CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Guoqiang Shen,Lun Pan,Zhe Lü,Chongqing Wang,Fazal-e- Aleem,Xiangwen Zhang,Ji-Jun Zou
Adsorption and photodegradation are promising approaches for removing organic pollutions. In this study, we combined these two processes by co-loading Fe-TiO 2 and Fe 2 O 3 quantum dots (QDs) on porous MCM-41, using a simple hydrolysis method. X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy results indicated that Fe-TiO 2 QDs are formed at low Fe precursor concentrations, while additional Fe 2 O 3 QDs are formed at higher Fe precursor concentrations. The Fe 2 O 3 and Fe-TiO 2 QDs impart high adsorption capacity and high photoactivity to the porous MCM-41, respectively. Thus, their combination results in a synergic effect of the adsorption and photodegradation. The highest-performing sample exhibits excellent performance in removing rose bengal from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Ziyu Qin,Chao Ouyang,Jian Zhang,Li Wan,Shimin Wang,Changsheng Xie,Dawen Zeng
Recently, Tungsten disulfide (WS 2 ) nanosheets are widely used for room-temperature NH 3 sensing. However, the lower sensitivity and the microstructural instability severely limit its potential application. Here, few- or mono-layer WS 2 nanosheets decorated with different amounts of TiO 2 quantum dots (QDs) were successfully prepared for room-temperature NH 3 sensing. The gas sensing studies revealed that the nanohybrids exhibited significantly enhanced sensitivity to NH 3 at room temperature. The response of nanohybrids with the optimal molar ratio to 250 ppm NH 3 is nearly 17 times higher than that of the pristine WS 2 . Especially, the TiO 2 QDs decorated WS 2 nanohybrids showed almost no decline in sensitivity after several testing cycles, indicating the long-term stability of the nanohybrids-based sensing materials. The sensing mechanism based on the largely enhanced sensitivity and the long-term stability of nanohybrids also discussed in detail. It was believed that the largely enhanced sensitivity was attributed to the effective electron transfer between the WS 2 and the TiO 2 QDs through S O Ti bonding, which was confirmed by XPS analysis. We hope that this work could help us to further understand the QDs sensitization mechanism and could provide a guideline to explore more transition metal dichalcogenides-based gas sensors with even higher sensing performances.
研究领域:
材料科学
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传感器技术
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纳米技术
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
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2019
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IF 5.439
Tao Wang,Xiqing Liu,Qiuyue Men,Changchang Ma,Yang Liu,Pengwei Huo,Yongsheng Yan
To completely utilize the high redox ability of photo-induced charge carriers. Here, a Z-scheme photocatalyst of TiO 2 QDs/Bi 12 TiO 20 (TBT) composites with TiO 2 QDs fragment attached to the surface of Bi 12 TiO 20 (BTO) was prepared and the photocatalytic activity was evaluated by degradation of gatifloxacin (GF). The optimal photocatalytic performance of TBT displayed 3 times higher than bare BTO. The improved photocatalytic performance was ascribed to the effective separation of the charge carriers between TiO 2 QDs and BTO via the direct Z-scheme heterojunction . Such a strategy for the construction of Z-scheme TBT composites for removal of organic pollutants, proving new insights into design photocatalyst.
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
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Lele Zhou,Zhizhang Shen,Shuibing Wang,Junxian Gao,Lingling Tang,Ji Li,Yuming Dong,Zhenyu Wang,Jinze Lyu
We constructed quantum-scale catalytic regions on the surfaces of TiO 2 nanoparticles by loading TiO 2 quantum dots (QDs) with a two-step method. The removal rate and mineralization efficiency of toluene were measured and then used in evaluating the oxidation performance of the prepared samples. A home-built atmospheric surface photovoltage spectrometer and X-ray photoelectron spectrometer were used in analyzing band alignment across the interface between TiO 2 QD and TiO 2 particle and the transfer of charge carriers at the surface. Results showed that an upward band bending formed from the TiO 2 particle to the TiO 2 QD and promoted the accumulation of holes at the QD side. Moreover, the QD and surrounding substrate TiO 2 formed a quantum-scale catalytic region, improving the reaction probability of electron-hole pairs and corresponding intermediates. The mineralization efficiency of toluene in QD-loaded TiO 2 reached 95.8%. The synthetic method is green and simple, showing potential in scale production and industrial application.
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 POWER SOURCES
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2016
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IF 6.333
Yakun Tang,Lang Liu,Xingchao Wang,Dianzeng Jia,Wei Xia,Zongbin Zhao,Jieshan Qiu
TiO 2 quantum dots embedded in bamboo-like porous carbon nanotubes have been constructed through the pyrolysis of sulfonated polymer nanotubes and TiO 2 hybrids. The TiO 2 quantum dots are formed during the pyrolysis, due to the space confinement within the highly cross-linked copolymer networks. The sulfonation degree of the polymer nanotubes is a critical factor to ensure the formation of the unique interpenetrating structure. The nanocomposites exhibit high reversible capacity of 523 mAh g −1 at 100 mA g −1 after 200 cycles, excellent rate capability and superior long-term cycling stability at high current density , which could attain a high discharge capacity of 189 mAh g −1 at 2000 mA g −1 for up to 2000 cycles. The enhanced electrochemical performance of the nanocomposites benefit from the uniform distribution of TiO 2 quantum dots, high electronic conductivity of porous carbons and unique interpenetrating structure, which simultaneously solved the major problems of TiO 2 anode facing the pulverization , loss of electrical contact and particle aggregation.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Sheng Zhang,Zhang Lan,Jihuai Wu,Xin Chen,Caiyan Zhang
TiO 2 quantum dots (QDs) are synthesized and used to prepare thin films as novel blocking layers (TiO 2 -QD-BLs) at conductive glass/TiO 2 interfaces by spin coating method. The electron recombination at conductive glass/polysulfide electrolyte interfaces can be reduced significantly after the insertion of TiO 2 -QD-BLs in the photoelectrodes. The effects of different thickness of TiO 2 -QD-BLs on photovoltaic performance of CdS QDs sensitized solar cells are investigated. It is found that the cells with 641 nm thick TiO 2 -QD-BLs show the highest power conversion efficiency of about 3.66% under full sunlight illumination (100 mW cm −2 , AM 1.5 G), which is obviously higher than that of the cells without TiO 2 -QD-BLs in the photoelectrodes (1.99%).
研究领域:
材料科学
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纳米技术
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太阳能
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电化学
✓ 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）