Processes
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2022
·Vol. 10
·期 5
·823
·
IF 3.352
Bin Li,Xinjun Jing,Junsheng Yuan
The phase equilibria of the reciprocal quaternary system LiBr-Li2SO4-KBr-K2SO4-H2O and its ternary sub-systems LiBr-Li2SO4-H2O and KBr-K2SO4-H2O at 308.15 K were studied using the isothermal dissolution equilibrium method. Then, the solubility data of the equilibrium solutions were collected, and the phase diagrams were plotted. The phase diagrams of the ternary sub-systems at 308.15 K were compared with those at other temperatures. This study found that the phase diagram of the LiBr-Li2SO4-H2O system at 308.15 K consisted of an invariant point, two solid-phase crystallization regions of Li2SO4·H2O and LiBr·2H2O, and their corresponding solubility curves. The system generated two hydrated salts, which belonged to the hydrate type I phase diagram. The phase diagram of the KBr-K2SO4-H2O system at 308.15 K consisted of an invariant point, two univariant solubility curves, and two solid-phase crystallization regions of KBr and K2SO4, and no solid solution and double salts were formed. Thus, it belonged to a simple co-saturation type phase diagram. In the LiBr-Li2SO4-KBr-K2SO4-H2O system, K2SO4·Li2SO4double salt formed at 308.15 K, and the phase diagram consisted of three invariant points, five crystallization regions, and seven univariant solubility curves.Keywords:lithium bromide;potassium bromide;lithium sulfate;potassium sulfate;phase equilibrium
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 6
·1234-1240
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IF 1.063
Cui Ruizhi,Li Wu,Dong Yaping,Li Jun
The stable phase equilibria of quaternary systems LiBr-NaBr-MgBr 2 -H 2 O and LiBr-KBr-MgBr 2 -H 2 O at 298.15 K were studied by both experimental measurement(isothermal solution saturation method) and theoretical prediction(Pitzer model). The solubilities of the saturated solution have been determined experimentally and two stable phase diagrams and relevant water diagrams of the two quaternary systems were obtained. Results show that quaternary system LiBr-NaBr-MgBr 2 -H 2 O is hydrate II type as NaBr and NaBr·2H 2 O coexistence. Its phase diagram consists of only one invariant point, four univariant curves, and five crystallization fields. The quaternary system LiBr-KBr-MgBr 2 -H 2 O is a complex type as the double salt KBr·MgBr 2 ·6H 2 O formed. In addition to this double salt, the three single salts LiBr·2H 2 O, KBr and MgBr 2 ·6H 2 O also crystallize. In this paper, the solubilities of phase equilibria in above quaternary systems were also calculated by the Pitzer’s electrolyte solution model. All the needed parameters can be obtained from the literature or be fitted by experimental data. On the Basis of the experimental and calculated results, the phase diagram of the quaternary system was plotted for comparison. It shows that the calculation results are consistent with the experimental ones.
研究领域:
化学热力学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2022
·
IF 3.119
Guo-Liang Nie,Rui-Zhi Cui,Wu Li
According to the composition characteristics of lithium, potassium, bromine, and other resources rich in the salt lake brine of the Qinghai–Tibet Plateau, the phase equilibria of the quaternary system LiBr-NaBr-KBr-H2O and its ternary subsystem LiBr-KBr-H2O at 323.15 K are studied by an isothermal dissolution equilibrium method. The solubility of each system in equilibrium solution at the corresponding temperature is measured, and the corresponding phase diagrams are drawn according to the phase equilibrium experimental data. The results show that there is no complex salt or solid solution in the ternary system LiBr-KBr-H2O at 323.15 K. The phase diagram contains one invariant point (E1), two univariate curves (AE1 and BE1), and two equilibrium solid crystallization regions (corresponding to LiBr·H2O and KBr), belonging to the simple cosaturated type. The quaternary system LiBr-NaBr-KBr-H2O also has no formation of complex salt and solid solution. The phase diagram contains two invariant points (F1 and F2), five univariate curves (E1F1, E3F1, F1F2, E2F2, and E4F2), and four equilibrium solid-phase crystallization regions (corresponding to LiBr·H2O, KBr, NaBr·2H2O, and NaBr). At the same time, to further explain the phase equilibrium relationship of each system at different temperatures and the change rule of each component, comparison and discussion are carried out.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 11
·15722-15732
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IF 4.672
Yu Bai,Wenjuan Qiu,Shuangfeng Wang
Summary At present, there are few kinds of phase change materials that suitable for medium temperature heat storage. Among them, sugar alcohols have broad application prospects in the heat storage at medium temperature due to their suitable phase transition temperature. In this work, eutectic phase change material (PCM) was prepared with D-mannitol as PCM and KBr as melting point modifier. Expanded graphite (EG) was used as thermally conductive support network to prepare shape-stable composite phase change material (CPCM). The prepared CPCM—10% EG/PCM has an appropriate phase transition temperature (136.88°C), high phase melting enthalpy (215.7 J/g), and good photothermal conversion (81.9%). The thermal conductivity of 10% EG/PCM reached 6.01 W/(m K), which is approximately 10 times higher than D-mannitol (0.603 W/(m K)). Because of its excellent thermal properties, the applications of CPCM in energy storage and photothermal conversion can be further broadened.
