APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Bingbing Hu,Maocong Hu,Qiang Guo,Kang Wang,Xitao Wang
In this work, a series of In(OH) 3 with abundant indium vacancies were synthesized by hydrothermal method using mixed solvent of ethylenediamine(En) and water for photocatalytic reduction of CO 2 with H 2 O vapor. The morphology, particle size, crystallinity, pore structure, and vacancy concentration of photocatalysts were successfully regulated by adjusting the ratio of En and water in mixed solvent, which were characterized by XRD, FT-IR, TG-DTA, SEM, HRTEM, UV–vis DRS, PL spectra, XPS, and EPR. Moreover, the effect of En/water ratio on the adsorption capacity to CO 2 and photo-electrical properties of In(OH) 3 were further investigated by in-situ FTIR, PL spectra, UV–vis DRS, CV, and EIS. In(OH) 3 prepared in mixed solution exhibited much higher photocatalytic activity for CO 2 reduction with H 2 O vapor compared to that prepared with water only solvent. The enhanced photocatalytic performance can be attributed to the special morphology, smaller particle size, larger BET surface area, and especially generated indium vacancies creating defect energy levels in the bandgap, which improved visible light absorption, carrier separation, and CO 2 chemisorption. This work paves the way to enable a non-visible-light response material with high visible-light photocatalytic activity by regulating vacancy concentration via a facile method.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2016
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IF 3.349
Mingming Zou,Honghong Liu,Lu Feng,Fengqiang Xiong,Tiju Thomas,Minghui Yang
A simple solvothermal approach with post-calcination is used to obtain (Ag, Ag 2 O) co-loaded TiO 2 microspheres with high specific surface area (43.8 m 2 g -1 ) and desirable visible light photocatalytic degradation (64% after 2 h visible light irradiation). Generally, N-doping of TiO 2 via nitridation using NH 3 improves the visible light absorption property of material. However, nitridation of (Ag, Ag 2 O) co-loaded TiO 2 results in a deleterious impact on the photocatalytic performance (around 20% after 2 h visible light irradiation). This is because nitridation of Ag-Ag 2 O-TiO 2 results in (a) reduction of Ag 2 O to Ag and (b) Ag agglomeration and grain growth on TiO 2 particles. These results in fact imply that in as-synthesized (Ag, Ag 2 O) co-loaded TiO 2 systems, local surface plasmonic resonance (associated with of 5–12 nm Ag particles) aids in enhanced broad band visible light absorption; furthermore the heterojunction between TiO 2 and Ag 2 O improves efficiency with which photogenerated carriers become available for photocatalysis . In all cases we show through selective radical quenching experiments that singlet oxygen is the primary reason for the dye degradation observed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 23
·10973-10983
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IF 3.3
Bicheng Hu,Yuhui Zhang,Jincheng Zhang,Jiazan Liu,Meng Lei,Chenxi Zhao,Qiujun Lu,Haiyan Wang,Fuyou Du,Shiying Zhang
In this work, a novel flower-shaped NV-g-C3N5@VS2 heterojunction was prepared by hydrothermal in situ synthesis using NV-g-C3N5 as the matrix and thioacetamide as the precursor. The prepared heterojunction showed a flower-like and layered structure, which widened the visible light absorption range and facilitated the usage of visible light. Under visible light irradiation, the NV-g-C3N5@VS2 heterojunction exhibited excellent photoelectrocatalytic nitrogen reduction activity with an ammonia yield of 49.26 μg h−1 mg−1 in an electrolyte solution saturated with N2. Moreover, the NV-g-C3N5@VS2 heterojunction achieved outstanding photocatalytic degradation activity. The photocatalytic degradation rate of Rhodamine (RhB) reached 95% in 35 min under visible light irradiation. More importantly, the catalyst displayed good reusability and stability after four cycling runs for the photodegradation of MB. The prepared catalyst showed excellent photocatalytic universality and was also applied to efficiently degrade organic pollutants such as methyl orange (MO) and methylene blue (MB). Therefore, solar light-driven photocatalytic and photoelectrocatalytic applications based on the NV-g-C3N5@VS2 heterojunction are expected to pave a new way for fertilizers, energy utilization, and environmental remediation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 54
