Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Cairu Shao,Shuai Li,Hongyang Cao,Lijuan Duan,Wendong Lv,Dongxing Wang,Shuai Rao,Kuifang Zhang,Yusi Jiang,Bin Cai
High concentrations of residual xanthate in mineral processing wastewater often limit the reuse of tailing water. Targeted removal of xanthate is an effective strategy for improving the tailing water recycling rate. In this study, the degradation efficiency and mechanism of sodium ethyl xanthate (SEX) in an electroactivated peroxydisulfate (EAPDS) system were investigated systematically. To avoid the influence of co-existing organic and inorganic matters in real flotation wastewater, we used simulated SEX wastewater to conduct the efficiency and mechanism investigation. A significant synergistic effect between electrocatalysis and peroxydisulfate was observed during the SEX decomposition. When the initial concentration of SEX was 200 mg/L, it achieved 100% removal rate only in 30 min with PDS dosage of 5 mM at current density of 10 mA/cm 2 . The introduction of peroxydisulfate boosted the removal efficiency six-fold compared to electrocatalysis alone. UV-Vis spectroscopy and GC-MS analyses revealed that the intermediate products of SEX were C 2 H 5 OH and CS 2 . The reactive oxygen species induced in the EAPDS were identified using a series of detection methods. • OH, 1 O 2 , h + , O 2 •− and electron transportation process (ETP) all contributed to SEX removal. The degradation mechanism in the EAPDS system was proposed based on the analysis of the reactive oxygen species and products. Application to real flotation wastewater was attempted as well. The effects of different operating conditions were also evaluated, including pH, coexisting anions, PDS dosage, and current density. This study provides a new approach for the rapid removal of residual xanthates from mineral processing wastewater.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Wensheng Yang,Yue Gao,Quan Xie,Tinghong Gao,Yongchao Liang,Qian Chen,Zean Tian,Yunjun Ruan
The Ti substrate, with physicochemical stability and excellent electrical conductivity, is potential to fabricate all-solid-state batteries. However, the Titanium atoms at high-temperature synthesis makes it easy to react with active materials. Modifying the titanium surface with an inert protective layer while ensuring high electrical conductivity remains a significant challenge. Herein, a pencil was used to draw on the Ti substrate and subsequently sintering at a high temperature to obtain a graphite-coated Ti substrate (Ti-Graphite). The experimental results show that Ti-Graphite has a smoother surface and fewer defects in the graphite layer. Moreover, titanium carbide is formed at the interface of graphite and Ti substrate, which will enhance the physicochemical stability of the Ti-Graphite. To gain deep understanding of the evolution mechanism in the synthesis, molecular dynamics simulations were carried out to investigate it. The results exhibit that the voids at the C/Ti interface and stress in the model were significantly decreased after sintering and cooling treatment, proving that Ti-Graphite has a smoother surface, a more stable interface, and fewer defects at the atomic scale. Therefore, we provide a simple and facile strategy to obtain a Ti-graphite substrate with superior physicochemical stability, which reaveals excellent potential to synthesize high-performance all-solid-state batteries.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 1
·269-280
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IF 2.647
Li Xueying,Wang Jiangang,Duan Fenyan,Tao Luwen,Xu Teng,Chen Lizhuang,Yuan Aihua,Wang Xiaolong
The electrode materials with long cycle life are important for the large-scale application of sodium ion batteries. In this work, P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0, 0.057, 0.073, 0.09) were synthesized by molten-salt method. The Ti doping content could influence the crystallographic unit cell volume, particle size, oxygen vacancies, and surface charge density of those samples. When x = 0.073, the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) exhibits superior reversible capacity and rate performance due to the appropriate synergistic effect. In particular, the initial discharge capacity of NCTO-0.073 is about 118.5 mAh g −1 at 100 mA g −1 . Even the current density gets to 1000 mA g −1 , the initial discharge capacity remains 71.7 mAh g −1 after 1000 cycling with the capacity retention of 67.90%. The electrochemical kinetics analysis further prove that the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) owns outstanding electrical conductivity and fast sodium ion diffusion behavior to promote the electrochemical reaction during the charging/discharging. These results will contribute to the industrialized application of stable high-performance cathodes for sodium ion batteries.
