JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 7
·5566-5572
·
IF 2.324
Wang Ting,Song S. -H.
Sr–Zr co-doped multiferroic BiFeO 3 powders are synthesized using sol–gel technique. The effect of Sr–Zr co-doping on the structural, magnetic and optical properties is investigated. X-ray diffraction demonstrates that the crystal structure transforms and there is no impurity phases present even in a high doping concentration. Scanning electron microscopy and transmission electron microscopy indicate that the Sr–Zr co-doping leads to a decrease in particle size with the Bi 0.80 Sr 0.20 Fe 0.95 Zr 0.05 sample having a particle size of 20–50 nm. With the Sr–Zr co-doping, the nanopowders change to be soft ferromagnetic from antiferromagnetic. The room-temperature remnant magnetization is enhanced by the co-doping, from 0.015 emu/g for the pure BiFeO 3 to 0.237 emu/g for the Bi 0.80 Sr 0.20 Fe 0.95 Zr 0.05 sample. The optical band gap shows an increasing trend with co-doping.
研究领域:
材料科学
·
凝聚态物理
·
纳米材料
·
功能材料
·
多铁材料
✓ 已验证
DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2022
·Vol. 24
·期 12
·124017
·
IF 1.842
Xinluo TIAN,Heping LI,Liyu ZHENG,Fangjian LI,Zhongyang ZHENG,Shengming YIN,Xinyun WANG,Youwei YAN
In this study, a Cr2O3 nanosheet (Cr2O3 NS) inserted Cr-Zr-O coating was developed as a hydrogen isotope permeation barrier. The Cr2O3 NSs, fabricated by rapid heat treatment, were amorphous with a thickness of only several nanometers. These Cr2O3 NSs were then incorporated into a Cr-Zr-O multi-metal oxide composite coating via a dip-coating method to form a coating. The effect of the Cr2O3 NS concentration on the morphology, microstructure and deuterium permeation resistance of the coating was studied. With the addition of 1.0 g l−1 Cr2O3 NSs, compared with the Cr-Zr-O coating without NSs, the permeation reduction factor of the resultant coating was enhanced from 249 °C to 575 °C at 500 °C. The coating, with a thickness of nearly 193 nm, achieved a comparable deuterium resistance that was above two orders of magnitude higher than the steel substrate. The results show that ceramic NSs can serve as effective fillers for enhancing the coating performance when functioning as a hydrogen isotope barrier.
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 33
·14733-14742
·
IF 7.6
Huang Yao-Bing,Wu Peng-Fei,Zhang Bo-Hao,Liu Qun-Xing,Wu Hao,Fei Teng,Lu Qiang
Selective hydrogenation of the conjugated carbon–carbon double bond (C═C) and carbon–oxygen bond (C═O) is an important reaction in organic synthesis, which not only provides access to key intermediates in natural product synthesis but also serves as a probe reaction for the evaluation of catalyst reactivity. However, the higher activation energy of the C═O bond over the C═C bond renders its reduction more challenging. In this work, we report a tailored zirconium (Zr)-doped zeolite catalyst featuring integrated Lewis and Brønsted acid sites for the selective transfer hydrogenation of the C═O bond of cinnamaldehyde (CAL) followed by etherification to yield 1-cinnamyl 2-propyl ether (CPE). A series of Zr catalysts supported on different zeolites were prepared and characterized. Among them, Zr-doped mesoporous SBA-15 (Zr/SBA-15) exhibited the highest reactivity, achieving complete conversion of CAL and 99% yield of CPE at 140 ° C in 7 h. Mechanistic studies revealed that balanced Lewis/Brønsted acid sites were key to the reaction, where Lewis acid sites primarily catalyzed the transfer hydrogenation of CAL to cinnamyl alcohol (COL), while Brønsted acid sites promoted the subsequent esterification of COL to CPE. The current work not only establishes an efficient one-pot approach for the synthesis of allyl ethers from α,β-unsaturated carbonyl compounds but also provides insights into tuning catalyst reactivity through support modification, which would benefit both fundamental research and industrial production.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Liang Chu,Teng Zhao,Zhaokun Wang,Xinyu Zhao,Zhiyong Zhu,Mu Yang,Ge Wang
The development of efficient oxidative desulfurization (ODS) catalysts is of great importance for clean energy. In this study, we report a method for the preparation of defect-enriched UiO-66(Zr) materials via a high-energy ball-milling pretreatment-assisted followed by rapid ethanol crystallization. This method significantly enhances ligand deficiency (46.1 %) and average pore diameter (4.1 nm) without using toxic solvents or pre-synthesized clusters, distinguishing it from conventional solvothermal and one-step mechanochemical approaches. Under the optimal parameters, the resulting UiO-66-BM catalyst exhibits excellent ODS performance, achieving full conversion of dibenzothiophene (DBT, 1000 ppm) within 6 min at 50 °C and 20 min at 30 °C using only 20 mg of catalyst and an O/S molar ratio of 5. The turnover frequency (19.85 h −1 ) and mass specific activity (53 mmol g −1 h −1 ) surpass those of most reported pristine MOFs-based catalysts. Moreover, the catalyst reaction activity maintains high activity over six consecutive cycles, showing excellent stability. The superior performance is attributed to the synergistic effect of ball milling and ethanol crystallization, which generates the enriched structural defects and enlarged mesopores, facilitating mass transfer and active site accessibility. This work presents an effective and eco-friendly strategy for the scalable synthesis of high-performance MOF catalysts for deep desulfurization.
