Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 3
·671-685
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IF 5.819
Juan Cui,Jianghui Liu,Xunfeng Xia,Xu Chai,Huahua Guo,Jianfeng Gao,Shengwang Gao
A porous carbon quantum dots (CQDs)–SrTiO3/graphene material (CSG) was synthesized using a novel sol–gel carbonized propagation method (SCPM). In this method, the prepared gel was first immersed in an organic solvent with low-temperature self-propagating properties, and after being ignited, the product is obtained through carbonized propagation processes. Various characterization studies showed that CQDs, SrTiO3 and graphene can be combined through the SCPM, and CQDs and SrTiO3 form a heterojunction on the surface of the material, which is conducive to the recovery of the photocatalyst and improvement of the photocatalytic performance. The existence of a reducing atmosphere resulted in the occurrence of the doping process of CQDs. Photocatalytic degradation experiments showed that, with the increase of ethanol consumption, the catalytic performance tends to be stable. CSG-5, which consumes 80 mL of ethanol, has the best effect on MB degradation. When the dosage is 1.5 g L−1 and the concentration of MB is 5 mg L−1, the degradation rate is 94%. h+ and ˙O2− played a major role in the degradation system of CSG-5. UPLC-MS/MS results showed that 8 kinds of intermediates were produced during the degradation process. The special structure and preparation method of CSG-5 might help to prepare better photocatalysts.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiaqi He,Li Chen,Jinming Huang,Mingwei Li,Ju Zhou,Yihua Yue,Jiao Han,Yiming Zeng
This study investigates the dielectric properties of Sr 0.985 Lu 0.01 Ti 1- x Ta x O 3 ceramics co-doped with Lu and Ta as dual-donor, which were prepared using a solid-state method and sintered in a nitrogen atmosphere. The XRD results demonstrate that the dual-donor doping of Lu and Ta at Sr and Ti sites, respectively, which will improve the dielectric properties. The optimal dielectric properties were observed when x = 0.01, which the permittivity reaching approximately 220,000 and the dielectric loss is around 0.02. Through XPS and defect chemical analysis, it has been identified that the formation of point defects including , , and Ti 3+ will be produced by sintering in N 2 -atmosphere and the dual-donor doped of Lu 3+ and Ta 5+ . These point defects aggregate into dipole clusters, such as Ti 3+ Ti 3+ , and Ti 3+ , resulting in enhanced EPDD effect and reduced dielectric loss. This work provides valuable insights into the design of advanced dielectric materials with colossal permittivity.
研究领域:
材料科学
·
电子材料
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shengxin Cao,Xiaozhou Ye,Huiru Hu,Haoran Jin,Yun Wang,Jianfeng Ye
Mesoporous anatase TiO 2 sphere based materials has long been the focus of intensive research dealing with environmental-related issues due to their significant advantages in terms of structural isotropy, high surface area, structural stability, and low cost. However, in most cases, the employed mesoporous anatase spheres were comprised of nanocrystalline subunits with random crystalline orientations, which means that numerous grain boundaries exist in the sphere-shaped particles, suppressing their performance in various applications. Herein, by using mesocrystalline anatase submicrospheres that were synthesized via utilizing SO 4 2- ions to modulate the growth dynamics of anatase crystals in the green mixed solvents of PEG-400 and H 2 O as both template and reactant, novel sphere-shaped anatase mesocrystal/SrTiO 3 nanodot heterostructures were successfully produced. These spherical anatase mesocrystal/SrTiO 3 heterostructures exhibited noticeably enhanced activity toward reduction of hexavalent chromium (Cr VI ) under stimulated solar light irradiation, which was largely attributed to their favored adsorption of Cr VI , bolstered photogenerated charge carrier separation and well-preserved reduction capability due to the construction of a well-defined type-II heterojunction with tight interfacial contacts and strong interactions. This work will be useful for the designed fabrication of micro/nanostructured TiO 2 based photocatalysts with complex spherical morphologies for photocatalytic applications in environmental purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Lianqing Yu,Yanxing Liu,Lijie Duan,Yaping Zhang,Liana Alvares Rodrigues,D. Amaranatha Reddy,Haifeng Zhu
Construction of heterojunctions has been shown to be one of the most promising methods for the preparation of highly efficient catalysts, because it is feasible and effective for the separation of electron-hole pairs, prolonging the lifetime of photogenerated electrons. In this study, TiO 2 was grown on fluorine-doped tin oxide glass (FTO), and then a strontium source was added to obtain heterojunctions between SrTiO 3 and TiO 2 using in-situ ion exchange hydrothermal method. The in-situ grown SrTiO 3 /TiO 2 (TST) composite has a better absorption performance, a narrower band gap, and a lower carrier recombination rate compared to the pure TiO 2 sample, which improves the photoelectrochemical performance. The photocurrent density of TST-10 (hydrothermally treated for 10 h) has the largest value of 0.06 mA·cm −2 , which is about three times higher than that of pure TiO 2 . Then, the first-principles density functional theory (DFT) calculation was used to further explore the photocatalytic mechanism of TST. The exchange correlation energy was based on the Generalised Gradient Approximation (GGA) with Perdew–Burke–Ernzerhof (PBE) functional calculation method to study the electronic and optical properties of SrTiO 3 /TiO 2 heterostructures. The results show that the carrier transfer rate and the optical absorption coefficient of the material increase significantly after the establishment of the in-situ heterojunction. This study offers insight into the heterostructures’ interface significance on photocatalytic activity.
研究领域:
材料科学
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光催化
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xuelei Chen,Liming Zhang,Qiufen Liu,Bin Li,Senwei Wu,Shouqin Tian
Cr (VI) is a heavy metal ion that cannot be ignored in industrial wastewater and is highly toxic, posing a serious threat to the health and safety of natural organisms. In order to remove Cr (VI) ions in the wastewater, photocatalysis is currently employed and becomes a promising and effective way but the photocatalytic rate still needs further improvement. In this work, multi-walled carbon nanotubes (MWCNTs) modified SrTiO 3 –SrCO 3 microspheres with a three-dimensional porous structure were prepared by a facile solvothermal method. When the dosage of MWCNTs was 0.55 wt%, the obtained sample exhibited the highest photocatalytic efficiency, with approximately 100 % removal of Cr (VI) within 6 min and the photocatalytic rate constant (k) can reach 0.52 min −1 under full-spectrum light irradiation. The enhancement in the photocatalytic performance is probably attributed to the large surface area for more adsorption of Cr (VI) ions on the sample and effectively transfer of photo-generated carriers via the hetero-structures for the reaction of Cr (VI) ions with more carriers. Therefore, this work can provide a facile method for the preparation of photocatalysts with good performance for the removal of Cr (VI) in the wastewater.
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
高影响因子
Journal of Advanced Ceramics
·
2016
·Vol. 5
·期 4
·298-307
·
IF 0.957
Shen Hongfang,Lu Youjun,Wang Yanmin,Pan Zhidong,Cao Guozhong,Yan Xianghui,Fang Guoli
SrTiO3 nanoparticle (NP) photocatalyst was synthesized with a facile and environmentalfriendly hydrothermal method using tetrabutyltitanate, strontium oxide, and ethanolamine as precursors at low temperature without alkali as mineralizer for the first time. The SrTiO 3 nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and N 2 Brunauer–Emmett–Teller (BET) method. The SrTiO 3 catalyst synthesized at 120 °C (STO-120) exhibited the highest photocurrent intensity among the samples synthesized at different hydrothermal temperatures. The high photocatalytic performance of STO-120 was mainly attributed to the more homogeneous and minimum nanoparticle size, the highest surface area, and the maximum light absorption property among the four different samples. This work presented an applicable and facile method to fabricate a highly active and stable SrTiO 3 photocatalyst for organic pollutant degradation.
