SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Tao Wang,Xiqing Liu,Qiuyue Men,Wei Ma,Zhi Liu,Yang Liu,Changchang Ma,Pengwei Huo,Yongsheng Yan
In this work, a simple method to load of g-C 3 N 4 quantum dots (CN QDs) onto Bi 2 Ti 2 O 7 (BTO) microsphere with the amount of CN QDs (3, 7, 10 and 15%). The photocatalyst was used for the treatment of water pollutants under visible-light illumination, which proved that CNBTO composites showed improved photocatalytic activity matched up to pure BTO. Reformation of BTO with CN QDs enhanced the light assimilation capacity, and promoted the isolation of photo-induced electron-hole pairs. The trapping experiments and ESR were announced the holes (h + ) and superoxide oxide (O 2 − ) played the key role, and the relative mechanism of the photocatalytic process was proposed. Meanwhile, the effects of CN QDs content, pH and initial pollutant concentration on the removal efficiency of ciprofloxacin (CIP) were studied. Results showed that the CN QDs loaded on BTO presented higher photocatalytic efficiency, and an optimum value for the dosage of photocatalytic in pH 8.0.
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
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2021
·
IF 2.495
Yujing Ou,Junqing Shi,Quanqing Yan,Chunlei Li,Yi Zheng
Molten salt synthesis is an efficient method for preparation of photocatalyst. Enhancing precursor mixing effect is important. In this study, we found ethanol is important for synthsis of face-to-face type Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7 composite photocatalyst. The prepared Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7 (B3) composite under molar ratio of Bi:Ti of 4:3.6 displays higher photocatalytic activity compared with Bi 4 Ti 3 O 12 (B1) and Bi 2 Ti 2 O 7 (B4). The photocurrent density of B3 is 2 times higher than B1 and 1.6 times higher than B4, and B3 has smallest charge resistance between sample and solution. Combined with XPS, the study found that the higher photocatalytic activity origins from large charge transfer interface and built-in electric field (BIEF) around such interface, rathor than light absorption and dark adsorption.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 12
·6586-6591
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IF 7.443
Hongfei Shi,Huaqiao Tan,Wan-bin Zhu,Zaicheng Sun,Yuejia Ma,Enbo Wang
A series of Cr-doped Bi4Ti3O12/Bi2Ti2O7 (BTO) heterostructure fibers have been synthesized via a one-step, facile and economical electrospinning/calcination process. SEM and TEM results reveal that the diameters of the as-prepared fibers are 100 ± 30 nm. The light adsorption of Bi4Ti3O12 and Bi2Ti2O7 in the fibers has been remarkably improved by Cr doping. With increased Cr doping, XRD and XPS show that the amount of Bi2Ti2O7 increases in the fibers. As a result, the Bi4Ti3O12/Bi2Ti2O7 heterojunction structure is enhanced, which further promotes the charge separation of photogenerated charge carriers. Photocatalytic tests indicated that the as-prepared Cr-doped Bi4Ti3O12/Bi2Ti2O7 fibers exhibit good photocatalytic activity for photodegradation of methyl orange (MO) under visible-light irradiation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yidong Hu,Fan Yang,Guoliang Ren,Jianguo Li,Qiaodan Hu
Preparation of dense Bi 2 Ti 2 O 7 ceramics with single-phase pyrochlore structure is challenging using the conventional sintering method due to its thermal instability at ≥ 650 °C. Here we synthesized dense and phase-pure Bi 2 Ti 2 O 7 ceramics from a mixture of Bi 2 O 3 and TiO 2 by a novel deep undercooling rapid solidification method using the aerodynamic levitation technique. We reported a surprising discovery that the pyrochlore phase can exist with Bi/Ti ratio varying between 0.9 and 1.1. By a comprehensive investigation on the phase purity, crystal structure, oxidation states and electrical properties, we revealed that the pyrochlore structure is primarily stabilized by the solidification process rather than presence of a large amount of Ti 3+ . With the advantages of being containerless, one-step and fast processing, deep undercooling rapid solidification is an effective and efficient approach to prepare dense Bi 2 Ti 2 O 7 pyrochlores, and can be expanded to other thermally unstable compounds to obtain bulk materials.
