Effects of iron (hydr)oxides on the degradation of diethyl phthalate ester in heterogeneous (photo)-Fenton reactions.
J Environ Sci (China)
; 80: 5-13, 2019 Jun.
Article
en En
| MEDLINE
| ID: mdl-30952352
ABSTRACT
This work studied the structural effects of hematite (α-Fe2O3), 2-line ferrihydrite (HFO) and goethite (α-FeOOH) on diethyl phthalate ester (DEP) degradation. The results showed that the degradation of DEP was faster under 365â¯nm light irradiation than in the dark in the presence of iron (hydr)oxides. The apparent kinetic rates of DEP degradation followed the order HFOâ¯>â¯goethiteâ¯≈â¯hematite in the dark and HFOâ¯>â¯hematiteâ¯>â¯goethite under 365â¯nm light irradiation. Two pathways governed H2O2 decomposition efficiency on iron (hydr)oxide surfaces (1) forming OH on inherent surface hydroxyl groups (Fe-OH) and (2) producing O2 and H2O on the surface oxygen vacancies. X-ray photoelectron spectroscopy (XPS) analyses indicated that HFO not only has high Fe-OH content but also has high Vo content, resulting in its low H2O2 utilization efficiency (η). DEP was degraded through hydrogen abstraction and de-esterification, and the major products were (OH)2-DEP, mono-ethyl phthalate (MEP), OH-MEP, and phthalate acid (PA). The study is important in understanding the transformation of phthalate esters in top surface soils and surface waters under ultraviolet light.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Ácidos Ftálicos
/
Compuestos Férricos
/
Modelos Químicos
Idioma:
En
Año:
2019
Tipo del documento:
Article