Photoelectro-Fenton/nanophotocatalysis decolorization of three textile dyes mixture: Response surface modeling and multivariate calibration procedure for simultaneous determination

► Decolorization of three dyes using photoelectro-Fenton combined with photocatalysis. ► Immobilization of CNTs onto graphite plate and electrochemical generation of H2O2. ► Multivariate calibration method for simultaneous determination of three azo dyes. ► Optimization of the treatment process by central composite design.