Someda H H
Nuclear Chemistry Department, Hot Laboratories Center, Atomic Energy Authority, Post Code 13759 Cairo, Egypt.
J Hazard Mater. 2007 Oct 1;149(1):189-98. doi: 10.1016/j.jhazmat.2007.03.068. Epub 2007 Mar 25.
Theonyltrifluoroacetone (TTA) mixed with trioctyl phosphine oxide (TOPO) have been supported on Amberlite XAD-4, silica gel and wood powder. The resulting resins have been used to study the sorption of cobalt(II) from acetate buffer and their sorption capacities were determined and were found to be 12.38, 11.61 and 6.51 mg g(-1) for TTA+TOPO/Amberlite XAD4, TTA+TOPO/silica gel and TTA+TOPO/wood, respectively. The experimental results showed that the sorption of Co(II) increases with its initial concentration. The results can be fitted by Freundlich isotherm in the studied cobalt concentration range [10(-4)-10(-3) M] and 1/n values are 1.07, 1.17 and 1.73 for Amberlite XAD4, silica gel and wood powder, respectively. The sorption of Co(II) onto the prepared resins was found to follow the pseudo-second order model and the sorption rate have the values 8.79x10(-3), 10x10(-3) and 16x10(-3) g mg(-1)min(-1) for Amberlite XAD4, silica gel and wood powder, respectively. Thermodynamic parameters have also been calculated for the three systems and sorption process was found to be spontaneous and endothermic one.
噻吩甲酰三氟丙酮（TTA）与三辛基氧化膦（TOPO）的混合物已负载于Amberlite XAD - 4、硅胶和木粉上。所得树脂用于研究从醋酸盐缓冲液中吸附钴（II）的情况，并测定了它们的吸附容量，结果发现TTA + TOPO/Amberlite XAD4、TTA + TOPO/硅胶和TTA + TOPO/木材的吸附容量分别为12.38、11.61和6.51 mg g⁻¹。实验结果表明，Co（II）的吸附量随其初始浓度的增加而增加。在研究的钴浓度范围[10⁻⁴ - 10⁻³ M]内，结果可以用Freundlich等温线拟合，Amberlite XAD4、硅胶和木粉的1/n值分别为1.07、1.17和1.73。发现Co（II）在制备的树脂上的吸附遵循准二级模型，Amberlite XAD4、硅胶和木粉的吸附速率分别为8.79×10⁻³、10×10⁻³和16×10⁻³ g mg⁻¹ min⁻¹。还计算了这三个体系的热力学参数，发现吸附过程是自发的且为吸热过程。
