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研究论文

摘要：利用热活化过硫酸盐（S₂O₈^2-）技术去除水中的阿特拉津（ATZ）.结果表明，增加溶液中S₂O₈^2-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S₂O₈^2-的浓度都成正比.初始pH为3.0~10.0时，S₂O₈^2-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^-、CO₃^2-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CO₃^2-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 CO₃^2- 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 CO₃^2- 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.

Key words：atrazine persulfate advanced oxidation technology radical scavenger