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Koichiro Saito, Ichiro Tanabe, Tetsu Tatsuma
Plasmon-induced charge separation (PICS) at the interface between a plasmonic nanoparticle and semiconductor is now widely used for photovoltaics and photocatalysis. Here we take advantage of PICS for site-selective nanoetching of silver nanocubes on TiO2 beyond the diffraction limit. A silver nanocube exhibits two resonance modes localized at the top and bottom of the nanocube (distal and proximal modes, respectively) when it is placed on TiO2. We achieved selective etching at the top and the bottom of the nanocubes by PICS based on the distal and proximal modes, respectively...
October 21, 2016: Journal of Physical Chemistry Letters
Bratindranath Mukherjee, Swagotom Sarker, Eric Crone, Pawan Pathak, Vaidyanathan Ravi Subramanian
This work presents a hitherto unreported approach to assemble a 1D oxide-1D chalcogenide heterostructured photoactive film. As a representative system, bismuth (Bi), a low melting point catalyst, facilitated 1D CdSe nanowires are directly grown on anodized 1D-TiO2 nanotube (T_NT). A combination of the reductive successive-ionic-layer-adsorption-reaction (R-SILAR) and the solution-liquid-solid (S-L-S) approach is implemented towards the assembly of this heterostructure, reported in this 1D-1D form for the first time...
October 20, 2016: ACS Applied Materials & Interfaces
Bingqing Zhang, Shengyang Wang, Wenjun Fan, Weiguang Ma, Zhenxing Liang, Jingying Shi, Shijun Liao, Can Li
The oxygen reduction reaction (ORR) is a key step in H2 -O2 fuel cells, which, however, suffers from slow kinetics even for state-of-the-art catalysts. In this work, by making use of photocatalysis, the ORR was significantly accelerated with a polymer semiconductor (polyterthiophene). The onset potential underwent a positive shift from 0.66 to 1.34 V, and the current was enhanced by a factor of 44 at 0.6 V. The improvement was further confirmed in a proof-of-concept light-driven H2 -O2 fuel cell, in which the open circuit voltage (Voc ) increased from 0...
October 20, 2016: Angewandte Chemie
Mattia Pierpaoli, Chiara Giosuè, Maria Letizia Ruello, Gabriele Fava
Nowadays, there is an amplified interest in maintaining suitable indoor air quality (IAQ). Besides a wide range of available interventions, air cleaners are considered a valuable tool, since based on inexpensive and easily implementing technologies to improve IAQ. The purpose of this work is to combine the TiO2-photocatalysis with the electrostatic and adsorption processes, in order to improve efficiency and reliability. A TiO2-photocatalytic oxidation combined with an electrostatic filter has been studied...
October 19, 2016: Environmental Science and Pollution Research International
Jincai Zhao, Wanhong Ma
HO-adduct radicals have been investigated and confirmed as the common initial intermediates in TiO2 photocatalysis and Fenton degradations of water-insoluble aromatics. However, the evolution of HO-adduct radicals to phenols has not been completely clarified. In this study, we discovered that when 4-deuterium-toluene (4-d-toluene) and p-xylene were degraded by TiO2-photocatalysis and Fenton reactions, respectively, a portion of the 4-deuterium or 4-CH3 group (18~100%) at the attacked ipso position shifted to the adjacent position of the ring in the formed phenols (NIH shift)...
October 19, 2016: Chemistry, An Asian Journal
Abdelaziz Boulesbaa, Kai Wang, Masoud Mahjouri-Samani, Mengkun Tian, Alexander A Puretzky, Ilia Ivanov, Christopher M Rouleau, Kai Xiao, Bobby G Sumpter, David B Geohegan
Photoinduced interfacial charge transfer is at the heart of many applications, including photovoltaics, photocatalysis, and photodetection. With the emergence of a new class of semiconductors such as monolayer two-dimensional transition metal dichalcogenides (2D-TMDs), charge transfer at the 2D/2D heterojunctions attracted several efforts due to the remarkable optical and electrical properties of 2D-TMDs. Unfortunately, in 2D/2D heterojunctions, for a given combination of two materials, the relative energy band alignment and the charge transfer efficiency are locked...
October 18, 2016: Journal of the American Chemical Society
Guang-Lin Zhang, Sheng Wang, Jin-Le Hou, Chong-Jiao Mo, Chen-Jie Que, Qin-Yu Zhu, Jie Dai
Although a lot of titanium oxo-clusters (TOCs) have been synthesized and characterized, research studies on their application properties are still limited. The work described here is not only aimed at the synthesis and crystal structures of the TOCs, but also aimed at exploration of their potential applications in molecule based fluorescence labelling and photocatalysis. Three heterometallic TOC compounds with lanthanide (Ln) elements Sm(iii) (1), Eu(iii) (2) and Gd(iii) (3) are prepared and their cluster structures are characterized as LnTi11 cages...
