JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Peng Bai,Xinli Tong,Jun Wan,Yiqi Gao,Song Xue
The photocatalytic selective transformation of amines is a green and cost-effective technology to obtain value-added products in chemical industry. In this work, a series of bismuth-based photocatalysts including Bi 2 MoO 6 , Bi 2 WO 6 , Bi 5 O 7 Cl, Bi 5 O 7 Br, Bi 5 O 7 I, BiPO 4 , BiVO 4 , Bi 2 O 3 and various morphology Bi 2 O 2 CO 3 (flower-like, sponge-like, plate-like and spherical) were synthesized and employed in the aerobic oxidative coupling of benzylamine. It is found that flower-like Bi 2 O 2 CO 3 exhibited the highest photocatalytic activity, in which a 100% conversion of benzylamine with 99.0% selectivity of N -benzylidenebenzylamine was obtained at room temperature. Moreover, the photocatalytic oxidative coupling processes of various aromatic and aliphatic amines were further investigated, and excellent yields and selectivities of corresponding products are attained. Then, based on characterization results (XRD, SEM, BET and XPS, etc.) of catalyst, high photocatalytic activity of flower-like Bi 2 O 2 CO 3 is attributed to thin nanopetals, low band gap, the morphology and large specific surface area. Finally, a possible reaction mechanism is proposed for the photocatalytic oxidative coupling of benzyl amine.
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DOI
高影响因子
Advanced Powder Materials
·
2021
·
IF 0
Shaoju Jian,Zhiwei Tian,Jiapeng Hu,Kaiyin Zhang,Lin Zhang,Gaigai Duan,Weisen Yang,Shaohua Jiang
A series of La-doped ZnO (La/ZnO) nanofibers were prepared by electrospinning-calcination technology and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet–visible (UV–Vis) absorption spectroscopy and specific surface area analysis. The effect of numerous operational parameters involving calcination temperature, La doping amount, La-doped ZnO concentration and initial Rhodamine B (Rh B) concentration on photocatalytic efficiency of the composite has been analyzed by using Rh B for degradation under the illumination of visible light. Under optimum conditions, ZnO doped with 1.5 at.% La achieved 94.31% Rh B degradation after 510 min of visible light illumination. The kinetic data of La/ZnO catalyst for Rh B photodegradation fitted the Langmuir-Hinshelwood first-order (LHFO) kinetic model well.
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DOI
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 2
·310-314
·
IF 1.119
He Hongyan,Li Wenliang,Xie Zhigang,Jing Xiabin,Huang Yubin
Aldehyde group-functionalized [Ru(bpy) 2 L](PF 6 ) 2 catalyst was prepared and immobilized onto the mesoporous silica nanoparticles to act as a heterogeneous catalyst for the selective oxidation of thioanisole to methyl phenyl sulfoxide under visible light. The heterogeneous catalyst can be easily recovered by simple centrifugation without chemical treatment, exhibiting comparable catalytic efficiency with homogeneous ones and no decrease in catalytic efficiency after at least 5 cycles.
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DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 17
·期 3
·671-677
·
IF 3.858
Qinghua Wang,Shiyong Yu,Zhibing Tan,Renfei Zhang,Zhao Li,Xuechuan Gao,Beibei Shen,Haiquan Su
In this work, monodisperse CeO2/Bi2O3 nanospheres were successfully synthesized via the three-step method, which is a traditional hydrothermal dip-coating–anneal method, and subsequent facile calcination at 600 °C for 4 h. The structure of obtained products was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The results showed that highly uniform CeO2 microspheres and monodisperse CeO2/Bi2O3 nanospheres were obtained, the sizes of CeO2 microspheres and CeO2/Bi2O3 nanospheres were ~100 nm and ~125 nm. Besides that, the photocatalytic activities of CeO2/Bi2O3 nanocomposites were evaluated by photodegradation of Rhodamine B (RhB) under visible light. CeO2/Bi2O3 nanospheres exhibited a wide visible-light absorption with an edge at ca. 800 nm, which indicated a wide red shift compared to that of individual CeO2 microspheres (ca. 450 nm) and individual Bi2O3 nanoparticles (ca. 450 nm). Furthermore, the obtained CeO2/Bi2O3 nanospheres had remarkable photocatalytic degradation activities of dye under visible light compared with the activities of two individual photocatalysts of CeO2 microspheres and Bi2O3 NPs with the same concentration. The higher photocatalytic degradation activities of the photocatalysts could be ascribed to the following factors: (1) a large specific surface area of CeO2/Bi2O3 nanospheres with small size, (2) the efficient separation of photogenerated electrons and holes of the photocatalysts, and (3) a wide visible-light photoabsorption range (700 nm > λ > 400 nm). Therefore, small monodisperse CeO2/Bi2O3 nanospheres were designed by a simple route with efficient photocatalytic activity.
