APPLIED GEOCHEMISTRY
·
2026
·
IF 3.5
Chundan Gan,Chunlai Hong,Jin-yan Yang
Vanadium (V)-bearing tailings can act as long-term sources of mobile V, yet the roles of tailings-associated minerals and residual beneficiation reagents in regulating V (im)mobilization remain unclear. Here, binary reactions between dissolved V(V) and representative minerals of V–Ti magnetite tailings, alongside tailings suspensions amended with oxalic acid or carboxymethyl cellulose (CMC), were used to isolate mineral- and reagent-specific controls on V transformation. Poorly crystalline Fe oxides, particularly ferrihydrite and lepidocrocite, showed the strongest V immobilization, decreasing dissolved total V from 25.5 mg/L to 6.16–10.5 and 6.21–8.41 mg/L, respectively. FTIR evidence for Fe–O–V surface complexation on ferrihydrite, together with limited structural changes in crystalline Fe and Fe–Ti phases, indicated that reactive surface sites rather than bulk mineral transformation dominated V immobilization. Birnessite retained V under oxidizing conditions while maintaining the aqueous V pool as V(V), whereas FeS induced reducing conditions and promoted the formation of dissolved non-V(V) species. In whole-tailings systems, oxalic acid mobilized V from the tailings, yielding 26.4 mg/L dissolved total V, and facilitated Fe(III)-to-Fe(II) transformation, with Fe(II) accounting for 95.0% of dissolved Fe by day 30 of incubation. However, XRD and FTIR showed no detectable transformation of the bulk tailings assemblage, indicating selective dissolution and redox transformation of reactive minor or poorly crystalline phases. In contrast, CMC had limited effects on V release. These findings show that reactive minor phases and residual oxalate can strongly influence V (im)mobilization, highlighting the need to incorporate reagent residues and Fe/S redox processes into risk assessments of V–Ti magnetite tailings.
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 6
·1441-1450
·
IF 7.2
Chen Xunlei,Chen Lin,Tian Jiang,Xu Cheng,Liao Jiaxin,Li Tianyu,Wang Jiankun,Feng Jing
Thermal and mechanical properties of yttrium tantalate (YTaO 4 ), a top coat ceramic of thermal barrier coatings (TBCs) for aeroengines, are enhanced by synthesizing Y 1− x Ta 1− x M 2 x O 4 (M = Ti, Zr, Hf; x = 0.06, 0.12, 0.18, 0.24) medium-entropy ceramics (MECs) using a two-step sintering method. In addition, the thermal conductivity, thermal expansion coefficients (TECs), and fracture toughness of MECs were investigated. An X-ray diffraction study revealed that the Y 1− x Ta 1− x M 2 x O 4 MECs were monoclinic, and the Ti, Zr, and Hf doping elements replaced Y and Ta. The variations in atomic weights and ionic radii led to disturbed atomic arrangements and severe lattice distortions, resulting in improving the phonon scattering and reduced thermal conductivity, with Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) exhibiting the lowest thermal conductivity of 1.23 W·m −1 ·K −1 at 900°C. The introduction of MO 2 increased the configurational entropy and weakened the ionic bonding energy, obtaining high TECs (10.4 × 10 −6 K −1 at 1400°C). The reduction in the monoclinic angle β lowered the ferroelastic domain inversion energy barrier. Moreover, microcracks and crack extension toughening endowed Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) with the highest fracture toughness of (4.1 ± 0.5) MPa·m 1/2 . The simultaneous improvement of the thermal and mechanical properties of the MO 2 (M = Ti, Zr, Hf) co-doped YTaO 4 MECs can be extended to other materials.
研究领域:
材料科学
·
机械工程
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Longjiao Lv,Huihao Luo,Guocheng Zhu
Metal-phenolic networks, despite their good ammonia nitrogen adsorption properties, have suffered from poor acid resistance and high oxidability in the past thus leading to ineffective treatment and the possible conversion of ammonia nitrogen into nitrate nitrogen. Research on the adsorption of ammonia nitrogen by titanium tannate (Ti-TA), which exhibits good resistance to ammonia nitrogen oxidation, is still unclear. A batch experiment was conducted to investigate the structural characteristics of Ti-TA, as well as its adsorption behaviors. Among them, advanced technologies such as Scanning Electron Microscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller, X-ray diffraction, and X-ray photoelectron spectroscopy, were used for this investigation. The results showed that Ti-TA, prepared with a molar ratio of tannic acid to tetrabutyl titanate of 1:5 at a solution pH of 7, was able to form a rough surface and a microporous structure with a specific surface area up to 356.9 m 2 /g. The parameters, affecting the adsorption results, included pH and adsorbent dose, where lower adsorbent doses resulted in higher adsorption capacities, reaching up to 4.175 mg/g, and neutral to weakly acidic conditions were conducive to the adsorption process. For example, when the initial NH 4 + -N concentration was 28.45 mg/L, and the ratio of tannic acid to Ti was 1.5, the removal rate of ammonia nitrogen can exceed 95.78 % within a pH range of 6–7. The primary mechanisms underlying physicochemical adsorption involve electrostatic interaction between oxygen ions and NH 4 + -N, as well as hydrogen bonding. The adsorption process occurred spontaneously, following Pseudo-second-order kinetics and adhering to the Freundlich isotherm model, with a relatively low adsorption index (1/ n < 0.5). For the first time, the findings of this study reveal the adsorption behaviors of Ti-TA and propose optimal preparation conditions, underscoring its significant potential for applications in nitrogen pollution treatment.
