title: Adsorption Capability of Cationic Dyes (Methylene Blue and Crystal Violet) onto Poly-γ-glutamic Acid.
abstract: In this study, the adsorption capability of cationic dyes, which were methylene blue and crystal violet, by poly-γ-glutamic acid (PGA) in a single or binary solution system was investigated. The effect of the molecular weight of PGA, initial dye concentration, solution pH, and temperature on the adsorption of dyes was evaluated. The adsorption mechanism of dyes onto PGA was the interaction between -COOH group on the PGA surface and the polarity groups of dyes. These results indicated that PGA is useful for removal of dyes and cationic organic compounds from a single or binary solution system.
authors.affiliation: Faculty of Pharmacy, Kindai University.
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Ogata
authors.forename: Noriaki
authors.initials: N
authors.lastname: Nagai
authors.forename: Naohito
authors.initials: N
authors.lastname: Kawasaki
mesh_terms: D000327:Adsorption; D002412:Cations / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D005840:Gentian Violet / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008751:Methylene Blue / Q000737:chemistry*; D011099:Polyglutamic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature
chemical_list: D002412:Cations; D004396:Coloring Agents; C511775:poly(gamma-glutamic acid); D011099:Polyglutamic Acid; D005840:Gentian Violet; D008751:Methylene Blue