Removal of Remazol turquoise Blue G-133 from aqueous solution using modified waste newspaper fiber

► Modified waste newspaper fiber (MWNF) was utilized as a sorbent for the removal of RTB G-133 from aqueous solution. ► The maximum adsorption capacity reached 260 mg g−1. ► Adsorption kinetics of RTB G-133 on MWNF in a batch process well followed pseudo-second order model. ► Langmuir isotherm model well described the adsorption of RTB G-133 on MWNF. ► The adsorption of RTB G-133 on MWNF is a spontaneous endothermic process.