研究领域:
环境科学
·
材料科学
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Pengcheng Yin,Yucheng Yang,Shu Zhang,Zhao Hu,Dawei Li,Feihu Li
The potential of capacitive deionization (CDI) for sustainable desalination depends critically on breakthroughs in electrode materials. Defect-rich titanium (sub) oxides (anatase TiO₂(A), Ti₂O₃, Ti₃O₅, Ti₄O₇) offer compelling advantages, including tunable capacity, low environmental impact, and robustness. This study provides a systematic comparison of their structural features, electrochemical responses, and desalination efficacy. Electrochemical characterization results show anatase TiO₂(A) leads in specific capacitance (252.5 F g −1 at 0.3 A g −1 ), while Ti₃O₅’s highest oxygen vacancy minimizes charge transfer resistance and maximizes ion migration rates. In desalination trials, TiO₂ delivers a maximum salt adsorption capacity of 37.1 mg g −1 (500 mg L −1 NaCl, 1.2 V). All electrodes exhibit outstanding cycling stability (capacity retentions >83.5 %), affirming their practical potential. Correlation analysis discloses the oxygen vacancy-driven charge transfer mechanism inside these electrodes and establishes a structure-performance relationship. Overall, this work establishes fundamental structure-property relationships that underpin future electrode innovation via the oxygen vacancy-engineering strategy, which represents a promising pathway for advancing CDI performance boundaries.
研究领域:
材料科学
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环境工程
·
电化学
·
水脱盐
·
能量存储
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Wenping Cao,Jiabin Tu,Nuo Xu,Zhuang Wang,Xinyan Xiong,Qianru Lin,Jiazhi Wang,Nan Zhang,Jie Sheng,W.L. Li
Optimizing energy storage performance often involves increasing the discrepancy between maximum polarization and remanent polarization ( P max - P r ) and breakdown strength ( E b ). Here, aging treatment in acceptor doped NBT-based film is taken for increasing both E b and P max - P r by constructing ordered defect dipoles. Enhanced P max - P r value of 80.6 μC/cm 2 and high E b of 2630 kV/cm are obtained in the aged (Na 0.5 Bi 0.5 ) 0.55 Sr 0.45 Ti 0.99 Mn 0.01 O 3 thin film, which can be attributed to the reversible domain switching caused by ordered defect dipoles and low oxygen vacancies concentration. Accordingly, an energy density of 72.4 J/cm 3 with an efficiency of 76.8 % was achieved simultaneously in the aged film, which are approximately raised by 80.6 % and 45.2 %, respectively, compared with the unaged state. The stable energy storage performances are achieved within the scope of operating temperatures (20–200 ◦ C) and frequencies (0.2–10 kHz). These results provide a new route to take usages of aging process for optimizing the energy performance of NBT-based thin films.
研究领域:
材料科学
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凝聚态物理
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应用物理
·
纳米技术
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lei Tan,Qifeng Wu,Zengsheng Liu,Qiheng Chen,Hongling Yi,Zixiang Zhao,Liubin Song,Shengkui Zhong,Xianwen Wu,Lingjun Li
O3-type layered transition metal oxides (Na x TMO 2 ) have attracted extensive attention as a promising cathode material for sodium-ion batteries because of their high capacity. However, the irreversible phase transition especially cycled under high voltage remains a concerning challenge for Na x TMO 2 . Herein, a Ti-substituted NaNi 0.5 Co 0.2 Mn 0.3 O 2 cathode with strongly suppressed phase transition and enhanced storage stability is investigated. The Ti substitution effectively inhibits the irreversible phase transition and alleviates the structural change even charged to 4.3 V during the repeated Na + deintercalation process. After storing in air or water, the original O3 phase structure of the material is integrally maintained without the generation of impurity phase. As a result, the as-prepared material shows excellent long-term cycle stability and rate performance when charged to a high voltage of 4.3 V.
