JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Hailiang Li,Dechang Jia,Zhihua Yang,Yu Zhou
A facile heat treatment strategy suitable for TiB reinforced titanium matrix composites (TMCs) fabricated by selective laser melting (SLM) is proposed. The effects of boron modification and heat treatment on the microstructure and mechanical properties of the selective laser melted TMC samples were systematically investigated. The ultrafine ∼2 vol% TiB whiskers that formed in situ exhibited a much more homogeneous distribution in the matrix compared to that of conventionally processed composites containing similar volume fractions, further promoting the formation of fine equiaxed α-Ti grains throughout the matrix. An excellent combination of strength and fracture strain of 1428 MPa and 43.6%, respectively, was simultaneously achieved for the heat-treated TMC, in which the plasticity was improved by 126% over that of the as-fabricated composite (19.3%). This finding provides significant guidance for tailoring the microstructure in selective laser melted TMCs to achieve the desired mechanical properties.
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Green Energy & Environment
·
2026
·
IF 14.6
Lijun Xiong,Dandan Zhu,Chenglong Qiu,Weihong Zeng,Mingshi Xu,Shanshan Wang,Yong Yang
The photocatalytic reduction of carbon dioxide (CO 2 ) into high-value C 2+ hydrocarbons represents a sustainable pathway to alleviate energy shortages and reduce atmospheric CO 2 levels. In this study, a unique tandem photocatalyst (CoTi-CN), is constructed by integrating bimetallic CoTi-MOF with metal-free half-metallic C(CN) 3 . This composite demonstrates markedly enhanced activity and selectivity in the photocatalytic CO 2 reduction to ethylene (C 2 H 4 ), achieving a C 2 H 4 selectivity of 36.8% and a generation yield of 31.3 μmol g −1 over 5 h. Density functional theory (DFT) calculations combined with in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis reveal that C(CN) 3 acts as an efficient CO 2 to CO converter, while CoTi-MOF favors the adsorption and C-C coupling of *CO intermediates. The spatially decoupled CO generation and C-C coupling processes lead to optimized intermediate coverage and reduced energy barriers, resulting in superior selectivity toward multi-carbon products. This work opens new horizons for the design of tandem photocatalysts that combine half-metallic catalysts with bimetallic MOFs, achieving a significant enhancement in the activity and selectivity of photocatalytic C 2 H 4 production.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2026
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IF 5.9
Hanan Al-Fakeh,Hasan M. Sharhan,Zheng Nan Nan,Cao Hongjuan,Wu Lin
MAO of Ti–2.5Ag yields micro-porous TiO₂ with enhanced roughness and hydrophilicity. • MAO porous structure sustains sub-cytotoxic Ag⁺ multiphasic release over 7 days. • MAO + Ag surface reduces P. gingivalis biofilm despite enhanced hydrophilicity. • Protein leakage confirms Ag⁺–SH membrane disruption as the bactericidal mechanism. • Ti–2.5Ag + MAO offers dual infection resistance with osseointegration-safe surface. Titanium implants remain susceptible to bacterial colonization by Porphyromonas gingivalis , a keystone pathogen in peri-implantitis, and although silver (Ag) incorporation and micro-arc oxidation (MAO) have each been explored individually, their combined effect on low-silver titanium alloys against anaerobic oral pathogens remains poorly characterized. This study fabricated CP-Ti, Ti–2.5Ag (Ti+Ag), and MAO-treated Ti–2.5Ag (Ti+Ag+MAO) surfaces and evaluated their physicochemical properties and antibacterial performance against P. gingivalis over seven days. MAO generated a micro-porous TiO₂ oxide layer (32.6% porosity) incorporating phosphorus and silicon, significantly increasing roughness Ra = 0.0846 µm; p < 0.01) and hydrophilicity (contact angle: 36.33°–41.34°; p < 0.05) versus CP-Ti. Cumulative Ag⁺ release from Ti + Ag + MAO reached 0.844 ppb by day 7, approximately twice that of Ti + Ag (0.399 ppb; p < 0.05), following a multiphasic release profile. Against P. gingivalis , Ti + Ag + MAO achieved adherent bacterial inhibition exceeding 91% by day 7 (versus 73% for Ti+Ag), with dead-cell percentages rising from 57.56% to 76.25% (p < 0.001 vs. both comparators). Crystal violet and protein leakage assays confirmed sustained anti-biofilm activity and progressive membrane disruption (p < 0.01–0.001), consistent with the observed Ag⁺ release kinetics. These findings demonstrate that MAO synergistically amplifies the antibacterial efficacy of Ti–2.5Ag through combined anti-adhesive and sustained ion-release-mediated mechanisms, establishing Ti + Ag + MAO as a promising multifunctional strategy for reducing peri-implant infections.
