Gupta Arvind, Ladino Camila Reyes, Mekonnen Tizazu H
Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada.
Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada; Institute of Polymer Research, University of Waterloo, Waterloo, ON, Canada; Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON, Canada.
Int J Biol Macromol. 2023 Apr 15;234:123523. doi: 10.1016/j.ijbiomac.2023.123523. Epub 2023 Feb 15.
There is a dire need to find an efficient, cost-effective, sustainable, and environment-friendly adsorbent for the removal of anionic pollutants such as dyes from waste effluent. In this work, a cellulose-based cationic adsorbent was designed and utilized for methyl orange and reactive black 5 anionic dyes adsorption from an aqueous medium. Solid-state nuclear magnetic resonance spectroscopy (NMR) revealed the successful modification of cellulose fibers, and dynamic light scattering (DLS) evaluations showed the levels of charge densities. Furthermore, various models for adsorption equilibrium isotherm were utilized to understand the adsorbent characteristics, with the Freundlich isotherm model providing an excellent fit for the experimental results. The modelled maximum adsorption capacity was as much as 1010 mg/g for both model dyes. The dye adsorption was also confirmed using EDX. It was noted that the dyes were chemically adsorbed through the ionic interaction that can be reversed using sodium chloride solution. Overall, the cationized cellulose is inexpensive, environment-friendly, nature-driven, and recyclable making it an appealing adsorbent feasible for the dye removal from textile wastewater effluent.
迫切需要找到一种高效、经济高效、可持续且环境友好的吸附剂，用于去除废水流出物中的阴离子污染物，如染料。在这项工作中，设计并利用了一种基于纤维素的阳离子吸附剂，用于从水性介质中吸附甲基橙和活性黑5阴离子染料。固态核磁共振光谱（NMR）揭示了纤维素纤维的成功改性，动态光散射（DLS）评估显示了电荷密度水平。此外，利用各种吸附平衡等温线模型来了解吸附剂特性，Freundlich等温线模型与实验结果拟合良好。两种模型染料的模拟最大吸附容量高达1010 mg/g。还用能谱仪（EDX）证实了染料吸附。值得注意的是，染料通过离子相互作用进行化学吸附，这种相互作用可以用氯化钠溶液逆转。总体而言，阳离子化纤维素价格低廉、环境友好、天然且可回收，使其成为一种有吸引力的吸附剂，可用于从纺织废水流出物中去除染料。
