Experimental investigation of Taylor vortex photocatalytic reactor for water purification

Dutta, Paritam K.; Ray, Ajay K.

doi:10.1016/j.ces.2004.07.091

Cited by 94 publications

(51 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As the reaction proceeds, the density of hydroxyl groups on the catalyst surface decreases, consequently the activity of the catalyst drops. Experimental results (Dutta and Ray, 2004) indicated that strongly adsorbed intermediates occupied the active sites on the catalyst surface and led to the loss of photocatalytic activity. Therefore, more efforts should be focused on eliminating the intermediates that occupy the active sites of the catalyst and regenerate the hydroxyl radicals.…”

Section: Mode Of Application: Suspended Vs Immobilized Systemmentioning

confidence: 97%

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Ahmed

Rasul

Brown

et al. 2011

Journal of Environmental Management

749

316

View full text Add to dashboard Cite

In recent years, the application of heterogeneous photocatalytic water purification processes has gained wide attention due to its effectiveness in degrading and mineralizing the recalcitrant organic compounds as well as the possibility of utilizing the solar UV and visible-light spectrum. This paper aims to review and summarize the recent works on the titanium dioxide (TiO(2)) photocatalytic oxidation of pesticides and phenolic compounds, predominant in storm and wastewater effluents. The effects of various operating parameters on the photocatalytic degradation of pesticides and phenols are discussed. Results reported here suggest that the photocatalytic degradation of organic compounds depends on the type and composition of the photocatalyst and, light intensity, initial substrate concentration, amount of catalyst, pH of the reaction medium, ionic components in water, solvent types, oxidizing agents/electron acceptors, catalyst application mode, and calcination temperature in the water environment. A substantial amount of research has focused on the enhancement of TiO(2) photocatalysis by modification with metal, non-metal and ion doping. Recent developments in TiO(2) photocatalysis for the degradation of various pesticides and phenols are also highlighted in this review. It is evident from the literature survey that photocatalysis has good potential to remove a variety of organic pollutants. However, there is still a need to determine the practical utility of this technique on a commercial scale.

show abstract

Section: Mode Of Application: Suspended Vs Immobilized Systemmentioning

confidence: 97%

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Ahmed

Rasul

Brown

et al. 2011

Journal of Environmental Management

749

316

View full text Add to dashboard Cite

show abstract

“…1. The flow patterns and instabilities produced in this canonical flow geometry have been extensively studied over the course of many decades [11][12][13][14][15][16][17][18][19][20][21][22], and Taylor vortex flow patterns have been used in many varied applications such as water purification [23], emulsion polymerization [24,25], liquid-liquid extraction [26,27], pigment preparation [28], photocatalysis [29], culture of animal cells [30], and cultivation of microalgae [31][32][33][34]. Nevertheless, despite the sustained and significant attention that Taylor vortex flow has received and the multiphase nature of many of its applications, multiphase TaylorCouette flow remains relatively poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement of oxygen mass transfer and bubble size distribution in an air–water multiphase Taylor–Couette vortex bioreactor

Ramezani

Kong

Gao

et al. 2015

Chemical Engineering Journal

View full text Add to dashboard Cite

h i g h l i g h t sMean bubble size, and size distribution in vertical gas-liquid Taylor vortex flow. Mass transfer coefficients for vertical gas-liquid Taylor vortex flow. Wall-driven shear produces prolate rather than oblate bubble shapes. Bubble size and spatial distribution explains low mass transfer coefficients. High wall area in annular geometry has significant impact on mass transfer. a b s t r a c tExperimental measurements of the volumetric liquid mass transfer and bubble size distribution in a vertically oriented semi-batch gas-liquid Taylor-Couette vortex reactor with radius ratio g = r i /r o = 0.75 and aspect ratio C = h/(r o À r i ) = 40 were performed, and the results are presented for axial and azimuthal Reynolds number ranges of Re a = 11.9-143 and Re H = 0-3.5 Â 10 4 , respectively. Based on these data, power-law correlations are presented for the dimensionless Sauter mean diameter, bubble size distribution, bubble ellipticity, and volumetric mass transfer coefficient in terms of relevant parameters including the axial and azimuthal Reynolds numbers. The interaction between wall-driven Taylor vortices and the axial passage of buoyancy-driven gas bubbles leads to significantly different dependencies of the mass transfer coefficient on important operating parameters such as inner cylinder angular velocity and axial superficial gas velocity than has been observed in horizontally oriented gas-liquid Taylor vortex reactors. In general, the volumetric mass transfer coefficients in vertical Taylor vortex reactors have a weaker dependence upon both the axial and azimuthal Reynolds numbers and are smaller in magnitude than those observed in horizontal Taylor vortex reactors or in stirred tank reactors. These findings can be explained by differences in the size and spatial distribution of gas bubbles in the vertically oriented reactor in comparison with the other systems.

show abstract

“…For instance, in separating plasma from blood could be mentioned. More recently there has been an interest in further uses of the Couette system, such as a photocatalytic reactor for water purification [27] and as a bioreactor to culture animal cells [28].…”

Section: Introductionmentioning

confidence: 99%

A novel and developed approximation for motion of a spherical solid particle in plane coquette fluid flow

Hamidi

Rostamiyan

Ganji

et al. 2013

Advanced Powder Technology

View full text Add to dashboard Cite

Experimental investigation of Taylor vortex photocatalytic reactor for water purification

Cited by 94 publications

References 30 publications

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Experimental measurement of oxygen mass transfer and bubble size distribution in an air–water multiphase Taylor–Couette vortex bioreactor

A novel and developed approximation for motion of a spherical solid particle in plane coquette fluid flow

Contact Info

Product

Resources

About