes in the reaction process. This work paves a new way to study the deposition kinetics of potassium in porous materials, which facilitates the design of porous structures and realizes the development of alkali metal ion-anode materials with high energies.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·5168-5178
·
IF 9.5
Liu Yu,Xie Dehui,Shi Yuxin,Lv Rongguan,Chang Yingna,Sun Yuzhen,Zhao Zhiyuan,Wang Jindi,Song Kefan,Wu Huayu,Hoang Tuan K. A.,Xing Rong,Pang Huan
Aqueous rechargeable batteries (ARBs) are generally safer than non-aqueous analogues, they are also less-expensive, and more friendly to the environment. However, the inherent disadvantage of the narrow electrochemical window of H 2 O seriously restricts the energy density and output voltage of ARBs, especially aqueous rechargeable Fe-based batteries. Herein, we introduce a new battery system: the anode contains C@Fe/Fe 2 O 3 composite, which is interfaced with an alkaline electrolyte; the cathode contains LiMn 2 O 4 in contact with a neutral electrolyte. A Li + -conducting membrane is carefully selected to decouple the electrode-electrolyte, which effectively widens the electrochemical window to above 2.65 V, thereby enables an aqueous rechargeable iron battery. Its average output voltage is 1.83 V and its energy density is 235.3 Wh/kg at 549 W/kg. In this work, we propose the energy storage mechanism with the aid of density functional theory (DFT). The calculated reduction potential of the anode agrees with the experimental value. Furthermore, this battery system demonstrates long cycle lifespan of approximately 2500 cycles at 2 A/g, corresponding to a capacity retention of 82.1%. These results are very far superior than those of mainstream aqueous rechargeable Fe-based batteries, which guarantee future investigation for storing electricity energy.
研究领域:
储能
·
电化学
·
材料科学
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiaowei Ma,Lin Tan
Metal–organic frameworks (MOFs)-derived compounds exhibit tremendous potential for applications in the field of microwave absorption, attributed to their unique structural characteristics, high specific surface area, and tunable magnetic and dielectric properties. However, their practical application in the microwave absorption field is limited by poor impedance matching. To address this issue, we successfully synthesized a composite microwave-absorbing material, labeled as Fe/Fe2O3/C/N,SGPE, by introducing heteroatom (N and S) codoped graphene (labeled as N,S-GPE) into an Fe/Fe2O3/C MOF derivative and employing a solvothermal method followed by subsequent pyrolysis. The introduction of N and S codoped graphene introduces defects and disordered structures, thereby enhancing interface and dipolar polarization processes, which in turn improve the dielectric properties and optimize impedance matching. The experimental results demonstrate that when the addition amount of N,S-GPE is 0.15 g, the material exhibits a maximum reflection loss of -62.8 dB at 7.6 GHz with a thickness of 3.09 mm, capable of absorbing over 99.9999% of microwaves. Consequently, this composite stands out as a promising candidate for high-efficiency microwave absorbers.
研究领域:
微波吸收材料
·
纳米复合材料
·
材料科学
·
电磁干扰屏蔽
·
碳基材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 10
·2577-2586
·
IF 3.4
Shili Yan,Jiamei Zhu,Hongmin Wang,Bingqian Liu,Qinling Bi
BACKGROUND Heavy oil has the characteristics of high viscosity and low American Petroleum Institute gravity, which makes it difficult to transport and produce. The key to efficiently utilizing heavy oil is reducing viscosity and improving quality. Hydroconversion has the advantages of viscosity reduction and decreased coke production, but it is difficult to separate nonmagnetic catalysts from the reaction system, which affects the industrial application. RESULTS A spherical Fe 3 O 4 (74.71 emu g −1 ) and a chain Fe Fe 2 O 3 (110 emu g −1 ) were prepared as magnetic cores, and coated with SiO 2 and Al 2 O 3 layers, respectively. The metal-supported catalyst modified with Co and Ni show irregular and honeycomb-shaped surfaces, and the magnetic saturation strength decreases to 24.91 and 14.63 emu g −1 , but still possessing superparamagnetic properties, enabling the catalysts to be separated from the reaction mixture. Fe-Fe 2 O 3 @SiO 2 @Al 2 O 3 @CoNi catalyst has the best viscosity reduction effect for Canadian oil sands asphalt residue at about 410 °C and 10 MPa hydrogen pressure. The viscosity of the liquid product decreased significantly from 56 600 to 135 mPa s at 50 °C, with a viscosity reduction of 99.8%. CONCLUSION Magnetic catalyst prepared from chain-like Fe-Fe 2 O 3 has an excellent honeycomb structure, which can provide increased active surfaces and exhibit improved viscosity reduction performance. This work provides a strategy for the recovery of heavy oil hydrogenation catalysts and is expected to play a key role in the practical application of heavy oil hydrogenation catalytic viscosity reduction. © 2023 Society of Chemical Industry.
