Journal of Sustainable Metallurgy
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2023
·Vol. 9
·期 3
·1303-1314
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IF 2.4
Lv Ningning,Qiu Yuchao,Hu Yiming,Shi Hangkai,Shi Junjie,Ding Xiang,Li Haolun
It has been proved that Cr 2 O 3 is favorable to promote the crystallization of perovskite in the Selective Crystallization and Phase Separation (SCPS) process. However, the related thermodynamic data of equilibrium phase relations was quite limited. In the present work, the equilibrium phase relations of CaO-SiO 2 -TiO 2 system with the addition of 5 wt% Cr 2 O 3 were experimentally carried out using the high temperature equilibration-quenching technique followed by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM–EDS), as well as thermodynamic calculation. More attention has been focused on the influence of 5 wt% Cr 2 O 3 addition on the liquid-perovskite two-phase coexisting region. The results indicated that the crystallization of perovskite was promoted by Cr 2 O 3 addition by expanding the primary phase of perovskite toward higher SiO 2 areas. Meanwhile, distinct discrepancies were found when the present experimental results were compared with the data from the literature and the isotherms calculated by FactSage, indicating that the present results are not only meaningful for the improvement of the SCPS process, but also important for the optimization of titania related oxide thermodynamic database. Graphical Abstract
研究领域:
冶金学
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材料科学
✓ 已验证
DOI
高影响因子
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
·
2026
·
IF 2.2
Junjie Shi,Tongzhi Liu,Yandong Li,Yumo Zhai,Bin Yu,Jianbo Zhang,Min Chen,Jing Xu,Jingxiong Gao,Shuyi Wu,Ning Wang,Yun Huang,Jianzhong Li
Phase equilibria in the CaO-SiO 2 -TiO 2 system with 5-10 wt% Fe 2 O 3 addition were experimentally determined at 1300 °C in air. • Isothermal sections of the pseudo-quaternary system were constructed, supplying key experimental data for thermodynamic database optimization. • Fe 2 O 3 addition alters the liquid-CaTiO 3 phase equilibrium relationship and affects the distribution of Ti-bearing primary phase fields. • Experimental phase equilibrium data provide valuable information for thermodynamic database optimization. • The results provide a thermodynamic basis for optimizing Fe 2 O 3 addition in the selective crystallization of Ti-bearing blast furnace slag. Optimizing the Selective Crystallization and Phase Separation (SCPS) process is essential for improving the resource utilization of titanium-bearing blast furnace slag. However, the influence of Fe 2 O 3 addition on the phase equilibria of the CaO-SiO 2 -TiO 2 system remains insufficiently understood, particularly in Fe 2 O 3 -containing titanium-bearing slag systems. In this work, phase equilibria in the CaO-SiO 2 -TiO 2 system with 5 and 10 wt% Fe 2 O 3 additions were systematically investigated at 1300 °C in air using high-temperature equilibrium-quenching experiments, followed by characterization with XRD, SEM-EDS, and EPMA, along with thermodynamic calculations. Special attention was given to the influence of Fe 2 O 3 on the liquid-phase region and the liquid-CaTiO 3 two-phase coexistence region. The results show that the liquid region expands with increasing Fe 2 O 3 content, confirming its strong fluxing effect through stabilization of the liquid slag phase. Moreover, Fe 2 O 3 addition alters the liquid-CaTiO 3 phase equilibrium relationship and affects the distribution of Ti-bearing primary phase fields. Significant discrepancies were observed between the experimentally determined liquid-phase boundaries and FactSage predictions, with FactSage predicting a smaller liquid-phase region than that determined experimentally. The phase equilibrium data obtained in this study provide essential experimental information for thermodynamic model refinement of Fe 2 O 3 -containing CaO-SiO 2 -TiO 2 systems and offer theoretical guidance for optimizing the SCPS process and titanium-rich slag utilization.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 91
·期 3
·431-440
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IF 1.986
Zhang Cui,Shi Yan,Fu Zhifeng
We present an effective and environmental-friendly pathway to prepare SiO 2 hollow particles using Na 2 SO 4 particles as templates, which involved sol-gel silica coating on surface of the templates and subsequent removal of the Na 2 SO 4 templates by water-dissolution. Further, SiO 2 /TiO 2 double-shell hollow particles were prepared by coating TiO 2 on the surface of the hollow SiO 2 particles. The morphologies and structures of the synthesized hollow particles were characterized using SEM, TEM, XRD, FTIR, BET, and UV. The sizes and shapes of the hollow particles can be controlled by using Na 2 SO 4 templates with different sizes and shapes. The sizes of hollow particles were in the range from 500 nm to 15 μm. By changing the concentration of silicon precursor, the shell thickness of hollow SiO 2 particles can be controlled in the range of 25–200 nm. In addition, SiO 2 /TiO 2 double-shell hollow particles showed better photocatalytic degradation of Rhodamine B than that of hollow TiO 2 particles and solid TiO 2 particles.
