CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yunlei Zhao,Youyou Li,Bo Jin,Zhiwu Liang
As a powerful process intensification strategy, chemical looping shows a promising future to achieve an integrated CO 2 capture and utilization for reducing CO 2 emissions and energy-cost penalties. Herein, a bifunctional Ca-Fe-Mg material derived from layered double hydroxide (LDH) was synthesized and used in chemical looping reforming process for integrated CO 2 capture and utilization. Reactivity tests and detailed characterization techniques are performed to examine and explain the performance of this material. 900 °C is determined as a suitable reforming temperature, since more syngas production is obtained (2.5 times of at 800 °C). The presence of Ca induces a synergetic interaction between Ca and Fe to implement an enhanced performance of syngas contents and stable H 2 /CO ratio. The activity deactivation of the material derives from the phase transition of Ca 2 Fe 2 O 5 to MgFe 2 O 4 , crystal size variation and particle agglomeration. Compared to a reference coprecipitated material, LDH derived Ca-Fe-Mg material shows an enhanced syngas production, due to its highly dispersion of CO 2 sorption and reforming active sites. This work provides a new route to rationally design bifunctional material for integrated CO 2 capture and utilization.
研究领域:
环境科学
·
材料科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2026
·Vol. 61
·期 35
·26114-26129
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IF 4.4
Fan Yan,Sun Xueqin,Bi Tao,Hou Bo,Lu Fang
The accumulation of tetracycline antibiotics in water environments can lead to the emergence of antibiotic-resistant bacteria and resistance genes, posing a potential threat to ecosystems and human health. Therefore, the development of cost-effective and efficient methods for the remediation of antibiotic wastewater has become a current research hotspot. In this study, a novel photocatalyst, UiO-66-CA-Cu (CA was the abbreviation for “citric acid”), was prepared by two-step functionalization modification of the MOF material (University of Oslo-66, abbreviated as UiO-66). Under irradiation of simulated sunlight, UiO-66-CA-Cu-led photocatalysis and peroxymonosulfate (PMS) activation co-degradation system achieved 93.3% ( k = 0.04712 min −1 ) removal efficiency of tetracycline hydrochloride (20 mg/L, 50 mL) within 60 min. The functional modification was used to optimize the local environment of the parent MOF. The asymmetry of the Zr–O cluster structure introduced by CA could effectively improve the separation efficiency of photogenerated carrier in the material, and the introduced Cu 2+ ions could be used as the activation site to further enhance the material’s activation ability to PMS. Graphical In this work, a novel photocatalyst, UiO-66-CA-Cu (CA was the abbreviation for “citric acid”), was prepared by two-step functionalization modification of the MOF material (UiO-66). Under simulated sunlight irradiation, the degradation system constructed by the photocatalyst UiO-66-CA-Cu coupled with peroxymonosulfate (PMS) activation could achieve efficient removal of tetracycline hydrochloride (removal efficiency: 93.3%, k = 0.04712 min -1 ). In addition, we systematically investigated the effects of PMS concentration, photocatalyst concentration and initial pH value on the degradation performance over this system, and further proposed the possible degradation mechanism.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Jialin Wang,Jie Ren,Miao Chen,Jianxin Chen,Panpan Zhang,Mengmeng Sun,Yingying Zhao,Jingtao Bi
The mechanisms and predictive models for the effects of ionic strength and temperature on adsorption capacity remain insufficiently understood. In this work, Ca(II) adsorption removal in potassium-enriched brines from seawater potash production is used as a representative system. From a statistical-physics perspective, higher ionic strength reduced the density of adsorption sites and the number of adsorbates captured per site, and the preferred adsorption orientation changed from perpendicular to parallel, resulting in a lower adsorption capacity and reduced spontaneity. In contrast, higher temperature increased the density of adsorption sites and the number of adsorbates captured per site, and the preferred orientation changed from parallel to perpendicular, yielding a higher adsorption capacity and greater spontaneity. Finally, predictive models of adsorption capacity as functions of ionic strength and temperature were established to support the optimization of related industrial processes.
