Abstract
Leaves of cranberry (CR), Origanum (OR) and Lavandula (LV) were used as eco-friendly adsorbents in this study. The adsorbents were used for the adsorption of Lissamine Green B dye (LD) from water. The adsorption of LD onto CR, OR and LV was dependent on their concentration, solution pH, contact time, and temperature. The analysis of FT-IR, XRD and SEM for the CR, OR, and LV surfaces shows the presence of many functional groups and many micro-sized particles, which help absorb dye molecules on the adsorbents surfaces. Adsorption of kinetic and isothermal models have been applied. The results show the adsorption occurs based on the assumption of the pseudo-second-order kinetic model by chemisorption and mechanism of internal diffusion. Adsorption processes follow the Langmuir and Freundlich curves. In addition, the adsorption process is exothermic and spontaneous. (C) 2019 National Institute of Oceanography and Fisheries. Hosting by Elsevier B.V.