研究论文
廖云燕,刘国强,赵力,孔德洋,陆隽鹤.利用热活化过硫酸盐技术去除阿特拉津[J].环境科学学报,2014,34(4):931-937
利用热活化过硫酸盐技术去除阿特拉津
- Removal of atrazine in heat activated persulfate oxidation process
- 基金项目：国家自然科学基金项目（No.51178224）；高等学校博士学科点专项基金项目（No.20100097120017）
- 作者
- 单位
- 廖云燕
- 南京农业大学资源与环境科学学院, 南京 210095
- 刘国强
- 南京农业大学资源与环境科学学院, 南京 210095
- 赵力
- 南京农业大学资源与环境科学学院, 南京 210095
- 孔德洋
- 环境保护部南京环境科学研究所, 南京 210042
- 陆隽鹤
- 南京农业大学资源与环境科学学院, 南京 210095
- 摘要：利用热活化过硫酸盐（S2O82-）技术去除水中的阿特拉津（ATZ）.结果表明，增加溶液中S2O82-浓度或提高溶液反应温度，可加速ATZ的降解.ATZ的降解是一个二级反应，其速率和溶液中ATZ和S2O82-的浓度都成正比.初始pH为3.0~10.0时，S2O82-对ATZ都有很好的降解效果，在酸性和中性时，降解效率高于碱性条件.利用自由基探针发现，在酸性和中性条件下，起降解作用的主要是SO4·-，而碱性条件下OH·占主导.ATZ的降解受到Cl-、CO32-和腐殖质（HA）的影响.其中，Cl-对反应的影响比较复杂，低浓度时Cl-会生成具有高氧化还原电位的Cl·促进ATZ的降解，而高浓度时Cl·会继续反应生成氧化能力相对较弱的Cl2·-，从而抑制反应的进行.HA和CO32-都对反应有明显的抑制作用.
- Abstract：The removal of atrazine (ATZ) by heat activated persulfate was systematically studied in this work. We focused on the influences of persulfate concentration, temperature, pH, humic acid (HA), Cl- and CO32- on the performance of the treatment process. It was demonstrated that the degradation of ATZ was a second-order reaction. The reaction rate was proportional to the concentrations of both ATZ and persulfate. The reaction rate increased with elevated temperature. The removal of ATZ was optimal at a wide range of pH (3.0~10.0), although slightly less efficient at basic condition. Radical scavenger test indicated that OH·was the predominant radical species at basic condition while SO4·- played a critical role at neutral and acidic conditions. The removal of ATZ was slightly inhibited in the presence of HA. The adverse effect of CO32- was more prominent. Cl- showed a complicated effect on the removal of targeted pollutant. When Cl- was less than 10 mmol·L-1, the degradation was promoted. However, removal efficiency of ATZ was reduced at higher concentrations due to its competence with oxidants.
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