Synergistic effect of sorption and photocatalysis on the degree of dye removal in single and multicomponent systems on ZnO-SnO2

Olga Długosz,Marcin Banach,Anita Staroń,Paulina Brzoza

doi:10.1007/s11356-021-18044-7

Olga Długosz, Marcin Banach + Show 2 more

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https://doi.org/10.1007/s11356-021-18044-7

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Abstract

The paper presents the photodegradation process of one-, two- and three-component dye mixtures by ZnO-SnO2 nanoparticles. After 60 min of running the processes, the dye removal efficiencies of 76.44, 72.69, 62.43, 77.00 and 92.46% for MB, RB, TB, MO and YQ degradation, respectively, were obtained. For binary and ternary systems, dye removal efficiencies for all cases exceeded 70%. When the binary and ternary dye mixtures were tested, the photodegradation efficiencies of ZnO-SnO2 were similar to those of the single mixtures, indicating that this material could be used in industrial applications in the future. The focus of the study was to investigate the effect of sorption on photodegradation efficiency and the presence of both cationic and anionic dyes on their degradation efficiency under UV light. The significance of the effect of sorption on the degradation efficiency allowing the interaction of the catalyst with the dyes removed was confirmed. The main factor influencing sorption and consequently photocatalysis was the nature of the dye. It was confirmed that the positively charged ZnO-SnO2 surface effectively sorbs the dyes and causes their degradation.

Highlights

Due to the increase of pollutants that are present in water, the use of standard water treatment methods is insufficient
The aim of the study is to indicate the possibility of using ZnO nanoparticles modified with tin(IV) oxide as a photocatalyst in the processes of decomposition of dyes in aqueous solution under UV light in single and multicomponent systems
In systems where the sorption efficiency does not exceed, 5% of the degree of degradation of dyes is about 70%

Summary

Introduction

Due to the increase of pollutants that are present in water, the use of standard water treatment methods is insufficient. New pollutant removal technologies that are effective, economical and environmentally friendly are being intensively sought. One such method is the removal of contaminants from the aqueous phase by photocatalytic degradation of organic compounds in the presence of ZnO nanostructures (Jiang and Pi 2018). The nanoscale zinc oxide can currently be considered one of the most important semiconducting oxides. This is due to its unique properties, including high chemical stability, high electrochemical coupling coefficient, wide radiation absorption range and high photostability (Siddiqi et al 2018). Zinc oxide has a wider, compared to TiO2, energy band which is about

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