CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yaqi Qu,Hualiang An,Xinqiang Zhao,Yanji Wang
High dispersion of active metal is an inevitable requirement to improve the catalytic performance of supported metal catalysts and achieving this goal always requires the support with a large specific surface area. Here we innovatively prepared a ZrO 2 @Pt catalyst using ZrO 2 with a small specific surface area as the core which is coated with highly dispersed Pt nanoclusters (<2 nm). In this process, the surface of ZrO 2 was firstly functionalized to increase the number of hydroxyl group, Pt nanoclusters were formed simultaneously and uniformly coated on the ZrO 2 surface. In this work, much attention was paid to the role of 2-[4-(2-hydroxyethyl)-1-piperazinyl] ethanesulfonic acid (HEPES) and ethanol in the one-pot preparation process. The results showed that HEPES acted as a reductant, while treatment with ethanol promoted both the generation of hydroxyl groups on ZrO 2 surface and the reduction of Pt precursor under mild conditions. As-prepared ZrO 2 @Pt catalyst showed excellent catalytic performance in the selective hydrogenation of nitrobenzene; nitrobenzene was completely converted to aniline with 100 % selectivity at room temperature and 8 bar H 2 pressure within 30 min, and the TOF reached as high as 3304 h −1 . Moreover, ZrO 2 @Pt also exhibited a good reusability and a broad substrate applicability. The results of both DRIFTS analysis and DFT calculation demonstrated that the hydrogenation of nitrobenzene on ZrO 2 @Pt catalyst followed the condensation reaction pathway. Our findings can provide a new approach to obtaining highly dispersed metal nanoparticles on the support with a small specific surface area.
研究领域:
催化
·
材料科学
·
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 48
·期 3
·3081-3095
·
IF 4.527
Mingchao Wang,Zhaoli Chen,Jingxuan Liu,Zhaojie Feng,Jingfang Zhang,Wenzheng Zhai,Haijun Zhang
To meet the high demand for ceramic/superalloy composite structural components in various fields, an advanced high-temperature adhesion technique was firstly developed by preparing a novel inorganic/organic hybrid adhesive suitable for ZrO 2 and TC4 . Chemical bonding started to work at ∼600°C, and became the crucial bonding mechanism at elevated temperatures. The formation of ZrSiO 4 and Ti 5 Si 3 at the interfaces of two substrates not only increased the interfacial connection strength , but also formed two gradient layers with a size of ∼2 μm to effectively alleviate the difference of composition and performance between the adhesive and substrates. In the temperature range of 500–900°C, the matching degree of CTE among ZrO 2 , adhesive and TC4 is higher, and the maximum difference does not exceed 3×10 -6 K -1 . Meanwhile, the formation of a composite structure containing various ceramics (ZrO 2 , SiC and ZrB 2 ) and intermetallics (Ni–Si, Al–Ni), and the improvement of structural compactness of adhesive from 500 to 900°C greatly improved the bonding strength to the maximum value of 31.4 MPa at 900°C. Also, the adhesive pretreated at 900°C showed good thermal cycling resistance, and the strength was still higher than 15 MPa after 50 cycles. For cured adhesive, when used directly in an extreme environment, it can provide bonding strength not less than 5 MPa in the whole temperature range, indicating that the adhesive possessed potential emergency repair convenience. This work significantly broadened the application of high-temperature-resistant adhesion technology in the connection of dissimilar ceramics and alloys.
研究领域:
材料科学
·
复合材料
·
界面工程
·
高温功能材料
·
连接技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Tian Tao,Yang Zhou,Mingyu Ma,Hanping He,Nan Gao,Zhiwei Cai,Gang Chang,Yunbin He
A novel graphene electrochemical transistor (GECT) based on zirconia/reduced graphene oxide (ZrO 2 /rGO) nanocomposites functionalized gate electrode and graphene as channel was successfully designed and fabricated for highly sensitive detection of methyl parathion (MP). ZrO 2 /rGO nanocomposites were co-electrodeposited on a glassy carbon electrode considering the special affinity of ZrO 2 toward phosphate groups and high specific surface area of rGO. The sensing mechanism is attributed to the change of effective gate voltage applied to GECT induced by the electrochemical reactions of MP at the functionalized gate electrode, thus tuning the channel carrier concentration and the channel current. Due to the excellent electrocatalytic activity of ZrO 2 /rGO on the gate and the high carrier mobility of graphene in the channel, the developed sensor exhibited excellent sensing performances with ultra-low detection limit (10 pg/mL) and ultra-wide linear range from 10 pg/mL to 10 μg/mL, which especially stand out of the reported devices. The GECT sensor also showed good selectivity toward usual interferents and strong practicality through testing MP in Chinese cabbage samples. The developed GECT devices provided not only the novel platform for pesticide detection with high sensitivity but the new method of enhancing the sensing performance through specifically functionalized gate electrode.
