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Kinetic modelling for the photocatalytic degradation of phenol by using TiO 2 ‐coated glass raschig rings under simulated solar light
Author(s) -
Sampaio Maria J,
Silva Cláudia G,
Silva Adrián M T,
Faria Joaquim L
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4571
Subject(s) - raschig ring , photocatalysis , hydrogen peroxide , phenol , degradation (telecommunications) , materials science , irradiation , chemical engineering , chemistry , catalysis , packed bed , organic chemistry , computer science , physics , nuclear physics , engineering , telecommunications
Abstract BACKGROUND Immobilisation of TiO 2 photocatalysts has proven to be an efficient technological approach concerning both practical and economical aspects. The efficiency of photocatalytic phenol degradation using glass raschig rings coated with TiO 2 Aeroxide ® P25 was evaluated in a recirculation reactor operating under simulated solar light irradiation, by comparing the first order reaction rate ( r ) as a function of several operation conditions. RESULTS The reaction rate increases with the initial phenol concentration ([ PhOH ] 0 ), the irradiation intensity ( I ), the number of TiO 2 ‐coated rings ( N ), and the hydrogen peroxide concentration [ H 2 O 2 ], and is minimally affected by the solution's flow rate ( Q ). A kinetic model was developed for the determination of the r as a function of the operating parameters. CONCLUSIONS The empirical model allows the prediction of the efficiency of the photocatalytic degradation process in a wide range of operation conditions, which can be considered a useful tool for the scaling‐up of the water treatment process. © 2014 Society of Chemical Industry