Abstract
Ferrous blast-furnace slag (Fe-BFS) is a by-product generated from siderurgic pyroprocesses, which contains appreciable amounts of metal(loid) oxides used in many heterogeneous catalysis reactions. In this research, Fe-BFS@graphite composites were used as feedstock to develop an active ceramic anode that demonstrated a remarkable ability to degrade tartrazine yellow (TRT-yellow) dye by electrochemical advanced oxidation processes (EAOPs). The successful construction of the device depends on controlling the specimen sintering temperature, which must avoid the irreversible polymorphic transformation from quartz-α to quartz-β to guarantee the desired mechanical and electrical properties. Using the Fe-BFS-based ceramic anode under ideal operational (composite containing 50 wt% Fe-BFS and sintered at 400°C) and experimental conditions (electrolysis performed at 20 mA cm−2 for 2 h, using acidified NaCl solution (pH = 2), and keeping the system at 45°C), it was attained 100% discoloration and 91.2% mineralization of 1.0 mmol L−1 TRT-yellow through different oxidative reactions, proving the viability of the proposed system. Long-term stability and low energy consumption are also among the advantages that make EAOPs performed with Fe-BFS-based ceramic anode an eco-innovative solution for the sustainable treatment of environmental samples polluted with azo-dyes.
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