CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lindun Zou,Chun Tian,Zhaoyang Lin,Yuquan Wang,Tianyi Gu,Zuchun Wang,Tao Tang,Hongqi Shi
The rampant misuse of organic dyes has exacerbated environmental pollution to an alarming degree. SrBi 4 Ti 4 O 15 , a layered perovskite semiconductor material, demonstrates considerable potential in the degradation of organic dyes, and efforts have been made to enhance its photocatalytic efficiency. In this study, La 3+ doping was utilized to synthesize SrBi 4-x La x Ti 4 O 15 (x=0, 0.10, 0.15, 0.25, 0.40) nanosheet photocatalysts, and their photocatalytic performance and underlying mechanisms were comprehensively investigated. XRD and Raman spectroscopy revealed that La 3+ doping replaced Bi 3+ at the A-site, resulting in a reduction of the interlayer spacing of [TiO 6 ] octahedra. Combined with DFT calculations, La 3+ doping was found to widen the band gap of SrBi 4 Ti 4 O 15 and raise the Fermi level. Additionally, La 3+ doping significantly increased the ratio of the Ti 3d component at the bottom of the conduction band, favoring the migration of photogenerated electrons along the [TiO 6 ] octahedra and accelerating the separation of photogenerated carriers. SEM and BET analyses revealed that La 3+ doping not only increased the size of the nanosheets but also significantly enhanced their specific surface area, thereby exposing more active sites. Degradation experiments of Rhodamine B (Rh B) under UV light demonstrated that the photocatalytic efficiency of SrBi 3.75 La 0.25 Ti 4 O 15 (k = 0.0514 min -1 ) was 2.66 times higher than that of the original SrBi 4 Ti 4 O 15 (k = 0.0193 min -1 ). The theoretical degradation pathway of Rh B was elucidated using LC-MS analysis and the developmental toxicity of potential intermediates was analyzed. Moreover, the SrBi 3.75 La 0.25 Ti 4 O 15 photocatalyst also exhibited excellent degradation efficacy against Methylene Blue (MB), Crystal Violet (CV), and Methyl Orange (MO). This study provides both theoretical and experimental insights into improving the photocatalytic performance of SrBi 4 Ti 4 O 15 , thereby enhancing its potential for industrial application.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Longbin Chen,Pengqi Hai,Yaodong Yang,Chao Wu,Yongming Hu,Wei-Feng Rao
Combining metal with ferroelectrics is one of the reliable strategies to enhance the photocatalytic water splitting of ferroelectrics dramatically. However, the metal loading ratio is directly related to the synergistic effect of catalysts. In order to find the appropriate loading of Pt, we fabricated SrBi 4 Ti 4 O 15 (SBTO) nanosheets (NSs) and deposited different amounts of Pt nanoparticles (NPs) to form heterojunction. The optoelectronic characterizations verified that the Pt-modified SBTO NSs have broadened absorption of visible light; produce more long-lived charge carriers. The photocatalytic hydrogen production can reach 11700 μmol g −1 under continuous illumination for 3 h from the sample containing 6 wt% Pt, showing a much higher hydrogen evolution rate than other ferroelectric materials under similar reaction systems. Our work provides a valuable and feasible solution to produce hydrogen from water.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Tiancheng Hou,Longbin Chen,Yaodong Yang,Jialong Wang,Tianzi Yang,Wei-Feng Rao
The mechanical vibration-assisted piezoelectric catalytic water splitting for hydrogen production is a promising approach to address the energy crisis. However, most piezoelectric catalysts used for hydrogen production are limited by their high cost, low stability, and unsatisfactory hydrogen production rates. To overcome these problems, we employed a co-catalyst (CdSe) to enhance the catalytic performance of SrBi4Ti4O15. Notably, the composite catalyst achieved a hydrogen production rate of 21 mmol g−1 h−1, which is 10 times higher than that of pure SrBi4Ti4O15. This catalyst has the advantages of a high hydrogen production rate, good stability, and low cost, providing a more effective method for the design and synthesis of piezoelectric catalysts for water-based hydrogen production and laying a foundation for large-scale piezoelectric catalytic water splitting for hydrogen production in the future.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 4
