ISIJ INTERNATIONAL
·
2024
·
IF 1.6
Zhongya Pang,Shun Chen,Zhenqiang Jiang,Chenyang Han,Xing Yu,Kai Zheng,Chaoyi Chen,Guangshi Li,Qian Xu,Xingli Zou,Xionggang Lu
Titanium-bearing blast furnace slag (TBFS), a byproduct of ironmaking processes, has long been discarded as waste, resulting in the squandering of valuable resources such as titanium. The recovery and effective utilization of TBFS hold immense significance and importance. This study reports a direct electrolysis method for synthesizing Ti5Si3 alloy from a TBFS/SiO2 mixture in molten CaCl2 at 950 °C. A comprehensive investigation was conducted into the phase and morphological evolution during the electrolysis process, along with an analysis of the migration behavior of impurities such as Ca and Al present in TBFS. The synthesized Ti5Si3 alloy powder was systematically characterized and analyzed using scanning electron microscopy, transmission electron microscopy, and other techniques. The results reveal that the electrolysis process encompasses electrochemical deoxidation, in-situ alloying, and self-purification. Furthermore, this study achieved further purification of the Ti5Si3 alloy through vacuum laser rapid melting, effectively volatilizing and removing the residual impurity elements, resulting in an increase in the purity of Ti5Si3 alloy from 96.8% to 98.6%. The resultant Ti5Si3 alloy exhibits excellent corrosion resistance in phosphate buffer solution. In summary, this work provides a crucial technical paradigm and scientific theoretical foundation for the resourceful and value-added utilization of ironmaking solid waste, specifically TBFS.
研究领域:
冶金学
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材料科学
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产品关联
DOI
高影响因子
Materials Research Express
·
2025
·
IF 2.2
Ziyi Liu,Juanjuan Xing,Shuanglong Yuan,Hua Tong
Barium titanate (BaTiO₃) nanoparticles were synthesized via a hydrothermal method using barium hydroxide (Ba(OH)₂) and titanium oxide (TiO₂) as starting materials. The present study investigates the influence of TiO₂ sources on BaTiO3 nanoparticle crystallinity and morphology. A comprehensive statistical analysis was conducted, revealing a direct correlation between the phase and size of the TiO₂ and the properties of the BaTiO₃. Anatase TiO₂, with a size ranging from 5-30 nm, was found to yield uniform spherical BaTiO₃ nanoparticles with sizes ranging from 66.1 ± 9.4 nm to 80.3 ± 10.8 nm. Conversely, rutile TiO₂, with a size of 10 nm, yielded irregular particles with an average size of 386.6 ± 146.99 nm. XRD analysis demonstrated that smaller anatase TiO₂ (5 nm) exhibited a propensity to favor cubic-phase BaTiO₃, while larger anatase TiO₂ (10–30 nm) exhibited a propensity to promote tetragonal-phase dominance. Conversely, rutile-derived BaTiO₃ exhibited a mixed phase (tetragonal-to-cubic ratio: 2:3). Kinetic studies of precursor synthesis have demonstrated that 5 nm anatase TiO₂ facilitates the rapid nucleation of BaTiO₃ within 30 seconds, reaching full conversion. This is in contrast to the slower kinetics caused by larger anatase TiO₂ and the negligible reactivity observed for rutile TiO₂. These findings underscore the critical role of TiO2 phase and size in tailoring BaTiO3 nanoparticles for advanced dielectric applications, enabling precise control over particle size (60–80 nm) and crystallinity through precursor engineering.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Jiaqiao Yuan,Xiang Gong,Hongyu Lu,Wei Jiang,Hao Lai,Shuming Wen,Shaojun Bai,Dandan Wu
To address the challenge of separating ilmenite from titanaugite, the feasibility of a novel collector (2-ethylhexyl) phosphonic acid mono-2-ethylhexyl ester (HEHEHP) was firstly investigated in this work. The flotation results indicated that HEHEHP possessed superior collecting performance over a broader pH range for ilmenite compared to benzohydroxamic acid and sodium oleate. Under conditions with a pH of 8.0±0.2, a high-quality concentrate with a TiO 2 grade of 40.74% and a recovery of 87.66% was achieved. Adsorption studies and AFM analysis implied that the adsorption density of HEHEHP on ilmenite was significantly higher than that on titanaugite. Zeta potential analysis implied that the negatively charged HEHEHP anion primarily acted on ilmenite through chemisorption. ToF-SIMS, XPS, and FTIR further corroborated that HEHEHP interacted with the Fe and Ti sites on the ilmenite surface primarily through the P=O and P-OH functional groups in the adsorption process, leading to the formation of PO-Fe or PO-Ti bonds, thereby chemically adsorbing onto the ilmenite. DFT calculations proved that the two O atoms in the PO(OH) group exhibited significant reactivity, serving as the main active sites during the adsorption of HEHEHP. In summary, the chemical interactions between the PO(OH) group in HEHEHP and the active Fe and Ti sites on the ilmenite surface are responsible for the primary mechanism for the selective adsorption of HEHEHP.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 11