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DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·Vol. 8
·期 19
·3214-3222
·
IF 6
Jiaqi Liu,Feng Zhang,Cuihe Fan,Zhengwei Cao,Yuying Hao
Perovskite quantum dots (QDs), with outstanding properties, including tunable emissions, high color purity, and low cost solution processability, have become promising candidates in light-emitting applications. However, the inherent instability issue strongly restricts further development and commercialization of light-emitting devices based on perovskite QDs. As well investigated in conventional QDs, the construction of QDs with core–shell structure is recognized as an effective way to improve the stability and optimize luminescent properties at the same time. Inspired by the unique structure diversity of perovskite materials, 2D/3D FAPbBr3@GA2PbBr4 QDs are proposed and fabricated through a one-step phase transfer enhanced emulsion synthesis. By systematically tuning the ratio between GABr and FABr as well as a combined analysis with X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, absorption and photoluminescence spectrum characterizations, a well-defined core–shell structure is demonstrated for FAPbBr3@GA2PbBr4 QDs under an appropriate ratio of GABr/FABr. Compared to the original QDs, the as fabricated core–shell QDs exhibit an enhanced exciton binding energy and improved stability under heat, light, and moisture exposure. Moreover, phosphor converted light-emitting diodes based on the core–shell QDs are also fabricated with a much improved device performance than that of QDs without a core–shell structure, proving the superiority of FAPbBr3@GA2PbBr4 QDs in light-emitting applications.
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高影响因子
Biointerphases
·
2024
·Vol. 19
·期 4
·
IF 1.6
Yuan Bowei,Jiang Xue,Xie Zijun,Zhang Xuanjun,Zhang Jiaxin,Hong Jing
Retinal degenerative diseases, which can lead to photoreceptor cell apoptosis, have now become the leading irreversible cause of blindness worldwide. In this study, we developed an organic photovoltaic biomaterial for artificial retinas, enabling neural cells to detect photoelectric stimulation. The biomaterial was prepared using a conjugated polymer donor, PCE-10, and a non-fullerene receptor, Y6, both known for their strong near-infrared light absorption capabilities. Additionally, a fullerene receptor, PC61BM, was incorporated, which possesses the ability to absorb reactive oxygen species. We conducted a comprehensive investigation into the microstructure, photovoltaic properties, and photothermal effects of this three-component photovoltaic biomaterial. Furthermore, we employed Rat adrenal pheochromocytoma cells (PC-12) as a standard neural cell model to evaluate the in vitro photoelectric stimulation effect of this photovoltaic biomaterial. The results demonstrate that the photovoltaic biomaterial, enriched with fullerene derivatives, can induce intracellular calcium influx in PC-12 cells under 630 nm (red light) and 780 nm (near-infrared) laser irradiation. Moreover, there were lower levels of oxidative stress and higher levels of mitochondrial activity compared to the non-PC61BM group. This photovoltaic biomaterial proves to be an ideal substrate for near-infrared photoelectrical stimulation of neural cells and holds promise for restoring visual function in patients with photoreceptor apoptosis.
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DOI
PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Wu Jingjun,Guo Jing,Linghu Changhong,Lu Yahui,Song Jizhou,Xie Tao,Zhao Qian
The low productivity of typical 3D printing is a major hurdle for its utilization in large-scale manufacturing. Innovative techniques have been developed to break the limitation of printing speed, however, sophisticated facilities or costly consumables are required, which still substantially restricts the economic efficiency. Here we report that a common stereolithographic 3D printing facility can achieve a very high printing speed (400 mm/h) using a green and inexpensive hydrogel as a separation interface against the cured part. In sharp contrast to other techniques, the unique separation mechanism relies on the large recoverable deformation along the thickness direction of the hydrogel interface during the layer-wise printing. The hydrogel needs to be extraordinarily soft and unusually thick to remarkably reduce the adhesion force which is a key factor for achieving rapid 3D printing. This technique shows excellent printing stability even for fabricating large continuous solid structures, which is extremely challenging for other rapid 3D printing techniques. The printing process is highly robust for fabricating diversified materials with various functions. With the advantages mentioned above, the presented technique is believed to make a large impact on large-scale manufacturing.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 13
·10657-10668
·
IF 2.22
Li Lingjiao,Xu Jing,Li Xuanhao,Liu Zeying
Previous reports indicate that the catalyst Cd x Zn 1− x S shows good activity and reliability in the process of photocatalytic hydrogen production. However, it is still a challenge to design a cost-effective catalyst to replace the traditional Cd x Zn 1− x S. In this work, Roman broccoli Cd 0.8 Zn 0.2 S-2 was successfully prepared through reasonable adjustment and control of the amount of raw materials. In the photocatalytic hydrogen evolution test, the amount of hydrogen evolution of CZS-2 was 1.24, 1.34, 2.06, and 2.24 times that of CZS-1, CZS-3, CZS-4, and CZS-5, respectively. This is because Cd 0.8 Zn 0.2 S-2 has more excellent synergy inside. Theoretical and experimental studies show that, based on rational design, the optical and electrical properties of the CZS-2 structure have been substantially improved (based on UV–Visible diffusion and photoluminescence). The mechanism of the study shows that the photocatalytic hydrogen evolution activity of CZS-2 is effectively improved due to the favorable energy band of effective charge transfer inside CZS-2. In this work, Roman broccoli-like CZS-2 provides a new research direction for photocatalytic water decomposition.
