Nanoscale
·
2013
·Vol. 5
·期 20
·9764-9772
·
IF 6.233
Dongfang Hou,Xianluo Hu,Pei Hu,Wei Zhang,Mingfei Zhang,Yunhui Huang
A novel p–n junction photocatalyst of Bi4Ti3O12 nanofibers–BiOI nanosheets has been fabricated through a simple and economical technique of electrospinning combined with a successive ionic layer adsorption and reaction (SILAR) process. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (DRS), and photoluminescence (PL) spectroscopy. The as-formed Bi4Ti3O12 nanofibers are composed of inter-linked nanoparticles of 50–80 nm in size. The thickness of the as-grown BiOI nanosheets is about 10 nm and the size of the BiOI nanosheets increases with the SILAR cycles. In particular, many {001} facets of BiOI nanosheets are exposed, which is favorable to enhance the visible-light photocatalytic activity. The p–n junction photocatalyst exhibits enhanced visible-light-driven photocatalytic activity for decomposition of rhodamine B (RhB) and phenol. The enhanced photocatalytic activity can be attributed to the extended absorption in the visible light region resulting from the BiOI nanosheets and the effective separation of photogenerated carriers driven by the photo-induced potential difference generated at the Bi4Ti3O12–BiOI p–n junction interface.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xianying Wang,Yingshu Wang,Meichao Gao,Jinni Shen,Xipeng Pu,Zizhong Zhang,Huaxiang Lin,Xuxu Wang
Construction of composite semiconductors is an effective solution to elevate the efficiency of photocatalysis by prolonging lifetime of photogenerated hole and electrons. Herein, a heterojunction structure composite BiVO 4 /Bi 4 Ti 3 O 12 was synthesized via a facile in situ hydrothermal condition. The novel composite photocatalyst has excellent photocatalytic ability to reduce CO 2 with H 2 O into CH 3 OH and CO. The BiVO 4 /10 % Bi 4 Ti 3 O 12 sample shows the highest yields of CH 3 OH and CO up to 16.6 and 13.29 μmol g −1 h −1 , which was 12.39 and 5.68 times higher than that of pure BiVO 4 , and 9.88 and 2.80 times higher than that of pure Bi 4 Ti 3 O 12 , respectively. Such a high activity is attributed to the type II heterojunction structure which significantly enhances separation of photogenerated carriers and promotes collaboration between the water oxidation on the Bi 4 Ti 3 O 12 and the CO 2 reduction on BiVO 4 . The photocatalytic reaction mechanism of CO 2 on the composite was proposed according to experiment results.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2019
·
IF 5.04
Meng-Jie Chang,Wen-Na Cui,Jun Liu,Kang Wang,Hui-Ling Du,Lei Qiu,Si-Meng Fan,Zhen-Min Luo
TiO 2 /Bi 4 Ti 3 O 12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations. However, the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity. Herein, a robust methodology to construct novel TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 core/shell structures as visible light photocatalysts is presented. Homogeneous bismuth oxyiodide (BiOI) nanoplates were immobilized on electrospun TiO 2 nanofiber surface by successive ionic layer adsorption and reaction (SILAR) method. TiO 2 /Bi 4 Ti 3 O 12 core/shell nanofibers were conveniently prepared by partial conversion of TiO 2 to high crystallized Bi 4 Ti 3 O 12 shells through a solid-state reaction with BiOI nanoplates, which is accompanied with certain transition of TiO 2 from anatase to rutile phase. Afterwards, MoS 2 nanosheets with several layers thick were uniform decorated on the TiO 2 /Bi 4 Ti 3 O 12 fiber surface resulting in TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 structures. Significant enhancement of visible light absorption and photo-generated charge separation of TiO 2 /Bi 4 Ti 3 O 12 were achieved by introduction of MoS 2 . As a result, the optimized TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 -2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO 2 /Bi 4 Ti 3 O 12 . This synthetic method can also be used to establish other photocatalysts simply at low cost, therefore, is suitable for practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 10
·6574-6582
·
IF 3.5
Weiping Gong,Duoduo Zhang,Lang Xiao,Jiahui Zhao,Ting Wang,Kai Li,Zhentin Zhao,Manuel Scharrer,Alexandra Navrotsky