In this study, we have successfully fabricated hollow SiO 2 particles with different shapes and size, as well as hollow SiO 2 /TiO 2 double-shell particles via a facile and environmentally friendly method employing water-soluble inorganic Na 2 SO 4 particles as template. The preparation process involved sol-gel silica and titania coating on surface of the template and followed by water-dissolution removal of the Na 2 SO 4 template.
研究领域:
材料科学
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纳米技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2019
·Vol. 6
·期 18
·1900943
·
IF 15.804
Pan Xue,Chuang Sun,Hongpeng Li,Jiajie Liang,Chao Lai
Lithium (Li) metal anodes have garnered increasing interest in recent years as its high theoretical capacity and low electrochemical potential promises a myriad of opportunities for various applications. However, one critical issue to overcome is the inhomogeneous deposition of Li + during the plating and stripping process. This inhomogeneous deposition could result in uncontrollable dendrite growth, further leading to poor coulombic efficiency, shorter lifecycles, and safety concerns due to internal short circuit and thermal runaways. To address these issues, a 3D porous core–shell fiber scaffold is presented, comprising of well-dispersed SiO 2 , TiO 2 , and carbon, as superlithiophilic host materials for lithium anodes. The amorphous SiO 2 and TiO 2 allow for controllable nucleation and deposition of metal Li inside the porous core–shell fiber even at ultrahigh current densities of 10 mA cm −2 . In addition, the interconnected conductive fiber with high porosity enables good electrical conductivity with fast ion transport and excellent mechanical strength to withstand massive Li loading during repeated cycles of stripping and plating. As a result, excellent cycling performance and high rate capability are observed in both symmetric cells and full cells, highlighting the feasibility of the proposed Li anode composite.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 21
·期 12
·3683-3691
·
IF 2.316
Gan Tian,Zhao Aixia,Wang Zhikai,Liu Pan,Sun Junyong,Liu Yanming
The present work is focused on a typical core-shell-structured SiO 2 @TiO 2 -based imprinted polymer composite, employed as a molecular recognition and sensing interface in the construction of an innovative electrochemical sensor. Herein, the methacrylic acid and a bronchodilator drug, theophylline, were used as functional monomer and template, respectively. The SiO 2 @TiO 2 served as a potential signal transducer to shuttle electrons between the binding sites and the electrode. Such modification induced an electrocatalytic effect and thereby greatly improved the electrode kinetics. The analytical features of the developed theophylline sensor have been accessed, and the results have indicated that an increase of differential pulse voltammetric current as compared to the corresponding traditional imprinted polymer modified electrode. Moreover, the sensor has showed high sensitivity, wider linear range (0.01–40 μM), lower detection limit (1.2 nM), and satisfactory long-term stability, which was validated with the complex matrices of tea, human blood serum, and urine, without any matrix effect and cross-reactivity.
