JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 24
·2934-2941
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IF 1.815
Hongxu Guo,Di Guo,Zishan Zheng,Weng Wen,Jianhua Chen
Zn3(VO4)2 nanorods with visible light-driven photocatalytic activity were prepared by hydrothermal reaction and characterized by x-ray diffraction, Fourier transform infrared, scanning electron microscopy, x-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectra, and Brunauer–Emmett–Teller surface area and pore size analyzer. The Zn3(VO4)2 nanorods consisted of rods with a thickness of approximately 30 nm, length in the range 400–600 nm, and width in the range 150–250 nm. The photocatalytic degradation activities for methylene blue (MB) and 4-nitrophenol (4-NP) over the Zn3(VO4)2 nanorods were studied in detail. The photocatalytic activity of the as-prepared photocatalyst for MB and 4-NP in visible light under the same conditions was about 3.5 times and 2.5 times higher than that of N–TiO2, respectively. The main active species in the photodegradation come from •OH, and the photogenerated electrons also partly involved in the photocatalytic degradation process, in which the •OH radicals formed were in proportional to the light illumination time obeying zero-order reaction rate kinetics.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2013
·
IF 5.825
Shulian Wang,Wanhong Ma,Yanfen Fang,Manke Jia,Yingping Huang
Bismuth oxybromide (BiOBr) was prepared and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (DRS). The BiOBr promoted detoxification of cylindrospermopsin (CYN) under UV ( λ < 350 nm) and visible light ( λ > 420 nm) illumination was studied. The results revealed that the toxic uracil unit of CYN was removed, and the carboxylic group of the degraded product was also decomposed, to give the innoxious tricyclic guanidine product under the title conditions. In contrast, the traditional Fenton reagents (Fe 2+ and H 2 O 2 ) limited to remove the uracil moiety of CYN with the carboxylic group intact. Presumably, the decarboxylation ability of BiOBr was induced by Br 4 p valence band hole ( h Br 4 p + ), and the degradation mechanism was also proposed based on the experimental results and theoretical calculation.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 3
·1324-1332
·
IF 2.371
Jia Lei,Zhou Tao,Xu Jun,Xu Zhouqing,Zhang Mingming,Wang Yuan,Li Zhongyue,Zhu Taofeng
Lanthanide complexes have attracted increased attention in recent years for their unique photophysical properties such as large Stokes shifts, narrow bandwidth, long radiative lifetimes, and high luminescence quantum yield. However, low photochemical stability and poor mechanical properties limit the technological applicability of lanthanide complexes. Two natural clay minerals, fibrillar palygorskite (Pal) and tubular halloysite nanotubes (HNTs), are known for their extreme stabilities and high surface area and show promise as new carriers of luminescent lanthanide complexes for further applications. In this report, clay-based lanthanide polymer nanocomposites clay–polyethyleneimine (PEI)–MPTP–Eu(DBM) 3 have been fabricated by attaching a lanthanide complex onto the surface of PEI-modified Pal or HNTs. The formed nanocomposites display visible light-excitable features with a wide excitation wavelength range from UV to visible light, a long luminescence lifetime, and improved photoluminescence stability. Their excellent luminescence, high suspension stability, and low cytotoxicity in cell studies result in the potential applications of the as-prepared nanocomposites for cell imaging in biological systems.
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RSC Advances
·
2015
·Vol. 5
·期 27
·21237-21241
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IF 3.84
Guoqiang Zhang,Zhao Zhao,Huaqiao Tan,Haifeng Zhao,Dan Qu,Min Zheng,Weixing Yu,Zaicheng Sun
Hierarchical TiO2 spheres composed of nanosheets are successfully synthesized via a simple solvothermal route. TiO2 spheres with high surface area (∼100 m2 g−1) exhibit excellent photocatalytic activity. Au nanoparticles are loaded on the surface of TiO2 nanosheets through anchor molecules – thiolglycolic acid. The LSPR absorption band at ∼550 nm of Au nanoparticles is clearly observed in the diffusion reflective UV-Vis spectra. H2 production results show that the TiO2 spheres have higher photocatalytic activity than commercial P25 TiO2. After loading with Au nanoparticles, TiO2–Au spheres display a 27.6 μmol (g−1 h−1) H2 production rate under visible light irradiation (λ > 420 nm) because the localized surface plasmon resonance (LSPR) of Au nanoparticles enhances the visible light absorption. Furthermore, the H2 production rate could be improved to 92.4 μmol (g−1 h−1) for TiO2 spheres loaded with both Au and Pt nanoparticles. Based on these results, we propose a possible mechanism. Under UV light, TiO2 absorbs UV light and generates excited electrons, passing to Au nanoparticles for H2 production. In the case of visible light irradiation, the hot electrons are generated from Au nanoparticles due to the LSPR effect. And then the hot electrons are transferred from the Au nanoparticles to TiO2 and cocatalyst Pt nanoparticles for H2 generation.
