羟基乙叉二膦酸对Fe2+活化O2降解污染物的强化效果及机制

茹金涛; 王德玉; 张成武; 李媛; 刘柯阳; 秦传玉

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中国环境科学 ›› 2024, Vol. 44 ›› Issue (6) : 3142-3150.

水污染与控制

羟基乙叉二膦酸对Fe²⁺活化O₂降解污染物的强化效果及机制

茹金涛^1,2,3, 王德玉^1,2,3, 张成武^1,2,3, 李媛^1,2,3, 刘柯阳^1,2,3, 秦传玉^1,2,3

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Enhancement effect and mechanism of 1-Hydroxyethylidene-1,1-diphosphonic acid on Fe²⁺ activated O₂ degrading pollutants

RU Jin-tao^1,2,3, WANG De-yu^1,2,3, ZHANG Cheng-wu^1,2,3, LI Yuan^1,2,3, LIU Ke-yang^1,2,3, QIN Chuan-yu^1,2,3

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摘要

羟基乙叉二膦酸(HEDP)常与Fe²⁺形成Fe²⁺-HEDP配合物,本文验证了HEDP存在可以促进Fe²⁺活化分子氧产生活性自由基(ROS),研究结果显示添加2mmol/L HEDP后,Fe²⁺/O₂体系中苯酚(10mg/L)的降解效果从0.69%提升到69.31%,在此过程中,体系中的HEDP还能够实现部分自降解.电子自旋共振(ESR)和掩蔽实验结果表明体系中主要ROS为HO^•和O₂^•–,双电子传递途径(O₂ → H₂O₂→ HO^•)是体系中产生HO^•的主要方式.在3.0～9.0的pH值范围内,HEDP都能够促进ROS的产生和污染物的降解,常见环境阴离子对体系影响较小.

Abstract

1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP) often formed Fe²⁺-HEDP complexes with Fe²⁺. In this study, HEDP was verified to promote the production of reactive oxygen species (ROS) from Fe²⁺ activated molecular oxygen. The results showed that after adding 2mmol/L of HEDP, the degradation effect of phenol (10mg/L) in the Fe²⁺/O₂ system increased from 0.69% to 69.31%. In the process, the HEDP in the system was partially self-degraded. The results of electron spin resonance (ESR) and quenching experiments indicated that the main ROS in the system were HO^• and O₂^•－, and the two-electron transfer pathway (O₂ → H₂O₂ → HO^•) was the main way to generate HO^•. Within the pH range of 3.0~9.0, HEDP stimulated the generation of ROS and facilitated the degradation of pollutants. Besides, the presence of common environmental anions had minimal influence on the system.

导出引用

茹金涛, 王德玉, 张成武, 李媛, 刘柯阳, 秦传玉. 羟基乙叉二膦酸对Fe²⁺活化O₂降解污染物的强化效果及机制[J]. 中国环境科学. 2024, 44(6): 3142-3150

RU Jin-tao, WANG De-yu, ZHANG Cheng-wu, LI Yuan, LIU Ke-yang, QIN Chuan-yu. Enhancement effect and mechanism of 1-Hydroxyethylidene-1,1-diphosphonic acid on Fe²⁺ activated O₂ degrading pollutants[J]. China Environmental Science. 2024, 44(6): 3142-3150

中图分类号： X703

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