研究领域:
分析化学
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药物分析
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 9
·6489-6493
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IF 3.708
Xuanxuan Qiao,Yuxia Luo,Aihua Sun,Chongyang Wang,Jianfei Zhang,Chengyi Chu,Jianjun Guo,Gaojie Xu
Surface modified colloidal SiO2@TiO2 core–shell particles were chosen to study their responsive photonic properties and the effect of surface on structural colour under low electric field. The surface of SiO2@TiO2 core–shell particles was controllably coated by PDDA, PVA and SiO2. A corresponding colloidal suspension of the modified SiO2@TiO2 showed completely different reflection spectra. The dielectric spectrum was employed to explain the effect of surface properties on the assembly.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2024
·
IF 4.1
Wei Liu,Daoyin Liu,Zuyang Zhang,Zhenkun Sun
Fluidized bed atomic layer deposition is an efficient technique for particle coating with precise control over the film thickness and uniformity at the sub-nanoscale. In this study, a fluidized bed with a central tube is designed, where the central tube has two roles: improve fluidization and deliver precursors separately. The synthesis of core-shell structured SiO 2 /TiO 2 nanoparticle catalysts for photodegradation of tetracycline hydrochloride (TC) is carried out using TiCl 4 and H 2 O as precursors at 180 °C under atmospheric pressure. Under the combination of vibration and central tube, the segregation of agglomerate size along the bed height is weakened, and the prepared SiO 2 /TiO 2 nanoparticles show excellent photocatalytic degradation performance: the degradation efficiency on TC is 96% under 300 W xenon lamp irradiation for 60 min. The mechanism of enhanced photocatalytic activity is due to the Ti-O-Si bonds generated at the interface, which increase the ability to absorb sunlight and accelerate the separation of holes and electrons.
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
Desalination and Water Treatment
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2024
·
IF 1
Xu Zuo,Shiyang Zou,Junrong Wu,Bingquan Ding,Aijun Jiang
Herein, core–shell Ag@SiO 2 /TiO 2 nanocomposites were synthesized and applied to activate peroxydisulfate (PDS) for wastewater purification. The Ag core and Ag-doped TiO 2 shell were obtained by stober method and calcination method. The dispersion degree and size of Ag in TiO 2 would influence the oxygen vacancy. Ag enhanced the visible absorption of TiO 2 and activated PDS. Improved degradation performance was attributed to enhanced PDS activation by photogenerated e − , which separated h + and thus promoted methyl orange(MO) degradation. Reactive oxidative species were verified under dark and light conditions via quenching experiments and electron paramagnetic resonance tests, demonstrating SO 4 •– , h + , O 2 •– , and 1 O 2 were formed in light,whereasSO 4 •– , •OH, O 2 •– , and 1 O 2 were responsible for MO degradation under dark conditions. The Ag@SiO 2 /TiO 2 /PDS/light system showed selectivity for removal of cationic dyes (e.g., methylene blue and malachite green) through adsorption and photocatalysis, whereas anionic dyes (e.g., MO) were degraded by photocatalysis alone. Besides, we found excess adsorption of micropollutant onto catalyst may be adverse to the activation of PDS. Therefore, the adsorption of oxidant (such as PDS) onto the catalyst surface would be beneficial for catalytic activation and micropollutant degradation, especially onto active sites. This work aims to provide a new avenue for core-shell structure catalyst synthesis in wastewater purification.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Yoshiaki Nomura,Manabu Kiguchi,Zhongoing Liang,Mei Ma,Akira Fujishima,Nobuhiro Hanada
The triazine herbicides simetryn and prometryn may cause damage to nontarget crops due to persistent contamination of agricultural water. Photocatalysis is a promising technology for the degradation of agricultural pollutants. This study provides the first systematic integration of photocatalytic herbicide degradation with live plant bioassay validation using cost-effective Fe3O4/SiO2/TiO2 magnetic photocatalysts synthesized by a simple coprecipitation method suitable for large-scale production. The phytotoxicity of herbicide-containing water was evaluated using pak choi, a crop sensitive to triazines. Both herbicides were completely decomposed in water within 240 min after UV irradiation, and their phytotoxicity also disappeared. In the plant toxicity evaluation, prometryn exhibited temporary high toxicity exceeding that of the untreated 10 ppm solution during the photodegradation process. In previous photocatalyst studies, evaluations relied on either chemical analysis or biological tests. In this study, we developed a new rapid toxicity screening technique using plant seedlings and established a safety evaluation protocol integrating chemical analysis and plant toxicity tests. This method represents the first approach to comprehensively evaluate the safety of agricultural water.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xinna Gao,Xueyan Wang,Zheng Yang,Yuhua Shen,Anjian Xie
