Department of Chemistry, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 44000, Pakistan.
Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 44000, Pakistan.
Environ Sci Pollut Res Int. 2018 Nov;25(32):32112-32121. doi: 10.1007/s11356-018-3135-3. Epub 2018 Sep 14.
In this study, the uptake of hydrophobic bromide-based ionic liquids (ILs) (imidazolium, pyrrolidinium, and pyridinium) from aqueous solutions onto granulated and fabric-based microporous activated carbons (ACs). Surface characterization study shows that both ACs have basic pHpzc, like 8.7 for granulated AC and 8.0 for fabric AC. Granulated AC have ten times higher phenolic groups 0.2 meq g compared to fabric AC which is 0.03 meq g. The kinetics of adsorption was remarkably slower for ILs on granulated/fabric AC than milled one. We also studied the effect of AC size on the rate of adsorption in the operating conditions. In order to improve the adsorption kinetics of ILs with ACs, different phenomenological and empirical kinetic models like as pseudo-first order, Boyd model, pseudo-second-order diffusion model and Elovich were applied on the kinetic experimental data. The analysis of kinetic specified that the adsorption mechanism of ILs onto ACs is controlled mainly by the mass transfer through the pores of ACs. So, the selection of appropriate adsorbent particle size of AC plays a main role for the development of viable IL adsorption. Graphical abstract ᅟ.
在这项研究中，从水溶液中摄取疏水性溴基离子液体（ILs）（咪唑鎓、吡咯烷鎓和吡啶鎓）到颗粒状和基于织物的微孔活性炭（AC）上。表面特性研究表明，两种 AC 均具有碱性 pHpzc，如颗粒状 AC 的 8.7 和织物 AC 的 8.0。颗粒状 AC 上的酚基比织物 AC 高十倍，分别为 0.2 meq g 和 0.03 meq g。与磨碎的 AC 相比，IL 在颗粒状/织物 AC 上的吸附动力学明显较慢。我们还研究了 AC 粒径对操作条件下吸附速率的影响。为了改善 AC 对 ILs 的吸附动力学，将不同的唯象和经验动力学模型（如伪一级、Boyd 模型、伪二级扩散模型和 Elovich）应用于动力学实验数据。动力学分析表明，ILs 在 AC 上的吸附机理主要受 AC 孔隙内的质量传递控制。因此，选择合适的 AC 吸附剂颗粒尺寸对于开发可行的 IL 吸附至关重要。
