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

Catalysts

Ralf Dillert¹  DetlefW. Bahnemann²  Mohamed Faycal Atitar²  Adel.A. Ismail³ 

[1] Building Research Center, Kuwait Institute for Scientific Research (KISR), P.O. Box 24885, Safat 13109, Kuwait;Institut für Technische Chemie, Leibniz Universität Hannover, Callinstrasse 3, D-30167 Hannover, Germany;;Nanotechnology and Advanced Materials Program, Energy &

关键词: bicrystalline TiO₂;    mesoporous TiO₂;    photodegradation;    kinetic model;    imazapy;    phenol;   

DOI  :  10.3390/catal9080640

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown