CHINESE PHYSICS LETTERS
·
2021
·Vol. 38
·期 6
·068201
·
IF 1.483
Jiachao Yang,Jian Zou,Chun Luo,Qiwen Ran,Xin Wang,Pengyu Chen,Chuan Hu,Xiaobin Niu,Haining Ji,Liping Wang
FeSO4 has the characteristics of low cost and theoretical high energy density (799 W⋅h⋅kg−1 with a two-electron reaction), which can meet the demand for next-generation lithium-ion batteries. Herein, FeSO4 as a novel high-performance conversion-reaction type cathode is investigated. We use dopamine as a carbon coating source to increase its electronic conductivity. FeSO4@C demonstrates a high reversible specific capacity (512 mA⋅h⋅g−1) and a superior cycling performance (482 mA⋅h⋅g−1 after 250 cycles). In addition, we further study its reaction mechanism. The FeSO4 is converted to Fe and Li2SO4 during lithium ion insertion and the Fe|Li2SO4 grain boundaries further store additional lithium ions. Our findings are valuable in exploring other new conversion-type lithium ion battery cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Jia-tao Xiang,Jun-ting Li,Xiong Zhang,Han Zhang,Shao-hui Ren,Shi-hong Zhang
This study focused on the development of a novel process of H2O2/FeSO4 preoxidation combined with wet flue gas desulfurization (WFGD) postabsorption for simultaneous desulfurization and denitrification, and recovery of sulfur and nitrogen from flue gas. The results show that when no oxidant is added, the denitrification efficiency by WFGD is only 5.3%, while under the H2O2/FeSO4 preoxidation, the desulfurization and denitrification efficiency can reach 99.9% and 83.6%, respectively. When the liquid/gas ratio reaches 18 L·m–3, the desulfurization efficiency is nearly 100%, and the denitrification efficiency can reach 90.6% due to the increased liquid/gas contact area and improved heat and mass transfer. The absorption process of SO2 and NOx involves both physical and chemical absorption, which is dominated by physical absorption, and the absorption characteristics are multilayer absorption. The desulfurization products CaSO3 and CaSO4, and the denitrification products Ca(NO2)2 and Ca(NO3)2, are absorbed by the CaCO3 slurry. The Aspen Plus process simulation results show that the desulfurization and denitrification efficiencies are 99.5% and 89.6%, respectively, and the concentrations of SO2 and NOx in the flue gas are 21.4 mg·m–3 and 41.5 mg·m–3, respectively, which meet the ultralow emission standards. In addition, the H2O2/NO molar ratio, oxidation temperature, and SO2 concentration have an important effect on the NO conversion, which then affects the denitrification efficiency.
研究领域:
环境工程
·
化学工程
·
过程模拟
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Juze Xie,Yangting Ou,Jiawen Yao,Tianxin Luan,Taosheng Zhang,Zhehan Li,Chufeng Sun,Jisheng Pan
The chemical mechanical polishing (CMP) of single-crystal silicon carbide (SiC) faces challenges such as low efficiency and limited service life of the polishing liquid. To address these issues, we encapsulated the Fenton reaction catalyst FeSO 4 within melaminated formaldehyde (MF) resin via in-situ polymerization to form microcapsules. During processing, when these microcapsules come into contact with the workpiece surface, they release Fe 2+ ions that participate in the reaction, generating highly oxidizing species that promote efficient interfacial chemical reactions. Compared with other catalysts like Fe 3 O 4 and Fe-C composites, FeSO 4 exists in the polishing slurry as Fe 2+ , which significantly enhances the efficiency of the Fenton reaction. This study systematically investigates the effects of various process parameters (water-oil ratio, stirring rate, core-wall ratio) on the morphology and particle size distribution of FeSO 4 microcapsules. The results demonstrate that under conditions of a water-oil ratio of 1:25, a stirring rate of 450 rpm, and a core-wall ratio of 1:2, the prepared microcapsules exhibit smooth surfaces, uniform particle sizes, and excellent dispersion properties. When the core-wall ratio decreases from 1:1 to 1:3, the permeation resistance of the microcapsules increases by approximately 1.5 times. Fourier Transform Infrared spectroscopy (FT-IR) confirms the encapsulation of FeSO 4 within MF resin. Thermogravimetric analysis (TGA) reveals the good thermal stability of the microcapsules. Friction and wear test results indicate that the wear area under FeSO 4 microcapsule conditions is 12.491 μm², representing a 30 % increase in material removal rate compared to traditional Fenton reaction catalysts.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
表面工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 7
·1490
·
IF 4.2
Qiang Song,Xiong Tong,Pulin Dai,Xian Xie,Ruiqi Xie,Peiqiang Fan,Yuanlin Ma,Hang Chen
