title: Organoarsenic resistance and bioremoval of Acidithiobacillus ferrooxidans.
abstract: The tolerance and bioremoval of dimethylarsinic acid (DMA(V)) by Acidithiobacillus ferrooxidans (A. ferrooxidans) were investigated here. The inhibitory concentration (IC) of DMA(V) was determined for A. ferrooxidans. The effects of various parameters such as pH, contact time, initial DMA(V) concentration, biosorbent dose and temperature were systematically examined to study the biosorption processes. Results indicated that Langmuir model fitted better than Freundlich model to the equilibrium data. Analysis of kinetic data showed that the biosorption processes of DMA(V) involved pseudo-second-order kinetics. Thermodynamic analysis showed that the biosorption of DMA(V) onto A. ferrooxidans was feasible, spontaneous, endothermic and chemisorptive under examined conditions. Fourier transform infrared spectroscopy (FTIR) showed the involvement of -OH, -NH and -SO(3) groups in the biosorption process.
authors.affiliation: MOE Key Laboratory of Arid and Grassland Ecology, School of Life Sciences, Lanzhou University, Lanzhou, PR China. hekouyanlei@gmail.com
authors.forename: Lei
authors.initials: L
authors.lastname: Yan
authors.forename: Huanhuan
authors.initials: H
authors.lastname: Yin
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhang
authors.forename: Jiangong
authors.initials: J
authors.lastname: Duan
authors.forename: Yongquan
authors.initials: Y
authors.lastname: Li
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.forename: Hongyu
authors.initials: H
authors.lastname: Li
mesh_terms: D042763:Acidithiobacillus / Q000378:metabolism*; D001151:Arsenic / Q000378:metabolism / Q000494:pharmacology*; D001673:Biodegradation, Environmental; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009942:Organometallic Compounds / Q000378:metabolism / Q000494:pharmacology*; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics
chemical_list: D009942:Organometallic Compounds; D001151:Arsenic