School of Geographic Sciences, Henan Key Laboratory for Synergistic Prevention of Water and Soil Environmental Pollution, Xinyang Normal University, Xinyang 464000, China.
Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
J Colloid Interface Sci. 2021 May 15;590:396-406. doi: 10.1016/j.jcis.2021.01.073. Epub 2021 Feb 1.
The presence and accumulation of dyestuff in the environment is posing great harm to human beings. In this study, a novel poly(pyrrole methane) (PPm) adsorbent with abundant OH was greenly synthesized via a facile polymerization method. Its physicochemical properties were characterized in detail. Furthermore, the adsorption performance of PPm for anionic dye (acid red G, ARG) and cationic dye (methylene blue, MB) was comparatively studied with a typical dye adsorbent (polyprrrole, PPy). The results revealed that the adsorption of ARG or MB onto PPm followed pseudo-second-order model and Langmuir mode. The adsorption processes were endothermic and spontaneous. The maximum capacities of PPm to adsorb ARG and MB were 555.56 mg/g and 99.11 mg/g, which were about 10 and 2 times higher than that of PPy, respectively. PPm could be reused for 5 cycles without a significant decrease of its adsorption rate. The adsorption of ARG and MB is mainly attributed to electrostatic interaction and hydrogen bonding between ARG or MB and OH in PPm. Additionally, ARG could be adsorbed by ion exchange with the doped Cl in PPm. Therefore, this study provides a new strategy to synthesis efficient adsorbent for the removal of both anionic and cationic dyes.
染料在环境中的存在和积累对人类造成了极大的危害。在本研究中，通过一种简便的聚合方法绿色合成了具有丰富 OH 的新型聚（甲烷吡咯）（PPm）吸附剂。详细表征了其物理化学性质。此外，还比较研究了典型染料吸附剂（聚吡咯，PPy）对阴离子染料（酸性红 G，ARG）和阳离子染料（亚甲蓝，MB）的吸附性能。结果表明，ARG 或 MB 在 PPm 上的吸附符合拟二级动力学模型和 Langmuir 模式。吸附过程是吸热和自发的。PPm 对 ARG 和 MB 的最大吸附容量分别为 555.56mg/g 和 99.11mg/g，分别是 PPy 的 10 倍和 2 倍。PPm 可以重复使用 5 次而其吸附速率没有明显下降。ARG 和 MB 的吸附主要归因于 ARG 或 MB 与 PPm 中 OH 之间的静电相互作用和氢键。此外，ARG 可以通过与 PPm 中掺杂的 Cl 进行离子交换而被吸附。因此，本研究为去除阴离子和阳离子染料提供了一种合成高效吸附剂的新策略。
