Application of Fe0 aggregate to active persulfate oxidation (PS/Fe0)for decoloration of polyazo direct dye Sirius�Red F3B (SRF3B, Direct red 80) was studied. The decoloration was affected by pH, dye concentration, persulfate and Feo dosages, and temperature. Low PS dosage hindered the decoloration and a two-stage oxidation process, i.e., slow heterogeneous reaction occurring on Fe0 surface and fast homogeneous reaction occurring in the solution, was observed. The depletion of SRF3B within the slow-stage and fast-stage followed zero-order rate law and modified pseudo-first order kinetics, respectively. The activation energy (Ea) of PS/Fe0 system was 5.11 kJ/mol confirming that the decoloration was a fast reaction process. A 95% decoloration efficiency achieved within 10 min by PS/Fe0 in treating 25 mg/L SRF3B (equivalent to ADMI 8276 and COD 95 mg/L) and the four azo links of SRF3B were totally broken down. Fe0 aggregate was reusable. PS/Fe0 is a fast-effective process for SRF3B decoloration.

Fast-effective persufate decoloration of polyazo direct dye Sirius<sup>�</sup>Red F3B activated with Fe<sup>0</sup> aggregate

248th National Meeting (2014)

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Fast-effective persufate decoloration of polyazo direct dye Sirius�Red F3B activated with Fe0 aggregate

Fast-effective persufate decoloration of polyazo direct dye Sirius^�Red F3B activated with Fe⁰ aggregate