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Ekaterina A Dolgopolova, Allison M Rice, Corey R Martin, Natalia B Shustova
In this review, we highlight how recent advances achieved in the fields of photochemistry and photophysics of metal-organic frameworks (MOFs) could be applied towards the engineering of next generation MOF-based sensing devices. In addition to high surface area and structural tunability, which are crucial for efficient sensor development, progress in the field of MOF-based sensors could rely on the combination of MOF light-harvesting ability, understanding energy transfer processes within a framework, and application of MOF-based photocatalysis towards sensing enhancement...
March 16, 2018: Chemical Society Reviews
Beata Bajorowicz, Marek P Kobylański, Anna Gołąbiewska, Joanna Nadolna, Adriana Zaleska-Medynska, Anna Malankowska
Quantum dot (QD)-decorated semiconductor micro- and nanoparticles are a new class of functional nanomaterials that have attracted considerable interest for their unique structural, optical and electronic properties that result from the large surface-to-volume ratio and the quantum confinement effect. In addition, because of QDs' excellent light-harvesting capacity, unique photoinduced electron transfer, and up-conversion behaviour, semiconductor nanoparticles decorated with quantum dots have been used widely in photocatalytic applications for the degradation of organic pollutants in both the gas and aqueous phases...
February 20, 2018: Advances in Colloid and Interface Science
Mandeep Singh, Deshetti Jampaiah, Ahmad E Kandjani, Ylias M Sabri, Enrico Della Gaspera, Philipp Reineck, Martyna Judd, Julien Langley, Nicholas Cox, Joel van Embden, Edwin L H Mayes, Brant C Gibson, Suresh K Bhargava, Rajesh Ramanathan, Vipul Bansal
Oxygen vacancies in inorganic semiconductors play an important role in reducing electron-hole recombination, which may have important implications in photocatalysis. Cuprous oxide (Cu2O), a visible light active p-type semiconductor, is a promising photocatalyst. However, the synthesis of photostable Cu2O enriched with oxygen defects remains a challenge. We report a simple method for the gram-scale synthesis of highly photostable Cu2O nanoparticles by the hydrolysis of a Cu(i)-triethylamine [Cu(i)-TEA] complex at low temperature...
March 15, 2018: Nanoscale
Jiaqi Zhang, Zipeng Xing, Jiayi Cui, Zhenzi Li, Siyu Tan, Junwei Yin, Jinlong Zou, Qi Zhu, Wei Zhou
Herein, C,N co-doped porous TiO2 hollow sphere visible light photocatalysts were fabricated using biocompatible N-lauroyl-l-glutamic acid as a doped precursor and soft-template by a mild and facile self-assembly soft-template method, followed by calcination at 550 °C in air. The structure, morphology, and surface elemental composition were characterized in detail by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy...
March 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Ting He, Bing Ni, Simin Zhang, Yue Gong, Haiqing Wang, Lin Gu, Jing Zhuang, Wenping Hu, Xun Wang
Synthesizing ultrathin 2D metal-organic framework nanosheets in high yields has received increasing research interest but remains a great challenge. In this work, ultrathin zirconium-porphyrinic metal-organic framework (MOF) nanosheets with thickness down to ≈1.5 nm are synthesized through a pseudoassembly-disassembly strategy. Owing to the their unique properties originating from their ultrathin thickness and highly exposed active sites, the as-prepared ultrathin nanosheets exhibit far superior photocatalysis performance compared to the corresponding bulk MOF...
March 13, 2018: Small
Yusuke Asakura, Yuto Anada, Ryo Hamanaka, Tsugio Sato, Ken-Ichi Katsumata, Xiaoyong Wu, Shu Yin
Various types of coating films were obtained from hydrothermally synthesized Nb-doped TiO<sub>2</sub> (NTO) and Cs<sub><i>x</i></sub>WO<sub>3</sub> (CWO) nanoparticles. The coating films possessed multifunctionality including near infrared absorption and photocatalysis abilities. The NTO and CWO nanoparticles were synthesized by a unique solvothermal reaction in which water induced by esterification reaction between alcohol and carboxylic acid can act as a hydrolyzing agent for metal precursors...
March 12, 2018: Nanotechnology
Wen-Wen Yong, Huan Lu, Han Li, Shu Wang, Ming-Tian Zhang
Artificial photosynthesis is a chemical process that seeks to capture energy from sunlight to produce solar fuels. Light absorption by a robust and efficient photosensitizer is one of the key steps in solar energy conversion. However, common photosensitizers, including [Ru(bpy)3]2+, remain far from the ideal. In this work, we exploited the performance of conjugated polymers (CPs) as photosensitizers in photodriven hydrogen evolution in aqueous solution (pH 6). Interestingly, CPs, such as poly(fluorene-co-phenylene) derivative (PFP, 429 mmolH2•gCP-1•h-1), exhibit steady and high reactivity towards hydrogen evolution; this performance can rival that of a phosphonated [Ru(bpy)3]2+ (RuP) under the same conditions, indicating that CPs are promising metal-free photosensitizers for future application in photocatalysis...
