APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Linfeng Bai,Kezhu Xu,Wanquan Jiang,Min Sang,Qunling Fang,Shouhu Xuan,Xinglong Gong
Advanced nanocatalysts integrating with high activity and recyclability is one of the most important issues in heterogeneous catalysis. Magnetic hierarchical nanostructures comprising noble metal nanocrystals confined within a protecting penetrable shell will be favored as an efficient candidate toward robust catalytic reactions. This work reports a proof-of-concept magnetic separable nanocatalyst with the polydopamine (PDA)-confined-Au-nanocrystals assembled on the hierarchical surface of Fe 3 O 4 @SiO 2 @γ-AlOOH microflower (Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA). Because of the high surface area of γ-AlOOH hierarchical nanoarchitectures, the loading capacity and dispersity of Au nanocrystals are both improved. These magnetic microflowers present excellent catalytic efficiency and cycling performance in reduction of 4-nitrophenol to 4-aminophenol, which can be ascribed to the superior structure of catalyst. After 9 cycles, the activity of Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA maintains as high as 97.3% due to the protection of PDA shell. In comparison to the spherical Fe 3 O 4 @SiO 2 @Au/PDA, the as-prepared Fe 3 O 4 @SiO 2 @γ-AlOOH@Au/PDA microflowers exhibit quicker catalytic dynamic. The concept of hierarchical nanostructure and penetrable PDA protective layer will be instructive for fabricating high-performance nanocatalysts.
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2025
·Vol. 40
·期 6
·1739-1749
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IF 1.1
Zeng Fanbiao,Liu Zhanwei,Yan Hengwei,Li Lan,Li Mengnan,Hu Mingyi
To efficiently address the current high cost associated with preparing pseudo-boehmite from organic aluminum, a low-cost alternative, AlCl 3 , is employed as the raw material. The sol-gel method is utilized, and H 2 O 2 is incorporated for the modification of pseudo-boehmite. The modification mechanism is thoroughly investigated through the use of X-ray powder diffractometer, scanning electron microscope, and BET data analysis, as well as molecular dynamics simulations. Under specific conditions (temperature at 80 °C, pH=7, and H 2 O 2 volume ratios of 0.5:1, 1:1, and 2:1), mesoporous pseudo-boehmite is synthesized with a specific surface area of 227 m 2 /g, a pore volume of 0.281 cm 3 /g, a pore size of 6.78 nm, and a peptizing index of 99.47%. A novel and innovative methodology for the cost-effective production of high-performance alumina is offered through the approach.
研究领域:
材料科学
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化学工程
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纳米技术
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计算化学
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高影响因子
JOURNAL OF CATALYSIS
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2026
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IF 6
Shaozhi Liu,Honggang Zhang,Zeyan Wang,Hefeng Cheng,Peng Wang,Zhaoke Zheng,Ying Dai,Baibiao Huang,Yuanyuan Liu
Catalytic ozonation offers a promising approach for removing perfluorinated compounds, yet developing catalysts with both high activity and stability remains a great challenge due to severe metal ions leaching. Herein, we design a Mn single atom decorated γ-AlOOH catalyst (denoted as Mn x /γ-AlOOH), which displays efficient catalytic ozonation towards perfluorooctanoic acid (PFOA) removal. Under optimal conditions, Mn 2.2 /γ-AlOOH achieves a defluorination ratio of 99.39% after 15 h of catalytic ozonation process, with a distinctive low leaching percentage (0.52% for Mn and 0.21% for Al, compared to 10.44% for Mn leaching from MnO 2 and 0.95% for Al leaching from γ-AlOOH). Comprehensive analysis indicates that the introduction of Mn single atom optimizes the electronic structure and provides an additional indirect electron transfer pathway, which not only facilitates O 3 activation, but also reduces Mn ion leaching by decreasing electron loss, and simultaneously enhances the activity and stability of the catalyst. This work provides new insights into enhancing the activity and stability of catalysts during the catalytic ozonation process via the rational design of atomically dispersed sites.
