Abstract
Heterogeneous photocatalysis, using photocatalysts in suspension to eliminate diverse contaminants, including textile wastewater, has several advantages. Nevertheless, current absorbance and decolorization measurements imply sample acquisition by extraction at a fixed rate with consequent photocatalyst removal. This study presents online monitoring for the decolorization of six azo dyes, Orange PX-2R (OP2), Remazol Black B133 (RB), Procion Crimson H-EXL (PC), Procion Navy H-EXL (PN), Procion Blue H-EXL (PB), and Procion Yellow H-EXL (PY), analyzing the spectrum measured in situ by using the light scattering provided by the photocatalyst in suspension. The results obtained have corroborated the feasibility of obtaining absorbance and decolorization measurements, avoiding disturbances in the process due to a decrease in the volume in the reactor.
Highlights
Water pollution is presently one of the most worrying health problems, influencing the life of all living beings
H-EXL (PN), Procion Blue H-EXL (PB), and Procion Yellow H-EXL (PY), analyzing the spectrum measured in situ by using the light scattering provided by the photocatalyst in suspension
We propose a novel implementation for the online monitoring of dye decolorization in photocatalytic in suspension reactors, which can be adapted to different reactor geometries, profiting from the natural process of scattering to measure the color removal
Summary
Water pollution is presently one of the most worrying health problems, influencing the life of all living beings It influences, among sectors with a large influence in the production of wastewater, the textile industry [1,2,3], which uses more than 100,000 different dyes, with roughly 280,000 tons lost in textile effluents every year [4,5]. Synthetic azo dyes account for approximately 800,000 tons, widely used because of their high reactivity and color resilience [6,7,8] For their mineralization and degradation, advanced oxidation processes (AOPs) are commonly used [8,9,10]. Among the AOPs, photocatalytic processes are highlighted due to their high efficiency in the removal of contaminants, including synthetic dyes [11,12]
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