The Aurivillius compounds in the Bi 2 O 3 –Fe 2 O 3 –TiO 2 system, combining ferroelectric, semiconducting, and ferromagnetic properties, have attracted particular interest. Formation kinetics and thermodynamic stability are the fundamental knowledge needed for modeling and predicting the temporal microstructure and property evolution during materials processing but have not yet been addressed by quantitative experimental measurement. This article focuses on the Bi n +1 Fe n –3 Ti 3 O 3 n +3 Aurivillius compounds on the Bi 4 Ti 3 O 12 –BiFeO 3 tie-line to elucidate the mechanisms and thermodynamic controls responsible for phase formation of compounds with various perovskite-like layers. Five high-purity Aurivillius compounds Bi 4 Ti 3 O 12 , Bi 5 FeTi 3 O 15 , Bi 6 Fe 2 Ti 3 O 18 , Bi 7 Fe 3 Ti 3 O 21 , and Bi 8 Fe 4 Ti 3 O 24 with integer n = 3–7 values were synthesized and their phase transformation properties and enthalpies of formation were studied by X-ray diffraction in situ, high temperature differential scanning calorimetry, and high temperature oxide melt solution calorimetry. Thermodynamic stability of the compounds decreases with increasing n , and formation kinetics gradually slow down, demonstrating the inherent difficulty to synthesize pure Aurivillius compounds with n larger than 8. This difficulty was confirmed by an impurity phase coexisting with Bi 9 Fe 5 Ti 3 O 27 .
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Ting Zhang,Xingzhi Jin,Quanqing Yan,Shujie Zhao,Yi Wang,Yi Zheng,Chunlei Li
The first case of nitric acid-activated Bi 4 Ti 3 O 12 (BTO) has been investigated. The activity of 1% molar ratio nitric acid-activated Bi 4 Ti 3 O 12 (BTO-1) is 22.8 times, 2 times, and 2 times higher than BTO on photodegradation of rhodamine B (RhB), tetracycline hydrochloride (TC), and Cr (VI) solution, respectively. The excellent improvement of the photo-redox reaction is due to the simultaneous removal of Na + and the creation of oxygen vacancies on the photocatalyst surface, which can improve the transport and separation efficiency of the photocarrier. In addition, BTO-1 has excellent photostability. This study may provide a general approach to improve the photocatalytic properties of titanates synthesized by the hydrothermal method with NaOH.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Shunhang Wei,Yuxing Chen,Pingru Wu,Xingen Liu,Jun Ren,Bo Yao,Haitao Xu,Weidong Dou,Yawei Wang,Rong Wu,Zebo Fang,Qifeng Liang
Surface defects have a significant effect on the photocatalytic reaction of Bi 4 Ti 3 O 12 , but the mechanism is unclear. In addition, when surface defects and highly exposed facets exist at the same time, which factor plays the main role in photocatalytic activity is also controversial. Herein, it is found that Bi 4 Ti 3 O 12 with adjustable concentrations of surface defects and percentage of exposed {001} facets can be prepared by using titania of different crystal types and sizes as raw materials, which is extremely beneficial for exploring the above problems. The photocatalytic activity of Bi 4 Ti 3 O 12 nanosheets with surface defects and exposed {001} facets was the same as that of Bi 4 Ti 3 O 12 nanosheets with surface defects alone (about 72.5% of photodegradation levofloxacin under 10 min of simulated sunlight irradiation). Based on the experimental results and density functional theory calculations, the influence mechanism of surface defects was deeply studied. The surface defects resulting from partial exfoliation of the external (Bi 2 O 2 ) 2+ layers changed band structure of Bi 4 Ti 3 O 12 . More importantly, surface defects with high concentration became hole trapping sites, which was conducive to the faster participation of holes in the photocatalytic oxidation process.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Juan Wang,Yuxing Shi,Haoran Sun,Weilong Shi,Feng Guo
Photocatalytic hydrogen production from water splitting is a technology that takes advantage of solar energy to produce clean and green hydrogen energy with wide application prospects. Herein, an S-scheme heterojunction photocatalyst with a nanosheets-on-nanosheets structure was successfully prepared by using a simple low-temperature water bath method and ZnIn 2 S 4 nanosheets are generated in situ on Bi 4 Ti 3 O 12 nanosheets, realizing efficient photocatalytic produce hydrogen under visible light irradiation. The optimal proportion of Bi 4 Ti 3 O 12 /ZnIn 2 S 4 (BTO/ZIS) has extraordinary hydrogen production efficiency of 19.8 mmol h −1 g −1 , 2.1 times that of pristine ZIS (9.2 mmol h −1 g −1 ). The main reasons for the improved activity of BTO/ZIS heterojunction photocatalysts are investigated by a series of photochemical characterization data analyses. Finally, its high photocatalytic performance can be attributed to more reactive active sites provided by the sheet-sheet heterostructure and the formation of S-scheme heterojunction between BTO and ZIS, which promotes the transfer of photogenerated electron-hole pairs.