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International Journal of Electrochemical Science
·
2023
·Vol. 6
·期 9
·4341-4354
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IF 1.5
Zhiqiao He,Chengxiang Huang,Qiong Wang,Zhe Jiang,Jianmeng Chen,Shuang Song
A series of praseodymium modified Ti/SnO 2 -Sb/PbO 2 (Ti/SnO 2 -Sb/PbO 2 -Pr) electrodes were synthesized by doping PbO 2 with praseodymium and the effect of Pr doping on the electrode catalytic activity toward the anodic oxidation of the model dye C.I. Acid Black 194 (AB-194) was examined in aqueous solution. The electrocatalytic activity of a Ti/SnO 2 -Sb/PbO 2 electrode can be greatly improved by adding an appropriate amount of Pr into the PbO 2 layer. Accelerated life tests indicate that Pr doping also dramatically improves the stability of the Ti/SnO 2 -Sb/PbO 2 anode. The introduction of Pr enhanced the formation of oxygen vacancies and surface hydroxyl groups, resulting in better activity and stability of the Ti/SnO 2 -Sb/PbO 2 -Pr electrode. A possible degradation pathway of AB-194 during the anodic oxidation process is proposed based on hydroxyl radical attack of the organic reactant.
研究领域:
电化学
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环境工程
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材料科学
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水处理
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122692
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IF 7.5
Huanggen Yang,Shulun Yin,Pei Zhang,Qi Zheng,Faisal Alresheedi,Imran Shakir,Saleem Raza,Duofu Li,Yan Sui
The energy crisis calls for eco-friendly alternatives, and hydrogen production presents a viable solution. As a clean energy source, hydrogen can be produced from water using renewable power, decreasing dependence on fossil fuels and substantially cutting greenhouse gas emissions paving the way for a greener future. This work involves the fabrication of Ti 3 C 2 T x and NH 2 -MIL-125(Ti) by hydrothermal procedures. Ti 3 C 2 T x material served as the substrate for the immobilization of NH 2 -MIL-125(Ti), which were then incorporated into sodium alginate to generate (Ti 3 C 2 T x @NH 2 -MIL-125(Ti)-SA). The electrocatalytic efficacy of Ti 3 C 2 T x @NH 2 -MIL-125(Ti)-SA was evaluated for the hydrogen evolution reaction (HER) under alkaline factors using a 1 M KOH electrolyte. The material demonstrated exceptional capacitance, impressive rate capability, and sustained stability during 1000 cycles over a 24 and 48 h. The Ti₃C₂Tₓ@NH₂-MIL-125(Ti)-SA composite exhibits excellent HER catalytic activity in alkaline media, delivering a low overpotential of 14 mV at 10 mA cm⁻² and a Tafel slope of 56.4 mV dec⁻¹ . Although the benchmark Pt/C catalyst shows slightly superior performance (12 mV, 41.1 mV dec⁻¹), the developed composite demonstrates comparable activity, along with advantages of structural stability and cost-effectiveness compared to noble metal-based catalysts. Overall, Ti 3 C 2 T x @NH 2 -MIL-125(Ti)-SA demonstrates excellent electrode performance in alkaline conditions, as compared with pristine Ti 3 C 2 T x and NH 2 -MIL-125(Ti), which marked by remarkable stability, low Tafel slope values, and minimized overpotentials, underscoring its significant promise for efficient water splitting applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Zehui Zhu,Weiguang Hu,Xiao Wu,Qinguo Zhang,Yan Hu,Qing Yan,Xuefei Wang,Weiyong Yuan
Highly efficient metal–organic framework (MOF)-based oxygen evolution reaction (OER) catalysts are desirable for water splitting, but their development remains challenging due to poor accessibility of coordinatively unsaturated metal (cum) sites and low intrinsic activity. A large-area three-dimensional (3-D) macroporous interconnected nanosheet array of Ni-1,3,5-benzenetricarboxylate has been in situ self-assembled on Ti mesh (TM) by using ethanol as the solvent and high-affinity oxide layer on TM to promote in situ nucleation. The obtained nanoarchitecture exhibits much superior catalytic activity compared to most reported catalysts including MOF-based catalysts, other precious-metal-free ones, and Ir/Ru-based ones. Additionally, this electrode undergoes no current decay after 300 cyclic voltammetry (CV) cycles and can maintain at 250 mA cm −2 for over 266 h. The excellent catalytic performance is mainly due to the 3-D macroporous and interconnected nanosheet array structure improving cum site exposure and charge transport and in situ activated cum cations enhancing OH − adsorption. This work not only develops a facile and economical approach to synthesize 3-D macroporous interconnected MOF nanosheet arrays to simultaneously increase the number, exposure, and intrinsic activity of active sites and facilitate charge transport for high-performance eletrocatalysis, but provides scientific insights into the mechanisms for self-assembly of this unique nanoarchitecture and for the high OER performance.
