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Literature describes the formation of Fe (II)-phenanthroline complex (ferroin) as a stop way for Fenton processes, ceasing radicals yielding. Antagonistically, this study presents evidences that ferroin can be activated by UVA in mildly acidic media in photo-Fenton-like process. Because ferroin is the main waste from total iron determination in environmental samples, a recycling approach is suggested. Based on the best practices of waste management planning, an application of the proposed method for treating another chemical waste is presented. Titrimetric ammonia determination waste containing 2.67 mg L−1 methyl red azo dye and 1.33 mg L−1 methylene blue was degraded at the optimized experimental conditions: pH = 5.2–5.4; [H2O2] = 310 mg L−1; [Ferroin] = 1.4 mg L−1; temperature = 36 ± 1 °C; reaction time = 165 min under UV-A irradiation. Attenuation of most intense spectroscopic bands for the dyes achieved 94% (510 nm) and 96% (665 nm) for methyl red and methylene blue, respectively, with degradation of ferroin itself. The present work brings empirical evidence that is possible to recycling ferroin as photo-Fenton-like process catalyst, besides to determine the best conditions for providing less acidic treated effluents with negligible suspended solid concentration, better than obtained from classical photo-Fenton processes.

The work refers to reduced graphene oxide (rGO) synthesis, characterization and its application on TX-100 surfactant removal. After adsorption, rGO/TX-100 loaded was submitted to desorption step and reused two times, reducing the process costs.

Esse projeto objetiva a determinação da concentração do azocorante vermelho de metila (VM) presente em um efluente contendo outras substâncias coloridas (ferroína e azul de metileno-AM), durante a sua degradação por um processo oxidativo avançado (POA) definido como Fenton-type; de posse dos valores de concentração em função do tempo de degradação, estudos cinéticos serão conduzidos.