BIOSORPTION OF RHODAMINE B FROM AQUEOUS SOLUTION USING Araucaria angustifolia STERILE BRACTS

Abstract

This study evaluated the removal of Rhodamine B dye by biosorption using Araucaria angustifolia sterile bracts. It also aimed to evaluate the treatment of a synthetic wastewater holding that dye. The biosorbent was characterized by infrared spectroscopy and thermogravimetric analysis. Equilibrium biosorption studies were made with the exposure of biosorbent to aqueous solutions of rhodamine B at different pH and initial concentrations. Removal tests for wastewater containing dye were performed with the bracts, and efficacy was assessed by the percentage of uptake of dye and bioassays. The infrared characterization showed peaks that are features to groups on carbohydrates and lignin, the major components in bract composition. The biosorption equilibrium studies presented acid media as the best condition for dye removal. The rate-controlling step of the biosorption was found to be governed by chemical processes (second order kinetics) and shown to be a heterogeneous biosorption based on the fit to the Freundlich equation model. The treatment for synthetic wastewater (125 mg/L) reduced the mass of rhodamine B by 96 % and caused a decrease of toxic effects. The results show that sterile bracts can be considered as a low-cost alternative biosorbent to be applied on the removal of water pollutants and treatment of potentially toxic effluents.

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

“…In an alkaline environment, RB assumes the closed uncharged form of lactone. Below pH 5, favorable adsorption is indicated as a result of electrostatic interactions between the RB cation and the deprotonated sorbent surfaces, as well as by ion exchange between the RB cation and the protonated sorbent surfaces [82,84,86,87,105,106]. At higher pH, the mechanism for the adsorption of the zwitterion RB particles involves complexing a lone nitrogen pair with a metal hydroxyl group on the adsorbent surface via hydrogen bonding through a water bridge [84].…”

Raw Rice Husk Biochar as a Potential Valuable Industrial Byproduct for the Removal of Rhodamine B from Water

“…In the current scenario of water scarcity throughout the world, there is a need for sustainable, economically feasible wastewater treatment technologies that are reproducible on an industrial scale and capable of the effective removal of different types of pollutants. Water treatment using byproducts from industrial production is an inexpensive, potentially feasible option that is easily applicable for the decontamination of waters containing industrial dyes [10]. RRHB is a byproduct of the food industry that has been proposed for the sorption of pollutants with the possibility of decontaminating waters and aggregating value to the used sorbent material.…”

“…RRHB is a byproduct of the food industry that has been proposed for the sorption of pollutants with the possibility of decontaminating waters and aggregating value to the used sorbent material. Several sorbents have been tested for the removal of pollutants from water, including activated carbon, silica gel, activated alumina, zeolites, and synthetic resins [9][10][11][12]. Carbon-based materials such as RRHB are potential matrices for the sorption of hydrophilic pollutants due to their porous structures and large surface areas [13].…”

“…Water 2023, 15, x FOR PEER REVIEW 2 of 16 potentially feasible option that is easily applicable for the decontamination of waters containing industrial dyes [10]. RRHB is a byproduct of the food industry that has been proposed for the sorption of pollutants with the possibility of decontaminating waters and aggregating value to the used sorbent material.…”