A novel multi-functional yolk-shell SiO 2 @TiO 2 /CDs(y-STCs) nanocomposite with interesting structure of SiO 2 cores, porous TiO 2 shell, and cavities was synthesized by using a simple method. The experimental results indicate that the yolk-shell structure and modification of carbon dots (CDs) play important roles in the enhancement of SERS signals and photocatalytic performance. The y-STCs nanocomposite used as the SERS substrate showed excellent efficiency and reproducibility for the detection of rhodamine 6G (R6G). The detection limit of R6G was shown to be as low as 6 × 10 −8 M. Furthermore, the fabricated y-STCs nanocomposite utilized as the photocatalytst for the degradation of dinitraphenols (DNP) can greatly shorten reaction time to 120 min compared with previous studies, and the DNP degradation rate could reach 96% under simulated sunlight irradiation. The y-STCs nanospheres also possessed excellent cycle stability for the photocatalytic degradation of DNP. Thus, the bi-functional y-STCs nanocomposite may have potential applications in the detection and photocatalytic degradation of organic pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Chen Li,Yan Xiong,Lei Zhao,Haiqin Wan,Jun Li,Shenwen Fang,Meng Wang,Ming Duan,Jintian Ren,Yi Xiao
Experiment evaluation and mechanism analysis of separation performance are crucial for oily wastewater treatment. In this work, a fluorinated superhydrophobic/superoleophilic (F-SHPB/SOPL) surface was fabricated on a steel mesh substrate by double depositions of SiO2–TiO2 nanoparticles for high-roughness improvement and composite modification of fluorine-alkyl groups for low-energy achievement. Measurements of SEM, XPS, FTIR, laser scanning confocal microscope (LSCM), and excitation–emission matrix (EEM) were carried out for surface property characterization. The oil–water separation performances at the prepared F-SHPB/SOPL surface were investigated from experimental and simulation aspects. Separation tests, flux tests, and anti-contamination tests were performed by experimental methods. The results indicated that the surface showed excellent separation efficiencies (>99.2%) for oil–water mixture and oil-in-water emulsion, high permeate flux (>3000 L·m–2·h–1) for organic oils, and perfect anti-pollution/self-cleaning capacity for liquid and solid contaminations. The interaction energies and interaction distances were measured by ab initio molecular dynamics simulation (AIMD) simulations. With lower interaction energy (Eoil = −456.52∼−1044.22 eV) than that of water molecules (Ewater = −172.73 eV) and shorter distance (Doil = 4.42∼5.13 Å) than that of water molecules (Dwater = 11.49 Å), oil molecules showed higher interaction stability than water molecules on the F-SHPB/SOPL surface. The calculation revealed the essence of the oil–water separation phenomenon. This work not only proposes the fabrication methodology of the SHPB/SOPL material but also elucidates the intermolecular interaction for oil–water separation. The results can provide a fundamental basis for separation operation and removal treatment in industrial and domestic applications.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Weihao Zhao,Jinxin Fan,Yuan Tian,Cheng Wang
Lithium metal batteries have become one of the most promising rechargeable batteries due to the ultrahigh theoretical specific capacity of the Li metal anode. However, the Li dendrite growth and volume change of the Li metal anode during repeated Li plating–stripping cycles restrict the practical viability. Herein, a unique lithiophilic gradient structure of uniformly incorporating Ag nanoparticles into a three-dimensional (3D) nanofiber framework with amorphous SiO2 and TiO2 hybrids was prepared by an electrospinning process and used as a multifunctional interlayer between the pristine separator and Li metal foil. The 3D framework not only possesses excellent flexibility but also alleviates volume changes, which can withstand massive Li loading and promote uniform Li+ distribution. In addition, the 3D lithiophilic gradient structure allows for regulable Li+ flux and suppresses Li dendrite growth. Impressively, the Li||Li symmetric batteries with Ag@SiO2–TiO2 interlayers exhibit a prolonged lifespan of 1500 h at 0.5 mA cm–2 for 0.5 mAh cm–2. The full cells coupled with the Ag@SiO2–TiO2 interlayer show a capacity retention rate of 94.6% after 1000 cycles and a high rate capability. This work provides promising guidance for the design of a gradient-distributed lithiophilic structure toward an ultrastable Li metal anode.
研究领域:
材料科学
·
能源存储
✓ 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）