title: Investigation into adsorption and photocatalytic degradation of gaseous benzene in an annular fluidized bed photocatalytic reactor.
abstract: The adsorption and photocatalytic degradation of gaseous benzene were investigated considering the operating variables and kinetic mechanism using nano-titania agglomerates in an annular fluidized bed photocatalytic reactor (AFBPR) designed. The special adsorption equilibrium constant, adsorption active sites, and apparent reaction rate coefficient of benzene were determined by linear regression analysis at various gas velocities and relative humidities (RH). Based on a series of photocatalytic degradation kinetic equations, the influences of operating variables on degradation efficiency, apparent reaction rate coefficient and half-life were explored. The findings indicated that the operating variables have obviously influenced the adsorption/photocatalytic degradation and corresponding kinetic parameters. In the photocatalytic degradation process, the relationship between photocatalytic degradation efficiency and RH indicated that water molecules have a dual-function which was related to the structure characteristics of benzene. The optimal operating conditions for photocatalytic degradation of gaseous benzene in AFBPR were determined as the fluidization number at 1.9 and RH required related to benzene concentration. This investigation highlights the importance of controlling RH and benzene concentration in order to obtain the desired synergy effect in photocatalytic degradation processes.
authors.affiliation: a Department of Chemistry - Chemical & Environment Engineering , Weifang University , Weifang , Shandong Province , People's Republic of China.
authors.forename: Qijin
authors.initials: Q
authors.lastname: Geng
authors.forename: Shankang
authors.initials: S
authors.lastname: Tang
authors.forename: Lintong
authors.initials: L
authors.lastname: Wang
authors.forename: Yunchen
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D001554:Benzene / Q000737:chemistry*; D006813:Humidity; D010782:Photolysis; D013816:Thermodynamics
chemical_list: D001554:Benzene
keywords: annular fluidized bed photocatalytic reactor; benzene; kinetics; nano-titania agglomerate; photocatalytic degradation