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Hydrogen peroxide‐assisted photocatalysis under solar light irradiation: Interpretation of interaction effects between an active photocatalyst and H 2 O 2
Author(s) -
Feilizadeh Mehrzad,
Attar Farid,
Mahinpey Nader
Publication year - 2019
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.23455
Subject(s) - photocatalysis , hydrogen peroxide , degradation (telecommunications) , irradiation , response surface methodology , central composite design , materials science , composite number , kinetics , nuclear chemistry , chemical engineering , chemistry , photochemistry , catalysis , composite material , physics , chromatography , organic chemistry , computer science , telecommunications , nuclear physics , engineering , quantum mechanics
In this work, the combination of H 2 O 2 and an active visible‐light‐driven photocatalyst (Ag‐S/PEG/TiO 2 ) was utilized under natural solar radiation for the degradation of 2‐nitrophenol (2‐NP), and interaction effects between the photocatalyst and hydrogen peroxide were analyzed. For this purpose, experiments were designed using the response surface methodology based on the central composite design. The resulting data was utilized to obtain a model for the prediction of response (the degradation efficiency) as a function of two independent factors (H 2 O 2 concentration and the photocatalyst loading). The statistical analysis indicated that optimum values of each of the two independent factors decreased by increasing the other one and vice versa. Moreover, it was found that adding the optimal amount of H 2 O 2 to the solution, which contained just the photocatalyst, can enhance the degradation significantly (up to 45 %). However, using higher concentrations of H 2 O 2 may decrease the efficiency. The global optimum condition was found to be 545 ppm and 316 mM for Ag‐S/PEG/TiO 2 loading and H 2 O 2 concentration, respectively. In this condition, the degradation efficiency of 2‐NP reached 92.4 % after only 45 min of solar light irradiation.