CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ce Li,Xu Zhang,V.C. Onah,Weiling Yang,Zhuang Leng,Xiliang Jiang,Fangming Zhang,Shasha Li,Yong Zhang,Yu Han,Huisheng Liu,Chun Li,Dingfu Zhou,Fanming Zeng
In analyzing the effect of alkali metal and alkaline earth metal oxide on the properties of tellurite glass , a series of tellurite glass samples doped with alkali metals and alkaline earth metals were prepared based on the TeO 2 -WO 3 -GdF 3 glass system by melt quenching method. Through tests and comprehensive analysis, the results show that after the F − ions successfully enter the glass network, the substitution of TeO 2 by alkali and alkaline earth metals could reduce the molar volume , which means the glass becomes more compacted. The influence on the glass network is mainly shown in [TeO 3 ] and [TeO 4 ] units. Alkali metals and alkaline earth metals could increase the asymmetry of the TWG: Eu 3+ glass network, shorten the critical distance, and increase luminescence intensity by 8.6 times and improve color purity to 94%. In addition, alkali metals could prolong the fluorescence lifetime , while alkaline earth metals could shorten it. Te 4+
研究领域:
材料科学
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光学材料
·
玻璃物理
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发光光谱学
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无机化学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Bingbing Liu,Yubi Wang,Li Zhang,Bei Zhang,Jia Wang,Yuanbo Zhang,Guihong Han
Ferrites with a typical AB 2 O 4 structure are excellent soft magnetic material precursors . One progress for preparation of manganese ferrite is to use the minerals as raw materials. However, the inclusive impurities, such as Ca and Si, may dope in the AB 2 O 4 structure and have an adverse effect on the magnetism of ferrites. In this work, the effects of CaO and SiO 2 on the crystalline structure transformation, interfacial elements distribution, and magnetism change of the MnO 2 -Fe 2 O 3 -CaO-SiO 2 system for preparation of high-performance ferrite materials were systematically investigated. It's found that Ca ions can readily be doped in the sit A of spinel-type structure to form Ca a Mn b Fe 2 O 4 , and the magnetism of manganese ferrite was observably declined due to the Ca doping. A diffusion couple of synthetic Ca a Mn b Fe 2 O 4 and SiO 2 was designed to determine the Ca migration. Results demonstrated that regulation of Ca out of sit A from the spinel-type structure can be successfully realized via adjusting the CaO/(CaO + SiO 2 ) mass ratio below 0.55, and the magnetism of ferrite after Ca migration was obviously enhanced. The migrated CaO combined with SiO 2 to form calcium silicate which was distributed at the boundaries of ferrite particles. Eventually, the verification test of low-grade manganese ores with CaO and SiO 2 impurities was conducted to validate the Ca migration effect.
研究领域:
材料科学
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磁性材料
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矿物加工
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固态化学
✓ 已验证
DOI
高影响因子
Sustainable Chemistry and Pharmacy
·
2026
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IF 5.8
Jin-Yue Dong,Rong-Jie Wang,Qing Ran,Xiao-Bei Yang,Wen-Chao Han,Feng-Qi Dong,Di Chen
A novel microextraction method based on switchable natural deep eutectic solvents (SNADES) was developed for the determination of illicitly added non-steroidal anti-inflammatory drugs (NSAIDs) in herbal extracts, enabling one-step phase separation and magnetic retrieval of the extractant. The addition of ammonia solution induces the reversible transition of the hydrophobic SNADES (menthol:decanoic acid = 1:1) to a hydrophilic state, thereby significantly enhancing the extraction efficiency of the target analytes. Citric acid-modified Fe 3 O 4 composites (Fe 3 O 4 @CA) were employed to achieve rapid phase separation and efficient magnetic retrieval of the SNADES phase. After systematic optimization, the optimal conditions were established as 30 μL of SNADES, 70 mg of citric acid, 4 mg of Fe 3 O 4 , an extraction time of 4 min, and 100 μL of acetonitrile for desorption. Under the optimal conditions, four NSAIDs (flurbiprofen, diclofenac sodium, ibuprofen, and ketoprofen) exhibited good linearity over the concentration range of 0.1–20 μg/mL, with correlation coefficients (R 2 ) ≥ 0.993. The method provided relative recoveries of 93.7–109.2 % for the target analytes, with relative standard deviations (RSDs) ≤ 9.7 %. The limits of detection were in the range of 0.016–0.036 μg/mL. Spiked recovery experiments in real herbal extracts confirmed the method's accuracy (96.0–112.3 %), demonstrating that the proposed approach provides a rapid, efficient, and green sample preparation strategy for the screening of illicit synthetic drugs in herbal products.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·123034
·
IF 7.5
Lin Yue,Shiqi Xing,Xiaoyun Han,Wang Liang,Yanfang Liu,Xinyang Liang,Yonghui Han
In this paper, a Bimetallic MOF material Ce-Fe-MI was doped in cellulose acetate (CA) to form a composite catalyst Ce-Fe-MI/CA for catalytic ozonation degradation of tetracycline (TC) wastewater. When the mass ratio of Ce-Fe-MI to CA is 0.45:1, the removal rate of Chemical Oxygen Demand(COD) reaches 95.04% in 90 min. The Ce-Fe-MI/CA catalyst exhibits high stability, with only a 4.61% decrease in the removal of COD after four cycles of use. The active components such as •OH and 1 O 2 are produced during the Ce-Fe-MI/CA catalyzed ozonation process. Density functional theory (DFT) simulations demonstrate distinct roles of metallic sites: Ce sites dominate TC adsorption, whereas Fe sites activate catalytic ozonation. The electron transfer between Ce and Fe can effectively regulate the surface valence state and rapidly activate surface adsorbed reactants. Furthermore, the presence of oxygen vacancies in the Ce-Fe-MI/CA framework significantly enhances the catalytic performance. The air flotation-catalytic ozonation coupling process is applied to the treatment of actual pharmaceutical wastewater. The coupled system runs continuously for 480 min, and the effluent COD kept below 50 mg·L −1 .
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DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 20
·9528-9538
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IF 9.931
Yali Weng,Zhenzhang Weng,Zhiyu Liang,Haixia Lyu,Zanyong Zhuang,Yan Yu
Intricate Fenton-like catalysts composed of mixed transition metal oxides (TMOs) frequently outperform simple TMOs in scavenging organic contaminants in wastewater. Nonetheless, their activity and/or reusability may sharply decline when abundant heavy metal ions in wastewater adsorb on the catalytic surface and passivate it. This study shows that mesoporous Ca–Mn mixed oxides prepared from a facile combination of Mn and an alkaline earth metal (i.e., Ca) (denoted as CaMnx) can readily overcome this problem. CaMnx without any additive (e.g., H2O2) was able to degrade organic contaminants (e.g., indigo carmine as a model contaminant) fast within 10 seconds, outperforming many other reported heterogeneous Fenton catalysts. Besides organics, the coexisting heavy metal ions (e.g., Cu2+ and Pb2+ as indicators) were also rapidly extracted. The outstanding performance was attributed to the synergy of Ca and Mn. CaO in CaMnx efficiently extracted metal ions via an ion exchange process, and MnOx generated abundant H2O2 and degraded the organics through an uncommon Fenton-like reaction. Therein, Cu species extracted by CaO catalyzed the decomposition of H2O2 into HO˙ radicals, speeding up the degradation reaction of the organics by 81 times. Benefiting from the gradual exposure of fresh Mn-sites protected by unreacted CaO, CaMnx without regeneration treatment maintained high efficiency in scavenging organics and heavy metal ions in cycling tests. CaMnx also showed great promise in treating complex water samples containing various heavy metal ions (e.g., Pb2+, Cu2+, Cd2+, Ag+, Zn2+ and Cr3+) and organic pollutants. The findings of this work enrich the rational design of related functional nanomaterials.
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Mamuhe Yeerlan,Meng Zhang,Pengpeng Dai
Fe 3+ ions as near-infrared (NIR) activators are emerging as an alternative to Cr 3+ . 1–5 However, it is a challenge to develop Fe 3+ -activated NIR phosphors featuring tunable optical properties, high efficiency, and thermal stability. Herein, we present a series of near-unity internal quantum efficiency (IQE), wavelength-tunable and thermal stability NIR-emitting phosphors Sr 2− y Ca y Sc 1− x SbO 6 : x Fe 3+ (S 2− y C y S 1− x S: x Fe 3+ ). Sr 2 ScSbO 6 :1%Fe 3+ (SSS:1%Fe 3+ ) phosphor shows broadband NIR emission at 904 nm and near-unity IQE under excitation at 300 nm. Experimental and theoretical calculation results demonstrate that introduced Ca ions could increase the bandgap value and Debye temperature (Θ D ) of host from E g = 3.702 eV, Θ D = 609 K of y = 0 to E g = 3.801 eV, Θ D = 692 K of y = 2. Significantly, the resultant S 2− y C y S 1− x S:1%Fe 3+ NIR phosphors show wavelength-tunable emission from 904 to 952 nm and high IQE of 84.6%–97.5% as well as enhanced thermal stability ( I 423K / I 298K = 76.9%) of Ca 2 ScSbO 6 :1%Fe 3+ (CSS:1%Fe 3+ ) in comparison with that ( I 423K / I 298K = 70.6%) of pristine sample. We fabricated an NIR light-emitting diodes (LED) device by using CSS:1%Fe 3+ NIR phosphors with ultraviolet LED chip and demonstrated its potential applications in anticounterfeiting, information encryption, and night vision.
