APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 19.7
Wanyin Xu,Yuanhao Chen,Tianhe Gao,Zihan Wang,Wenkang Miao,Peng Wang,Qianqian Li
Successfully tailored a dual-site architecture comprising Cu + /Ni δ+ -O V -Ti and CuNi NPs on the ultra-small TiO 2 support-derived from MIL-125(Ti). • Deeply revealed the defect rich Cu + /Ni δ+ -O V -Ti site promotes CO 2 adsorption, while the CuNi NPs with electron redistribution facilitates H 2 adsorption and desorption of the product CO. • Significantly enhanced the RWGS reaction activity and sintering-resistance. Copper (Cu)-based catalysts hold promise for the reverse water-gas shift (RWGS) reaction because of their 100% selectivity toward CO. However, their low intrinsic activity, and deactivation caused by irreversible sintering during RWGS reaction remain persistent challenges. Herein, we report a pore adsorption strategy to simultaneously achieve electronic structure modulation and preserve microstructure stability during the RWGS reaction. Specifically, a MOF-derived TiO 2 -supported CuNi catalyst is constructed with dual active sites consisting of Cu + /Ni δ+ -O V -Ti sites and CuNi nanoparticles (NPs). The optimized catalytic performance achieves CO 2 conversion of 37.1% with CO selectivity of 99.9% and operates stably for 200 h at 450 ℃, placing its performance among the advanced Cu-based catalysts reported to date. Atomic/electronic structure characterization and density functional theory calculations demonstrate that Cu + /Ni δ+ -O V -Ti sites with enhanced charge redistribution capability promote CO 2 adsorption. The CuNi NP sites with electronic interaction enhance H 2 adsorption and moderate CO adsorption. This work provides a rational design strategy for highly active, selective and stable Cu-based RWGS catalysts. Download: Download high-res image (286KB) Download: Download full-size image Dual active sites consisting of Cu + /Ni δ+ -O V -Ti sites and CuNi NPs are constructed in the MOF-derived CuNi/TiO 2 catalyst, enabling electronic modulation and structural stabilization for enhanced RWGS reaction.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Zemin Li,Rongbo Li,Benxing Li,Yuqi Zhu,Jiale Lin,Chongqing Wang,Rujing Hou,Yichang Pan
The separation of hexane isomers in petrochemical engineering is energy-intensive, driving the need for membrane-based alternatives to conventional thermal processes. Mixed-matrix membranes (MMMs) offer a material platform by combining the processability of polymer matrices with the high structural tunability of porous fillers. In this work, we fabricate UiO-66-Tix/tPIM-1 MMMs by incorporating Ti-regulated bimetallic Zr/Ti-UiO-66 fillers into a thermally treated polymer of intrinsic microporosity (tPIM-1) matrix. At low Ti contents, the UiO-66-type crystallinity is largely preserved, while Ti introduction produces measurable changes in the pore characteristics and nHex/22DMB adsorption kinetics. Membrane-level sorption measurements show preferential nHex uptake, while adsorption-kinetic analysis and molecular dynamics simulations of both the isolated frameworks and the UiO-66-Ti 0.2 /tPIM-1 composite environment indicate stronger diffusion restriction toward bulky 22DMB than toward linear nHex. Collectively, these results support an adsorption–diffusion transport mechanism for the observed separation behavior. Among the Ti contents and filler loadings investigated, the selected 5 wt% UiO-66-Ti 0.2 /tPIM-1 membrane achieves a flux of 515 g·m −2 ·h −1 and a separation factor of 7.9 for nHex/22DMB separation. The membrane also maintained relatively stable performance during 84 h of continuous operation and preferentially enriched nHex from multicomponent C6 isomer mixtures, showing competitive separation performance among reported MMMs for hexane isomer separation. These results indicate that controlled Ti introduction provides a route to modify the pore characteristics of UiO-66 and improve nHex/22DMB discrimination in thermally treated PIM-1-based MMMs.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Muhammad Nasir Rafiq,Zhonghua Dai,Yuanyuan Zheng,Xujun Li,Chenxi Liu,Xin Zhao,Yu Cong,Shuitao Gu
Lead-based ceramics with high energy storage and electrical capabilities are developed as high-performance materials for pulsed power systems. The (Pb, Cd, La)(Zr, Sn, Ti)O 3 (PCLZST) anti-ferroelectric ceramics attract significant attention as energy storage materials. In this work, ceramics (Pb 0.97- x Cd x La 0.02 )(Zr 0.93 Sn 0.05 Ti 0.02 )O 3 ( x = 0.01, 0.015, 0.02 and 0.025) have been prepared using a solid-state method, and their dielectric and energy storage characteristics are investigated. The results indicate that Cd 2+ doping at the A-site effectively suppresses grain growth, leading to a minimum average grain size of 1.24 μm in PCLZST ceramics. The PCLZST ceramics exhibit orthorhombic phases and high relaxation factors, confirming their excellent antiferroelectric nature. Notably, the energy storage density of PCLZST ceramics is 10.09 J/cm 3 , the recoverable energy storage density is 7.79 J/cm 3 , and the discharge time is 0.102 μs reflecting optimal comprehensive performance. These findings emphasize the efficacy of Cd-doped PLZST ceramics in advanced energy storage and pulse power systems, underscoring their potential to drive future technological advancements.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xin Li,Qingquan Kong,Xuguang An,Jing Zhang,Qingyuan Wang,Weitang Yao
