Interference effects in H₂O₂ quantification: A comparative study of three common methods in photocatalytic systems.

Authors

Peng Zhang, Songli Liu, Jiankang Wang, Youqing Yu, Guoqing Zhang

Published in

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. Volume 363. Issue Pt 1. Pages 128326. Jun 27, 2026. Epub Jun 27, 2026.

Abstract

Precise measurement of the production of H₂O₂ during the photocatalytic process is important for the performance assessment of photocatalysts. N,N-diethyl-1,4-phenylenediamine (DPD) method, iodometry method and cerium sulfate Ce(SO₄)₂ titration method are currently the most widely employed in relevant research. However, the effectiveness and reliability of these methods have rarely been systematically investigated. In this study, using g-C₃N₄, TiO₂, ZnSe and resorcinol formaldehyde (RF) as model photocatalysts, a comparative analysis of these three methods was conducted. The results demonstrate that certain byproducts are formed during the production of H₂O₂, and they act as interferents that compromise the accuracy of the measurement. Although Ce(SO₄)₂ titration method is accurate for standard H₂O₂ solutions, it usually overestimates the production of H₂O₂ in the photocatalytic process. Nitrogen species, particularly NO₂^-, are key interferents influencing the measurement. Moreover, the iodometric method is highly susceptible, as NO₂^- amplifies the formation of through a catalytic cycle, which induces a significant and time-dependent overestimation. Among the methods, the DPD method demonstrates excellent anti-interference capability.

PMID:
42372324
Bibliographic data and abstract were imported from PubMed on 30 Jun 2026.

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