Photo-assisted electrochemical degradation of simulated textile effluent coupled with simultaneous chlorine photolysis

de Mello Florêncio, Thaíla; de Araújo, Karla Santos; Antonelli, Raissa; de Toledo Fornazari, Ana Luiza; da Cunha, Paula Cordeiro Rodrigues; da Silva Bontempo, Letícia Helena; Motheo, Artur de Jesus; Granato, Ana Claudia; Malpass, Geoffroy Roger Pointer

Photo-assisted electrochemical degradation of simulated textile effluent coupled with simultaneous chlorine photolysis

2016

The influence of chloride ion concentration during the photo-assisted electrochemical degradation of simulated textile effluent, using a commercial Ti/Ru₀.₃Ti₀.₇O₂ anode, was evaluated. Initially, the effect of applied current and supporting electrolyte concentration on the conversion of chloride ions to form reactive chlorine species in 90 min of experiment was analyzed in order to determine the maximum production of reactive chlorine species. The optimum conditions encountered (1.5 A and 0.3 mol dm⁻³ NaCl) were subsequently employed for the degradation of simulated textile effluent. The efficiency of the process was determined through the analysis of chemical oxygen demand (COD), total organic carbon (TOC), of the presence of organochlorine products and phytotoxicity. Photo-assisted electrochemical degradation was more efficient for COD and TOC removal than the electrochemical technique alone. With simultaneous UV irradiation, a reduced quantity of reactive chlorine was produced, indicating that photolysis of the chlorine species led to the formation of hydroxyl radicals. This fact turns a simple electrochemical process into an advanced oxidation process.

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