Effects of periodate oxidation on cellulose polymorphs

Siller, Martin; Amer, Hassan; Bacher, Markus; Roggenstein, Walter; Rosenau, Thomas; Potthast, Antje

doi:10.1007/s10570-015-0648-5

Cited by 86 publications

(60 citation statements)

References 53 publications

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“…A linear dependence was observed from the semilogarithmic plot of concentration over time, showing that the kinetics of cellulose oxidation to a low DO followed a pseudo‐first‐order rate law with respect to periodate concentration (see the Supporting Information). We observed the same kinetic model in a recent study in which the oxidation of cellulose to a DO of 50 % was monitored at RT over a longer reaction time …”

Section: Resultssupporting

confidence: 72%

“…Regardless of the change in pH, recycling of periodate evidently has to be carried out separately from cellulose oxidation to prevent side reactions of the polymer with the secondary oxidation agent, for example, cellulose degradation or further oxidation of aldehydes to carboxyl groups. Recycling of per iodate with ozone also allows the preparation of DAC of various degrees of oxidation by using higher periodate concentrations . In our study, we evaluated the regeneration of per iodate up to 100 m m solutions of iodate.…”

Section: Resultsmentioning

confidence: 99%

“…After removing excess water by filtration with a Büchner funnel, the water content of the cellulosic pulp was approximately 50 % wt. The wet cellulose was immersed in a solution of sodium periodate (0.26 g) to a total volume of 120 mL and was oxidized at 55 °C to a DO of 2 %, according to a method reported previously . Aliquots were taken every 10 min to monitor both periodate consumption and iodate formation, by measuring their absorbance at λ =290 nm after ion separation on a reversed‐phase column.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2016

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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.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

et al. 2016

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“…The chemical structure of DAC gives the material a high functionality, which provides many possibilities for follow‐up chemistry. DAC is obtained by selective oxidation of cellulose repeating units by periodate ions, which cause cleavage of the C2−C3 bonds and the formation of aldehyde groups at these positions . The dialdehyde groups form reversibly intra‐ and intermolecular hemiacetal and hemialdal bonds, as well as hydrates, and are thereby “masked”.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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“…[36] Thus, it is necessary to modify the surface of the HNT particles to enhance their hydrophobicity. [40,41] The peak at 1635 cm −1 is due to the adsorbed/ absorbed moisture. It is critical that the silanization layer fully encapsulates the HNT, specially covering the sides and, thus, sealing the ends of the hollow tube.…”

Section: Introductionmentioning

confidence: 99%

Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics

Patil

2019

Advanced Sustainable Systems

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This paper presents a sustainable biomimetic approach to create ultrahydrophobic cotton fabrics. Cotton fabrics are modified using biobased raw materials to create multiple scale roughness and low surface energy on their surfaces. Naturally occurring halloysite nanotubes (HNT) are modified by silanization and direct assembly of silica (SiO2) nanospheres on the surface of HNTs. HNTs “decorated” with SiO2 nanospheres are covalently bonded onto the surface of cotton fabrics, creating a durable multiple scale surface roughness. Surface modified cotton fabrics are further grafted with fatty acid without using any solvent, via esterification. The combination of the hierarchical roughness pattern created on the surface through modified HNT, and fatty acid treatment results in ultrahydrophobic fabrics with water contact angles (WCAs) above 150°. Surface topographies of modified HNT particles and chemical changes are fully characterized. Attenuated total reflectance Fourier‐transform infrared and WCA studies are used to confirm the grafting of modified HNT particles and aliphatic fatty chains on surface of fabrics. The ultrahydrophobic cotton fabrics washed for five standard laundry cycles (25 home washings) show that the ultrahydrophobicity is durable. Moreover, the ultrahydrophobic fabrics are oleophilic, making them suitable for use in oil–water separation, anti‐biofouling and packaging, and other applications apart from water repellent clothing.

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Effects of periodate oxidation on cellulose polymorphs

Cited by 86 publications

References 53 publications

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

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

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

Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics

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