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POLYMER COMPOSITES
·
2026
·
IF 4.7
Mengfei Du,Enhao Zhu,Xilai Yan,Zhe Wang,Ke Wang
Enhancing the durability of ultraviolet-cured-in-place pipe (UV-CIPP) in alkaline environments remains challenging due to its long-term exposure to concrete pore solution from the original pipe. Herein, a novel strategy that γ-AlOOH coating assists to immobilize Irganox 1010 onto glass fibric (GF) was proposed for simultaneously improving alkaline corrosion resistance and mechanical properties of UV-CIPP. Through the beneficial bridging of γ-AlOOH with the coupling agent, Irganox 1010 was immobilized on the GF (GF-Al-g-1010) surface through hydrogen bonding and covalent bonding. The leaching of Si 2+ from the GF backbone of unsaturated polyester resin (UP)/GF-Al-g-1010 composite was reduced by 40.60% and the hydrolyzed alcohol products decreased by 47.1%. Meanwhile, the mechanical properties of UP/GF-Al-g-1010 remained well preserved. The flexural and tensile modulus retained at 99.0% and 96.3%, respectively. The immobilization of Irganox 1010 at the UP/GF interface formed a protective hydrophobic layer and stabilized free radicals, which together inhibited resin degradation and reduced interface debonding. Moreover, the flexural strength and modulus of composites increased by 36.5% and 38.4%, respectively. The chemical bonding between GF-Al-g-1010 and UP chains enhanced interfacial adhesion. In summary, this work will facilitate the design of UV/thermal dual-cured composites with high strength and alkaline corrosion resistance for pipeline rehabilitation. Highlights A novel AlOOH coating assists to immobilize Irganox 1010 onto glass fabric. The flexural strength and modulus increased 36.5% and 38.4%, respectively. The Si 2+ leaching and hydrolyzed alcohol products were reduced by 40.60% and 47.1%. The flexural and tensile modulus retention reached 99.0% and 96.3%, respectively. The AlOOH-1010 coating improved both durability and mechanical properties.
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APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Meng Tian,Xueliang Cui,Chunxu Dong,Zhengping Dong
In this study, a novel catalyst has been prepared through supporting Pd nanoparticles (NPs) on the surface of boehmite (γ-AlOOH) based hollow aluminosilicate microspheres (HAM@γ-AlOOH). The prepared Pd/HAM@γ-AlOOH catalyst has high catalytic activity for the hydrogenation of nitroarenes to their corresponding amino derivatives with high yields at ambient conditions. The high catalytic efficiency is attributed to the large pore size of the flower-like hierarchical flakes structure of HAM@γ-AlOOH, that gives Pd NPs on the support surface easy accessibility. Moreover, the Pd/HAM@γ-AlOOH catalyst can also be easily recycled at least five times without obvious decrease of catalytic activity. This work may provide a useful method for the fabrication of supported noble metal NP-based catalysts on the surface of mesoporous hierarchical structure materials with easy accessibility and superior activity.
研究领域:
催化
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材料科学
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化学工程
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 52
·期 2
·376-383
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IF 4.569
Enming Ping,Lingyun Kong,Mengyao Liu,Yunshan Zhou,Lijuan Zhang,Nan Chen
The reaction of porous γ-Al2O3 particles acting as both a sacrificial template and an aluminum source with 1,4-naphthalene diacid (H2NDC) resulted in the formation of γ-AlOOH@Al(OH)(1,4-NDC) composites, in which ZIF-67 was then loaded by the in situ crystallization method, leading to the formation of γ-AlOOH@Al(OH)(1,4-NDC)@ZIF-67 composites. The deliberately designed composite was used to separate H2/D2 at 77 K in a 1 m chromatographic column. The results demonstrated that the optimized composite can achieve the effective separation of H2/D2 in gas chromatography due to the additive effects of kinetic sieving and chemical affinity quantum sieving of Al(OH)(1,4-NDC) and ZIF-67. By optimizing chromatographic separation conditions, the resolution R reached 2.02 with the separation time t = 7.72 min. The composite also showed satisfactory repeatability and reproducibility.
研究领域:
材料科学
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分离科学
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物理化学
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纳米材料
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能源化学
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高影响因子
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