CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ting Qu,Jinpeng Zhang,Jinbo Song,Jieying Jing,Wen-Ying Li
The magnesium oxide (MgO) sorbents doped with different NaNO 3 /NaNO 2 molar ratios were prepared to improve their stability over multiple cycles. Regulating the NaNO 3 /NaNO 2 molar ratio effectively improved the CO 2 adsorption performance of the sorbent. The MgO sorbent with the NaNO 3 /NaNO 2 molar ratio of 0.8 exhibited outstanding performance and stability. Characterization and density functional theory calculations confirmed the positive effects of the appropriate NaNO 3 amount in improving the adsorption activity, whereas the suitable NaNO 2 amount slowed the sintering step and improved stability. Notably, the molten salt remained stable during cycling and did not decompose even at high regeneration temperatures, guaranteeing the cyclic stability of the sorbent. Further characterization showed that the CO 2 sorption drop in the first few cycles was ascribed to the decline in the active surface owing to the aggregation of MgO particles, incomplete regeneration of sorbents, and segregation of molten salt on the sorbent surface.
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
ATMOSPHERIC ENVIRONMENT
·
2020
·
IF 4.039
Yaxin Guo,Na Wang,Shufeng Pang,Yunhong Zhang
Although nitrates and amino acids are ubiquitous in the atmosphere, the interactions of amino acids with nitrates on the hygroscopicity of aerosols are still not clear. We studied the hygroscopic properties and compositional evolution of three atmospherically relevant species, sodium nitrate (NaNO 3 ), glycine and L-alanine (alanine). The investigations on the NaNO 3 , glycine, alanine and their internally NaNO 3 /amino acid mixed particles with molar ratios of 3:1, 1:1 and 1:3 were conducted using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The mixed NaNO 3 /glycine droplets with molar ratios of 3:1, 1:1 and 1:3 exhibited efflorescence transition at 52.3%, 62.6% and 63.2%RH, respectively. For the NaNO 3 /alanine mixed systems with molar ratios of 3:1, 1:1 and 1:3, the efflorescence relative humidity (ERH) was measured to be 50.2%, 59.8% and 69.3%, respectively. These results suggested that in each of the systems studied the addition of amino acids to aerosols could promote the crystallization of mixed droplets. However, the higher deliquescence relative humidity (DRH) with increased fraction of glycine for the mixed NaNO 3 /glycine (3:1, 79.2%RH; 1:1, 86.3%RH; 1:3, 86.5%RH) also indicated that glycine could inhibit the deliquescence phase transition of mixed systems. In the case of NaNO 3 /alanine systems, the DRH for 3:1 and 1:3 mixed particles was 78.2% and 82.7% while no deliquescence transition occurred for the 1:1 mixed particles. The hygroscopic properties of mixed NaNO 3 /amino acids droplets were modified due to the formed amino acid-NaNO 3 complex salts from the interactions of amino acids with NaNO 3 in aerosols during dehydration process. The discrepancies in water content for the mixed NaNO 3 /amino acids with molar ratios of 1:1 and 1:3 between dehydration and hydration processes at high RH could be attributed to the crystallization of amino acid-NaNO 3 complex salts during dehydration and the residual amino acids.
研究领域:
大气科学
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化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 14
·1094
·
IF 4.3
Chuang Zhu,Wenxuan He,Manting Gu,Dan Zhang,Baiyuan Tian
LiNO3-NaNO3-KNO3-NaNO2has a relatively low phase-change temperature, making it suitable for low-temperature heat utilization systems. This study focuses on the performance optimization of the quaternary molten salt to advance its applicability. A series of nanocomposites consisting of nano-SiO2/MgO and the quaternary salt are prepared. Core thermophysical properties, including phase transition behaviors and thermal transport parameters, are quantified. The incorporation of nano-SiO2/MgO induces moderate adjustments to the melting point and latent heat yet demonstrates an obvious enhancement in specific heat capacity. Optimal doping at 0.7 wt.% SiO2and 0.3 wt.% MgO yields a molten-state specific heat of 1.51 J/(g·K), representing a 6% increase over the undoped base salt (1.42 J/(g·K)). By combining the thermal diffusivity properties of the samples, this study found that the doping of nanoparticles typically induces new structures in molten salts that tend to enhance the specific heat capacity while simultaneously reducing thermal diffusivity.
研究领域:
储能
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纳米材料
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热工工程
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
·
IF 3.178
Shijue Wang,Ju Xiao,Fei Yuan,Long Li,Yafei Guo,Yingchun Xie,Tianlong Deng
In order to separate cesium nitrate from the eluant mixture sodium nitrate solution, the phase equilibrium of the ternary system (NaNO 3 + CsNO 3 + H 2 O) at 338.15 K and 0.1 MPa was investigated using the isothermal equilibrium solution method, and the solubilities and physicochemical properties (density and refractive index) of the system were determined, experimentally. According to the experimental data, the phase diagram and physicochemical properties versus the composition diagram of the ternary system at 338.15 K were established for the first time. There is one invariant point (NaNO 3 + CsNO 3 ), two univariant curves, and two crystallizing regions corresponding to NaNO 3 and CsNO 3 . The phase diagram belongs to a simple-type ternary system, and neither double salt nor solid solution was formed. Based on the phase diagrams of this system at 298.15 and 338.15 K, the cycle separation process for CsNO 3 recovery from the eluant of sodium nitrate mixture solution was evolved. It is worth noting that 90.29 % CsNO 3 can be separated from the mixed solution after three cycles. It is significant for the green recovery of cesium nitrate from the eluent solution containing sodium nitrate effectively.