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高影响因子
Microstructures
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2026
·Vol. 6
·期 2
·N
·
IF 8.5
Zichen He\u003Csup\u003E1,\u003C\u002Fsup\u003E,Xingyu Chen\u003Csup\u003E1,2,\u003C\u002Fsup\u003E,Faqiang Zhang\u003Csup\u003E1\u003C\u002Fsup\u003E,Zhengqian Fu\u003Csup\u003E1\u003C\u002Fsup\u003E,Xiangyu Meng\u003Csup\u003E3\u003C\u002Fsup\u003E,Dongxiao Fan\u003Csup\u003E4\u003C\u002Fsup\u003E,Jiawei Zhang\u003Csup\u003E1\u003C\u002Fsup\u003E,Mingsheng Ma\u003Csup\u003E1\u003C\u002Fsup\u003E,Yongxiang Li\u003Csup\u003E5\u003C\u002Fsup\u003E,Zhifu Liu\u003Csup\u003E1\u003C\u002Fsup\u003E
With the ongoing miniaturization of multilayer ceramic capacitors (MLCCs), there is an increasing demand for dielectric materials that simultaneously exhibit high dielectric constant, excellent DC-bias stability, and high reliability. To address this challenge, B-site Ca doping was employed to regulate the polar structure of BaTiO3-based ceramics. In this study, we systematically investigated the effects of Ca doping on the crystal structure, defects, and microstructure by varying the dopant concentration and occupancy behavior. The B-site Ca-doped BaTiO3 ceramics exhibit a pseudo-cubic structure, characterized by the coexistence of tetragonal and cubic phases. Ca2+ substitution for Ti4+ disrupts the long-range ferroelectric order, leading to the formation of polar nanoregions (PNRs) interconnected and embedded within a non-polar matrix. Defect analysis and studies on reducing atmosphere sintering reveal that oxygen vacancies are effectively localized by cation defects, thereby suppressing long-range conduction. These structural features synergistically result in a high dielectric constant, superior DC-bias stability, enhanced insulation resistance, and strong non-reducibility. This work provides fundamental insights into the microstructural design of BaTiO3-based ceramics and highlights their potential for high-reliability MLCC applications.
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高影响因子
Journal of Sustainable Metallurgy
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2026
·
IF 3.5
Zhu Linchao,Ge Yuanyang,Wang Lin,Yuan Peiqing,Xu Xinru,Yang Jingyi
The leaching behavior of metallic elements in steel slag during acetic acid treatment is critical for its application in carbon sequestration. X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) characterized the content and morphology of major elements (Ca, Mg, Fe) in steel slag. The acid leaching kinetics of 3.2–5.0 mm steel slag in acetic acid was investigated via the fractal shrinking core model, where the introduction of fractal dimension improved the accuracy of describing leaching kinetics for large particles. Results showed that Ca 2+ and Mg 2+ leaching was dominated by ash-layer diffusion, while Fe 3+ leaching was controlled by surface reactions. Based on the surface zeta potential of steel slag, benzyltrimethylammonium chloride (TMBAC) was used to neutralize the anion shield layer, reducing ash-layer diffusion resistance and enhancing Ca 2+ and Mg 2+ leaching rates. Optimization of reaction parameters yielded a maximum Ca 2+ leaching rate of 61.51%. This study provides a basis for enhanced approaches to utilizing steel slag in processes requiring metal extraction, such as carbon sequestration. Graphical
The alternative text for this image may have been generated using AI.
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高影响因子
CERAMICS INTERNATIONAL
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2025
·
IF 5.6
Weichen Xu,Xiaomeng Li,Hong Wang,Fuliang Wang,Shouqiang Han,Jing Guo
Microwave dielectric ceramics are critical components in wireless communications. However, it is still a challenge to develop microwave dielectric ceramics with reduced sintering temperatures, high thermal stabilities and good dielectric properties at the same time. Herein, the entropy value, which is able to modulate the grain boundary energy and adjust the inherent sintering temperature, is engineered to develop high-performance microwave dielectric ceramics with low sintering temperatures. The structure-property relationships of AWO 4 ceramics, including (NaCaBi) 1/3 WO 4 , (NaCaSrBi) 1/4 WO 4 , (NaLiCaBiSm) 1/5 WO 4 and (NaLiCaSrBiSm) 1/6 WO 4 with increased entropy values are investigated systematically. X-ray diffraction and high-resolution TEM analyses confirm the formation of single-phase solid solutions with the tetragonal scheelite structure in AWO 4 ceramics. As the number of elements in the A-site varies, the relative permittivities, Q × f values and TCF values shift in the range of 12.2–16.5, 8,000–25,000 GHz and −32.3–31.6 ppm/°C, respectively. Simultaneously, the high-entropy samples demonstrate the lowest sintering temperature of 750 °C among the four formulations. Phillips-Van Vechten-Levine (PVL) complex chemical bond theory reveals that the covalency, lattice energy and bond energy affect the relative permittivity, Q × f value and TCF value, respectively. Raman spectra suggest that high entropy value leads to increased disorder, and infrared reflectivity spectra illustrate that the dielectric response is dominated by polarized optical phonons of [WO 4 ] tetrahedron. It is anticipated that entropy design will facilitate the development of microwave dielectric ceramics in low temperature co-fired ceramic applications.