研究领域:
材料科学
·
能源科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 5
·3104-3118
·
IF 3.094
Xiang Lv,Zhengyi Zhang,Zhiqiang Cao,Wei Jiang,Lifen Shi,Xiaojuan Zhao,Liyun Ma,Tianhe Wang,Shou Peng
A stable and translucent Bi@Bi 4 Ti 3 O 12 /TiO 2 film was fabricated on conventional glass substrates for the first time. The film exhibited a good photocatalytic performance and efficient self-cleaning capability against organic dyes under full spectral irradiation and visible light irradiation. Bi 4 Ti 3 O 12 /TiO 2 film was first prepared on a glass substrate with colloidal silica as a high temperature binder, followed by implantation of nanoscale Bi in it by an in-situ partially reduction of Bi 4 Ti 3 O 12 to generate Bi@Bi 4 Ti 3 O 12 /TiO 2 films. The improved photocatalytic ability is probably attributed to the surface plasmon resonance of Bi atom as well as the enhanced electron transfer efficiency and synergistic effect of Bi 4 Ti 3 O 12 and TiO 2 . According to trapping experiments, hydroxyl radicals (OH) were active species in the photocatalytic degradation of dyes under full spectral light irradiation and possible photocatalytic mechanism was proposed. The film prepared in this work may well have potential practical applications in many aspects, such as cleansing treatments for high building external decorative panels and also systematic characterization of the film suggests that the in-situ reduction is an effective and simple way to produce nanoscale Bi@Bi 4 Ti 3 O 12 .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2024
·
IF 1.4
Ze Cheng,Fuxiao Zhu,Bihui Jin,Zhenhua Hou,Hongbin Li,Gongliang Zhang,Hongman Hou,Jingran Bi,Shuang Yan,Hongshun Hao
Photocatalytic technology has been widely studied, discussed, and tested as a feasible wastewater degradation technology. The present study demonstrated the preparation of g-C 3 N 4 material using solid-state sintering method and the construction of Bi 4 Ti 3 O 12 /g-C 3 N 4 heterostructure via hydrothermal method. This direct contact Z-type heterojunction improves the wide bandgap of Bi 4 Ti 3 O 12 monomer, enhances its photoresponsiveness, and thus improves its photocatalytic performance. During the process of photocatalytic experiments, an environment of cold and hot fluctuations were created, and the pyroelectric effect was utilized to induce self-polarization of the material and formed an internal electric field. It improves the transport ability of electron–hole pairs and suppresses their recombination in the transport path. According to the degradation experiment results, the degradation efficiency of pyroelectric synergistic heterojunction photocatalysis reached 88.7%, which was 2.27 times that of Bi 4 Ti 3 O 12 . It proves that the photocatalysis by pyroelectric synergistic heterojunction has good application prospects.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jiahe Zhai,Hui Wang,Abdelkader Labidi,Long Zeng,Yu Huang,Chuanyi Wang
Removing low-concentration NO in the air by means of photocatalytic technology is a promising approach. Herein, our work pins down the mechanism of cobalt metal doping within the lattice of Bi 4 Ti 3 O 12 (BTO) for the photocatalytic NO conversion. As a result, the Co-BTO exhibits a NO conversion efficiency of 58.3 %, which is substantially higher than that of BTO (30 %). More interestingly, the Co-BTO also shows a lower production of intermediate NO 2 than that of the BTO. These findings demonstrate that within Co-BTO, both Co²⁺ and