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Nanoscale
·
2015
·Vol. 8
·期 1
·395-402
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IF 7.394
Jiale Liu,Zhennan Wu,Tingting Li,Ding Zhou,Kai Zhang,Yu Sheng,Jianli Cui,Hao Zhang,Bai Yang
Electrophoretic deposition (EPD) is a conventional method for fabricating film materials from nanometer-sized building blocks, and exhibits the advantages of low-cost, high-efficiency, wide-range thickness adjustment, and uniform deposition. Inspired by the interest in the application of two-dimensional (2D) nanomaterials, the EPD technique has been recently extended to building blocks with 2D features. However, the studies are mainly focused on simplex building blocks. The utilization of multiplex building blocks is rarely reported. In this work, we demonstrate a controlled EPD of Cu and Au sheets, which are 2D assemblies of luminescent Cu and Au nanoclusters. Systematic investigations reveal that both the deposition efficiency and the thickness are determined by the lateral size of the sheets. For Cu sheets with a large lateral size, a high ζ-potential and strong face-to-face van der Waals interactions facilitate the deposition with high efficiency. However, for Au sheets, the small lateral size and ζ-potential limit the formation of a thick film. To solve this problem, the deposition dynamics are controlled by increasing the concentration of the Au sheets and adding acetone. This understanding permits the fabrication of a binary EPD film by the stepwise deposition of Cu and Au sheets, thus producing a luminescent film with both Cu green emission and Au red emission. A white light-emitting diode prototype with color coordinates (x, y) = (0.31, 0.36) is fabricated by employing the EPD film as a color conversion layer on a 365 nm GaN clip and further tuning the amount of deposited Cu and Au sheets.
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ChemCatChem
·
2015
·Vol. 8
·期 3
·615-623
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IF 4.556
Fangfang Wu,Meilin Lv,Xiaoqin Sun,Yinghao Xie,Hongmei Chen,Shuang Ni,Gang Liu,Xiaoxiang Xu
Graphical Catching the rays : Nitrogen doping is an efficient approach to endow the wide-band-gap semiconductor Sr 4 Nb 2 O 9 with visible-light responses. Efficient photocatalytic oxygen production from water is achieved with this N-doped Sr 4 Nb 2 O 9 under visible-light illumination, which is influenced strongly by synthetic conditions. DFT calculations reveal the critical role of nitrogen, which forms additional energy levels within the band gap of Sr 4 Nb 2 O 9 . Photocatalytic water splitting is an appealing process for solar energy conversions yet it is often limited by the slow oxidation of water to oxygen half-reaction. Here we performed an investigation on N-doped Sr 4 Nb 2 O 9 as a water oxidation photocatalyst. Our results show that N doping is an effective approach to improve the visible-light response of Sr 4 Nb 2 O 9 . Efficient photocatalytic oxygen production was observed after N doping, and the highest production rate of ∼27 μmol h −1 under visible-light irradiation corresponds to an apparent quantum efficiency of ∼0.31 %. Clear anodic photocurrent can be generated under visible-light illumination, and the flat-band potential was determined to be ∼−1.25 V vs. Ag/AgCl at pH 7. Theoretical calculations reveal that N doping introduces additional valence bands and is responsible for the visible-light response. Variations in light absorption and photo-oxidation performance can be controlled by modifying these valence band positions using different nitridation temperatures.
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Science China-Chemistry
·
2014
·Vol. 57
·期 7
·1026-1031
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IF 1.516
Miao XiangMin,Feng ZhaoZhong,Tian Jun,Peng Xue
Glucose is directly related to brain activity and to diabetes. Therefore, developing a rapid and sensitive method for glucose detection is essential. Here, label-free glucose detection at attomole levels was realized by detecting the average diameter change of gold nanoparticles (AuNPs) utilizing dynamic light scattering (DLS). Single-strand DNA (ssDNA) adsorbed into the AuNPs’ surfaces and prevented them from aggregating in solution that contained NaCl. However, ssDNA cleaved onto ssDNA fragments upon addition of glucose, and these fragments could not adsorb onto the AuNPs’ surfaces. Therefore, in high-salt solution, AuNPs would aggregate and their average diameter would increase. Based on monitoring the average diameter of AuNPs with DLS, glucose could be detected in the range from 15 pmol/L to 2.0 nmol/L, with a detection limit of 8.3 pmol/L. Satisfactory results were also obtained when the proposed method was applied in human serum glucose detection.
