Influence of TiO2 concentration on the synergistic effect between photocatalysis and high-frequency ultrasound for organic pollutant mineralization in water

Torres-Palma, Ricardo A.; Nieto, Jessica I.; Combet, Evelyne; Pétrier, Christian; Pulgarín, C.

doi:10.1016/j.apcatb.2007.11.013

Cited by 141 publications

(70 citation statements)

References 26 publications

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“…이러한 두 가지의 초음파 화학적 효과를 이용하여 액상에 존재하는 여러 종류의 유기/무기 오염 물질을 처리할 수 있다는 것 이 지속적으로 보고되고 있으며, 단독 혹은 오존, 자외선, 광촉매, 과산화수소 등 다른 고도산화처리공정과의 혼합 공정에서 최적화된 조건을 찾기 위한 연구들이 진행되고 있다 (Torres et al, 2008;Son et al, 2009a;Son et al, 2012;Lim et al, 2009). .…”

Section: 서 론unclassified

The Effect of Distance between Two Transducers on Sonochemical Reactions in Dual Irradiation Systems

Kim¹,

Son²

2013

Journal of Soil and Groundwater Environment

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Many researchers have studied the effectiveness of ultrasound in chemical and environmental engineering fields including material synthesis, pollutant removal, cleaning, extraction, and disinfection. Acoustic cavitation induced by ultrasound irradiation in aqueous phase can cause various sonophysical and sonochemical reactions without any chemicals. However most of the previous studies focused only on the relationships between ultrasonic conditions and the results of sonochemical reactions in lab-scale sonoreactors. As a results of this, only a few studies have been devoted to design and optimization of industrial scale sonoreactors. In this study, the effect of the distance between two opposite transducer modules on sonochemical reactions was investigated in single and dual irradiation systems (334 kHz) for four distances including 50, 100, 150, and 200 mm using KI dosimetry. It was found that the dual irradiation systems provided higher performance in terms of the zeroth reaction coefficient and the cavitation yield compared to the single irradiation systems. The sonochemiluminescence (SCL) images for the visualization of the cavitation field showed that cavitation active zone was larger and sonochemical reaction intensity was much higher in the dual irradiation system than in the single irradiation system.

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Section: 서 론unclassified

The Effect of Distance between Two Transducers on Sonochemical Reactions in Dual Irradiation Systems

Kim¹,

Son²

2013

Journal of Soil and Groundwater Environment

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“…The number of active surface sites increases with TiO 2 concentration until certain loading since light penetration decreases and aggregation of TiO 2 particles increases at relative high catalyst loading [159]. It has been reported that TiO 2 photocatalysis combined with ultrasound can be benefited [72,97,159,160] due to different factors like (a) an increase in the catalyst surface area due to the aggregation action of ultrasound, which enhances the performance of the photocatalytic system [161]; (b) an improvement of mass transfer of organic compounds between the liquid phase and the TiO 2 surface [162,163]; and (c) a reduction of charge recombination and promotion production of additional OH • due to the residual H 2 O 2 generated [162,163]. Also, the continuous cleaning of the TiO 2 surface by acoustic cavitation [164] might also have some role in modifying the photocatalytic rate.…”

Section: Influence Of Catalyst Concentrationmentioning

confidence: 99%

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Gutierrez-Mata

Velázquez-Martínez

Álvarez-Gallegos

et al. 2017

International Journal of Photoenergy

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This literature research, although not exhaustive, gives perspective to solar-driven photocatalysis, such as solar photo-Fenton and TiO 2 solar photocatalysis, reported in the literature for the degradation of aqueous organic pollutants. Parameters that influence the degradation and mineralization of organics like catalyst preparation, type and load of catalyst, catalyst phase, pH, applied potential, and type of organic pollutant are addressed. Such parameters may also affect the photoactivity of the catalysts used in the studied solar processes. Solar irradiation is a renewable, abundant, and pollution-free energy source for low-cost commercial applications. Therefore, these solar processes represent an environmentally friendly alternative mainly because the use of electricity can be decreased/avoided.

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“…In single and combined treatments, there was a difference in removal between the crude enzyme entrapped in the alginate beads and the beads alone. The synergy analysis of the combined treatments was made according to [26], where a value above 1 indicates an additive effect, while a value lower than -1 indicates an antagonistic effect. The interaction of both treatments showed no effect from the combination during the 13 h of treatment, as shown in Fig.…”

Section: B Removal Of Phe In the Combined Systemmentioning

confidence: 99%

Removal of Phenanthrene in an Aqueous Matrix by Entrapped Crude Enzymes on Alginate Beads Combined with TiO2-C-Ag Coated Fiberglass

González-Ramírez¹,

Ávila-Pérez²,

Torres-Bustillos³

et al. 2017

IJESD

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Abstract-The polycyclic aromatic hydrocarbons (PAHs) are classified as a public health hazard, and priority pollutants to be eliminated from water. The degradation of PAHs is abetted by its low water solubility, yet countered by its attached to organic matter complicating the PAHs' removal from wastewater. In this study, the use of two different types of mechanisms to overcome the drawbacks of the presence of dissolved organic matter was evaluated in PHE (phenanthrene) removal. The combination of crude enzymes entrapped in alginate gels with heterogeneous photocatalysis adds the catalytic activity of the enzymes to PHE treatment without requiring special conditions. The application of photocatalysis techniques for water recuperation is subject to photon incidence over the catalyst, which affects the efficiency of the process. The combined system removed 94.3 ± 2.0% of PHE in the presence of polyoxyethylene sorbitan monooleate and dimethyl sulfoxide. The alginate gels were able to maintain the catalytic activity of the enzymes, while the TiO 2 -C-Ag was activated under low-energy UV light (365-465 nm) with the Ag islands acting as electron donors. The latter was confirmed in the surface analysis by X-ray photoelectron spectroscopy, which presented an increase in carbonyl groups in both materials and a change from Ag 0 to Ag 3+ after 13 h of treatment. The combination of both treatments improved removal in a single TiO 2 -C-Ag treatment.

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Influence of TiO2 concentration on the synergistic effect between photocatalysis and high-frequency ultrasound for organic pollutant mineralization in water

Cited by 141 publications

References 26 publications

The Effect of Distance between Two Transducers on Sonochemical Reactions in Dual Irradiation Systems

The Effect of Distance between Two Transducers on Sonochemical Reactions in Dual Irradiation Systems

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Removal of Phenanthrene in an Aqueous Matrix by Entrapped Crude Enzymes on Alginate Beads Combined with TiO2-C-Ag Coated Fiberglass

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