Depolymerization of cellulose using a 2,2,6,6-tetra methylpiperidine-1-oxygen radical (TEMPO)-mediated electrochemical oxidation process

LI Huan,CHEN YongMei1,LI GaiYun2,LIU Jia1,WAN PingYu

Journal of Beijing University of Chemical Technology ›› 2015, Vol. 42 ›› Issue (6) : 42-49.

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Journal of Beijing University of Chemical Technology ›› 2015, Vol. 42 ›› Issue (6) : 42-49.

Depolymerization of cellulose using a 2,2,6,6-tetra methylpiperidine-1-oxygen radical (TEMPO)-mediated electrochemical oxidation process

  • LI Huan1,CHEN YongMei1,LI GaiYun2,LIU Jia1,WAN PingYu1
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Abstract

The effects of varying the reaction conditions in the depolymerization of microcrystalline cellulose (MCC) through indirect electrooxidization with 2,2,6,6-tetra methylpiperidine-1-oxygen radicals (TEMPO) as mediator have been studied. At (25±5) ℃, 60 g/L MCC in an electrolyte containing 0.2 mol/L Na2CO3-NaHCO3 (pH=10.0) and 1.5 g/L TEMPO was potentiostatically electrolized at 0.80 V (vs. Ag/AgCl) using a graphite anode. The results showed that many carboxyl groups were introduced into MCC, and 55% of MCC was depolymerized into water-soluble oligoes, nano-sized cellulose, cellobiose and glucose when the amount of the introduced carboxyl groups reached 2.0 mmol/g. The depolymerization yield was as high as 82% after subsequent hydrolysis in a hydrothermal kettle, while the yield was less than 1% if MCC was not pretreated by the electrochemical method. 

Key words

cellulose / 2,2,6,6-tetra methylpiperidine-1-oxygen radicals (TEMPO) / electrochemical oxidation / depolymerization

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LI Huan,CHEN YongMei1,LI GaiYun2,LIU Jia1,WAN PingYu. Depolymerization of cellulose using a 2,2,6,6-tetra methylpiperidine-1-oxygen radical (TEMPO)-mediated electrochemical oxidation process[J]. Journal of Beijing University of Chemical Technology, 2015, 42(6): 42-49

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