O3/H2O2降解Atrazine效能研究

利用O₃/H²O²降解莠去津，对氧化产物进行了色谱分析，以评价该体系降解莠去津效能.莠去津初始浓度2 mg/L，7.5 mg/L的O₃单独氧化去除率为27.2%；相同O₃投量下，H²O²/O₃摩尔比0.75时，5 min莠去津的去除率最高可达96.5%，表明H²O²/O₃体系对莠去津的去除效果良好，降解速度快.以离子色谱对产物的离子进行分析，莠去津浓度下降的同时，硝酸根和氯离子浓度增高.GC-MS检测的产物和对LC-MS谱图的分析表明，有机产物中存在脱乙基、脱异丙基和脱氯莠去津，说明H²O²/O₃并不能彻底氧化莠去津，因此工程中作为主要去除单元或突发性污染事件的应急手段可能还需要与活性炭等单元联用.

Efficiency of Atrazine Degradation by O3 /H2O2

The endocrine disrupter Atrazine was oxidized by O₃/H²O² system and the products were analyzed to assess the degradation efficiency of Atrazine. When it's initial content was 2 mg/L and O₃ dosage was 7.5 mg/L, Atrazine was removed about 27.2% after 5 minutes. Under the same condition, H²O²/O₃ molar ratio was 0.75, Atrazine maximum removal rate reached 96.5%, which suggested that Atrazine could be degraded by O₃/H²O² system effectively. Ion Chromatography(IC) analysis showed that concentrations of chloride and nitrate ions were increasing along with the Atrazine content decreasing. Gas Chromatography-Mass spectrometry (GC-MS) and Liquid Chromatography-Mass spectrometry chromatograms (LC-MS) analyzing illuminated the existence of de-ethyl-atrazine, de-isopropyl-atrazine and de-chloro-atrazine, which indicated the Atrazine could not be destroyed completely by O₃/H²O² system. Consequently, it should be combined with GAC (Granular Activated Carbon) or other techniques while used as primary treatment unit or emergency measure.