ACS Applied Nano Materials
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2022
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IF 6.14
Fengmin Qin,Jiankang Zhang,Zhan Zhou,Hao Xu,Lin Cui,Zhengxing Lv,Yong Qin
Nanozymes have great potential to replace natural enzymes due to their multiple enzyme-mimicking properties in practical applications, and the development of high-efficiency nanozymes is of great necessity. Herein, FeOx/TiO2 nanozymes with confined structures were synthesized by atomic layer deposition (ALD), among which the 70FeOx/TiO2 nanozymes with highly dispersed Fe single atoms and FeOx nanoclusters confined in the pores of TiO2 nanoflower supports exhibit optimized peroxidase activity. Furthermore, the ultrathin modification strategy of ALD (1-cycle TiO2) followed by reduction treatment was conducted to achieve the 1TiO2-70FeOx/TiO2-H nanozymes, whose enzyme-like activity is almost 2 times higher than that of 70FeOx/TiO2 counterparts. Investigation of the catalytic mechanism shows that atomic-level modification of TiO2 modifies the FeOx electron states, contributing to the stronger capability to generate hydroxyl radical, which results in remarkably enhanced peroxidase activity. The present work may provide new insights into the rational design of high-efficiency nanozymes at an atomic level.
研究领域:
材料科学
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催化化学
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生物医学
✓ 已验证
产品关联
DOI
高影响因子
THIN SOLID FILMS
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2018
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IF 1.939
Qing-Er Zhao,Wei Wen,Yu Xia,Jin-Ming Wu
This study establishes the feasibility to enhance the photocatalytic activity of nanostructured TiO 2 thin films through embedding the free spaces with sol-gel TiO 2 nanoparticles . With the various additives in the aqueous H 2 O 2 solutions, thin films of TiO 2 nanorods , nanowires, and nanoflowers were precipitated on metallic Ti substrates via the Ti-H 2 O 2 interactions at 80 °C for 72 h. About 3–7% anatase TiO 2 nanoparticles were then embedded successfully among the free spaces of the nanostructures by immersing them into a titania sol followed by lifting up with an appropriate withdrawing speed. When utilized to assist degradations of phenol in water under UV light illumination, the photocatalytic activity for thin films of nanorods and nanowires after filling with sol-gel TiO 2 nanoparticles is 76% and 136% higher than that of the pristine films, respectively. The films also exhibited high stability upon cycling tests, which could thus find potential applications in wastewater treatments.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Zhendong Yu,Suhang Xun,Meizan Jing,Haofeng Chen,Weiyu Song,Yanhong Chao,Mohammad Rahmani,Yuxiao Ding,Mingqing Hua,Jian Liu,Wenshuai Zhu
To prevent SO x emission and produce low-sulfur diesel oil, we develop a 3D assembly TiO 2 nanoflower catalyst with controllable oxygen vacancies for oxidative desulfurization (ODS) in diesel oil. The roles of oxygen vacancy (OV) and associated Ti 3+ in TiO 2 are fully discussed: the increased OV and Ti 3+ are beneficial for the promoted chemical adsorption of peroxy groups, from − 0.5 eV to − 1.26 eV; also facile to the reduction of the energy barriers of O-O and O-H bonds cleavage, respectively by 1.38 eV and 1.24 eV, thus greatly boosting the generation of hydroxyl radicals·OH and superoxide radicals·O 2 - . Besides, the ODS reaction undergoes two possible pathways, the mechanism and the kinetics are investigated. Above all, the 100% ODS rate can be obtained in only 30 min under optimal conditions, showing a promising perspective of oxygen vacancy engineering for converting hazardous sulfides into high-value chemicals.
研究领域:
材料科学
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催化
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环境化学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xuhong Jiang,Mengmeng Sun,Zhuoyuan Chen,Jiangping Jing,Guiying Lu,Chang Feng
Boosting the photoinduced cathodic protection (CP) for metals in NaCl solution is crucial for achieving the application of photoelectrochemical conversion in marine corrosion protection. An environmentally friendly three-dimensional ZnIn 2 S 4 /TiO 2 nanoflowerbush (NFB) photoelectrode was constructed with sufficient interfacial incorporation based on the ultrafine branched TiO 2 nanobush substrate via a facile in situ hydrothermal method . This ZnIn 2 S 4 /TiO 2 NFB nanoheterojunction composite behaves excellent photoinduced CP performance for metallic materials. This is owing to the optimized construction of photoelectrode with relatively negative band potential, wide solar spectrum response, effective generation and collection of photoinduced electrons. The morphology, distribution and performance of ZnIn 2 S 4 vary with different substrates. The pure ZnIn 2 S 4 powder is nanoflower sphere composed of a lot of thin petals; when ZnIn 2 S 4 grow onto the FTO glass, the ZnIn 2 S 4 petals are distributed vertically on the two-dimensional structure; when ZnIn 2 S 4 grow on the three-dimensional ultrafine branched TiO 2 nanobush substrate, a ZnIn 2 S 4 /TiO 2 NFB architecture with ultrafine TiO 2 branchlet cores are formed. This ZnIn 2 S 4 /TiO 2 NFB photoelectrode can achieve efficient photoinduced CP performance for pure copper and low alloy steels with different negative self-corrosion potentials, such as Cu (−0.18 V), E40 (−0.45 V), Q345 (−0.55 V) and Q235 carbon steel (−0.65 V) under simulated sunlight irradiation in NaCl solution without additional hole scavengers, and the photoinduced CP current densities reach as high as 170, 72, 63 and 44 μA cm −2 , respectively. The high-efficiency photoinduced CP performance is closely related to the band structure gradient matching between the TiO 2 and ZnIn 2 S 4 , prompting both the widened absorption of solar spectrum and high-efficiency transfer of the photogenerated electron–hole pairs. Importantly, the negative band potential of ZnIn 2 S 4 endues a lower surface work function which benefits the electron transport to the under-protected metallic materials to achieve photoinduced CP. This photoelectrode exhibits huge photoinduced CP application potential in marine environments.
研究领域:
材料科学
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电化学
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腐蚀科学
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光电化学
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海洋工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）