Regeneration of Aqueous Periodate Solutions by Ozone Treatment: A Sustainable Approach for Dialdehyde Cellulose Production

Abstract

A method for easy and fast regeneration of aqueous periodate solutions from dialdehyde cellulose (DAC) production by ozone treatment is presented, along with a direct and reliable simultaneous quantification of iodate and periodate by reversed-phase HPLC. The influence of iodate and ozone concentration, solution pH, and reaction time on the regeneration efficiency was studied, as well as the reaction kinetics. Regeneration of spent periodate solutions by ozone was successfully performed in alkaline medium, which favors the formation of free (.) OH radicals, as supported by the addition of radical scavengers and quantum mechanical calculations. At pH 13 and an ozone concentration of approximately 150 mg L(-1) , periodate was completely regenerated from a 100 mm solution of iodate within 1 h at room temperature. A cyclic process of cellulose oxidation and subsequent regeneration of spent periodate with 90 % efficiency has been developed. So far, commercial applications of DAC have been hampered by difficulties in reusing the costly periodate. This work overcomes this hurdle and presents a highly efficient, clean, and low-cost protocol for the preparation of DAC with integrated periodate recycling, with the possibility of scaling the process up.

Structure Selectivity of Alkaline Periodate Oxidation on Lignocellulose for Facile Isolation of Cellulose Nanocrystals

“…We showcase the processes with five cycles by using O 3 gas to regenerate periodate ions, primarily from iodate ions that were formed during the oxidation (Figure A). In particular, the alkaline conditions proved to be most beneficial for a high conversion efficiency of iodate into periodate . Briefly, the supernatant transparent solutions, after the separation of the total solids, were treated with O 3 gas for at least 1 hour after 14 days of reaction.…”

Ambient‐Dried, 3D‐Printable and Electrically Conducting Cellulose Nanofiber Aerogels by Inclusion of Functional Polymers

“…Thanks to the absence of critical point drying and freeze‐drying, this process could presumably be fairly easily made continuous and meet industrial requirements both in terms of energy consumption and production rate. However, this preparation procedure requires sodium metaperiodate, whose efficient handling and recovery is still economically and practically challenging …”

“…However, this preparation procedure requires sodium metaperiodate, whose efficient handling and recovery is still economically and practically challenging. [42,43] Algal polysaccharides have recently shown great promise in the preparation of wet-stable cellulosic networks. [44,45] Due to their chemical similarity, algal polysaccharides and CNFs can assemble into double networks.…”

Resource‐Saving Production of Dialdehyde Cellulose: Optimization of the Process at High Pulp Consistency

“…Much less water for washing is required. The consumed sodium periodate can be recycled efficiently, according to our previously reported environmentally compatible process with ozone instead of chlorine‐based oxidants, which increases the overall sustainability of the process.…”