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
MEAT SCIENCE
·
2016
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IF 2.801
Xianchao Feng,Chenyi Li,Xu Jia,Yan Guo,Na Lei,Robert M. Hackman,Lin Chen,Guanghong Zhou
The influence of NaNO 2 content on protein oxidation and nitrosation was investigated in cooked sausages at different concentrations (0, 50, 100, 200 and 400 mg NaNO 2 /kg). Dependent on concentration, NaNO 2 had both anti- and pro-oxidant effects on protein oxidation. The antioxidant effects of NaNO 2 on the protein oxidation were evidenced by significantly lower carbonyl contents, higher free amines and lower surface hydrophobicities. The pro-oxidant effects of NaNO 2 on protein oxidation resulted in a decrease of sulfhydryls and an increase of disulfide bonds. NaNO 2 also improved the protein nitrosation inducing the formation of 3-nitrotyrosine (3-NT). Moreover, 3-NT had significant correlations with parameters of protein oxidation, indicating that 3-NT may be a possible marker for protein oxidation. Results of this study contribute to an understanding of the impact of NaNO 2 on food quality and help to identify optimal formulations of cured meat products .
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2015
·
IF 2.912
Xianchao Feng,Chenyi Li,Niamat Ullah,Robert M. Hackman,Lin Chen,Guanghong Zhou
The stability of cured meat products is increased by the protection of its proteins from oxidation by sodium nitrite (NaNO2) during processing. This study investigated the effects of NaNO2 (0, 50, 100, 200, and 400 mg/kg) on the physiochemical and structural characteristics of myofibrillar protein (MP) in raw and cooked ham. The NaNO2 showed a dose-dependent antioxidant effect, by inhibiting carbonyl formation, dityrosine formation, and denaturation of MP, and a nitrosative effect, through the formation of 3-Nitrotyrosine (3-NT). The 3-NT content within MP of raw ham had distinct negative correlations with sulfhydryl content and surface hydrophobicity. The 3-NT content within MP of cooked ham had significantly negative correlations with carbonyl, sulfhydryl content and turbidity and had significantly positive correlations with disulfide content. These results indicated that 3-NT may be a potential marker for protein oxidation in raw and cooked cured meat products.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Baolin Xia,Ruohan Shi,Wei Wang,Weijun Peng,Yijun Cao,Yukun Huang,Guixia Fan
A substantial stockpile of phosphogypsum (PG) not just consumes land resources, but also poses environmental contamination risks. Herein, the conversion of PG into high-value α-hemihydrate gypsum (α-HH) whisker by the atmospheric pressure salt solution method with simple process, high efficiency and low energy consumption was investigated. Sodium nitrate was found to accelerate the conversion of PG into α-HH, and sorbitol could modify the α-HH into rod-like morphology with high aspect ratios . The α-HH whiskers with an average length of 96.28 µm and an average aspect ratio of 25.47 were prepared within 1.5 h under the optimal parameters of 80 ℃, sodium nitrate-30 wt%, PG-12 wt%, and sorbitol-1 wt%. The modulation mechanism was that hydroxyl groups in sorbitol formed strong hydrogen bonds with the sulfate groups on the lateral of the crystals, which promoted the growth of α-HH along the c-axis. Moreover, the filtrate could be effectively recycled by adding salt medium and crystallization modifier. Such technique provides a theoretical basis for the high-value utilization of PG.
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
Journal of Energy Storage
·
2022
·
IF 8.907
Huikang Yang,Weiyi Zhang,Ying Zhu,Yanqiu Shao,Yingying Shao,Xiaoguang Zhang
Stone-sawing mud (SSM) is a solid waste generated during stone processing, with a presently estimated global production of 30 million m 3 . SSM is usually disposed of in the stone yard, occupying a large area of land and causing serious dust and water pollution. In this study, a novel shape-stabilized composite phase change material (ss-CPCM) containing SSM loaded with NaNO 3 was prepared using the mixing and sintering method for medium-high temperature thermal energy-storage applications. The ss-CPCM retained 50 wt% NaNO 3 without leakage. X-ray diffraction analysis showed good chemical compatibility between the SSM and NaNO 3 , and microscopy analysis demonstrated that NaNO 3 was uniformly distributed within the SSM structure. The compressive strength of the ss-CPCM reached 23.14 MPa. The melting temperature and latent heat of the ss-CPCM are approximately 306.78 °C and 79.86 J·g −1 , respectively, and no significant variations are observed after thermal cycling. The energy storage density of the material is 444.86 J·g −1 in the range of 50–400 °C, and its thermal conductivity is 0.696 W (m·K) −1 . Furthermore, the thermal conductivity of the composites reached 2.421 W (m·K) −1 with the addition of 10 wt% of graphite. Hence, the NaNO 3 /SSM ss-CPCM is considered a promising material for waste heat recovery, thereby providing a valorisation method for the resource utilisation of SSM.
