Unfortunately, imidazole-based ionic liquids (ILs) tend to build high-boiling impurities like chromophores. This results in reduced process stability and product conditions like stained cellulose fibers. Therefore, different adsorbent materials were tested for their capability to purify the IL 1-ethyl-3-methylimidazolium acetate. The product quality was monitored by UV-vis spectroscopy. It was observed that activated carbon showed the best purification results. The purified IL was successfully reused in the process of cellulose dissolution and shaping.