Grupo de Química de Materiais e Tecnologias Sustentáveis (GQMATS), Universidade Tecnológica Federal do Paraná (UTFPR), Londrina, Brazil.
Departamento de Química, Universidade Estadual de Londrina (UEL), Londrina, Brazil.
Environ Technol. 2022 Jun;43(15):2278-2289. doi: 10.1080/09593330.2021.1871662. Epub 2021 Jan 11.
This work proposes a novel technology for environmental remediation based on mesoporous silica spheres, which were successfully synthesized by the solvothermal method using the cetyltrimethylammonium bromide as a structuring agent. The adsorbent was designed to remove cationic dyes at strong acidic conditions. The surface was modified by a careful thermal treatment aiming at the condensation of silanol to siloxane groups. The adsorbent was characterized by XRD, SEM, FTIR, N adsorption/desorption and the equilibrium technique to determine the pH. The kinetic of the adsorption followed a pseudo-second-order model and the process was ruled by physical forces. The isotherms were fitted to Freundlich and Temkin models, indicating that the physisorption occurred with multilayer formation, with the interaction adsorbate-adsorbate being relevant to the whole process. The adsorption capacity was approximately 60 mg g and the adsorbents performance in the fast-contact system showed removal of 65%wt. of a 93 mg L methylene blue (MB) solution in a single application.
本工作提出了一种基于介孔硅球的新型环境修复技术，该技术通过溶剂热法成功合成，使用十六烷基三甲基溴化铵作为结构导向剂。该吸附剂旨在强酸性条件下去除阳离子染料。通过仔细的热处理对表面进行改性，旨在缩合硅醇成硅氧烷基团。通过 XRD、SEM、FTIR、N 吸附/解吸和平衡技术对吸附剂进行了表征，以确定 pH 值。吸附动力学遵循拟二级模型，该过程受物理力控制。等温线拟合为 Freundlich 和 Temkin 模型，表明物理吸附伴随着多层形成，吸附物-吸附物的相互作用与整个过程有关。吸附容量约为 60mg/g，在快速接触系统中，该吸附剂在单次应用中可去除 93mg/L 亚甲基蓝（MB）溶液中 65%wt 的物质。
