Nanomaterials
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2019
·Vol. 9
·期 1
·65
·
IF 4.034
Jiquan Li,Youyan Wang,Huan Ling,Ye Qiu,Jia Lou,Xu Hou,Sankar Parsad Bag,Jie Wang,Huaping Wu,Guozhong Chai
Bismuth ferrite (BiFeO3, BFO) submicron cubes and 3D BFO/graphene composite materials were synthesized by a simple hydrothermal process. The crystallization processes of the 3D BFO/graphene composites with different graphene oxide (GO) concentrations were studied for their visible light photocatalytic properties. Compared to the single BFO submicron cubes, 3D BFO/graphene composites have greatly improved photocatalytic activity. A high photocatalytic performance is obtained at a GO concentration of 3 mg/mL, with the degradation rate of methylene blue (MB) dye reaching up to 92% in 140 min. The enhancement of photocatalytic activity can be attributed to the large specific surface area and 3D architecture of 3D composites, which provide more transport paths to effectively improve the separation rate of photo-generated electrons and holes. Therefore, 3D BFO/graphene composites have a broad prospect of application in the field of photocatalysis.Keywords:BiFeO3;hydrothermal;photocatalysis;methylene blue
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Materials Research Express
·
2019
·Vol. 6
·期 8
·085705
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IF 1.449
Bin-bin Wang,Fang Lai,Peng Zhang
Thermosetting polyurethanes (PUs) with the enhanced mechanical properties were facilely prepared without the catalysts by a simple two-step method. With the introduction of Phenylenediamine (PDA), the increasing visible-light transmittance for thermosetting PUs was observed and outstanding UV shielding properties were confirmed by TiO2 photocatalytic degradation of Rhodamine B. Moreover, the light-extended shielding behaviors in UV–vis region for thermosetting PUs were achieved by regulating the chain extenders of Benzidine (BDI), which were demonstrated by the compared experiments of TiO2 photocatalytic degradation of Rhodamine B protected by PU@BDI films. In addition, the repeatable mechanical behaviors for PUs were also obtained owing to the reconstruction of molecular crosslinking networks of PUs by the exchange of the urethane-urea covalent bond. Finally, we can conclude that thermosetting PUs provided with the enhanced mechanical properties and the promising applications in tunable UV–vis shielding.
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ADVANCED FUNCTIONAL MATERIALS
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2019
·Vol. 29
·期 35
·1903155
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IF 15.621
Chun-Ta Wang,Keqiang Chen,Ping Xu,Fion Yeung,Hoi-Sing Kwok,Guijun Li
Halide perovskites have received tremendous attention due to their fantastic optical and electrical properties. Here, circularly polarized light emission is successfully demonstrated using a simple configuration consisting of inorganic perovskite nanocrystals embedded within a predefined handedness cholesteric superstructure stack. The helical structured cholesteric liquid crystal film acts as a selective filter to transform the unpolarized light emission from perovskite nanocrystals into circularly polarized luminescence. The transformation is accompanied by an extraordinary dissymmetry factor (| g lum |) up to 1.6, well-defined handedness, high photoluminescence quantum yield, and full-color availability. Furthermore, the circularly polarized luminescence is angular dependent and can easily be modulated by shifting the overlap of the reflection band and the emission band. The proposed method is more straightforward and powerful than the previous approaches, offering new opportunities in optoelectronic and photonic devices.
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ORGANIC ELECTRONICS
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2019
·
IF 3.495
Yanting Wu,Zewu Xiao,Yajun Lian,Lihong He,Xiaoli Yang,Qi Wang,Jie Ren,Guoqing Li,Xiaohui Yang
Inorganic charge transporting materials offer numerous advantages over their organic counterparts, including high charge carrier mobility , stability, simple preparation, and low cost, and have been studied for perovskite optoelectronic devices. However, the majority of these materials strongly quench perovskite luminescence, which is detrimental to the performance of perovskite light-emitting devices. To overcome this and obtain good quality perovskite films, an organic interlayer modified with UV ozone is used. The effects of the UV ozone treatment on the energetics and chemical structures of the organic interlayer are examined. On the basis of this strategy, we fabricate perovskite light-emitting devices that contain a cuprous thiocyanate hole injection layer, which exhibit an improved external quantum efficiency of 10.2% and greater operational stability when compared with the devices that contain a conducting-polymer hole injection layer.
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ANALYTICAL CHEMISTRY
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2019
·
IF 6.35
Yufeng Liu,Min Zhou,Wen Cao,Xiaoyu Wang,Quan Wang,Sirong Li,Hui Wei
Nanomaterials with enzyme-like characteristics (nanozymes) have been developed to mimic enzymes because of their low cost, high stability, and large-scale production. By using light as an external stimulation, one can modulate nanozymes’ catalytic activities with controlled spatial and temporal precision. A few inorganic photoactive materials have been investigated to construct light-responsive oxidase-like nanozymes. However, these materials suffered from limited absorbance of visible light. To address this challenge, herein we have developed a photosensitized metal–organic framework (PSMOF) by using a derivative of Ru(bpy)32+ with stronger visible-light absorption as a PS linker. The PSMOF exhibited excellent oxidase-like activity, which could be modulated by switching light on and off. Moreover, the PSMOF was used to detect glutathione levels in both normal and cancer cells with good selectivity and high sensitivity. This study not only provides a smart strategy to modulate nanozymes’ activities but also broadens the sensing applications of nanozymes.
