Enhancement effect and mechanism of 1-Hydroxyethylidene-1,1-diphosphonic acid on Fe2+ activated O2 degrading pollutants
RU Jin-tao1,2,3, WANG De-yu1,2,3, ZHANG Cheng-wu1,2,3, LI Yuan1,2,3, LIU Ke-yang1,2,3, QIN Chuan-yu1,2,3
1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China; 2. National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun 130021, China; 3. Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun 130021, China
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.
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