研究领域:
材料科学
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光学
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光子学
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固体物理
✓ 已验证
DOI
高影响因子
Corrosion Communications
·
2021
·
IF 0
Shuaihang Qiu,Huimin Xiang,Fu-Zhi Dai,Hailong Wang,Yanchun Zhou
The protecting materials of reference electrode with good corrosion resistance to molten salts play vital roles in realizing smelting of refractory and rare earth metals through fused salts electrolysis. BaZrO 3 has been considered as a candidate protecting material of reference electrode for its good chemical stability and high-temperature corrosion resistance. However, the unsatisfactory corrosion resistance to molten salts hinders its practical application. In order to enhance the corrosion resistance to molten salts, three perovskite structured high-entropy oxides HE (Ca,Sr,Ba) TM O 3 including (Ca,Sr,Ba)(Zr,Hf)O 3 , (Ca,Sr,Ba)(Zr,Ta)O 3 and (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 , were designed and prepared in this work. The as-prepared HE (Ca,Sr,Ba)(Zr,Hf)O 3 and (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 ceramics are single-phase, while the as-prepared HE (Ca,Sr,Ba)(Zr,Ta)O 3 ceramic contains 11.6 vol.% of (Ca,Sr,Ba) 2 Ta 2 O 7 . These HE (Ca,Sr,Ba) TM O 3 ceramics possess better corrosion resistance to molten NaCl-KCl salts than BaZrO 3 , among which (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 shows the best corrosion resistance to molten NaCl-KCl salts. The mass loss per unite area of HE (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 after corrosion by molten NaCl-KCl salts at 800 °C for 8 h is mere 2.6×10 −6 g/mm 2 which is ca . 1/60 of that of BaZrO 3 (∼1.7×10 −4 g/mm 2 ), and its surface after corrosion is plain and smooth without any new phase detectable after corrosion. It also exhibits better corrosion resistance to molten NaF-KF salts than BaZrO 3 . The mass loss per unite area after corrosion by molten NaF-KF salts at 800 °C for 8 h is only 2.9×10 −5 g/mm 2 which is smaller than that of BaZrO 3 (3.6×10 −5 g/mm 2 ), the corrosion caused by molten NaF-KF salts only occurs on the surface and the thickness of the corrosion layer is mere ∼8 µm, being less than 1/10 of that of BaZrO 3 (∼100 µm). These results indicate that the three HE (Ca,Sr,Ba) TM O 3 , especially (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 , are promising as protecting materials of reference electrode for the smelting of refractory and rare earth metals through fused salts electrolysis.
研究领域:
材料科学
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冶金工程
·
电化学
✓ 已验证
DOI
FOOD HYDROCOLLOIDS
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2020
·
IF 7.053
Xin-Sheng Qin,Zhi-Gang Luo,Xiao-Lin Li
In this study, we demonstrated the role of W 1 /O/W 2 double emulsion with alginate-Ca-EDTA system on the gastrointestinal digestion viability of Lactobacillus Plantarum strain liquid. The W 1 /O/W 2 double emulsion was prepared by WPI-EGCG covalent conjugate nanoparticles with compartmented multiple-emulsion nature. The effects of preparation parameters containing polyglycerol polyricinoleate content, oil fraction, and WPI-EGCG covalent conjugate particle concentration on the formation of W 1 /O/W 2 double emulsions were systematically studied. Then, the rheological properties of alginate-Ca-EDTA system in the external aqueous phase of the W 1 /O/W 2 double emulsions as the pH changes were investigated. The W 1 /O/W 2 double emulsion maintained in the hydrogel state at pH below 4.0 because of Ca 2+ coupled with G residues of alginate . In contrast, the W 1 /O/W 2 double emulsion transformed to solution state at neutral pH condition, which caused the dissociation of Ca 2+ from the Ca-alginate hydrogel and resulted in Ca-EDTA chelation. A pH-sensitive carrier based on an alginate-Ca-EDTA system in a set-type W 1 /O/W 2 double emulsion model was exploited by regulating the release of Ca 2+ . Based on the pH-sensitive alginate-Ca-EDTA system and middle oil phase resistance, such a double emulsion supplied a colon-targeted release carrier for the Lactobacillus Plantarum strain liquid encapsulation into inner aqueous phase with the functional protection effect. The results offer a promising strategy for probiotics strain liquid encapsulation of double emulsion delivery systems in oral applications of foods (such as yogurt, fruit juice or cheese) and pharmaceuticals.
