JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2019
·
IF 2.6
Wei Zhao,Kunfeng Li,Peng Lin,Kai Xu,Shengheng Tan
Some particular hazardous and nuclear wastes containing a large amount of chlorine would cause the problematic processing during the waste vitrification, because of the low solubility of Cl in silicate glasses . Although a few works reported the chlorine behavior in aluminosilicate glasses, the results do not always show the consistency and a small variation of glass compositions may cause the significant changes. The present work studied the dissolution of Cl in the range of alkaline earth aluminosilicate glasses with the nominal mole composition of 50SiO 2 -10Al 2 O 3 -40AeO (Ae = Ca, Sr or Ba). The solubility of Cl in the glasses with different alkaline earth species followed the order of Ca (~8.1 wt%) > Sr (~6.0 wt%) > Ba (~3.5 wt%). The glass density and glass transition temperature decreased with the addition of Cl in three types of glasses, and AeCl 2 salts, identified with X-ray diffraction, segregated from the glasses, when Cl addition exceeds its solubility. Raman spectra indicate the dissolution of Cl leads to the increase of bridged oxygen bonds in glasses, supposing that Ca 2+ ions are attracted by Cl − ions, leaving the non-bridging oxygens that initially associated with Ca 2+ ions are bonded to Si 4+ (Al 3+ ) to become bridging oxygens.
研究领域:
材料科学
·
核废料处理
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DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2017
·
IF 5.099
Lingjun Kong,Meina Han,Kaimin Shih,Minhua Su,Zenghui Diao,Jianyou Long,Diyun Chen,Li'an Hou,Yan Peng
Recovering phosphorus (P) from waste streams takes the unique advantage in simultaneously addressing the crisis of eutrophication and the shortage of P resource. A novel calcium decorated sludge carbon (Ca-SC) was developed from dyeing industry wastewater treatment sludge by decorating calcium (Ca) to effectively adsorb phosphorus from solution. The X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques were used to characterize the Ca-SCs, followed by isotherm and kinetic sorption experiments. A preferred design with CaCO 3 to sludge mass ratio of 1:2 was found to have a sorption capacity of 116.82 mg/g for phosphorus. This work reveals the crucial role of well-dispersed nano-rod calcium on the Ca-SC surface for the sorption of phosphorus. Moreover, the decoration of nano-rod calcium was found to further promote the uptake of phosphorus through the formation of hydroxylapatite (Ca 5 (PO 4 ) 3 (OH)). Thus, the development of decorated Ca-SC for sorption of phosphorus is very important in solving the P pollution and resource loss.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Jingrui Liu,Yimin Xuan,Liang Teng,Qibin Zhu,Xianglei Liu
Ca-looping thermochemical energy storage is considered to be an efficient and low-cost thermal energy storage technology for third-generation concentrated solar thermal power generation. However, the limitation of conventional kinetic studies cannot satisfy the direct solar driven calcination reaction mechanism. Therefore, a direct solar-driven calcination kinetics function of calcium carbonate particles based on multivariate nonlinear regression method is proposed. This scheme driven by full-wavelength solar energy has widely universality and application taking the effects of particle size, porosity, doping composition, temperature and CO 2 concentration into account, which intuitively reflects the essence of photothermal conversion characteristics and reveals the mechanisms of photothermal calcination reactions. The heat storage efficiency of Fe:Mn:Al modified calcium carbonate particles after 20 cycles is 93.03%, the spectral absorption rate is 84.27%. This work provides a new idea for the in-depth study of the decomposition kinetics of solar-driven calcium-based particles.
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DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Wen-jia Yin,Jing-xian Zhang,Hong Wang,Yu Wang,Xi Zeng,Zhen-lin Xu,Jin-yi Yang,Zhi-li Xiao,Bruce D. Hammock,Peng Wen
For monitoring of the residual of parathion pesticide in food, herein, a sensitive and reliable electrochemical immunosensor based on cross-linked polyvinyl alcohol/citric acid nanofiber membrane (PVA/CA NFM) and horseradish peroxidase labeled anti-parathion nanobody was constructed. Firstly, the cross-linked PVA/CA NFM with extra-high surface area and uniform morphology was prepared and characterized. Then, the immunosensor was assembled and its analytical performances were evaluated. It exhibited high specificity and sensitivity to parathion with the liner range and limit of detection being 0.01–100 ng/mL and 2.26 pg/mL, respectively. Moreover, the biosensor kept almost 75% of its initial activity after regenerating 4 times, and remained 85% after 9 weeks of storage. Finally, the average recoveries from food samples were 96.20%–114.61% with the coefficient of variation being 1.06%–5.28%, which was correlate well with UPLC (R 2 = 0.9964). Therefore, the sensor was demonstrated to be a feasible alternative for sensitive assay of parathion.
研究领域:
分析化学
·
食品科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2017
·Vol. 52
·期 5
·1700009
·
IF 1
Tianxiang Xu,Yicheng Wang,Dazhi Lu,Zhongben Pan,Haohai Yu,Huaijin Zhang,Jiyang Wang
Barium calcium titanate (Ba 1-x Ca x TiO 3 , BCT), which can be used as a three-dimensional nonlinear photonic crystal, is an anomalous ferroelectric with tremendous electromechanical response. Its phase transition behavior depends closely on the Ca content. In particular, the rhombohedral-orthorhombic and orthorhombic-tetragonal transitions can disappear at two contents: x = 0.18 and 0.23, respectively, which is important to study a wide range of physical phenomena including the alluring quantum effects. In this work, based on the natural differences of the affinity of oxygen atoms on Ba and Ca atoms, we developed a growth atmosphere modulating mechanism to control the Ca content in BCT crystals aiming at achievement of the desired compositions (x = 0.18 and 0.23). With the same polycrystalline material (Ba 0.773 Ca 0.227 TiO 3 ), BCT single crystals with x = 0.189 and x = 0.225 were obtained under N 2 and air atmospheres, respectively. The structural and dielectric properties of the as-grown crystals were investigated and the differences were discussed. Besides, the influence of Ti 3+ imperfections on the diffused phase transition was studied, and the specific heats and transition enthalpies were also measured for characterizing the different phase transition properties.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2016
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IF 2.628
Junjie Zhang,Fang Lu,Weiqiang Yu,Rui Lu,Jie Xu
Lactic acid is produced as a major byproduct during sorbitol hydrogenolysis under alkaline conditions. We investigated the effects of two different alkaline additives, Ca(OH) 2 and La(OH) 3 , on lactic acid formation during sorbitol hydrogenolysis over Ni/C catalyst. In the case of Ca(OH) 2 , the selectivity of lactic acid was 8.9%. In contrast, the inclusion of La(OH) 3 resulted in a sorbitol conversion of 99% with only trace quantities of lactic acid being detected. In addition, the total selectivity towards the C2 and C4 products increased from 20.0% to 24.5% going from Ca(OH) 2 to La(OH) 3 . These results therefore indicated that La(OH) 3 could be used as an efficient alkaline additive to enhance the conversion of sorbitol. Pyruvic aldehyde, which is formed as an intermediate during sorbitol hydrogenolysis, can be converted to both 1,2-propylene glycol and lactic acid by hydrogenation and rearrangement reactions, respectively. Notably, these two reactions are competitive. When Ca(OH) 2 was used as an additive for sorbitol hydrogenolysis, both the hydrogenation and rearrangement reactions occurred. In contrast, the use of La(OH) 3 favored the hydrogenation reaction, with only trace quantities of lactic acid being formed.
研究领域:
化学工程
·
催化反应
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 14
·2398
·
IF 5.719
Chunhui Song,Qifa Song,Ziyou Ding,Yingchao Han
In this study, we synthesized polyacrylic acid (PAA)-Ca (Eu) nanoclusters as a luminescence sensor of phosphate ion by a complex method, and we aimed to achieve the quantitative detection of PO43−based on the sensitivity of the charge transfer band of Eu3+to anionic ligand. The resulting PAA-Ca(Eu) nanoclusters showed a well-dispersed and a dot-like morphology, with an ultra-small diameter (the average size of 2.17 nm) under high resolution transmission electron microscopy(HRTEM) observation. A dynamic light scattering particle size analyzer (DLS) showed a hydrodynamic size of 2.39 nm. The (PAA)-Ca (Eu) nanoclusters as a luminescence sensor showed a significantly higher sensitivity for PO43−than other anions (CO32−, SiO32−, SO42−, SO32−, Br−, Cl−, F−). The luminescence intensity displayed a linear increase (y = 19.32x + 74.75, R2> 0.999) in a PO43concentration range (0–10 mM) with the concentration of PO43−increase, and the limit of detection was 0.023 mM. The results showed good recovery rates and low relative standard deviations. These (PAA)-Ca (Eu) nanoclusters are hopeful to become a luminescence sensor for quantitatively detecting PO43−.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
Optical Materials Express
·
2018
·Vol. 8
·期 6
·1425-1434
·
IF 2.566
Cong Pan,Jun-Cheng Zhang,Min Zhang,Xu Yan,Hong-Di Zhang,Yun-Ze Long,Xin-Yuan Sun,Hai-Tao Jiang
Isomorphic materials tend to exhibit differentiated performance due to the small differences between the constituent atoms and the crystal structures. Inspired by the isomorphic strategy, herein we developed a novel trap-controlled mechanoluminescent (TC-ML) material, Pr3+-activated Sr2Nb2O7, that shows mechanoluminescence (ML) under the mechanical actions of compression and friction. Compared to the isomorphic Ca2Nb2O7:Pr3+ which requires a long-time delay to achieve high-contrast ML due to the strong long-lasting afterglow, Sr2Nb2O7:Pr3+ enables the obtaining of high-contrast ML in a short-time delay because of the weak short-lasting afterglow, which greatly simplifies the imaging process to facilitate the further application of ML. The investigations of structural and optical characteristics between Sr2Nb2O7:Pr3+ and Ca2Nb2O7:Pr3+ reveal that the unique ML of Sr2Nb2O7:Pr3+ should result from its lower trap concentration and shallower trap depth relative to Ca2Nb2O7:Pr3+. Our results are expected to deepen our understanding on the behavioral diversity of isomorphic phosphors and thereby broaden the horizon of designing and regulating TC-ML materials.
研究领域:
材料科学
·
光学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qin Huang,Ruijun Qian,Bingshou Gong,Habibullah,Ji Zhou,Xue Yao,Yao Wang,Yigang Yan,Yungui Chen,Chaoling Wu
Mg-Ca-hydride-based materials are ideal portable H 2 source owing to excellent hydrolysis properties. However, when exposed to air, there is an explosion risk and serious hydrolysis property degradation due to the reaction with steam in air. In this work, by adding 5 wt% expanded graphite, 8 wt% AlCl 3 and 5 wt% polyethylene glycol 1000, the H 2 yield of a 30 wt% Ca-Mg alloy hydride plate after 4 h air exposure (80 RH%, 25 °C) is increased to 2.3 times that of the original sample without any attenuation. Furthermore, when 15 wt% polyethylene glycol 1000 was added, the attenuation rate after 24 h air exposure is decreased by 43 %. The characterization results show that Ca 4 Mg 3 H 14 is more easily hydrolyzed than MgH 2 . First-principles calculations demonstrate that Ca 4 Mg 3 H 14 interacts with H 2 O molecules more strongly, owing to larger adsorption energy to H 2 O. By adding appropriate amounts of expanded graphite, AlCl 3 and polyethylene glycol 1000, combined with pressing technology, the direct contact between the material and air can be delayed. Simultaneously, the hydrolysis performance of the material itself can be improved contributed to destruction of the Mg(OH) 2 passivation layer by expanded graphite and AlCl 3 , thereby jointly enhancing the long-term storage performance. This work may advance the engineering application of Mg-Ca-based hydrolysis materials.
