title: Nickel(II) biosorption by Rhodotorula glutinis.
abstract: The present study reports the feasibility of using Rhodotorula glutinis biomass as an alternative low-cost biosorbent to remove Ni(II) ions from aqueous solutions. Acetone-pretreated R. glutinis cells showed higher Ni(II) biosorption capacity than untreated cells at pH values ranging from 3 to 7.5, with an optimum pH of 7.5. The effects of other relevant environmental parameters, such as initial Ni(II) concentration, shaking contact time and temperature, on Ni(II) biosorption onto acetone-pretreated R. glutinis were evaluated. Significant enhancement of Ni(II) biosorption capacity was observed by increasing initial metal concentration and temperature. Kinetic studies showed that the kinetic data were best described by a pseudo-second-order kinetic model. Among the two-, three-, and four-parameter isotherm models tested, the Fritz-Schluender model exhibited the best fit to experimental data. Thermodynamic parameters (activation energy, and changes in activation enthalpy, activation entropy, and free energy of activation) revealed that the biosorption of Ni(II) ions onto acetone-pretreated R. glutinis biomass is an endothermic and non-spontaneous process, involving chemical sorption with weak interactions between the biosorbent and Ni(II) ions. The high sorption capacity (44.45 mg g(-1) at 25°C, and 63.53 mg g(-1) at 70°C) exhibited by acetone-pretreated R. glutinis biomass places this biosorbent among the best adsorbents currently available for removal of Ni(II) ions from aqueous effluents.
authors.affiliation: Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, Mexico, DF, 11340, Mexico.
authors.forename: Alicia
authors.initials: A
authors.lastname: Suazo-Madrid
authors.forename: Liliana
authors.initials: L
authors.lastname: Morales-Barrera
authors.forename: Erick
authors.initials: E
authors.lastname: Aranda-García
authors.forename: Eliseo
authors.initials: E
authors.lastname: Cristiani-Urbina
mesh_terms: D000327:Adsorption; D018533:Biomass; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D009532:Nickel / Q000302:isolation & purification*; D012248:Rhodotorula / Q000378:metabolism*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D009532:Nickel
references.citation: Biometals. 2003 Dec;16(4):567-81
references.pmid: 12779242
references.citation: Water Res. 2005 May;39(10):2167-77
references.pmid: 15927227
references.citation: Biotechnol Adv. 2009 Mar-Apr;27(2):195-226
references.pmid: 19103274
references.citation: Appl Biochem Biotechnol. 2010 Mar;160(5):1540-56
references.pmid: 19404780
references.citation: J Hazard Mater. 2008 Oct 1;158(1):100-6
references.pmid: 18313216
references.citation: Appl Microbiol Biotechnol. 1997 Sep;48(3):373-8
references.pmid: 9352679
references.citation: J Hazard Mater. 2009 Mar 15;162(2-3):616-45
references.pmid: 18656309
references.citation: J Hazard Mater. 2007 Oct 1;149(1):35-41
references.pmid: 17467899
references.citation: J Hazard Mater. 2009 May 15;164(1):172-81
references.pmid: 18809255
references.citation: J Hazard Mater. 2007 Jul 16;145(3):501-5
references.pmid: 17289258
references.citation: Colloids Surf B Biointerfaces. 2009 Nov 1;74(1):260-5
references.pmid: 19716275
references.citation: Water Res. 2005 Jun;39(11):2273-80
references.pmid: 15941575
references.citation: Bioresour Technol. 2008 May;99(7):2281-7
references.pmid: 17587568
references.citation: Environ Sci Technol. 2001 Nov 1;35(21):4283-8
references.pmid: 11718343
references.citation: Guang Pu Xue Yu Guang Pu Fen Xi. 2009 May;29(5):1218-21
references.pmid: 19650457
references.citation: J Hazard Mater. 2007 Aug 17;147(1-2):518-23
references.pmid: 17320284
references.citation: Int J Environ Res Public Health. 2007 Dec;4(4):332-9
references.pmid: 18180544
references.citation: Bioprocess Biosyst Eng. 2003 Mar;25(5):271-7
references.pmid: 14505170
references.citation: Biochem Eng J. 2000 Oct 1;6(2):145-151
references.pmid: 10959085
references.citation: Rev Environ Health. 1996 Oct-Dec;11(4):167-73
references.pmid: 9085432
references.citation: J Hazard Mater. 2006 Sep 21;137(2):899-908
references.pmid: 16621254
references.citation: Bioresour Technol. 2007 Feb;98(3):595-601
references.pmid: 16631364
references.citation: J Hazard Mater. 2003 Jun 27;100(1-3):219-29
references.pmid: 12835024
references.citation: Z Naturforsch C J Biosci. 2002 Jul-Aug;57(7-8):634-9
references.pmid: 12240989