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Ying Zhou, Wei Li, Qian Zhang, Shuai Yan, Yuehan Cao, Fan Dong, Fang Wang
Recently, non-noble metals with plasmonic properties have attracted great attention due to their potential applications in photocatalytic solar-energy conversion. However, in contrast to the well-studied plasmonic noble metals (mainly Au and Ag), which have distinct absorption peaks, the understanding of light absorption and the photocatalytic reaction mechanism of non-noble metals is far less. In this study, semimetal bismuth films are deposited on fluorine-doped tin oxide substrates by a dc magnetron sputtering method...
September 14, 2017: Physical Chemistry Chemical Physics: PCCP
Jang Ho Joo, Byung-Ho Kim, Jae-Seung Lee
A novel room-temperature aqueous synthesis for gold nanoparticle-embedded silver cubic mesh nanostructures using AgCl templates via a template-assisted coreduction method is developed. The cubic AgCl templates are coreduced in the presence of AuCl4(-) and Ag(+) , resulting in the reduction of AuCl4(-) into gold nanoparticles on the outer region of AgCl templates, followed by the reduction of AgCl and Ag(+) into silver cubic mesh nanostructures. Removal of the template clearly demonstrates the delicately designed silver mesh nanostructures embedded with gold nanoparticles...
September 13, 2017: Small
Joseph F S Fernando, Chao Zhang, Konstantin L Firestein, Dmitri Golberg
In situ transmission electron microscopy (TEM) allows one to investigate nanostructures at high spatial resolution in response to external stimuli, such as heat, electrical current, mechanical force and light. This review exclusively focuses on the optical, optoelectronic and photocatalytic studies inside TEM. With the development of TEMs and specialized TEM holders that include in situ illumination and light collection optics, it is possible to perform optical spectroscopies and diverse optoelectronic experiments inside TEM with simultaneous high resolution imaging of nanostructures...
September 13, 2017: Small
Yuanzhi Hong, Changsheng Li, Di Li, Zhenyuan Fang, Bifu Luo, Xu Yan, Hongqiang Shen, Baodong Mao, Weidong Shi
Graphitic carbon nitride (GCN) nanosheets with unique physicochemical properties have received increasing attention in the area of photocatalysis, yet tunable thickness for the straightforward production of this graphite-like two-dimensional (2D) nanomaterial remains a challenge. In this work, GCN nanosheets with different thicknesses were firstly prepared by a direct calcination of melamine supramolecular aggregates (MSA) obtained from a hydrochloric acid (HCl)-induced hydrothermal assembly approach. The resultant nanosheets over nanometer scale thickness could be precisely controlled via simply adjusting the HCl concentration...
September 13, 2017: Nanoscale
Yifan Li, Zhenghan Di, Jinghong Gao, Ping Cheng, Chunzhi Di, Ge Zhang, Bei Liu, Xinghua Shi, Lingdong Sun, Lele Li, Chun-Hua Yan
Creating nanoparticle dimers has attracted extensive interest. However, it still remains a great challenge to synthesize heterodimers with asymmetric compositions and synergistically enhanced functions. In this work, we report the synthesis of high quality heterodimers composed of porphyrinic nanoscale metal-organic frameworks (nMOF) and lanthanide-doped upconversion nanoparticles (UCNPs). Due to the dual optical properties inherited from individual nanoparticles and their interactions, absorption of low energy photons by the UCNPs is followed by energy transfer to the nMOFs, which then undergo activation of porphyrins to generate singlet oxygen...
September 12, 2017: Journal of the American Chemical Society
Hongwei Huang, Shuchen Tu, Xin Du, Yihe Zhang
Introducing a polarization electric field in photocatalyst system is regarded asa new concept for photocatalytic activity enhancement. In this work, we first unearth that the spontaneous polarization of ferroelectric BaTiO3 promotes the photocatalytic and molecular oxygen activation performance of the narrow-band-gap semiconductor BiOI. Ferroelectric tetragonal-phase BaTiO3 (T-BaTiO3) were prepared via calcination of nonferroelectric cubic-phase BaTiO3 (C-BaTiO3), and their polarization ability was verified via ultrasonication-assisted piezoelectric catalytic degradation...
September 6, 2017: Journal of Colloid and Interface Science
Gong Zhang, Zhang Wu, Huijuan Liu, Qinghua Ji, Jiuhui Qu, Jinghong Li
Inspired by living systems, the construction of smart devices that can self-heal in response to structural damage is a promising technology for maintaining the high activity and stability of catalysts during heterocatalytic reactions. Here this study demonstrates an ingenious platform that enabled efficient persulfate (PS) activation for contaminant degradation via integrating a catalyst with photoactuation regeneration. Under irradiation, it is unambiguously confirmed that the collective properties of a tailored FeOOH@C3 N4 catalyst permit interfacial photoexcited electron transport from the photocatalyst substrate to needle-shaped FeOOH...