研究领域:
材料科学
·
无机化学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2019
·Vol. 19
·期 12
·7635-7644
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IF 1.093
Rong Qianyun,Zhang Dapeng,Li Ying,Zha Zhenxing,Geng Xinxiang,Cui Shihai,Yang Jing
A novel Bi2MoO6/Bi2Ti2O7 heterojunction photocatalyst was firstly prepared by a simple solvothermal route. The as-synthesized photocatalysts were characterized by scanning electron microscopy, transmission electron microscopy, X-ray
diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence spectra. The effect of the material ratio, solution pH, and the salinity on glycolic acid degradation were discussed. The Bi2MoO6/Bi2Ti2O7
(2:1) nanocomposite exhibits highest photocatalytic performance and chemical stability. The glycolic acid degradation efficiency can reach 99.9% at pH 4 after 150 min irradiation under visible light. The enhanced photocatalytic activity can be ascribed to the heterojunction interface in the
composite, which is beneficial to the efficient charge carriers transfer. The degradation conforms to the pseudo-first-order kinetics. According to the oxidation species trapping experiments, the ·O2
−, h
+ and ·OH
are found to play important roles in the photocatalytic degradation and ·O2
− is the main active species. The possible photocatalytic mechanism was further discussed on account of valence band, conduction band positions and possible transition states.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Yuan Yan,Wenyuan Hu,Xinyu Xie,Yousef Faraj,Wulin Yang,Ruzhen Xie
Among various advanced oxidation processes, photo-Fenton like catalysis, which couples solar energy with Fenton-like catalysis to generate highly reactive species for wastewater decontamination, has attracted broad interests. However, photo-Fenton catalysts usually suffer from poor pH adaptability, metal leaching and photogenerated charge recombination. Herein, a novel defect-enriched Bi 2 Ti 2 O 7 /C 3 N 4 (BTO/CN) heterojunction is prepared via ball milling-thermal treatment method and used as a durable photo-Fenton like catalyst to degrade phenol in water. The BTO/CN heterojunction shows an excellent optical absorption capacity, and a superior e - -h + separation efficiency. With the addition of PMS, a micro-photo-electrolysis reactor can be formed in the BTO/CN, rendering it high photocatalytic activity, excellent tolerance to environmental condition and exceptional stability. The BTO/CN micro-photo-electrolysis reactor exhibits superior performance in phenol removal and excellent tolerance towards salt ions. Non-radical pathway and OH oxidation are demonstrated to contribute to phenol degradation in the BTO/CN heterojunction photo-Fenton-like system. The PMS can simultaneously boost the interfacial charge transmission from BTO to CN forming internal BTO photoanode and CN photocathode, leading to sustainable photocatalytic performance without secondary pollution. This work successfully demonstrates a feasible strategy to develop solar energy assisted Fenton-like catalyst for efficient water decontamination, which holds a great promise towards practical photo-Fenton water decontamination.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Dadao Wang,Jian Li,Zhifeng Xu,Yeran Zhu,Guoxin Chen
To improve the visible light utilization and adsorption capacity for combined pollutants (Tetracycline and Cu 2+ ), novel flower-like BiVO 4 /Bi 2 Ti 2 O 7 /Fe 3 O 4 composite has been successfully synthesized for the first time via a simple two-step process, surfactant-free hydrothermal route and solvothermal method . The crystal structures, chemical compositions , morphologies, optical and photocatalytic properties of the as-prepared samples were characterized by the techniques of XRD , XPS, SEM, HRTEM , BET, UV–vis DRS, and Photocurrent tests (PT). The synthetic sample with 4:1:20 (S5) mass ratio of BiVO 4 /Bi 2 Ti 2 O 7 /Fe 3 O 4 possessed the highest adsorption capacity and photocatalytic performance simultaneously in all of the as-prepared composites. Adsorption experiment (model 1 and model 2) suggested that there was not only competitive adsorption but also synergistic adsorption mechanisms between Cu 2+ and TC. Compared to pure BiVO 4 , and BiVO 4 /Bi 2 Ti 2 O 7 , BiVO 4 /Bi 2 Ti 2 O 7 /Fe 3 O 4 displayed more superior photodegradation efficiency with 97.22% removal of TC (10 mg/L) in 60 min, where the optimal conditions were catalyst dosage 1.00 g/L and initial pH at 6.0. In addition, radical trapping experiments revealed that the photo-induced active species superoxide radical ( O 2 − ) and holes (h + ) were the predominant active species in the photocatalytic system. These features demonstrate that the BiVO 4 /Bi 2 Ti 2 O 7 /Fe 3 O 4 has great application potential for combined pollutants’ removal 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
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Yu Liu,Tianyi Hu,Shufei He,Likui Feng,Qingliang Zhao,Junqiu Jiang,Liangliang Wei
Inspired by the high sustainability, energy saving, cleanliness of photocatalysis (PC) with respect to antibiotics decomposition, we developed a stable, highly efficient Bi 2 Ti 2 O 7 @Bi 2 S 3 /polyurethane (BTO@Bi 2 S 3 /PU) photocatalytic system. It exhibited the best degradation performance with the removal of 82.08 % oxytetracycline (OTC) within 180 min under the optimal reaction parameters. Systematic characterization of BTO@Bi 2 S 3 /PU revealed its wider light-harvest capacity, higher electron–hole (e − –h + ) separation efficiency, lower interface resistance, and better redox potential in heterojunction. Based on electrochemical characterization and density functional theory calculation, the construction of Z-scheme BTO@Bi 2 S 3 photocatalyst substantially optimized the band structure. Moreover, the redox cycles of Bi 3+ /Bi 5+ and Ti 4+ /Ti 3+ further enhanced the charge transfer rate during the photoactivation process. For the OTC photodegradation pathways, ·OH, h + , ·O 2 − , and 1 O 2 dominated the pollutant decomposition and the toxicity of intermediates were decreased. Overall, the BTO@Bi 2 S 3 /PU photocatalytic system may provide a universal and stable technique for advanced photoheterojunction applications and wastewater purification.
