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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2021

Kinetic-invariant analysis of dye degradation in an annular slurry bubble-column photo reactor

Guncha Munjal , Ashok N. Bhaskarwar and Amita Chaudhary ORCID logo EMAIL logo


Heterogeneous photocatalysis refers to the series of oxidation and reduction reactions on a semiconductor surface by the electrons and holes generated by absorption of light by the catalyst. This method is widely used for the degradation of dyes and their mixtures present in the textile effluent, and involves two main aspects, viz. a photocatalyst, and a photoreactor. TiO2 nanoparticles are well explored and among the best known photocatalysts used worldwide. Annular slurry bubble-column reactor is a commonly used photoreactor for dye(s) degradation. This research paper explores the effects of different parameters like air-flow rate, photocatalyst loading, and initial dye concentration on the dye degradation in an annular slurry bubble-column photoreactor. The results showed that the best dye degradation efficiencies were reported at an aeration rate of 1.7 × 10−4 m3/s and at a catalyst loading of 1.5 kg/m3. Higher the initial concentration of dye, the greater is the time taken for complete degradation and mineralization. A kinetic-invariant method, which is based on the dimensionless representation of existing data to predict the new experimental results, is used to develop a semi-empirical reactor performance equation. It can be used to predict the concentration of dye undergoing degradation in the photocatalytic reactor at any time without a need for further experimentation.

Corresponding authors: Ashok N. Bhaskarwar, Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India, E-mail: ; and Amita Chaudhary, Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India; and Department of Chemical Engineering, Nirma University, Ahmedabad 382481, India, E-mail:

Funding source: IIT-Delhi

  1. Author contributions: Guncha Munjal- Conceptualization, Experimentation, Methodology, Formal analysis, Validation, Writing – Original Draft, Ashok N Bhaskarwar – Guidance and Supervision, Amita Chaudhary – Review & Editing, Visualization.

  2. Research funding: IIT-Delhi provided an Institute Fellowship to Ms. Guncha Munjal during 2010–2015.

  3. Conflict of interest statement: Not applicable.

  4. Ethics approval: Not applicable.

  5. Consent to participate: All participators have given consent.

  6. Consent for publication: All participators have given consent.


Adegboyega Salu, O., M. Adams, P. K. J. Robertson, L. S. Wong, and C. McCullagh. 2011. “Remediation of Oily Wastewater from an Interceptor Tank Using a Novel Photocatalytic Drum Reactor.” Desalination and Water Treatment 26 (1–3): 87–91, doi: in Google Scholar

Bhaskarwar, A. N. 1991. “Kinetic Invariant Model of Dissolution with Chemical Reaction of Large Particles.” AIChE Journal 37 (3): 340–46.10.1002/aic.690370304Search in Google Scholar

Chen, C. C., C. S. Lu, Y. C. Chung, and J. L. Jan. 2007. “UV Light Induced Photodegradation of Malachite Green on TiO 2 Nanoparticles.” Journal of Hazardous Materials 141: 520–28, doi: in Google Scholar

Chong, M. N., B. Jin, C. W. K. Chow, and C. Saint. 2010. “Recent Developments in Photocatalytic Water Treatment Technology: A Review.” Water Research 44 (10): 2997–3027, in Google Scholar

Ernawati, L., R. A. Wahyuono, H. Widiyandari, D. D. Risanti, A. W. Yusariarta, Rebeka, and V. Sitompul. 2020. “Experimental Data of CaTiO3 Photocatalyst for Degradation of Organic Pollutants (Brilliant Green Dye) – Green Synthesis, Characterization and Kinetic Study.” Data in Brief 32: 106099, doi: in Google Scholar

Habibi, M. H., A. Hassanzadeh, and S. Mahdavi. 2005. “The Effect of Operational Parameters on the Photocatalytic Degradation of Three Textile Azo Dyes in Aqueous TiO2 Suspensions.” Journal of Photochemistry and Photobiology A: Chemistry 172 (1): 89–96, doi: in Google Scholar

