title: Thermodynamics and kinetic studies of biosorption of a basic dye from aqueous solution using green algae Ulothrix sp.
abstract: This study addresses removal of a basic dye, methylene blue, from aqueous solutions by using dried Ulothrix sp. biomass as biosorbent. The effects of the initial dye concentration, contact time, temperature, solution equilibrium pH, biosorbent dosage, and mixing rate on biosorption of the dye have been investigated. It was found that 30min is sufficient in order to reach adsorption equilibrium. The amount of methylene blue adsorbed onto Ulothrix sp. increased with increasing equilibrium pH and mixing rate, in contrary, it decreased with increasing temperature and sorbent dosage. The process followed the pseudo-second-order kinetic model. The isosteric enthalpy and entropy values were calculated as -11.8kJ/mol and 37.5J/(molK), respectively. In addition, the results suggest that the physical interactions between sorbent particles and sorbate ions play an important role for the adsorption of methylene blue onto the biosorbent.
authors: Erzincan University, Education Faculty, Department of Science Education, Erzincan, Turkey.
authors: Cetin
authors: C
authors: Doğar
authors: Ahmet
authors: A
authors: Gürses
authors: Metin
authors: M
authors: Açikyildiz
authors: Esra
authors: E
authors: Ozkan
mesh_terms: D000042:Absorption; D000460:Chlorophyta; D004396:Coloring Agents / Q000737:chemistry*; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D015394:Molecular Structure; D012996:Solutions; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods
chemical_list: D004396:Coloring Agents; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D008751:Methylene Blue