研究领域:
电化学
·
纳米技术
·
传感器
·
农药检测
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhanfeng Li,Xibin Yi,Jia Liu,Luyi Zhu,Ruixiang Liu,Benxue Liu
The configurations of the embedded fibers within aerogel composites influence the mechanical and thermal performances significantly, rendering the composites suitable for harsh conditions. With this regard, quartz fiber preforms were designed by carding quartz fibers wool, then layer-by-layer stacking in a space-confined mold, where the fibers were pre-compressed, resulting in spring-back behavior that opposes the direction of compression. ZrO 2 -SiO 2 aerogel precursor was infiltrated into the fiber preform to form quartz fiber reinforced ZrO 2 -SiO 2 aerogel (QFZSA) composites with the assistance of vacuum impregnation, sol-gel chemistry and supercritical drying. Thanks to the spring back effect of the fiber preform, the QFZSA composite exhibits exceptional out-plane mechanical strengths; compressive and bending strengths both reached nearly 1 MPa. In addition, the layer stacking structure of the fiber preforms efficiently suppressed conductive heat transfer as well as radiative heat transfer, endowing ultra-low thermal conductivities of 0.036 W m -1 K -1 and 0.070 W m -1 K -1 at 1000 ºC and 1200 ºC, respectively. The densities of the QFZSA composites with varying fiber volume fractions were in the range of 0.16-0.24 g cm -3 . X-ray computed tomography provided comprehensive characterization of the QFZSA composites, including fiber configuration, fiber volume fraction, interfacial area, and defect volume fraction, among others, which are important parameters governing composite properties. The as-prepared QFZSA composites are capable of finding applications in many leading-edge thermal protection fields.
研究领域:
材料科学
·
航空工程
·
热工学
·
复合材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
M.M. Mikhailov,V.V. Neshchimenko,Chundong Li
This study carried out on the diffuse reflective spectra of zinc oxide modified by Al 2 O 3 , ZrO 2 , SiO 2 , CeO 2 , TiO 2 and Y 2 O 3 nanoparticles . It was established that during the modification are formed the solid solutions between zinc oxide and nanopowder as Al 2 ZnO 4 , ZrZnO 3 , Zn 2 SiO 4 , Ce x Zn (1−х) О y , Zn 2 TiO 4 , Y x Zn (1−x) O y . The diffuse reflection spectra of the modified powders are changed in the UV and visible range with a maximum at 395 nm. This band is determined by the intrinsic point defects in the crystal lattice of ZnO as interstitial zinc ions and zinc vacancy. In the IR region also recorded changes due to the absorption of OH-groups adsorbed on the surface modified zinc oxide.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ying Xu,Genkuo Nie,Xiao Jiang,Hongyu Wang,Guihua Yang,Ziyi Yan,Ji-Jun Zou,Hailong Yu,Shitao Yu,Yu Liu
Metal-metal oxide catalysts are robust in selective hydrodeoxygenation of biomass derives. Herein, 1-hexanol in total yield about 76 % is firstly achieved by high selective hydrodeoxygenation of 5-hydroxymethylfurfural over Ni/MCM-41 and Pt-WO X /t-ZrO 2 . By controlling the amount ratio of Ni/Ni 2+ to 0.46, a 99.9 % yield of 2,5-tetrahydrofurandimethanol was achieved from 5-hydroxymethylfurfural by Ni/MCM-41. Subsequently high yield of 76 % of 1-hexanol was obtained by competing pathways of tandem reactions beginning at SN2 reaction at the epoxy atom of 2,5-tetrahydrofurandimethanol to enol/tautomer intermediates and ending with controllable selective hydrogenation. The reaction mechanism is explored and the reaction-oriented regulation is realized by the additional strong BrÖnsted acid sites generated by electron transfer from W to Pt and the appropriate amount of Pt 0 sites of Pt-WO X /t-ZrO 2 , where the ratios of W 5+ /W 6+ and Pt 0 /Pt 2+ are 0.31 and 4.58 respectively. This work provides a new and green method for the synthesis of 1-hexanol and expands the utilization of metal–metal oxide in making value-added products using sustainable feedstocks.