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POWDER METALLURGY AND METAL CERAMICS
·
2021
·Vol. 59
·期 11
·651-660
·
IF 0.511
Zhangjun Bai,Yuhong Chen,Lu Li,Jiaxin Li,Yuewei Cheng
In this study, Ta–W–Ti–Al multialloys were prepared by spark plasma sintering (SPS) as a new powder metallurgy technology based on discharge activation and thermoplastic deformation process. The oxidation behavior of the as-obtained sintered alloys were investigated under 1000 and 1200°C in air atmosphere. Microstructures and phase compositions of alloys and oxides were analyzed using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and backscatter electron microscopy (BSE). The sintered samples possessed relative densities reaching up to 98% with achievable densification. The densities of all specimens with high Ti contents exceeded 100%, suggesting the great impact of Ti addition on liquid-phase precipitation. Intermetallic compounds were formed in Ta–W–Al alloys, and samples with high Ti contents displayed grain boundary phases rich in titanium and oxygen. The addition of Ti and Al effectively improved the oxidation resistance of the resulting alloys. A protective alumina layer was formed after oxidation at 1000°C that made oxidation kinetics of the alloys obeying pseudo-parabolic laws. At the oxidation temperature of 1200°C, Al 2 O 3 reacted with Ta 2 O 5 to form the AlTaO 4 alloy with reduced protective effect. The mass gain in the alloys after oxidation at 1200°C for 4 h was about 7 times higher compared to processing at 1000°C.
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Fundamental Research
·
2022
·
IF 0
Zhenghao Pu,Wei Wang,Zhe Wang,Mingyin Kou,Yiwa Luo,Jianbang Ge,Xin Tao,Mingyong Wang,Shuqiang Jiao
Despite its existence for more than 80 years, the titanium industry is still challenged by massive carbon emissions, high production costs, and large resource waste. More than one hundred million tons of Ti−bearing blast furnace slag (TB−slag) has been discarded in China because of the difficulty of reutilization, which requires efficient titanium extraction and recovery technologies. This paper describes a low−cost, carbon−emission−free method for Ti extraction and oxygen evolution via molten oxide electrolysis (MOE) vacuum distillation. After a comprehensive analysis of the binding energies and activities of liquid metals, the highlights of our study are as follows. 1) Sb has the best preferential deposition of Ti among a series of high−Ti−affinitive liquid metal cathodes (Cu, Ni, Pb, Sn, and Sb). 2) The Ir anode was first used in TB−slag with IrO 2 formed on its surface to protect it from further corrosion. 3) An alloy containing Ti and Ca can be obtained by MOE, and Ti and Ca metals can be refined by further vacuum distillation. 4) A closed loop is formed in the overall process owing to the recyclable Sb cathode and continuous feeding of TB−slag into the electrolyte. This simple, low−cost, and environmentally friendly method can realize the efficient utilization of Ti resources and achieve carbon neutrality.
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SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Qixiang Zhan,Shuhua Deng,Jiayi He,Jinhua Xu,Anfu Chen,Jiajun Luo,Wenjie Zhang,Caihong Lei
The elasticity mismatch between Ti and tissue limits the performance of Ti medical devices. How to create a coating with mimicking natural soft tissue stiffness and possessing strong mechanical bond is a challenge in implant manufacturing. Here, we developed a combined coating, that is, an anodized Ti surface (ATS) with nanostructures coated with a layer of PAAm hydrogel with tunable elasticity. Due to the nano-mechanical interlocking and hydrogen bonding synergy, the PAAm hydrogel layer was tightly anchored in nanostructures on the ATS. By regulating the oxidation voltage, nanostructures including nanopores, nanotubes, and punch-through nanotubes were fabricated on the ATS, and these three kinds of anodized nanostructures increase the porosity of the ATS sequentially. The lap shear test has shown that the shear strength increases linearly with increasing the porosity, and the shear strength of the punch-through nanotube structures with the PAAm hydrogel coating reaches 59.28 kPa. The adhesion mechanism between the anodized Ti nanostructures and the PAAm hydrogel coating is mainly due to the nano-mechanical interlocking and hydrogen bonding synergy, which was proven by morphology analysis, XRD, and ATR-FTIR characterization of the samples subjected to lap shear load. The hydrogel-nanostructures coating has demonstrated the potential to be applied in Ti medical devices.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Shengdong Sun,Hui Liu,Longlong Fan,Yang Ren,Xianran Xing,Jun Chen
Grain size effect plays a vital role in piezoelectric performance from both scientific and technological view. However, the underlying structural mechanism related to grain size is still unclear. In the present study, the structural mechanism of grain size effect on piezoelectric performance has been revealed in the prototype Pb(Zr,Ti)O 3 system by using in-situ synchrotron X-ray diffraction. The miniaturization of grain size tends to favor the appearance of higher symmetric tetragonal phase, while a single monoclinic phase is determined in the coarse-grained ceramics. The direct structural evidence reveals that both tetragonal and monoclinic phases in the fine-grained ceramics are less sensitive to the electric field, corresponding to the inferior piezoelectric performance, while the single monoclinic phase in the coarse-grained ceramics is more active to be driven by the electric field, generating good piezoelectric behavior. Both domain switching ability and lattice strain are suppressed with decreasing grain size, which directly leads to the deterioration in piezoelectric performance. The current results will benefit the structural understanding of the size effect of piezoelectric and other related systems.
