ACTA OCEANOLOGICA SINICA
·
2014
·Vol. 33
·期 9
·100-108
·
IF 0.684
Kang Xuming,Liu Sumei,Zhang Guoling
Cold diffusion methods are used to separate and quantify the three reduced inorganic sulfur species into acid volatile sulfide (AVS), pyrite-S and element sulfur (ES) in the sediments of the Yellow and East China Seas. The results show that up to 25.02 μmol/g of AVS, 113.1 μmol/g of pyrite-S and 44.4 μmol/g of ES are observed in the sediments of the Yellow Sea and East China Sea. Pyrite-S is the predominant sulfide mineral in the sediments, while the concentration of AVS is quite low at most stations in the study area. The amounts and reactivity of organic matter are the primary limited factor for the sulfide formation, while an iron limitation and a sulfate limitation are not observed in the sediments of the Yellow Sea and East China Sea. The irregular profiles of the three reduced inorganic sulfur species also reflected the comprehensive influence of sediment composition and sedimentation rates.
研究领域:
海洋学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Gan Cheng,Yujie Peng,Peigao Duan,Enze Li,Chao Lv,Xin Wang,Fangqin Cheng
Coal remains a primary global energy source, however, the continued exploitation has positioned high-sulfur coal as a critical concern, with its desulfurization remaining a significant technical challenge worldwide. In this study, fine high-sulfur samples were selected for investigation, and a series of flotation and electrochemical methods were employed for desulfurization. The results indicate that both sulfur and ash contents of high-sulfur coal decrease with decreasing particle size. The desulfurization efficiencies for different methods are as follows: 31.04% for flotation, 32.15% for grinding-flotation, 41.08% for electrochemistry, 42.04% for ultrasonic-electrochemistry, 49.51% for electrochemical-flotation, and 51.23% for ultrasonic-electrochemistry-grinding-flotation. Flotation effectively removes most of the inorganic sulfur content, while electrolysis can remove both inorganic sulfur and a portion of organic sulfur content. Grinding facilitates the liberation of sulfur inclusions in coal, while ultrasonic treatment aids in detaching gangue minerals from the coal surface, thereby accelerating the electrochemical reactions. Simulation results show that the C-S bond in coal is more resistant to dissociation than the S-S bond. The oxidation efficacy varies across different crystal planes, with the {111} plane exhibiting the most optimal electrochemical oxidation performance. Furthermore, molecular dynamics simulations indicate that both the collector and electrolytic oxidation affect sulfur migration within the coal matrix.
研究领域:
能源工程
·
化学工程
·
矿物加工
·
电化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Maoxia Yang,Baiqing Zhao,Jianying Li,Shaomin Li,Gen Zhang,Shiqi Liu,Yanhua Cui,Hao Liu
Solid polymer electrolytes (SPEs) are flexible, low cost, and easily scalable for battery manufacturing. These merits make SPEs one of the most practical solid-state electrolytes. Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), which has good mechanical properties and good thermal stability, is considered a promising polymer for SPEs. However, PVDF-HFP is unstable due to the dehydrofluorination side reaction when PVDF-HFP-based electrolytes cycle with Li metal. This reaction leads to the deterioration of the electrolyte–electrode interface. In this work, the PVDF-HFP polymer electrolyte is modified with LiOH during the synthesis of SPEs (pre-dehydrofluorination). The modified electrolyte delivers significantly enhanced stability toward the Li metal anode. The electrochemical stable window is extended from 4.75 to 5.00 V, and the stable cycle time of the galvanostatic test of Li symmetric cells at 0.1 mA cm–2 increases from about 100 h to over 500 h. Ex situ scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses indicate that the polymer degradation is suppressed after modification, and a stable interface containing more LiF and inorganic sulfur compounds forms between the electrolyte and Li metal; the interface could effectively suppress Li dendrite growth. Combining electrochemical results with ex situ SEM and XPS analysis, it is observed that the pre-dehydrofluorination is the reason for inhibiting polymer degradation and suppressing Li dendrite growth toward the Li metal anode. These findings will promote the development of safe all-solid-state Li metal batteries.
研究领域:
材料科学
·
电化学
·
电池技术
·
固态电解质
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Jiyue Ding,Xiaoyu Liu,Ning Zhang,Yi Wang,Ke Cui,Huachi Yu,Jingyi Chen,Qingyang Xu,Jianyang Gao,Huaizhi Shao,Zilin Meng
The Mg-Al layered double hydroxides are intercalated with inorganic sulfides of sodium trithiocarbonate (Na 2 CS 3 ), sodium sulfide (Na 2 S), and organic sulfides of sodium dimethyldithiocarbamate (SDTC), trithiocyanuric acid (TMT) via the co-precipitation method for the purpose of removing Cu 2+ and Pb 2+ in aqueous solutions. The sorbents are characterized by XRD, FT-IR, BET, SEM, XPS and zeta potential. The sorption kinetic data fits well with the pseudo-second-order model and the intra-particle diffusion model. The sorption isotherm data for Cu 2+ align more closely with the Langmuir model, suggesting a preference for monolayer adsorption, whereas Pb 2+ sorption better follows the Freundlich model, indicating heterogeneous multilayer adsorption, thus revealing distinct sorption processes. Among the sulfur-intercalated LDHs, SDTC@LDH exhibits the highest sorption capacity for Cu 2+ and Pb 2+ , reaching 357.14 mg/L and 274.76 mg/L, respectively. Molecular simulations further elucidate the superior performance of organic sulfur-intercalated LDHs, demonstrating higher binding energies and stronger affinity between organic sulfides and Cu 2+ /Pb 2+ . The sorption mechanisms for Cu 2+ and Pb 2+ are explored: Cu 2+ preferentially reacts with interlayer sulfides in LDHs, subsequently displacing hydroxyl groups from the LDHs layers to form precipitates, whereas Pb 2+ first bonds with hydroxyl groups on the LDHs layers, causing structural collapse, followed by capture by exposed interlayer sulfides. Dynamic sorption experiments demonstrate that SDTC@LDH can treat larger volumes of aqueous solutions compared to other adsorbents, indicating that SDTC@LDH possesses superior sustained sorption capacity in water treatment applications. Coexisting ion experiments, pH tests, reusability studies, and sulfide/heavy metal leaching assessments confirm the high selectivity and stability of the adsorbents for Cu 2+ and Pb 2+ , with minimal risk of secondary pollution. Metal speciation analysis reveals that organic sulfur-intercalated LDHs provide more stable sorption for Cu 2+ and Pb 2+ .
研究领域:
环境科学
·
材料化学
·
水处理
·
吸附技术
·
重金属修复
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）