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Yu Liu, Honglei Cai, Fangfang Wang, Jianlin Wang, Qiuping Huang, Zhengping Fu, Yalin Lu
A structure composed of a nanosheet array may trap photons, which could be used to enhance the optical response via resonances; this may be highly useful in ultraviolet (UV) detection, photocatalysis, solar cells, etc. Moreover, anatase nanosheets exposed with the active {001}, {111}, and {116} facets are promising in applications such as Li-ion battery, photocatalysis, and electrochemistry. Therefore, in this study, the {116} faceted single-crystalline anatase nanosheet array with the sheet spacing in the range of several hundred nanometers was directly grown on the transparent conductive substrates...
January 17, 2018: Nanoscale
Marieke Poß, Henriette Gröger, Claus Feldmann
The inorganic-organic hybrid nanoparticles Gd43+[AlPCS4]34- and La43+[TPPS4]34- ([AlPCS4]4-: aluminium(iii) chlorido phthalocyanine tetrasulfonate; [TPPS4]4-: tetraphenylporphine sulfonate) are shown for the first time. Both were obtained via aqueous synthesis and contain extremely high contents of [AlPCS4]34- (81 wt%) and [TPPS4]34- (83 wt%). They show efficient singlet oxygen (1O2) production upon daylight and red-light irradiation. Photocatalysis is evidenced via dye degradation as a proof-of-the-concept and proceeds with daylight and even red-light illumination...
January 17, 2018: Chemical Communications: Chem Comm
Si Li, Jiangyong Hu
The role of natural organic matter (NOM) in contaminants removal by photolysis and photocatalysis has aroused increasing interest. However, evaluation of the influence of NOM characteristics on the transformation products (TPs) formation and transformation pathways of contaminants has rarely been performed. This study investigated the decomposition kinetics, mineralization, TPs formation and transformation pathways of antibiotic ciprofloxacin (CIP) during photolysis and photocatalysis in the presence of three commercial NOM isolates (Sigma-Aldrich humic acid (SAHA), Suwannee River humic acid (SRHA) and Suwannee River NOM (SRNOM)) by using UVA light emitting diode (UVA/LED) as an alternative light source...
January 9, 2018: Water Research
Robin E Rodríguez, Sneha P Agarwal, Shun An, Eric Kazyak, Debashree Das, Wen Shang, Rachael Skye, Tao Deng, Neil P Dasgupta
Morpho sulkowskyi butterfly wings contain naturally occurring hierarchical nanostructures that produce structural coloration. The high aspect ratio and surface area of these wings make them attractive nanostructured templates for applications in solar energy and photocatalysis. However, biomimetic approaches to replicate their complex structural features and integrate functional materials into their three-dimensional framework are highly limited in precision and scalability. Herein, a biotemplating approach is presented that precisely replicates Morpho nanostructures by depositing nanocrystalline ZnO coatings onto wings via low-temperature atomic layer deposition (ALD)...
January 16, 2018: ACS Applied Materials & Interfaces
Xianjun Lang, Jincai Zhao
Visible light has risen to be a very important facilitator for selective radical reactions enabled by well-cognized photocatalysts. The renaissance of visible light photocatalysis on this matter partly relies on integrating it with other area of catalysis. In parallel, TEMPO, a quintessential persistent radical, has a wide range of uses due to its exceptional redox behavior, giving rise to its latest prominence in catalysis. Therefore, integrating the catalysis of TEMPO with photocatalysis to carry out visible light-induced selective reactions becomes very convenient marriage of merits...
January 16, 2018: Chemistry, An Asian Journal
Yan Wu, Hou Wang, Wenguang Tu, Yue Liu, Yong Zen Tan, Xingzhong Yuan, Jia Wei Chew
Materials of perovskite-type structure have attracted considerable attention for their applications in photocatalysis. In this study, a novel composite of p-type LaFeO3 microsphere coated with n-type nanosized graphitic carbon nitride nanosheets was constructed by the quasi-polymeric calcination method with the aid of electrostatic self-assembly interaction. Results indicate that the LaFeO3/g-C3N4p-n heterostructured photocatalyst obtained, in contrast to the pure constituents, enabled improved visible-light absorption, and more efficient separation and migration of charge carriers via solid p-n heterojunction interfacial effect...
