JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Hongyu Qi,Jiaxin Han,Lin Xing,Jia Xu,Yushan Liu,Xun Wang,Tao Zhang,Yong Ma,Lingzong Meng
The phase equilibrium of the quinary system LiCl–Li2SO4–LiBO2–Li2B4O7–H2O at 323.15 K was studied with an isothermal dissolution method. The dry-salt phase diagram of the quinary system consists of one invariant point saturated with LiCl·H2O, Li2B4O7·3H2O, and LiBO2·2H2O, three univariant curves, and three crystallization regions saturated with Li2SO4·H2O corresponding to LiCl·H2O, Li2B4O7·3H2O, and LiBO2·2H2O. The J(H2O), J(Li2SO4), refractive index, and pH value change gradually with the changing concentration. Combining the equilibrium constants for boron-containing species, the pH values, and concentration of total boron, the boron-containing species distributions in the mixed solution in the system were calculated. The concentrations of B3O3(OH)52– and B5O6(OH)4– are very low and can be neglected. The boron-containing species distributions are mainly affected by m(LiCl) in the solution but less by m(Li2SO4). The results of the phase diagram and boron-containing species distribution in the quinary system can provide fundamental thermodynamic data for the extraction of lithium borate from brines.
研究领域:
物理化学
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化学热力学
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无机化学
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溶液化学
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材料科学
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产品关联
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2026
·Vol. 49
·期 1
·34
·
IF 2.1
Zhang Mengmeng,Ren Honghe,Yu Hongchao,He Zhaojun
Fe-doped polypyrrole hollow microspheres were prepared by in situ chemical oxidative polymerization. By ultrasonically dispersing the pyrrole monomer on the surface of a hollow ferroferric oxide hard template, the pyrrole monomer was uniformly distributed on the template surface and within the cavity, enabling simultaneous polymerization of pyrrole and Fe doping. The resulting Fe-doped polypyrrole hollow microspheres exhibited a regular spherical morphology with sizes in the micron range and a specific surface area of 116.7 m 2 /g. The adsorption characteristics of acid chrome blue K (AK) onto the iron-doped polypyrrole were systematically investigated, including the effects of pH, contact time, temperature, and initial dye concentration. The adsorption kinetics showed that equilibrium was reached within 50 min, and the experimental data were well described by the pseudo-second-order kinetic model. Thermodynamic analysis indicated that the adsorption of AK onto Fe-doped polypyrrole hollow microspheres is a spontaneous process. The Fe-doped polypyrrole exhibits advantages such as simple preparation, fast adsorption rate, and recyclability as an adsorbent. It offers an efficient, economical, and environmentally friendly approach, demonstrating strong potential for the treatment of high-concentration printing and dyeing wastewater.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2026
·
IF 5.1
Jian Luo,Chenkai Jin,Juan Cai,Yan Lei,Juncheng Huang,Chao Fang,Lixin Song,Haining Na,Jin Zhu
Carbon nitride materials are promising for photocatalysis and optoelectronics owing to their earth-abundant composition and tunable electronic structure, yet they often suffer from limited charge separation and poor photothermal stability. However, achieving high-temperature luminescence retention together with long-term UV durability, especially in polymer-processable forms, remains challenging. Here, we introduce a dual-alkali co-doping concept (K/Na) that enables a carbon nitride phosphor with simultaneously improved thermal endurance and UV durability, and we further demonstrate its processability into transparent polymer composites. We report a potassium/sodium co-doped carbon nitride (CN–K/Na) synthesized by a solid-state route using 3-AT, NaOH, and KOH. Structural analyses indicate that K/Na incorporation modulates the local structure of the CN framework, which is consistent with synergistic regulation of defects and charge transport. The co-doped material shows a narrowed optical bandgap (2.23 eV), enhanced photoluminescence, and an increased TRPL lifetime (τ_avg ≈ 1.42 ns, from multi-exponential fitting), and significant thermal stability, retaining 90.8% emission at 475 K and ~75% at 625 K. Under extended UV exposure, the emission exhibits a non-monotonic evolution, reaching 1.7× of the initial intensity and maintaining 43% after 192 h, indicating notable optical durability. When incorporated into a polymer matrix, CN–K/Na effectively suppresses UV-induced degradation of PMMA, maintaining stable emission with minimal spectral drift. The improved UV durability of the composites is consistent with UV attenuation by the filler and reduced photodegradation of the polymer matrix. These results establish K/Na co-doping as a practical and scalable route to robust carbon nitride luminescent materials and UV-durable transparent composites for optoelectronic applications.
