title: Application of mesoporous SBA-15 silica functionalized with 4-amino-2-mercaptopyrimidine for the adsorption of Cu(II), Zn(II), Cd(II), Ni(II), and Pb(II) from water.
abstract: This work reports the sol-gel synthesis of a SBA-15 silica, and its functionalization with 4-amino-2-mercaptopyrimidine to perform adsorption of metal species from aqueous media. The functionalization of the material was confirmed by FTIR and superficial area measurements. The final material was tested through batch experiments to uncover its adsorptive properties towards the adsorption of Cu(II), Cd(II), Zn(II), Pb(II) and Ni(II). Contact time and pH conditions were investigated, and the material presented slow adsorption kinetics, which was best described by the pseudo-second order model. In addition, at pH 5 - 6, the adsorption of the metal ions was favored. Under optimized conditions, the material had its maximum adsorption capacities determined for all metal species studied, and the obtained values were 13.0 µmol g(-1) for Zn(II), 12.3 µmol g(-1) for Cu(II), 3.45 µmol g(-1) for Ni(II), 2.45 µmol g(-1) for Pb(II) and 0.60 µmol g(-1) for Cd(II). The capacity differences between each metal ion were discussed in terms of their ionic radii and Person's soft/hard acids/bases concept.
authors.forename: Alexandre de Oliveira
authors.initials: Ade O
authors.lastname: Jorgetto
authors.forename: Silvana Pontes
authors.initials: SP
authors.lastname: Pereira
authors.forename: Rafael Innocenti Vieira da
authors.initials: RI
authors.lastname: Silva
authors.forename: Margarida Juri
authors.initials: MJ
authors.lastname: Saeki
authors.forename: Marco Antonio Utrera
authors.initials: MA
authors.lastname: Martines
authors.forename: Valber de Albuquerque
authors.initials: Vde A
authors.lastname: Pedrosa
authors.forename: Gustavo Rocha de
authors.initials: GR
authors.lastname: Castro
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry; D007854:Lead / Q000737:chemistry; D009532:Nickel / Q000737:chemistry; D010316:Particle Size; D016062:Porosity; D011743:Pyrimidines / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry
chemical_list: C505203:4-amino-2-mercaptopyrimidine; D011743:Pyrimidines; C509969:SBA-15; D013438:Sulfhydryl Compounds; D014867:Water; D007854:Lead; D012822:Silicon Dioxide; D003300:Copper; D009532:Nickel; D015032:Zinc