title: Kinetic analysis and energy efficiency of phenol degradation in a plasma-photocatalysis system.
abstract: Combination of two kinds of advanced oxidation processes (AOPs) is an effective approach to control wastewater pollution. In this research, a pulsed discharge plasma system with multi-point-to-plate electrode and an immobilized TiO(2) photocatalysis system is coupled to oxidize target pollutant in aqueous solution. Kinetic analysis (pseudo-first order kinetic constant, k) and energy efficiency (energy yield value at 50% phenol conversion, G(50)) of phenol oxidation in different reaction systems (plasma alone and plasma-photocatalysis) are reviewed to account for the synergistic mechanism of plasma and photocatalysis. The experimental results show that higher k and G(50) of phenol oxidation can be obtained in the plasma-photocatalysis system under the conditions of different gas bubbling varieties, initial solution pH and radical scavenger addition. Moreover, the investigation tested hydroxyl radical (OH) is the most important species for phenol removal in the synergistic system of plasma-photocatalysis as well as in the plasma alone system.
authors.affiliation: School of the Environment, Jiangsu University, Zhenjiang 212013, China. hjwang@ujs.edu.cn
authors.forename: Hui-juan
authors.initials: HJ
authors.lastname: Wang
authors.forename: Xiao-yang
authors.initials: XY
authors.lastname: Chen
mesh_terms: D000465:Algorithms; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D004735:Energy Transfer; D016166:Free Radical Scavengers; D005740:Gases / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry*; D010777:Photochemistry; D012996:Solutions; D014025:Titanium / Q000737:chemistry
chemical_list: D016166:Free Radical Scavengers; D005740:Gases; D010636:Phenols; D012996:Solutions; C009495:titanium dioxide; D014025:Titanium