CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ze Zhu,Xiaoqian Zhang,Ying Peng,Zhenfeng Guo,Yongshuai Xie,Benxue Liu,Guanghui Zhang,Luyi Zhu,Xinqiang Wang,Yonggang Jiang,Jian Feng
Rare earth zirconates have incomparable chemical thermophysical properties , yet the difficulty of preparation methods limit their application as fibrous material. In present work, a spinnable La 2 Zr 2 O 7 precursor, named as carboxylate lanthanum-zirconium (COLZ), was developed using carboxylic acids as structural and functional ligands. When COLZ is in its liquid state, it can be readily processed into desired shapes, allowing preparation of high aspect ratio precursor fibers with dense and bonding-strong internal structures. The spinnability was explained by the transformation from solid to liquid state under external forces, in which dynamic bridging of carboxylate and hydroxyl between nano-sized colloidal particles play a key role. Due to weakly acidic ligands, organics in COLZ can be easily removed, making direct heat treatment at the target temperature possible, which is beneficial for massive production. The strategy of developing spinnable precursor could also be applied to prepare other rare earth zirconate fibers or new multi-oxide fibers.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xin Li,Bangxiang Liu,Kun Ye,Liang Ni,Xuechao Xu,Fengxian Qiu,Jianming Pan,Xiangheng Niu
Due to the role of phosphate (PO 4 3− ) as an indicator of eutrophication pollution, developing low-cost and high-performance approaches to detect it turns to be of great significance. Herein, we developed a highly sensitive and specific colorimetric sensor for PO 4 3− determination via utilizing Zr 4+ to synergistically inhibit the peroxidase-like activity of Fe 3 O 4 nanocubes. The decoration of hydrophilic 3,4-dihydroxyhydrocinnamic acid (DHCA) on Fe 3 O 4 endows it with enhanced ability to catalyze the 3,3′,5,5′-tetramethylbenzidine (TMB) chromogenic reaction. Because of electrostatic interaction, Zr 4+ is easy to be adsorbed onto the negatively charged Fe 3 O 4 -DHCA nanozyme. When PO 4 3− is added, it can interact with Zr 4+ and form a coating on Fe 3 O 4 -DHCA surface, significantly suppressing its peroxidase-mimicking activity. As a result, the TMB chromogenic reaction is seriously inhibited in the presence of PO 4 3− . Based on this strategy, PO 4 3− in the wide scope of 0.066–33.3 μM could be linearly determined, providing a detection limit down to 49.8 nM. Thanks to the strong and specific interaction between Zr 4+ and PO 4 3− , the colorimetric sensor could be employed to detect PO 4 3− with favorable selectivity. Reliable analysis of the target in practical water was also verified by our assay, indicating its great potential as a simple but efficient tool for environmental monitoring.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Chao Yang,Hao Chen,Yuankai Li,Zhelin Su,Yeshuang Wang,Xufei Liu,Huiling Fan
The low sulfur selectivity of Fe-based H2S-selective catalytic oxidation catalysts is still a problem, especially at a high O2 content. This is alleviated here through anchoring FeOx nanoclusters on UiO-66 via the formation of Fe–O–Zr bonds. The introduced FeOx species exist in the form of FeIII and FeII. Therein the FeIII–O species are the predominant active sites for H2S-oxidation. The formed Fe–O–Zr bonds strengthen the redox cycle of FeIII/FeII through promoting electron transfer from Fe to Zr. The FeII–O species can activate molecular oxygen to oxidize H2S into elemental S, which accelerates the formation rate of atomic S, hindering its further oxidation into SO2. The combination of these factors empowers the catalysts, enabling 100% H2S conversion and 98.2% sulfur yield. The catalyst also has satisfactory stability with the sulfur selectivity only decreasing from 98.2% to 91.3% after the reaction going on 50 h. The decreased sulfur selectivity might be caused by the deterioration of pores and the deposition of elemental S on the surface. The former hinders the diffusion of sulfur oligomers timely from pores to the gas phase, while the latter is suspected to capture electrons to promote its further reaction with molecular oxygen.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Zhen Wu,Jinlong Wang,Xing Cheng,Yue Tang,Lian Xia,Xiaojuan Niu,Yuangen Wu
Nanozyme-based sensors for detecting ascorbic acid (AA) generally depend on the reducibility of the analyte. However, these sensors are susceptible to interference from reducing substances in food. Herein, a novel fluorescent sensor for AA detection was developed based on inhibiting the phosphatase-like activity of a Zr-based metal-organic framework (Zr-CAU-28). Hydroxyl-rich AA molecules adsorb on the surface of Zr-CAU-28 through hydrogen bonding with [Zr 6 O 4 (OH) 4 ] cluster, leading to a decrease in the relative content of terminal hydroxyl groups within the catalytic sites. The constructed sensor exhibits a wide detection range (0.08–11 μg·mL −1 ) and low detection limit of 0.025 μg·mL −1 . Potential interfering studies demonstrated the good selectivity of the sensor. Moreover, the fluorescent sensor can effectively detect AA in juices and vitamin C tablets, with the recovery rate ranging from 96.25 % to 108.50 %. This work represents the first application of phosphatase mimics for AA detection, offering a new strategy for food analysis.