研究领域:
材料科学
·
催化化学
·
环境化学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Hui Liu,Hongyan Li,Bin Lu,Songnan Li,Jingxiang Zhao,Qinghai Cai
A composite catalyst was prepared by impregnation of ZSM-5 in mixture solution of Co(NO 3 ) 2 , ZrOCl 2 and phosphotungstic acid (PW) and characterized by XRD , FT-IR, UV–vis, XPS , SEM and TEM techniques to confirm its structure and composition . The pre-prepared composite is composed of Co 2 (PO 4 )Cl, ZrO 2 , P 2 O 5 and WO 3 crystalline nanoparticles uniformly dispersed on ZSM-5 zeolite . The prepared composite demonstrates effective catalytic function for solvent-free oxidation of toluene into benzaldehyde with H 2 O 2 oxidant, achieving 16.6% conversion and 90% selectivity . The effect of various components composed of the catalyst and reaction conditions on the catalytic function were explored. Moreover, the recovery and reusability of the catalyst were estimated, presenting good reusability.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Li Xu,Peng Chen,Xu Zhang,Dong Liang Lan,Yutao Liu,Weixin Lai,Hamza Shehzad,Limin Zhou,Jinbo Ouyang
Enrofloxacin, as one of the specialized fluoroquinolone antibiotics, has become a typical “emerging” pollutant in aqueous environment because of its great stability and resistance to degradation. Therefore, it is important to find an effective method to remove it from aqueous solution. In order to check the presence of synergies between UiO-66 and MWCNTs on removal of enrofloxacin from aqueous solution, a composite material, known as UiO-66/MWCNTs, was synthesized by using hydrothermal method. The physical and chemical properties of the synthesized composite were characterized by using methods such as XRD, N 2 adsorption–desorption, FT-IR, SEM and XPS. The results revealed that UiO-66/MWCNTs has large specific surface area (837.56 m 2 /g) and high porosity, as well as rich functional groups (C = C, –OH, –COOH). Factors such as contact time, initial concentration, temperature, pH, and ionic strength were considered to test the adsorption performance of pristine MWCNTs, pristine UiO-66 and UiO-66/MWCNTs composite for enrofloxacin. The results showed that the UiO-66/MWCNTs composite has a higher adsorption capacity at basic condition and the maximum adsorption capacities of enrofloxacin on composite was improved from 67.8 mg/g for MWCNTs and 92.8 mg/g for UiO-66 to 134.2 mg/g due to its higher adsorption active sites. The adsorption kinetics studies implied that the adsorption of enrofloxacin onto the studied sorbents involves in physio-chemical interactions and is an intra-particle diffusion controlling process. The isothermal experimental data were compatible with both Langmuir and Freundlich models, suggesting heterogeneous adsorption was the dominant during the course of adsorption. Additionally, the thermodynamic parameters indicated that the adsorption of enrofloxacin on UiO-66/MWCNTs was spontaneous and endothermic in nature. Finally, in combination with XPS analysis, the adsorption mechanism of enrofloxacin on UiO-66/MWCNTs was clarified to be the synergetic effect of chemical adsorption, hydrogen bond and π-π interaction. This work provides a new strategy for the removal of drugs from aqueous environment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Kaiyi Chen,Liang Zhang,Xin Huang,Fuchun Zhang,Gangqiang Zhu,Qizhao Wang
Zr-doped BiVO 4 photoanodes modified with CoF 2 co-catalyst (Zr-CoF 2 /BiVO 4 ) were designed and synthesized by a simple two-step hydrothermal and calcination method. The photocurrent density of the prepared Zr-CoF 2 /BiVO 4 photoanode is as high as about 3.6 mA/cm 2 at 1.23 V vs. RHE (AM 1.5 G). The excellent PEC performance benefits from the cocatalyst loading and the formation of heterojunction . The Zr-CoF 2 /BiVO 4 composite photoanode improves the transfer efficiency of photogenerated carriers and the yield of water splitting. Co 2+ site in the CoF 2 co-catalyst has excellent water oxidation activity. The metal Zr doping further improves charge separation and conduction, thereby reducing the electron-hole complexation rate to affect PEC performance, enhancing photocurrent as well as oxygen release and providing an effective reference method for exploring solar water decomposition. This scheme provides an effective reference method for exploring solar water decomposition.
