Removal of Acid Dyes from Aqueous Solutions Using Orange Peel as a Sorbent Material

An agricultural by-product waste: orange peel was tested for the removal of four acid dyes from aqueous solutions in batch conditions. As results obtained, kinetics of dyes sorption was time of contact, initial dyes concentration and dyes type dependent. The pseudo second-order reaction rate model adequately described the kinetics of dyes sorption with high correlation coefficients. Langmuir model gave a good fit to the experimental data. A high dyes sorption was observed by this sorbent material. For Nylosane Blue, a maximum sorption capacity about 65.88 mg/g was obtained followed by Erionyl Yellow (64.14 mg/g), Nylomine Red (62.07 mg/g) and Erionyl Red (40.72 mg/g), respectively.