·1785-1796
·
IF 3.502
Jianqiang Bi,Tong Wei,Linghui Shen,Fengming Yang,Chuanzhen Zhao,Mingchao Wang,Qiqian Yang,Yuxuan Lin
Upconversion (UC) luminescence modulation is quite important in controlling and processing light for active components of light sources, photoswitches, optical memories, and optical sensing devices. In this work, we reported one kind of novel phosphor, Ho 3+ /Yb 3+ -doped SrBi 4 Ti 4 O 15 ceramics, which displayed both strong UC luminescence and obvious photochromic (PC) reaction. The UC luminescence, PC effect, and the modulation of UC performance based on PC behavior were investigated in detail. By alternating visible light irradiation and thermal stimulus, the UC luminescence could be reversibly regulated. Meanwhile, the modulation was unveiled to tightly rely on the irradiation time and thermal treatment processes. Excellent reproducibility was also achieved. In addition, as an alternative method to thermal treatment, the manipulation of luminescence by electric field was also explored. Finally, the mechanism related to the UC luminescence manipulation was illustrated. The results indicate that these samples could be potentially utilized in optical data storage and anti-counterfeiting security fields.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
·
2024
·Vol. 41
·期 3
·798-808
·
IF 1.8
Shengyi Liu,Duan Gao,Li Wang,Wenbin Song,Zhiliang Zhang,Shitao Wang,Ying Zhu,Qi Zhang
${{\rm Er}^{3 +}}/{{\rm Yb}^{3 +}}$ co-doped ${{\rm SrBi}_4}{{\rm Ti}_4}{{\rm O}_{15}}$ crystalline powders were synthesized using the high-temperature solid-phase method. The crystal structure of the obtained phosphors was analyzed through x-ray diffraction (XRD), confirming the purity of all products such as ${{\rm SrBi}_4}{{\rm Ti}_4}{{\rm O}_{15}}$. Employing experimental design optimization theory, regression equations were established to correlate the ${{\rm Er}^{3 +}}/{{\rm Yb}^{3 +}}$ doping concentrations with the luminescent intensities. The genetic algorithm was utilized to compute the optimal solutions of the equations, resulting in ${{\rm Er}^{3 +}}$ and ${{\rm Yb}^{3 +}}$ doping concentrations of 3 mol% (molar fraction) and 20 mol% under 980 nm laser excitation and 3 mol% and 29.79 mol% under 1550 nm laser excitation. The up-conversion fluorescence emission spectra of the samples were measured under 980 nm excitation, revealing intense green emissions at 525 nm, 550 nm, and 662 nm, corresponding to the $^2{{\rm H}_{11/2}}{\to}{^4}{{\rm I}_{15/2}}$, ${^4}{{\rm S}_{3/2}}{\to}{^4}{{\rm I}_{15/2}}$, and $^4{{\rm F}_{9/2}}{\to}{^4}{{\rm I}_{15/2}}$ energy levels, respectively. Under 1550 nm excitation, peaks corresponding to the same energy levels were observed at 523 nm, 548 nm, and 661 nm. The relationship between the up-conversion fluorescence and the laser operating current for the optimal samples under 980 nm and 1550 nm excitations was explored, indicating two-photon and three-photon processes, respectively. Detailed analysis and discussion of the up-conversion fluorescence mechanisms were conducted. Additionally, the relationship between the up-conversion fluorescence and the temperature for the optimal samples was investigated, revealing excellent temperature sensing characteristics under 980 and 1550 nm laser excitations. The CIE coordinates for the optimal samples were calculated as (0.3111, 0.6747) and (0.5254, 0.4671) under 980 nm and 1550 nm excitations, respectively.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hongqi Shi,Chun Tian,Shanshan Wang,Jiajun Fang,Xingguo Xu,Xinnian Guo
