Journal of Sustainable Metallurgy
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2025
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IF 3.2
Mi Jiayu,Wang Zhenqiang,Qiu Yuqing,Chen Xingyu,Chen Ailiang,Liu Xuheng,Li Jiangtao,He Lihua,Sun Fenglong,Zhao Zhongwei
The leaching agents for molybdenum calcine are mainly acid and alkali solutions represented by ammonia water, which have poor selectivity for molybdenum and are not environmentally friendly. Therefore, a novel leaching agent which can avoid the aforementioned problems needs to be sought. Given that molybdenum in molybdenum calcine mainly exists in the form of molybdenum trioxide, this research investigated the dissolution behavior of molybdenum trioxide in sodium molybdate solution under different process conditions was studied, and the leaching of molybdenum calcine in sodium molybdate solution was preliminarily tested. The Raman characterization results of the dissolution system indicated that molybdenum trioxide and sodium molybdate with low polymerized states can form high polymerized molybdate through self-coordination reaction. The optimal dissolution conditions were 85 °C, pH 8.00, initial molybdenum concentration 26.78 g/L. Under the optimal conditions, the dissolution capacity of molybdenum trioxide in sodium molybdate can reach 2.460 g/g. The preliminary leaching test indicated that the sodium molybdate system had a high selectivity for molybdenum in molybdenum calcine, and the leaching ratio of molybdenum was 96.4%. This study confirmed the feasibility of sodium molybdate as a leaching agent for molybdenum calcine and laid a theoretical foundation for the leaching process of molybdenum calcine. Graphical
研究领域:
化学工程
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环境科学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2022
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IF 5.436
Xiaoxia Feng,Pengxiao Xu,Jinli Liu,Xiyue Zhao,Jing Cao,Jiacheng Liu
Zero-dimensional Cs4PbBr6 nanocrystals (NCs) possess attractive photoluminescence (PL) properties and feature facile chemical synthesis, making them promising for application in luminescent materials. However, Cs4PbBr6 remains sensitive to polar solvents and thermal stimuli because of soft ionic nature of Cs4PbBr6 and dynamic behavior of surface ligands. Herein, a strategy controlled by an in situ surface coordination reaction is developed to fabricate stable NCs with a Cs4PbBr6-Zn(moi)2 core–shell structure. It was found that the Cs4PbBr6 surface regulated by the use of 2-mercaptoimidazole (called moi) and the coordination between the −NH group of moi and Zn2+ is critical for the formation of Cs4PbBr6-Zn(moi)2 core–shell NCs. Meanwhile, the thickness of the Zn(moi)2 shell can be facilely controlled by the growth time because of the solubility of moi and Zn(OAc)2·2H2O in ethyl acetate. Compared to bare Cs4PbBr6, Cs4PbBr6-Zn(moi)2 NCs exhibited highly improved polar solvent resistance and thermal stability. By combining the sensitivity of Cs4PbBr6 and the stability of Cs4PbBr6-Zn(moi)2, we used two NCs as PL security inks to fabricate optical anticounterfeiting labels. Thus, the disposable or reusable optical anticounterfeiting label is achieved by changing the external dual-stimuli. This work provides a novel strategy to enhance the stability of Cs4PbBr6 and develop its potential interest for application in anticounterfeiting technologies.
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Bo Zhang,Zhen Li,Liwei Wang
Phase change materials (PCMs) show great promise for thermal energy storage and management owing to their high storage capability and stable working temperature. Developing form-stable phase change composites (PCCs) is an effective approach to addressing the liquid leakage problem. However, conventional fabrication methods of incorporating PCMs into three-dimensional crosslinking networks generally involve freeze-drying and vacuum impregnation, which leads to high energy consumption and complicated procedure. Here, we design a novel strategy to rapidly synthesize form-stable PCCs supported by a cellulose nanofiber (CNF)-based skeleton, which combines a series of reactions and methods including click chemistry, coordination reactions, and solvent exchange. The synthesis mechanisms are revealed by adequate characterizations. Based on the facile fabrication strategy, excellent comprehensive performance such as desirable phase change enthalpy, high enthalpy efficiency, superb mechanical and thermal stability, outstanding cycle stability, and mitigated supercooling is realized. Besides, we discover that introducing expanded graphite into the CNF-based matrix could extend the applicability of the strategy from hydrophilic PCMs to hydrophobic PCMs due to repulsion mitigation between the matrix and PCMs, and considerably enhance the thermal conductivity of the PCCs simultaneously. This work achieves a breakthrough in rapidly and effectively fabricating high-performance form-stable PCCs.