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
RSC Advances
·
2016
·Vol. 6
·期 31
·26280-26287
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IF 3.289
Binbin Li,Heng Liu,Chuanbin Sun,Zeeshan Ahmad,Zhaohui Ren,Xiang Li,Gaorong Han
The investigation of nano-carriers with controllable and trackable drug release kinetics has attracted worldwide attention for new tumor theranostic strategies with catabatic side effects. Herein, a range of monodispersed core–shell structured photoluminescent SrTiO3:Yb3+,Er3+@mSiO2 nanoparticles were designed and synthesized. The surfactant cetyltrimethylammonium bromide (CTAB) was used to vary the microstructure of the mesoporous SiO2 shell. The specific surface area and pore volume increase proportionally with the content of CTAB. Consequently, the doxorubicin (DOX) loading capacity increases, and the drug release kinetics possesses a sustained behaviour. More importantly, the DOX release kinetics was found to correspond well to the evolution of the up-conversion luminescence (UCL) phenomenon. More rapid drug release induces more rapid photoluminescence enhancement, and vice versa. This study has therefore been anticipated to suggest another promising multifunctional drug delivery platform for advanced chemotherapies.
研究领域:
纳米医学
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药物递送系统
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生物材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 6
·3890-3899
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IF 1.676
Xia Yongmei,Su Jiangbin,He Zuming
Promising mesoporous Bi 24 O 31 Br 10 /SrTiO 3 (BOB/STO) nanocomposites were successfully designed and fabricated via a three-step approach. The morphology, structure, optical performance, surface area and pore-size distribution of the products were characterized by x-ray powder diffraction, x-ray photoelectron spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, energy-dispersive x-ray spectroscopy, diffuse reflectance spectroscopy and Brunner–Emmett–Teller analysis. The results indicate that BOB/STO nanocomposites are composed of perovskite STO nanoparticles and monoclinic BOB nanosheets. Compared with pure STO nanoparticles or BOB nanosheets, the mesoporous BOB/STO nanocomposites show a much better photocatalytic activity for the removal of methyl orange solution under simulated sunlight irradiation. In particular, the 10% BOB/STO composite is found to be the optimal composite, over which the dye decomposition reaches 95.3% for 100 min. The photocatalytic decomposition rate of the 10% BOB/STO nanocomposite is found to be 3.4 and 4.09 times higher than that of bare BOB and STO, respectively. The enhanced photocatalytic performance of the BOB/STO nanocomposites is attributed to the efficient charge separation and reduced recombination probability of photogenerated electron–hole (e − –h + ) pairs. Furthermore, the BOB/STO nanocomposites show the considerable stability and recycling capacity in the reaction process. In addition, the photocatalytic mechanism of the BOB/STO nanocomposites is explained by a plausible Z-scheme heterojunction.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
Frontiers of Materials Science
·
2019
·Vol. 13
·期 4
·342-351
·
IF 1.701
Yang Liuxin,Chen Zhou,Zhang Jian,Wang Chang-An
Heterostructure is an effective strategy to facilitate the charge carrier separation and promote the photocatalytic performance. In this paper, uniform SrTiO 3 nanocubes were in-situ grown on TiO 2 nanowires to construct heterojunctions. The composites were prepared by a facile alkaline hydrothermal method and an in-situ deposition method. The obtained SrTiO 3 /TiO 2 exhibits much better photocatalytic activity than those of pure TiO 2 nanowires and commercial TiO 2 (P25) evaluated by photocatalytic water splitting and decomposition of Rhodamine B (RB). The hydrogen generation rate of SrTiO 3 /TiO 2 nanowires could reach 111.26 mmol·g −1 ·h −1 at room temperature, much better than those of pure TiO 2 nanowires (44.18 mmol·g −1 ·h −1 )and P25 (35.77 mmol·g −1 ·h −1 ). The RB decomposition rate of SrTiO 3 /TiO 2 is 7.2 times of P25 and 2.4 times of pure TiO 2 nanowires. The photocatalytic activity increases initially and then decreases with the rising content of SrTiO 3 , suggesting an optimum SrTiO 3 /TiO 2 ratio that can further enhance the catalytic activity. The improved photocatalytic activity of SrTiO 3 /TiO 2 is principally attributed to the enhanced charge separation deriving from the SrTiO 3 /TiO 2 heterojunction.
研究领域:
材料科学
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纳米技术
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光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhiyuan Su,Fan Fang,Xue Li,Wenjun Han,Xianglei Liu,Kun Chang
SrTiO 3 as a photocatalytic overall water splitting material has received extensive attention in recent years, while effectively suppressing Ti 3+ is the key to enhancing the photocatalytic performance. Herein, a polymerizable complexation method is employed to enable Al 3+ uniformly enter into SrTiO 3 lattice for reducing Ti 3+ , and substituting Ti 4+ with the formation of oxygen vacancy. Thus, the photogenerated carrier transport is promoted, and the resulting appropriate surface oxygen vacancy is also conducive to the adsorption of water molecules and OH*. The optimized 2% Al 3+ -doped SrTiO 3 possesses a lower Ti 3+ concentration, compared with the same sample prepared by the solid-phase griding method. Consequently, 2% Al-STO sample deposited co-catalysts achieves the highest activity and durability with the H 2 and O 2 evolution rates of 1.256 mmol·h −1 and 0.692 mmol·h −1 (0.04 g catalyst), respectively, corresponding to the AQE value of 55.46% at 365 nm. The characterizations and DFT calculation results reveal that the uniform Al 3+ doping promotes the increase in the surface oxygen vacancy, which is beneficial for accelerating the reduction reaction and facilitating carrier separation and migration, therefore enhancing the overall water splitting reaction.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiangqian Guo,Chenhui Qiu,Zhiqiang Zhang,Jie Zhang,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic CO 2 reduction plays an important role in solving environmental issues and alleviating the energy crisis. However, it is still challenging to distribute the surface-active site on photocatalysts with efficient separation of carriers in rational. Herein, the Cu species loaded SrTiO 3 nanofiber was constructed through coaxial electrospinning which could realize the dispersion of the Cu site on the one-dimensional (1D) nanofiber structure. The 1D nanofiber with Cu site exhibited superior performance on photocatalytic CO 2 reduction based on the excellent ability of charge separation. The Cu 2 O and CuO were determined to be located on the surface of 1D SrTiO 3 nanofiber by the TEM and XPS. The work functions of SrTiO 3 , Cu 2 O, and CuO were calculated to be 5.26, 5.47, and 5.51 eV, respectively, suggesting that the carriers could transfer from SrTiO 3 nanofiber to the Cu species. The yield of CH 3 OH with the optimized 8%Cu-SrTiO 3 catalyst could reach 8.08 ± 0.03 µmol⋅g −1 ⋅h −1 . This work provided a coaxial electrospinning strategy to load the Cu species active site on the surface of 1D SrTiO 3 nanofiber for enhancing photoreduction CO 2 .
研究领域:
材料科学
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环境科学
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能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Guoling Wu,Ping Li,Dongbo Xu,Bifu Luo,Yuanzhi Hong,Weidong Shi,Chunbo Liu
Visible-light-driven manganese doped SrTiO 3 nanocubes with various manganese atomic percentages in the range of 3–7%, were prepared by a hydrothermal method. These obtained photocatalysts were systematically characterized by XRD, EDX, TEM, STEM, XPS, UV–vis, PL, EIS. The results demonstrated that the Mn 4+ has substituted into the lattice of SrTiO 3 nanocubes and the absorption onset shifted toward the visible region. It is beneficial to the photocatalytic degradation of tetracycline under the visible light irradiation. Interestingly, the optimal doping atomic percentages at 5% exhibited the highest degradation rates (66.7%) in 60 min. The high photocatalytic activity could be ascribed to the Mn doping adjustment the energy band of SrTiO 3 and the highly effective separation of photo-generated electron–hole pairs. Furthermore, the possible photocatalytic mechanism has been discussed based on the active species trapping experiments and ESR analysis.
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）