TY - GEN
T1 - The role of pH in the decomposition of organic micropollutants during the heterogeneous photocatalysis process
AU - Kudlek, Edyta
AU - Dudziak, Mariusz
AU - Bohdziewicz, Jolanta
AU - Kamińska, Gabriela
N1 - Publisher Copyright:
© The Authors, published by EDP Sciences,2017.
PY - 2017/5/24
Y1 - 2017/5/24
N2 - The study investigated that the change in the pH ranged from 5 to 7 affects the adsorption degree of selected organic micropollutants such as: polycyclic aromatic hydrocarbons (anthracene, benzo[a]pyrene), pharmaceutical compounds (diclofenac) and industrial additives (octylphenol and pentachlorophenol) on the photocatalyst surface (100 mg TiO2/dm3). For example, in suspension of pH 5 a 12% reduction in the concentration of octylphenol was noted, while in the suspension of pH 7 the concentration of this compound was reduced by 64%. In the case of anthracene an inverse relationship was observed. The concentration of this micropollutant decreased by 94% for pH 5 and only by 61% for pH 7 suspension. With the commencement of UV irradiation of reaction mixtures a gradual increase in the concentration of micropollutants reduction in aqueous solutions was observed. This indicates the decomposition of compounds as a result of their reaction with highly reactive OH• radicals or other reactive oxygen species generated during the process. For reaction mixtures of pH 7, already in the first 15 minutes, higher degrees of removal of micropollutants ware observed compared to suspension of pH 6. The obtained micropollutants removal degrees exceeded 91% for diclofenac, octylphenol, pentachlorophenol and amounted to 100% for anthracene and benzo(a)pyrene.
AB - The study investigated that the change in the pH ranged from 5 to 7 affects the adsorption degree of selected organic micropollutants such as: polycyclic aromatic hydrocarbons (anthracene, benzo[a]pyrene), pharmaceutical compounds (diclofenac) and industrial additives (octylphenol and pentachlorophenol) on the photocatalyst surface (100 mg TiO2/dm3). For example, in suspension of pH 5 a 12% reduction in the concentration of octylphenol was noted, while in the suspension of pH 7 the concentration of this compound was reduced by 64%. In the case of anthracene an inverse relationship was observed. The concentration of this micropollutant decreased by 94% for pH 5 and only by 61% for pH 7 suspension. With the commencement of UV irradiation of reaction mixtures a gradual increase in the concentration of micropollutants reduction in aqueous solutions was observed. This indicates the decomposition of compounds as a result of their reaction with highly reactive OH• radicals or other reactive oxygen species generated during the process. For reaction mixtures of pH 7, already in the first 15 minutes, higher degrees of removal of micropollutants ware observed compared to suspension of pH 6. The obtained micropollutants removal degrees exceeded 91% for diclofenac, octylphenol, pentachlorophenol and amounted to 100% for anthracene and benzo(a)pyrene.
UR - https://www.scopus.com/pages/publications/85020293546
U2 - 10.1051/e3sconf/20171700047
DO - 10.1051/e3sconf/20171700047
M3 - Conference contribution
AN - SCOPUS:85020293546
T3 - E3S Web of Conferences
BT - 9th Conference on Interdisciplinary Problems in Environmental Protection and Engineering, EKO-DOK 2017
A2 - Piekarska, Katarzyna
A2 - Kutylowska, Malgorzata
A2 - Trusz-Zdybek, Agnieszka
A2 - Kazmierczak, Bartosz
PB - EDP Sciences
T2 - 9th Conference on Interdisciplinary Problems in Environmental Protection and Engineering, EKO-DOK 2017
Y2 - 23 April 2017 through 25 April 2017
ER -