·3292-3303
·
IF 5
Weina Song,Yamin Liu,Yongli Dong,Xue Han,Mei Mu,Yan Chen,Wenyan Wang,Pei Wang,Wei Li
A heterophase junction TiO2 catalyst with brookite and anatase (MT-200-BA) was prepared via a facile one-step solvothermal method, based on the initial construction of the MIL-125(Ti) metal organic framework (MOF) precursor and subsequent structure transformation from the MOF precursor to brookite@anatase heterojunction TiO2. The fabricated catalysts have been fully characterized by X-ray diffraction (XRD), N2 adsorption–desorption, thermogravimetry (TG), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and various spectral and electrochemical tests. It was found that the unique nanostructure with a high specific surface area and large pore diameter, particularly brookite@anatase heterophase junctions and a narrow band gap make the MT-200-BA catalyst exhibit a significantly enhanced solar-driven H2 generation rate under air mass 1.5 global (AM 1.5 G), which is significantly higher than those of MIL-125(Ti), MT-180-MA and commercial P25. In addition, the MT-200-BA catalyst has also shown excellent photocatalytic performance for the degradation of tetracycline hydrochloride (TCH). The synthesis strategy adopted in this paper paves a new way for the construction of novel photocatalysts with heterojunctions via phase transformation from MOFs.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Mengting Jiang,Xiaopeng Li,Tengfei Deng
In this study, aluminum titanate/anorthite (Al 2 TiO 5 -CaAl 2 Si 2 O 8 ) ceramics were fabricated from ferrotitanium slag through phase reconstruction. Stabilization of the ceramic was achieved by migration of Mg element into Al 2 TiO 5 phase. The results indicated that optimal performance was achieved with the addition of 4 wt% MgO and 60 wt% ferrotitanium slag at 1370°C. The ceramic exhibited bulk density of 3.11 ± 0.01 g/cm 3 , thermal storage density of 1.51 kJ/cm 3 , and thermal expansion coefficient of 3.40 × 10 −6 /°C (1000°C), respectively. Additionally, the solid solution of Mg 2+ in the Al 2 TiO 5 lattice reduced the formation of microcracks and enhanced the mass transfer process. Consequently, the sintering temperature decreased from 1415°C to 1370°C while the bending strength increased from 61.25 ± 1.05 MPa to 75.92 ± 7.72 MPa. Furthermore, finite element simulation demonstrated that higher thermal expansion led to concentrated thermal stress, potentially increasing the possibility of ceramic cracking. This research provides a new strategy for preparing low thermal expansion ceramics from titanium-containing solid waste.
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
VACUUM
·
2018
·
IF 2.067
Guobo Yang,Baoqiang Xu,Xianjun Lei,Heli Wan,Bin Yang,Dachun Liu,Zhijun Wang
A new process to fabricate porous titanium by calcium vapor in-situ reduction of titanium sespuioxide was presented in this paper. The mixture of Ti 2 O 3 and CaCl 2 powders was preformed and reduced by calcium vapor. The porous titanium structure was obtained after leaching reduction products with hydrochloric acid and deionized water. The pore structure , morphology, composition of reduction products were investigated by SEM-EDS and XRD . The influence of different contents of anhydrous calcium chloride on porosity was discussed. The results show metallic titanium products with two types of pore structures and vacuum sintering treatment strengthened effectively connection between titanium particles. The porosity of porous titanium samples was 62%–82% and more than 90% of pores are open-pores.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Guan Fu Liu,Pian Pian Ma,Yin Qiao,Ren Hao Xu,De Meng Huang,Rui Yang Hu,Li Yuan Liu,Guo Hua Jiang,Muslum Demir
Perovskites oxides have recently been widely deployed in supercapacitors though they are suffering from poor electrochemical activity as electrode materials. Herein, a series of Ti-substituted perovskite SrCo 1- x Ti x O 3-δ ( x = 0, 0.05, 0.10, 0.15, 0.20) are synthesized by solid-state reaction method for anion-intercalated supercapacitor electrode materials. The structural evolution, morphology and the electrochemical performance with the variation of Ti content are characterized in detail. The parent material SrCoO 3- δ contains two phase: a hexagonal structure with space group R 3 ¯ :H (87.09 wt%) and a simple cubic structure with space group Pm 3 ¯ m (12.91 wt%). While a stable cubic structure with Pm 3 ¯ m space group is obtained after Ti substitution and the electrochemical performance is also significantly optimized. A highest specific capacitance ( C s ) of 625.0 F g −1 at 1 A g −1 is achieved in SrCo 0.9 Ti 0.1 O 3-δ sample. The superior electrochemical performance of SrCo 0.9 Ti 0.1 O 3-δ is attributed to the stable cubic structure with higher conductivity and large amount of oxygen vacancy which directly contributes to the anion-intercalated energy storage. In addition, the asymmetric supercapacitor combined with activated carbon electrode exhibits a high specific capacitance of 114.4 F g −1 (50.8 mAh g −1 ) and 98.3 F g −1 (42.7 mAh g −1 ) at 5 mV s −1 and 1 A g −1 , respectively. The device presents an energy density of 69.9 Wh kg −1 at power density of 1600 W kg −1 with a working voltage of 1.6 V.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xin Zhang,Junyu Chen,Xiang Pei,Jian Wang,Qianbing Wan,Shaokang Jiang,Chao Huang,Xibo Pei
Nanoscale zeolitic imidazolate framework-8 (ZIF-8)-modified titanium (ZIF-8@AHT) can enhance osteogenesis in vitro. In this study, we systematically and quantitatively examined the effects of ZIF-8@AHT on osteogenesis, and investigated its ability to form bone in vivo. First, we coated various quantities of nanoscale ZIF-8 crystals on alkali- and heat-treated titanium (AHT) by controlling the concentration of the synthesis solution. We then characterized the ZIF-8@AHT materials using scanning electron microscopy (SEM), powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and determination of the sessile drop contact angle. To illustrate the combined effects of micro/nanotopography and ZIF-8@AHT composition on bone regeneration, we cultured MC3T3-E1 preosteoblast cells on various titanium substrates in vitro by setting pure titanium (Ti) and AHT as control groups. The ZIF-8@AHTs enhanced cell bioactivity compared with AHT and Ti, as evidenced by increased extracellular matrix (ECM) mineralization, collagen secretion and the upregulated expression of osteogenic genes (Alp, Col1, Opg, and Runx2) and osteogenesis-related proteins (ALP and OPG). ZIF-8@AHT-1/8 exhibited better osteogenic activity compared with the other ZIF-8@AHT groups investigated. We subsequently inserted Ti, AHT, and ZIF-8@AHT-1/8 implants into the healed first molars (M1s) of mice, and found that ZIF-8@AHT-1/8 also promoted osseointegration at the bone–implant interface. These results suggest that ZIF-8@AHT-1/8 has great potential for practical application in implant modification.
研究领域:
生物材料
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组织工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 6
·3905-3916
·
IF 3.502
Yongjie Liu,Yue Wang,Yu Zhang,Zhixiong You,Xuewei Lv
Ammonia gas can be simultaneously used as a reductant and nitrogen source to prepare TiN from titania. In this work, the mechanisms on reduction and nitridation of micrometer-sized anatase with ammonia gas have been investigated, using both thermodynamic and experimental studies. The thermodynamic analysis indicated that reduction and nitridation of TiO 2 by NH 3 was feasible. Anatase will undergo different paths to form TiN, depending on the reaction temperature. Upon heating, NH 3 was seen to partially decompose into N 2 and H 2 , although the actual NH 3 decomposition ratio was less than the theoretical value. The experimental results indicated that the obtained titanium nitride was non-stoichiometric (TiN x O 1 −x , x ≤ 1), as it contained a certain amount of oxygen. Based on the phase transformation and X-ray photoelectron spectroscopy analysis, the reduction and nitridation routes were deduced: TiO 2 reacted with NH 3 to form TiN x O 1− x directly, at lower temperatures, and followed the path TiO 2 → Ti n O 2n−1 → TiN x O 1− x , at higher temperatures. Ti n O 2n−1 was determined to be Ti 4 O 7 and Ti 3 O 5 at 1100°C and 1200°C, respectively. Reaction temperature and time significantly affected the oxygen and nitrogen contents in TiN x O 1− x , with the lattice parameter of roasted products gradually increasing—approaching those of pure TiN—with an increase in reaction temperature and holding time. At the same time, the content of oxygen in TiN x O 1− x decreased, and its nitrogen content correspondingly increased.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Handong Jiao,Mengjun Liu,Zhe Wang,Manpeng Lin,Zhaoliang Qu,Jianxun Song,Shuqiang Jiao
