title: A simple method to prepare magnetic modified beer yeast and its application for cationic dye adsorption.
abstract: The purpose of this research is to use a simple method to prepare magnetic modified biomass with good adsorption performances for cationic ions. The magnetic modified biomass was prepared by two steps: (1) preparation of pyromellitic dianhydride (PMDA) modified biomass in N, N-dimethylacetamide solution and (2) preparation of magnetic PMDA modified biomass by a situ co-precipitation method under the assistance of ultrasound irradiation in ammonia water. The adsorption potential of the as-prepared magnetic modified biomass was analyzed by using cationic dyes: methylene blue and basic magenta as model dyes. Optical micrograph and x-ray diffraction analyses showed that Fe(3)O(4) particles were precipitated on the modified biomass surface. The as-prepared biosorbent could be recycled easily by using an applied magnetic field. Titration analysis showed that the total concentration of the functional groups on the magnetic PMDA modified biomass was calculated to be 0.75 mmol g(-1) by using the first derivative method. The adsorption capacities (q(m)) of the magnetic PMDA modified biomass for methylene blue and basic magenta were 609.0 and 520.9 mg g(-1), respectively, according to the Langmuir equation. Kinetics experiment showed that adsorption could be completed within 150 min for both dyes. The desorption experiment showed that the magnetic sorbent could be used repeatedly after regeneration. The as-prepared magnetic modified sorbent had a potential in the dyeing industry wastewater treatment.
authors.affiliation: Hubei Novel Reactor & Green Chemical Technology Key Laboratory, Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430074, China.
authors.forename: Jun-Xia
authors.initials: JX
authors.lastname: Yu
authors.forename: Li-Yan
authors.initials: LY
authors.lastname: Wang
authors.forename: Ru-An
authors.initials: RA
authors.lastname: Chi
authors.forename: Yue-Fei
authors.initials: YF
authors.lastname: Zhang
authors.forename: Zhi-Gao
authors.initials: ZG
authors.lastname: Xu
authors.forename: Jia
authors.initials: J
authors.lastname: Guo
mesh_terms: D000327:Adsorption; D001515:Beer; D001565:Benzoates / Q000378:metabolism; D001673:Biodegradation, Environmental; D002412:Cations / Q000032:analysis / Q000378:metabolism; D004396:Coloring Agents / Q000032:analysis / Q000378:metabolism*; D008280:Magnetics; D008751:Methylene Blue; D012394:Rosaniline Dyes / Q000032:analysis / Q000378:metabolism; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*; D015003:Yeasts / Q000254:growth & development / Q000378:metabolism*
chemical_list: D001565:Benzoates; D002412:Cations; D004396:Coloring Agents; D012394:Rosaniline Dyes; C012019:pyromellitic dianhydride; C025485:basic fuchsin; D008751:Methylene Blue