title: Use of statistical design of experiments to evaluate the sorption capacity of 7-amine-4-azaheptylsilica and 10-amine- 4-azadecylsilica for Cu(II), Pb(II), and Fe(III) adsorption.
abstract: 7-Amine-4-azaheptylsilica (AAH Si) and 10-amine-4-azadecylsilica (AAD Si) were prepared and used for removal of Cu(II), Pb(II), and Fe(III) from aqueous solutions. Full 2(3) factorial designs with two pseudo-central points were carried out in order to achieve the best conditions of the batch adsorption procedure for metallic ion uptake by the adsorbents. To continue the optimizations, central composite surface design was also employed. These two independent statistical designs of experiments lead to the following conditions: m=30.0 mg of adsorbent; pH 6.0 for Cu(II) and Pb(II), pH 4.0 for Fe(III); t of contact 180 min to guarantee equilibration at higher adsorbate concentration. After optimization of the conditions, isotherms of the metallic ions adsorbed on the AAH Si and AAD Si adsorbents were obtained, which were fitted to nonlinear Langmuir and Freundlich isotherm models.
authors.affiliation: Instituto de Química - Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Caixa Postal 15003, CEP 91501-970, Porto Alegre-RS, Brazil.
authors.forename: Camila G
authors.initials: CG
authors.lastname: Passos
authors.forename: Fernanda S
authors.initials: FS
authors.lastname: Ribaski
authors.forename: Nathália M
authors.initials: NM
authors.lastname: Simon
authors.forename: Araci A
authors.initials: AA
authors.lastname: dos Santos
authors.forename: Júlio C P
authors.initials: JC
authors.lastname: Vaghetti
authors.forename: Edilson V
authors.initials: EV
authors.lastname: Benvenutti
authors.forename: Eder Cláudio
authors.initials: EC
authors.lastname: Lima
mesh_terms: D000327:Adsorption; D000588:Amines / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D017646:Organosilicon Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010316:Particle Size; D012107:Research Design / Q000706:statistics & numerical data*; D013499:Surface Properties
chemical_list: C520115:10-amine-4-azadecylsilica; C520114:7-amine-4-azaheptylsilica; D000588:Amines; D017646:Organosilicon Compounds; D007854:Lead; D003300:Copper; D007501:Iron