We propose a synergistic strategy of titanium doping and surface coating with a Mn-rich shell to modify the Na-rich manganese-oxide-based cathode material Na 0.67 Ni 0.33 Mn 0.67-x Ti x O 1.9 F 0.1 in sodium-ion batteries and elucidate the underlying mechanism for enhanced material performance. First, it is found that the electrochemical performance of the proposed cathode material can be effectively improved when the Ti doping amount is x = 0.3. In addition to doping, the cathode material coated with a manganese-rich shell was prepared by a liquid coating method. The as-prepared Mn@Ti-doped-Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 exhibited excellent electrochemical performance, delivering 169 mAh/g discharge capacity. The charge–discharge cycle test was carried out at a current density of 2C, and the sample not only provides a reversible capacity of 119 mAh/g but also has a capacity retention rate of 71 % after 500 charge–discharge cycles. The Ti doping and surface coating with a Mn-rich shell are shown to improve the specific discharge capacity, cycling stability and rate capability of the cathode material and mitigate voltage decay. These results validate our design principle and provide a novel approach to enhance the performance of cathode materials in sodium-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
·
无机化学
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固体物理
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纳米材料
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电池技术
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Youzhou He,Yuwei Tan,Mengyu Song,Qingli Tu,Min Fu,Liangjun Long,Jie Wu,Mengmeng Xu,Xingyan Liu
Photocatalysis technology has been widely adopted to abate typical air pollutants. Nevertheless, developing photocatalysts aimed at improving photocatalytic efficiency is a challenge. Herein, the linker-defect NH 2 -MIL-125(Ti) photocatalyst was synthesized through a convenient one-step heating-stirring method (just adjusting multiple temperatures) to firstly realize efficient photocatalytic performances of NO removal and hydrogen evolution . The optimal sample (named 65-NMIL) with a linker-defect content of 32.08% exhibited a NO removal ratio of 65.49%, which was 37.57% higher than that of pristine NH 2 -MIL-125(Ti), and displayed better H 2 -production activity. Through ESR, it was confirmed that 65-NMIL can generate more •O 2 - and •OH under visible light, and the radical trapping experiment further proved that •O 2 - played a more important role in photocatalytic activity. Moreover, the photocatalytic NO oxidation process was also monitored by in situ DRIFTS , it was found that the defective samples could promote the oxidation of NO and intermediates to the final product (NO 3 - ). On the basis of the above-mentioned photocatalytic experimental results and characterization, a possible mechanism or pathway was proposed and illustrated. This work can provide a new strategy for the subsequent defect engineering for photocatalytic MOFs materials to further solve environmental and energy crises.
研究领域:
材料科学
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光催化
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环境修复
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能量转换
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纳米技术
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PHYSICAL REVIEW B
·
2026
·Vol. 113
·期 8
·085117
·
IF 3.9
Ruifeng Tian,Jie Chen,Feng Wu,Jiayi Guan,Zhiyan Shao,Wei Wu,Mingwei Ma,Zhiwei Hu,Haoyu Zheng,Pengda Ye,Yuxiang Chen,Hua Zhang,Yanfeng Guo,Meiling Jin,Jiabin Qiao,Fan Yang,Xiang Li
Materials tunable between heavy-fermion metals and antiferromagnetic insulators near quantum criticality are promising candidates for exploring unconventional superconductivity, yet such a behavior is rare in transition metal oxides. Here, we report the high-pressure synthesis and characterization of two Pb-based $A$-site ordered perovskites, ${\mathrm{PbCu}}_{3}{\mathrm{Ru}}_{4}{\mathrm{O}}_{12}$ and ${\mathrm{PbCu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}$, which are characterized as a heavy-fermion metal and an antiferromagnetic insulator, respectively. Systematic $B$-site substitution in ${\mathrm{PbCu}}_{3}{\mathrm{Ru}}_{4\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{12}$ ($x=0\ensuremath{-}4$) reveals a continuous evolution of electronic and magnetic properties, with intermediate compositions exhibiting divergent low-temperature specific heat, indicative of proximity to a quantum critical point. The experimental observation supported by density functional theory calculations reveal that ${\mathrm{PbCu}}_{3}{\mathrm{Ru}}_{4}{\mathrm{O}}_{12}$ exhibits more enhanced effective mass than ${\mathrm{CaCu}}_{3}{\mathrm{Ru}}_{4}{\mathrm{O}}_{12}$, attributed to its enhanced Fermi-level density of states and narrower bandwidth, driven by the elongated Ru-O bonds and the covalent character of ${\mathrm{Pb}}^{2+}$. These results establish ${\mathrm{PbCu}}_{3}{\mathrm{Ru}}_{4\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{12}$ as a rare platform to study quantum criticality and strong correlations in transition-metal oxides and demonstrate that combine $A$-site and $B$-site tuning provides an effective route to tailor electronic and magnetic properties.