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FUEL
·
2016
·
IF 3.611
Zhenhuan Xiao,Huacong Zhou,Jianmin Hao,Hailong Hong,Yinmin Song,Runxia He,Keduan Zhi,Quansheng Liu
As the fast depletion of coal resources, exploring the value-added utilization approaches of low rank coals or their components and, in parallel, promoting the conversion of sustainable resources (such as biomass) into useful chemicals are critical issues facing human society. In this work, we used humic acids (HAs), an abundant material in nature (mainly derived from low rank coals), and the transition metal zirconium (Zr) to prepare a novel Zr-containing hydrogen transfer catalyst. The prepared catalyst was applied into the conversion of biomass-derived ethyl levulinate (EL) into gamma-valerolactone (GVL) via hydrogen transfer reaction. Both the preparation conditions of the catalysts and the reaction parameters during the conversion of EL into GVL were systematically investigated. The catalyst was characterized by SEM, TEM, FTIR, powder XRD, and TG analysis. The results demonstrated that the as-prepared catalyst was highly efficient for the conversion of EL into GVL. Under optimized conditions, EL could be completely converted and the GVL yield could reach up to 88.3%. The catalyst could be used at least 11 times without notable changes in both activity and structures, indicating an excellent stability. As far as we know, this is the first work using HAs to prepare Zr-containing catalyst and its application to the conversion of EL into GVL in biomass utilization.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2013
·Vol. 19
·期 42
·14279-14285
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IF 5.831
Dengrong Sun,Yanghe Fu,Wenjun Liu,Lin Ye,Dengke Wang,Lin Yang,Xianzhi Fu,Zhaohui Li
Graphical Higher CO 2 photoreduction activity than previously studied metal–organic framework (MOF) NH 2 -MIL-125(Ti) in the presence of triethanolamine (TEOA) as the sacrificial agent under visible light is exhibited by the amino-functionalized MOF NH 2 -Uio-66(Zr). The photoinduced electron transfer from 2-aminoterephthalate linkers to Zr oxo clusters was revealed for the first time by photoluminescence studies, and the generated Zr III was detected by ESR analysis (see figure). Metal–organic framework (MOF) NH 2 -Uio-66(Zr) exhibits photocatalytic activity for CO 2 reduction in the presence of triethanolamine as sacrificial agent under visible-light irradiation. Photoinduced electron transfer from the excited 2-aminoterephthalate (ATA) to Zr oxo clusters in NH 2 -Uio-66(Zr) was for the first time revealed by photoluminescence studies. Generation of Zr III and its involvement in photocatalytic CO 2 reduction was confirmed by ESR analysis. Moreover, NH 2 -Uio-66(Zr) with mixed ATA and 2,5-diaminoterephthalate (DTA) ligands was prepared and shown to exhibit higher performance for photocatalytic CO 2 reduction due to its enhanced light adsorption and increased adsorption of CO 2 . This study provides a better understanding of photocatalytic CO 2 reduction over MOF-based photocatalysts and also demonstrates the great potential of using MOFs as highly stable, molecularly tunable, and recyclable photocatalysts in CO 2 reduction.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xing Cheng,Yue Tang,Xiaohuan Huang,Linghui Huang,Han Tao,Yuangen Wu
Artificial enzymes have attracted much attention in food analysis because of their simple preparation, low cost, and strong stability. However, the most used artificial enzymes are based on oxidoreductases such as oxidase, peroxidase, catalase, and laccase. There are few reports on hydrolases like phosphatase for food analysis. Herein, a novel green zirconium-glutamic acid (Zr(IV)-Glu) complex was prepared using Zr ions and glutamic acid. The Zr(IV)-Glu complex was first found to possess excellent phosphatase-like activity, which was used to establish a fluorescent sensor for detecting phytic acid (PA). The Zr(IV)-Glu complex can catalyze the hydrolysis of 4-methylumbellione phosphate disodium salt (4-MUP) to produce blue fluorescent products with fluorescence emission peaks at 448 nm. PA with six phosphate groups can attach on the surface of Zr(IV)-Glu to form Zr-O-P bond and inhibit the catalytic activity of Zr(IV)-Glu, leading to the decrease of fluorescence in the system. The change of fluorescent intensity at 448 nm was positively correlated with the PA content, so that a fluorescent sensor using the phosphatase-like activity of Zr(IV)-Glu was proposed to detect PA. The established sensor has high sensitivity, low detection limit (LOD) of PA to 58 μg·L -1 , strong anti-interference ability, and excellent selectivity. This work can provide a new method for PA detection in food and further expand the application of phosphatase mimics.
