title: Alginate-immobilized bentonite clay: adsorption efficacy and reusability for Cu(II) removal from aqueous solution.
abstract: This study evaluated the use of alginate-immobilized bentonite to remove Cu(II) as an alternative to mitigate clogging problems. The adsorption efficacy (under the influence of time, pH and initial Cu(II) concentration) and reusability of immobilized-bentonite (1% w/v bentonite) was tested against plain alginate beads. Results revealed that immobilized bentonite demonstrated significantly higher sorption efficacy compared to plain alginate beads with 114.70 and 94.04 mg Cu(II) adsorbed g(-1) adsorbent, respectively. Both sorbents were comparable in other aspects where sorption equilibrium was achieved within 6 h, with optimum pH between pH 4 and 5 for adsorption, displayed maximum adsorption capacity at initial Cu(II) concentrations of 400 mg l(-1), and demonstrated excellent reusability potential with desorption greater than 90% throughout three consecutive adsorption-desorption cycles. Both sorbents also conformed to Langmuir isotherm and pseudo-second order kinetic model. Immobilized bentonite is therefore recommended for use in water treatments to remove Cu(II) without clogging the system.
authors.affiliation: School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 46150 Petaling Jaya, Selangor, Malaysia.
authors.forename: Wei Shang
authors.initials: WS
authors.lastname: Tan
authors.affiliation: School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 46150 Petaling Jaya, Selangor, Malaysia. Electronic address: adeline.ting@monash.edu.
authors.forename: Adeline Su Yien
authors.initials: AS
authors.lastname: Ting
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry*; D003198:Computer Simulation; D003300:Copper / Q000302:isolation & purification*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D059027:Recycling; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D014874:Water Pollutants, Chemical; D001546:Bentonite; D003300:Copper; D020723:Glucuronic Acid
keywords: Alginate; Bentonite; Cu(II) adsorption; Desorption; Immobilization