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Journal of Water Chemistry and Technology
·
2023
·Vol. 45
·期 2
·164-175
·
IF 0.6
Jing Meng,Geng Cong,Guan Yinyan,Gao Weichun,Ming Hao,Li Dan,Wang Nan,Liu Shiyue,Jiang Wei,Liang Jiyan,Wang Xueying
Abstract The sol-gel approach was utilized to make a copper-doped Ti/SnO 2 -Sb anode for electrochemical oxidation of norfloxacin (NOR). Sycanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), linear scan voltammograms (LSV), and cyclic voltammetry (CV) were used to examine the anode’s surface morphology and electrochemical characteristics. The results show that the doped metal makes the anode coating denser and smoother, which is more conducive to resistance to electrochemical corrosion. The electrochemical degradation of NOR utilizing the constructed anode was examined in relation to reaction circumstances such as current density, pH value, and initial NOR concentration. Within the selected range of reaction conditions, the removal rate of NOR using Ti/SnO 2 –Sb–Cu electrode was significantly higher than that of blank electrode. The following were the shifting trends: NOR removal efficiencies grew with applied current density and initial NOR concentration, and reduced with increasing pH value. Water samples with different reaction times were taken and tested by UV-Vis spectrum. As can be seen from the results, with the progress of the reaction, the intensity of the characteristic peak decreased, indicating that NOR is degraded gradually. The electrochemical degradation pathways of NOR were studied using liquid chromatography coupled with mass spectrometry (LC-MS). Six intermediates were detected and a possible reaction pathway for the degradation of NOR by electrochemical oxidation was proposed.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Wei Wang,Xiangyu Jin,He Huang,Shuang Hu,Can Wu,Hebing Wang,Yiwu Pan,Changqing Hong,Xinghong Zhang
Ablative thermal protection systems are considered to be one of the most promising means of protection for spacecraft re-entry, but challenges remain. Herein, efficient Ti-Si binary modified carbon fiber reinforced phenolic aerogel nanocomposites (C f /TS-PR) were originally designed based on a multi-stage construction strategy. The C f /TS-PR exhibited desirable mechanical strength , good thermal insulation with a minimum thermal conductivity of 0.0756 W/(m·K), remarkable thermal stability and outstanding ablation resistance, benefiting from the features of TiO 2 and the special structure of TiO 2 -SiO 2 coating. The linear ablation rates are as low as 0.004 and 0.003 mm/s at the heat flow of 1.0 and 1.5 MW/m 2 , respectively. The mass loss rates are as low as 0.006 and 0.009 g/s at the heat flow of 1.0 and 1.5 MW/m 2 , respectively. These results indicate that the C f /TS-PR nanocomposites can be a reliable thermal protection material for the future high-temperature service environment of ultra-high-speed vehicles and neutral rockets.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 11
·3517-3525
·
IF 4
Shihui Wang,Zhoujun He,Ling Wu,Deling Wang,Ruiru Si,Xiyao Liu,Ruowen Liang
Due to their explicit structure, metal–organic frameworks (MOFs) have been supposed to be credible platforms to research the micro-mechanism of heterogeneous photocatalysis. In this study, amino-functionalized MOFs (MIL-125(Ti)–NH2 (denoted as MTi), UiO-66(Zr)–NH2 (denoted as UZr) and MIL-68(In)–NH2 (denoted as MIn)) with three different metal centers were synthesized and applied for the denitrification of simulated fuels under visible light irradiation, during which pyridine was used as a typical nitrogen-containing compound. The results showed that MTi had the best activity among the above three MOFs, and the denitrogenation rate increased to 80% after 4 h of visible light irradiation. On the grounds of the theoretical calculation of pyridine adsorption and actual activity experiments, it can be presumed that the unsaturated Ti4+ metal centers should be the key active sites. Meanwhile, the XPS and in situ infrared results verified that the coordinatively unsaturated Ti4+ sites facilitate the activation of pyridine molecules through the surface –N⋯Ti– coordination species. The coordination–photocatalysis synergism promotes the efficiency of photocatalytic performance and the corresponding mechanism is proposed.