Hameed, B. H., and T. W. Lee. 2009. “Degradation of Malachite Green in Aqueous Solution by Fenton Process.” Journal of Hazardous Materials 164: 468–72.10.1016/j.jhazmat.2008.08.018Search in Google Scholar

Houas, A., H. Lachheb, M. Ksibi, E. Elaloui, C. Guillard, and J-M. Herrmann. 2001. “Photocatalytic Degradation Pathway of Methylene Blue in Water.” Applied Catalysis B: Environmental 31 (2): 145–57, doi: in Google Scholar

Ibrahim, U., and A. Halim. 2008. “Heterogeneous Photocatalytic Degradation of Organic Contaminants over Titanium Dioxide : A Review of Fundamentals, Progress and Problems.” Journal of Photochemistry and Photobiology C: Photochemistry Reviews 9: 1–12, in Google Scholar

Konstantinou, I. K., and T. A. Albanis. 2004. “TiO2-assisted Photocatalytic Degradation of Azo Dyes in Aqueous Solution: Kinetic and Mechanistic Investigations: A Review.” Applied Catalysis B: Environmental 49 (1): 1–14, doi: in Google Scholar

Lachheb, H., E. Puzenat, A. Houas, M. Ksibi, E. Elaloui, C. Guillard, and J. M. Herrmann. 2002. “Photocatalytic Degradation of Various Types of Dyes (Alizarin S, Crocein Orange G, Methyl Red, Congo Red, Methylene Blue) in Water by UV-Irradiated Titania.” Applied Catalysis B: Environmental 39 (1): 75–90, in Google Scholar

Lakshmi, S., R. Renganathan, and S. Fujita. 1995. “Study on TiO2-Mediated Photocatalytic Degradation of Methylene Blue.” Journal of Photochemistry and Photobiology A: Chemistry 88 (2–3): 163–7, in Google Scholar

Legrini, O., E. Oliveros, and Am. Braun. 1993. “Photochemical Processes for Water Treatment.” Chemical Reviews 93 (2): 671–98, in Google Scholar

Matthews, R. W. 1989. “Photocatalytic Oxidation and Adsorption of Methylene Blue on Thin Films of Near-Ultraviolet-Illuminated TiO2.” Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases 85 (6): 1291–302, doi: in Google Scholar

Mozia, S., A. W. Morawski, M. Toyoda, and T. Tsumura. 2009. “Effect of Process Parameters on Photodegradation of Acid Yellow 36 in a Hybrid Photocatalysis – Membrane Distillation System.” Chemical Engineering Journal 150 (1): 152–9, doi: in Google Scholar

Nagajyothi, P. C., S. V. Prabhakar Vattikuti, K. C. Prabhakar Vattikuti, K. Yoo, J. Shim, and T. V. M. Sreekanth. 2020. “Green Synthesis: Photocatalytic Degradation of Textile Dyes Using Metal and Metal Oxide Nanoparticles-Latest Trends and Advancements.” Critical Reviews in Environmental Science and Technology 50 (24): 2617–723, doi: in Google Scholar

Nan, M., B. Jin, H. Y. Zhu, C. W. K. Chow, and C. Saint. 2009. “Application of H-Titanate Nanofibers for Degradation of Congo Red in an Annular Slurry Photoreactor.” Chemical Engineering Journal 150 (1): 49–54, doi: in Google Scholar

Neolaka, Y. A. B., S. N. Zakarias, Y. Lawa, J. N. Naat, D. P. Benu, A. Chetouani, H. Elmsellem, H. Darmokoesoemo, and H. S. Kusuma. 2019. “Simple Design and Preliminary Evaluation of Continuous Submerged Solid Small-Scale Laboratory Photoreactor (CS4PR) Using TiO2/NO3-@TC for Dye Degradation.” Journal of Environmental Chemical Engineering 7 (6): 103482, in Google Scholar

Yang, H., and H. Cheng. 2007. “Controlling Nitrite Level in Drinking Water by Chlorination and Chloramination.” Separation and Purification Technology 56 (3): 392–6, in Google Scholar

Received: 2021-01-05
Accepted: 2021-05-31
Published Online: 2021-06-11

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