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Metals
·
2025
·Vol. 15
·期 3
·307
·
IF 2.5
Ziyang Ruan,Zifan Zhao,Jing Feng
Rare-earth tantalates (RETaO4) are considered as a type of emerging thermal barrier coating materials applied to the hot components of gas turbines and aerospace engines due to their excellent thermal stability, high-temperature fracture toughness, corrosion resistance and extremely low thermal conductivity. However, the relatively low hardness and thermal expansion coefficients may limit their service lifetime in a harsh engine environment. To address the current limitation of rare-earth tantalates and further optimize the mechanical and thermal properties, the defective fluorite-structured Y₂Zr₂O₇ (YZ) was introduced as a second phase into the YTaO4(YT) matrix to form YT1−x–YZx(x = 0, 0.25, 0.5, 0.75, 1) composite ceramics in this work. The mechanical and thermal properties of YT1−x–YZxcomposite ceramics are significantly improved compared to pure-phase YTaO4ceramics. The Vickers hardness of YT1−x–YZx(x = 0.25, 0.5, 0.75) composite ceramics is 9.1~11.3 GPa, which are 2~2.5 times higher than that of YTaO4(4.5 GPa). Among them, YT0.75–YZ0.25exhibits a maximum fracture toughness (3.7 ± 0.5 MPa·m1/2), achieving a 23% improvement compared to YTaO4(3.0 ± 0.23 MPa·m1/2) and a 118% improvement compared to Y2Zr2O7(1.73 ± 0.28 MPa·m1/2). The enhancement is attributed to the combined effect of the intrinsic strengthening of the second phase, as well as the residual stress and grain refinement caused by the introduction of a second phase. Additionally, the thermal expansion coefficients of YT1−x–YZxcomposite ceramics at 1673 K range from 10.3 × 10⁻⁶ K⁻1to 11.0 × 10⁻⁶ K⁻1, which is also higher than that of YTaO4(10.0 × 10−6K−1). Consequently, the superior mechanical and thermal properties indicate that YT–YZ composite ceramics possess promising application prospects for thermal barrier coatings.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 10
·5875-5884
·
IF 10.7
Hui Guo,Yifeng Li,Lulu Jiang,Yenan Sha,Shihang Guo,Donglin Han
Proton conducting oxides are attracting increasing attention due to their promising application as electrolytes in solid-state electrochemical devices for energy conversion and chemical production, including protonic ceramic fuel cells, electrolyzers and membrane reactors. BaZrO3 and Ba(Zr,Ce)O3 substituted by acceptor dopants are currently the most promising proton conductors. In principle, replacing Zr or Ce with one kind of trivalent element (e.g., Y or Yb) can generate oxygen vacancies, which are necessary for the hydration reaction to introduce charge carriers of protons. However, it is commonly recognized that substituting Zr or Ce with Y and Yb simultaneously leads to high performance of the devices, but the reason is not clear. In this work, we studied the transport properties of four different compositional classes: BaZr0.8−xCexY0.2O3−δ (BZCY20), BaZr0.8Y0.2−xYbxO3−δ (BZYYb), BaZr0.1Ce0.7Y0.2−xYbxO3−δ (BZCYYb) and BaCe0.8Y0.2−xYbxO3−δ (BCYYb), at 600, 650 and 700 °C. For BZCY20, the ionic conductivity decreases on replacing Zr in BZY20 with x = 0.1 of Ce, increases with increasing Ce content within x = 0.1–0.5, and decreases on further increasing Ce content from x = 0.5 to 0.8. The ionic transport number increases with increasing Ce content. The ionic conductivity, partial conductivity of oxide ions and hole conductivity of BZCYYb and BCYYb increase with increasing Yb content. Since the increment of hole conductivity is larger, the ionic transport number decreases. For BZYYb, the ionic conductivity decreases and the hole conductivity increases with increasing Yb content, leading to decreasing ionic transport number. Both the high ionic conductivity and transport number are vital factors governing the performance of protonic ceramic cells (PCCs). Therefore, the improved performance of PCCs by adding both Y and Yb into the electrolyte cannot be explained from the viewpoint of electrical properties of the electrolytes. Thereby, we summarized our recent series of studies on the chemical compatibility between the electrolyte and NiO negatrode substrate, and suggested that the loss of dopant was suppressed by partly replacing Y with Yb. The high ionic conduction of the electrolyte can be maintained after co-sintering at high temperature to fabricate PCCs. This might be the real reason for the high performance of the devices using Y and Yb co-substituted electrolytes, prepared by the co-sintering method.