Residual antibiotics in aquatic environments pose significant ecological challenges. Photocatalytic oxidation technology is highly effective in eliminating these contaminants. The layered perovskite semiconductor SrBi 4 Ti 4 O 15 (SBTO) exhibits exceptional photocatalytic potential due to its stability and robust oxidative capacity. However, its wide bandgap and rapid recombination of photogenerated carriers limit its efficiency. To address these limitations, we developed a CdSe quantum dot/SrBi 4 Ti 4 O 15 (CS/SBTO) composite. The results show that CdSe quantum dots are uniformly distributed on SBTO nanosheets, increasing the specific surface area and extending visible light absorption. The formed Z-scheme heterojunction significantly enhances photocatalytic degradation efficiency, achieving a degradation rate 6.5 times higher than that of SBTO alone. Radical trapping experiments indicate the involvement of holes, hydroxyl radicals, and superoxide radicals in the reaction. Cycling tests demonstrate the composite's good stability. The degradation pathway was elucidated based on intermediates detected by HPLC-MS. This study provides a foundational basis for developing efficient photocatalytic water purification technologies.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Kai Wang,Xiaojiao Yu,Fan Yang,Zongbin Liu,Ting Zhang,Jinfen Niu,Binhua Yao
p–n heterojunction composites with high-charge-transfer efficiency have attracted considerable attention owing to their unique structure and interface interactions. Herein, a novel Z-scheme Cu 2 O/SrBi 4 Ti 4 O 15 p–n heterojunction was successfully constructed using the microwave hydrothermal method for DOC removal under visible light irradiation. The structure, composition, and photoelectric chemical properties of Cu 2 O/SrBi 4 Ti 4 O 15 nanocomposites were studied. The composites exhibited high photocatalytic activity for DOC, and 92.2% of DOC was decomposed within 60 min, which is 9.2 and 5.2 times higher than those of original Cu 2 O and SrBi 4 Ti 4 O 15 , respectively. The extraordinary degradation performance can be attributed to the formation of Z-scheme heterostructure. On the one hand, a unique interface structure can significantly enhance the number of active sites on the catalyst surface. On the other hand, Z-scheme heterostructure can accelerate generation and migration of the photoinduced carriers. Furthermore, the effects of operational parameters such as catalyst dosage, initial concentration, inorganic salts, and water sources, were investigated. Finally, a photodegradation mechanism of Z-scheme Cu 2 O/SrBi 4 Ti 4 O 15 p–n heterojunction for DOC was proposed.
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
ACS ES&T Engineering
·
2022
·
IF 0
Qiuhui Zhu,Afzal Ahmed Dar,Yingtang Zhou,Ke Zhang,Jiani Qin,Bao Pan,Jingqi Lin,Antonio Otavio T. Patrocinio,Chuanyi Wang
Polarization in noncentrosymmetric materials contributes to the improvement in photocatalytic activity by inhibiting the recombination of photogenerated charge carriers; thus, enhancing polarization becomes an effective way to further improve the photocatalytic efficiency of a photocatalyst. Herein, as a case of study, the piezoelectric coefficient and potential of SrBi4Ti4O15 prepared by a molten salt method (SBT-850) were improved by 4.9 and 2.7 times compared to those of its counterpart prepared by a solid-state reaction (SBT-SSR), respectively. The experimental investigations and theoretical calculations evidence that the oxygen vacancies in the {001}-dominated facets could improve the internal polarization of SBT-850. Piezo- and photocoupled catalysis of SBT-850 is employed to improve the efficiency of photocatalytic degradation and mineralization of tetracycline under the synergy of visible light and ultrasound. The oxidation rate constant under the synergistic stimulation reaches 0.058 min–1, which is 2.15 and 14.5 times higher than that under visible light irradiation or ultrasound only, respectively. Furthermore, the synergistic stimulation promotes the generation of photocatalytic reactive oxygen species, which play an important role in the photocatalytic oxidation of tetracycline. The piezo-photocatalytic decomposition pathway of tetracycline is proposed based on the HPLC-MS analysis and theoretical calculations. This study sheds light on the rational design of oxygen vacancy-based microstructures to enhance the piezo-photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
化学
·
纳米技术
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jialong Wang,Longbin Chen,Yaodong Yang,Tiancheng Hou,Wei-Feng Rao
