A kinetic study of the photocatalytic degradation of 3-chlorosalicylic acid over TiO2 membranes supported on glass

Photocatalytic oxidation of oxalic acid in dilute aqueous solution, in a fully illuminated fluidized bed reactor

“…As regards the adsorption processes of C 2 O 4 H 4 , a LangmuirHinshelwood type of pattern was put forward in earlier reports, by assuming a single and uniform Langmuirian adsorption of the dicarboxylic acid (Matthews, 1987;Al-Ekabi and Serpone, 1988;Sabate et al, 1991). However, it was not still clear whether radiation affected adsorption and, therefore, photoadsorption phenomena were-in general-ignored as likely or significant factors in their proposed reaction mechanisms.…”

Industrial exploitation of photocatalysis: progress, perspectives and prospects

“…It is obvious that this mechanism permits both aerobic and anaerobic organic mineralisation, since surface hydroxyl radicals are available under strongly alkaline conditions [10]. Whilst it is possible to derive formal Langmuir-Hinshelwood kinetic models from the proposed mechanism [11,12], the adsorption constants are pH-dependent. Indeed, unlike 'dark' catalytic reactions, photocatalytic reaction rate is influenced not only by reactant(s) concentration and temperature but also by light-intensity, pH and catalyst loading.…”

Magnetic Nano-photocatalysts: Preparation, Structure, and Application

“…However, the recovery and cyclic utilization of photocatalysts are limited due to the diffi cult separation of the small particles from the medium. To overcome these drawbacks, the photocatalysts are immobilized on supports such as glass beads (Serpone et al 1986 ;Al-Ekabi and Serpone 1988 ;Sakthivel et al 2002 ) , lamp walls (Sabate et al 1991(Sabate et al , 1992 , glass plates (Anderson et al 1988 ) , fi berglass mesh (Al-Ekabi et al 1991 ;Horikoshi et al 2002 ) , porous fi lms (Sabate et al 1992a, b ;Aguado et al 1994 ) , fi ber optic cable reactor (Peill and Hoffmann 1996 ) , cellulose matrix (Zeng et al 2010 ) , silica (Ilisz et al 2004 ) , alumina (Ding et al 2001 ;Torimoto et al 1996 ) , zeolite (Reddy et al 2003 ;Anpo et al 1997 ;Noorjahan et al 2004 ) . Although the immobilization can make them recoverable, the photocatalytic activities undergo a large decrease due to the low specifi c area caused by the supports and the limit of mass transfer.…”