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DOI
高影响因子
Journal of Materiomics
·
2019
·
IF 0
Ping Wen,Ying Zhang,Guang Xu,Di Ma,Ping Qiu,Xiaoxia Zhao
Most of TiO 2 particles can be used as a photocatalyst for the selective oxidation of cyclohexane under ultraviolet light illumination. In this paper, Ti 3+ self-doped TiO 2 submicron-sized particles (i.e., Ti 3+ /TiO 2 SMP) were used as a catalyst for visible-light driven photocatalytic cyclohexane oxidation. The microstructure and properties of the Ti 3+ /TiO 2 SMP were characterized by X-ray diffraction (XRD), UV–visible diffuse reflection (UV–Vis DRS), scanning electron microscopy (SEM), electron paramagnetic resonance (EPR), solid-state photoluminescence spectroscopy (PLS) and X-ray photoelectron spectroscopy (XPS). The Ti 3+ /TiO 2 SMP exhibits good visible-light driven photocatalytic performances for cyclohexane oxidation with cyclohexanone as a dominate product. Effects of solvent, reaction temperature, reaction time and oxygen pressure on the formation of cyclohexanone were investigated. The cyclohexane oxidation over the Ti 3+ /TiO 2 SMP photocatalyst using carbon tetrachloride as a solvent under the optimal conditions presents a greater selectivity to cyclohexane (i.e., 95.1%). Based on the controlled experimental results with different radical scavengers, the hole (h + ) is critical for the activation of cyclohexane.
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DOI
RSC Advances
·
2013
·Vol. 3
·期 43
·20606-20612
·
IF 2.562
Yongliang Cheng,Jiangtao Chen,Xingbin Yan,Zongmin Zheng,Qunji Xue
In this study, porous BiVO4 fibers were fabricated by a simple electrospinning technique followed by a controllable annealing of electrospun precursor fibers at different temperatures. The crystal structure, morphology, pore structure and photocatalytic properties of as-made porous BiVO4 fibers were systematically investigated. The results show that the final products have fibrous morphology and the phase structure of porous fibers belongs to monoclinic scheelite structure. The crystallinity and crystalline size increases, but the specific surface area decrease with increasing calcination temperature. These porous fibers all exhibit good optical absorption in visible light. As the sample calcined at 500 °C has larger specific surface area and better crystallinity, it exhibits the best photodegrading properties for rhodamine B solution.
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高影响因子
Frontiers of Materials Science
·
2018
·Vol. 12
·期 2
·118-128
·
IF 1.478
Wang Qian,Meng Guihua,Wu Jianning,Wang Yixi,Liu Zhiyong,Guo Xuhong
We fabricated pH and light dual-responsive adsorption materials which could induce the transition of surface wettability between hydrophobicity and hydrophilicity by using ATRP. The structure and morphology of adsorption materials were confirmed by ATR-FTIR, XPS, TGA and SEM. It showed that the modified cellulose (CE)-based foam was hydrophobic, which can adsorb a range of oils and organic solvents in water under pH = 7.0 or visible light irradiation ( λ > 500 nm). Meanwhile, the wettability of robust CE-based foam can convert hydrophobicity into hydrophilicity and underwater oleophobicity under pH = 3.0 or UV irradiation ( λ = 365 nm), giving rise to release oils and organic solvents. Most important of all, the adsorption and desorption processes of the modified CE-based foam could be switched by external stimuli. Furthermore, the modified CE-based foam was not damaged and still retained original performance after reversible cycle repeated for many times with variation of surface wettability. In short, it indicates that CE-based foam materials with switchable surface wettability are new responsive absorbent materials and have owned potential application in the treatment of oil recovery.
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高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 44
·17972-17977
·
IF 5.101
Pengtao Shao,Hongzhi Wang,Qinghong Zhang,Yaogang Li
Mn-doped ZnSe nanocrystals (Mn:ZnSe d-dots) that emit white light were synthesized in aqueous media in microfluidic reactors. White light emission from Mn:ZnSe d-dots was a result of combined emission of blue light (emission from non-coordinated surface selenium sites) and yellow light (4T1 → 6A1 emission from Mn2+ ions). Emission from non-coordinated surface selenium sites was realized by adjusting the ratio of the flow volumes of [Zn]/[Mn] and the mass of stabilizer added. Photoluminescence from the Mn:ZnSe d-dots was easily tuned from 580 to 602 nm by regulating flow volume. Under the optimal experimental conditions, Mn:ZnSe d-dots that emit white light with a quantum yield of about 10.2% were fabricated.
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DOI
高影响因子
危险品化学品经营许可证（带存储）