EES-18-331R2.pdf (5.59 MB)
Download file

Photocatalytic mineralization and degradation kinetics of sulphamethoxazole and reactive red 194 over silver-zirconium co-doped titanium dioxide: Reaction mechanisms and phytotoxicity assessment

Download (5.59 MB)
journal contribution
posted on 22.06.2018, 09:48 authored by Saraschandra Naraginti, Yi Li, Gianluca Li-PumaGianluca Li-Puma
© 2018 The photodegradation and phytotoxicity of the pharmaceutical antibiotic, sulphamethoxazole (SMX) and the azo-dye reactive-red-194 (RR194) under visible-light irradiation of TiO2nanoparticles modified by silver and zirconium was investigated. The results indicated that sulphamethoxazole and its toxic degradation by product, 3-amino-5-methylisoxazole and RR-194 could be degraded efficiently by the co-doped Zr/Ag-TiO2catalyst. PL studies and ROS generation results suggested that the effective charge separation was carried out while irradiation of the modified TiO2nanoparticles. Phytotoxicity tests demonstrated lower percentage of germination in P. vulgaris (40%), V. radiata (30%) and P. lunatus (30%) of the seeds treated with 50 ppm of SMX, compared to the seeds treated with the degradation products (100%). The results with 50 ppm of RR-194 also showed lower percentage of germination in P. vulgaris (40%), V. radiata (50%) and P. lunatus (30%) compared to the degradation products (100%). Furthermore, significant increase in root and shoot development was observed in the seeds treated with the degraded products when compared with SMX and RR-194. Overall, this study contributes to further understanding the photodegradation mechanisms, degradation products and environmental fate of SMX and RR-194 in water which helps in the evaluation and mitigation of the environmental risk of SMX and RR-194 for water reuse and crop irrigation.

Funding

The study was financially supported by the National Natural Science Foundation of China for Foreign Youth Scholars (Grant No. 51650110501), the China Postdoctoral Science Foundation (Grant No. 2016M591767), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51421006), Program for Environmental Protection in Jiangsu Province (Grant No. 2015037), and Priority Academic Program Development of Jiangsu Higher Education Institutions. The Fundamental Research Funds for the Central Universities (Grant No. 2016B10614), Priority Academic Program Development of Jiangsu Higher Education Institutions, and Top-notch Academic Programs project of Jiangsu Higher Education Institutions (TAPP)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Ecotoxicology and Environmental Safety

Volume

159

Pages

301 - 309

Citation

NARAGINTI, S., LI, Y. and LI PUMA, G., 2018. Photocatalytic mineralization and degradation kinetics of sulphamethoxazole and reactive red 194 over silver-zirconium co-doped titanium dioxide: Reaction mechanisms and phytotoxicity assessment. Ecotoxicology and Environmental Safety, 159, pp. 301-309.

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2018

Notes

This paper was accepted for publication in the journal Ecotoxicology and Environmental Safety and the definitive published version is available at https://doi.org/10.1016/j.ecoenv.2018.04.062

ISSN

0147-6513

eISSN

1090-2414

Language

en