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Impact of vacuum ultraviolet (VUV) intensity on the performance of VUV irradiation for the mineralization of trimethoprim in neutral media: Kinetics, mechanisms, and by-products formation

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Abstract

A comparative study on the mineralization of antibiotic trimethoprim (TMP) in neutral medium was investigated by applying irradiation with five types of ultraviolet lamps. Among these lamps, the whole envelope of one lamp contained ordinary quartz, which could only transmit ultraviolet-C (UVC) light. For the other four lamps, approximately one tenth, a quarter, a half, and full of envelopes were comprised of high-purity synthetic quartz, which can transmit both vacuum ultraviolet (VUV) and UVC light. TMP decay was well fitted to pseudo-first-order reaction kinetics and occurred more quickly as the VUV intensity increased. Poor mineralization was achieved in the absence of VUV light, whereas the mineralization efficiency was also enhanced with increasing VUV intensity. The presence of hydroxyl radicals (OH), superoxide radicals (O2•−) and singlet oxygen (1O2) during VUV photolysis of water was confirmed by electron paramagnetic resonance (EPR) analysis. Appropriate radical quenching experiments and fluorescent molecular probe detection provided the evidence that OH played a significant role in TMP mineralization. Higher VUV intensity favored the generation of H2O2 and OH. The evolution of NH4+ and NO3 as well as carboxylic acids (formic, acetic, oxalic, and oxamic acids) released in the treated solution were quantified. Ten aromatic intermediates were also identified by UPLC-QTOF-MS. Thereby, a plausible reaction sequence for TMP mineralization in VUV/UVC photolysis was finally proposed.

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Data availability

The data sets used or analyzed in the current study are available from the corresponding author upon reasonable request.

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Funding

The authors gratefully acknowledge the financial support of this work by the Fundamental Research Funds for the Central Universities (No. 2022JBZY034) and National Natural Science Foundation of China (Nos. 51978036, 51478029, 51438011).

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Authors and Affiliations

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Contributions

Wen Lu: Investigation; Validation; Data Curation; Formal analysis; Writing—Original Draft

Songyu Ren: Methodology; Writing—Review & Editing

Yanyu Zhang: Conceptualization; Methodology; Writing—Review & Editing

Ximeng Wen: Investigation; Validation

Zhongguo Zhang: Writing—Review & Editing

Aimin Wang: Conceptualization; Methodology; Writing—Review & Editing; Supervision

Corresponding author

Correspondence to Aimin Wang.

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The author declare no competing interests.

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Responsible Editor: Sami Rtimi

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Highlights

• UV lamps with different VUV intensities were applied to photodegrade TMP;

• The existence of OH, O2•-, and 1O2 in the VUV system was demonstrated;

• The role of the photogenerated H2O2 and OH in TMP degradation was investigated;

• A comprehensive TMP degradation pathway during VUV photolysis was proposed.

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Supplementary file1 (DOCX 1790 KB)

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Lu, W., Ren, S., Zhang, Y. et al. Impact of vacuum ultraviolet (VUV) intensity on the performance of VUV irradiation for the mineralization of trimethoprim in neutral media: Kinetics, mechanisms, and by-products formation. Environ Sci Pollut Res 30, 120590–120604 (2023). https://doi.org/10.1007/s11356-023-30612-7

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  • DOI: https://doi.org/10.1007/s11356-023-30612-7

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