Materials Research Express
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2021
·Vol. 8
·期 7
·075001
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IF 1.62
Haibin Xue,Xuewei Gao,Xiangnan Feng,Shan He,Feifei Zhao,Guiju Zhang,Xinrui Wang,Xiaobo Luo,Shanyue Guan
The developing a green and facile synthetic approach of Ag-based antibacterial nanomaterials with controlled composition, size, and shape, to acquire high antibacterial activity and long-term durability, is of vital importance and remains a challenging goal. Herein, a novel LDHs-supported Ag antibacterial nanomaterial (Ag/CoAl-LDHs) are fabricated via an in situ deposition of the Ag nanoparticles onto the CoAl-LDHs surface. X-ray diffraction pattern (XRD) and High-resolution TEM (HRTEM) measurements confirm that the uniform Ag nanoparticles (the average particle size of 16.5 nm) are highly dispersed and firmly anchored onto CoAl-LDHs surface. As revealed by x-ray photoelectron spectroscopy (XPS), the CoAl-LDHs nanoplates play the roles of both a support and a reductant without any external, and there was a redox reaction between Co2+ in LDHs layers and Ag+ in AgNO3 solution, giving rise to in situ loading of Ag nanoparticles onto LDHs. Moreover, antibacterial experiments verify that Ag/CoAl-LDHs not only have efficient antibacterial activity against both Escherichia coli and Staphylococcus aureus, but also exhibit very stable antibacterial properties for both bacteria. Therefore, this research demonstrates a successful paradigm for the rational design and preparation of new antibacterial nanomaterials with high antibacterial activity and long-term durability.
研究领域:
材料科学
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微生物学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shengjie Xia,Guanhua Zhang,Zhiyan Gao,Yue Meng,Bo Xie,Hanfeng Lu,Zheming Ni
In this paper, the novel 3D hollow Z-scheme heterojunction photocatalysts based on Bi 2 O 3 and CoAl layered double hydroxides (Bi 2 O 3 @CoAl-LDHs) were prepared for efficient visible-light-driven photocatalytic ammonia synthesis . The synthesized nanohybrid exhibits excellent photocatalytic ammonia synthesis performance (48.7 μmol·L −1 ·h −1 ) and structural stability , which is primarily attributed to the fact that Z-scheme heterojunction significantly enhanced lifetime of photogenerated carriers (6.22 ns) and transfer efficiency of surface photogenerated electrons (72.5%). Strict control experiments and nitrogen isotope labeling results show that nitrogen and hydrogen in the produced ammonia come from nitrogen and water in the reactant respectively. Electron paramagnetic resonance (EPR) experiments and density functional theory (DFT) calculations further reveal that the built-in electric field due to the difference between Bi 2 O 3 and CoAl-LDHs is the key to constructing the Z-scheme heterojunction. In addition, results of partial density of states (PDOS) show that Co in Bi 2 O 3 @CoAl-LDHs composite is the active site for photocatalytic N 2 fixation.
研究领域:
材料科学
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光催化
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纳米技术
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能源化学
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环境科学
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无机化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Shuanglian Jia,Wenfeng Li,Che Qian,Guofang Du,Zetian He,Yu Liang
Construction of ultrathin CoAl-LDHs/g-C 3 N 4 Type-II heterojunction via an electrostatic self-assembly. • Type-II band alignment suppresses charge recombination and boosts charge separation. • Bifunctional design enables efficient H 2 evolution and pollutant degradation. • In-situ XPS and DFT calculations validate the proposed charge transfer pathway. Constructing efficient and stable heterojunction photocatalysts was crucial for achieving bifunctional applications in antibiotic degradation and photocatalytic hydrogen production. Herein, an ultrathin CoAl-LDHs/g-C 3 N 4 Type-II heterojunction was successfully fabricated via an electrostatic self-assembly strategy, and its performance was systematically evaluated for both ciprofloxacin (CIP) degradation and visible-light-driven hydrogen evolution reaction (HER). The optimal CAC2 sample (CAC2, mass ratio of 1:2) achieved a CIP degradation efficiency of 84.9%, which was 1.9-fold and 3.3-fold higher than those of pristine CoAl-LDHs (CAL) and g-C 3 N 4 (CN), respectively. Meanwhile, it delivered a