Department of Environmental Science and Engineering, School of Geographical Science, Nanjing Normal University, China.
Bull Environ Contam Toxicol. 2011 Sep;87(3):297-302. doi: 10.1007/s00128-011-0352-6. Epub 2011 Jun 28.
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.
本研究采用水/全氟癸烷负载臭氧气-液两相体系去除水中的有害有机化合物。选择对氯硝基苯作为有害有机物，考察了两相臭氧化体系的效率。分别考察了初始水相 pH 值、搅拌速度、初始臭氧/对氯硝基苯摩尔比（M）和自由基清除剂对去除率的影响。结果表明，在 25°C 下，臭氧在全氟碳中的分解速率常数 k 为 0.0035 min(-1)，溶解度为 61.94mg/L。与 pH 值为 2.0 相比，水相 pH 值较高（8.0）会提高水/全氟碳两相臭氧化体系中对氯硝基苯的去除率。在水/全氟碳两相臭氧化体系中，随着初始 M 值的升高，对氯硝基苯的去除率也随之升高。需要控制搅拌速度以保持水/全氟碳两相体系的适当速度。与传统的气/水臭氧化体系相比，NaHCO(3)（20mmol/L）对水/全氟碳臭氧化体系中对氯硝基苯的降解没有明显的负面影响。水/全氟碳体系中臭氧化的氧化效率优于传统的气/水体系。