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Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
jialong Kang,Zhenyun Tian,Dapeng Zhong
The abundant metal Ti is a high-quality metal with lightweight, high strength, and corrosion resistance. However, due to its harsh preparation conditions, the price remains high, so titanium metal's simple and effective products have become a challenge for the world's scientific research community. In this paper, by calculating the oxygen potential of Ti–O, Ti–H, and Ti–H–O solid solutions, the oxygen potential of Ti–H–O was obtained when the oxygen content was 0.03 and 0.009. As H 2 enters the Ti–O lattice, the oxygen potential of the Ti–H–O system increases with the increase of H content. Thermodynamic calculations showed that introducing hydrogen effectively destroyed the stability of Ti–O solid solutions. At the same time, this paper uses a magnesiothermic as a reducing agent. To verify the feasibility of the above thermodynamics, reduce the spent V 2 O 5 –WO 3 /TiO 2 catalyst (Ti > 80 wt%) of titanium-rich materials in a hydrogen atmosphere. Finally, the spent V 2 O5–WO 3 /TiO 2 catalyst was reduced at 750 °C for 8–24 h to obtain TiH 2 powder with an oxygen content of 0.9 wt%.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 9
·4277-4287
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IF 3.3
Jiaxin Mou,Yunlan Xu,Dengjie Zhong,Haixing Chang,Jun Li,Chunzi Xu,Hui Wang,Hongyu Shen
To expand the optical absorption range and charge transfer efficiency of photoanode, the ZnIn2S4/PANI/TiO2/Ti photoanode was developed using a coating method and applied in a photocatalytic fuel cell (PFC) system for the removal of organic pollutants and chemical energy recovery. The prepared photoanode obtained a maximum photocurrent density of 4.19 mA cm−2 (1.2 V vs. SCE). The rhodamine B (RhB) removal efficiency, maximum power density (Pmax) and short-circuit current density (Jsc) of PFC constructed with the ZnIn2S4/PANI/TiO2/Ti composite photoanode and Cu cathode were 93.80% (1 h), 18.83 μW cm−2 and 0.26 mA cm−2, respectively. The improved photocatalytic activity of PFC was due to the outstanding photoelectric properties of the ZnIn2S4/PANI hybrid material, in which PANI, as a photosensitizer, promoted the absorption of visible light by the photoanode. The photoexcited electrons of ZnIn2S4 and PANI tend to be directly transferred to the CB of TiO2, while holes accumulate in the VB of PANI to participate in the oxidation reaction. The synergistic effect accelerates the separation of photogenerated electron–hole pairs and improves the photoelectric conversion efficiency of PFC.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Liang Xu,Lei Su,Hongjie Wang,Hongfei Gao,Pengfei Guo,Min Niu,Kang Peng,Lei Zhuang,Zhiwei Dai
Materials with ultralow thermal conductivity and good thermal stability are of great interest in numerous applications such as energy storage and conversion devices, and thermal insulation components. In this work, a family of high-entropy Sm 2 B 2 O 7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) oxides with highly disordered cations on the B-site has been synthesized by introducing large atomic-size mismatch, mass and charge disorder. Through tuning the composition, the high-entropy Sm 2 B 2 O 7 oxides can be engineered from pyrochlore to fluorite structure, accompanied with an order-disorder transition. The pyrochlore Sm 2 (Nb 0.2 Sn 0.2 Ti 0.2 Y 0.2 Zr 0.2 ) 2 O 7 and fluorite Sm 2 (Nb 0.2 Ta 0.2 Y 0.2 Yb 0.2 Zr 0.2 ) 2 O 7 exhibit low thermal conductivities of 1.35 W·m −1 ·K −1 and 1.23 W·m −1 ·K −1 , respectively, indicating their good thermal insulation. In addition, the high-entropy fluorite Sm 2 (Nb 0.2 Ta 0.2 Y 0.2 Yb 0.2 Zr 0.2 ) 2 O 7 also shows average thermal expansion coefficient of 10.2 × 10 −6 °C −1 and high-temperature stability even after thermal exposure at 1600 °C in air for 30 h. These results indicate that the high-entropy Sm 2 B 2 O 7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) can be promising candidates for thermal barrier coatings and thermally insulators.
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CHINESE CHEMICAL LETTERS
·
2023
·
IF 9.1
Yifen He,Chao Qu,Na Ren,Dawei Liang
ABSTRACT Recently, a novel 2-electron oxygen reduction reaction (ORR) based electro-oxidation (EO) system was developed, which utilizes a H 2 O 2 generation cathode instead of H 2 evolution cathode. A Ti-based Ni-Sb co-doped SnO 2 (Ti/NATO) anode was selected for efficient degradation of refractory organics and O 3 production. The synergistic reaction of O 3 /H 2 O 2 further accelerated the generation of hydroxyl radicals ( • OH) in the ORR-EO system. However, the catalytic activity and long-term effectiveness of the Ti/NATO anode limited the large-scale application of the ORR-EO process. In this study, a blue TiO 2 nanotube array (blue-TiO 2 -NTA) inter-layer was introduced into the fabrication process between the Ti substrate and NATO catalyst layer. Compared to the Ti/NATO anode, the Ti/blue-TiO 2 -NTA/NATO anode achieved higher efficiency of organic removal and O 3 generation. Additionally, the accelerated lifetime of the Ti/blue-TiO 2 -NTA/NATO anode was increased by 7 times compared to the Ti/NATO anode. When combined with CNTs-C/PTFE air cathode in ORR-EO system, all anodic oxidation and O 3 /H 2 O 2 processes achieved higher • OH production. Over 92% of TOC in leachate bio-effluent was effectively eliminated with a relatively low energy cost of 45 kWh/t.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Jingyun Zhao,Zexu Chi,Heng Dong,Changfu Sun,Han Yu,Hongbing Yu
This study explored the depth treatment of desphenly chloridazon (DPC) wastewater by a novel synergetic dual-electrodes electrocatalytic (SDEs) system which consisted of Ni–Sb–SnO 2 /Ti anode (NSSTA) and PEDOT/PSS-CNTs modified activated carbon air diffusion cathode (PP-CNTs AC ADC). NSSTA exhibited an enhanced capability to produce reactive oxygen species (·OH and O 3 ), its O 3 production increased to 6.54 mg/L. PP-CNTs AC ADC was observed to have improved activity of catalyzing oxygen reduction reaction (ORR) with 648.23 mg/L H 2 O 2 generated. Owing to the synergetic effect of O 3 and H 2 O 2 , additional ·OH was obtained in SDEs system through the electro-peroxone reaction. Compared with the single-electrode electrocatalytic (SE) systems, the SDEs system showed superior pesticide degradation performance , higher mineralization current efficiency (MCE) and lower energy consumption (EC). In the SDEs system, the optimal 91.7% of DPC removal efficiency and 90.7% of DPC mineralization efficiency were obtained within 150 min by electrocatalytic oxidation of 17.5 ppm and 25 ppm pesticide wastewater at the current density of 11.94 mA/cm 2 , respectively. The treated water showed reduced acute toxicity than that of the raw wastewater, which suggested that the SDEs system is a promising technology for depth treatment of the pesticide industry effluent with simultaneous decontamination and detoxification realized.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Chao Shan,Hui Liu,Ming Hua,Bingcai Pan
The development of catalysts for oxidation of aqueous contaminants has long been relying on trial-and-error strategies due to lack of activity-tuning principles. Herein, Fenton-like oxidation of As(III) as a chemisorbed model contaminant over a series of fabricated CexTi1-xO2 catalysts with tunable structures was investigated. The activity of CexTi1–xO2 showed a volcano-shape dependency on Ce molar fraction, peaking at Ce0.25Ti0.75O2 (x = 0.25) with 6.32–6.36 times higher activity and 2.67–2.94 times higher specific activity compared with CeO2 and TiO2. The non-radical surface hydroperoxo complexes were experimentally substantiated as the dominant oxidant species on Ce0.25Ti0.75O2, which enabled a high efficiency of H2O2 utilization (99.1%). Under the verified Langmuir–Hinshelwood mechanism, the microkinetic model for the catalytic oxidation was established, and thus, the quantitative relationship between activity and adsorption energies for bimolecular chemisorption reactions was elucidated. Theoretically, a catalyst with identical adsorption energies toward both chemisorbed reactants tends to obtain the highest activity. Through DFT calculation, the highest activity of Ce0.25Ti0.75O2 was rationally interpreted by the balanced adsorption energies toward As(III) and H2O2, which was attributed to the shifted electronic density of states induced by Ce doping. This study provides a potent strategy to tune the catalytic activity of bimolecular chemisorption reactions.
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