TY - JOUR
T1 - Surface interactions and mechanistic studies of 2,4-dichlorophenoxyacetic acid degradation by catalytic ozonation in presence of Ni/TiO2
AU - Rodríguez, Julia L.
AU - Poznyak, Tatiana
AU - Valenzuela, Miguel A.
AU - Tiznado, Hugo
AU - Chairez, Isaac
N1 - Funding Information:
The authors thank the Department of Graduate Study and Investigation of the National Polytechnic Institute of Mexico (Project 20110185), the National Council of Science and Technology of Mexico-CONACyT (Projects 83593, 83275 and 153356) and UNAM PAPIIT 114209 for supporting this investigation. Also to A. Díaz for the technical support on the XPS measurements.
PY - 2013/4/15
Y1 - 2013/4/15
N2 - Surface modifications of catalysts (TiO2 and Ni/TiO2) were studied after ozonation using isoelectric point determination (IEP) and X-ray photoelectron spectroscopy (XPS) techniques. The catalysts were tested in the degradation of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution. According to the results, the initial activity of Ni/TiO2 catalysts was 26% higher compared with the conventional ozonation. This behavior was explained in terms of a change in the surface chemical composition of the catalysts after ozonation, supported by XPS results in the region O1s and Ti2p. In general, the oxidation of metallic Ni to NiO, the formation of *Ti4+ and *O species in the Ni/TiO2 (P) catalyst, and the presence of abundant -OH groups in the catalytic surface was observed.
AB - Surface modifications of catalysts (TiO2 and Ni/TiO2) were studied after ozonation using isoelectric point determination (IEP) and X-ray photoelectron spectroscopy (XPS) techniques. The catalysts were tested in the degradation of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution. According to the results, the initial activity of Ni/TiO2 catalysts was 26% higher compared with the conventional ozonation. This behavior was explained in terms of a change in the surface chemical composition of the catalysts after ozonation, supported by XPS results in the region O1s and Ti2p. In general, the oxidation of metallic Ni to NiO, the formation of *Ti4+ and *O species in the Ni/TiO2 (P) catalyst, and the presence of abundant -OH groups in the catalytic surface was observed.
KW - 2,4-D degradation
KW - Catalytic ozonation
KW - Ni/TiO catalysts
KW - Surface interactions
UR - http://www.scopus.com/inward/record.url?scp=84875585604&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2013.02.086
DO - 10.1016/j.cej.2013.02.086
M3 - Artículo
SN - 1385-8947
VL - 222
SP - 426
EP - 434
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -