Shah Irfan, Adnan Rohana, Wan Ngah Wan Saime, Mohamed Norita
School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
PLoS One. 2015 Apr 7;10(4):e0122603. doi: 10.1371/journal.pone.0122603. eCollection 2015.
In this study, iron impregnated activated carbon (FeAC) was synthesized following an oxidation and iron impregnation of activated carbon (AC). Both the AC and FeAC were characterized by pHZPC and FTIR spectroscopy. The removal of Methylene Blue (MB) by AC and FeAC was examined under various experimental conditions. The FeAC showed up to 95% (higher than AC) MB removal in the pH range of 7-10. Although the reaction kinetics was pseudo-second order, the overall rate was controlled by a number of processes such as film diffusion, pore diffusion and intraparticle diffusion. The activation energy values for the MB uptake by AC and FeAC (21.79 and 14.82 kJ/mol, respectively) revealed a physisorption process. In the regeneration study, FeAC has shown consistently ≥ 90% MB removal even up to 10 repeated cycles. The reusable characteristic of the spent FeAC improved the practical use of activated carbon and can be a breakthrough for continuous flow system applications where it can work effectively without any significant reduction in its performance.
在本研究中，通过对活性炭（AC）进行氧化和铁浸渍来合成铁浸渍活性炭（FeAC）。AC和FeAC均通过零电荷点（pHZPC）和傅里叶变换红外光谱（FTIR）进行表征。在各种实验条件下考察了AC和FeAC对亚甲基蓝（MB）的去除效果。FeAC在pH值为7 - 10的范围内对MB的去除率高达95%（高于AC）。尽管反应动力学为拟二级反应，但总体速率受多种过程控制，如膜扩散、孔扩散和颗粒内扩散。AC和FeAC对MB吸附的活化能值（分别为21.79和14.82 kJ/mol）表明这是一个物理吸附过程。在再生研究中，FeAC即使经过10次重复循环仍始终表现出≥90%的MB去除率。废FeAC的可重复使用特性提高了活性炭的实际应用价值，对于连续流系统应用而言可能是一个突破，因为它可以有效运行且性能无显著下降。