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Haoyu Xu,Yuzhou Sun,Zhou Shen,Qing Zhou,Qingyun Zhu,Haifeng Gao,Chao Gao,Xiaoyun Teng,Yu Wei
In this paper, we prepared Na–K co-doped Cu 2 ZnSn(S,Se) 4 (CZTSSe) films by solution method. By optimizing the distribution of the K-doping (uniform or localized K-doping) in the precursor films, the efficiencies of CZTSSe solar cells were improved. The effect of the K-doping distribution on the properties of CZTSSe films and solar cells were investigated. Compared to the solar cells without K-doping, the uniform K-doping in the precursor film increased the solar cell efficiency from 10.4% to 11.7%. In comparison, the localized K-doping in the bottom and in the top of the precursor films yielded solar cells with efficiencies of 12.4% and 10.1%, respectively. It was determined that the K-doping distribution primarily had an influence on carrier recombination in the depletion regions of CZTSSe solar cells. Whereas k-doping at the top of the precursor film greatly enhances the carrier recombination in the depletion region, the bottom doping has the opposite effect. The reason could be that the variation of the K-doping distribution modified the crystallization of the CZTSSe films. As the result, the defect properties of the CZTSSe films were altered. Moreover, the effect of the bottom K-doping on the back contact properties of CZTSSe solar cells was investigated by impedance spectroscopy . Though the K-doping can reduce the back contact barrier of the solar cell, the back contact barrier still achieved the height of 228 meV. The results indicated that the back contact barrier would be an important limiting factor for the efficiency of CZTSSe solar cell.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 13
·4825-4834
·
IF 5.7
Huijie Wu,Sisi Liang,Weixiong You,Le Liu,Yongwei Guo,Shujian Wang,Liping Song,Zihao Wang,Haomiao Zhu
Near-infrared (NIR) phosphors with emission peak wavelength longer than 800 nm have attracted significant attention due to their wide applications. However, a key challenge lies in developing high photoluminescence (PL) thermal stability phosphors. Herein, we synthesized a NIR phosphor Na3Al2(PO4)2F3:Cr3+ (NAPOF:Cr3+) through the solid-state reaction method. The NAPOF:Cr3+ phosphor exhibits an intense broadband emission peak at 810 nm and covers a wide spectral range from 650 to 1100 nm. Notably, this phosphor demonstrates zero PL thermal quenching even at 398 K. This outstanding thermal stability can be primarily ascribed to the inherent structural rigidity and wide bandgap of the NAPOF crystal together with the medium electron–photon coupling effect. The fabricated broadband NIR light-emitting diodes (LEDs) using the NAPOF:Cr3+ phosphor exhibits a highest NIR light output power of 28.1 mW under a drive current of 150 mA, and a corresponding electro-optical conversion efficiency of 8.6%. Our findings highlight the tremendous potential of the NAPOF:Cr3+ phosphor for broad-spectrum NIR-LED applications.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 8
·1932
·
IF 5.076
Leqiang Wu,Hengjia Shao,Chen Yang,Xiangmin Feng,Linxuan Han,Yanli Zhou,Wei Du,Xueqin Sun,Zhijun Xu,Xiaoyu Zhang,Fuyi Jiang,Caifu Dong
To date, the fabrication of advanced anode materials that can accommodate both Na+and K+storage is still very challenging. Herein, we developed a facile solvothermal and subsequent annealing process to synthesize SnS2/RGO composite, in which SnS2nanosheets are bonded on RGO, and investigated their potential as anodes for Na+and K+storage. When used as an anode in SIBs, the as-prepared SnS2/RGO displays preeminent performance (581 mAh g−1at 0.5 A g−1after 80 cycles), which is a significant improvement compared with pure SnS2. More encouragingly, SnS2/RGO also exhibits good cycling stability (130 mAh g−1at 0.3 A g−1after 300 cycles) and excellent rate capability (520.8 mAh g−1at 0.05 A g−1and 281.4 mAh g−1at 0.5 A g−1) when used as anode for PIBs. The well-engineered structure not only guarantees the fast electrode reaction kinetics, but also ensures superior pseudocapacitance contribution during repeated cycles, which has been proved by kinetic analysis.
