TY - JOUR

T1 - Photodegradation of Herbicide Imazapyr and Phenol over Mesoporous Bicrystalline Phases TiO2: A Kinetic Study

AU - Atitar, Mohamed Faycal

AU - Ismail, Adel A.

AU - Dillert, Ralf

AU - Bahnemann, Detlef W.

N1 - Funding information: Acknowledgments: M. F. Atitar gratefully acknowledges a scholarship from The German Academic Exchange Service (DAAD) in the Frame of a Sandwich-Program. A.A. Ismail acknowledges the Alexander von Humboldt (AvH) Foundation for granting him a renewed research fellowship. This work was supported by Saint-Petersburg State University via a research Grant ID 32706707. The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover. M. F. Atitar gratefully acknowledges a scholarship from The German Academic Exchange Service (DAAD) in the Frame of a Sandwich-Program. A.A. Ismail acknowledges the Alexander von Humboldt (AvH) Foundation for granting him a renewed research fellowship. This work was supported by Saint-Petersburg State University via a research Grant ID 32706707. The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover.

PY - 2019/8

Y1 - 2019/8

N2 - Mesoporous TiO2 nanoparticles were synthesized at different temperatures (400–800◦C). The resulting mesoporous anatase–rutile TiO2 mixtures between 27 and 82% were found to have different structural properties (morphology, mesoporosity, crystallite phases, and sizes) affected through the calcination process. They were tested for the photocatalytic degradation of the herbicides imazapyr and phenol, compared with the nonporous TiO2 P-25. The present work is an extension of a previously published study discussing the influence of the rutile content on the photocatalytic performance of the nanocrystals, based on the modified first order kinetic model, where the degradation rate is a function of the specific surface area of the material. The apparent degradation rate using T-800 is 10-fold higher than in the case using TiO2 P-25. The material with the lowest anatase content (T-800) exhibits the highest photocatalytic activity in terms of initial reaction rate per unit surface area. It is considered that mixed-phase photocatalysts with rutile–anatase exhibit enhanced photoactivity with the increase of the rutile proportion.

AB - Mesoporous TiO2 nanoparticles were synthesized at different temperatures (400–800◦C). The resulting mesoporous anatase–rutile TiO2 mixtures between 27 and 82% were found to have different structural properties (morphology, mesoporosity, crystallite phases, and sizes) affected through the calcination process. They were tested for the photocatalytic degradation of the herbicides imazapyr and phenol, compared with the nonporous TiO2 P-25. The present work is an extension of a previously published study discussing the influence of the rutile content on the photocatalytic performance of the nanocrystals, based on the modified first order kinetic model, where the degradation rate is a function of the specific surface area of the material. The apparent degradation rate using T-800 is 10-fold higher than in the case using TiO2 P-25. The material with the lowest anatase content (T-800) exhibits the highest photocatalytic activity in terms of initial reaction rate per unit surface area. It is considered that mixed-phase photocatalysts with rutile–anatase exhibit enhanced photoactivity with the increase of the rutile proportion.

KW - Bicrystalline TiO

KW - Imazapy

KW - Kinetic model

KW - Mesoporous TiO

KW - Phenol

KW - Photodegradation

UR - http://www.scopus.com/inward/record.url?scp=85070508890&partnerID=8YFLogxK

U2 - 10.3390/catal9080640

DO - 10.3390/catal9080640

M3 - Article

AN - SCOPUS:85070508890

VL - 9

JO - CATALYSTS

JF - CATALYSTS

SN - 2073-4344

IS - 8

M1 - 640

ER -