研究领域:
材料科学
·
无机化学
·
能源化学
·
氢能源
·
功能材料
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Panpan Wang,Meiyu Shi,Bochen Zhao,Yuan Shu,Qiang Niu,Pengfei Zhang
Carbide residue, a highly alkaline industrial solid waste generated during acetylene production, is primarily composing of Ca(OH) 2 . In this study, a top-down solid-state redispersion strategy. By synergizing mechanochemical activation with surfactant capping, we achieving the recycling of carbide residue to synthesize Ca(OH) 2 -CTAB anosheet-based desulfurization agent. The resultant material exhibits a significantly enhancing BET specific surface area (30.2 m 2 ·g −1 ) and abundant pore architecture. Comparative evaluations with Ca(OH) 2 -P123 and raw carbide residue revealing the superior performance of the Ca(OH) 2 -CTAB adsorbent, demonstrating a sulfur dioxide adsorption capacity of 2.57 mmol·g −1 is a 2-fold improvement over untreating carbide residue. Furthermore, significantly extends the fixed-bed penetration time to 43869 seconds. Comprehensive characterization through TG, FTIR, BET, SEM, TEM, and AFM elucidating the relationship between the nanosheet morphology and its exceptional desulfurization performance. This work provides a green methodology for upcycling industrial alkaline waste into functional nanomaterials for environmental remediation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Rui Xiao,Wen-Dong Yao,Wenhao Xing,Chunlan Tang,Wenwen Jiang,Sheng-Ping Guo,Wenlong Yin
Adjusting the structure of compounds through an anion partial substitution strategy is an effective means to explore nonlinear optical (NLO) materials. Here, a new oxysulfide Ca3Ge2O3S4 (CGOS) crystallized in the centrosymmetric (CS) space group P21/c was synthesized by a high-temperature solid–solid reaction. Taking CGOS as the parent, the first quaternary NLO Ca-based oxyselenide Ca3Ge2O4Se3 (CGOSe) crystallized in the noncentrosymmetric (NCS) space group R3m was obtained by anion partial substitution. The 0D structure of CGOS consists of isolated [Ge2O3S4] dimers, with Ca2+ ions located between dimers to balance the charge. The 0D structure of CGOSe consists of isolated and parallelly arranged [Ge2O4Se3] dimers, with Ca2+ ions located between dimers to balance the charge. The structural evolution between CGOS and CGOSe is elucidated. CGOSe has the widest band gap of 3.02 eV in the AE3Ge2O4Q3 (AE = Ca, Sr, Ba; Q = S, Se, Te) system. Apart from the obvious NLO activity, CGOSe exhibits a high laser-induced damage threshold of around 3.2 × AgGaS2. The theoretical calculation results show that the [Ge2O4Se3] dimer is the main source of the SHG response. This work enriches the relatively less-explored Ca-based oxychalcogenides as NLO materials.
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Panpan Wang,Meiyu Shi,Yuan Shu,Qiang Niu,Pengfei Zhang
Daily discarded egg residues such as eggshells reach an astronomical figure around the world, causing severe environmental pollution and waste of Ca-based sources. CaCO 3 , especially these porous CaCO 3 nanoparticles, could role as an effective plastic stuffing, filler, ink filler, and adsorbent, having a great prospect for industrial application. Herein, based on a solid-state reaction between strong and weak acids, we successfully prepared a porous CaCO 3 -es with the BET specific surface area (SSA) up to 97.4 m 2 /g, and meanwhile with abundant mesopores and tiny small CaCO 3 primary nanoparticles about 7.4 nm. Notably, the prepared CaCO 3 -es showed significantly improved CO 2 adsorption capacity than the contrast CaCO 3 samples in both static and breakthrough tests. According to the characterization such as FTIR, Raman, XPS, TEM, and DFT calculations, the high CO 2 adsorption of CaCO 3 -es originated from its high porous structure, small nanoparticle size, and rich defective sites.
研究领域:
材料科学
·
环境科学
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）