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Chang-Yu Meng,Feng Feng Huang,Qin Yao Li,Lei Geng
Introduction of divalent metal oxides into the TeO2 matrix can produce the chemical formula Mn[TemO2m+n] ≡ (MO)n(TeO2)m, compounds in which divalent metal oxides provide oxygen ions to the parent compound TeO2, to cleave neutral Te–O net to form various tellurium(IV) oxide anion [TemO2m+n]2n− and divalent metal cations as balanced charges. [TemO2m+n]2n− can form isolated anion, discrete polyanion, one-dimensional chain and ribbon polyanion, two-dimensional (2D) layered polyanion, and 3D tunnel polyanion depending on the ratio of MO/TeO2. In this work, a new type of inorganic compound AE2[Ni(Te4O10)Cl2] ≡ [(AEO)2(TeO2)4](NiCl2) (AE = Ca, Sr, Ba, Pb) can be obtained by introducing NiCl2 into the compound AE2[Te4O10] ≡ (AEO)2(TeO2)4 (AE = Ca, Sr, Ba, Pb). In AE2[Ni(Te4O10)Cl2] ≡ [(AEO)2(TeO2)4](NiCl2), AEO acts as a structural shearing agent to cleave the neutral Te–O layered structures of parent TeO2 into [Te4O10]4– anionic fragments, and the introduced NiCl2 acts as an “adhesive” to recombine [TemO2m+n]2n− anionic fragments to form new [Ni(Te4O10)Cl2] anionic framework and does not provide additional oxygen ions to cleave the parent compound TeO2. AE2[Ni(Te4O10)Cl2] compounds feature 2D 2∞[Ni(Te4O10)Cl2] anionic layers composed by TeO4E, TeO3+1E (where E is the lone pair of electrons of TeIV) distorted trigonal bipyramid, and NiO4Cl2 octahedra, and the spaces between 2∞[Ni(Te4O10)Cl2] layers are filled with AE2+ cations (acting as charge balance) as well as E (protruding from sides of the layers). The optical band gaps of AE2[Ni(Te4O10)Cl2] (AE = Ca, Sr, Ba, Pb) were evaluated to be ∼3.69 eV through extrapolating the UV–vis–near-infrared optical absorption spectra. Thermogravimetric and differential scanning calorimetry measurements indicate that Ca-, Sr-, Ba-, and Pb-compounds are stable below 787, 716, 648, and 517 °C, respectively, under flowing N2 atmosphere. The effective moments estimated by Curie–Weiss equation show that the Ni2+ cations of AE2[Ni(Te4O10)Cl2] (AE = Ca, Sr, Ba, Pb) are all in high-spin ground states.