Molten salt electrorefining is expected to be a powerful technology for upcycling titanium scrap because of its robust ability of removing impurities. However, realizing the stable operation of electrorefining, for example, the current efficiency of the anode and the cathode is still a key challenge from the viewpoint of industrial applications. Here, we study titanium’s anodic dissolution and cathodic deposition processes via a direct three-dimensional visualization method based on a computed tomography technology under high-temperature operational conditions. Real-time quantitative results show that the current efficiency is obviously affected by the concentration of titanium ions in the melt. Visual analysis of the local dissolution rate and the curvature of the titanium anode at different electrolysis stages reveals the kinetic origin of the concentration-induced current efficiency changes, which arise from the priority of the side reactions being dependent on the concentration of titanium ions. Finally, we show that employing the high concentration and single existence forms of titanium ions is an effective strategy to prevent the side reactions and improve the current efficiency. This work provides a fresh and fundamental understanding of the side reactions occurring at the interface of electrodes and is significant for facilitating the stability of electrorefining engineering of titanium.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 38
·16963-16968
·
IF 7.76
Guoqiang Zhang,Wenshuai Jiang,Shixin Hua,Haifeng Zhao,Ligong Zhang,Zaicheng Sun
Defects (Ti3+ or oxygen vacancies) have been demonstrated to promote the charge separation process in TiO2 based photocatalysts. Particularly, the bulk defects within a certain concentration can give a great enhancement for both light absorption and charge separation efficiency. In this report, we explored a one-step molten salts route to synthesize SrTiO3 nanocubes with bulk defects (Ti3+ doped) by using SrCO3 as a Sr source, and TiO2 and Ti powder as Ti sources. The amount of defects can be tuned by changing the molar ratio of Ti/TiO2. The corresponding bandgap of SrTiO3 can be changed from 3.29 to 2.73 eV with the increase of defects. X-ray diffraction and electron microscopy disclose that SrTiO3 is highly crystalline and has a cubic morphology. X-ray photoelectron spectroscopy and electron paramagnetic resonance indicate that the as-prepared SrTiO3 is close to the Ti3+ doped SrTiO3. Surface photovoltage spectroscopy (SPS) and field-induced SPS confirm that Ti3+ doping in the SrTiO3 turns it from an n-type semiconductor to p-type. The SrTiO3 with an optimal amount of defects exhibits highly enhanced photocatalytic performance. An excess amount of defects results in a weak SPS response and photocatalytic performance.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liqi Zhang,Xu Zhang,Bowen Huang,Yusheng Yang,Zengwu Zhao
Titanium is an excellent structural and functional material . At present, the production of titanium has long process cycle, high energy consumption, serious pollution and other characteristics, so the development of low-cost titanium production methods has extremely far-reaching significance. In this work, the electrochemical reduction process of Ti(IV) and Ti(II) in the CaF 2 -CaO melt were investigated by cyclic voltammetry and square wave voltammetry measurements at 1740 K, respectively. In the CaF 2 -CaO-5 wt% TiO 2 melt, Ti(IV) ions were reduced to Ti by one step. One measure was taken to lower the valence state of Ti ions : Ti(IV) ions in the melt was changed to Ti(II) by adding Ti 0 . Ti(IV) ions were reduced in two steps: in the CaF 2 -CaO-5 wt% TiO 2 -Ti 0 melt, Ti(IV) → Ti(II) and Ti(II) → Ti, respectively, and in the CaF 2 -CaO-5 wt% TiO, the Ti(II) ions were reduced in a single step: Ti(II) → Ti. It was found that both migration and mass transfer affected the reduction processes. In contrast to the Ti(IV) reduction to Ti process, the Ti(II) reduction to Ti process showed a higher diffusion rate. Electrolytes and electrodes were analyzed after titanium electrodeposition by XRD . It was found that there were no metal titanium was detected in the electrolyte placed close to the cathode after electrodeposition . It believed that the formed metallic Ti reacted with dissolved O 2- in the melt to form TiO. The reduction process of Ti(IV) on the iron electrode was investigated, the metal Ti was reduced by alloying process, the oxidation of Ti was hindered, there was a dense structure layer of CaTiO 3 outside the reduced metal Ti that prevented the ions transfer and affected the Ti(IV) ions migration process, which might be the main factor that the Ti(IV) reduction process was controlled by migration. The lower valence state of Ti in the melt promoted the formation of Ca 2 TiO 4 , which increased the ion migration rate and decreased the mass transfer rate. It was suggested that titanium or titanium alloys may be prepared by reducing the valence of Ti(IV) in minerals and altering the melt composition. It is feasible to prepare titanium and titanium alloys by MOE short process using ore as raw material.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）