January 11, 2018: Journal of Hazardous Materials
Jijian Xu, Dong Wang, Heliang Yao, Kejun Bu, Jie Pan, Jianqiao He, Fangfang Xu, Zhanglian Hong, Xiaobo Chen, Fuqiang Huang
Nano TiO2 is investigated intensely due to extraordinary photoelectric performances in photocatalysis, new-type solar cells, etc., but only very few synthesis and physical properties have been reported on nanostructured TiO or other low valent titanium-containing oxides. Here, a core-shell nanoparticle made of TiO core covered with a ≈5 nm shell of amorphous TiO1+x is newly constructed via a controllable reduction method to synthesize nano TiO core and subsequent soft oxidation to form the shell (TiO1+x )...
January 15, 2018: Advanced Materials
Minoru Waki, Ken-Ichi Yamanaka, Soichi Shirai, Yoshifumi Maegawa, Yasutomo Goto, Yuri Yamada, Shinji Inagaki
This paper describes the physicochemical properties of a rhenium (Re) complex [Re(bpy)(CO)3Cl] immobilized on a bipyridine-periodic mesoporous organosilica (BPy-PMO) acting as a solid support. The immobilized Re complex generated a metal-to-ligand charge transfer absorption band at 400 nm. This wavelength is longer than that exhibited by Re(bpy)(CO)3Cl in the polar solvent acetonitrile (371 nm) and is almost equal to that in nonpolar toluene (403 nm). The photocatalytic activity of this heterogeneous Re complex was lower than that of a homogeneous Re complex due to the reduced phosphorescence lifetime resulting from immobilization...
January 14, 2018: Chemistry: a European Journal
Fan Lin, Jiabai Cai, Yuehai Li, Huiwu Yu, Shunxing Li
Using ammonium molybdate and thiourea as precursors, nitrogen-doped MoO3 was produced by a one-step carbonization and then fixed into the cellulose filter paper (NMCP) with acrylic resin as a fixative. NMCP was designed as a multifunctional nanocomposite, i.e., solid phase adsorbent for Fe(III) preconcentration, photocatalyst for iron species transformation and color interference removal, and colorimetric sensor for Fe(III) determination. After photocatalysis, the complex of Fe-humic substances could be transformed into Fe(III) ions, the interference of colored organic matter (e...
April 1, 2018: Talanta
Klaiani B Fontana, Giane G Lenzi, Eriton C R Seára, Eduardo S Chaves
The oxidation of As(III) to As(V) in aqueous solution was evaluated using heterogeneous photocatalysis and photolysis. The influence of TiO2 as catalyst in different crystalline (rutile, anatase) and commercial forms was evaluated in a batch reactor and an insignificant difference was observed between them. The process by photocatalysis reached up to 97% As(III) oxidation and no significant difference was observed comparing to results obtained by photolysis. The photolysis experiments (UV radiation only), also carried out in a batch system, showed a high oxidation rate of As(III) (90% in 20min)...
January 11, 2018: Ecotoxicology and Environmental Safety
Galina Matafonova, Valeriy Batoev
Over the last decade, ultraviolet light-emitting diodes (UV LEDs) have attracted considerable attention as alternative mercury-free UV sources for water treatment purposes. This review is a comprehensive analysis of data reported in recent years (mostly, post 2014) on the application of UV LED-induced advanced oxidation processes (AOPs) to degrade organic pollutants, primarily dyes, phenols, pharmaceuticals, insecticides, estrogens and cyanotoxins, in aqueous media. Heterogeneous TiO2-based photocatalysis in lab grade water using UVA LEDs is the most frequently applied method for treating organic contaminants...
January 4, 2018: Water Research
Zia Ur Rahman, Ning Wei, Yange Feng, Xiaolong Zhang, Daoai Wang
A facile method was used to prepare hollow mesoporous TiO2 and Au@TiO2 spheres using polystyrene (PS) templates. Au nanoparticles (NPs) were simultaneously synthesized and attached on the surface of PS spheres by reducing AuCl4- ions using sodium citrate which resulted in the uniform deposition of Au NPs. The outer coating of titania via sol-gel produced PS@Au@TiO2 core-shell spheres. Removing the templates from these core-shell spheres through calcination produced hollow mesoporous and crystalline Au@TiO2 spheres with Au NPs inside the TiO2 shell in a single step...
January 12, 2018: Chemistry, An Asian Journal
Yan Lv, Lin Yue, Qian Li, Baoyi Shao, Sen Zhao, Haitao Wang, Shijia Wu, Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol-gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB)...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Kazuki Kawaai, Tomoaki Yamaguchi, Eiji Yamaguchi, Satoshi Endo, Norihiro Tada, Akira Ikari, Akichika Itoh
A novel photocatalysis to construct the 3-acyl-4-arylcoumarin framework from simple aldehyde with ynoate is described. The reac-tion proceeded through an acyl radical intermediate generated by hydrogen atom abstraction from aldehyde followed by reaction with ynoate and then cyclization to afford coumarins. This valuable radical cyclization reaction gave over 20 coumarin derivatives in moderate to good yields with inexpensive 2-tBu-anthraquinone as a catalyst. In addition, synthetic coumarins were investigated for 5α-dihydrotestosterone (DHT)-induced secretion of prostate-specific antigen (PSA) levels and cell proliferation of androgen-dependent CWR22Rv1 cells...