研究领域:
环境科学
·
材料科学
·
毒理学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Qiuhui Zhu,Reshalaiti Hailili,Yue Xin,Yingtang Zhou,Yu Huang,Xinzhu Pang,Ke Zhang,Peter K.J. Robertson,Detlef W. Bahnemann,Chuanyi Wang
Developing full-spectrum responsive and efficient photocatalysts is still an important challenge in the field of photocatalytic treatment of trace environmental pollutants. Herein, full-spectrum Bi@Bi 2 Ti 2 O 7 with rich-oxygen vacancies (OVs) were fabricated via a one-pot hydrothermal method. The optimized composite photocatalyst exhibited a photocatalytic efficiency of 79 %, more than doubled higher than that of its counterpart, Bi 2 Ti 2 O 7 (31.79 %), for removing ppb-level NO under visible-near infrared (Vis-NIR) irradiation. The enhanced photocatalytic performance was attributed to the co-effect of Bi and OVs reveal by control experiments and theoretical calculations, which not only benefited the adsorption and photocatalytic activation of NO but broadened light absorption to near infrared region. Furthermore, the adsorption and photocatalytic conversion pathway of NO was explored by in situ DRIFTS, suggesting that NO + as intermediate species is crucial to improve the selectivity of NO converting to nitrate. This work provides a new perspective of constructing full-spectrum-driven photocatalysts for environment remediation.
研究领域:
环境科学
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材料科学
·
光催化
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Qi Yuan,Yutong Meng,Sen Wang,Gaobin Liu,Qiyao Wang,Kuoming Song,He Zhao,Shuai Yan,Xin Li
The effects of different contents of B 2 O 3 -Bi 2 O 3 on the sintering temperature and dielectric properties of MgO-12%TiO 2 (w) ceramics were investigated. B 2 O 3 -Bi 2 O 3 addition effectively reduced the sintering temperature and improved the dielectric properties of ceramic samples; however, an excessive amount of B 2 O 3 -Bi 2 O 3 led to the deterioration of dielectric properties. This is because Bi 2 O 3 participated in the chemical reaction between MgO and TiO 2 and generated a high-dielectric-loss Bi 2 Ti 2 O 7 phase, resulting in an increased dielectric loss in the ceramic samples. In contrast, B 2 O 3 formed a liquid phase to fill the grain gaps and pores during sintering, improving the densities of the ceramic samples. An appropriate amount of B 2 O 3 -Bi 2 O 3 accelerated the reaction between MgO and TiO 2 and formed ultralow-dielectric-loss phases—MgTiO 3 and Mg 2 TiO 4 , and the dielectric losses of the ceramic samples decreased to an order of 10 −5 .
研究领域:
材料科学
·
电子材料
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 14.3
Yidong Hu,Fan Yang,Guoliang Ren,Jianguo Li,Qiaodan Hu
The effect of oxygen partial pressure ( p O 2 ) of the solidification atmosphere on the formation of single-phase Bi 2 Ti 2 O 7 prepared by deep undercooling rapid solidification was investigated. Comprehensive analyses on the solidification products showed that single-phase Bi 2 Ti 2 O 7 was highly sensitive to the presence of oxygen in the solidification atmosphere. At a low p O 2 of 1%, Bi 2 Ti 4 O 11 was identified as the secondary phase; at p O 2 of 5% and 10%, Bi 4 Ti 3 O 12 was observed as the secondary phase. The formation mechanisms of different types of secondary phases under various p O 2 were discussed from density functional theory calculations and solidification pathway analysis. Results from this work revealed the critical role of solidification atmosphere on the synthesis of single-phase Bi 2 Ti 2 O 7 by rapid solidification, and the findings might be expanded to the solidification of other metastable oxides.
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Xiqing Liu,Zhiping Zhou,Tao Wang,Changchang Ma,Yongsheng Yan
The modification of photocatalyst was the vital task for improving photocatalytic performance. Inspired by multi-level effect and activation regions of N atom, multi-level bismuth-based spheres (Bi2Ti2O7) and N-doped graphene quantum dots (N-GQD) were constructed for the photocatalytic application. Experiments demonstrated that the N-GQD/Bi2Ti2O7 multi-level spheres showed higher photocatalytic performance due to the multi-level effect and activation regions. Meanwhile, a series of characterizations proved that the separation efficiency of electron–hole pairs was improved after the N-GQD modifications. A possible mechanism was proposed for investigating N-GQD/Bi2Ti2O7 materials in the photocatalytic field.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）