摘要：In this work, untreated rind of Aloe vera (URAV) was applied as an adsorbent for removing a cationic dye, methylene blue (MB) from aqueous solutions under batch experiments. Adsorption parameters such as pH, URAV dosage, contact time and MB concentration were varied to determine the efficacy of MB removal. MB was more favoured to be removed at pH > 3 and URAV showed a fast adsorption process as the time required to achieve equilibrium was 30 min. The maximum adsorption capacity recorded from the non-linear expression of Langmuir isotherm model was 356 mg/g at room temperature (300 K). Both, the pseudo-first-order and pseudo-second-order models, were appropriate to predict the MB adsorption kinetics. Among the plausible adsorption mechanisms detected from the Fourier transform infrared (FTIR) spectrometer and the pH studies were hydrogen bonding, n- and - interactions, and electrostatic attraction. Owing to the fast removal and high adsorption capacity of MB, URAV can be applied as an adsorbent for MB removal from wastewater.
关键词：Aloe vera;Adsorption kinetics;Isotherms;Methylene blue