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 11
·4701-4716
·
IF 3.553
Ma Jianfeng,Zhao Hongxia,Shang Yazhuo,Peng Changjun,Liu Honglai,Zheng Shuzhen,Wang Tao,Qi Shuai,Ran Qianping
Abstract The presence of a highly alkaline environment or large amounts of Ca 2+ in concrete exerts a great influence on the dispersion of graphene oxide (GO) particles. Therefore, the development of a highly efficient GO dispersant to adapt to complex concrete environments is important. In this work, novel phosphate-modified small molecular polydentate polymers were synthesized and used as efficient dispersants for cement and high-concentration GO solutions. The chemical structure of the polymers was confirmed by 1 H NMR and IR spectroscopy, and the effect of adsorption groups on the adsorption ability of polymers was studied by using adsorption experiments and theoretical calculations. Results showed that the dispersant inositol hexaphosphate–methoxy polyether (IHP-MP) features a high adsorption equilibrium constant and strong adsorption ability. IHP-MP exhibited not only good water-reducing and slump-retaining properties but also remarkable cement hydration-retarding effects due to its numerous phosphate groups. IHP-MP could be used as an auxiliary GO dispersant with the comb polymer PCE to effectively reduce the viscosity and improve the stability of GO solutions. SEM, TGA and IR characterization indicated that IHP-MP strongly interacts with the surface groups of GO particles. Graphic Abstract
研究领域:
材料科学
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化学工程
·
聚合物化学
·
土木工程
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Jida Wang,Feng Shi,Can Liu,Yi Lu,Xu Lin,Defa Hou,Jirong Li,Dechao Wang,Zhifeng Zheng,Yunwu Zheng
In this study, a series of cost-effective and eco-friendly Ca-Mg-Al and Ni-modified Ca-Mg-Al catalysts were successfully synthesized with different methods (coprecipitation, impregnation and mechanical mixing method) and applied to catalytic pyrolysis vapor upgrading of oleic acid (OA) to produce gasoline-kerosene rich production using methanol as a hydrogen donor . In addition, the effects of the process parameters (catalyst type, OA to methanol ratio, pyrolysis/catalytic temperature, catalyst loading, feedstock injection volume) on the product yield and selectivity were explored, and the reuse properties and deactivation mechanism were also evaluated. Active Ni species coupled with methanol were more conducive to enhancing the catalyst activity and OA conversion and obviously increased the selectivity toward the gasoline-kerosene product. The impregnation method was favorable for the formation of NiAl 2 O 4 species, and coprecipitation method suppressed the formation of NiAl 2 O 4 species. The enhanced activity and deoxygenation selectivity of the coprecipitation method (NiCaMgAl) at lower pyrolysis temperatures was attributed to the abundant higher specific surface area and pore size, higher active metal oxide (Ni 2+ ) and well-active Ni dispersion with a smaller particle size, as well as the lower acidity and partially oxidized Ni, which suppressed the NiAl 2 O 4 spinel phase formation compared with the Ni/Ca-Mg/Al (impregnation) and Ca-Mg-Al (mixing) catalysts, which was beneficial to the decarbonylation/ decarboxylation reaction and inhibited the hydrocracking reaction of C C. Therefore, 100% conversion, 97.12% hydrocarbon yield, 54.53% gasoline and 58.80% kerosene content over NiCaMgAl catalyst were obtained under optimal conditions (pyrolysis/catalytic temperature = 450/500°C, catalyst loading = 1.5 g, feedstock injection volume = 0.1 ml/min and OA to methanol ratio = 3:1). Moreover, NiCaMgAl catalyst also demonstrated good reusability and hydrothermal stability performance due to the lower amount of coke deposition with a lower graphitized structure, which suppressed sintering.
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Lu Liu,Enling Hu,Haoyu Qiu,Qian Xu,Kun Yu,Ruiqi Xie,Fei Lu,Qi Wang,Bitao Lu,Qing Li,Guangqian Lan
Skin wound healing in dynamic environments remains challenging. Conventional gels are not ideal dressing materials for wound healing due to difficulties in completely sealing wounds and the inability to deliver drugs quickly and precisely to the injury. To tackle these issues, we propose a multifunctional silk gel that rapidly forms strong adhesions to tissue, has excellent mechanical properties, and delivers growth factors to the wound. Specifically, the presence of Ca 2+ in the silk protein leads to a solid adhesion to the wet tissue through a chelation reaction with water-trapping behavior; the integrated chitosan fabric and CaCO 3 particles ensure enhanced mechanical strength of the silk gel for better adhesion and robustness during wound repair; and the preloaded growth factor further promoted wound healing. The results showed the adhesion and tensile breaking strength were as high as 93.79 kPa and 47.20 kPa, respectively. MSCCA@CaCO 3 -aFGF could remedy the wound model in 13 days, with 99.41 % wound shrinkage without severe inflammatory responses. Due to strong adhesion properties and mechanical strength, MSCCA@CaCO 3 -aFGF can be a promising alternative to conventional sutures and tissue closure staples for wound closure and healing. Therefore, MSCCA@CaCO 3 -aFGF is expected to be a strong candidate for the next generation of adhesives.
研究领域:
生物医学工程
·
材料科学
·
组织工程
·
伤口愈合
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）