January 12, 2018: Journal of Organic Chemistry
Yangbin Shen, Yulu Zhan, Shuping Li, Fandi Ning, Ying Du, Yunjie Huang, Ting He, Xiaochun Zhou
As an excellent hydrogen storage medium, methanol has many advantages, such as high hydrogen content (12.6 wt%), low-cost and availability from biomass or photocatalysis. However, conventional methanol-water reforming usually proceeds at high temperature. In this research, we successfully designed a new effective strategy to generate hydrogen from methanol at near-room temperature. The strategy involves two main procedures, which are CH3OH→HCOOH→H2 and NADH→HCOOH→H2. The first procedure (CH3OH→HCOOH→H2) is performed by alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH) and the Ir-catalyst...
January 11, 2018: ChemSusChem
Kenji Shirai, Gianluca Fazio, Toshiki Sugimoto, Daniele Selli, Lorenzo Ferraro, Kazuya Watanabe, Mitsutaka Haruta, Bunsho Ohtani, Hiroki Kurata, Cristiana Di Valentin, Yoshiyasu Matsumoto
Heterogeneous photocatalysis is vital in solving energy and environmental issues that this society is confronted with. Although photocatalysts are often operated in the presence of water, it has not been yet clarified how the interaction with water itself affects charge dynamics in photocatalysts. Using water-coverage controlled steady and transient infrared absorption spectroscopy and large-model (∼800 atoms) ab-initio calculations, we clarify that water enhances hole trapping at the surface of TiO2 anospheres but not of well-faceted nanoparticles...
January 12, 2018: Journal of the American Chemical Society
Huajun Feng, Chenyi Tang, Qing Wang, Yuxiang Liang, Dongsheng Shen, Kun Guo, Qiaoqiao He, Thilini Jayaprada, Yuyang Zhou, Ting Chen, Xianbin Ying, Meizhen Wang
This study reports a high-performance 3D stainless-steel photoanode (3D SS photoanode) for bioelectrochemical systems (BESs). The 3D SS photoanode consists of 3D carbon-coated SS felt bioactive side and a flat α-Fe2O3-coated SS plate photoactive side. Without light illumination, the electrode reached a current density of 26.2 ± 1.9 A m-2, which was already one of the highest current densities reported thus far. Under illumination, the current density of the electrode was further increased to 46.5 ± 2...
December 28, 2017: Chemosphere
Bruce E Rittmann
Having worked with biofilms since the 1970s, I know that they are ubiquitous in nature, of great value in water technology, and scientifically fascinating. Biofilms are naturally able to remove BOD, transform N, generate methane, and biodegrade micropollutants. What I also discovered is that biofilms can do a lot more for us in terms of providing environmental services if we give them a bit of help. Here, I explore how we can use active substrata to enable our biofilm partners to provide particularly challenging environmental services...
December 28, 2017: Water Research
Maria Bouri, Ulrich Aschauer
Oxynitrides with the perovskite structure are promising candidates for photocatalysis under visible light due to their appropriate optical and electronic properties. Recently, layered perovskites have attracted attention for their improved performance with respect to bulk perovskites in photocatalytic water splitting. In this paper, we investigate the structural and electronic properties of the layered Ruddlesden-Popper oxynitride Sr2TaO3N and its (001) and (100) surfaces using density functional theory (DFT) calculations...
January 11, 2018: Physical Chemistry Chemical Physics: PCCP
Maciej Gawlik, Jakub Trawiński, Robert Skibiński
The imitation of phase I metabolism of moclobemide and toloxatone, two monoamine oxidase type A (MAO-A) inhibitors, was performed with the use of titanium dioxide photocatalytic process. Ultra high pressure liquid chromatography system coupled with an accurate hybrid ESI-Q-TOF mass spectrometer was used for the evaluation of metabolic profiles, structural elucidation of the identified transformation products and quantitative analysis of the process. Based on high resolution MS and MS/MS data, eleven transformation products were characterized in photocatalytic experiments for moclobemide and seven products for toloxatone...
January 8, 2018: European Journal of Pharmaceutical Sciences
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