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You-Quan Zou, Fabian M Hörmann, Thorsten Bach
Although enantioselective catalysis under thermal conditions has been well established over the last few decades, the enantioselective catalysis of photochemical reactions is still a challenging task resulting from the complex enantiotopic face differentiation in the photoexcited state. Recently, remarkable achievements have been reported by a synergistic combination of organocatalysis and photocatalysis, which have led to the expedient construction of a diverse range of enantioenriched molecules which are generally not easily accessible under thermal conditions...
November 20, 2017: Chemical Society Reviews
I Michael-Kordatou, P Karaolia, D Fatta-Kassinos
An upsurge in the study of antibiotic resistance in the environment has been observed in the last decade. Nowadays, it is becoming increasingly clear that urban wastewater is a key source of antibiotic resistance determinants, i.e. antibiotic-resistant bacteria and antibiotic resistance genes (ARB&ARGs). Urban wastewater reuse has arisen as an important component of water resources management in the European Union and worldwide to address prolonged water scarcity issues. Especially, biological wastewater treatment processes (i...
October 27, 2017: Water Research
Daria Kądziołka, Paulina Rokicka, Agata Markowska-Szczupak, Antoni W Morawski
BACKGROUND: In public and residential buildings, fungi are usually found in the dust or growing on building materials medium such. It has been known that a number of their spores may contaminate the indoor environment and deteriorate air quality in accommodation spaces. Previously designed air cleaning systems do not guarantee a complete removal of agents harmful to humans and animals. Therefore, there is a great need to develop a new solution to remove molds from indoor air. In recent years, photocatalysis based on titanium dioxide (TiO<sub>2</sub>) has been proposed as an effective method for air pollutants removal...
November 17, 2017: Medycyna Pracy
Mariana Cecilio de Oliveira Monteiro, Patrik Schmuki, Manuela Sonja Killian
The effect of different post-treatments on TiO2 anatase surface reactivity was investigated, in order to obtain the best techniques for enhancing anatase performance in diverse applications, e.g. in photocatalysis and especially as photoelectrodes for dye-sensitized solar cells (DSSCs). Different post-treatments of compact anodic anatase TiO2 were compared, including O2 plasma, UV irradiation, immersion in H2O2, vapor thermal treatment and post-anodization, evaluating the increase of the amount of OH reactive groups on the surface and removal of surface contamination...
November 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Weijia Li, Zhaoyong Lin, Guowei Yang
Semiconductor photocatalysis for hydrogen production is a promising route to address current energy demands. It is still a great challenge to spatially separate photogenerated electrons and holes in bulk photocatalysts because of the long carrier transport pathway from the bulk to the surface. 2D heterostructured photocatalysts with the type II band alignment can not only shorten the carrier transport pathway, but also create an electric field at the interface to suppress the carrier recombination. However, ultrathin and intimate-contact 2D heterostructured photocatalysts have rarely been achieved so far...
November 15, 2017: Nanoscale
Gwi-Rim Park, Jisu Moon, Eun Jin Cho
(Hetero)aryloxytetrafluoroethylation of heteroaromatics and alkenes has been achieved by visible-light photocatalysis utilizing readily synthesized oxyfluoroalkyl reagents. The mild reaction conditions and the high diversity on both substrates and oxyfluoroalkyl reagents make this a useful method for late-stage modifications in the development of various functional molecules.
November 15, 2017: Chemical Communications: Chem Comm
Xiaoliang Wang, Mashkoor Ahmad, Hongyu Sun
Zinc oxide (ZnO) nanostructures have been studied extensively in the past 20 years due to their novel electronic, photonic, mechanical and electrochemical properties. Recently, more attention has been paid to assemble nanoscale building blocks into three-dimensional (3D) complex hierarchical structures, which not only inherit the excellent properties of the single building blocks but also provide potential applications in the bottom-up fabrication of functional devices. This review article focuses on 3D ZnO hierarchical nanostructures, and summarizes major advances in the solution phase synthesis, applications in environment, and electrical/electrochemical devices...
November 13, 2017: Materials
Yanbing Wang, Bin Shang, Miao Liu, Feng Shi, Bo Peng, Ziwei Deng
Engineering hollow particles with high complexity in their morphology or composition is highly desirable for both fundamental studies and practical applications. Here, we combine mussel-inspired polydopamine (PDA) chemistry with template-assisted and hydrothermal approaches to explore a general approach for engineering hollow PDA colloidal composite particles with tunable complexities in terms of particle geometry, shell architecture and chemical composition. PDA coating and hydrothermal treatment are carried out sequentially in the same environment, which not only simplifies the experimental procedure but also avoids the use of hazardous core-removers...
