APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Liping Ren,Wei Zhou,Bojing Sun,Haoze Li,Panzhe Qiao,Yachao Xu,Jiaxing Wu,Kuo Lin,Honggang Fu
Defect-engineered magnetic γ-Fe 2 O 3 ultrathin nanosheets/mesoporous black TiO 2 hollow sphere heterojunctions (γ-Fe 2 O 3 /b-TiO 2 ) are fabricated by a metal-ion intervened hydrothermal technique and high-temperature hydrogenation, which exhibit wide-spectrum response and magnetic separation. The specific surface area, pore size and pore volume of the resultant γ-Fe 2 O 3 /b-TiO 2 with hollow structure are ∼63 m 2 g −1 , 10.5 nm and 0.14 cm 3 g −1 , respectively. After surface hydrogenation, α-Fe 2 O 3 nanosheets are converted to γ-Fe 2 O 3 ultrathin nanosheets (∼6 nm) combined with the formation of surface defects. The ultrathin nanosheet structure facilitates the surface engineering and also favors the diffusion and transportation of photogenerated charge carriers. The apparent rate constant (k) of defect-engineered γ-Fe 2 O 3 /b-TiO 2 photocatalytic degradation biotoxic tetracycline is ∼3 times higher than that of α-Fe 2 O 3 /b-TiO 2 under AM 1.5 irradiation. The enhancement is attributed to the introduction of narrow bandgap unit-cell-thick γ-Fe 2 O 3 nanosheets, the hollow structure and the defect engineering, which are beneficial to solar-light-harvesting and rapid electron transport, and spatial separation of photogenerated charge carriers. The photocatalytic degradation mechanism is also proposed. The novel magnetic γ-Fe 2 O 3 /b-TiO 2 heterojunction is a promising photocatalyst for recovering the domestic sewage in environment.
研究领域:
材料科学
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环境科学
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纳米技术
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光催化
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
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2022
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IF 19.069
Liping Ren,Fanpeng Kong,Xufeng Wang,Yajie Song,Xudong Li,Fang Zhang,Nan Sun,Hanwen An,Zaixing Jiang,Jiajun Wang
The limited stability and the excessive dependence on external heating sources restrict the development of polymer-based solid-state Li-O 2 batteries . Herein, we propose a multifunctional composed cathode with the photo-electro-thermal synergy to achieve a PEO-based solid-state Li-O 2 (PSS Li-O 2 ) battery operating at room temperature. The multifunctional composed cathode consists of the traditional black TiO 2 photocatalyst and carbon cloth (b-TiO 2 /CC). The b-TiO 2 /CC harvests a full spectrum of sunlight, besides the photo-generated electrons and holes enhancing reaction kinetics during discharging and charging processes, though converting solar energy into heat to achieve self-heated replace on external. The photo-electro-thermal synergy-triggered PSS Li-O 2 battery establishes a low overpotential of 0.26 V and long durability of up to 90 cycles, which is a breakthrough for PEO-based Li-O 2 batteries operating at room temperature. A flexible PSS Li-O 2 battery is constructed and exhibits superior flexibility and mechanical stability . The mechanism of the photo-electro-thermal synergy provides a new strategy for PSS Li-O 2 batteries and advances the high-efficiency utilization of solar energy in portable devices.
研究领域:
材料科学
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电化学
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能量存储
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太阳能利用
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Xu Yan,Zipeng Xing,Yan Cao,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Qi Zhu,Shilin Yang,Wei Zhou
In-situ C-N-S-tridoped single crystal black TiO 2 nanosheets with exposed {001} facets are successfully fabricated via a facile hydrothermal method combined with an in-situ solid-state chemical reduction approach, followed by calcination at 450 °C. The crystal structure, crystallinity, morphology and composition of the as-prepared samples are investigated through X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, respectively. The results suggest that the obtained C-N-S-tridoped single crystal black TiO 2 nanosheets exhibit uniform nanosheet-like structure with exposed {001} facets and average length of ∼300–400 nm, thickness of ∼20 nm. The visible-light photocatalytic degradation rate of methyl orange is up to 92.13%, and photocatalytic hydrogen evolution is 149.7 μmol h −1 g −1 . The excellent photocatalytic activity can be ascribed to the synergetic effect of surface heterojunction between {001} and {101} facets, the C-N-S-tridoping, and the formed Ti 3+ species in photocatalyst, which can not only favor the visible-light absorption but also facilitate the separation and transfer of photogenerated charges.
研究领域:
材料科学
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化学
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纳米技术
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光催化
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
·
2022
·
IF 16.874
Ting Dai,Wenming He,Shuangshuang Tu,Jinru Han,Bo Yuan,Chenyang Yao,Wenzhi Ren,Aiguo Wu
Given that apoptosis increases the risk of plaque rupture, strategies that reduce intracellular lipid levels without killing foam cells are warranted for safe and effective treatment of atherosclerosis. In this study, a mild phototherapy strategy is carried out to achieve the hypothesis. Foam cell-targeted nanoprobes that allow photothermal therapy (PTT) and/or photodynamic therapy (PDT) were prepared by loading hyaluronan and porphine onto black TiO 2 nanoparticles. The results showed that when temperatures below 45 °C, PTT alone and PTT + PDT significantly reduced the intracellular lipid burden without inducing evidently apoptosis or necrosis. In contrast, the use of PDT alone resulted in only a slight reduction in lipid levels and induced massive apoptosis or necrosis. The protective effect against apoptosis or necrosis after mild-temperature PTT and PTT + PDT was correlated with the upregulation of heat shock protein 27. Further, mild-temperature PTT and PTT + PDT attenuated intracellular cholesterol biosynthesis and excess cholesterol uptake via the SREBP2/LDLR pathway, and also triggered ABCA1-mediated cholesterol efflux, ultimately inhibiting lipid accumulation in foam cells. Our results offer new insights into the mechanism of lipid regulation in foam cells and indicate that the black TiO 2 nanoprobes could allow safer and more effective phototherapy of atherosclerosis.
研究领域:
纳米技术
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光疗
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心血管疾病
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脂质代谢
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细胞生物学
✓ 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）