研究领域:
材料科学
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陶瓷
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介电材料
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电子材料
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固态化学
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Hua Yu,Bingxue Yao,Degang Deng,Leifeng Chen,Hongting Zhao,Yinqun Li,Youjie Hua,Shiqing Xu
A novel tunable red to yellow emitting phosphor, (Ca, Ba) 4 (PO 4 ) 2 O:Eu 2+ is reported that displays a broad emission from 500 to 800 nm, and its emitting color can be adjusted from red to yellow by changing Ba 2+ doping concentration. X-ray powder diffraction (XRD) analysis confirmed the phase formation. Excitation and emission spectra, and concentration dependence of emission intensity of the phosphor were investigated. The results showed that the emission peak wavelength take blue-shifted from 640 to 545 nm and the color hue can be tuned from red to yellow with increasing Ba 2+ concentration. When single-phase (Ca 3.85 Ba 0.10 )(PO 4 ) 2 O:0.05Eu 2+ phosphor is pumped by a blue InGaN light-emitting diode, we obtain white light with color rending index ( R a ) between 84.0 and 90.6 and color temperatures between 4000 and 5500 K, which suggests that this material is competitive as a color conversion material for solid state lighting.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
INORGANIC CHEMISTRY
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2018
·
IF 4.7
Lizhu He,Zhen Song,Xionghui Jia,Zhiguo Xia,Quanlin Liu
T-phase (Ba,Ca)2SiO4:Eu2+, showing excellent luminescent thermal stability, has a positionally disordered structure with the splitting of five atom sites, but until now the reason has remained unclear. Herein, we investigate the coordination environments of each cation site in detail to understand the origins of the atom site splitting. We find that the three cation sites in the split-atom-site model are optimally bonded with ligand O atoms compared to the unsplit-atom-site model. This atom site splitting results in larger room and smaller room for each splitting cation site, which just accommodates larger Ba2+ ions and smaller Ca2+ ions, respectively, leading to more rigid structure. Based on the X-ray diffraction data refinement, the boundary of the T-phase for (Ba1–xCax)2SiO4 is redetermined. The Eu2+-doped T-phase (Ba,Ca)2SiO4 phosphors show excellent luminescent thermal stability, which can be attributed to optimal bonding and more rigid structure with atom site splitting. These results indicate that T-phase (Ba,Ca)2SiO4:Eu2+ phosphors have promise for practical applications.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Chen Zhou,Hui Zhang,Jianian Cheng,Hongyi Li,Sadeh Beysen
Two new isostructural lead borates , Pb 8 Mg(BO 3 ) 6 and Pb 8 Ca(BO 3 ) 6 , have been synthesized via high temperature solution method. The single crystal structures of title compounds contain ∞ [Pb 8 B 6 O 18 ] 2- double layers composed of planar BO 3 triangles, Pb(2)O 9 and distorted Pb(1)O 5 polyhedra, these layers condense in c -axis, and the MgO 6 (or CaO 6 ) polyhedra fill into the layers, forming a three-dimensional framework. The stereochemical activity of lone pair (SCALP) electrons were found in the Pb(1)O 5 polyhedra, which combine with the BO 3 units, generating strong optical anisotropy . The calculated birefringences of Pb 8 Mg(BO 3 ) 6 and Pb 8 Ca(BO 3 ) 6 using first-principles method are 0.15@1064 nm and 0.12@1064 nm, respectively, which are comparable to the commercial α -BaB 2 O 4 (α-BBO) crystal and imply that they probably can be used as birefringent materials. The electronic structures, density of states of title compounds were calculated by density functional theory (DFT). Meanwhile, the TG-DSC curves, infrared spectral and UV–Vis–NIR diffuse reflectance spectral were measured.