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
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Guiling Luo,Hui Xie,Hamza Abdalla Yones,Si Mi,Binghang Li,Yubao Wang,Pengying Chen,Guangjiu Li,Wei Sun
In this paper the effect of gold nanochains (AuNCs) on direct electron transfer of Myoglobin (Myb) was studied in detail. A Nafion polymer dispersions, Myb solution and AuNCs solution were dropped on carbon ionic liquid electrode (CILE) in sequence to develop a new working electrode. AuNCs have high electrochemical activity with excellent biocompatibility, which serve as electron transfer path for intensifying electrochemical response of Myb. In electrolyte a pair of symmetrical redox peaks of Myb was displayed on cyclic voltammogram and electrochemical performance of this modified electrode was investigated. Myb on electrode surface exhibited good electrocatalytic reduction activity to trichloroacetic acid (TCA) and sodium nitrite (NaNO2). The electrocatalytic current displayed a linearity regression behavior to TCA concentrations from 2.0 to 400.0 mmol/L with the detection limit of 0.26 mmol/L, to NaNO2 concentrations from 0.04 to 1.8 mmol/L with the detection limit of 0.013 mmol/L. Consequently, this paper extended the utilization of AuNCs in construction of an excellent platform based on electrocatalysis of redox enzymes.
研究领域:
生物化学
·
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Chemistry
·
2022
·
IF 3.241
Yanqin Meng,Libin Yang,Qing Xu,Yafei Guo,Tianlong Deng
Ion-selective electrodes directly respond to the activity of target ions without destroying the existing form of the original electrolyte, so ion-selective electrodes have been widely used in various fields. Mean activity coefficient of NaNO3 in the ternary system (NaNO3 + CsNO3 + H2O) at 298.15 K was measured by electromotive force (EMF) with the cell: Na+ ion-selective electrode (Na-ISE)|NaNO3 (mA), CsNO3 (mB)|NO3- ion-selective electrode (NO3-ISE) with total ionic strengths from 0.01 to 4.5 mol·kg-1 at different ionic strength fractions (0, 0.1, 0.2, 0.4, 0.6, and 0.8). The results showed that the Na-ISE and NO3-ISE have a good Nernst response, and the mean activity coefficients of NaNO3 are obtained via the Nernst equation. Based on the data of mean activity coefficients of NaNO3, the relationship diagrams of activity coefficients of NaNO3 against ion strengths in the ternary system were demonstrated, and the Pitzer mixing ion-interaction parameters and were obtained.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2015
·
IF 2.352
Xianxiang Liu,Hui Ding,Qiong Xu,Wenzhou Zhong,Dulin Yin,Shengpei Su
A mild and simple process for the effective oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-diformylfuran (DFF) has been developed using NaNO 2 as the oxidant. Some important reaction parameters were investigated to optimize the oxidation of HMF into DFF. It was found that the reaction solvent was very crucial for this reaction. Trifluoroacetic acid was the best solvent for the oxidation of HMF into DFF by NaNO 2 . Under the optimal reaction condition, almost quantitative HMF conversion and high DFF yield of 90.4% were obtained after 1 h at room temperature.
研究领域:
化学工程
·
有机化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2024
·
IF 3.6
Fengnian Liang,Yiqun Huang,Junjian Miao,Keqiang Lai
Sodium nitrite is a commonly used preservative and color protectant in the food industry. Conventional analytical methods are highly susceptible to food matrix interference, time-consuming and costly. In this study, the ion cross-linking method was employed to prepare alginate hydrogel substrates, and phenosafranin was chosen as a single-molecule probe to analyze sodium nitrite. Our investigation centered on elucidating the effects of alginate and cross-linking ion concentrations on Raman signal characteristics. The optimal Raman response was observed in the precursor solution with 1% sodium alginate and 0.1 mol L−1 cross-linking ions. The relative standard deviations (RSDs) of the feature peaks from the three substrate batches ranged from 1.22% to 16.30%, attesting the robustness and consistency of the substrates. The signal reduction of the substrates after a four-week storage period remained below 10%, indicating that the substrates had good reproducibility and stability. The limits of detection (LODs) for sodium nitrite in extracts from cured meat, luncheon meat, and sliced ham were determined to range from 3.75 mg kg−1 to 8.11 mg kg−1, with low interference from the food matrix. The support vector machine algorithm was utilized to train and predict the data, which proved to be more accurate (98.6%–99.8% recovery) than the traditional linear regression model (81.9%–112.7% recovery) in predicting the spiked samples. The application of hydrogel-based surface-enhanced Raman spectroscopy (SERS) substrates for nitrite detection in food, combined with machine learning for regression prediction in data processing, collectively augmented the potential of SERS technology in the field of food analysis.
研究领域:
食品科学
·
分析化学
·
生物医学工程
✓ 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）