Piezoelectric catalytic seawater hydrogen production is one of the most crucial and potential hydrogen production strategies. However, the low surface activity and the high carrier recombination rate limit the further improvement of catalytic efficiency. To solve this problem, we prepared SrBi 4 Ti 4 O 15 (SBTO) and FeS 2 (FS) heterojunctions, which can effectively utilize the valence state transformation cycle between Fe 2+ and Fe 3+ to improve the surface activity and maintain carrier separation. This mechanism of Fe 2+ and Fe 3+ conversion is similar to the well-known Fenton reaction. It was confirmed by electrochemical measurements that with the help of FeS 2 , SBTO possessed a stronger piezoelectric current response and faster carrier transfer rate. Piezoelectric catalytic seawater splitting H 2 evolution rate of SBTO-25 %FeS 2 could reach 31 mmol g -1 h −1 , which is higher than that of other piezoelectric materials in similar conditions. Our findings provide valuable insights for further improving the efficiency of seawater hydrogen production efficiency.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Huifeng Yuan,Jianting Li,Wei-Feng Rao,Shuo Qu,Guiqi Gao,Hou Tiancheng,Yaodong Yang
The synergistic coupling of piezoelectric catalysis and photocatalysis can significantly enhance hydrogen production efficiency. However, developing high-performance catalysts with both high piezo/photo-response remains a key challenge. In this study, Palladium nanocrystals (Pd-NCs) have been deposited on the surface of SrBi4Ti4O15 (SBTO), resulting in the successful construction of an efficient hydrogen evolution catalyst based on the synergistic effect of piezo-photocatalysis.Under simultaneous illumination and ultrasound, SBTO-Pd-10% exhibited a hydrogen evolution rate of 27.6 mmol g -1 h -1 , representing an eleven-fold enhancement relative to pure SBTO. The enhanced performance can be attributed to the incorporation of Pd-NCs, which extends the visible light absorption spectrum of SBTO-Pd composite, improves conductivity, and introduces additional catalytic sites, thereby promoting efficient charge carrier separation. Additionally, ultrasonic effect induced an internal piezoelectric field that further inhibited photogenerated carrier recombination, resulting in a significant enhancement of performance. This study reveals the synergistic catalytic mechanism of coupled piezo-photocatalytic system, which provides a feasible pathway for the future design of highly efficient hydrogen production catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yaodong Yang,Shuo Qu,Guiqi Gao,Huifeng Yuan,Jialong Wang,Wei-Feng Rao,Jianting Li,Yanxi Li
Catalytic systems that couple pollutant degradation with hydrogen evolution have attracted attention due to their potential to simultaneously address two key challenges. To achieve this goal this paper studies a piezoelectric-driven synchronous redox system that realizes a synergistic effect of organic pollutant degradation and hydrogen generation—effectively producing hydrogen from the decomposition of organic wastewater. By in-situ growing Bi 2 S 3 on SrBi 4 Ti 4 O 15 (SBTO), a SBTO@Bi 2 S 3 heterojunction is formed, the interfacial contact between the two phases is optimized, significantly enhancing the overall catalytic performance in both pollutant degradation and water splitting for hydrogen production. Using methylene blue (MB) as an organic pollutant substitute for conventional hydrogen evolution sacrificial agents (e.g., methanol), the SBTO@Bi 2 S 3 catalyst achieves both efficient MB degradation and a hydrogen evolution rate of up to 3.28 mmol g −1 h −1 . Mechanistic studies indicate that methylene blue (MB) can effectively capture holes during its efficient degradation, suppressing electron-hole recombination and simultaneously promoting proton reduction to generate hydrogen. Meanwhile, electron consumption during hydrogen evolution also mitigates electron-hole recombination, further enhancing MB degradation and establishing a mutually reinforcing cycle. This work fills an important gap in the field of piezocatalysis by demonstrating a coupled process of wastewater remediation and hydrogen evolution, offering a new strategy for both environmental restoration and sustainable energy production.
研究领域:
材料科学
·
环境催化
·
能源化学
·
纳米材料
·
物理化学
✓ 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）