COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yu Huang,Xinyang Xu,Guangjian Fan,Xiaoxuan Zhu,Lin Zhu,Xi Chen
The effect of TiO 2 crystal phase on the photocatalytic properties of TiO 2 /g-C 3 N 4 heterojunction photocatalyst under sunlight irradiation was investigated through experiments and theoretical calculations. Results reveal that for TiO 2 /g-C 3 N 4 heterojunction photocatalyst, anatase phase TiO 2 can adjust the band edge positions to ensure the generation of strongly oxidizing radical species (·O 2- and ·OH), and rutile phase TiO 2 can effectively reduce the band gap to more efficiently utilize sunlight. Consequently, the combination of g-C 3 N 4 with P25 TiO 2 composed of both anatase and rutile phases is the most favorable combination for sunlight-driven photocatalyst among the obtained three TiO 2 /g-C 3 N 4 heterojunction photocatalyst. P25 TiO 2 and g-C 3 N 4 form a type-II/type-II heterostructure with stepped heterojunction and concave heterojunction. The P/CN photocatalyst exhibits excellent photocatalytic activity with degradation efficiencies for naphthalene reaching 100% within 120 min of sunlight irradiation, as well as considerable stability. The combination of P25 TiO 2 and g-C 3 N 4 has shown significant potentials in improving the separation and transfer efficiency of photogenerated electron-hole pairs, as well as enhancing the utilization of sunlight in photocatalytic process. This work provides a promising strategy for the preparation of highly active TiO 2 /g-C 3 N 4 heterojunction photocatalyst for the effective treatment of naphthalene from water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
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2022
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IF 5.545
Wang Yaju,Zhou Zhiming,Wang Chao,Zhao Leihong,Xia Qineng
The selective hydrogenolysis of glycerol to 1,3-propanediol (1,3-PDO) with high added value is attraction but challenging. Pt-WOx-based catalysts have been extensively studied in the selective hydrogenolysis of glycerol. The catalyst support and the physicochemical state of WOx play important roles on this reaction. In this paper, Pt-WOx catalysts supported on TiO2 with different crystal forms were prepared and studied for their catalytic performance in hydrogenolysis of glycerol. It was observed that the catalytic performance of anatase-type (A-type) TiO2-supported catalyst (Pt/W/A-Ti) is much better than that of the rutile-type (R-type) TiO2 catalyst (Pt/W/R-Ti) due to its higher stability. Furthermore, the influence of W loading amount and state were thoroughly investigated for the Pt/W/A-Ti catalysts, and Pt/W/A-TiO2 with 5 wt% loading of WOx achieved the best catalytic performance (100% conversion of glycerol and 41% yield of 1,3-PDO under the optimal reaction conditions), owing to the suitable WOx domains and high dispersion of W species, as evidenced by XRD patterns and TEM images. Mechanism study by in-situ DRIFTS experiments indicated that glycerol was first converted to 3-hydroxypropanal and then converted to 1,3-PDO through subsequent reactions.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
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2023
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IF 7.3
L. Lv,S. Wang,Z. Zhang,L. Wang,P. He
Supported Ru catalysts over TiO 2 with various crystal phases were prepared, which involved rutile, anatase, and their mixed phase. And their catalytic activities for CH 3 Br complete oxidation were investigated. Results showed Ru/TiO 2-700-4 that TiO 2-700-4 is sourced from anatase TiO 2 calcined at 700 °C for 4 h is the most active catalyst among these catalysts. The content of rutile phase on the surface is lower than the bulk. Strong metal support interaction occurs owing to lower lattice mismatch between RuO 2 and rutile TiO 2 . It was further verified by H 2 -temperature programmed reduction, ultraviolet-Raman and transmission electron microscopy . Especially mixed-phase TiO 2 is more conductive to higher dispersion of RuO 2 than pure phase TiO 2 , which is easier to form epitaxial growth . The catalytic activity for CH 3 Br complete oxidation was not in exact accord with the dispersion of Ru. It is possibly attributed to the combination of arguably favorable physico-chemical properties of more Ru active sites, electron transfer , and appropriate surface acidity. At the low reaction temperature, more Ru active sites are beneficial for the total oxidation of CH 3 Br. With the increase of temperature, higher activity is prone to strong surface acidity and electron transfer, as was confirmed by X-ray photoelectron spectra and NH 3 -temperature programmed desorption analysis.
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Manjing Tang,Zhi Tan,Jie Xing,Ning Chen,Hao Chen,Hongjiang Li,Jianguo Zhu
The study conducts an in-depth analysis of the role of the crystal phase and particle size of TiO 2 in the preparation of La 2 Ti 2 O 7 (LTO) ceramics via the conventional solid-state method. Comparative studies on crystal structure, micromorphology, electrical properties and mechanical properties were performed, revealing that the selection of TiO 2 raw materials greatly influences the structure and performance of LTO ceramics, resulting in significant differences in the grain sizes, electrical properties, and mechanical properties of the ceramics. Among the various TiO 2 sources, the LTO ceramics synthesized with nano-rutile TiO 2 exhibit superior overall performance. The smaller grain size of 1.43 nm for the ceramic and higher relative density of 98.27 %, significantly enhance their electrical and mechanical properties. The piezoelectric constant is 1.5 pC/N at room temperature and 1.4 pC/N after annealing at 1000 °C for 48 h. The high Curie temperature with 1450 °C, high resistivity with 3.93 × 10 6 Ω cm at 600 °C, high hardness of 9.89 GPa and small change in elastic modulus make it excellent candidates for high-temperature electronic component applications.
研究领域:
材料科学
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陶瓷
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固体物理
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
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