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Nature Communications
·
2026
·
IF 18.1
Zhang Yan,Yan Ning,Zhou Bing,Zhan Guangming,Wang Jiaxian,Zhao Long,Hu Lufa,Wang Kaiyuan,Xu Junzhou,Cheng Ke,Zhou Lingzhi,Gu Xiang-Kui,Yao Yancai,Zhang Lizhi
Electrocatalytic nitric oxide reduction (NORR) enables the efficient abatement of NO while simultaneously synthesizing valuable ammonia (NH 3 ). However, the strong polarity of NO hinders its effective activation on conventional NORR catalysts because of their single-site interaction mode, wherein either the nitrogen (N) or oxygen (O) atom of NO binds to the catalyst through a unidirectional electron transfer. In this study, we construct dual-atom Cu 1 −Ti pairs on the titanium oxide (TiO x ) substrate by using the complementary affinities of Ti for nitrogen and Cu for oxygen, which simultaneously activates both ends of the N=O bond. The designed Cu 1 −Ti pairs achieve competitive NORR performance with an NH 3 yield of 189.9 μmol h −1 cm −2 and a Faradaic efficiency of 93.7%. In situ techniques and theoretical calculations demonstrate that this dual-atom configuration shifts the mechanism from an end-on adsorption pathway observed on homonuclear pairs to a fully activating side-on mode. By highlighting the importance of adapted active site design in the electrocatalytic activation of polar molecules, this study facilitates the development of next-generation catalysts for complex transformations.
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PubMed
高影响因子
MATERIALS LETTERS
·
2026
·
IF 2.6
Yi Xu,Jian Zhou,Xiaozhi Wang,Chenchen He,Zemin Yu,Jiayi Du,Xiaoyong Wei,Yujun Feng,Zhuo Xu,Ran Xu
The phase transition behavior of Pb(Hf 1- x Ti x )O 3 (PHT) ceramics with low Ti content (x = 0.02–0.06) was systematically investigated. Results reveal that increasing Ti content induces the transition from the antiferroelectric (AFE) to the ferroelectric (FE) phase, with the phase boundary located near x = 0.05 (95/5 composition). For PHT 98/2, a dielectric anomaly at 125 °C corresponds to an AFE I → AFE II transition. In PHT 96/4, a high-temperature ferroelectric phase was identified, with a sequential phase evolution of AFE → FE → PE upon heating. PHT 95/5 exhibits clear ferroelectric behavior but retains a partial AFE component, resulting in a non-monotonic temperature dependence of remnant polarization ( P r ). These findings suggest that the AFE/FE phase boundary in the PHT system lies near 95/5 and that its phase transition characteristics closely resemble those observed in Pb(Zr 1- x Ti x )O 3 (PZT)-based materials.
