MATERIALS LETTERS
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2014
·
IF 2.269
Jing Li,Yan Chen,Yongcai Zhang,Yanyan Zhao,Qian Zhang,Zhanjun Yang
This work reports an alternative preparation and evaluation of nanocrystalline N-modified CeO 2 as a visible-light-active photocatalyst . Nanocrystalline N-modified CeO 2 (which was abbreviated as CeO 2 –HNO 3 ) was synthesized directly via the solvothermal reactions of Ce(NO 3 ) 3 ·6H 2 O, concentrated (65–68 mass%) HNO 3 and toluene at 180 °C for 24 h. The composition, structure and optical property of CeO 2 –HNO 3 were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic activity of CeO 2 –HNO 3 was tested in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation, and compared with that of CeO 2 –NH 3 (which denoted the product prepared when 25-28 mass% NH 3 ·H 2 O replaced 65–68 mass% HNO 3 ). It was observed that CeO 2 –HNO 3 exhibited much higher photocatalytic activity than CeO 2 –NH 3 in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation. CeO 2 –HNO 3 may be a new promising visible-light-active photocatalyst in efficient utilization of solar energy for treating Cr 6+ wastewater.
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
Journal of Materials Chemistry A
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2013
·Vol. 2
·期 7
·2071-2078
·
IF 0
Lin Zhang,Dengwei Jing,Xilin She,Hongwei Liu,Dongjiang Yang,Yun Lu,Jian Li,Zhanfeng Zheng,Liejin Guo
The formation of heterojunctions is an efficient strategy to extend the light response range of TiO2-based catalysts to the visible light region. In addition to the bandgap edge match between the narrow bandgap semiconductors and the TiO2 substrate, a stable phase interface between the sensitiser and TiO2 is crucial for the construction of heterojunctions, since it acts as a tunnel for the efficient transfer of photogenerated charges. Herein, the coincidence site density (1/Σ) of graphite-like carbon nitride (g-C3N4) nanoflakes and two types of TiO2 nanofibres [anatase and TiO2(B)] was calculated by near coincidence site lattice (NCSL) theory. It was found that the coincidence site density of g-C3N4 and TiO2(B) nanofibre with an exposed (001) plane is 3 times of that of the g-C3N4 and anatase nanofibre with exposed (100) plane. This indicated that the g-C3N4 nanoflakes are more favoured to form stable heterojunctions with TiO2(B) nanofibres. As expected, a stable phase interface was formed between the plane of (22–40) of g-C3N4 and the plane (110) of TiO2(B) which had same d-spacing of 0.35 nm and the same orientation. Under visible light irradiation, the photogenerated electrons could efficiently migrate to the TiO2(B) nanofibres from the g-C3N4 through the heterojunctions. So the g-C3N4/TiO2(B) system exhibited better photodegradation ability for sulforhodamine B (SRB) dye than the g-C3N4/anatase system, although the photoactivity of the anatase nanofibres was much better than that of the TiO2(B) nanofibres.
研究领域:
材料科学
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光催化
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产品关联
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Jin Zhang,Suyan Li,Xiaoyu Hu,Lijun Zhang,Yu Chen,Manman Mu,Yadong Bi
It has been a blind spot to compare the modification effect of ester and acid on inorganic photo catalysts. Traditional method is always laborious to realize organic-inorganic combination by the esterification of carboxylic acids with surficial hydroxyls of nano-TiO 2 . Here, a detailed comparison was conducted using m -dipyridyl benzene skeleton (MPB) molecules containing ester or carboxylic acid groups to modify TiO 2 surface with solvothermal method . The result shows that the modification did not affect the crystal structure of TiO 2 , but formed uniformly distributed organic/inorganic binding sites and non-binding sites on its surface, thus the intrinsic UV response activity of TiO 2 can be retained. Combining with the visible light activity of organic/inorganic binding sites, a perfect photogenerated charge transfer system with matching energy levels is constructed, hence the photocatalytic performance is greatly improved. By contrast, the ester derivative of MPB (shorted as EPB) is easier to form stable organic species on the surface of nanoparticles and shows higher catalytic activity than the carboxylic acid derivative of MPB (shorted as APB), thus the study first demonstrated that the low cost and applicable photocatalyst can be obtained with much low dosage of organic modifiers containing ester groups, hence much significant in the design and optimization of catalyst surface. Compared with other reported methods, this modification has the advantages of simple process, low cost, no consumption of precious metals , ease of obtaining high activive and stable catalysts, so it is more prospective in waste water treatment.