October 27, 2017: Journal of Colloid and Interface Science
Ali Fakhri, Mona Azad, Leila Fatolahi, Shiva Tahami
Water pollution caused by different pollutants is one of the challenging tasks for the scientific community. We have prepared and characterized a material for removal of pollutant compounds. ZnO quantum dots decorated CuO nanosheets and TiO2 quantum dots decorated WO3 nanosheets composites have been prepared using a hydrothermal method. The as synthesized catalysts were characterized by various techniques. The crystallite sizes of CuO NSs and WO3 NSs were to be obtained 12.5 and 13.25nm and when dopped with ZnO and TiO2 size reduces to 3...
November 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
Marta Stucchi, Federico Galli, Claudia L Bianchi, Carlo Pirola, Daria C Boffito, Franco Biasioli, Valentino Capucci
Volatile and semi volatile organic compounds' concentration have dramatically increased in indoor environments in recent years. UV light promotes titanium dioxide, which oxidises various molecules; however, most of the studies report the degradation of a single VOC. Here, we investigate the photo-oxidation of 17 molecules in mixture to have a realistic test of TiO2 efficacy. We compare P25, a nanometric catalyst, and 1077, a micrometric sample, that poses less health concerns. A proton-transfer-reaction mass spectrometer measured online the concentration of all the pollutants simultaneously...
November 5, 2017: Chemosphere
Longqing Mi, Yongyi Feng, Lei Cao, Mingqiang Xue, Yanlin Huang, Lin Qin, Hyo Jin Seo
Silver-containing lanthanum metaniobate Ag0.5La0.5Nb2O6 nanoparticles were synthesized by sol-gel polymerized complex method. A typical defect-perovskite structure was confirmed by XRD Rietveld refinements. The surface characteristics of the sample were tested by SEM, TEM and EDS measurements. SEM and TEM show that the sample presents ball-like particles with the diameters of 100nm to 400nm. The sample shows both self-activated luminescence and photocatalytic activities. Ag0.5La0.5Nb2O6 has a direct transition with band energy of 2...
November 3, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Wei-Ning Du, Shyi-Tien Chen
Three commonly used dyes, Acid Red-114 (AR-114), Reactive Black-5 (RB-5), and Disperse Black EX-SF (DB-EX-SF), were treated in a pH-neutral liquid with ultraviolet (UV) light by two reactive methods: photocatalysis with titanium dioxide (TiO2), and/or chemocatalysis with hydrogen peroxide (H2O2) as the oxidant and various ferrous-based electron mediators as catalysts. Important factors for dye oxidation were determined through bifactorial experiments. The optimum combinations and doses of the three key reagents, namely TiO2, H2O2, and EDTA-Fe, were also determined...
November 8, 2017: Journal of Environmental Management
Xiao Tang, Wanyi Chu, Jueshi Qian, Jingcheng Lin, Guozhong Cao
TiO2 nanosheets have continuously been intriguing due to their high surface activities as photocatalyst but still challenging to synthesis large-scale 2D nanostructures. A special microstructure evolution of TiO2 , ripening in aqueous solution at low temperature (≈4 °C), is found for the first time, i.e., from the initial aperiodic atom-networks gradually into low crystallized continuous spongy structure with small crystal facets and ultimately forming large-size anatase nanosheets with exposed (101) and (200) facets...
November 10, 2017: Small
Mengting Yu, Shixiong Zhou, Qingguo Meng, Haiqin Lv, Zhihong Chen, Yongguang Zhang, Mingliang Jin, Mingzhe Yuan, Xin Wang, Guofu Zhou
In recent years, BiVO4 has drawn much attention as a novel photocatalyst given its excellent ability to absorb visible light. This work reports the development of Ag-modified BiV1-xMoxO4 composites through a facile hydrothermal synthesis with the subsequent photoinduced reduction of Ag(+) at almost neutral pH conditions. Metallic Ag nanoparticles were deposited on the (040) facet of Mo-doped BiVO4 powders. The crystal structure and morphology of the as-prepared samples were studied by XRD and SEM analyses. Moreover, the photocatalytic performance of BiVO4, Ag/BiVO4, and Ag-modified BiV1-xMoxO4 were evaluated by the degradation of rhodamine B (RhB)...