In industrial manufacturing, pyrrhotite(Fe1−xS), once depressed, is commonly activated for flotation. However, the replacement of CuSO4is necessary due to the need for exact control over the dosage during the activation of pyrrhotite, which can pose challenges in industrial settings. This research introduces the use of FeSO4for the first time to efficiently activate pyrrhotite. The impact of two different activators on pyrrhotite was examined through microflotation experiments and density functional theory (DFT) calculations. Microflotation experiments confirmed that as the CuSO4dosage increased from 0 to 8 × 10−4mol/L, the recovery of pyrrhotite initially increased slightly from 71.27% to 87.65% but then sharply decreased to 16.47%. Conversely, when the FeSO4dosage was increased from 0 to 8 × 10−4mol/L, pyrrhotite’s recovery rose from 71.27% to 82.37%. These results indicate a higher sensitivity of CuSO4to dosage variations, suggesting that minor alterations in dosage can significantly impact its efficacy under certain experimental conditions. In contrast, FeSO4might demonstrate reduced sensitivity to changes in dosage, leading to more consistent performance. Fe ions can chemically adsorb onto the surface of pyrrhotite (001), creating a stable chemical bond, thereby markedly activating pyrrhotite. The addition of butyl xanthate (BX), coupled with the action of Fe2+on activated pyrrhotite, results in the formation of four Fe-S bonds on Fe2+. The proximity of their atomic distances contributes to the development of a stable double-chelate structure. The S 3p orbital on BX hybridizes with the Fe 3d orbital on pyrrhotite, but the hybrid effect of Fe2+activation is stronger than that of nonactivation. In addition, the Fe-S bond formed by the addition of activated Fe2+has a higher Mulliken population, more charge overlap, and stronger covalent bonds. Therefore, Fe2+is an excellent, efficient, and stable pyrrhotite activator.
研究领域:
矿物加工工程
·
理论化学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Juze Xie,Zhehan Li,Yinlu Xiong,Huan Ling,HaoZhe Fu,Yangting Ou,Tianxin Luan,Man Hoi Wong,Jisheng Pan
Single crystal silicon carbide (SiC) ranks among the representative third-generation semiconductor materials. Owing to its superior physical and chemical characteristics, it is regarded as a highly desirable substrate candidate for the preparation of high-power electronic chips. However, the exceptional hardness and outstanding chemical inertness of this material present substantial technical obstacles to the high-efficiency chemical mechanical polishing (CMP) of single crystal SiC substrates. In this work, the Fenton component (FeSO 4 ) in the CMP polishing slurry was encapsulated to form microcapsules. During the polishing process, these microcapsules make contact with the surface of the workpiece and liberate hydroxyl radicals (•OH) characterized by strong oxidizing properties, thereby facilitating efficient interfacial chemical reactions, effectively improving CMP processing efficiency, and extending the useful life of the polishing slurry. First, the influence of different polishing systems on the polishing effect was investigated. Subsequently, how abrasive category, particle size, abrasive concentration, contact pressure, rotational speed, and processing time affect the polishing of single crystal SiC were systematically analyzed. According to the experimental results, under the optimum process conditions—W0.5 CeO 2 abrasive, 1 wt% abrasive concentration, 228.7 kPa contact pressure, 60 rpm rotational speed, and 80 min processing time—high-efficiency and high-quality polishing of single crystal SiC can be achieved. The material removal rate (MRR) is 2.391 μm/h, and the surface roughness (Sa) is 0.617 nm.
✓ 已验证
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Yuan Hu,Yuqing Huang,Rongdong Deng,Lin Ma,Wanzhong Yin
In this study, FeSO4·7H2O was used as an auxiliary depressant to improve the selective depression effect on fluorite. Microflotation tests using oleic acid as the collector showed that the pre-addition of FeSO4·7H2O and subsequent addition of sodium silicate (SS) resulted in a stronger selective depression effect on fluorite compared with SS alone. Addition of FeSO4·7H2O reduced the required dosage of SS and had little negative effects on scheelite recovery. The selective depression mechanism of FeSO4·7H2O was investigated in detail. X-ray photoelectron spectroscopy indicated that the difference in the number of surface active sites was the mechanism for improved differential flotation of scheelite from fluorite. The improved depression of fluorite was attributed to both ferrous and sulphate ions. The pre-adsorption of ferrous species increased the number of active sites, enhancing the adsorption of silicate species on the fluorite surface. Simultaneously, sulfate ions were selectively adsorbed on the fluorite surface to form hydrophilic calcium sulfate, reducing the floatability of fluorite.