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
STAR Protocols
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2023
·
IF 0
Bowen Jin,Yidong Ming,Jinguo Cao,Lizhi Ren,Hong Liu,Kai Wang,Congcong Wu
Summary The efficient functioning and stability of a perovskite photoactive layer are paramount to the performance of solar cell devices. Here, we present a protocol for the synthesis of a high-performance exemplified methylammonium lead iodide (CH 3 NH 3 PbI 3 or MAPbI 3 ) perovskite photoactive layer. We describe steps for preparing the requisite ratios of the precursor powders, synthesizing MAPbI 3 single crystals, and selecting a suitable preparation technique. We then detail a flexible doping strategy for the perovskite photoactive layer. For complete details on the use and execution of this protocol, please refer to Wang and Wu (2020, 2022, 2023). 1 , 2 , 3
研究领域:
材料科学
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太阳能技术
✓ 已验证
DOI
PubMed
POLYMER
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2025
·
IF 4.5
Yaxin Qiu,Jinxuan Ai,Aiying Liu,Chengkai Yang,Zhifeng Wang,Chong Chen,Xiaozhi Wang
For shape-shifting polymeric materials, the structure of material plays a critical role in determining shape-shifting pathways. However, homogenous structure is often insufficient to meet the programming demands of materials in complex external stimuli fields. In this work, a photoactive cross-linked network was constructed using coumarin-end-capped brush macromolecules, with the introduction of carbon nanofibers enabling efficient photothermal and electrothermal conversion. The dual-patterned programming of this system diversified responsive behaviors of the materials by introducing UV radiation and a shielding layer. Furthermore, the evolution of photo-crosslinking under UV irradiation was monitored in situ via rheological testing, and the temperature distribution within the materials was simultaneously detected in situ. This work presents a practical strategy for dual-patterned programming, enabling the design of shape-shifting pathways of materials under complex stimuli fields.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2022
·Vol. 11
·期 21
·2201397
·
IF 11.092
Shixiong Yi,Ying Zhou,Jiamei Zhang,Min Wang,Shaohui Zheng,Xiao Yang,Lian Duan,Rui L. Reis,Fangyin Dai,Subhas C. Kundu,Bo Xiao
One of the leading causes of death globally, especially in underdeveloped countries, is bacterial infection. Recently, the prevalence of infections from antibiotic-resistant bacteria has been increasing, which makes the need for innovative antibacterial wound dressings urgent. It is reported that g-C 3 N 4 -based flat silk cocoons (FSCs) with rechargeable antibacterial activity can efficiently generate reactive oxygen species (ROS) under daylight irradiation. The photoactive FSCs store the ROS and then release them in the dark. The engineered FSCs exhibit integrated properties of good biocompatibility, strong mechanical characteristics, robust photoactivity with photostorability, and excellent bactericidal efficiency (99.9% contact killing). In a rat model of infected wounds, the photoactive FSCs induce faster healing and reduce bacterial infections. The successful application of these FSC materials as wound dressings may provide a versatile platform for exploring the use of green photoactive antibacterial materials for accelerated wound healing and prevention of infections.
