Adam Mickiewicz University in Poznań, Faculty of Chemistry, Umultowska 89b, 61-614 Poznań, Poland.
National Research Centre, Physical Chemistry Department, 33 El Bohouth Street (former Tahrir st.), Dokki, P.O. 12622, Giza, Egypt.
J Colloid Interface Sci. 2017 Nov 1;505:593-604. doi: 10.1016/j.jcis.2017.06.052. Epub 2017 Jun 19.
Mesoporous carbon of cubic structure was functionalized with ethylamine, ethylenediamine, diethylenetriamine and triethylenetetramine at 40°C for 8h. The mesostructure and textural parameters of the new materials were determined by X-ray diffraction and low-temperature nitrogen sorption techniques. The functional groups present on the surface of the samples were identified by FT-IR and thermogravimetric studies. Functionalization of the mesoporous carbon led to reduction of the surface area and pore volume as well as to an increase in the mean pore diameter. The micropores/small mesopores can be blocked by the attached surface amino groups. We found that after functionalization the mesostructural regularity was still maintained. A key element of the study was a series of adsorption tests of solophenyl red 3BL polyazo dye onto amine-functionalized mesoporous carbons from aqueous solutions. The influence of the process time, concentration of adsorbate, pH and temperature on the efficiency of the adsorption process was analyzed. The samples modified with amine groups were found to show much higher sorption capacities towards solophenyl red 3BL than pure carbon. It is a results of formation of a large number of positive surface sites that interact with anionic adsorbate. The adsorption kinetics was found to follow closely the pseudo-second-order kinetic model. The results of the intraparticle diffusion model suggested that intraparticle diffusion was not the only one rate-controlling step. The adsorption of the dye was a spontaneous and endothermic process.
采用乙胺、乙二胺、二乙烯三胺和三乙烯四胺在 40°C 下对立方结构的介孔碳进行功能化 8 小时。采用 X 射线衍射和低温氮吸附技术对新材料的介孔结构和结构参数进行了测定。通过傅里叶变换红外光谱和热重研究确定了样品表面存在的官能团。介孔碳的功能化导致比表面积和孔体积减少，平均孔径增大。微孔/小介孔可能被附着的表面氨基基团阻塞。我们发现，功能化后介孔结构的规则性仍然保持。研究的一个关键要素是一系列从水溶液中吸附单偶氮苯红 3BL 染料到胺功能化介孔碳的吸附实验。分析了过程时间、吸附物浓度、pH 和温度对吸附过程效率的影响。发现经过胺基修饰的样品对单偶氮苯红 3BL 的吸附容量比纯碳高得多。这是因为形成了大量与阴离子吸附物相互作用的正表面位。吸附动力学非常符合伪二阶动力学模型。内扩散模型的结果表明，内扩散不是唯一的速率控制步骤。染料的吸附是一个自发的吸热过程。