研究领域:
矿物加工
·
浮选化学
·
表面化学
·
稀有金属提取
✓ 已验证
DOI
高影响因子
MOLECULES
·
2026
·Vol. 31
·期 12
·2137
·
IF 5.1
Zhiyong Zhang,Jingjing Xiao,Sheng Liu,Pan Xiao,Huijun Cao
Sphalerite–pyrite separation has always been one of the key issues of concern in the field of mineral flotation. To achieve selective flotation separation of sphalerite and pyrite, a novel flotation system, FeSO4+NaH2PO4-CuSO4-SIBX, was adopted. This study validated the novel separation system using mineral flotation experiments. The changes in the hydrophobicity and surface charge of the minerals were evaluated using experiments such as contact angle, zeta potential, and agglomeration. Finally, the mechanism of sphalerite–pyrite separation was revealed through XPS and solution chemistry analysis. The results showed that sphalerite and pyrite were effectively separated by flotation. In the novel flotation system, the synergistic effect of FeSO4and NaH2PO4shifted the surface potential of pyrite positively, and subsequent treatment with CuSO4and SIBX did not significantly alter its hydrophobicity. However, sphalerite, after treatment with FeSO4+NaH2PO4-CuSO4-SIBX, exhibited significantly enhanced hydrophobicity and marked mineral particle agglomeration. Further research revealed that within the pH range of 6.0–8.0, hydrophilic components formed by Fe2+and H2PO4−(e.g., Fe(H2PO4)+and Fe3(PO4)2·8H2O) selectively adsorbed onto the pyrite surface, enhancing its hydrophilicity. Meanwhile, sphalerite was activated by the substitution reaction of Cu2+with ZnS, forming a hydrophobic layer on its surface with SIBX in the slurry.
✓ 已验证
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Miao Jiang,Kun Wang,Ruiyuan Xue,Qingliang Zhao,Long Wang,Weiye Wang,Jing Ding
Antimony (Sb) finds its wide application in industries, however, the research on Sb solidification/stabilization (S/S) in the Sb-contaminated soil is currently insufficient, particularly in seasonal freezing regions. Here six composite materials of Fe/Fe 2+ -fly ash-concrete additive (Fe-FA-CA) were employed and optimized to remediate the Sb-contaminated soil subject to 40 freezing-thawing (F-T) cycles. After remediation, FeSO 4 -fly ash-calcium lignosulfonate (FFC) exhibited the best resistance performance to F-T. The stabilization efficiency was evaluated with TCLP at 92.92%. Meanwhile, Sb concentration met the criteria of landfill for inert waste assessed with the compliance test for leaching (CT) of European Standard . The S/S efficiency of Sb dropped slightly from 92.68% to 88.22% (TCLP) and from 97.18% to 93.37% (CT), respectively, after aging 40 F-T cycles. The fraction of residual Sb in the soil treated by FFC was increased by 10.41%, and the strength of the S/S soil was much higher than 350 kPa, the requirement of landfills in the U.S. during F-T cycles. Additionally, the poorly crystalline Fe in the soil remediated by FFC was increased by 4.54 g/kg, suppressing Sb migration. The feasibility and effectiveness of FFC in S/S of Sb demonstrated its potential to remediate Sb-contaminated soil in seasonal freezing regions.
研究领域:
环境科学
·
土壤学
·
材料科学
·
废物管理
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Wei Yang,Qi Liu,Qiang Yang,Xinyu Zhang,Zhuolin Yang,Daobin Mu,Li Li,Renjie Chen,Feng Wu
Sodium-ion batteries are increasingly recognized as ideal for large-scale energy storage applications. Alluaudite Na 2+2 δ Fe 2− δ (SO 4 ) 3 has become one of the focused cathode materials in this field. However, previous studies employing aqueous-solution synthesis often overlooked the formation mechanism of the impurity phase. In this study, the nonequilibrium evolution mechanism between Na 2+2 δ Fe 2− δ (SO 4 ) 3 and impurities by adjusting ratios of the Na 2 SO 4 /FeSO 4 ·7H 2 O in the binary system is investigated. Then an optimal ratio of 0.765 with reduced impurity content is confirmed. Compared to the poor electrochemical performance of the Na 2.6 Fe 1.7 (SO 4 ) 3 (0.765) cathode, the optimized Na 2.6 Fe 1.7 (SO 4 ) 3 @CNTs (0.765@CNTs) cathode, with improved electronic and ionic conductivity, demonstrates an impressive discharge specific capacity of 93.8 mAh g −1 at 0.1 C and a high-rate capacity of 67.84 mAh g −1 at 20 C, maintaining capacity retention of 71.1% after 3000 cycles at 10 C. The Na 2.6 Fe 1.7 (SO 4 ) 3 @CNTs//HC full cell reaches an unprecedented working potential of 3.71 V at 0.1 C, and a remarkable mass-energy density exceeding 320 Wh kg −1 . This work not only provides comprehensive guidance for synthesizing high-voltage Na 2+2 δ Fe 2− δ (SO 4 ) 3 cathode materials with controllable impurity content but also lays the groundwork of sodium-ion batteries for large-scale energy storage applications.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）