Fine Chemicals Prepared By Bamboo Lignin Degradation Through Electrocatalytic Redox Between Pb/PbO₂ Anode And Cu Cathode In Alkali Solution

Electrochemical degradation of bamboo lignin through electrocatalytic redox between Pb/PbO₂ anode prepared by electrodeposition and Cu cathode in alkaline solution was investigated in this work.The average molecular weight and element content of bamboo lignin were determined by gel permeation chromatography?GPC?and elemental analysis instrument,respectively.Electrochemical performance of the electrode system was analyzed by cyclic voltammetry and cathodic polarization to validate that Pb/PbO₂ and Cu electrodes had a great ability of electrocatalytic oxidation and electrocatalytic reduction in bamboo lignin alkali solution.The organic degradation products in the acidified electrolyte were extracted by organic solvents after electrocatalytic degradation and then the products were qualitatively determined using a gas chromatography-mass spectrometry?GC-MS?and a gas chromatography?GC?.Through the electrocatalytic redox in the process,24 kinds of products were detected by GC-MS and three of them?vanillin,syringaldehyde and p-coumaric acid?were quantitatively detected with high yields by GC with internal standard method.The raw material and the unreacted bamboo lignin residue were comparatively characterized with fourier transform infrared spectoscopy?FT-IR?.The mechanism about degradation of bamboo lignin through electrocatalytic redox was explored.To find the optimum degradation conditions for the maximum yields of vanillin,syringaldehyde and p-coumaric acid,the operating parameters,i.e.,concentration of NaOH solution,pH of the bamboo lignin solution,reaction temperature,bamboo lignin concentration and current density were also investigated.