Modification of Hydrolysis Lignin by Hydrogen Peroxide to Obtain an Effective Adsorbent of Highly Toxic Rocket Fuel

Abstract

Lignin, a large scale by-product of papermaking and bioethanol production, is applied now in various fields. One of the main areas of use is in the development of different adsorbents, including those intended for detoxification of the spills of 1,1-dimethylhydrazine-based rocket fuel. The present work has shown the possibility of oxidative modification of hydrolytic lignin by hydrogen peroxide to improve the efficiency of the adsorbent. The change in functional composition of the modified adsorbent was studied by IR and NMR spectroscopy. It was shown that the oxidative treatment led to an increase in the content of carbonyl and carboxyl groups, which act as the active adsorption centres for hydrazine molecules. The optimum oxidation conditions were found. An increase in treatment duration from 15 to 120 min and in concentration of hydrogen peroxide from 6 to 30% did not have a significant effect on the functional composition and adsorption properties of lignin.

Valorization of Lignin via Oxidative Depolymerization with Hydrogen Peroxide: Towards Carboxyl-Rich Oligomeric Lignin Fragments

“…This change was also observed by He et al [23]. According to Kozhenikov et al [46], another indication of successful oxidation of KL with H 2 O 2 is given by an increasing intensity of the weak band at 1700 cm −1 in the OKL, which is associated with carbonyl/carboxyl stretch vibrations. However, in contrast to He et al [23], under the applied reaction conditions in this work, aromatic cleavage was not observed, as no change of intensity of the aromatic skeleton vibrations at 1600 cm −1 , 1500 cm −1 , and 1417 cm −1 was observed for OKL compared to KL.…”