研究领域:
催化
·
化学工程
·
绿色化学
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ziyan Hu,Zhongbing Huang,Juan Wang,Jirui Wen,Ximing Pu,Qianlei Lang,Peng Yang,Zhongxiang Shao,Jia Hu,Jiang Wu,Guangfu Yin
Typical symptoms of acute myocardial infarction (AMI) and acute aortic dissection (AAD) are similar chest pain, leading to higher clinical misdiagnosis rate, evenly the mortality rate of patients. In this work, ZrO 2 @PEI-QDs nanospheres with higher fluorescence were prepared by sequential electrostatic adsorption of branched PEI chains and CdSe/ZnS-COOH QDs on hollow ZrO 2 nanospheres. Three multi-channel LFIA strips (on sST2 and cTnI, cTnI and h-FABP, HMGB1 and sST2, respectively) based on ZrO 2 @PEI-QDs for rapid and correct distinguishing of AMI and ADD were constructed. Their visual limit of detection (vLOD for sST2 and cTnI, cTnI and h-FABP, HMGB1 and sST2) within 10–15 min reached 0.075 and 0.1 ng/mL, 0.1 and 1 ng/mL, 1 and 0.1 ng/mL, respectively, which were all lower than the normal level of healthy people. Compared with previous studies, ZrO 2 surface adsorbs more QDs, the fluorescence intensity was increased by about 2.84 times, and vLODs of three strips based on the quantitative fluorescence analysis were also increased by up to one orders of magnitude. The test results of five clinical serum samples indicated that three multi-channel LFIA strips could quantitatively detect four biomarkers of chest pain, and successfully distinguish AMI patients from AAD patients. These results indicated that this set of multi-channel LFIA strips could become an effective tool for the early and accurate detection or distinguish of ADD and AMI.
研究领域:
纳米技术
·
生物传感器
·
医学诊断
·
心脏病学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xiangzhan Meng,Yongqiang Zhang,Zengxi Li,Hui Wang,Suojiang Zhang
Au supported on monoclinic ZrO2 (Au/m-ZrO2) prepared by deposition–precipitation method showed excellent catalytic performance in the aerobic oxidation of amino alcohols to amino acids, i.e., glycine, alanine, serine, β-alanine, and 2-aminobutyric acid. The Au particle size and valence distribution of the gold species were adjusted by calcination temperature, as demonstrated by XRD, TEM, UV–vis DRS, XPS, and H2-TPR, which significantly influenced the catalytic activity but not the selectivity of amino acids. Metallic gold atoms on the surface were shown to be the active sites by the correlation between reaction rate per mole of metallic Au and Au particle size. The kinetics of oxidation of monoethanolamine (MEA) was studied in detail, and the results indicated that MEA oxidation is a first-order reaction with an activation energy of 52.8 kJ·mol–1.
研究领域:
催化
·
化学工程
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Wenjing Lu,Chunhui Zhang,Yanxin Li,Zhaowei Qin,Xuezhi Li,Yiyun Li,Kefeng Zhang
Fluoride ion pollution in water has become a serious threat to the water environment and human health. Adsorption is a promising means of fluoride removal, but it also faces challenges such as the difficult separation and recovery of powdered particles, the leaching of modified coatings from adsorbents, and the structural disintegration of macroscopic adsorbents. For addressing the above challenges, glutaraldehyde/polyvinyl alcohol co-crosslinked ZrSAF/chitosan spongy composites (ZrS/GPCS) were prepared by utilizing encapsulation strategies and cross-linking. ZrS/GPCS-1, ZrS/GPCS-3 and ZrS/GPCS-4 were prepared due to the different amounts of cross-linking agents. The results showed that their fluoride ion adsorption capacities were 42.02, 44.44 and 39.84 mg/g, respectively. The removal of fluoride ions by ZrS/GPCS was maintained at >80 % in the pH range of 4–10. The addition of glutaraldehyde and polyvinyl alcohol affected the contact efficiency of fluoride ions with chitosan and ZrSAF, influencing the adsorption rate and adsorption effect. Glutaraldehyde, polyvinyl alcohol and ZrSAF improved the thermal stability, mechanical properties and structural integrity of chitosan matrix. Both the chitosan matrix and the internal ZrSAF played an important role in fluoride removal, and the removal mechanisms included electrostatic interaction, hydrogen bonding, and complexation.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yongde Ma,Yanru Wang,Wenquan Wu,Jiayin Zhang,Yanning Cao,Kuan Huang,Lilong Jiang
Slurry-phase hydrocracking is one of the most advanced technologies for the conversion of inferior heavy oil to light fuel oil. In this work, MoS2 was combined with SiO2–ZrO2 mixed oxides to offer a new class of bifunctional catalysts for slurry-phase hydrocracking. In the bifunctional catalysts, SiO2–ZrO2 mixed oxides with abundant mesopores and acid sites act as cracking catalysts. They were presynthesized by a sol–gel-hydrothermal method and systematically characterized by X-ray diffraction (XRD), N2 adsorption, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), NH3-temperature programed desorption (NH3-TPD), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The effect of Si/Zr molar ratios on the chemical structure, especially the acid properties of SiO2–ZrO2 mixed oxides were examined. Subsequently, a mixture of decalin–phenanthrene was selected as the model system to investigate the performance of bifunctional catalysts. It was found that the conversions of decalin and phenanthrene were significantly improved for MoS2/SiO2–ZrO2 bifunctional catalysts. Further analysis indicated that the Brønsted acid sites of SiO2–ZrO2 mixed oxides played an important role in the improvement of decalin and phenanthrene conversions.
