JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 3
·1414-1424
·
IF 2.956
Yaowu Wei,Tao Zhang,Qi Zhang,Bingqiang Han,Nan Li
Improving the hydration resistance of CaO aggregates is the key to successful application of lime-based refractories in metallurgical industry. Additive Zr(OH) 4 and Al(OH) 3 were introduced in the preparation of CaO granules using granulation equipment and calcination method in this study. The results showed that the hydration resistance of CaO granules was improved significantly, especially for granules with 0.6 wt.% Zr(OH) 4 and 0.9 wt.% Al(OH) 3 , respectively. The shell of CaO granules was relatively dense after calcination and the volume of open pores of CaO granules decreased from 3.56 × 10 −2 to 1.80 × 10 −2 cm 3 /g when additive was introduced. Zr(OH) 4 and Al(OH) 3 have the opposite effect on the closed porosity of CaO granules, the closed porosity of CaO granules was decreased with Zr(OH) 4 addition, but increased with Al(OH) 3 addition.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Tao Wu,Jingwei Wan,Xuebing Ma
Magnetic solid acid catalysts SO 4 2− /Zr(OH) 4 –Fe 3 O 4 were prepared using magnetic Fe 3 O 4 nanoparticles , ZrOCl 2 ·8H 2 O, and sulfuric acid as starting materials in the calcination temperature range 110–650 °C. The properties of the magnetic solid acid, such as loaded SO 4 2− content, acid distribution, surface morphology, and porous structure, were characterized. In the aqueous asymmetric aldol reaction of various benzaldehydes with strong electron-withdrawing groups (R = NO 2 and CN), good to excellent catalytic performance (83%–100% yield, 86.0%–95.6% ee anti , and anti/syn = 88–96/12–4) was achieved. These nanomagnetic solid acids can be quantitatively recycled from the reaction mixture using an external magnet and reused five times without significant loss of catalytic activity.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2016
·Vol. 26
·期 3
·481-487
·
IF 2.322
Zhen Zhang,Pengfei Zhou,Huanju Meng,Chengcheng Chen,Fangyi Cheng,Zhanliang Tao,Jun Chen
LiNi 0.915 Co 0.075 Al 0.01 O 2 (NCA) with Zr(OH) 4 coating is demonstrated as high performance cathode material for lithium ion batteries (LIBs). The coated materials are synthesized via a simple dry coating method of NCA with Zr(OH) 4 powders, and then characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Experimental results show that amorphous Zr(OH) 4 powders have been successfully coated on the surface of spherical NCA particles, exhibiting improved electrochemical performance . 0.50 wt% Zr(OH) 4 coated NCA delivers a capacity of 197.6 mAh/g at the first cycle and 154.3 mAh/g after 100 cycles with a capacity retention of 78.1% at 1 C rate. In comparison, the pure NCA shows a capacity of 194.6 mAh/g at the first cycle and 142.5 mAh/g after 100 cycles with a capacity retention of 73.2% at 1 C rate. Electrochemical impedance spectroscopy (EIS) results show that the coated material exhibits a lower resistance, indicating that the coating layer can efficiently suppress transition metals dissolution and decrease the side reactions at the surface between the electrode and electrolyte. Therefore, surface coating with amorphous Zr(OH) 4 is a simple and useful method to enhance the electrochemical performance of NCA-based materials for the cathode of LIBs.
研究领域:
电化学
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材料科学
·
能源存储
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电池技术
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无机非金属材料
·
固态化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Huanjing Chen,Wanqiao Bai,Hongmei Chai,Loujun Gao
To achieve the rapid and sensitive detection of trace methyl parathion (MP) in river water and edible agricultural products, the catalytic composite material zirconium hydroxide (Zr(OH)4)/zeolite imidazolate framework-90 (ZIF-90) was prepared by a one-step synthesis method. The composite was further incorporated with a conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hydrogel to prepare a modified electrode. Then, an electrochemical sensing method based on the PEDOT:PSS/Zr(OH)4/ZIF-90 composite was successfully established for the analysis and detection of MP. The component ratio of the composite material, modification amount and pH value of the detection substrate were optimized. The electrochemical properties of the composite modified electrode were evaluated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques, and the results confirmed that it had good electrochemical properties. The electrochemical response of the established sensing method to MP showed a good linear relationship in the concentration range of 1–250 µmol L−1, and its detection limit and sensitivity reached 0.74 µmol L−1 and 0.09 µA µmol−1 L−1, respectively. The interference of common coexisting ions on the detection performance of the PEDOT:PSS/Zr(OH)4/ZIF-90 modified electrode was further investigated, and it was applied for the quantitative analysis of MP in actual river water and apple samples. The electrochemical sensing method developed in this work provides a new way for the efficient detection of MP residues in environmental water and agricultural products.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 97
·期 1
·1-4
·
IF 2.008
Chen Wenming,Wang Haibo,Guo Xuan,Zhong Jinyi
