scholarly journals Fabrication of Al-Doped TiO2Visible-Light Photocatalyst for Low-Concentration Mercury Removal

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Cheng-Yen Tsai ◽  
Tien-Ho Kuo ◽  
Hsing-Cheng Hsi
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Active Sites ◽  
Competitive Adsorption ◽  
Rutile Phase ◽  
Single Step ◽  
Light Irradiation ◽  
Plasma System ◽  
Visible Light Photocatalyst ◽  
Ti Substitution

High-quality Al-doped TiO2visible-light photocatalyst was prepared via a single-step direct combination of vaporized Ti, Al, and O2using a 6 kW thermal plasma system. Results showed that the formed Al-doped TiO2nanoparticles were a mixture of anatase and rutile phase and had a size between 10 and 105 nm. The absorption spectra of the nanoparticles shifted towards the visible light regions, depending on the Al2O3addition. Ti4+and Ti3+coexisted in the synthesized Al-doped TiO2; the Ti3+concentration, however, increased with increasing Al2O3addition due to Al/Ti substitution that caused the occurrence of oxygen vacancy. Hg0breakthrough tests revealed that the nanoparticles had an appreciable Hg0removal under visible-light irradiation. Nevertheless, moisture reduced Hg removal by the nanoparticles, especially when visible-light irradiation was applied, suggesting that the competitive adsorption between H2O and Hg species on the active sites of TiO2surface occurred.

Facile synthesized highly active BiOI/Zn2GeO4 composites for the elimination of endocrine disrupter BPA under visible light irradiation

2015 ◽  
Vol 39 (5) ◽  
pp. 3964-3972 ◽  
Author(s):  
Tao Yan ◽  
Hongye Liu ◽  
Picheng Gao ◽  
Meng Sun ◽  
Qin Wei ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Visible Light Irradiation ◽  
High Performance ◽  
Light Irradiation ◽  
Endocrine Disrupter ◽  
Visible Light Photocatalyst ◽  
Highly Active ◽  
Simple Chemical

A high-performance BiOI/Zn2GeO4 visible light photocatalyst for the decomposition of organic pollutants was fabricated using a simple chemical bath approach.

Visible light-triggered disruption of micelles of an amphiphilic block copolymer with BODIPY at the junction

2015 ◽  
Vol 51 (100) ◽  
pp. 17708-17711 ◽  
Author(s):  
Naganath G. Patil ◽  
Nitin B. Basutkar ◽  
Ashootosh V. Ambade
Keyword(s):  
Controlled Release ◽  
Block Copolymer ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Single Step ◽  
Light Irradiation ◽  
Amphiphilic Block Copolymer

Photocleavable BODIPY functionalised with ATRP initiator and alkyne was used to obtain amphiphilic block copolymer in a single step. Micellar assembly of the polymer was disintegrated under visible light irradiation with controlled release of cargo.

scholarly journals AgBr/BiOBr Nano-Heterostructure-Decorated Polyacrylonitrile Nanofibers: A Recyclable High-Performance Photocatalyst for Dye Degradation under Visible-Light Irradiation

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1718 ◽  
Author(s):  
Zhang ◽  
Qi ◽  
Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Active Sites ◽  
High Performance ◽  
Dye Degradation ◽  
Exchange Process ◽  
Light Irradiation ◽  
Component Ratio ◽  
Ion Exchange Process

Macrostructural flexible photocatalysts have been proven to have desirable recyclable properties during the photocatalytic degradation of organic pollutants in water. However, the photocatalytic activities of these photocatalysts are often unsatisfactory due to the fast recombination of charge carriers and the limited surface active sites. Herein, we developed a novel flexible photocatalyst of AgBr/BiOBr/polyacrylonitrile (PAN) composite mats (CMs) through the controllable assembly of AgBr/BiOBr nano-heterostructures on electrospun polyacrylonitrile nanofibers (PAN NFs) via a three-step synthesis route. The component ratio of AgBr to BiOBr in the CMs could be easily adjusted by controlling the in situ ion exchange process. The charge–transfer process occurring at the interface of the AgBr/BiOBr nano-heterostructures strongly hindered the recombination of photoinduced electron–hole pairs, thereby effectively enhancing the photocatalytic activity of the AgBr/BiOBr/PAN CMs. Meanwhile, the unique hierarchical inorganic/organic heterostructure of the AgBr/BiOBr/PAN CMs not only led to good flexibility, but also provided an abundance of active sites for photocatalytic reactions. Upon visible-light irradiation, AgBr/BiOBr/PAN CMs with an optimal ratio of AgBr to BiOBr components exhibited both enhanced photocatalytic activity and excellent separability during the degradation of methyl orange in water compared to the BiOBr/PAN CMs.

scholarly journals Photocatalytic Hydrogen or Oxygen Evolution from Water over S- or N-Doped TiO2under Visible Light

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
Kazumoto Nishijima ◽  
Takaaki Kamai ◽  
Naoya Murakami ◽  
Toshiki Tsubota ◽  
Teruhisa Ohno
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Water Oxidation ◽  
Photocatalytic Oxidation ◽  
High Efficiency ◽  
Uv Light ◽  
Anatase Phase ◽  
Rutile Phase ◽  
Activity Level ◽  
Light Irradiation