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高影响因子
Materials Today Chemistry
·
2026
·
IF 7.4
Rui Huang,Shaohua Luo,Qi Sun,Lixiong Qian,Shengxue Yan
Although lithium-ion batteries (LIBs) offer high energy density and long cycle life, their large-scale application is hindered by the scarcity and high cost of lithium resources. sodium-ion batteries (SIBs) have emerged as a promising alternative for large-scale energy storage due to the abundance and low cost of sodium. However, the development of high-performance SIBs is impeded by structural instability in cathode materials, primarily caused by the relatively large ionic radius of Na + , which induces lattice strain and phase transitions during cycling. In this work, a Fe/Ti co-doped tunnel-type sodium manganese oxide cathode material, Na 0.55 Mn 0.9 Fe 0.05 Ti 0.05 O 2 (NaMO55-FT5), was successfully synthesized via a high-temperature solid-state method. The structural evolution and electrochemical behavior of the material were systematically investigated. It was found that synergistic Fe/Ti doping effectively expanded Na + interlayer spacing, mitigated Jahn-Teller distortion through Mn 3+ stabilization, and disrupted Na + /vacancy ordering, thereby enhancing both Na content and structural integrity. As a result, the NaMO55-FT5 material delivered an initial discharge capacity of 98.5 mAh g −1 at 0.5C, retains 72.0% of its capacity after 300 cycles, and maintained a reversible capacity of 55.2 mAh g −1 at a high rate of 5C, demonstrating outstanding cycling stability and superior rate capability. This study presented a rational design strategy based on dual-metal co-doping for developing high-sodium-content, structurally robust tunnel-type cathode materials, offering valuable insights for advancing the practical deployment of SIBs in grid-scale energy storage applications.
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高影响因子
AICHE JOURNAL
·
2026
·
IF 4.4
Dai Zhang,Hang Zhu,Xiaofeng Xu,Yueqiang Cao,Wei Li,Jinghong Zhou,Xinggui Zhou
Gas-phase catalytic synthesis of glycolide (GL) from methyl glycolate (MG) offers a promising route for sustainable production of polyglycolic acid, yet suffers from unfavorable catalytic performances due to limited mechanistic understandings. Here, a series of Ti/SiO 2 catalysts supported on mesoporous materials with distinct pore structures were synthesized to elucidate the structure–performance–mechanism relationship. Among them, Ti/KIT-6 exhibited the highest MG conversion and GL yield, attributed to its large pore size, three-dimensional interconnected mesostructure, and well-dispersed tetrahedral Ti(IV) species. Comprehensive structure characterizations and mechanistic studies establish a linear correlation for MG conversion rate and GL formation rate with the tetrahedral Ti(IV) content, pointing to Ti(IV) as the intrinsic active sites. Further combining with temperature-programmed and in situ spectroscopy experiments, a possible reaction mechanism is proposed for MG-to-GL on the active site. This study provides mechanistic insights to guide design of Ti-based catalysts for gas-phase ester cyclization reactions.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2026
·
IF 3.6
Qiang Li,Mingxin Yan,Hao Sun,Xuyan Liu,Yuqing Miao,Rongbin Li,Masaaki Nakai,Mitsuo Niinomi,Takayoshi Nakano
A two-step electrochemical method was employed to fabricate iodine-containing TiO 2 nanotubes composite coatings on pure Ti, with the objectives of enhancing coating-substrate adhesion and antibacterial performance. TiO 2 nanotubes were synthesized via anodic oxidation followed by iodine electrodeposition in 0.2% povidone-iodine solutions without KI and with varying concentrations of KI, respectively. The samples were characterized via SEM, EDS, and XPS. The coating-substrate adhesion, antibacterial activity, and cytotoxicity were systematically evaluated. The results indicate that KI addition enhances the electrical conductivity of the electrolyte and thus accelerates iodine deposition, while excess I − leads to damage of nanotubular structure. The electrodeposited iodine species primarily exist in the forms of I 3 − , I 2 , and pentavalent iodine. The TiO 2 nanotubes retard the iodine release rate. With increasing KI concentration, the coating-substrate adhesion first increases and then decreases. The sample fabricated in the electrolyte with 0.05% KI achieves the maximum adhesion (28.7 ± 1.5 N). This optimal sample demonstrates antibacterial rates of 88.7% and 92.7% against E. coli and S. aureus , respectively while displaying negligible cytotoxicity. This two-step electrochemical approach for fabricating iodine-containing TiO 2 nanotubes composite coatings serves as a viable surface modification strategy for Ti implants, yielding antibacterial coatings with substantial clinical potential.
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