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2022
·Vol. 4
·期 1
·2200161
·
IF 11.343
Lu Chen,Youbing Li,Ke Chen,Xiaojing Bai,Mian Li,Shiyu Du,Zhifang Chai,Qing Huang
Entropy stabilization is an effective method to design and explore MAX phases with outstanding properties via tuning constituent elements and crystal structures, which have received considerable critical attention. Currently, some medium-/high-entropy (ME/HE) MAX phases, whose A layers are composed of Al, S, and magnetic elements, are reported, while few discussions about ME/HE-MAX phases with other A elements (e.g., Sn) are conducted. Herein, fully dense ME/HE-MAX phase bulks ((TiVNb) 2 SnC, (TiVNbZr) 2 SnC, and (TiVNbZrHf) 2 SnC) are designed and synthesized because of the chemical diversity of MAX phases. The results of Rietveld refinement of X-ray diffraction, scanning electron microscopy, and high-resolution scanning transmission electron microscopy-affiliated energy-dispersive spectrometer analysis comprehensively verify the crystal structure of ME/HE-MAX phases. Both the electrical conductivity and the charge carrier mobility are significantly lower than the reported correlation ternary MAX phases, due to the electron scattering and structural defects in ME/HE-MAX phase crystal structures. Similarly, the electron contribution of thermal conductivity is gradually declining; on the contrary, the phonon plays an increasingly dominant role as temperature increases. Owing to the richness in composition of MAX phases, herein, a composition design route for discovering new MAX phases and tuning their properties is indicated.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yun Long,Jian Sun,Changnian Mo,Xiangyao She,Pengxin Zeng,Hongqiang Xia,Jubing Zhang,Zijian Zhou,Xinming Nie,Chuanwen Zhao
Calcium looping (CaL) belongs to a promising high-temperature CO 2 capture technology because of adopting cheap and extensive source CaO-based sorbents . However, CaO-based sorbents are prone to occur the issues of sintering and elutriation in the fluidized-bed reactors. To further enhance the practicability, the Zr-supported, CaO-based sorbent pellets were produced using the graphite-moulding method. Different synthesis modes (i.e., sol-gel, hydration-mixing, and wet-mixing) were compared for preparing CaO-based composite slurry before pelletization. Sol-gel is the promising synthesis mode to prepare Zr-supported, CaO-based pellets with outstanding CO 2 capture performance due to achieving a more uniform distribution of inert CaZrO 3 spacer. Moreover, the Zr-based stabilizer content within sorbent pellets produced by the combined method of sol-gel and graphite-moulding was further studied. The higher content of Zr-based stabilizer promotes the enhancement of cyclic stability and mechanical strength of Zr-supported, CaO-based pellets. After 17 cycles, the sorbent pellets containing 20 wt% of Zr-based stabilizer display a high CaO carbonation conversion of 74.1 %. Moreover, CaO-based pellets with 20 wt% of Zr-based stabilizer possess a higher compression strength of 4.84 ± 1.08 MPa, which is as high as 1.8 times that of the pellets with 5 wt% of Zr-based stabilizer.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2022
·
IF 4.11
Xinjiang Zhang,Ziqing Chen,Zhaohui Liu,Meng He,Zirun Yang,Jiahui Wang