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2013
·
IF 3.365
Jiangfeng Yang,Rajamani Krishna,Junmin Li,Jinping Li
Separation of CO 2 from CH 4 is needed in order to use low-quality biogas or landfill gas and to reduce greenhouse gas emissions. To study the separation of a CO 2 /CH 4 gas mixture , K-KFI (Si/Al = 4.59) sorbent was synthesized and pelletized. We performed breakthrough experiments at flow rates of 16.6 and 30 N mL/min under ambient temperature and pressure (298 K, 100 kPa). The breakthrough experiments results showed that K-KFI separated a 40%/60% mixture of CO 2 /CH 4 better than a 50%/50% mixture. Furthermore, the separation performance of K-KFI is superior to that of commercial sorbents zeolite-5A and 13X under the same conditions. Simulations of the breakthrough of binary mixed gases CO 2 /CH 4 = 40%/60%, yield results that are in good agreement with our experimental data. By performing breakthrough simulations at a total pressure of 2 MPa, we demonstrated that pure CH 4 can be separated from CO 2 /CH 4 gas mixtures under high pressure, and that pure CH 4 can be recovered in the initial stages of the breakthrough.
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·Vol. 40
·期 11
·1691-1698
·
IF 3.712
Qingsong Hu,Zaifa Pan,Guijie Liang
White light-emitting diodes (WLEDs) fabricated by single-phase full color emitting phosphor are an emerging solution for health lighting. The crystallographic site occupation of activators in a proper host lattice is crucial for sophisticated design of such phosphor. Here, we report a high quality white light-emitting phosphor Ba 2 Ca(BO 3 ) 2 :Ce 3+ (K + ),Eu 2+ ,Mn 2+ with spectral distribution covering whole visible region. Blue light emission originates from Ce 3+ ions occupying preferentially Ba 2+ site by controlling synthesis conditions. Green and red lights are obtained from Eu 2+ occupying Ba 2+ (and Ca 2+ ) site and Mn 2+ occupying Ca 2+ site, respectively. In this triple-doped phosphor, strong red emission with a low concentration of Mn 2+ is realized by the efficient energy transfer from Ce 3+ and Eu 2+ to Mn 2+ . Furthermore, high quality white light is accomplished by properly tuning the relative doping amount of Ce 3+ (K + )/Eu 2+ /Mn 2+ based on efficient simultaneous energy transfer. The results indicate that Ba 2 Ca(BO 3 ) 2 :Ce 3+ (K + ),Eu 2+ ,Mn 2+ is a promising white light-emitting phosphor in WLEDs application.
研究领域:
材料科学
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无机化学
·
发光材料
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固态照明
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能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Haijun Han,Xiang Ji,Junjie Ma,Zhifeng Xu,Lijiang Guo,Dongdong Li,Yan Yao
Water activities for the CaCl2–SrCl2–H2O ternary system and its sub-binary system were elaborately determined using an isopiestic vapor-pressure method at 323.15 K. The solubility of the titled ternary system at 323.15 K was also determined by the isothermal equilibrium method. The Pitzer–Simonson–Clegg (PSC) model was used for correlating the determined water activity and solubility data, simulating the thermodynamic properties, and predicting the solubility isotherm of the titled system. The reliability of the determined solubility results in this work was evaluated by comparing with the solubility isotherms calculated with the PSC model. The model simulation results showed that the thermodynamic properties and solubility can be predicted with binary parameters only. The experiment and simulation results showed that the equilibrium solid phase in the CaCl2–SrCl2–H2O ternary system are pure salts, and no solid solution was found at 323.15 K.