研究领域:
无机化学
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材料科学
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晶体工程
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非线性光学材料
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固体化学
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DOI
高影响因子
ACS Applied Energy Materials
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2022
·
IF 6.959
Qin Cao,Ruiming Qiu,Libin Lei,Wenda Zhang,Sihao Deng,Jie Chen,Lunhua He,Jungu Xu
Tetragonal La2BaIn2O7 belongs to the stoichiometric n = 2 members of the Ruddlesden–Popper (RP) structure, with La3+ and Ba2+ cations ordered in the rock salt and octahedral layers, respectively. Herein, a series of alkaline-earth-metal-doped materials La2–xMxBaIn2O7–0.5x (M = Ca, Sr, Ba) were prepared by the traditional solid-state reaction method. The results revealed that the substitutions of Ca/Sr/Ba for La introduced oxygen vacancies and led to good oxide ion conduction, e.g., ∼1.21 × 10–3–1.38 × 10–2 S/cm within 600–900 °C for the specimen La1.7Ba1.3In2O6.85, which was more than 2 orders of magnitude higher than the parent material. However, both the parent and acceptor-doped La2BaIn2O7 showed very limited proton conductions. The energetics of defect formation and oxygen vacancy migrations in La2BaIn2O7-based materials was studied through the static lattice and molecular dynamics (MD) atomistic simulations based on the interatomic potential approach. The defect formation energy calculations for the electrons and holes in La2BaIn2O7 rationalized the experimentally observed pure ionic conduction under low pO2 and mixed ionic and p-type electronic conductions under high pO2, respectively. The MD simulations indicated two-dimensional oxygen vacancy migration within the perovskite slab for the acceptor-doped La2BaIn2O7.
研究领域:
材料科学
·
固体离子学
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计算材料物理
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陶瓷材料
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能源材料
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Mingsheng Cai,Tianchun Lang,Shuangqiang Fang,Tao Han,Damir Valiev,Houjiang You,Chong Liu,Jing Yu,Peng Su,Xiaolong Jing,Guanghui Ge,Bitao Liu,Elena F. Polisadova
Fluorescent materials are widely used for anti-counterfeiting of information security and commodities. However, the increasing requirements for fluorescent anti-counterfeiting technology urgently require the development of novel fluorescent materials with multicolor fluorescence, single component, and excellent stability. Herein, a color tunable Ba 0·94 Ca 0.06 ScO 2 F: Eu 2+ , Bi 3+ , K + perovskite with dependence of excitation wavelength for high-level anti-counterfeiting is reported. The fluorescence spectra of Ba 0·94 Ca 0.06 ScO 2 F: Eu 2+ , Bi 3+ , K + perovskite show the tunable emission band with the peak between 479 and 509 nm. It is worth noting that the peak intensity ratio at 479 and 509 nm changes with the dependence of the excitation wavelength. Meanwhile, the snowflake pattern is designed to demonstrate the potential applications in anti-counterfeiting, which obviously shows four different color patterns under the sunlight, 320 360, and 415 nm excitation, respectively.
研究领域:
材料科学
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光学材料
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防伪技术
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发光学
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光子学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
·
IF 3.582
Lingwei Lu,Shuang Ni,Gang Liu,Xiaoxiang Xu
The crystal structure of a photocatalyst generally plays a pivotal role in its electronic structure and catalytic properties . In this work, we synthesized a series of La/Cr co-doped perovskite compounds ATiO 3 (M = Ca, Sr and Ba) via a hydrothermal method . Their optical properties and photocatalytic activities were systematically explored from the viewpoint of their dependence on structural variations, i.e. impact of bond length and bond angles. Our results show that although La/Cr co-doping helps to improve the visible light absorption and photocatalytic activity of these wide band gap semiconductors , their light absorbance and catalytic performance are strongly governed by the Ti O bond length and Ti O Ti bond angle. A long Ti O bond and deviation of Ti O Ti bond angle away from 180° deteriorate the visible light absorption and photocatalytic activity. The best photocatalytic activity belongs to Sr 0.9 La 0.1 Ti 0.9 Cr 0.1 O 3 with an average hydrogen production rate ∼2.88 μmol/h under visible light illumination (λ ≥ 400 nm), corresponding to apparent quantum efficiency ∼ 0.07%. This study highlights an effective way in tailoring the light absorption and photocatalytic properties of perovskite compounds by modifying cations in the A site.
研究领域:
材料科学
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物理化学
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能源化学
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无机化学
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光催化
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DOI
高影响因子
危险品化学品经营许可证（带存储）