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

Abstract

Oxidation of cellulose with periodate under aqueous conditions yields dialdehyde cellulose, a promising functional cellulose derivative. The main obstacles for this oxidation have been its slow kinetics and the dilute reaction conditions, requiring considerable amounts of water and energy. In this study, these drawbacks are overcome by conducting the oxidation at high cellulosic pulp consistency with a cellulose/water weight ratio of 1:4. The oxidizer, cellulose, and water are efficiently mixed in a ball mill. Oxidation occurs mostly in the subsequent step, during the resting time (no further milling/mixing is required). The reaction and resource efficiency of the process are optimized by experimental design and a maximum aldehyde content of 8 mmol g−1 is obtained with a periodate/cellulose molar ratio of 1.25, a milling time of 2 min, and a resting time of 8 h. The developed method allows fine tuning of the oxidation level and is a key step towards the sustainable periodate oxidation of cellulose also on larger scale.

A green method for preparation of amino acids functionalized 2,3-dialdehyde cellulose

“…The hydroxylamine hydrochloride reacts with aldehyde group to generate hydrochloric acid. The aldehyde content of oxidized DAC can be determined by sodium hydroxide titration of the released hydrochloric acid [22].…”

Hydrogel-Forming Algae Polysaccharides: From Seaweed to Biomedical Applications

“… 269 Recently, it was shown that the resource efficiency of the periodate oxidation can be tremendously increased by reaction at high solid content. 207 In the case of cellulose, these oxidized groups can be postmodified to give access to CNF decorated with various functional groups, including, among others, carboxylate and sulfonate ones. 270 , 271 Sulfated polysaccharides can be made using sulfur trioxide pyridine, yielding a polysaccharide substituted with sulfate groups ( Figure 4 C).…”

Selective separation of Cu(II) from a single metal ion solution by using O-amino thiophenol-modified flax fiber

“…Chemical modifications is very significant as it enhances the cellulose adsorption capacity and the ability for removing heavy metals from aqueous media Chemical modification of cellulose maybe done by using acids, organic compounds, bases or minerals. [27][28][29]. The oxidation of the cellulose by a selective oxidizing agent like periodate is very important as the resultant dialdehyde cellulose has great ability to be modified with many functional groups as aliphatic or aromatic amines.…”