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Comparative study on concentric cylindrical glass tube micro-reactor, UV-led strip photocatalytic reactor and classical annular reactor on Acid Red 87 removal

The present study is an exhaustive comparison between three types of reactors for Acid Red 87 removal using graphene oxide under combined processes. Acid Red 87 or Eosin Y is brominated flu-orescein structure which forms a red fluorescence. From late 19th century, this dye was extensively used in textile industries. The degradation of this fluorescent dye is problematic due to its high molar mass and stability. The performance of three reactor types: (1) concentric cylindrical glass tube micro- reactor (CGTR), (2) UV-LED strip photocatalytic reactor and (3) classical annular reactor were evaluated for the Acid Red 87 removal. The maximum of 94.8% dye removal and 61.5% total organic carbon removal was achieved at initial pH 6, 2 g/L catalyst dosage and 44 mM H 2 O 2 concentration under 60 min in CGTR. Further comparative parameters were calculated and the best parameter values were obtained for CGTR in terms of performance and energy efficiency.