title: The characteristics of waste Saccharomyces cerevisiae biosorption of arsenic(III).
abstract: OBJECTIVE
  The potential of using waste Saccharomyces cerevisiae as adsorbent for the adsorption of As(III) from aqueous solution was assessed.
  
  
  METHODS
  The biosorbent was characterized by Fourier transform infrared (FTIR) spectroscopy analysis. Various parameters including pH, biosorbent dosage, contact time, and temperature were systematically investigated.
  
  
  CONCLUSIONS
  The FTIR results of S. cerevisiae biomass showed that biomass has different functional groups, and these functional groups are able to react with metal ion in aqueous solution. Several biosorption isotherms were used to fit the equilibrium data, showing sorption to be monolayer on the heterogeneous surface of the biosorbent. The maximum biosorption capacity calculated using Langmuir model was found to be 62.908 μg/g at pH 5.0, biosorbent dosage 5 g/L, contact time 240 min, and temperature 35 °C. The kinetic studies indicated that the biosorption process of the As(III) followed well the pseudo-second-order equation. The intraparticle diffusion and Richenberg models were applied to the data, and we found that the biosorption of As(III) was governed by film diffusion followed by intraparticle diffusion. The thermodynamics constants indicated that the biosorption of As(III) onto S. cerevisiae was spontaneous and endothermic under examined conditions. Biosorbent could be regenerated using 0.5 M NaOH solution, with up to 75 % recovery.
authors.affiliation: Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China.
authors.forename: Yunhai
authors.initials: Y
authors.lastname: Wu
authors.forename: Yajun
authors.initials: Y
authors.lastname: Wen
authors.forename: Jianxin
authors.initials: J
authors.lastname: Zhou
authors.forename: Qi
authors.initials: Q
authors.lastname: Dai
authors.forename: Yunying
authors.initials: Y
authors.lastname: Wu
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000378:metabolism*; D001515:Beer; D007220:Industrial Waste; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D001151:Arsenic