Cestari Antonio R, Vieira Eunice F S, Vieira Gláucia S, Almeida Luis E
Laboratory of Materials and Calorimetry, Departamento de Química/CCET, Universidade Federal de Sergipe, CEP 49100-000 São Cristóvão, Sergipe, Brazil.
J Hazard Mater. 2006 Nov 2;138(1):133-41. doi: 10.1016/j.jhazmat.2006.05.046. Epub 2006 May 22.
In this study, the aminopropyl-silica (Sil-NH(2)) was used to adsorb a yellow- and a red-dye from aqueous solutions at pH 4.0. New data concerning the influence of the anionic surfactant SDS on the adsorption data was obtained. All interactions occurred below the cmc values of the Sil-NH(2)/anionic dyes aggregates. A rise of temperature accelerates the mass transfer of the red-dye into the Sil-NH(2) surface, while the yellow-dye adsorption decreased. The presence of SDS increased the adsorption quantities in relation to the temperature increasing. The exception is observed for the yellow-dye adsorption at 55 degrees C. So, it is suggested that the chemical structure of the dye, as well as the presence and position of its sulfonate groups are important factors that affect the anionic dye/SDS aggregations and the adsorption quantities. The solid-phase interactions of dyes data present good fittings to the Avrami kinetic model, where from two to four kinetic regions were found, taking into account the variations of the contact time and temperature. The presence of several values of Avrami constants, namely k(Av) and n, has been attributed to the occupation of both the surface and the internal adsorption sites of the aminopropyl-silica.
在本研究中，使用氨丙基二氧化硅（Sil-NH₂）在pH 4.0条件下从水溶液中吸附一种黄色染料和一种红色染料。获得了关于阴离子表面活性剂十二烷基硫酸钠（SDS）对吸附数据影响的新数据。所有相互作用均发生在Sil-NH₂/阴离子染料聚集体的临界胶束浓度值以下。温度升高会加速红色染料向Sil-NH₂表面的传质，而黄色染料的吸附量则下降。SDS的存在使吸附量随温度升高而增加。在55℃下黄色染料的吸附情况是个例外。因此，表明染料的化学结构及其磺酸根基团的存在和位置是影响阴离子染料/SDS聚集体和吸附量的重要因素。染料的固-相相互作用数据与Avrami动力学模型拟合良好，考虑到接触时间和温度的变化，发现了两到四个动力学区域。Avrami常数k(Av)和n存在多个值，这归因于氨丙基二氧化硅的表面和内部吸附位点均被占据。
