Passos Camila G, Ribaski Fernanda S, Simon Nathália M, dos Santos Araci A, Vaghetti Júlio C P, Benvenutti Edilson V, Lima Eder Cláudio
Instituto de Química - Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Caixa Postal 15003, CEP 91501-970, Porto Alegre-RS, Brazil.
J Colloid Interface Sci. 2006 Oct 15;302(2):396-407. doi: 10.1016/j.jcis.2006.06.052. Epub 2006 Aug 22.
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.
制备了7-胺基-4-氮杂庚基硅胶（AAH Si）和10-胺基-4-氮杂癸基硅胶（AAD Si），并用于从水溶液中去除铜（II）、铅（II）和铁（III）。采用具有两个伪中心点的全2(3)析因设计，以实现吸附剂对金属离子吸附的间歇吸附过程的最佳条件。为了继续优化，还采用了中心复合表面设计。这两种独立的统计实验设计得出以下条件：吸附剂质量m = 30.0 mg；铜（II）和铅（II）的pH值为6.0，铁（III）的pH值为4.0；接触时间t为180分钟，以确保在较高吸附质浓度下达到平衡。在优化条件后，获得了吸附在AAH Si和AAD Si吸附剂上的金属离子的等温线，并将其拟合到非线性朗缪尔和弗伦德利希等温线模型。
