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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摘要构建了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）.

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	王瑛琪
	张成武
	王德玉
	付玉丰
	张慧
	秦传玉

关键词 ：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

Abstract：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%~18.05%, 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).

Key words： molecular oxygen activation sodium tripolyphosphate (STPP) reactive free radicals dissolved oxygen concentration response relationship ferrous iron contaminant degradation

收稿日期: 2023-05-08

PACS:

X703

基金资助:吉林省科技发展计划项目（20230101132JC），吉林大学2022年研究生创新研究计划项目（2022217）

通讯作者: 秦传玉,教授,qincyu@jlu.edu.cn E-mail: qincyu@jlu.edu.cn

作者简介: 王瑛琪(1999-),女,黑龙江齐齐哈尔人,吉林大学硕士研究生,主要从事污染场地控制与修复方面的研究.yingqiw21@mails.jlu.edu.cn.

引用本文:

王瑛琪, 张成武, 王德玉, 付玉丰, 张慧, 秦传玉. 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[J]. 中国环境科学, 2024, 44(1): 132-139. WANG Ying-qi, ZHANG Cheng-wu, WANG De-yu, FU Yu-feng, ZHANG Hui, QIN Chuan-yu. Effect of dissolved oxygen on reactive free radicals production and pollutant degradation in ferrous ion activated molecular oxygen systems. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(1): 132-139.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I1/132

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