The in-situ hybrid particle-reinforcements are a novel strengthening mode for the advanced metal matrix composites . In this study, Zr matrix composites incorporating the fixed amount of ZrC particles with the different amounts of Y 2 O 3 particles were prepared by the in-situ reaction among Zr, graphite, Y, and ZrO 2 during the arc-melting. Results revealed that the graphite/Zr reaction produced the uniform in-situ ZrC particles in the Zr matrix, and the Y/ZrO 2 reaction formed the Y 2 O 3 particles. In-situ Y 2 O 3 addition refined the Zr matrix and led to the polygonal morphology of the ZrC particle. The coarser Y 2 O 3 grew in bulk, and some fine Y 2 O 3 dendrites were formed along Zr boundaries. The influence of different contents of Y 2 O 3 reinforcements on the hardness and compressive properties were analyzed. Compared with the single ZrC reinforcements, the hybrid Y 2 O 3 introduction resulted in a higher hardness and enhanced compressive strength . This hybrid structures were believed to be favorable to mechanical responses in the composites, and the relevant mechanisms for the hardening and strengthening effect of such hybrid forms were discussed.
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2022
·
IF 5.572
Ruijuan Lv,Ruimeng Sun,Ting Du,Yuhan Li,Lixia Chen,Yang Zhang,Yanfei Qi
A sensitive electrochemical sensor for sunset yellow (SY) was constructed based on cetyltrimethylammonium bromide (CTAB) functionalized graphene (Gr) and Cu/Zr-MOF electrode modified materials. The CTAB-Gr-Cu/Zr-MOF composites were synthesized by using a mild method and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and EDX spectrum. The combination of Cu/Zr-MOF and graphene exhibited synergetic effect of the strong accumulation efficiency, fast electron transfer rate and more sensing sites towards the oxidation of SY. The new modified materials remarkably increased the electrochemical response of SY to 6.53-fold when comparing with bare electrode. Under the optimized conditions, the oxidation peak currents of SY had a linear relationship with its concentration in a wide range from 0.10 to 8.00 μM and 40.00–1000.00 μM, and the limit of detection was 6.68 nM (S/N = 3). The electrochemical method shows high sensitivity, stability, reproducibility and is successfully applied in the determination of SY in soft drinks.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PLoS One
·
2022
·Vol. 17
·期 8
·e0271075
·
IF 3.752
Bicun Jiang,Fuqiang Liu,Yang Pan,Yan Tan,Chendong Shuang,Aimin Li
Tetracycline (TC) is widely-used antibiotic pollutant with high toxicity, refractory, persistence and bacteriostasis, and its removal from water needs to be enhanced. In this work, a novel Graphite-UiO-66(Zr)/Ti electrode was successfully prepared and evaluated for electrochemical oxidation degradation of TC. The electrochemical performance tests indicate the Graphite-UiO-66(Zr)/Ti electrode had higher electrochemical oxidation activity, which achieved higher TC removal efficiency (98.1% ± 1.5%) than Ti plate (65.2% ± 3.5%), Graphite-MIL-53(Al)/Ti electrode (79.5% ± 2.9%) and Graphite-MIL-100(Fe)/Ti electrode (89.0% ± 2.6%). The influence of operating condition was also systematically studied, and the optimized condition was pH 5.0, 20 mA/cm 2 current density and 0.1 M electrolyte (Na 2 SO 4 ). Through the liquid chromatography mass spectrometry (LC-MS), the TC degradation pathway by Graphite-UiO-66(Zr)/Ti electrode oxidation was proposed. Under the •OH free radical oxidative decomposition effect, the double bond, phenolic group and amine group of TC were attacked. TC was transformed into intermediate product ① (m/z = 447), then was further degraded to intermediates ② (m/z = 401) and ③ (m/z = 417). The latter was fragmented into small fractions ④ (m/z = 194), ⑤but-2-enedioic acid (m/z = 116) and ⑥oxalic acid (m/z = 90, the proposed intermediate). In addition, TC removal remained at 89.6% ± 2.7% in the sixth cycle of operation, which confirmed the efficient reusability and stability for antibiotics removal from water.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）