Self-detoxifying materials for capturing and destructing chemical warfare agents (CWAs) have attracted intense attention in efficient personal protection and safe handling of contaminated materials. In this study, we reported an approach for synthesis of flexible Zr(OH) 4 -carbon fiber composite by sol–gel method. Activated carbon fibers serving as substrate carrier and adsorption conveyor could effectively make Zr(OH) 4 evenly distributed on the surface, which has excellent sorption properties and wide-ranging reactivity toward CWAs. The results demonstrated that the Zr(OH) 4 -carbon fiber composite could quickly remove (within 10 s) and 6-h degradation efficiency to 10-mg/mL sulfur mustard (HD) and O-ethyl S-(2-diisopropylamino)-ethyl methylphosphonothioate (VX) could reach 92.2 and 99.99%. In addition, it was found that Zr(OH) 4 -carbon fiber composite remained intact after adsorption, which could recollect resources and avoid Zr(OH) 4 leakage into waters. Therefore, the designed Zr(OH) 4 -carbon fiber composite will be a good potential application in precision equipment or skin decontamination equipment.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yaowu Wei,Xiujuan Wang,Yuan Chen,Wenguo Zhang,Junfeng Chen
The effect of Ca(OH) 2 and Zr(OH) 4 on the sintering behavior and thermal shock resistance of Y 2 O 3 ceramics were investigated in this study. The results showed that Ca(OH) 2 enhanced the densification of Y 2 O 3 ceramics. CaO generated from the decomposition of Ca(OH) 2 reacted with Y 2 O 3 to form a solid solution. The substitution of Ca 2 + for Y 3+ created V O ∙ ∙ that facilitated substance migration and pore elimination. Conversely, the introduction of Zr(OH) 4 exerted an adverse effect on the sintering. ZrO 2 produced by the decomposition of Zr(OH) 4 formed a solid solution with Y 2 O 3 which inhibited the sintering of Y 2 O 3 ceramics, where Zr 4+ primarily enhanced lattice stability rather than promoting sintering. The O i ′ ′ created by the substitution of Zr 4+ for Y 3+ reduced cation diffusion and hindered grain boundary migration. The mechanisms by which two types of additives affect the thermal shock stability of Y 2 O 3 ceramics are different. The Zr(OH) 4 -doped ceramics demonstrated better thermal shock resistance owing to their higher porosity, which changed energy release pathway and increased the resistance to crack propagation. In comparison, the improvement in the Ca(OH) 2 -doped ceramics mainly originated from the enhanced mechanical properties, which would suppressed crack initiation and delayed failure under thermal stress.
研究领域:
材料科学
·
陶瓷
·
热学性能
·
烧结技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Wang,Xiangyan He,Qi Zhang,Ling Luo,Tianping Lv,Xiuwu Wang,Junhua Zhang
Construction of highly efficient catalysts is crucial for the catalytic transfer hydrogenation (CTH) of bio-based carbonyls to valuable chemicals and fuels. Herein, we successfully synthesized a series of uniformly dispersed Zr(OH) 4 -Fe 3 O 4 nanoparticles with the regulation of sodium dodecyl benzene sulfonate (SDBS), which exhibited exceptional activity for the CTH of furfural (FAL) into furfuryl alcohol (FOL). Systematic characterizations revealed that SDBS effectively modified the interaction between Fe 3 O 4 and Zr(OH) 4 , thereby enhancing Lewis acidity by facilitating the construction of electron-deficient zirconium sites. Meanwhile, the presence of oxygen vacancies and surface hydroxyl groups in Zr(OH) 4 -Fe 3 O 4 -SDBS facilitated the adsorption and activation of both substrate and hydrogen donor. Thanks to these synergistic effects, a complete conversion of FAL with an impressive selectivity towards FOL was achieved, with a remarkable turn-over frequency value reaching as high as 42.5 h −1 . Encouragingly, Zr(OH) 4 -Fe 3 O 4 -SDBS also demonstrated its universality in the CTH of carbonyl compounds by exhibiting remarkable separation capability while maintaining its activity and structure after being reused for 11 cycles without significant changes.
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2019
·
IF 3.485
Xinyi Wu,Shiqi Dai,Ying Chen,Feng He,Haifeng Xie,Chen Chen
Objectives The present study aimed to evaluate effects of conditioning with the phosphate ester monomer 10-methacryloyloxydecyl dihydrogen phosphate (MDP), with and without precoating with zirconium hydroxide for nano-size zirconia fillers, on mechanical properties of dental resin composites . Materials and methods Nano-zirconia fillers coated with or without zirconium hydroxide [Zr(OH) 4 ] were prepared. Transmission electron microscopy (TEM), Fourier infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) were used to observe the coating and to characterize Zr(OH) 4 coating on the zirconia filler surface . Zirconia fillers with or without Zr(OH) 4 coating were conditioned with MDP and were subsequently used to prepare experimental resin composites. XPS was used to analyze the Zr-O-P bonds on the filler surface after MDP conditioning. Moreover, three-point bending strength and elastic modulus of prepared resin composites were measured, and Weibull analysis was performed. Resin composites without addition of zirconia fillers and the ones with addition of untreated or silane conditioned-zirconia fillers were set as controls. Cell counting kit (CCK)-8 was used to test cell cytotoxicity of these zirconia fillers-containing experimental resin composites. Results Nano-zirconia fillers were coated with Zr(OH) 4 through chemical deposition . FTIR and XPS analysis confirmed the increase of hydroxyl groups after Zr(OH) 4 coating. XPS detected the highest contents of Zr-O-P bonds on MDP-conditioned zirconia fillers with pre-Zr(OH) 4 coating, followed by MDP-conditioned zirconia fillers. Resin composite with added MDP-conditioned zirconia fillers with and without Zr(OH) 4 coating exhibited greater three-point bending strength, elastic modulus values, and Weibull moduli . According to the cytotoxicity classification, resin composites containing experimental zirconia fillers were considered to have no significant cell cytotoxicity. Conclusion Nano-zirconia fillers conditioned with MDP, with or without precoating with Zr(OH) 4 , improve the mechanical properties of resin composites, and are potentially safe for clinical use.
研究领域:
牙科材料
·
材料科学
·
机械工程
·
生物医学工程
·
生物材料
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）