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Advanced treatment of phenol by H 2 O 2 /UV/activated carbon coupling: Influence of homogeneous and heterogeneous phase
Author(s) -
Flouret Alexandre,
de Almeida Maria Carolina,
de Oliveira Tatianne Ferreira,
de Sá Fernando Pereira
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23186
Subject(s) - hydrogen peroxide , phenol , chemistry , scavenger , aqueous solution , kinetics , phase (matter) , activated carbon , peroxide , degradation (telecommunications) , reaction rate constant , catalysis , homogeneous , aqueous two phase system , radical , carbon fibers , nuclear chemistry , organic chemistry , materials science , composite number , thermodynamics , telecommunications , physics , adsorption , quantum mechanics , computer science , composite material
Abstract In this work, a heterogeneous catalytic wet peroxide process combining activated carbon (AC) and hydrogen peroxide (H 2 O 2 )/ultraviolet radiation was applied for the aqueous‐phase removal of phenol. The influence of the pH and peroxide concentration were determined according to a factorial plan. The kinetic contribution of radical mechanisms ( δ H O °) was estimated using a radical scavenger (tert‐butyl alcohol). The degradation kinetics was modelled by a global pseudo‐first‐order kinetic model based on the sum of the effects during the treatment process. The results showed that these two variables significantly affected the percentage removal. The peroxide concentration exerted a positive effect (i.e., as the H 2 O 2 concentration increased, the percentage removal also increased). Additionally, as the pH value increased, the degradation accelerated, and the kinetic constant (k homogeneous ) increased from 0.00938 min −1 to 0.02772 min −1 . The results obtained in the presence of AC demonstrated the ability of AC to ameliorate the degradation of phenol; for example,δ h e t e r o g e n e o u swas 45.69 % to 41.35 %.