研究领域:
化学热力学
·
无机化学
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溶液化学
·
相平衡
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Guojun Zhou,Xingxing Jiang,Jing Zhao,Maxim Molokeev,Zheshuai Lin,Quanlin Liu,Zhiguo Xia
Topological chemical reaction methods are indispensable for fabricating new materials or optimizing their functional properties, which is particularly important for two-dimensional (2D)-layered compounds with versatile structures. Herein, we demonstrate a low-temperature (∼350 °C) ion exchange approach to prefabricate metastable phosphors ALa1–xTa2O7:xBi3+ (A = K and Na) with RbLa1–xTa2O7:xBi3+ serving as precursors. The as-prepared ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) share the same Dion–Jacobson type 2D-layered perovskite phase, and photoluminescence analyses show that ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) phosphors exhibit broad emission bands peaking at 540, 550, and 510 nm, respectively, which are attributed to the nonradiative transition of Bi3+ from excited state 3P1 or 3P0 to ground state 1S0. The various Bi3+ local environments at the crystallographic sites enable the different distributions of emission and excitation spectra, and the photoluminescence tuning of ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) phosphors are realized through alkali metal ion exchange. Notably, the combination of superior trivalent bismuth emission and low-temperature ion exchange synthesis leads to a novel yellow-emitting K(La0.98Bi0.02)Ta2O7 phosphor which is successfully applied in a white LED device based on a commercially available 365 nm LED chip. Our realizable cases of this low-temperature ion exchange strategy could promote exploration into metastable phosphors with intriguing properties.
研究领域:
材料科学
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光电子学
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无机化学
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发光材料
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固态化学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 48
·17486-17492
·
IF 4.099
Fangfang He,Lei Wang,Cuifang Hu,Jing Zhou,Qian Li,Ling Huang,Daojiang Gao,Jian Bi,Xin Wang,Guohong Zou
Four antimony fluoride sulfates named A2SO4·SbF3 (A = Na+, NH4+, K+, Rb+) have been successfully synthesized using a hydrothermal method by introducing Sb3+ cations with a stereochemically active lone pair in sulfates and subsequently tuning the structure through the second monovalent cations. All of the title compounds are stoichiometrically equivalent materials which share a common structural motif composed of a distorted SO4 tetrahedron and an asymmetric SbF3 polyhedron. However, the macroscopic centricities of these four compounds are significantly influenced by the size and coordination environment of cations; Na2SO4·SbF3 crystallizes in centrosymmetric space groups Cmca and (NH4)2SO4·SbF3 in Pbca, while K2SO4·SbF3 and Rb2SO4·SbF3 crystallizes in noncentrosymmetric space group P212121. Complete characterization including thermal analyses, infrared and UV-vis spectroscopy, and theoretical calculations is also reported. Powder second harmonic generation measurement for noncentrosymmetric K2SO4·SbF3 and Rb2SO4·SbF3 indicated that both of them are type I phase-matchable.
研究领域:
无机化学
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材料科学
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非线性光学
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晶体工程
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固态化学
✓ 已验证
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2022
·Vol. 3
·期 7
·2200006
·
IF 0
Shasha Hao,Shaotang Yu,Xinge Liu,Bingyan Li,Shuaiqi Han,Hao Xin,Weibo Yan,Wei Huang
Copper indium gallium selenide Cu(In,Ga)Se 2 (CIGS) solar cells fabricated by vacuum thermal evaporation, magnetron sputtering, or organic solvent solution-process either lead to high manufacturing cost and film nonuniformity or cause explosion, toxication and pollution. To address these issues, herein, water as a solvent to prepare the CIGS precursor solution is used and 7.04% efficient CIGS solar cells without MgF 2 antireflection layer is obtained. Furthermore, for the first time, K doping on CIGS films via adding “K + ” into the aqueous precursor solution is conducted. K–In–Se species is formed in the process of selenization and acts as a Se reservoir during CIGS grain growth, resulting in improved quality of the CIGS film with much larger grains. K doping can also inhibit the loss of Ga element. The high-bandgap K–In–Se phase and higher Ga content combine to result in the increase in the CIGS bandgap. As a result, the K-doped CIGS solar cell achieves a 33.1% enhancement in efficiency to 9.37%, with the significant increase in the open-circuit voltage from 520.5 to 597.1 mV and fill factor from 50.77 to 55.36%. These results provide an important preliminary foundation for the development of aqueous precursor solution-based CIGS solar cells.
研究领域:
光伏技术
·
材料科学
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薄膜太阳能电池
·
半导体材料
✓ 已验证
DOI
危险品化学品经营许可证（带存储）