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CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 5
·6676-6682
·
IF 2.605
Pei Peng,Ya-Ya Hu,Yong Liu,Shi Chen,Jing Shi,Rui Xiong,Yue Zhang
Magnetoelectric (ME) ceramic composites of CoFe 2 O 4 (CFO) and Pb(Zr,Ti)O 3 (PZT) with varied composition ratios were sintered using a spark plasma sintering (SPS) method. The characterization of the ceramic compositions and morphologies revealed an even distribution of the CFO and PZT phases. Physical property measurements showed that when the CFO mass percent increased from 8% to 15%, the piezoelectric constant and dielectric constant decreased monotonously, while the saturation magnetization and dielectric loss were enhanced. It was determined that a CFO mass percent of 10% or less resulted in a significant change of the polarization behaviour and a clear enhancement of the ME conversion voltage coefficient ( α E ) with an applied magnetic field . In contrast, CFO mass percentages greater than 10% had a reduced α E , and their polarization behaviour was not influenced by an applied magnetic field. With an increasing proportion of CFO in the composite, the α E first increased and then decreased. The maximum value of the α E indicated an optimal proportion of CFO (10%), which is attributed to a competition between the improved magnetostriction and deteriorating electric behaviour in the composite with the addition of CFO.
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CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 5
·7133-7139
·
IF 2.605
Rui Du,Yujing Bi,Wenchao Yang,Zhe Peng,Meng Liu,Yang Liu,Baoming Wu,Bangcheng Yang,Fei Ding,Deyu Wang
To improve the cyclic stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 cycled between 2.8 and 4.5 V vs. Li/Li + , titanium was incorporated into LiNi 0.8 Co 0.1 Mn 0.1 O 2 at various molar concentrations of 1, 2, 3 and 5% during the synthesis. The XRD , EDS and XPS analyses indicated that the titanium ions were effectively incorporated into the lattice of ternary oxides by occupying the transitional metal positions. Among the investigated molar concentrations, 2% Ti-substituted LiNi 0.8 Co 0.1 Mn 0.1 O 2 exhibited the best multifaceted performances with a relatively high capacity (205.7 mA h g −1 at 0.1 C), good rate capability (178.2 mA h g −1 at 1 C, 155.3 mA h g −1 at 5 C) and acceptable cyclic stability (86.9% at the 200th). The post-mortem analysis indicated that Ti substitution alleviates cracking from secondary particles to primary ones. This behavior is most likely due to the decreased ratio of volumetric deformation ( i.e. , 4.82% for the 2% Ti-substituted sample, which is 19.8% lower than that of the pristine one). Our results demonstrate that mechanical properties may play a crucial role in its long cyclability for use as a high-capacity ternary cathode.
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Materials
·
2026
·Vol. 19
·期 1
·194
·
IF 3.2
Yu Gao,Lipeng Wang,Kun Li,Yongbo Ji
In this work, V-Pt-Ti catalysts were synthesized employing impregnation (IP), precipitation (PC), sol-gel (SG), thermal decomposition (TD), and hydrothermal (HD) methods. A systematic study has been carried out to investigate impacts of various preparation methods on the performance of NH3selective catalytic oxidation (SCO) at temperatures from 150 °C to 450 °C. N2adsorption/desorption, XPS, XRD, H2-TPR, NH3-TPD, O2-TPD, SEM, TEM, and in situ DRIFTS were adopted to characterize the physico-chemical property of V-Pt-Ti catalysts. The results suggested that V-Pt-Ti catalysts synthesized by precipitation methods (denoted as VPT-PC) exhibited notably better SCO performance across the 150–450 °C temperature range compared with those produced by impregnation (IP), sol-gel (SG), thermal decomposition (TD), and hydrothermal (HD) methods. The outstanding performance of the VPT-PC catalyst could be ascribed to its larger surface area, higher relative contents of Pt0, V5+, and Oα, more abundant surface acid sites, and better redox property. In situ DRIFTS results suggested that NO2species could participate in NH3oxidation reaction on the surface of the VPT-PC catalyst, which was beneficial for improving the SCO activity.
