首页|二价铁活化分子氧体系中溶解氧对活性自由基产生及污染物降解的影响

二价铁活化分子氧体系中溶解氧对活性自由基产生及污染物降解的影响

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构建了 Fe2+/O2/三聚磷酸钠(STPP)高级氧化体系，通过曝气实验与固定初始DO实验，分别探究了体系在持续曝气与有限溶解氧的条件下活性自由基产生能力与污染物降解效果。结果表明，在以150mL/min流量充分曝气时，Fe2+-STPP浓度由3mmol/L增加至20mmol/L，体系在中性条件下羟基自由基(HO*)的产量从0。185mmol/L增加至0。256mmol/L，对苯酚的去除率由81。4％增加到91。5％。在密闭环境中固定初始DO浓度且Fe2+-STPP浓度足量时，O2转化为HO·的转化率约为10。60％～18。05％，转化率随DO浓度增加而增大;明确了体系中HO·产生量、Fe2+消耗量、污染物降解量与初始DO浓度间的响应关系，并建立了线性方程(R2＞0。99)。
Effect of dissolved oxygen on reactive free radicals production and pollutant degradation in ferrous ion activated molecular oxygen systems
The Fe2+/O2/sodium tripolyphosphate(STPP)advanced oxidation system was constructed to investigate the ability of active radical generation and pollutant degradation under the conditions of continuous aeration and limited dissolved oxygen by aeration and fixed initial DO experiments,respectively.The results showed that under full aeration at a flow rate of 150mL/min,when the concentration of Fe2+-STPP increased from 3mmol/L to 20mmol/L,the production of hydroxyl radicals under neutral conditions increased from 0.185mmol/L to 0.256mmol/L,and the removal rate of phenol increased from 81.4％to 91.5％.When the initial DO concentration was fixed in the confined environment and the Fe2+-STPP concentration was sufficient,the conversion of O2 to HO·was about 10.60％～1 8.05％,and the conversion rate increased with the increase of DO concentration.The amounts of the cumulative HO·produced and the consumed reducing agent Fe2+were quantified,and the response relationship between the amount of pollutants degraded and the initial DO concentration was clarified,and their linear correlation equation was also established(R2＞0.99).

molecular oxygen activationsodium tripolyphosphate(STPP)reactive free radicalsdissolved oxygen concentrationresponse relationshipferrous ironcontaminant degradation

王瑛琪、张成武、王德玉、付玉丰、张慧、秦传玉

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吉林大学地下水资源与环境教育部重点实验室,石油化工污染场地控制与修复技术国家地方联合工程实验室,吉林省水资源与环境重点实验室,吉林长春 130021

分子氧活化 三聚磷酸钠 活性自由基 溶解氧浓度 响应关系 二价铁 污染物降解

吉林省科技发展计划项目吉林大学2022年研究生创新研究计划项目

20230101132JC2022217

2024

中国环境科学
中国环境科学学会

中国环境科学

CSTPCDCHSSCD北大核心
影响因子：2.174
ISSN：1000-6923
年,卷(期)：2024.44(1)
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