研究领域:
生物材料学
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医学
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抗菌技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Matter
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2024
·
IF 17.3
Jingyuan Chen,Xiaofeng Li,Qiujiang Liang,Binglin Zeng,Jing Zheng,Changjin Wu,Yingnan Cao,Jun Yang,Jinyao Tang
The macroscopic properties of a material are predominantly governed by the precise arrangement of the atoms composing its crystal lattice. Recent research shows that photons can excite vibrational modes in solids that induce dynamic transitions to new phases with exotic properties. Here, we demonstrate that colloids, as a micrometer-scale “atom” counterpart, can also be assembled with light, leading to dynamic material structure and properties. This work uses photoactive colloidal particles with long-range tunable interaction, which provides a versatile route to guide assembly on demand. To induce interaction directionality for assembly, the photonic nanojet effect on a photoactive colloidal particle is exploited to create a highly localized hydrodynamic flow resembling directional molecular binding. Adjusting the illuminating condition allows the tunable directional potential to be generated on spherical colloids, forming the polymorphic assembly to all 2D Bravais lattices on demand. Finally, we reveal that the rapid colloid phase transition, as controlled with light, can be used for reconfigurable photonic devices to control the diffraction of the near-infrared laser.
研究领域:
材料科学
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光学
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凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
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2024
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IF 11.4
Xin Zuo,Zhuozhi Ouyang,Jinmo Liao,Rui Ding,Weiwei Zhang,Chi Zhang,Xuetao Guo,Lingyan Zhu
Due to the production of a large amount of biochar, highly photoactive biochar-derived dissolved organic matter (BDOM) from different sources is released into surface water. This study investigated the molecular composition of BDOM (sludge, bamboo and stalk BDOM) using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and used tetracycline (TC) as model pollutant to investigate the relationship between molecular composition and BDOM photoactivity, specifically focusing on reactive oxygen species (ROS) production. The results indicate that the fluorescence signal intensity of humic acid-like and aromatic proteins in the plant-derived BDOM are significantly higher than that derived from sewage sludge. FT-ICR MS results also showed that plant-derived BDOM contained more CHO molecular formula. Photodegradation experiments of TC mediated by various BDOM analogues demonstrated the photoactivity is highly correlated with the components and functional groups. The electrochemical experiments and density functional theory (DFT) calculations further verified that the aromatic moiety, sulfydryl group and amino group of BDOM affected the electronic supply and energy transfer. Higher electron and energy transfer favor the reaction of BDOM with the ground state oxygen to generate ROS , thus promoting photodegradation of TC . This study provides a new basis for better assessing the ecological risks of BDOM.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Jie Pan,Shirui Wang,Ailian Chen,Yue Chen,Menghan Wang,Yang Chen
As one of the most significant rare-earth oxides, cerium dioxide (ceria, CeO 2 ) has an enormous potential in a variety of materials science applications due to many excellent characteristics. In this work, cubic-phase mesoporous CeO 2 (mCeO 2 ) nanospheres with nanocrystalline frameworks, high Ce 3+ and oxygen vacancy contents, large porosity and specific surface area, were fabricated via a facile solvothermal method using inorganic precursors and without surfactant as a template. The resulting products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV–vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy , photoluminescence (PL) spectroscopy, and N 2 adsorption-desorption analyses. Raman and XPS results confirmed the presence of Ce 4+ , Ce 3+ and Zr 4+ ions and oxygen vacancies. By comparison with the undoped ones, Zr-doping in mCeO 2 nanospheres contributed to increased concentrations of Ce 3+ (45.25% vs 32.64%) and oxygen vacancy (37.63% vs 27.53%), as well as decreased band gap energies (2.9 vs 3.1 eV). The photocatalytic activities of the pure and Zr-doped mCeO 2 nanospheres were evaluated with the degradation of methylene blue (MB) under visible-light irradiation. The Zr-doped mCeO 2 products exhibited a superior photodegradation rate of ca. 94% after 120 min visible-light illumination. A kinetic study suggested that the reaction followed pseudo-first order rate equation. The optimizations on Zr-doped mCeO 2 nanospheres against structural, optical, and physicochemical properties might be responsible for the enhanced visible-light-driven photocatalytic performance. The plausible photodegradation mechanism over MB dyes of mCeO 2 nanospheres were also proposed. This work is expected to provide an insight view into the design and synthesis of low-cost and high-efficiency CeO 2 -based photocatalysts with improved visible photocatalytic activity.
