APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Xingchao Zhang,Ruoyu Zhang,Siying Niu,Jiming Zheng,Chongfeng Guo
The MoS 2 /g-C 3 N 4 heterojunction composite (marked as MoS 2 /g-C 3 N 4 -H) was successfully prepared via calcining the melamine coated MoS 2 nano-sphere, where the thin g-C 3 N 4 nano-sheets were tightly grown on the surface of MoS 2 nano-sphere to form MoS 2 inlaying in g-C 3 N 4 heterostructure. The detailed charge transfer mechanism was discussed by combining theoretical calculation and experiments, in which the intrinsic cause of photo-generated charge separation and transfer was determined as the directional built-in electric field driven by different Fermi levels of MoS 2 and g-C 3 N 4 . Comparatively, the enhanced photo-catalytic performance and stability of the sample were assessed by degrading the Rhodamine (RhB) and reducing the Dichromate (Cr 6+ ) solutions under the irradiation of the simulated sunlight, which could be attributed to the widened spectral absorption range and improved electron-hole separation rate. Based on above results, the photo-catalytic mechanism involving redox reactions was also clearly proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 11
·8403-8412
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IF 2.22
Wang Ting,Ma Qing,Gao Shang,Huang Mengshi
Highly regular TiO 2 nanotube arrays (TNTs) with interstitial nitrogen as the dominant point defect have been successfully prepared by annealing the as-anodized TNTs in N 2 in a temperature range of 400–650 °C. Using analysis methods that include field emission scanning electron microscopy, X-ray diffraction patterns, and Raman spectroscopy, the thermal stability of TNTs annealed in N 2 was found to be higher than that of TNTs annealed in O 2 . The interstitial nitrogen is considered as the dominant point defect in TNTs annealed in N 2 , which results in the notably improved thermal stability of the highly ordered TNTs. However, the content of hydroxyl oxygen on the surface of TNTs is significantly influenced by annealing temperature, which is closely related to photocatalytic activity. Optimized photocatalytic property of photodegradation of MO with a pseudo-first-order reaction constant k value of (5.065 ± 0.139) × 10 –2 h −1 is achieved for TNTs annealed in N 2 at 600 °C. These findings serve to provide simple and versatile guidelines to fabricate highly ordered TNTs with controllable point defects, enhanced thermal stability, and a high level of photocatalytic activity.
研究领域:
材料科学
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纳米科技
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光催化
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表面化学
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功能材料
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2020
·
IF 3.085
Jiaoming Wang,Xiang Yu,Xionghui Fu,Yi Zhu,Yuanming Zhang
To solve severe photocorrosion of Ag 3 PO 4 , polyaniline for transporting holes and reduced graphene oxide (rGO) for transferring electrons were co-incorporated with Ag 3 PO 4 by an in-situ precipitation procedure and a following hydrothermal method , reaching the superior carrier separation efficiency via synergetic effect of PANI and rGO. Consequently, 5% rGO/Ag 3 PO 4 /PANI exhibited the excellent photocatalytic performance of 86.2% removal rate towards ciprofloxacin (CIP) within 15 min, which was much better than Ag 3 PO 4 , Ag 3 PO 4 /PANI and many reported photocatalysts . After four consecutive cycles, the composites performed better stability with 81.0% removal rate. Generally, photocatalytic activity depended on efficiencies of light absorption ( η abs ), charge separation ( η sep ) and charge injection ( η inj ). η sep of rGO/Ag 3 PO 4 /PANI was 11.5 and 8.70 folds higher than that of Ag 3 PO 4 and Ag 3 PO 4 /PANI, while η abs and η inj of rGO/Ag 3 PO 4 /PANI were not improved compared with Ag 3 PO 4 and Ag 3 PO 4 /PANI, strongly manifesting synergetic effect of PANI and rGO on Ag 3 PO 4 accelerated the charge separation and finally enhanced the photocatalytic activity . Besides, rGO greatly improved the adsorption efficiency for CIP and the maximum adsorption capacity was enhanced to be 19.4 mg/g which was 6.88 folds than that of Ag 3 PO 4 , being advantageous to enhancing the photocatalytic activity. The work offered an excellent reference for designing and constructing photocatalysts with superior charge separation showing excellent photocatalytic performance, which were potential candidates for degrading antibiotics in environmental treatment.
研究领域:
材料科学
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环境化学
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光催化
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纳米材料
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环境污染治理
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半导体催化
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抗生素降解
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2019
·Vol. 40
·期 5
·631-637
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IF 4.914
Zhenmin Xu,Ru Zheng,Yao Chen,Jian Zhu,Zhenfeng Bian
Ordered mesoporous Fe/TiO 2 was prepared by an evaporation-induced self-assembly method. The iron ions were in situ embedded in the pore wall of the TiO 2 framework. The catalyst has excellent light-assisted Fenton catalytic performance under UV and visible light irradiation. X-ray diffraction and transmission electron microscopy results showed that the TiO 2 samples have an ordered two-dimensional hexagonal pore structure and an anatase phase structure with high crystallinity . The ordered pore structure of the TiO 2 photocatalyst with a large specific surface area is beneficial to mass transfer and light harvesting. Furthermore, iron ions can be controlled by embedding them into the TiO 2 framework to prevent iron ion loss and inactivation. After five cycles, the reaction rate of the ordered mesoporous Fe/TiO 2 remained unchanged, indicating that the material has stable performance and broad application prospects for the purification of environmental pollutants .
研究领域:
材料科学
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环境化学
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催化化学
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纳米科技
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光化学
✓ 已验证
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 67
·62675-62679
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IF 3.289
Yongzheng Wang,Jing Ye,Yu Shen,Mingjiang Xie,Shuangshuang Yang,Chao Liu,Xiangke Guo,Luming Peng,Weiping Ding,Xuefeng Guo
Anatase-type titania with ultrathin nanosheet morphology and sintering-resistant structure was constructed from monolayer titanate nanosheets isolated by uniform silica nanoparticles. The obtained anatase titania nanosheets possess high accessible surface area, ultrathin thickness (∼0.6 nm), dominant (116) facets exposed, wide bandgap and exhibits excellent photocatalytic activity.
研究领域:
材料科学
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纳米科技
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光催化
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无机化学
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能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）