S- or N-doping ofTiO2powder having an anatase or rutile phase extended the photocatalytic activity for water oxidation and reduction under UV light and visible light irradiation. For the reduction of water, anatase-dopedTiO2showed higher level of activity than that of dopedTiO2having a rutile phase using ethanol as an electron donor. Furthermore, the activity level of S-dopedTiO2for hydrogen evolution was higher than that of N-dopedTiO2photocatalysts under visible light. Photocatalytic oxidation of water on dopedTiO2having a rutile phase proceeded with fairly high efficiency whenFe3+ions were used as electron acceptors compared to that on dopedTiO2having an anatase phase. In addition, water splitting under visible light irradiation was achieved by construction of a Z-scheme photocatalysis system employing the dopedTiO2having anatase and rutile phases forH2andO2evolution and theI−/IO3−redox couple as an electron relay.

scholarly journals Effective Photocatalytic Hydrogen Evolution Using Covalent Triazine Framework-Derived Carbon Nitride Nanofiber Containing Carbon Vacancies for Visible-Light-Driven

2021 ◽  
Vol 11 (16) ◽  
pp. 7222
Author(s):  
Liangjing Zhang ◽  
Aiwu Wang ◽  
Mei Zhang ◽  
Zhengyuan Jin ◽  
Huan Yi ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Active Sites ◽  
Carbon Nitride ◽  
Light Irradiation ◽  
H2 Evolution ◽  
Photoexcited Electron ◽  
Energy And Environment ◽  
Visible Light Driven ◽  
Covalent Triazine Framework

In this study, a novel fibrous carbon nitride (FCN) was prepared from laminated covalent triazine framework (CTF) via pyrolysis, using functionalized 2,5-thiophenedicarboxylic acid and melamine as the precursors. A carbon vacancy was produced by two-step calcination in argon and air atmospheres. These carbon vacancies further exposed the edges and diffusion channels of the FCN nanofibers, which accelerated photogenerated charge transfer and provided more active sites. The FCN was characterized using various techniques and used for H2 evolution under visible-light irradiation. The as-synthesized FCN exhibited excellent stability, and its photocatalytic activity for H2 evolution under visible-light irradiation was 66 times higher than that of bare C3N4 (BCN), attaining a maximum H2 evolution rate of 102.63 μmol in 6 h. The FCN remained stable following visible-light irradiation at the end of 10 cycles. The FCN benefited from the absorption of solar energy and a large number of active sites. These advantages facilitated the efficient separation of photoexcited electron-hole pairs to hinder charge recombination. This work generates new insights into the preparation of highly effective FCN photocatalysts that may be put to various applications, especially in the fields of energy and environment.

The photocatalytic NO-removal activity of g-C3N4 significantly enhanced by the synergistic effect of Pd0 nanoparticles and N vacancies

2022 ◽  
Author(s):  
Guohui Dong ◽  
Jiahao Geng ◽  
Liaoliao Zhao ◽  
Mengmeng Wang ◽  
Ho Wing-Kei
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Carbon Nitride ◽  
Competitive Adsorption ◽  
Light Irradiation ◽  
No Removal

Graphite carbon nitride (g-C3N4) has been proven to have photocatalytic activity for NO-removal under visible-light irradiation. However, the competitive adsorption between NO and O2 during the process may decrease the...

Structure and Properties Evolution of Nanostructed AgBr/TiO2 Visible Light Photocatalyst in Cyclic Running

2013 ◽  
Vol 668 ◽  
pp. 338-342 ◽  
Author(s):  
Le Wei Qin ◽  
Ke Feng He ◽  
Wan Ping Chen
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Limiting Factor ◽  
Photocatalytic Efficiency ◽  
X Ray Diffraction ◽  
Visible Light Photocatalyst ◽  
X Ray ◽  
Crystalline Growth

Nanostructured AgBr/TiO2 visible light photocatalyst was prepared through deposition-precipitation method with AgNO3, KBr and Ti(OBu )4 as the precursors. Though the photocatalyst showed a relatively high photocatalytic efficiency for degradation of methyl orange in water under visible light irradiation in the first cycle, its efficiency was obviously decreased in the subsequent cycles. X-ray diffraction indicated that there existed a dramatic crystalline growth of AgBr in the AgBr /TiO2 nanocomposite after visible light irradiation, which must increase the recombination rate of photo-generated electrons and holes and be responsible for the observed decrease in photocatalytic efficiency. Photo-induced crystalline growth of AgBr may be a limiting factor for the lifetime of AgBr/TiO2 visible light photocatalyst and more attention should be paid to it.

Synthesis and enhanced photocatalytic activity of a BiOI/TiO2 nanobelt array for methyl orange degradation under visible light irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (43) ◽  
pp. 36881-36887 ◽  
Author(s):  
Qizhi Teng ◽  
Xiaosong Zhou ◽  
Bei Jin ◽  
Jin Luo ◽  
Xuyao Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Methyl Orange Degradation ◽  
Visible Light Photocatalyst

A novel heterojunction by facet coupling of BiOI onto TiO2 nanobelt arrays (NBAs) as a visible light photocatalyst was achieved through a hydrothermal method.

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