Photocatalytic Degradation of Water Organic Pollutants. Kinetic Modeling and Energy Efficiency

Serrano, Benito; Lasa, Hugo de

doi:10.1021/ie970104r

Cited by 68 publications

(52 citation statements)

References 14 publications

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“…Experiments were developed in two types of reactors: (a) the Photo-CREC-Water-I reactor, where the catalyst is attached to fiber glass mesh (Serrano and de Lasa, 1997), (b) the Photo-CREC-II reactor, where the catalyst is suspended as a slurry (Salaices et al, 2002).…”

Section: Methodsmentioning

confidence: 99%

“…Experiments performed using MeB have intrinsic advantages as MeB blue's color disappears as photoconversion progresses and provides a quick assessment of the reactor performance. Additional details about various experimental and analytical techniques are reported in Serrano and de Lasa (1997), Serrano (1998) and Salaices et al (2001Salaices et al ( , 2002.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Quasi-equilibrium and non-equilibrium adsorption in heterogeneous photocatalysis

Serrano¹,

Salaices²,

Ortiz³

et al. 2007

Chemical Engineering Science

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Quasi-equilibrium and non-equilibrium adsorption in heterogeneous photocatalysis

Serrano¹,

Salaices²,

Ortiz³

et al. 2007

Chemical Engineering Science

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“…Various studies have identified the existence of mass transfer limitations in many immobilized systems, such as tubular reactors [7], [8], annular reactors [9]- [11], rotating disc reactors [9], [12], and packed-bed reactors [7], [13], among others [14]. A commonly used model equation derived from first principles is a Langmuir-type equation based on volumetric flowrate Q [15], [16]:…”

Section: Introductionmentioning

confidence: 99%

Design, Mass Transfer Studies, and Optimization of an Air-Sparged Tubular Photocatalytic Reactor for the Degradation of Methylene Blue

Dalida¹,

Ramoso²

2017

IJCEA

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Abstract-An alternative process for the removal of organic pollutants in aqueous systems is photocatalysis. The challenges hindering its industrial use are electron-hole recombination and mass transfer limitations. In order to address these problems, the objective of this study is to introduce air by sparging, and design an air-sparged photocatalytic reactor using titanium dioxide immobilized on borosilicate glass. The performance of the reactor on the removal of the model pollutant, methylene blue (MB), was evaluated and compared against the reactor operated without sparging. The effect of mass transfer limitations on reactor performance was also investigated by regression using a Langmuir-type model equation. Reactor performance was optimized using Response Surface Methodology to determine the set of initial MB concentration, treatment time, initial pH, and sparging rate that would result to the highest removal of methylene blue. The sparged photocatalytic reactor was able to degrade 57% MB in 2 hours, an improvement of 40% compared to no sparging. Mass transfer limitation studies showed that the reactor operates near the reaction-limited regime, and that the extent of mass transfer limitation effects was reduced. The set of parameters that maximizes methylene blue removal were 2.0 ppm MB, 120 minutes treatment time, pH 9.95 and 2.0 L/min sparging rate, with a predicted removal of 55.5%. Validation experiments resulted to 57.2% MB removal, and that the present reactor is comparable to similar reactors in literature, but with the advantage of using less expensive materials of construction and simpler immobilization technique.Index Terms-Photocatalysis, response surface methodology, tubular photocatalytic reactor, wastewater treatment.

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“…The quantum yield was further modified into photochemical thermodynamic efficiency factor [77], which is given as:…”

Section: Introductionmentioning

confidence: 99%

TiO2 Solar Photocatalytic Reactor Systems: Selection of Reactor Design for Scale-up and Commercialization—Analytical Review

2016

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For the last four decades, viability of photocatalytic degradation of organic compounds in water streams has been demonstrated. Different configurations for solar TiO 2 photocatalytic reactors have been used, however pilot and demonstration plants are still countable. Degradation efficiency reported as a function of treatment time does not answer the question: which of these reactor configurations is the most suitable for photocatalytic process and optimum for scale-up and commercialization? Degradation efficiency expressed as a function of the reactor throughput and ease of catalyst removal from treated effluent are used for comparing performance of different reactor configurations to select the optimum for scale-up. Comparison included parabolic trough, flat plate, double skin sheet, shallow ponds, shallow tanks, thin-film fixed-bed, thin film cascade, step, compound parabolic concentrators, fountain, slurry bubble column, pebble bed and packed bed reactors. Degradation efficiency as a function of system throughput is a powerful indicator for comparing the performance of photocatalytic reactors of different types and geometries, at different development scales. Shallow ponds, shallow tanks and fountain reactors have the potential of meeting all the process requirements and a relatively high throughput are suitable for developing into continuous industrial-scale treatment units given that an efficient immobilized or supported photocatalyst is used.

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Photocatalytic Degradation of Water Organic Pollutants. Kinetic Modeling and Energy Efficiency

Cited by 68 publications

References 14 publications

Quasi-equilibrium and non-equilibrium adsorption in heterogeneous photocatalysis

Quasi-equilibrium and non-equilibrium adsorption in heterogeneous photocatalysis

Design, Mass Transfer Studies, and Optimization of an Air-Sparged Tubular Photocatalytic Reactor for the Degradation of Methylene Blue

TiO2 Solar Photocatalytic Reactor Systems: Selection of Reactor Design for Scale-up and Commercialization—Analytical Review

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