Study of ZrIV-loaded Orange Waste Gel for Selenate Adsorption

Abstract

Adsorptive removal of selenate from aqueous phase using Zr IV -loaded orange waste gel was investigated. Adsorption kinetics showed that equilibrium was attained within 2 and 4 h for 12 and 23 mg/L of Se VI , respectively. A pseudo-second-order kinetic model was found to characterize the adsorption kinetics for all the initial selenium concentrations tested. Adsorption isotherms at various pH values were examined and the data fitted well with Langmuir model. The maximum sorption capacity was found to be 25 mg/g at optimum pH. The adsorption system was found to be favorable with separation factors between 0 and 1. Competitive adsorption by coexisting anions showed that chloride barely affected Se VI adsorption while phosphate and sulfate impeded Se VI adsorption. A ligand exchange mechanism was inferred for Se VI adsorption.

Effective Use of Biomass Wastes for Removing Hazardous Inorganic Ions from Aquatic Environment

“…We hit upon an idea to use some biomass wastes instead of synthetic ion exchange resins to effectively and selectively adsorb hazardous anionic species of arsenic [3,4], phosphorus [5,6], antimony [7], selenium [8] and fluorine [9][10][11][12]. The candidate biomass wastes are orange and apple juice residues and seaweeds wastes containing large amounts of functional groups of carboxylic acid; i.e.…”