October 18, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Nicoleta Petrea, Răzvan Petre, Gabriel Epure, Vasile Şomoghi, Liviu C Tănase, Cristian M Teodorescu, Ştefan Neaţu
We report the applicability of a hybrid system comprising a La(3+)-based catalyst and an Au/TiO2 photocatalyst in the decomposition of chemical weapons. This system is able to perform complete degradation of soman, sarin and VX in less than 1 minute under low basic conditions and visible light irradiation.
October 18, 2016: Chemical Communications: Chem Comm
Young Kwang Kim, Eun Bi Kang, Sung Han Kim, Shazid Md Sharker, Beyung Youn Kong, Insik In, Kang Dae Lee, Sung Young Park
In this study, a new hydrophilic-hydrophobic transition surface was designed via visible-light-induced photocatalytic perfluorinated silica-based fluorescent carbon nanoparticles (FNPs)/TiO2. Perfluorinated silica-polydopamine hybrid FNPs (f-FNPs) were easily fabricated by carbonization in an emulsion system consisting of tetraethyl orthosilicate and dopamine, followed by the deposition of TiO2 on f-FNPs, which demonstrated the reversal from hydrophobic to hydrophilic nature during successful photocatalysis...
October 17, 2016: ACS Applied Materials & Interfaces
Shuai-Ru Zhu, Peng-Fei Liu, Meng-Ke Wu, Wen-Na Zhao, Guo-Chang Li, Kai Tao, Fei-Yan Yi, Lei Han
Metal-organic frameworks (MOFs) are considered as suitable materials for various applications in the area of photocatalysis. On the other hand, 2D BiOBr materials are efficient for the photodegradation of organic dyes under visible light illumination. In this work, BiOBr/NH2-MIL-125(Ti) composite photocatalysts with different NH2-MIL-125(Ti) content were prepared by incorporating NH2-MIL-125(Ti) with BiOBr using a co-precipitation method. A series of characterizations confirmed the strong synergistic effect between BiOBr and NH2-MIL-125(Ti)...
October 17, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Shouwei Zhang, Huihui Gao, Xia Liu, Yong-Shun Huang, Xijin Xu, Njud S Alharbi, Tasawar Hayat, Jia-Xing Li
The smaller particle sizes, better dispersion and more heterojunction interfaces can enhance the photocatalytic performance of photocatalysts. Herein, ultradispersed amorphous silver silicates/ultrathin g-C3N4 nanosheets heterojunction composites (a-AgSiO/CNNS) with intimate interfacial coupling effect were synthesized through the facile in situ precipitation of ultrafine a-AgSiO (~5.2 nm) uniformly dispersed on the entire surface of hierarchical ultrathin CNNS. In this process, the ultrathin CNNS not only perform as the support to form heterostructures, but are employed as dispersant to confine the aggregation of a-AgSiO nanoparticles...
October 14, 2016: ACS Applied Materials & Interfaces
Haipeng Chu, Xinjuan Liu, Baibai Liu, Guang Zhu, Wenyan Lei, Huigang Du, Junying Liu, Jianwei Li, Can Li, Changqing Sun
To make full use of the solar energy, exploring broad spectrum active photocatalysts has become one of the core issues for photocatalysis. Here we report a novel hexagonal 2H-MoSe2 photocatalyst with ultraviolet (UV)-visible-near infrared (NIR) light response for the first time. The results indicate that the MoSe2 displays excellent photo-absorption and photocatalytic activity in the reduction of Cr(VI) under UV and visible even NIR light irradiation. MoSe2 synthesized at pH value of 2 achieves the highest Cr(VI) reduction rates of 99%, 91% and 100% under UV, visible and NIR light irradiation, respectively, which should be attributed to its comparatively higher light absorption, efficient charge separation and transfer as well as relatively large number of surface active sites...
October 13, 2016: Scientific Reports
Liwei Wang, Jintao Li, Yinghui Wang, Kefu Yu, Xingying Tang, Yuanyuan Zhang, Shaopeng Wang, Chaoshuai Wei
One-dimensional (1D) SnO2-coated ZnO nanowire (SnO2/ZnO NW) N-N heterojunctions were successfully constructed by an effective solvothermal treatment followed with calcination at 400 °C. The obtained samples were characterized by means of XRD, SEM, TEM, Scanning TEM coupled with EDS and XPS analysis, which confirmed that the outer layers of N-type SnO2 nanoparticles (avg. 4 nm) were uniformly distributed onto our pre-synthesized n-type ZnO nanowire supports (diameter 80~100 nm, length 12~16 μm). Comparisons of the gas sensing performances among pure SnO2, pure ZnO NW and the as-fabricated SnO2/ZnO NW heterojunctions revealed that after modification, SnO2/ZnO NW based sensor exhibited remarkably improved response, fast response and recovery speeds, good selectivity and excellent reproducibility to n-butylamine gas, indicating it can be used as promising candidates for high-performance organic amine sensors...