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ELECTROPHORESIS
·
2024
·
IF 3
Jiao Long,Yan Gao,Kangjia Sheng,Tao Bao,Sicen Wang
In this study, an efficient and practical method was established to enrich and detect three trace quinolones in fish tissue. Low-cost and environment-friendly cotton threads were coated with PCN-224 using a simple one-pot hydrothermal method. The PCN-224-modified cotton threads (PCN-224@CTs) were characterized to ensure that the crystal was successfully fabricated on the surface of cotton threads. The prepared PCN-224@CTs were wrapped around steel needles to form suspended bars. Key factors of extraction and desorption were optimized, and analytical performance was tested. Suspended bar sorptive extraction coupled with ultra-performance liquid chromatography (UPLC) with a photodiode array detector was used to analyze the quinolones in fish tissue. The detection limits of quinolones were 0.26–1.15 ng/mL, and the recoveries were achieved in the range of 81.31%–115.81%, indicating a simple method with high sensitivity and satisfactory practicability of enriching, separating, and detecting trace quinolones was successfully established.
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Materials Today Communications
·
2025
·
IF 4.5
Xiaojing Liu,Chonghe Xu,Lin Wang,Rongchao Jiang,Liguang Yang,Wenyu Yang,Xuetao Yue
Ceramic fibers have emerged as a promising candidate for advanced thermal insulation applications due to their exceptional thermomechanical properties and chemical resistance. In this work, Mg(-Al/Zr)-Si ceramic fibers were successfully prepared via electrospinning technology using a dual-source precursor strategy, combining magnesium citrate complex and metal chlorides as metal oxides precursors. The crystalline phase formation, thermal decomposition behavior, microstructure, and properties of the fibers were systematically investigated using X-ray diffraction (XRD), thermogravimetric-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FT–IR), and scanning electron microscopy (SEM). The heterogeneous sol precursor notably influenced the fiber crystallization process and facilitated more gradual thermal decomposition, as evidenced by reduced weight loss rates. Consequently, the Mg(-Al/Zr)-Si ceramic fibers maintained good structural integrity after exposure to 1200 °C. Moreover, the incorporation of aluminum or zirconium enhanced the tensile strengths of fibers (heat treated at 800 °C) to 1.56–1.79 MPa, representing a significant improvement over pure magnesium silicate fibers. Furthermore, the fibers exhibited good thermal insulation performance with low room-temperature thermal conductivity values ranging from 0.0282 to 0.0333 W·m −1 ·K −1 , further highlighting their suitability for high-temperature insulation applications. These findings underscore the significant potential of the developed fibers for use in high temperature thermal management and insulation systems.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qinzhi Wang,Yijian Zhao,Zhan Shi,Xinyu Sun,Tong Bu,Changqiu Zhang,Zexiang Mao,Xiaohan Li,Li Wang
Azo dyes in soft drinks present a serious risk to human health and are strictly limited in many countries. Herein, we demonstrate that covalent-organic framework (COF) can be facilely grown on magnetic metal–organic framework (MOF) to form three kinds of porous Fe 3 O 4 @MOF(M = Fe, Ti, Zr)@COFs composites for efficient azo dyes adsorption. Adsorption performances of Fe 3 O 4 @MOF(M = Fe, Ti, Zr)@COFs toward azo dyes were systemically investigated by adsorption kinetics , adsorption isotherms and adsorption thermodynamics. Under optimized conditions, the maximum adsorption capacities of both Fe 3 O 4 @MOF(Fe)@COF and Fe 3 O 4 @MOF(Zr)@COF for Congo red (CR) are 1250.02 and 625.13 mg g −1 , and the Fe 3 O 4 @MOF(Ti)@COF for Chrysoidine (CYD) is 294.12 mg g −1 , all which are higher than those of mostly previous reports. Furthermore, possible mechanisms of adsorption were revealed through Fourier-transform infrared spectra and X-ray photoelectron spectroscopy analysis. These Fe 3 O 4 @MOF(M = Fe, Ti, Zr)@COFs composites also present good biocompatibility, and exhibit high adsorption capacities for CR or CYD in soft drinks, which can be suggested as effective adsorbents for the azo dyes removal from soft drinks.
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危险品化学品经营许可证（带存储）