March 12, 2018: ACS Applied Materials & Interfaces
Yongbing Lou, Yake Zhang, Lin Cheng, Jinxi Chen, Yixin Zhao
he localized surface plasmon resonance (LSPR) effect has been widely utilized in photocatalysis, but most reported LSPR materials are based on noble metals of Au or Ag with high chemical stability. The plasmonic Cu nanoparticles exhibiting LSPR absorbance locating at 600 nm are promising for lots of applications such as photocatalysis. Unfortunately, plasmonic Cu nanoparticles are bothered by their serious surface oxidation in air. Herein, a novel lollipop-shaped Cu@Cu2O/ZnO heterojunction nanostructure was designed, for the first time, to stabilize the plasmonic Cu core by decorating ZnO nanorods onto Cu@Cu2O core-shell structures...
March 12, 2018: ChemSusChem
Deivisson Lopes Cunha, Alexei Kuznetsov, Carlos Alberto Achete, Antonio Eduardo da Hora Machado, Marcia Marques
Heterogeneous photocatalysis using titanium dioxide as catalyst is an attractive advanced oxidation process due to its high chemical stability, good performance and low cost. When immobilized in a supporting material, additional benefits are achieved in the treatment. The purpose of this study was to develop a simple protocol for impregnation of TiO2 -P25 on borosilicate glass spheres and evaluate its efficiency in the photocatalytic degradation using an oxidizable substrate (methylene blue), in a Compound Parabolic Concentrator (CPC) reactor...
2018: PeerJ
Qi Pei, Xiaocha Wang, Ji-Jun Zou, Wenbo Mi
As a research upsurge, van der Waals (vdW) heterostructures give rise to numerous combined merits and novel applications in nanoelectronics fields. Here, we systematically investigate the electronic structure of MnPSe3/CrSiTe3 vdW heterostructures with various stacking patterns. Then, particular attention of this work is paid on the band structure modulations in MnPSe3/CrSiTe3 vdW heterostructures via biaxial strain or electric field. Under a tensile strain, the relative band edge positions of heterostructures transform from type-I (nested) to type-II (staggered)...
March 9, 2018: Nanotechnology
Joseph DuChene, Giulia Tagliabue, Alex J Welch, Wen-Hui Cheng, Harry A Atwater
Harvesting non-equilibrium hot carriers from plasmonic-metal nanostructures offers unique opportunities for driving photochemical reactions at the nanoscale. While examples of hot electron-driven processes abound, the realization of plasmonic systems capable of harvesting hot holes from metal nanostructures has eluded the nascent field of plasmonic photocatalysis. Here, we fabricate gold/p-type gallium nitride (Au/p-GaN) Schottky junctions tailored for photoelectrochemical studies of plasmon-induced hot hole capture and conversion...
March 9, 2018: Nano Letters
(no author information available yet)
A new photocatalyst bismuth oxo citrate was synthesized by facile precipitation process with calcination at 200 ºC. Thephotocatalyst was characterized by SEM, XRD, FTIR, N2 sorptometry and elemental analysis. Morphologically, it is composed of polyhedral particles with different, irregular shapes and sizes. SSA of the photocatalyst was 8.92 m2 g-1. It showed very good photocatalytic performance and reusability. Total decolorization of RB19 was achieved in less than 10 min, which is much faster in comparison with TiO2 P25...
January 26, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
(no author information available yet)
The presence of pharmaceuticals in water resources has alarmed water and health authorities. In this study, ultraviolet(UV)-based oxidation was evaluated to decompose sulfamethoxazole, ibuprofen, and triclosan in comparison. In particular, as an alternative UV source to problematic conventional mercury lamps, light emitting diode (LED), so-called UV-LED, was evaluated for the decomposition of the pharmaceuticals in water under various conditions varying UV wavelength, irradiation intensity, reaction pH, and TiO2 loading...
February 16, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
Zhixin Zhou, Yuye Zhang, Yanfei Shen, Songqin Liu, Yuanjian Zhang
As a promising two-dimensional (2D) conjugated polymer, polymeric carbon nitride (CN) is attracting dramatically increasing interest due to its unusual properties, facile synthesis from abundant and inexpensive starting materials, and promising applications ranging from (photo)catalysis, and photoelectrochemistry, to biosensors. The polymeric feature and facile synthesis of CN allow easy engineering of its structure at the molecular level. For instance, the moderate reactivity of CN at the interface, together with the aromatic π-conjugated framework and intralayer hydrogen bonds, provides ample possibilities to control its molecular structure and properties to meet task-specific applications...