October 13, 2016: Scientific Reports
Minggui Wang, Jie Han, Yimin Hu, Rong Guo, Yadong Yin
Carbon-incorporated mesoporous NiO/TiO2 (NiO/TiO2/C) hybrid shells as low-cost and highly efficient visible light photocatalysts have been developed. The NiO/TiO2/C hybrid shells were synthesized by choosing polystyrene nanospheres as templates, followed by TiO2 and NiO coating, and finally the calcination post-treatment to carbonize PS with the aid of metal oxides. Polystyrene nanospheres serve dual purposes as both a template to ensure the hollow structure and the electrically conductive graphite carbon source...
October 12, 2016: ACS Applied Materials & Interfaces
Kalpesh Sorathiya, Biswajit Mishra, Abhishek Kalarikkal, Kasala Prabhakar Reddy, Chinnakonda S Gopinath, Deepa Khushalani
Recyclability is an important aspect for heterogeneous photo-catalysts. Ease of recovery and stability of the photo-catalyst in terms of efficiency over the number of cycles are highly desired and in fact it is ideal if the efficiency is constant and it should not decrease marginally with each cycle. Presented here is a seminal observation in which the photocatalytic activity is shown to improve with increasing number of catalytic cycles (it is 1.7 times better after the 1(st) cycle and 3.1 times better after the 2(nd) cycle)...
October 12, 2016: Scientific Reports
Norman Lu, Yun-Peng Yeh, Guan-Bo Wang, Tsung-Yao Feng, Yang-Hsin Shih, Dong Chen
Visible light-induced photocatalysis is potentially advantageous and could be an efficient approach to degrade contaminants because it can be used to selectively target specific wavelength for decomposition of organic contaminants in water and wastewater. This study demonstrates the photodegradation of sulfamethoxazole (SMX) using [Pt(3,3'-dicarboxy-2,2'-bpy)(1,2-benzenedithiolate)] (Complex 1)-sensitized and [Pt(4,4'-dicarboxy-2,2'-bpy)(1,2-benzenedithiolate)] (Complex 2)-sensitized titanium dioxide (TiO2) under blue or yellow light (420 or 580 nm, respectively) irradiation in water...
October 12, 2016: Environmental Science and Pollution Research International
Yi Li, Chi Zhang, Danmeng Shuai, Saraschandra Naraginti, Dawei Wang, Wenlong Zhang
The challenge to achieve effective water disinfection of pathogens, especially viruses, with minimized harmful disinfection byproducts calls for a cost-effective and environmentally benign technology. Here, polymeric graphitic carbon nitride (g-C3N4), as a metal-free robust photocatalyst, was explored for the first time for its ability to inactivate viruses under visible light irradiation. MS2 with an initial concentration of 1 × 10(8) PFU/mL was completely inactivated by g-C3N4 with a loading of 150 mg/L under visible light irradiation of 360 min...
October 5, 2016: Water Research
M Jahurul Islam, D Amaranatha Reddy, Noh Soo Han, Jiha Choi, Jae Kyu Song, Tae Kyu Kim
An oxygen-vacancy rich, bismuth oxyiodide-based Z-scheme 3D hierarchical MoS2/BiOI/AgI ternary nanocomposite photocatalyst was fabricated using a simple precipitation process in ethylene glycol and water. The presence of oxygen-vacancies in BiOI and the two-dimensional nature of molybdenum disulfides in the composite prolongs the charge carrier lifetime through a Z-scheme system and enhances the performance of the photocatalyst for the degradation of rhodamine B. On the basis of efficient separation of photoexcited electron-hole pairs, a mechanism is proposed whereby MoS2 and oxygen vacancy states increase charge carrier lifetimes and improve the photocatalytic activity...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
Xiaofang Li, Changqian Wang, Bo Li, Yu Shao, Danzhen Li
Efficient light harvesting was observed over CdS photodeposited on In2O3 photonic crystals during the photocatalytic hydrogenation of 4-nitroaniline to p-phenylenediamine. The highest conversion of 4-nitroaniline and selectivity of p-phenylenediamine over the In2O3 photonic crystal supported CdS were ∼93% and ∼99%, respectively, which were better than that achieved for commercial hexagonal CdS. The existence of the photonic crystal structure was responsible for the higher efficiency of In2O3 photonic crystal supported CdS...
October 12, 2016: Physical Chemistry Chemical Physics: PCCP
Sulagna Patnaik, Satyabadi Martha, Giridhar Madras, Kulamani Parida
In continuation of our earlier work on Au-g-C3N4 and to improve its activity further, Au incorporated sulfated carbon nitride (g-C3N4) has been designed by using a simple impregnation cum borohydrate reduction method for the visible light induced water reduction reaction for hydrogen generation. The photocatalysts were characterized using various instrumental methods such as PXRD, UV-Vis DRS, SEM, HR-TEM, XPS, PL and TRPL spectral analysis. Functionalisation by the -HSO3 group and incorporation of AuNPs in the g-C3N4 skeleton lead to the extension of its pi-conjugated system, modification of its semiconductor properties, such as band structure engineering with a tunable bandgap, red-shift of the optical absorption band and promotion of charge migration and separation...
October 5, 2016: Physical Chemistry Chemical Physics: PCCP
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