title: Poly(amic acid)-modified biomass of baker's yeast for enhancement adsorption of methylene blue and basic magenta.
abstract: In this study, poly(amic acid)-modified biomass was prepared to improve the adsorption capacities for two cationic dyes, methylene blue and basic magenta. X-ray photoelectron spectroscopy and potentiometric titration demonstrated that a large number of imide, amine, and carboxyl groups were introduced on the biomass surface, and the concentrations of these functional groups were calculated to be 0.27, 1.08, and 1.08 mmol g(-1) by using the first derivative method. According to the Langmuir equation, the maximum uptake capacities (q(m)) for methylene blue and basic magenta were 680.3 and 353.4 mg g(-1), respectively, which were 13- and sevenfold than that obtained on the unmodified biomass. Adsorption kinetics study showed that the completion of the adsorption process needed only 40 min, which is faster than the common sorbent such as activated carbon and resin. Experimental results showed that pH and ionic strength had little effect on the capacity of the modified biomass, indicating that the modified biomass had good potential for practical use.
authors.affiliation: Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430074, China. yujunxia_1979@yahoo.com.cn
authors.forename: Jun-xia
authors.initials: JX
authors.lastname: Yu
authors.forename: Bu-hai
authors.initials: BH
authors.lastname: Li
authors.forename: Xiao-mei
authors.initials: XM
authors.lastname: Sun
authors.forename: Jun
authors.initials: J
authors.lastname: Yuan
authors.forename: Ru-an
authors.initials: RA
authors.lastname: Chi
mesh_terms: D000327:Adsorption; D001555:Benzene Derivatives / Q000737:chemistry / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018533:Biomass; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry / Q000302:isolation & purification*; D009994:Osmolar Concentration; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000737:chemistry / Q000378:metabolism*; D011199:Potentiometry; D012394:Rosaniline Dyes / Q000737:chemistry / Q000302:isolation & purification*; D012441:Saccharomyces cerevisiae / Q000378:metabolism* / Q000648:ultrastructure; D013696:Temperature
chemical_list: D001555:Benzene Derivatives; D011108:Polymers; D012394:Rosaniline Dyes; C513053:polyamic acid; C025485:basic fuchsin; D008751:Methylene Blue