Alcântara Edésio F C, Faria Elaine A, Rodrigues Deyse V, Evangelista Sheila M, DeOliveira Edimar, Zara Luiz F, Rabelo Denílson, Prado Alexandre G S
Instituto de Química, Universidade Federal de Goiás, Caixa Postal 131, 74001-970 Goiânia, Goiás, Brazil.
J Colloid Interface Sci. 2007 Jul 1;311(1):1-7. doi: 10.1016/j.jcis.2007.02.075. Epub 2007 Apr 9.
The compound 2-mercaptobenzimidazole (MBI) was attached onto a silica gel surface by homogeneous and heterogeneous routes. Both silica modification methodologies resulted in similar products, named SiM(hom) and SiM(het), respectively. These materials were characterized by surface area, infrared, thermogravimetry, and 13C and 29Si NMR spectroscopy. The ability of these materials to remove divalent mercury from aqueous solution was followed by a series of adsorption isotherms adjusted to a modified Langmuir equation. The maximum number of moles adsorbed was determined to be 1.35+/-0.3 and 1.42+/-0.17 mmolg-1 for SiMhet and SiMhomt, respectively. These interactions were calorimetrically followed and the thermodynamic data showed the following exothermic enthalpic values: -23.04+/-1.4 and -20.08+/-1.2 kJmol-1 for SiMhom and SiMhet, respectively. All liquid/solid interface adsorptions were spontaneous in nature and enthalpically driven.
通过均相和非均相途径将化合物2-巯基苯并咪唑（MBI）附着到硅胶表面。两种硅胶改性方法均得到了类似的产物，分别命名为SiM(hom)和SiM(het)。这些材料通过比表面积、红外光谱、热重分析以及13C和29Si核磁共振光谱进行了表征。通过一系列根据修正的朗缪尔方程拟合的吸附等温线来跟踪这些材料从水溶液中去除二价汞的能力。对于SiMhet和SiMhomt，确定的最大吸附摩尔数分别为1.35±0.3和1.42±0.17 mmol g-1。通过量热法跟踪这些相互作用，热力学数据显示出以下放热焓值：对于SiMhom和SiMhet，分别为-23.04±1.4和-20.08±1.2 kJ mol-1。所有液/固界面吸附本质上都是自发的且由焓驱动。