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PubMed
高影响因子
Journal of Manufacturing Processes
·
2020
·
IF 4.086
Xiaoping Cai,Keer Li,Changcheng Sang,Xuanru Ren,Leihua Xu,Peizhong Feng
The dissimilar metals joining of Ti/Cu was conducted using a rapid thermal explosion (TE) reaction. The Ni-Al powder mixture was used as TE reaction system, and the effect of temperature (600, 700, 800 and 900 °C) on interfacial diffusions, microstructure and mechanical properties of Ti/Cu joint were investigated. The maximum combustion temperature of Ni-Al interlayer during heating process was 720 °C and a significant exothermic phenomenon was observed for 5 s. The infiltration of melted Al into the Ti/Cu substrate and formed a continuous transition region at the interface of the joints were the dominant joining mechanisms. Microhardness of the interlayer after heated at 900 °C for 30 min possessed prominent improvement from 32.6 to 101.7 HV due to the completely phase transformation of Ni-Al interlayer, which composed of main phase NiAl and minor phase Ni 3 Al. The bond strength of the joint was checked to assess the joint quality. For the joint processed by 900 °C for 30 min, the maximum shear strength of Ti/NiAl and Cu/NiAl were 33.4 MPa and 39 MPa, respectively.
研究领域:
材料科学
·
连接技术
·
金属间化合物
·
微观结构分析
·
力学性能
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高影响因子
WATER RESEARCH
·
2026
·
IF 12.8
Beibei Liu,Na Pan,Chunyi Sun,Weiying Xu,Wen Song,Liangguo Yan,Tao Yan,Yu Du,Yanxia Zhao,Baoyu Gao
Hydrolyzed species critically govern the coagulation behavior of Ti-based coagulants in chemically enhanced primary sedimentation (CEPS), thereby influencing the subsequent anaerobic fermentation of CEPS sludge. However, whether and how preparation-induced Al-Ti speciation modulates solid-liquid interfacial interactions and substrate accessibility during acidogenic fermentation remains unclear, limiting the simultaneous optimization of pollutant removal and resource recovery. Here, polyaluminum-titanium chloride (PATC) composite coagulants with distinct hydrolyzed species distributions were synthesized by slow alkaline titration (S-PATC) and electrodialysis (E-PATC). Compared with S-PATC, E-PATC achieved 99.52%, 68.60%, and 71.38% higher removal efficiencies for PO 4 3− -P, UV 254 , and COD, respectively. The superior CEPS performance was attributed to the synergistic effects of highly charged small species and highly polymerized macromolecular species. Crucially, the hydrolyzed Al-Ti species introduced during CEPS acted as a front-end regulator of sludge fermentability by reconstructing solid-liquid interfacial interactions and modulating substrate accessibility. Compared with S-PATC-loaded sludge, E-PATC-loaded sludge exhibited weaker hydrophilic repulsion and higher volatile fatty acids (VFAs) production, which was associated with enhanced interfacial mass transfer. Under alkaline conditions, enhanced hydrophilic repulsion coexisted with electrostatic repulsion in the E-PATC system, with the latter predominating and promoting greater sludge disintegration. Consequently, the maximum concentration of soluble organic matter increased from 764 mg/L to 2222 mg/L on Day 4, providing abundant substrates for acidogenic microorganisms. As a result, the VFAs yield reached 1250.83 mg-COD/L, which was 6.67% higher than that obtained with S-PATC-loaded sludge. This work provides evidence that hydrolyzed Al-Ti species play a pivotal role in coagulation behavior and subsequent sludge fermentation.
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高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Lingyu He,Xin Zhang,Yang Lei
This study proposes a hybrid electrochemical oxidation-coagulation (EOC) system that integrates a Ti₄O₇ anode with a cathode fabricated from waste aluminum cans, enabling the simultaneous degradation of phosphonates and removal of hardness ions from cooling water. Compared to standalone electrooxidation (EO) and conventional chemical coagulation (CC), the EOC system achieved 41.9% Ca²⁺ removal, 91% total soluble phosphorus (TSP) elimination, and 67.2% conversion of phosphonate to phosphate within 2 hours. Mechanistic studies revealed that the hybrid EOC system performs a synergistic effect, including anodic oxidation of antiscalant (nitrilotris methylene phosphonic acid, NTMP), and the cathodic dissolution of aluminum, generating coagulants that facilitate the concurrent removal of hardness ions and residual phosphorus. The presence of chloride ions enhanced NTMP degradation via the generation of reactive chlorine species (RCS) without impacting Ca²⁺ removal efficiency, whereas the presence of magnesium ions promoted Ca²⁺ removal via Mg(OH)₂ formation, which provides nucleation sites for co-precipitation. On top of mechanical insights, practical validation with real cooling water confirmed the practical effectiveness and robustness of the EOC system. Moreover, energy consumption analysis revealed that the EOC system significantly reduced energy demand for calcium and TSP removal by 91% and 76%, respectively, compared to the EO system. Overall, this work underscores an efficient and cost-effective electrochemical approach for industrial cooling water treatment, establishing foundational insights for scalable implementation.
研究领域:
环境工程
·
电化学
·
水处理技术
·
可持续材料回收
·
工业废水处理
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PubMed
高影响因子
危险品化学品经营许可证（带存储）