September 12, 2017: Small
Sasa Lukic, Jasper Menze, Philipp Weide, Wilma Busser, Markus Winterer, Martin Muhler
Chemical vapor synthesis (CVS) is a unique method to prepare well-defined photocatalyst materials with both large specific surface area and a high degree of crystallinity. The obtained β-Ga2O3 nanoparticles were optimized for photocatalysis by reductive photodeposition of the Rh/CrOx cocatalyst system. The influence of the degree of crystallinity and the specific surface area on photocatalytic aqueous methanol reforming and overall water splitting (OWS) was investigated by synthesizing β-Ga2O3 samples in the temperature range from 1000˚C to 1500˚C...
September 11, 2017: ChemSusChem
Chang Liu, Ai-Yong Zhang, Yang Si, Dan-Ni Pei, Han-Qing Yu
Electrochemical degradation of refractory pollutants at low bias before oxygen evolution exhibits high current efficiency and low energy consumption, but its severe electrode fouling largely limits practical applications. In this work, a new anti-fouling strategy was developed and validated for electrochemical pollutant degradation by photochemical oxidation on facet-tailored {001}-exposed TiO2 single crystals. Electrode fouling from anodic polymers at a low bias was greatly relieved by the bulk-free •OH-mediated photocatalysis under UV irradiation, thus efficient and stable degradation of bisphenol A, a typical environmental endocrine disrupter, and treatment of landfill leachate were accomplished without remarkable oxygen evolution in synergistic photo-assisted electrochemical system...
September 11, 2017: Environmental Science & Technology
Andrea Guerrero-Corella, Ana María Martinez-Gualda, Fereshteh Ahmadi, Enrique Ming, Alberto Fraile, José Alemán
The photocatalyzed synthesis of sulfoxides from alkenes and thiols has been carried out using Eosin Y. This is a metal-free method which uses a low catalyst loading, atmospheric oxygen as the oxidant, and visible light conditions (green light). A mechanism has been proposed that is consistent with the experimental results.
September 11, 2017: Chemical Communications: Chem Comm
Andreia Betina Kreuser Dos Santos, Elis Marina Turini Claro, Renato Nallin Montagnolli, Jaqueline Matos Cruz, Paulo Renato Matos Lopes, Ederio Dino Bidoia
Electrochemically assisted photocatalysis (by electronic drainage) is a highly promising method for disinfection of water. In this research, the efficiency of photolytic oxidation using UV-A radiation and electrochemically assisted photocatalysis (with electric potential of 1.5 V) was studied by using electrodes prepared by thermal treatment and doped with silver, for inactivation of Escherichia coli and Staphylococcus aureus. The Chick-Watson microorganism inactivation model was applied and the electrical energy consumption of the process was calculated...
September 7, 2017: Journal of Environmental Management
Liang-Liang Mao, Huan Cong
Heterogeneous visible light photocatalysis represents an important direction toward the development of sustainable organic synthesis. In this Communication, we report visible light-induced, heavy metal-free atom transfer radical addition to unactivated terminal olefins using the combination of heterogeneous titanium dioxide as photocatalyst and a hypervalent iodine(III) reagent as co-initiator. The reaction can be applied to a range of substrates with good functional group tolerance under very mild condition...
September 9, 2017: ChemSusChem
Yi-Feng Cheng, Wenling Jiao, Qingqing Li, Yu Zhang, Sesi Li, Dandan Li, Renchao Che
Two hierarchical ZnO micro/nano-materials have been prepared by a short-time (45min) hydrothermal reaction without any surfactants. The different morphologies have been characterized comprehensively by XRD, SEM, TEM and XPS technologies. The hierarchical micro- and nano-structures are respectively consisted by the subordinate nano-pieces and nano-hexagonal-rods. Under the illumination of the simulated solar light, the nano-piece-aggregate spends 40min to degrade the 98% of rhodamine 6G solution (10(-5)mol/L), whereas the nano-rod-aggregate only degrades the 78% of the solution in the same condition...
August 31, 2017: Journal of Colloid and Interface Science
Suneel Kumar, Ashish Kumar, Ashish Bahuguna, Vipul Sharma, Venkata Krishnan
In the pursuit towards the use of sunlight as a sustainable source for energy generation and environmental remediation, photocatalytic water splitting and photocatalytic pollutant degradation have recently gained significant importance. Research in this field is aimed at solving the global energy crisis and environmental issues in an ecologically-friendly way by using two of the most abundant natural resources, namely sunlight and water. Over the past few years, carbon-based nanocomposites, particularly graphene and graphitic carbon nitride, have attracted much attention as interesting materials in this field...