March 8, 2018: Chemical Society Reviews
Marianna Marchini, Andrea Gualandi, Luca Mengozzi, Paola Franchi, Marco Lucarini, Pier Giorgio Cozzi, Vincenzo Balzani, Paola Ceroni
A mechanism based on the sequential absorption of two photons by the components of a redox couple has been recently proposed for catalysis of the energetically demanding reduction of aryl halides. Here, we analyze the suggested photochemical mechanism of this reaction, which employs perylenediimide (PDI) as a photocatalyst, on the basis of spectroscopic, electrochemical and electron paramagnetic resonance data. Our results indicate that the photoexcited PDI radical anion (*PDI˙- ) cannot play the role of a photosensitizer in the aforementioned process...
March 8, 2018: Physical Chemistry Chemical Physics: PCCP
Meng Wang, Zhijian Peng, Jingwen Qian, Hong Li, Zengying Zhao, Xiuli Fu
The data presented in this article are related to a research article entitled 'Highly efficient solar-driven photocatalytic degradation on environmental pollutants over a novel C fibers@MoSe2 nanoplates core-shell composite' (Wang et al., 2018) [1]. In this article, we report original data on the synthesis processes optimization of the proposed composite together with its formation mechanism. The report includes the composition, microstructure and morphology of the corresponding samples, and the photocatalytic activity and stability of the optimal composite...
April 2018: Data in Brief
Mikhail F Butman, Nikolay L Ovchinnikov, Nikita S Karasev, Nataliya E Kochkina, Alexander V Agafonov, Alexandr V Vinogradov
We report on a new approach for the synthesis of TiO2 -pillared montmorillonite, where the pillars exhibit a high degree of crystallinity (nanocrystals) representing a mixture of anatase and rutile phases. The structures exhibit improved adsorption and photocatalytic activity as a result of hydrothermally activated intercalation of titanium polyhydroxo complexes (i.e., TiCl4 hydrolysis products) in a solution with a concentration close to the sol formation limit. The materials, produced at various annealing temperatures from the intercalated samples, were characterized by infrared spectroscopy, differential scanning calorimetry (DSC)/thermogravimetric analysis (TGA), X-ray diffraction, dynamic light scattering (DLS) measurements, and liquefied nitrogen adsorption/desorption...
2018: Beilstein Journal of Nanotechnology
Shankramma Kalikeri, Vidya Shetty Kodialbail
Mixed-phase bismuth ferrite (BFO) nanoparticles were prepared by co-precipitation method using potassium hydroxide as the precipitant. X-ray diffractogram (XRD) of the particles showed the formation of mixed-phase BFO nanoparticles containing BiFeO3 /Bi25 FeO40 phases with the crystallite size of 70 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the formation of quasi-spherical particles. The BFO nanoparticles were uniform sized with narrow size range and with the average hydrodynamic diameter of 76 nm...
March 6, 2018: Environmental Science and Pollution Research International
Xiang Zheng, Zhi-Peng Shen, Can Cheng, Lei Shi, Rong Cheng, Dong-Hai Yuan
The presence of pathogenic microorganisms in water is a great threat to human health, and photocatalysis is promising for disinfection. However, the research on virus inactivation with visible-light photocatalysis is still limited, especially the coexistence of virus and its host bacteria. In this study, bacteriophage f2 and its host E. coil 285 were used as the model microorganisms, and the disinfection performance of prepared Cu-TiO2 nanofibers under visible light was investigated. The result showed that the prepared Cu-TiO2 nanofibers showed a brilliant ability in terms of removing bacteriophage f2 and E...
March 3, 2018: Environmental Pollution
Jin Liu, Wei Lu, Qian Zhong, Hongzhang Wu, Yunlin Li, Lili Li, Zhenling Wang
Semiconductor photocatalysis has become the focus of recent research on antibiotic treatment because it is a green and efficient technology. In this study, α-GaOOH with several novel microstructures has been synthesized at a low temperature and its subsequent thermal transformation. The influence of pH on the synthesis of α-GaOOH is studied, and the results indicate that pH played an important role in the microstructures of α-GaOOH and β-Ga2 O3 . All Ga2 O3 samples possess macro-mesoporous network structures and exhibits a remarkable photocatalytic activity for antibiotic degradation...
February 27, 2018: Journal of Colloid and Interface Science
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