研究领域:
材料科学
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热能工程
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化学工程
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2024
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IF 3.9
Chenglong Ji,Yuncai Gao,Yulu Wang,Ran Li,Yu-e Shi,Zhenguang Wang,Yongqing Zhai
Graphical The dim and short-lived RTP emissive organic molecules were transferred into afterglow materials with an emission efficiency of 45 % and emission lifetime of 1.9 s, through a straightforward coordination and in-situ precipitation reaction. The coordination reaction reduced the energy gaps between singlet and triplet states and stabilized the excited states of the guest molecules. Developing efficiency and long-lived room-temperature phosphorescence (RTP) materials through straightforward methods is highly desired. In this work, a stepwise stabilization strategy was proposed by the coordination and in-situ precipitation reactions among organic precursors, inorganic cation and anions, producing room-temperature phosphorescence materials with high emission efficiency (phosphorescence quantum yield of 45 %). Structural and photophysical characterizations revealed the coordination reaction reduced the energy gaps between singlet and triplet states and stabilized the excited states of the guest molecules. The in-situ precipitation reaction produced a solid matrix, which provided isolated environments for protecting the excitons from quenching. The applications of RTP materials in information encryption were demonstrated. The presented results provided a new clue for producing RTP materials, and extended their applications in wide fields.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Xiaotong Wang,Tongtong Ye,Shaohui Geng,Shuna Ren,Xuming Zhao,Lihua Chen
A dual-signal strategy was developed based on a coordination reaction between iron(II) ions (Fe 2+ ) and potassium hexacyanoferrate(III) (K 3 [Fe(CN) 6 ]) to distinguish between brucella vaccine and wild strain. Utilizing metal-organic frameworks (MOFs), MOF Al (aluminum) @Fe 2+ @P 1 and MOF Fe @P 2 were synthesized and affixed to a hyaluronic acid (HA)-doped electrode. Hairpin probe 1 (P 1 ) has a common sequence (P 1 ') recognizing a fragment (T 1 ) in vaccines and wild strains. In contrast, hairpin probe 2 (P 2 ) has a differential sequence (P 2 ') only targeting a specific fragment (T 2 ) in the wild strain. Experimental findings indicated that activation of T 1 led to the dissociation of P 1 from MOF Al @Fe 2+ @P 1 , which released Fe 2+ into a buffer containing trace Fe 2+ . Following this, the addition of hydrogen peroxide (H 2 O 2 ) and K 3 [Fe(CN) 6 ] resulted in the formation of KFe[Fe(CN) 6 ] (PB). In contrast, specific activation of T 2 caused the detachment of P 2 from MOF Fe , thereby exposing its catalytic site. In H 2 O 2 , this catalytic site facilitated the conversion of trace Fe 2+ in buffer to Fe 3+ , with no PB generated after the addition of K 3 [Fe(CN) 6 ]. Simultaneous activation of T 1 and T 2 promoted the oxidation of Fe 2+ released from MOF Al by the exposed catalytic site of MOF Fe . The ratio of K 3 [Fe(CN) 6 ] to PB exhibited dynamic changes. Specifically, the ratio below 2.37 ± 0.05 indicated a Brucella-positive sample, whereas a ratio under 0.9 ± 0.02 suggested a sample derived from the vaccine. The scarcity of dual-signal sensors employing coordination reactions underscores the significance of this approach. Moreover, it addressed the challenges associated with brucella detection, demonstrating robust analytical performance.
研究领域:
生物化学
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医学检测
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分析化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Xuyou Yang,Junhui Huang,Fan Yang,Wenguang Wang,Caihong Xue,Wanji Zhou,Yadong Wu,Lu Shao,Yanqiu Zhang
Phytate as a natural strongly charged organophosphate has recently attracted much attention in diverse fields including membrane separations towards water-energy-food nexus. However, the ideal phytate-based nanofiltration membrane with defect-free and ultrathin selective layer for highly-efficient water treatment is still much challengeable due to the typical aggregation of metal ions and uncontrolled reaction between metal ion and organophosphate via conventional coating method. Herein, metal-organophosphate biphasic interfacial coordination reaction is proposed to construct ultrathin (13.4 nm) selective layer of phytate-based nanofiltration membranes with high permeance and excellent stability by controllable coordination assembly. Iron acetylacetonate (Fe(acac) 3 ) as an organic phase monomer with powerful electron-gaining ability is exploited to avoid the aggregation of traditional Fe(III) in aqueous phase, which can also coordinate with phytic acid (PA) to ensure a defect-free ultra-thin selective layer. The architecture of the phytate-based selective layer can be well regulated by optimizing the coordination metal source, the concentration of PA and Fe(acac) 3 , reaction time, so as to achieve the ultrahigh permeation flux of 190 L m −2 h −1 with excellent dye rejection (99.6%). Most interestingly, our phytate-based nanofiltration membranes with plenty of hydrophilic phosphate groups on the surface and high binding energy of P–O–Fe bond (−315.1 kJ mol −1 ) exhibited the long-term separation stability, excellent acid-resistance and anti-pollution ability, realizing the stable membrane separation process under harsh conditions.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2016
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IF 0.963
Jun Wang,Huan-Yu Li,Lei Song,Wei-Guang Shi,Na Zhang,Cui-Qin Li
Two novel dendritic poly(amido-amine) (PAMAM) bridged salicylaldimine ligands were synthesized by Schiff base reaction using 1.0 generation dendritic PAMAM as bridged groups. The cobalt complex with 1,4-butanediamine as core (C1) and the cobalt complex with 1,6-hexanediamine as core (C2) based on dendritic PAMAM bridged salicylaldimine ligands were prepared by metallic coordination reaction, respectively. The structures of the ligands and the dendritic cobalt complexes were characterized by fourier transform infrared (FTIR), ultraviolet spectra (UV), hydrogen nuclear magnetic resonance (1H NMR) and electrospray ionization mass spectra (ESI-MS). The complexes C1 and C2 were evaluated as catalyst precursors for ethylene oligomerization after being activated with methylaluminoxane (MAO), diethylaluminum chloride (Et2AlCl), ethylaluminium dichloride (EtAlCl2) and ethylaluminum sesquichloride (EASC). The dendritic cobalt complexes exhibited the highest activity and selectivity for high carbon oligomers with EASC as activator. Under the conditions of 1.0 MPa, 25°C and Al/Co molar ratio 1500, the catalytic activity and selectivity for C10–C20 using C1 were 3.44×106 g·(mol Co·h)−1 and 76.53% after activation with EASC, and the catalytic activity and selectivity for C10–C20 using C2 were 3.42×106 g·(mol Co·h)−1 and 84.50%, respectively.
研究领域:
无机化学
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有机金属化学
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高分子化学
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催化化学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）