remarkable hydrogen evolution rate of 1935.67 μmol·g −1 ·h −1 , which was 263.3 and 6.5 times higher than those of pristine CAL and CN, respectively. The significantly improved hydrophilicity of the heterojunction enhanced the interfacial enrichment of CIP. Active species trapping experiments confirmed that h + acted as the dominant reactive species, while ·O 2 - played an auxiliary role. Combining XPS, work function calculations, and in situ XPS under light irradiation, we strongly indicate that electrons spontaneously transfer from CAL to CN in the dark, establishing a built-in electric field (BIEF) oriented from CAL to CN. Upon light excitation, the photogenerated electrons migrate from CN to CAL following the typical Type-II pathway, which together with the BIEF synergistically facilitates spatial charge carrier separation. This study elucidated the structure-activity relationship of the electrostatic self-assembled Type-II heterojunction for bifunctional photocatalysis, offering a new paradigm for designing efficient and robust catalytic materials for environmental and energy applications. Download: Download high-res image (253KB) Download: Download full-size image
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DOI
高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 24
·6401-6409
·
IF 4.853
Yuhang Du,Yufei Lu,Hongjian Zhang,Zhentao Nie,Zhicheng Sun,Congying Han,Ruizi Li,Jixin Zhu
Graphical Hierarchical benefits : A three-dimensional hierarchical arrays structure assembled from nanosheets based on nickel foam was obtained by a simple soft chemical synthesis method. The composite was employed as the electrode of water splitting device to generate hydrogen and exhibited favorable hydrogen evolution efficiency, which benefits from the novel structural design and the synergistic effect of two components of Ni 3 S 2 and LDHs in the hydrogen evolution reaction. Designing an electrocatalyst with optimized structure and performance is vital for the electrolysis of water to produce hydrogen. Herein, a three-dimensional (3D) hierarchical composite electrode material is proposed for alkaline hydrogen evolution reaction (HER), consisting of Co−Al hydroxides (CoAl-LDHs) nanosheets decorated with vertically aligned nickel sulfide (Ni 3 S 2 ) arrays (Ni 3 S 2 @CoAl-LDHs/NF). The as-obtained electrocatalyst displays a minimum overpotential of 175 mV at 10 mA cm −2 toward HER. Electrochemical impedance spectroscopy and Tafel slope further reveals outstanding kinetics in the electrolysis process. The catalytic performance of the electrode can still maintain 90 % capacity after 1000 CV cycles. The outstanding properties of the composite material benefits from its unique 3D hierarchical structure, which promote plentiful active sites and faster electronic transfer rate. This work sheds lights on the current research of noble-metal-free electrocatalysts and the design of overall water splitting.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 5
·2623-2631
·
IF 4.036
Kexin Zhou,Xing-peng Liu,Hongyun Guo,Hui-qiang Li,Ping Yang
Heterogeneous electro-Fenton is one of the promising technologies to degrade refractory organic phosphonates. In this work, CoNWs@CoAl-LDHs/Fe3O4 and CoNPs@CoAl-LDHs/Fe3O4 were successfully synthesized by a co-precipitation method and applied to degrade 1-hydroxyethane-1,1-diphosphonic acid (HEDP) and glyphosate (PMG) via an electro-Fenton process. The results indicated that the removal rate of HEDP (100 mg L−1) and PMG (100 mg L−1) by CoNWs@CoAl-LDHs/Fe3O4 increased from 62.09% and 95.31% to 82.45% and 100%, respectively. The CoNPs@CoAl-LDHs/Fe3O4 electro-Fenton system could remove 70.03% of HEDP and nearly 100% of PMG within 2 hours at a pH of 3. Moreover, we compared the SEM, EDS, XRD and BET results of CoNWs@CoAl-LDHs/Fe3O4 with those of CoNPs@CoAl-LDHs/Fe3O4. The effects of initial pH, CoNW dosage and reaction time on the degradation of HEDP and PMG were discussed. CoNWs@CoAl-LDHs@Fe3O4 could even remove 71.03% of HEDP at a neutral pH. After four cycles of repeated use at a pH of 3, the removal rate of HEDP by CoNWs@CoAl-LDHs/Fe3O4 was still higher than 70%. Radical quenching experiments revealed that ˙OH is the dominant active species participating in the heterogeneous electro-Fenton process. Finally, we would talk about the mechanism of the CoNWs@CoAl-LDHs/Fe3O4-based electro-Fenton system.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
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