研究领域:
化学工程
·
催化
·
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hao Wang,Xiaocao Cheng,Fengxiang Yin,Biaohua Chen,Tianyu Fan,Xiaobo He
A urea/carbon nanotubes (CNTs)-decorated metal-organic gel(Fe) was used as self-sacrifice precursors to prepare nano-sized Fe-Fe 2 O 3 @N-doped-C(NC) particles scattered on N-doped CNTs (NCNTs) through pyrolysis at 700 °C in N 2 . The particles with average size of ∼10 nm have core@shell structures with Fe-Fe 2 O 3 cores and NC shells, and the Fe-Fe 2 O 3 cores effectively connect with the NCNT scaffolds via the NC shells. Such a unique structure makes the material a superior oxygen reduction catalyst with an early onset potential (0.92 V), an early half-wave potential (0.72 V), a high current retention (91.7%, after 20,000 s), and good methanol tolerance in an alkaline electrolyte, enabling the catalyst the best among the developed Fe-FeO x oxygen reduction catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Li Lin,Fangjie Zhang,Xing Hou,Linlin Wang,Weijie Wu,Longfei Wang,Yi Li,Haijiao Xie
The advanced oxidation processes based on the electro-Fenton reactions show great potentials as a wastewater treatment approach for removing emerging contaminants. In the electro-Fenton system, some factors still exist affecting the treatment efficiency, e.g., the formation of iron sludge, a narrow pH working range, and slow conversion rates between Fe 2+ and Fe 3+ . In this research, a novel heterogeneous flow-through electro-Fenton system was constructed, and carbon felt was used as the template material for the preparation of an etched carbon felt cathode loaded with zero-valent iron and iron oxide (Fe@Fe 2 O 3 /ECF) for the degradation of bisphenol A , which addressed the aforementioned issues. The Fe@Fe 2 O 3 /ECF electrode showed excellent performance across a pH range between 3 and 11, with exceptional stability and resistance to other substances in water. For the three pollutants, bisphenol A, tetracycline and ciprofloxacin, the highest degradation efficiency can reach 99.3 %. Compared to traditional electro-Fenton systems, the novel process exhibited superior performances due to synergistic effects from feasible flow design, enhanced electrochemical reactivity and greater exposure of active sites. Through electron spin resonance and free-radical quenching experiments, it was determined that the primary species participating in the heterogeneous electro-Fenton process were the hydroxyl radical and superoxide anion. Specifically, the hydroxyl radical was identified as playing a pivotal role in the degradation of bisphenol A. After a continuous operation of 240 min, the electrode showed low metal ion leaching rate and good stability, with the concentrations of leached Fe and Co ions to be only 17 and 7 μg/L, respectively. Meanwhile, the removal efficiency was only decreased by 5.7 % during the process. Through density functional theory calculation and intermediate product analysis, three potential degradation pathways were proposed, with the cleavage of carbon bonds serving as the main degradation approach. The toxicity analysis demonstrated that the intermediates were generally less toxic than BPA during treatments. This research provides a fresh means for promoting a valence state cycling of ferric species in electro-Fenton system, which has potential applications in wastewater treatment containing emerging contaminants.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Min Jiang,Xiangyu Wang,Renchan Han,Ping Ning,Iseult Lynch,Jun Ma
A S-scheme Fe/Fe 2 O 3 @CBO photocatalyst was synthesized via a grinding calcination method, proficiently degrading tetracycline via radicals and non-radical. The reaction rate of Fe/Fe 2 O 3 @CBO-20 was recovered to 0.0255 min −1 that is 4.3 and 7.3 times as many as pristine Fe/Fe 2 O 3 and CBO after introducing visible light at the degradation process. The characterization outcomes also bear out that the S-scheme heterojunction is formed by passivation layer Fe 2 O 3 and CBO, which enhances the visible light responsiveness of catalyst and promotes the separation and transfer of photogenerated electrons to generate h + and O 2 − . Meanwhile, the molecular oxygen is more easily activated to form H 2 O 2 due to the strong reduction potential of the CB (−1.21 eV), further to facilitate the transformation of O 2 − to 1 O 2 . And the carriers excited in CBO activate Cu + , forming a Cu/Fe dual-metal electron cycle. The generated Fe 2+ reacts with H 2 O 2 to establish photocatalysis-self-Fenton system to generate ·OH. Additionally, the high TC removal in simulated aquatic environment exhibit that the catalytic performance is slightly affected by practical wastewater and the cyclic experiment show the stability and practicality. In conclusion, innovatively employing Fe/Fe 2 O 3 for pollutant degradation via photocatalytic technology, this research paves a promising and efficacious pathway for the application of Fe/Fe 2 O 3 .
研究领域:
环境科学
·
材料科学
✓ 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）