Performance of Ag-TiO<sub>2</sub>Photocatalysts towards the Photocatalytic Disinfection of Water under Interior-Lighting and Solar-Simulated Light Irradiations

Castro, Camilo A.; Jurado, A. Jiménez; Sissa, Diana; Giraldo, Sonia A.

doi:10.1155/2012/261045

Cited by 25 publications

(18 citation statements)

References 56 publications

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“…Although Ag nanoparticles are prone to oxidation, they have a stronger LSPR effect than Au nanoparticles and their LSPR resonant wavelength can be tuned to a longer visible wavelength. More importantly, Ag nanoparticles and Ag ions are very efficient at killing hundreds of different bacterial strains thanks to different attacking mechanisms [2,198]. This is a valuable benefit of using Ag nanoparticles without an isolation layer.…”

Section: Ag/tio 2 and Ag-tio 2 Similarly Ag/tio 2 Andmentioning

confidence: 99%

Plasmonic photocatalysis

et al. 2013

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Plasmonic photocatalysis has recently facilitated the rapid progress in enhancing photocatalytic efficiency under visible light irradiation, increasing the prospect of using sunlight for environmental and energy applications such as wastewater treatment, water splitting and carbon dioxide reduction. Plasmonic photocatalysis makes use of noble metal nanoparticles dispersed into semiconductor photocatalysts and possesses two prominent features-a Schottky junction and localized surface plasmonic resonance (LSPR). The former is of benefit to charge separation and transfer whereas the latter contributes to the strong absorption of visible light and the excitation of active charge carriers. This article aims to provide a systematic study of the fundamental physical mechanisms of plasmonic photocatalysis and to rationalize many experimental observations. In particular, we show that LSPR could boost the generation of electrons and holes in semiconductor photocatalysts through two different effects-the LSPR sensitization effect and the LSPR-powered bandgap breaking effect. By classifying the plasmonic photocatalytic systems in terms of their contact form and irradiation state, we show that the enhancement effects on different properties of photocatalysis can be well-explained and systematized. Moreover, we identify popular material systems of plasmonic photocatalysis that have shown excellent performance and elucidate their key features in the context of our proposed mechanisms and classifications.

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Section: Ag/tio 2 and Ag-tio 2 Similarly Ag/tio 2 Andmentioning

confidence: 99%

Plasmonic photocatalysis

et al. 2013

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“…It indicates that loaded Ag affected in increase of anatase phase in TiO 2 , due to the rearrangement of titanium and oxygen ions in anatase grain boundaries, which would be greatly disturbed by the silver ions. The transferring of materials in anatase grains increased energy for the movement of anatase grain boundary, resulting in slower grain growth [29]. But at a 5 wt.…”

Section: Effect Of Ratio Of Sio 2 :Al 2 O 3 In Zeymentioning

confidence: 99%

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

2020

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TiO2-based photocatalysts synthesized by the microwave-assisted sol-gel method was tested in the photocatalytic glucose conversion. Modifications of TiO2 with type-Y zeolite (ZeY) and metals (Ag, Cu, and Ag-Cu) were developed for increasing the dispersion of TiO2 nanoparticles and increasing the photocatalytic activity. Effects of the TiO2 dosage to zeolite ratio (i.e., TiO2/ZeY of 10, 20, 40, and 50 mol %) and the silica to alumina ratio in ZeY (i.e., SiO2:Al2O3 of 10, 100, and 500) were firstly studied. It was found that the specific surface area of TiO2/ZeY was 400–590 m2g−1, which was higher than that of pristine TiO2 (34.38 m2g−1). The good properties of 20%TiO2/ZeY photocatalyst, including smaller particles (13.27 nm) and high surface area, could achieve the highest photocatalytic glucose conversion (75%). Yields of gluconic acid, arabinose, xylitol, and formic acid obtained from 20%TiO2/ZeY were 9%, 26%, 4%, and 35%, respectively. For the effect of the silica to alumina ratio, the highest glucose conversion was obtained from SiO2:Al2O3 ratio of 100. Interestingly, it was found that the SiO2:Al2O3 ratio affected the selectivity of carboxylic products (gluconic acid and formic acid). At a low ratio of silica to alumina (SiO2:Al2O3 = 10), higher selectivity of the carboxylic products (gluconic acid = 29% and formic acid = 32%) was obtained (compared with other higher ratios). TiO2/ZeY was further loaded by metals using the microwave-assisted incipient wetness impregnation technique. The highest glucose conversion of 96.9 % was obtained from 1 wt. % Ag-TiO2 (40%)/ZeY. Furthermore, the bimetallic Ag-Cu-loaded TiO2/ZeY presented the highest xylitol yield of 12.93%.

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“…This surface modification opens the doors to the use of this catalyst in solar reactors, since metal-doped TiO 2 activates under visible light [111,112]. In this case, copper in concentrations <5% wt.…”

Section: Particle Generation In Supercritical Fluidsmentioning

confidence: 98%

Greenhouse Effect Mitigation Through Photocatalytic Technology

Rincón

Camarillo

Martínez

et al. 2014

Environment, Energy and Climate Change I

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Climate change is one of the most critical issues facing the world. One of the pillars of the fight against this phenomenon is the mitigation of greenhouse gas (GHG) emissions, CO 2 in particular. Although many achievements have already been made in CO 2 capture and storage technologies, promising methods to convert waste streams concentrated in this gas into valuable products are currently under way. This chapter intends to describe one of them, the photocatalytic reduction of CO 2 to fuel products, that is, the reaction to produce fuel between the CO 2 molecules and a reducing agent (usually water), in the presence of a semiconductor material that provides electrons (e À ) and holes (h + ) when it is illuminated by light of appropriate energy. Moreover, if solar energy were employed as light source, this type of energy difficult to store could be transformed into liquid or gaseous fuels, useful in conventional power production systems. In this chapter, firstly, a wide review about photocatalysis fundamentals, photocatalysts, synthesis of particles in supercritical fluids, characterization techniques, photocatalytic reactors, etc., is carried out. Subsequently, previous results from the authors' research on this subject are shown. More specifically, the characteristics of photocatalysts synthesized in a supercritical medium to convert CO 2 into fuels are presented and discussed.

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Performance of Ag-TiO₂Photocatalysts towards the Photocatalytic Disinfection of Water under Interior-Lighting and Solar-Simulated Light Irradiations

Cited by 25 publications

References 56 publications

Plasmonic photocatalysis

Plasmonic photocatalysis

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Greenhouse Effect Mitigation Through Photocatalytic Technology

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Performance of Ag-TiO2Photocatalysts towards the Photocatalytic Disinfection of Water under Interior-Lighting and Solar-Simulated Light Irradiations

Cited by 25 publications

References 56 publications

Plasmonic photocatalysis

Plasmonic photocatalysis

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Greenhouse Effect Mitigation Through Photocatalytic Technology

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Performance of Ag-TiO₂Photocatalysts towards the Photocatalytic Disinfection of Water under Interior-Lighting and Solar-Simulated Light Irradiations