2017: Beilstein Journal of Nanotechnology
Ji-Zhou Kong, Hai-Fa Zhai, Wei Zhang, Shan-Shan Wang, Xi-Rui Zhao, Min Li, Hui Li, Ai-Dong Li, Di Wu
N-doped ZnO/g-C3N4 composites have been successfully prepared via a facile and cost-effective sol-gel method. The nanocomposites were systematically characterized by XRD, FE-SEM, HRTEM, FT-IR, XPS, and UV-vis DRS. The results indicated that compared with the pure N-doped ZnO, the absorption edge of binary N-doped ZnO/g-C3N4 shifted to a lower energy with increasing the visible-light absorption and improving the charge separation efficiency, which would enhance its photocatalytic activity. Compared with the pure g-C3N4, ZnO, N-doped ZnO and the composite ZnO/g-C3N4, the as-prepared N-doped ZnO/g-C3N4 exhibits a greatly enhanced photocatalytic degradation of methylene blue and phenol under visible-light irradiation...
September 6, 2017: Nanoscale Research Letters
Qing-Yuan Meng, Xue-Wang Gao, Tao Lei, Zan Liu, Fei Zhan, Zhi-Jun Li, Jian-Ji Zhong, Hongyan Xiao, Ke Feng, Bin Chen, Ye Tao, Chen-Ho Tung, Li-Zhu Wu
Copper compounds involved in photocatalysis have recently spurred considerable interest for their novel transformations. However, mechanistic investigations are still in infancy. We find a new type of reaction, that is, Cu(II) salt-catalyzed C-H functionalization of aromatic amines triggered by visible light irradiation. An array of mechanistic observations, including high-resolution mass spectrometry, ultraviolet-visible absorption spectrum, electron spin resonance, x-ray absorption near-edge structure, and density functional theory calculation, have identified the key intermediates generated in situ in the transformation...
August 2017: Science Advances
Muzammil Anjum, Hasan A Al-Talhi, Saleh A Mohamed, Rajeev Kumar, M A Barakat
Biogas production using waste activated sludge (WAS) is one of the most demanding technologies for sludge treatment and generating energy in sustainable manner. The present study deals with the photocatalytic pretreatment of WAS using ZnO-ZnS@polyaniline (ZnO-ZnS@PANI) nanocomposite as means for increasing its degradability for improved biogas production by anaerobic digestion (AD). Photocatalysis accelerated the hydrolysis of WAS and increased the sCOD by 6.7 folds after 6 h and transform tCOD into bioavailable sCOD...
September 2, 2017: Journal of Environmental Management
Yuichi Yamaguchi, Sho Usuki, Yoshihiro Kanai, Kenji Yamatoya, Norihiro Suzuki, Ken-Ichi Katsumata, Chiaki Terashima, Tomonori Suzuki, Akira Fujishima, Hideki Sakai, Akihiko Kudo, Kazuya Nakata
Bacteriophage (denoted as phage) infection in the bacterial fermentation industry is a major problem, leading to the loss of fermented products such as alcohol and lactic acid. Currently, the prevention of phage infection is limited to biological approaches, which are difficult to apply in an industrial setting. Herein, we report an alternative chemical approach using ground Rh-doped SrTiO3 (denoted as g-STO:Rh) as a visible-light-driven photocatalyst. The g-STO:Rh showed selective inactivation of phage without bactericidal activity when irradiated with visible light (λ > 440 nm)...
September 5, 2017: ACS Applied Materials & Interfaces
Yuanxing Fang, Xinchen Wang
Metal-free catalysts have revolutionized the field of catalysis. These catalysts present distinct advantages over metal and metal oxide catalysts, such as lower cost and higher reliability and sustainability. Among the non-metal compounds used in catalysis, boron-containing compounds possessing a few unique properties have been developed. In this review, the recent advances in the field of boron-involved metal-free catalysts are presented, including binary and ternary boron-containing catalytic materials. Additionally, the three main applications of boron-containing catalysts are addressed, namely, electrocatalysis, thermal catalysis and photocatalysis, in which the functions of boron for the specific catalytic application are discussed in depth...
September 5, 2017: Angewandte Chemie
Martin Pumera
The ever increasing need for renewable and clean energy resources as well as environmental concerns are considered as two serious challenges of today's society. Photocatalysis has proved to be a reliable and effective technology to overcome these issues. However, in order to bring the full potential of this approach into reality, two main hurdles of fast charge recombination and the limited visible light absorption should be tackled. To address these obstacles, nanocomposites based on titanium dioxide nanostructures and semiconducting two-dimensional transition metal dichalcogenides (2D TMDs) have been developed and proven to be excellent photocatalysts...
September 5, 2017: Chemistry: a European Journal
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