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PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 6
·971
·
IF 3.9
Chunjie Shi,Xiaofeng Yu,Wei Wang,Haibing Wu,Ai Zhang,Shengjin Liu
The catalytic activity and cyclic catalysis of different methyl benzoates were studied by using a series of Lewis solid acid catalysts. The iron-supported zirconium/titanium solid acid catalysts were characterized using FTIR, SEM, XRD, and BET. The details of catalytic activity and cyclic catalysis verified that the catalyst catalyzed the reactions of 31 benzoic acids with different substituents and methanol. In addition, the mechanism was revealed according to the microstructure, acid strength, and specific surface area of the catalysts, and the yields of methyl benzoates by the GC-MS. Zr ions had significant effects on the catalytic activity of the catalyst. A certain proportion of Fe and Ti ions additionally enhanced the catalytic activity of the catalyst, with the catalyst-specific composition of Fe:Zr:Ti = 2:1:1 showing optimal catalytic activity. A variety of substituents in the benzene ring, such as the electron-withdrawing group, the electron-donating group, large steric hindrance, and the position of the group on the benzene ring, had regular effects on the catalytic activity of the methyl benzoates. An increase in the catalyst activity occurred owing to the increases in the catalyst surface and the number of acid sites after the Fe ion was added. The catalytic activity remained unchanged after the facile recycling method was performed.Keywords:zirconium/titanium solid acid;iron-supported;methyl benzoate compounds
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AICHE JOURNAL
·
2022
·Vol. 69
·期 5
·e17999
·
IF 4.167
Dong Lin,Yang Xu,Xiuhui Zheng,Wei Sheng,Zhenyi Liu,Yinglong Yan,Yu Cao,Yibin Liu,Xiang Feng,De Chen,Chaohe Yang
Regulating the microenvironment of active sites is crucial to boost the performance of direct propene epoxidation with H 2 and O 2 . Herein, the enhanced surface transfer of H 2 O 2 intermediates was first achieved by sodium-decorated Au-Ti bifunctional active sites. Combined with multi-techniques (e.g., operando UV–vis–NIR system, DFT studies and quantitative model calculations), it is found that the sodium-decorated silanols (Si-ONa species) on the TS-1 support enhance the formation of Ti-OOH intermediates by restraining H 2 O 2 decomposition. In addition, sodium-decorated silanols improves the desorption of propylene oxide, suppressing its ring-opening and formation for the carbonaceous deposits. Moreover, the sodium-decorated Au nanoparticles with smaller diameter and higher electron density further strengthen O 2 adsorption and boost the H 2 O 2 formation. This work not only provides fundamental understandings on the microenvironment of Au-Ti bifunctional catalysts but also sheds new light on enhancing the performance by boosting the surface molecular transfer.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Lijun Guo,Liming Zhao,Yuling Tang,Jianfei Zhou,Bi Shi
Efficient degradation of organic contaminants by oxidative radicals remains a challenge due to invalid consumption of radicals and easy generation of secondary halogenated pollutants. In this work, an efficient and recyclable bimetallic biochar (Cr-Ti/BC) was developed through peroxydisulfate (PDS) activation via nonradical pathway for sulfamethoxazole (SMX) degradation. The Cr-Ti/BC exhibited excellent catalytic activity for 99.9 % of SMX removal with a high k obs of 0.13 min −1 , and negligible inhibitory effects were observed under various pH condition. The activation mechanisms were (i) metastable reactive intermediates (Cr-Ti/BC-PDS) formation via an interaction between Cr-Ti/BC and PDS on the active defective sites (e.g., OH/C O C, COOH, C O, nitric oxides, graphitic N, and pyridinic N), and (ii) 1 O 2 generation through electron transfer between Cr-Ti/BC-PDS intermediates and dissolved oxygen. The high reusability and strong stability of Cr-Ti/BC also verified the outstanding advantage of the Cr-Ti/BC during practical application. This study not only is the first study the catalytic performance of Cr and Ti co-doped biochar for PDS activation, but also successfully provides a promising strategy to induce a nonradical pathway for PDS activation, which is of great significance for the subsequent method design, and thus paving the path for exploiting advanced oxidation systems in practical application for organic contaminant removal toward polluted site remediation.
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高影响因子
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