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Materials Research Express
·
2019
·Vol. 6
·期 6
·065510
·
IF 1.449
Xueliang Jiang,Yanrong Gao,Chenjian Li,Feng You,Junlong Yao,Yuchun Ji,Yuhong Zhang,Chu Yao
Using melamine-formaldehyde polymer microspheres as templates, yttrium-doped TiO2 hollow spheres (Y-TiO2HS) were successfully prepared via a sol-gel method. The as-syntheszied samples were characterized by Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, x-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–vis diffuse reflectance spectrum, luminescence spectrum, specific surface area (BET) analysis and porosity analysis. The results indicate that Y doping could increase the thermal stability, reduce the band gap and enhance photocatalytic activity of the TiO2. When the Y doping molar ratio was 1.5%, the Y-TiO2HS presented high surface area (62.651 m2 g−1) and photocatalytic degradation rate (about 70%). The corresponding BET value and the degradation rate of Y-TiO2HS increased by 3 times and 50%, respectively, compared with those of un-doped TiO2HS.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 10
·7702-7718
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IF 3.442
Li Wei,Wu Gang,Tan Jinhui,Zhu Yuntao,Yu Xufeng,Lei Yang,Sun Gang,You Bo
A novel robust self-healing superhydrophobic F-SiO 2 /Fe 3 O 4 /EP(epoxy)/PCL nanocomposite film was fabricated through a facile two-step method including resin spraying and NPs perpendicular gradient deposition. Specially, the epoxy/polycaprolactone (EP/PCL) mixed resin matrix was prepared through a spraying process and the functioned silica/magnetic iron oxide (F-SiO 2 /Fe 3 O 4 ) nanoparticles were then deposited on the resin matrix by gradient distribution under gravity and solvent evaporation. The THF/ethanol mixture solvent which acted as film microstructure-directing agent guided the F-SiO 2 /Fe 3 O 4 nanoparticles gradient distribution in the nanocomposite films. The results showed that the cutting cracks on the nanocomposite film could be rapidly self-healed and the film would maintain its superhydrophobicity after irradiation by near-infrared light. The nanocomposite films, especially the F-SiO 2 (8.5wt%)/Fe 3 O 4 (1.0wt%)/EP/PCL nanocomposite film, showed high resistant properties on abrasion, corrosive liquids and UV irradiation. The recovery mechanism of the nanocomposite films was also investigated.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 10
·9087-9096
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IF 2.195
Liu Minmin,Yu Shuili,Hou Li-an,Hu Xiaojun
A series of Fe 2 O 3 and TiO 2 immobilized on NZVI modified zeolite composites ((n)Fe 2 O 3 –TiO 2 /FeZ) were synthesized by a one-pot hydrothermal method combined with calcination for oxytetracycline (OTC) removal. Some of the zero valent iron particles (NZVI) were impregnated into the framework of zeolite X by hydrothermal method and others were oxidized to Fe 2 O 3 through calcination. The TiO 2 and Fe 2 O 3 particles were immobilized on the surface of zeolite X. Compared with pure Fe 2 O 3 –TiO 2 , the OTC adsorption and photocatalytic degradation efficiency of (n)Fe 2 O 3 –TiO 2 /FeZ increased sharply. As the weight ratio of NZVI to TiO 2 was six and four, the sample had the highest adsorption efficiency (95%) and showed the highest total efficiency (98%) via adsorption and visible light—driven photocatalytic activity for the degradation of OTC, respectively. The materials also had good cyclic stability and the removal efficiency reached up to above 80% after four runs. In addition, the photocatalytic mechanism was proposed. The improved photocatalytic activities and stabilities of (n)Fe 2 O 3 –TiO 2 /FeZ for OTC degradation were ascribed to the enhanced adsorption capacity of FeZ, the strong absorbance in the visible light region and improved photo-induced charge carriers separation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Qi Wang,Hong Wu,Qiaoyuan Gao,Dagang Lin,Yongjie Fan,Ran Duan,Yanqing Cong,Yi Zhang
Plasmonic Bi 0 modified BiOI-Bi 2 O 3 composite (Bi/BiOI-Bi 2 O 3 ) was prepared via in situ UV reduction method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) techniques were carried out to identify the formation of semimetal Bi 0 . The results indicated that the dot-like bismuth particles were originated from the partial reduction of lattice Bi 3+ to Bi 0 by accumulated conduction band electrons in BiOI-Bi 2 O 3 . The as-prepared ternary composite exhibited enhanced visible-light-response, decreased charge transfer impedance and higher charge carrier density relative to unmodified BiOI-Bi 2 O 3 . Due to synergistic effect between plasmonic Bi 0 and BiOI-Bi 2 O 3 heterojunction , dramatically enhanced photocatalytic activity for phenol degradation can be achieved. After 3.5 h visible light irradiation, the