Co³ ⁺ coexist. The redox cycle between these two cobalt species engenders active sites possessing strong reducing capabilities for O₂ which can be adsorbed and activated at the Co sites, thereby generating superoxide radicals (•O₂⁻). Furthermore, the doping of a certain portion of cobalt broadened light absorption and enhanced the separation efficiency of photogenerated carriers, further facilitating the activation of O₂. Lastly, electron spin resonance (ESR) and in-situ diffuse reflective infrared Fourier transform spectroscopy (in-situ DRIFTS) were respectively utilized to further clarify the active species involved in the photocatalytic oxidation of NO and its adsorption and conversion pathways from a mechanistic standpoint. Overall, this work represents a novel endeavor for the advancement of visible-light-driven photocatalysts usage for environmental remediation against NO pollution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhihao Liang,Rongxia Huang,Tianbao Xie,Yi Zhang,Hua-Tay Lin,Yejing Dai
Bi 4 Ti 3- x (Mn 1/3 Ta 2/3 ) x O 12 piezoelectric ceramics were prepared by conventional sintering and direct-reaction sintering in this study. The effect of B-site Mn/Ta co-substitution and sintering method on the microstructure and electrical properties of Bi 4 Ti 3- x (Mn 1/3 Ta 2/3 ) x O 12 piezoelectric ceramics was systematically investigated. The experimental results show that the combination of high-valent Ta and low-valent Mn ions replacing Ti 4+ ions reduce the concentration of oxide vacancy defects in BITMT ceramics. The direct-reaction sintering is a simpler preparation method and the prepared samples have more uniform grain distribution and higher density. The resistivity of the direct reaction sintered sample with x = 0.05 at 500 °C is 7.19 × 10 5 Ωcm, the residual polarization is 8.1 μC/cm 2 , and the temperature stability of the piezoelectric constant is good. Therefore, the present study suggests that the piezoelectric properties of Mn and Ta co-doping of BIT ceramics could be greatly enhanced via the direct-reaction sintering, which provides a promising alternative to the conventionally sintered for a more cost-effective preparation for BIT ceramics.
研究领域:
材料科学
·
电子材料
✓ 已验证
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·889
·
IF 4
Lijun Xue,Yuxuan Wang,Chenhui Qiu,Hui Wan
Developing highly efficient photocatalysts for CO2reduction remains a great challenge. The large band gap and poor charge carrier dynamics are the major factors limiting the performance of Bi4Ti3O12(BTO). Herein, a series of La-doped Bi4Ti3O12(BLaxTO) nanosheets were synthesized and further modified by NaBH4hydrogenation to create surface defect-rich H-BLaXTO nanosheets. Characterizations and theoretical calculations confirmed that the synergistic effect of La doping and hydrogenation significantly enhanced visible-light absorption, promoted charge separation, and improved the electron reduction capacity. When applied to photocatalytic CO2reduction, the H-BLa0.2TO catalyst achieved a superior CH3OH production rate of 7.90 μmol·g−1·h−1, which is 5.6 times higher than that of pristine Bi4Ti3O12. Moreover, the H-BLa0.2TO catalyst maintained excellent stability over four consecutive cycles. This study offers an integrated strategy for constructing high-performance bismuth-based photocatalysts through elemental doping and defect engineering.
研究领域:
材料科学
·
光催化
·
环境化学
·
能源化学
·
纳米材料
·
表面科学
✓ 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）