TY - JOUR
T1 - Methylthionine chloride degradation on pilot UV-C reactors
T2 - Kinetics of photolytic and heterogeneous photocatalytic reactions
AU - Zaruma-Arias, P. E.
AU - Núñez-Núñez, C. M.
AU - Villanueva-Fierro, I.
AU - Cháirez-Hernández, I.
AU - Lares-Asseff, I. A.
AU - Gurrola-Reyes, J. N.
AU - Proal-Nájera, J. B.
N1 - Publisher Copyright:
© 2021, Universidad Autonoma Metropolitana. All rights reserved.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - Methylthionine Chloride (MTC), commonly known as methylene blue, is a substance widely used in medical and clinical industry as indicator, various diseases treatment and diagnostic. When MTC is discarded out of the organism, it becomes a residue which ends in wastewater treatment plants and it is not treated or removed. In the present work, MTC was treated through advanced oxidation processes (AOPs) photolysis and heterogeneous photocatalysis, in three pH magnitudes (3.5, 7.2 and 9.5), and comparing when 1 mMol of H2O2/L of sample was added or not at the beginning of the experiment. MTC degradation reached 62.9 and 54.1%, for photolysis and photocatalysis, respectively, both in acid pH conditions and adding H2O2 to the sample. Kinetic constants (K) were calculated, showing acid pH as more effective; likewise, half life time decreases under these conditions. With Student-t statistic test, K from both processes were compared, resulting acidic and basic pH significantly different, but not neutral. For both processes and in the best MTC degradation conditions, the values of electric-energy-per order (EEO) were calculated in kWh/m3/order, 3.75 and 5.03, for photolysis and photocatalysis, respectively.
AB - Methylthionine Chloride (MTC), commonly known as methylene blue, is a substance widely used in medical and clinical industry as indicator, various diseases treatment and diagnostic. When MTC is discarded out of the organism, it becomes a residue which ends in wastewater treatment plants and it is not treated or removed. In the present work, MTC was treated through advanced oxidation processes (AOPs) photolysis and heterogeneous photocatalysis, in three pH magnitudes (3.5, 7.2 and 9.5), and comparing when 1 mMol of H2O2/L of sample was added or not at the beginning of the experiment. MTC degradation reached 62.9 and 54.1%, for photolysis and photocatalysis, respectively, both in acid pH conditions and adding H2O2 to the sample. Kinetic constants (K) were calculated, showing acid pH as more effective; likewise, half life time decreases under these conditions. With Student-t statistic test, K from both processes were compared, resulting acidic and basic pH significantly different, but not neutral. For both processes and in the best MTC degradation conditions, the values of electric-energy-per order (EEO) were calculated in kWh/m3/order, 3.75 and 5.03, for photolysis and photocatalysis, respectively.
KW - Conduction band
KW - Electron/hole generation
KW - Methylene blue
KW - Recalcitrant compounds degradation
KW - TiO/SiO photocatalyst
UR - http://www.scopus.com/inward/record.url?scp=85108518871&partnerID=8YFLogxK
U2 - 10.24275/rmiq/Cat2035
DO - 10.24275/rmiq/Cat2035
M3 - Artículo
AN - SCOPUS:85108518871
SN - 1665-2738
VL - 20
SP - 649
EP - 662
JO - Revista Mexicana de Ingeniera Quimica
JF - Revista Mexicana de Ingeniera Quimica
IS - 2
ER -