value for phenol removal efficiency was ca. 60% and 100% on BiOI-Bi 2 O 3 and Bi/BiOI-Bi 2 O 3 , respectively. The calculated zero-order rate constant on Bi/BiOI-Bi 2 O 3 was 1.7 and 3.9 times that on BiOI-Bi 2 O 3 and Bi 2 O 3 , respectively. In addition to phenol, organic dyes (zwitterionic RhB , cationic MB and anionic Org II) were also used as model pollutants. Pronounced photocatalytic degradation by Bi/BiOI-Bi 2 O 3 can be observed, further confirming the importance of Bi 0 . Trapping experiments using different scavengers indicated that photogenerated holes were major active species during the degradation of phenol. Furthermore, good stability was also observed in 5 successive cyclic runs. This study opens a new strategy for in situ preparation of plasmonic Bi 0 modified composite.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Youyou Hu,Zhengkui Li,Jianhua Yang,Hongjie Zhu
A novel hydrogel photocatalyst (p(HEA-APTM)-BiOI) was synthesized by irradiation polymerization and chemical precipitation method, while employed as peroxymonosulfate (PMS) activator to enhance methylparaben (MP) degradation. The structure, morphology and physicochemical properties of the prepared p(HEA-APTM)-BiOI were characterized by XRD, XPS, SEM, TEM, FTIR and BET. The experimental results revealed that the MP catalytic degradation by p(HEA-APTM)-BiOI activated PMS can achieve the best performance under the visible light irradiation. In addition, the parameters including the molar radio of [PMS]/[MP], initial pH, Cl − and HCO 3 − were also investigated in detail. It was worth noting that p(HEA-APTM)-BiOI also effectively eliminated MP in the absence of visible light. Based on the quenching experiment, 1 O 2 , h + and O 2 − were determined as the dominant active species contributing to the catalytic oxidation process in the p(HEA-APTM)-BiOI/PMS/Vis system, and the possible degradation mechanism was also elaborated. Eventually, the possible pathways of MP degradation were deduced from several intermediates identified by HPLC-MS.
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Wang Shaolei,Xu Min,Peng Tianyou,Zhang Chengxin,Li Tao,Hussain Irshad,Wang Jingyu,Tan Bien
Significant efforts have been devoted to develop efficient visible-light-driven photocatalysts for the conversion of CO 2 to chemical fuels. The photocatalytic efficiency for this transformation largely depends on CO 2 adsorption and diffusion. However, the CO 2 adsorption on the surface of photocatalysts is generally low due to their low specific surface area and the lack of matched pores. Here we report a well-defined porous hypercrosslinked polymer-TiO 2 -graphene composite structure with relatively high surface area i.e., 988 m 2 g −1 and CO 2 uptake capacity i.e., 12.87 wt%. This composite shows high photocatalytic performance especially for CH 4 production, i.e., 27.62 μmol g −1 h −1 , under mild reaction conditions without the use of sacrificial reagents or precious metal co-catalysts. The enhanced CO 2 reactivity can be ascribed to their improved CO 2 adsorption and diffusion, visible-light absorption, and photo-generated charge separation efficiency. This strategy provides new insights into the combination of microporous organic polymers with photocatalysts for solar-to-fuel conversion.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 8
·2212-2218
·
IF 6.641
Wei Cai,Ting Zhang,Meng Xu,Miaoran Zhang,Yongjian Guo,Lipeng Zhang,Jason Street,Wee-Jun Ong,Quan Xu
White light-emitting diode (WLED) devices are replacing the filament lamp and can provide a light close to natural sunlight, and they have thus drawn considerable attention in recent years. It remains a scientific challenge to develop WLEDs using environmentally friendly, easy-to-process and cost-effective phosphors. Here we synthesized blue-, green- and red-carbon dots (denoted as B-, G- and R-CDs) by a facile solvothermal method with high dispersity both in an aqueous and organic solvent. The quantum yield (QY) of the R-CDs was up to 24.7%. These CDs can be easily dissolved in polyvinylpyrrolidone (PVP) colloid, leading to the production of ultraviolet (UV)-excited LED devices to avoid the retinal damage caused by blue ray excitation. The fluorescence emission of the WLED has a wide band, covering the whole visible light region. Importantly, the influence of doping that gives rise to the change of emissive colors has been elucidated by X-ray photoelectron spectroscopy (XPS) combined with a computational method in order to provide a systematic controllable tuning on the functionalization of CDs. As such, WLEDs were demonstrated with color coordinates of (0.33, 0.33), and a color temperature of 5612 K in the CIE chromaticity diagram with good anti-photobleaching and a color rendering index (CRI) of 89.
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