·32652-32661
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IF 3.119
Yu Gao,Kun Qian,Baotong Xu,Fu Ding,Valerian Dragutan,Ileana Dragutan,Yaguang Sun,Zhenhe Xu
The generation of hydrogen-based energy and environmental remediation using sunlight is an emerging topic of great significance for meeting the ever-growing global need. However, the actual photocatalytic performance is still far below expectations because of the relatively slack charge-carrier separation and migration as well as insufficient spectral absorption in semiconductors. Therefore, the rational construction of heterojunctions is considered as an effective approach to solving the above issues. In this context, we have, for the first time, designed and synthesized a two-dimensional 2D-on-2D heterostructure, based on 2D Ag-doped ZnIn2S4 nanoplates deposited on 2D g-C3N4 nanosheets (denoted as g-C3N4/Ag:ZnIn2S4). This construct benefits from improved visible-light absorption by unveiling a greater number of catalytically active sites, effectively enhancing charge-carrier separation and relocation. Detailed analysis has proved that under visible-light irradiation, the optimized g-C3N4/20 wt% Ag:ZnIn2S4 nanocomposite has substantially upgraded photocatalytic activity in hydrogen formation by water splitting (hydrogen evolution rate of up to 597.47 μmol h−1 g−1) and in residual dyestuff degradation (methyl orange, MO; degradation rate constant of 0.1406 min−1). Noteworthily, these two exceptionally high values respectively represent 30.73 and 5.42 times enhancements vs. results obtained with bare g-C3N4. Another strong point of our g-C3N4/Ag:ZnIn2S4 is its impressive recyclability for 20 runs, with no relevant metal release in the aqueous solution following photocatalysis. This work introduces new, superior access to highly efficient photocatalysts founded on 2D/2D nanocomposites serving both the production of hydrogen as an energy carrier and environmental remediation.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Guanghui Liu,Ju Xu,Ruixing Li
Recently, nano-cesium tungsten bronze (Cs x WO 3 ) is found to be a new candidate for the application in solar filter due to its high visible transmittance and excellent near-infrared shielding ability. However, a typical two-dimensional (2D) Cs x WO 3 has not been reported since 2D nanomaterials have attracted great attention due to their fascinating properties, e.g., graphene. Herein, a novel synthesis system and related mechanisms are tried to develop for synthesizing 2D Cs x WO 3 via hydrothermal method, which an original inspiration derived from the morphology control of sulfides. The results indicate that morphology modifier represents a new strategy in which thiourea and oleylamine interact synergistically rather than independently to synthesize 2D Cs 0.3 WO 3 . The more regular and larger the rectangular nanosheet, the broader and stronger the light absorption, the rectangular Cs 0.3 WO 3 nanosheets with the maximum size are synthesized from thiourea, oleylamine and HCl concentrations of 4, 0.061 and 320 mmol/L, respectively, and exhibit a broad and strong absorption spectrum. The above nanosheet shows excellent instantaneous photo-thermal conversion property resulting in an obvious temperature increases from 20 °C to 88.5 °C when it was irradiated by 50 W halogen lamp for 10 s. Finally, both chemical reaction and morphological evolution in the synthesis processes are revealed.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2017
·
IF 0.457
Peisong Tang,Haifeng Chen,Chunyan Lv,Kunyan Wang,Yongya Wang
Using Eu(NO3)3·6H2O and Fe(NO3)3·9H2O as raw material, the nanoparticulate EuFeO3 was directly synthesized by a one-step microwave route without additional high temperature calcination process. The prepared sample was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FT-IR) and UV-visible diffuse reflectance spectroscopy (DRS). The results show that the EuFeO3 is single phase perovskite, and its morphology is nanoparticle with an average diameter of about 60–80 nm. The prepared nanoparticle has an optical band gap of 2.3 eV, and exhibits strong visible-light absorption. The photocatalytic activity of nanoparticulate EuFeO3 was investigated in experimental simulation wastewater containing 10 mg/L methyl orange (MO). The photocatalytic experiment indicates that the prepared nanoparticulate EuFeO3 was highly visible-light activities for the degradation of MO. It is suggested that the narrow band gap and the strong visible-light absorption are responsible for the high visible-light photocatalytic activity of the prepared EuFeO3.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
FUEL
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2021
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IF 6.609
Liangdong Hu,Ruifan Li,Ying Liu,Dona Souliyathai,Wenjie Zhang,Yubao Chen
Fuel components were prepared in this study using rubber seed oil via photothermal catalysis under energy-saving conditions. Modified TiO 2 was employed as the catalyst in the catalytic reactions. X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray fluorescence (XRF), hydrogen temperature-programmed desorbtion (H 2 -TPD), CO pulse chemisorption analysis, and UV–vis spectroscopy were employed to examine the microstructure and chemical properties of the modified catalysts. The loading of the catalysts with different active metals considerably reduced the bandgap, leading to enhancements in the absorption of visible light. Temperature, H 2 pressure, and reaction time were optimised for the photothermal catalytic reaction via the single factor test. The Pt/TiO 2 catalyst realised the highest conversion and selectivity among the tested samples at 120 °C and a H 2 pressure of 0.4 MPa for 12 h. Additionally, photo-decarboxylation was confirmed via probing with oleic acid to be the predominant process in the catalytic reaction. This research provides an energy-saving strategy for the preparation of biofuels.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xuqiang Zhang,Gongxuan Lu,Xiaofeng Ning,Chengwei Wang
Photocatalytic visible water splitting is still impeded by slow kinetics of multi-electron-driven water oxidation , fast carrier recombination and insufficient light absorption of the photocatalyst. Herein, the core-shell heterojunction B x Ga 1−x As/GaAs photocatalyst exhibited a remarkably promoted activity for hydrogen generation by direct dissociation of water molecule over boron site on catalyst surface due to redistributing electron density, as well as by promotion of visible absorption and acceleration of charge separation and transfer via a built-in electric field. B 0.25 Ga 0.75 As/GaAs photocatalyst exhibited hydrogen evolution rate of 8.4 μmol during 8 h from pure water without electron donor and applied bias.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 22
·3748-3753
·
IF 4.568
Ronghua Yi,Jin Wang,Xiaoping Yue,Yan Liang,Zhuoyao Li,Huixiang Sheng,Mengdan Guan,Yameng Zhu,Qizeng Sun,Li Wang,Xiao Huang,Gang Lu
Graphical Single-crystalline Bi 9 O 7.5 S 6 thin nanosheets were successfully synthesized by using a solvothermal method. The thin Bi 9 O 7.5 S 6 nanosheets are used as active layer in an optoelectronic device, which exhibits a sensitive photoelectric response to light in a wide range of 400–800 nm. Bismuth-based compounds possess layered structures with a variety of stacking modes, endowing the compounds with diverse properties. As one type of bismuth oxysulfides, Bi 9 O 7.5 S 6 nanocrystals has great applications in photodetection; however, the responsivity of bulky Bi 9 O 7.5 S 6 is limited due to the poor charge separation. Herein, single-crystalline Bi 9 O 7.5 S 6 thin nanosheets are successfully synthesized by using a solvothermal method. The thickness of the obtained Bi 9 O 7.5 S 6 nanosheets is down to 15 nm and can be easily tuned by varying the reaction period. Moreover, the Bi 9 O 7.5 S 6 nanosheets show strong light absorption in the visible and near infrared range, making it a promising candidate in optoelectronics. As a demonstration, the thin Bi 9 O 7.5 S 6 nanosheets are used as active layer in an optoelectronic device, which exhibits sensitive photoelectric response to light in a wide range of 400–800 nm. The responsivity of the device reaches up to 1140 μA W −1 , and the performance of the device is stable after long-period illumination. This work demonstrates a great potential of the thin Bi 9 O 7.5 S 6 nanosheets in optoelectronic devices, and these nanosheets may also be extended to various optoelectronic applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 32
·11027-11033
·
IF 6.4
Yin Jiang,Zhaoyang Wang,Qihang Zhou,Peizhi Yang,Peng Qin,Fuqiang Huang,Wen Yang
TiO2 nanomaterials are cheap and stable candidates for the photocatalytic degradation of antibiotic residues in water. However, their activity is still limited by insufficient photon absorption and charge extraction. Here, ruthenium-doped mesoporous TiO2 crystals (Ti1−xRuxO2−y) are prepared by corroding a step-like layered K2Ti8−xRuxO17 precursor. The removal of potassium ions and the reconfiguration of [TiO6] octahedrons in K2Ti8−xRuxO17 lead to the formation of mesoporous crystals. Meanwhile, the addition of Ru3+ can create Ti3+ species and oxygen vacancies in situ inside the crystals, extending the photon absorption from the UV to the whole visible region. The mesoporous Ti0.95Ru0.05O2−y crystals show a 98.74% degradation efficiency of tetracycline hydrochloride within 50 min under simulated sunlight (AM 1.5 G 100 mW cm−2) illumination. This work offers an effective way for the construction of efficient photocatalysts with high photon absorption and charge extraction simultaneously.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jiaqian Zhu,Yinghua Shen,Xiang Yu,Jia Guo,Yi Zhu,Yuanming Zhang
Immobilized CdS/BiOCl film photocatalysts were successfully synthesized by a facile two-step hydrothermal-hydrolysis method. The structures, morphologies, photocatalytic properties and reusabilities of the samples were studied. The photocatalytic activities of CdS/BiOCl were significantly improved compared with pure BiOCl. The photocatalytic activity of 6% CdS/BiOCl was the highest and 10 times higher than pure BiOCl, which was attributed to the enhanced visible light absorption and the higher separation of photogenerated carriers. Besides, 6% CdS/BiOCl also showed good recycling performance. A new photocatalytic mechanism, totally different from other mechanisms of BiOCl-based heterostructures , was revealed. It was part of electrons on the conducting band of CdS rather than the transferred electrons on the conducting band of BiOCl that oxidized O 2 into O 2 − , and O 2 − together with h + on the valence band of CdS degraded organic pollutants. BiOCl did not generate electrons and holes, but only served as the electron transferer as electrons on the conducting band of CdS transferred to the conducting band of BiOCl, facilitating the separation of hole-electron pairs. This work provided a good reference for design and synthesis of film photocatalysts and new insights into photocatalytic mechanisms for heterostructures.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Guoqi Ji,Zewen Xiao
Halide double perovskites A2B(I)B(III)X6, where the monovalent B(I) and trivalent B(III) cations adopt a rock-salt-ordered arrangement primarily due to their large charge difference and ionic radius difference, have attracted substantial interest in the field of optoelectronics. On the other hand, the combinations of two divalent B-site cations usually result in AB(II)′0.5B(II)″0.5X3 perovskite solid solutions due to the zero charge difference, rather than the rock-salt-ordered A2B(II)′B(II)″X6 double perovskites. In this work, we report the theoretical design and experimental verification of A2B(II)′B(II)″X6 halide double perovskites with unusually rock-salt-ordered divalent B-site cations. Through theoretical calculations, we demonstrate that introducing divalent transition metal cations with partially filled d orbitals into the double perovskite structure can produce significant Jahn–Teller distortions and thus stabilize the rock-salt-ordered double perovskite structure. Among the considered compounds, Cs2HgCuCl6, Cs2HgPdCl6, and Cs2HgPtCl6 were predicted to be thermodynamically stable. Experimentally, Cs2HgCuCl6 and Cs2HgPdCl6 were successfully synthesized as representative examples of the A2B(II)′B(II)″X6 halide double perovskites. The synthesized pure-phase Cs2HgCuCl6 exhibits a small bandgap of 1.08 eV that is suitable for visible light absorption. Our work provides an approach for designing novel double perovskites with two kinds of divalent cations, which expands the large family of halide double perovskites for optoelectronic applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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