Bioadsorption of CI Reactive Blue 203 dye by duckweed Lemna gibba’s powder

Abstract

: Many contaminants, especially dyes used to manufacture paint, textiles, and other products, are released into the aquatic environment as a result of human population increase and industrialization. In this study, it was chosen to develop a plant biomaterial compatible with the demand of the world market in cost terms, and to focus on the reuse of powder duckweed Lemna gibba as a new effective material for the removal of dyes in particular, considering this plant's capacity for purification even in the waste state after assisting a lagoon plant achieve phytoremediation. After analyzing the effects of pH, contact time, adsorbate concentration, and adsorbent dosage on the dye (CI Reactive Blue 203)'s adsorption process on the plant powder Lemna gibba, it was determined that the adsorption kinetics follows the pseudo first order model and the adsorption isotherm is best described by the Langmuir model, and that the percentage of dye removal reaches 90% at pH 3 of the solution, and the adsorption capacity reaches its maximum of 96% at only 0.5g of the powder and 25 mL of the solution. As a result, this study recommends using powder Lemna gibba plant as an alternative for activated carbon in adsorption.