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
JOURNAL OF MATERIALS CHEMISTRY
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2011
·Vol. 21
·期 33
·12479-12484
·
IF 5.101
Liqun Ye,Lihong Tian,Tianyou Peng,Ling Zan
Highly symmetrical BiOI single-crystal nanosheets (BiOI SCNs) with dominant exposed {001} facets (up to 95%) have been synthesized by annealing BiI3 and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, fast-Fourier transform pattern, UV-vis diffuse reflectance and photoluminescence. The thickness and the {001} facets percentage of BiOI SCNs can be tuned by changing the annealing temperature. The thermal decomposition process of BiI3 and the formation mechanism of BiOI SCNs were investigated. BiOI SCNs exhibit higher photoactivity (about 7 times) than irregular BiOI for degradation of Rhodamine B (RhB) dye under visible light irradiation. The {001} facets are the reactive facets of BiOI. The origin of {001} facets-dependent photoactivity is due to an improvement of the separation efficiency of photo-induced electrons and holes.
研究领域:
材料科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 31
·315601
·
IF 3.404
Gang Xiao,Shengnan Xu,Peifeng Li,Haijia Su
Heterostructured photocatalysts based on g-C3N4 and TiO2 represent a promising kind of photocatalyst in environmental fields, but the synthesis methods are always complex and not green. In the present paper, a facile and green one-step calcination procedure at lower temperature (450 °C) with the assistance of water is developed to synthesize a visible-light-active TiO2@g-C3N4 heterostructured photocatalyst, which shows higher visible-light-driven activity (k = 0.014 min−1) than pure g-C3N4 (k = 0.0036 min−1) and TiO2 (k = 0.0067 min−1) for methyl orange degradation. Excellent performance (over 90% conversion) was also observed for the removal of rhodamine B, phenol, and Cr(VI) under visible light. The heterostructured photocatalyst showed favorable reusability, preserving 86% of its activity after five successive cycles. A mechanism study demonstrates that the enhanced photocatalytic activity results from the efficient separation of the photo-generated charge carriers through the intimate interface between the two semiconductors based on their appropriate band structures and light-induced mechanism. The heterostructured photocatalyst will certainly find wide applications in the treatment of various toxic pollutants in wastewater using abundant solar energy. Furthermore, this facile and green procedure and the proposed synergistic mechanism will provide guidelines in designing other g-C3N4 based organic–inorganic composite photocatalysts for various applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2020
·
IF 12.35
Xiaoxiang Xu,Ran Wang,Xiaoqin Sun,Meilin Lv,Shuang Ni
Sr2TiO4 and NaLaTiO4 are structural congeners with K2NiF4-type layered perovskite structure. However, nitrogen doping results in distinct modifications to their visible light absorption. Na/La ordering in the structure of NaLaTiO4 brings interesting structural features that are critical to a wealth of important factors such as nitrogen uptake, defect concentration, microstructures, and so forth. In sharp contrast to nitrogen-doped Sr2TiO4 (i.e., Sr2TiO4–xNy) whose photocatalytic activity is negligible under visible light illumination, nitrogen-doped NaLaTiO4 (i.e. NaLaTiO4–xNy) demonstrates very high activities for both photocatalytic water reduction and oxidation reactions. High apparent quantum efficiency ∼3.2% at 420 ± 20 nm has been recorded for NaLaTiO4–xNy, outperforming many other active metal oxynitride photocatalysts investigated under similar conditions. Theoretical calculations reveal that Na/La ordering incurs a strong electric field across Ti(O, N)6 octahedron layers and breaks the coplanar settlement of highest occupied molecular orbitals and lowest unoccupied molecular orbitals which are helpful to inhibit intralayer charge recombination.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
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