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LANGMUIR
·
2015
·
IF 4.457
Lei Zhang,Liwei Dai,Yun Rong,Zhenzhong Liu,Dingyi Tong,Youju Huang,Tao Chen
A photoresponsive amphiphilic gold nanoparticle (AuNP) is achieved through the decoration of AuNP with hydrophilic poly(ethylene glycol) (PEG) and hydrophobic photoresponsive polymethacrylate containing spiropyran units (PSPMA). Owing to the photoresponsive property of spiropyran units, the amphiphilic AuNPs can easily achieve the controllable assembly/disassembly behaviors under the trigger by light. Under visible light, spiropyran units provide weak intermolecular interactions between neighbored AuNPs, leading to isolated AuNPs in the solution. While under UV light irradiation, spiropyran units in the polymer brushes transform into merocyanine isomer with conjugated structure and zwitterionic state, promoting the integration of adjacent AuNPs through π–π stacking and electrostatic attractions, further leading to the formation of Au oligomers. The smart reversible AuNP oligomers exhibited switchable plasmonic coupling for tuning surface-enhanced Raman scattering (SERS) activity, which is promising for the application of SERS based sensors and optical imaging.
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ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Guisheng Li,Bo Jiang,Xin Li,Zichao Lian,Shuning Xiao,Jian Zhu,Dieqing Zhang,Hexing Li
Fullerene (C60)-enhanced Bi2TiO4F2 hierarchical microspheres were prepared by a facile solvothermal method. Compared to the pure Bi2TiO4F2 photocatalyst, the C60/Bi2TiO4F2 samples exhibit much stronger photocatalytic performance for degrading Rhodamine B (RhB) and Eosin Y (EY) under visible light irradiation. Such greatly enhanced photocatalytic activity may be ascribed to strong combination and heterojunctions between C60 and Bi2TiO4F2, favorable for charge separation and light adsorption. Loading C60 on Bi2TiO4F2 results in a new photocatalytic mechanism (based on photo-generated hvb+ and ·O2- radicals) different from that of pure Bi2TiO4F2.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 48
·24261-24271
·
IF 7.443
Jie Xu,Sha He,Hualei Zhang,Jiancai Huang,Huaxiang Lin,Xuxu Wang,Jinlin Long
A layered nanoarchitecture composed of photoactive MOFs of UiO-66-NH2 and graphene was facilely fabricated herein by an innovative strategy, which utilizes a noncovalent methodology for graphene functionalization combined with in situ self-assembling and a solvothermal synthesis technique. The fabricated hybrids were characterized and evaluated in detail by the selective photocatalytic oxidation of benzyl alcohol under visible light. The hybrid displayed improved efficiency with high selectivity, compared with the parent MOF. The characterization results clearly demonstrate that this originates from the sandwich-like hierarchical nanoarchitecture formed by the compact interaction between UiO-66-NH2 and graphene via the adopted mediator. The synthesis strategy was also proven effective in building the rGO/NH2-MIL-125(Ti) hierarchical nanoarchitecture. Thus, this work offers a general strategy for constructing MOF/graphene sandwich heterostructures, which have great potential in the fields of electronics, optics, optoelectronics, and photoconversion.
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ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Ding Wei,Lihua Yao,Song Yang,Zhentao Cui,Bingxue Wei,Minhua Cao,Changwen Hu
In2TiO5, containing both early transition metal (d0) and p-block metal (d10), is a very promising candidate for possible application in H2 production because of its suitable edges of conduction and valence bands and the crystal structure, which is considered to favor mobility of charge carriers. Herein we report, for the first time, the synthesis of novel oxygen vacancies (OV), N-doped In2TiO5 (OV,N–In2TiO5) with controllable band gap. The resultant OV,N–In2TiO5 sample was prepared by a multistep sol–gel calcination process and studied as a near-infrared (NIR) light-driven photocatalyst for H2 production. OV and N-doping can effectively extend the photoresponse of In2TiO5 to the NIR region due to an interband springboard and the reduced band gap, thus leading to efficient NIR light photocatalytic H2 production activity with Pt as a cocatalyst.
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DYES AND PIGMENTS
·
2015
·
IF 3.966
Jintai Lin,Xuan Xu,Wohua Zhou,Liudan Yu,Qianming Wang
Reaction of quinolone type antibiotics (enrofloxacin, ciprofloxacin, norfloxacin and ofloxacin) with lanthanide ions (Eu 3+ and Tb 3+ ) afforded eight kinds of complexes that can be dissolved in water. These compounds possess not only the advantages of long excited state lifetimes, but also allow excitation in the visible light range depending on the concentration variation. Especially the excitation wavelength of the terbium complexes can be extended into 405 nm. Theoretical studies demonstrated that the calculated energy gaps between HOMO and LUMO+1 orbital could be reduced and a dimeric structure was formed during the concentration experiments. Moreover, uniform and long rod-like structures (diameter: 100 nm; length: 10 μm) were achieved and concentration dependence has been investigated. The strategy of combining lanthanide characteristic emission nature and longer wavelength excitations can be applicable to the development of luminescent devices with controllable shapes.
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