title: Degradation p-chloronitrobenzene in ozone-loaded system with perfluorodecalin solvent.
abstract: Study was carried out for the removal of hazardous organic compound from aqueous solution by using water/perfluorodecalin loaded ozone two-phase system. p-Chloronitrobenzene was used as hazardous organics to examine the efficiency of the two-phase ozonation system. Effects of initial pH in water, stirring speed, initial molar ratio of O(3)/p-chloronitrobenzene (M), and free radical scavenger on the removal rate of p-chloronitrobenzene were investigated respectively. It was revealed that ozone had low decomposed rate coefficient k = 0.0035 min(-1) and solubility of 61.94 mg/L at 25°C in perfluorocarbon. In contrast to pH 2.0, higher level of pH (8.0) in water increased the removal rate of p-chloronitrobenzene in water/perfluorocarbon two-phase ozonation system. Removal rate of p-chloronitrobenzene was increased with the elevation of initial M value in water/perfluorocarbon two-phase ozonation system. Stirring speed was needed to control with proper level of speed in water/perfluorocarbon two-phase system. Compared to the conventional gas/water ozonation system, NaHCO(3) (20 mmol/L) had no obvious negative effect on the p-chloronitrobenzene degradation in water/perfluorocarbon ozonation system. Oxidation efficiency of ozonation in water/perfluorocarbon system was superior to that of in conventional gas/water system.
authors.affiliation: Department of Environmental Science and Engineering, School of Geographical Science, Nanjing Normal University, China. lishiyin7@yahoo.com.cn
authors.forename: Shiyin
authors.initials: S
authors.lastname: Li
authors.forename: Yiping
authors.initials: Y
authors.lastname: Zhu
authors.forename: Xiaorong
authors.initials: X
authors.lastname: Li
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Wang
authors.forename: Lixiao
authors.initials: L
authors.lastname: Ni
mesh_terms: D005466:Fluorocarbons / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009578:Nitrobenzenes / Q000737:chemistry / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D017693:Sodium Bicarbonate / Q000737:chemistry; D012995:Solubility; D012997:Solvents / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D005466:Fluorocarbons; D009578:Nitrobenzenes; D012997:Solvents; D014874:Water Pollutants, Chemical; D014867:Water; C008805:perfluorodecalin; D010126:Ozone; D017693:Sodium Bicarbonate; C010407:4-chloronitrobenzene