研究领域:
材料科学
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能源存储
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太阳能利用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2021
·
IF 6.186
Dongjing Liu,Lingtao Yang,Bin Li,Jiang Wu
Rice husk , as an abundant agricultural waste and renewable biomass, is adopted to produce porous silica which is used as a potential carbon-free adsorbent for mercury emission control of coal-fired power plants. The rice husk derived porous silica (RHS) exhibits a good Hg 0 adsorption capability with Hg 0 removal efficiency above 80% in the temperature range of 60–140 °C, which is plausibly due to the big specific surface area and mesoporous structure. The mercury removal performance of RHS can be evidently reinforced by KBr modification. The optimal KBr loading value and reaction temperature are 2 wt% and 140 °C, respectively. Acidic gas components, such as NO and SO 2 , both show slight inhibitive effects on Hg 0 adsorption process probably owing to the competitive adsorption or the elimination of adsorption sites.
研究领域:
环境科学
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大气污染控制
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材料科学
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吸附技术
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能源工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaofei Miao,Xiangxin Zhang,Sujing Chen,Yongchuan Liu,Yuanqiang Chen,Junhong Lin,Qi Chen,Yining Zhang
For improving the energy density of carbon-based supercapacitors, the highly reversible redox mediators with giant pseudocapacitance have been studied extensively. In this work, the dual-redox combination of sodium anthraquinone-2-sulfonate (AQS) and potassium bromide (KBr) is introduced into the carbon-based supercapacitors to enhance the electrochemical performances. In the dual-redox enhanced supercapacitors (DRESc), the performances of negative and positive electrodes are improved by AQS and KBr, respectively. In order to use AQS and KBr rationally and effectively, two different approaches are studied: (I) redox mediators are adsorbed in the electrodes; (II) redox mediators are added into the electrolyte. The experimental results demonstrate that the combination of adsorbing AQS onto the negative electrode (the approach I) and adding KBr in the electrolyte (the approach II) is the best approach. Furthermore, electrochemical results prove that it is an optimal choice to adsorb 3 mg AQS for the negative electrode in this work. Meanwhile, to match the AQS-enhanced negative electrode, synchronous potential measurements indicate that the optimal choice for the positive electrode is adding 1.5 M KBr in the 1 M H 2 SO 4 electrolyte. Finally, the DRESc achieved a maximum gravimetric energy density (E G ) of 32.05 Wh kg −1 at 0.5 A g −1 and a maximum gravimetric power density (P G ) of 2200 W kg −1 at 8 A g −1 , implying that the AQS-Br dual-redox system is a promising candidate for energy storage and conversion.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
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2020
·
IF 14.612
Jun-Nan Yang,Yang Song,Ji-Song Yao,Kun-Hua Wang,Jing-Jing Wang,Bai-Sheng Zhu,Ming-Ming Yao,Sami Ur Rahman,Yi-Feng Lan,Feng-Jia Fan,Hong-Bin Yao
All-inorganic lead halide perovskite nanocrystals (NCs) are potential candidates for fabricating high-performance light-emitting diodes (LEDs) owing to their precisely tunable bandgaps, high photoluminescence (PL) efficiency, and excellent color purities. However, the performance of pure red (630–640 nm) all-inorganic perovskite LEDs is still limited by the halide segregation-induced instability of the electroluminescence (EL) of mixed halide CsPbI3-xBrx NCs. Herein, we report an effective approach to improving the EL stability of pure red all-inorganic CsPbI3-xBrx NC-based LEDs via the passivation of potassium bromide on NCs. By adding potassium oleate to the reaction system, we obtained potassium bromide surface-passivated (KBr-passivated) CsPbI3-xBrx NCs with pure red PL emission and a photoluminescence quantum yield (PLQY) exceeding 90%. We determine that most potassium ions present on the surface of NCs bind with bromide ions and thus demonstrate that potassium bromide surface passivation of NCs can both improve the PL stability and inhibit the halide segregation of NCs. Using KBr-passivated CsPbI3-xBrx NCs as an emitting layer, we fabricated stable and pure red perovskite LEDs with emission at 637 nm, showing a maximum brightness of 2671 cd m–2, maximum external quantum efficiency of 3.55%, and good EL stability. The proposed KBr-passivated NC strategy will open a new avenue for fabricating efficient, stable, and tunable pure color perovskite NC LEDs.
研究领域:
材料科学
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纳米技术
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光电子学
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光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·2971-2991
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IF 2.8
Liu Huadong,Du Kezhen,Sun Hao
In this study, nitrogen and sulfur co-doped carbon quantum dots (NSCQDs) were prepared by hydrothermal method, carbon nitride (C 3 N 4 ) was fired in a muffle furnace in an air atmosphere, and finally, the ternary heterostructure of NSCQDs, C 3 N 4 and bismuth oxide bromide (BiOBr) was synthesized by a hydrothermal method (NSCQDs/C 3 N 4 /BiOBr). The morphology of the catalyst was observed through SEM and TEM. The chemical bonds were analyzed by XPS and FT-IR to further confirm that NSCQDs and C 3 N 4 were successfully attached to BiOBr. The photocatalytic activity of the synthesized catalysts was studied by degrading RhB under simulated light source. The experiment results showed that under optimal conditions, the degradation rate of RhB by NSCQDs/C 3 N 4 /BiOBr within 20 min was as high as 99.9%, which was much higher than that of pure BiOBr (33.5%). The degradation curve was combined with a pseudo-first-order kinetic model with a kinetic constant of 0.32578 min −1 , which was 17.7 times that of BiOBr (0.01837 min −1 ). Catalyst recycling tests showed that NSCQDs/C3N4/BiOBr had extremely high stability. The active species quenching test showed that \({\text{O}}_{2}^{ \cdot - }\) and 1 O 2 were the main active species during the photocatalytic process. The inhibition effect of NSCQDs and C 3 N 4 on BiOBr photogenerated carrier recombination was analyzed by photoluminescence and transient photocurrent tests. This study is expected to provide an attractive strategy for constructing efficient and environmentally friendly photocatalysts for environmental remediation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Jianxing Liu,Zhe Li,Lin Nie,Xiangxin Xue,Mao Liu
Photocatalytic nitrogen fixation is a promising long-term strategy for NH 3 synthesis, with the development of effective and durable photocatalysts being crucial for achieving high-efficiency N 2 to NH 3 conversion. In this study, we employed vacancy and interface engineering to create bismuth (Bi) nanoparticles on hierarchical oxygen-deficient BiOBr microspheres using a one-step solvothermal approach. These Bi-decorated BiOBr microspheres, featuring oxygen vacancies, achieved a high photocatalytic ammonia synthesis rate of 222.3 μmol·g −1 ·h −1 in pure water under visible light irradiation, which is 3.25 times higher than that of the original BiOBr. Atomic-scale images of the interface between the defective regions of BiOBr and the Bi cocatalyst and several other material characterizations confirmed that the enhanced photoreduction activity of Bi/BiOBr is due to the synergistic effects of the metal Bi and the oxygen vacancies. These results present a straightforward and practical method for designing efficient photocatalysts for nitrogen fixation.
研究领域:
材料科学
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环境科学
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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
Huihui Ding,Huanhuan Wu,Jun Ma,Xiang Li,Shuangshuang Huai,Chengming Zhang,Haibao Zhu,Ping Li,Jie Li,Xiufang Wang,Wenjie Xie
Artificial photosynthesis converting CO 2 into valuable compounds has garnered significant interest. However, the insufficient surface activity sites, weak adsorption capacity of CO 2 and poor electron-hole separation capability hinder CO 2 photoreduction used for practical implementation. Herein, Bi nanoparticles/Bi 24 O 31 Br 10 composite photocatalyst (Bi/BOB) was designed constructed through in-situ reduction of bismuth metal on the surface of ultra-thin Bi 24 O 31 Br 10 nanosheets. Bi/BOB exhibits an excellent ability to reduce CO 2 to CO. The CO 2 reduction rate of the optimized Bi/BOB composite catalyst is 43.07 μmol·g −1 ·h −1 , which is significantly superior to other reported bismuth-based photocatalysts. Experimental characterization and Theoretical simulation calculation reveal that the in-situ reduction of bismuth metal causes significant local lattice distortion and uneven charge distribution, thereby producing a strong interaction between Bi nanoparticles and BOB support. So, it enhances the adsorption and activation of carbon dioxide molecules and reduces the Gibbs free energy barrier during the catalytic reaction. Moreover, the strong interaction helps to enhance the separation of photogenerated charge carriers and stability of catalysts. This study offers research suggestions for the interaction between metal and support to enhance CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 36
·2401297
·
IF 18.5
Lu Wang,Zhen-Huang Su,Yang Shen,Shi-Chi Feng,Feng-Ming Xie,Kai Zhang,Ke-Fan Meng,Xingyu Gao,Jian-Xin Tang,Yan-Qing Li
Metal halide perovskite light-emitting diodes (PeLEDs) are gaining increasing attention as a promising candidate for the new-generation display technology. Although tremendous progress has been witnessed in this field, the device performance of blue PeLEDs still lags far behind that of the green and red counterparts. In this work, an effective interfacial engineering is employed to boost the radiative recombination of blue perovskite film by introducing a multifunctional tetraethyl orthosilicate (TEOS) network on the grain-growth substrate. Benefitting from the strong interaction between the TEOS molecule and perovskite nuclei, the perovskite crystallization dynamics are effectively regulated, contributing to significantly improved emitting film with uniformly distributed halogen and concentrated low-dimensional domain. Additionally, the TEOS network can distinctly passivate the crystal defects at the buried perovskite interface owing to its adequate electron-donating sites. Consequently, the target blue PeLEDs featuring a stable emission peak at 488 nm exhibit a champion external quantum efficiency of 17.3%, which is among the highest values to date. The results demonstrate the critical role of the surface molecular characteristics of the grain-growth substrate in regulating the mixed-halide blue perovskite crystallization.
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Ren Liu,Zhanpeng Chen,Yuehua Li,Lanyu Zhang,Shuangfei Wang,Chongxing Huang
Agricultural waste is a significant global waste issue, and current methods for handling agricultural waste often have negative environmental impacts. In the context of “emission peak” and “carbon neutrality” in the world, the reuse of agricultural waste is of great significance. In this study, an edible film for food preservation packaging was developed, which uses Pouteria campechiana pericarp waste as the substrate, Carboxymethyl cellulose as the film-forming agent, and curcumin as the antibacterial preservative. The film exhibited optimal performance when the carboxymethyl cellulose concentration in this fresh-keeping film was 0.8 wt% and the curcumin concentration was 200 mg kg −1 . Curcumin and carboxymethyl cellulose in the film have synergistic antibacterial effect and can kill microorganisms on the surface of tilapia meat. The film extended the shelf life of tilapia meat by 3 day at 25 °C. The safety and edibility of the film were demonstrated by incorporating it into the feed and administering it to mice , with no observed adverse reactions in the mice. This study underscores the potential of utilizing agricultural waste for the development of eco-friendly packaging films, thereby mitigating carbon emissions. Such advancements can serve as a foundation for creating more environmentally sustainable food packaging strategies.
研究领域:
食品科学
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环境科学
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生物学
✓ 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）