November 9, 2017: Nanoscale Research Letters
Lasantha Korala, Jason R Germain, Erica Chen, Irina R Pala, Da Li, Stephanie L Brock
Synthesis of efficient photocatalysts based on CdS nanomaterials for oxidative decomposition of organic effluents typically focuses on (a) enhancement of surface area of the catalysts and (b) promotion of the separation of photogenerated electron-hole pairs. CdS aerogel, which are synthesized by simple sol-gel assembly of discrete nanocrystals (NCs) into a porous network followed by supercritical drying, could provide higher surface area for photocatalytic reactions along with facile charge separation due to direct contact between NCs via covalent bonding...
2017: Inorganic Chemistry Frontiers
Sanja J Armaković, Stevan Armaković, Dragana D Četojević-Simin, Filip Šibul, Biljana F Abramović
In this work we have investigated in details the process of degradation of the 4-amino-6-chlorobenzene-1,3-disulfonamide (ABSA), stable hydrolysis product of frequently used pharmaceutical hydrochlorothiazide (HCTZ), as one of the most ubiquitous contaminants in the sewage water. The study encompassed investigation of degradation by hydrolysis, photolysis, and photocatalysis employing commercially available TiO2 Degussa P25 catalyst. The process of direct photolysis and photocatalytic degradation were investigated under different type of lights...
November 6, 2017: Environmental Pollution
Xiaoliang Wang, Yanyan Zhao, Kristian Mølhave, Hongyu Sun
Titanium dioxide (TiO₂) materials have been intensively studied in the past years because of many varied applications. This mini review article focuses on TiO₂ micro and nano architectures with the prevalent crystal structures (anatase, rutile, brookite, and TiO₂(B)), and summarizes the major advances in the surface and interface engineering and applications in environmental and electrochemical applications. We analyze the advantages of surface/interface engineered TiO₂ micro and nano structures, and present the principles and growth mechanisms of TiO₂ nanostructures via different strategies, with an emphasis on rational control of the surface and interface structures...
November 9, 2017: Nanomaterials
Minki Baek, Eun-Ju Kim, Seok Won Hong, Wooyul Kim, Kijung Yong
Due to its high light absorption coefficient and appropriate bandgap, CuInS2 (CIS) has been receiving much attention as an absorber material for thin film solar cells and also as a visible light photocatalyst. Herein we present heterostructured CIS/ZnO nanorods (NRs) in an attempt to enhance light absorption and facilitate charge separation/transfer in the photocatalysis system. CIS nanoparticles (NPs) were directly deposited on ZnO nanorod arrays (NRAs) to fabricate heterostructured CIS/ZnO NRAs using an environmentally benign, non-hydrazine solution reaction...
November 8, 2017: Photochemical & Photobiological Sciences
Zhenyu Huang, Xiaoqiao Zeng, Kai Li, Shanmin Gao, Qingyao Wang, Jun Lu
Direct Z-scheme NiTiO3/g-C3N4 heterojunctions were successfully assembled by using simple calcination method and the photoelectrochemical and photocatalytic performance were investigated by light emitting diode (LED). The photoanode composed by the heterojunction with about 50 wt % NiTiO3 content exhibits the best photoelectrochemical activity with photoconversion efficiency up to 0.066%, which is 4.4 and 3.13 times larger than NiTiO3 or g-C3N4. The remarkably enhanced photoelectrochemical and photocatalytic activity of the heterojunction can be due to the efficiently photogenerated electron-hole separation by a Z-scheme mechanism...
November 14, 2017: ACS Applied Materials & Interfaces
Deli Jiang, Wanxia Ma, Peng Xiao, Leqiang Shao, Di Li, Min Chen
All-solid-state Z-scheme heterojunction has attracted much attention in photocatalytic field because of its strong ability in charge separation and transfer. In the present study, all-solid-state ternary Z-scheme heterojunction constructed by graphitic carbon nitride (CN) nanosheet, carbon nanotube (CNT), and Bi2WO6 (BWO) nanosheet, in which CNT was employed as the electron mediator. The CN/CNT/BWO ternary Z-scheme heterojunction shows the enhanced photocatalytic activity towards the degradation of tetracycline hydrochloride (TC) as compared to the pristine g-C3N4, Bi2WO6, CNT/BWO, CNT/CN, and CN/BWO...
October 20, 2017: Journal of Colloid and Interface Science
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