研究领域:
化学工程
·
催化
·
石油炼制
✓ 已验证
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Shuo Li,Sheng Lei,Qian Yu,Lina Zou,Baoxian Ye
A novel high-sensitive electrochemical sensor with glassy carbon electrode (GCE) as support for hyperin determination is successfully designed and constructed, and the well-shaped nano-meter modified material is synthesized via a one-step and facile route. Functionalized with surfactant sodium dodecyl sulfate (SDS), Single-Walled Carbon Nanotubes (SWCNTs) are synchronously grafted with ZrO 2 nanoparticles to develop into the as-prepared nano-composite (ZrO 2 -SDS-SWCNTs). Compared to the previous reports related with hyperin detection, the linear range gets wider and detection limit (LOD) becomes lower with the aid of this novel nano-composite modified glassy carbon electrode (ZrO 2 -SDS-SWCNTs/GCE). The crystalline phases and functionalization of the preparation process has been investigated by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) instrument analysis, respectively, and the micro-morphology of related modified materials is also visibly characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). In addition, electrochemical properties of the modified materials are comparably explored by means of impedance spectroscopy (EIS) and cyclic voltammograms (CV). According to the established calibration curve under optimized condition, the peak current (Differential pulse voltammetry (DPV) signal) keeps a linear relationship with hyperin concentration in the ranges of 1.0 × 10 −9 − 3.0 × 10 −7 mol L −1 , meanwhile detection limit reaches as low as 5 × 10 −10 mol L −1 (S/N = 3). As for practical applications, the proposed sensor has also worked well on sensitive hyperin determination in real species Abelmoschus manihot.
研究领域:
分析化学
·
纳米技术
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Yan Gao,Yiwei Zhang,Yuming Zhou,Chao Zhang,Hongxing Zhang,Shuo Zhao,Jiasheng Fang,Mengqiu Huang,Xiaoli Sheng
In this work, we report a feasible approach to synthesize a ternary nanocomposites , Pt/lanthanum doped mesoporous zirconium oxide (Pt/La 2 O 3 -ZrO 2 ), via an effective two-step method. Ordered mesoporous La 2 O 3 -ZrO 2 composites were firstly fabricated with mesoporous silica KIT-6 as a hard template. Subsequently, uniform Pt nanoparticles encapsulated by 4 hydroxyl-terminated poly (amidoamine) (G4-OH PAMAM) dendrimers were deposited on the La 2 O 3 -ZrO 2 composites. The as-prepared samples were characterized by transmission electron microscope (TEM), N 2 adsorption–desorption isotherm analysis, energy dispersion X-ray analysis (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature programmed reduction (H 2 -TPR). The average size of PtDENs was found to be 1.48 nm in diameter. Furthermore, the introduction of La could improve the structure of the supports which was confirmed by XRD and H 2 -TPR analysis. The reduction of p-nitrophenol to p-aminophenol by NaBH 4 was utilized to evaluate the catalytic performances of catalysts. Results indicated that the Pt/La 2 O 3 -ZrO 2 catalyst calcined in nitrogen at 550 °C exhibited the highest catalytic performance and still kept the high catalytic activity even after six cycles. This phenomenon suggests that synergistic effect among Pt-Zr-La could enhance the catalytic efficiency. Finally, reaction mechanism was proposed for the reduction of p-nitrophenol.
研究领域:
材料科学
·
催化
·
纳米技术
·
化学工程
✓ 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）